CN102736553A - Method for realizing virtual machine tool model-based cloud terminal numerical control system and virtual machine tool model-based cloud terminal numerical control system - Google Patents

Abstract

The invention discloses a method and system for implementing a cloud numerical control system based on a virtual machine tool model. The method establishes a corresponding virtual machine tool model module for each lower computer of a numerical control device, and the virtual machine tool model module includes basic parameters of the machine tool and the data system ; Use the cloud server, that is, the remote server to complete the human-computer interaction, input and preprocessing of the NC machining program, and the decoding of the NC machining program; the cloud server communicates with the lower computer of the NC device through the network. The system includes a cloud host computer responsible for the preprocessing of the NC machining program and the decoding of the NC machining program, the lower computer of the CNC device, and at least one virtual machine tool model module for storing the basic parameters of the machine tool and the data system; the lower computer communicates with the Cloud host computer communication to control the speed and position of the machine tool. The invention can greatly reduce the cost of production enterprises, and at the same time provide a comfortable working environment for machine tool operators.

Description

A method and system for implementing a cloud numerical control system based on a virtual machine tool model

technical field

The invention belongs to the technical field of numerical control systems, and in particular relates to a method for realizing a cloud numerical control system based on a virtual machine tool model, so as to realize the goal that the numerical control system provides cloud computing services to numerical control machine tools.

Background technique

CNC machine tool is an efficient and automatic machine tool, which consists of two parts: the machine tool body and the CNC system. The machine tool body is mainly composed of basic parts such as bed, column, worktable, guide rail and other supporting parts such as tool magazine and tool holder. For the convenience of description, the machine tool body is referred to as machine tool for short below. The numerical control system is a program control system, including numerical control device, drive, motor (motor), where the numerical control device includes man-machine interface, parameter setting, code input device, interpreter, motion planner, axis motion controller, and additional Value-added software and other modules. Accompanying drawing 1 is the frame diagram of general numerical control system at present, and accompanying drawing 1 also marks the main module in the numerical control device. The human-machine interface module is responsible for the interaction between the user and the NC device. The parameter setting module is used to set the parameters of the NC device during operation. The code input device is mainly responsible for the input of NC machining programs, control parameters, and compensation data. The program segment of the processing program is decoded, the motion planner mainly completes the speed processing and interpolation calculation, the axis motion controller is mainly responsible for the position control, and the value-added software is some software modules that realize additional functions, such as the simulation of the tool path, etc. .

Cloud computing is a kind of information technology. Cloud computing provides computing and data services remotely through the network, and the client does not need to know the source of the remote services. At present, the use of cloud computing in workshops is still in its infancy, and it focuses on remote monitoring and data services for CNC systems and machine tools. In terms of the architecture design of the workshop cloud computing, the current method is to bind the CNC system and the machine tool into the same unit in the cloud architecture. In other words, the CNC system and the machine tool are not connected through the cloud architecture, as shown in Figure 2. The cloud architecture mentioned here refers to the modules that implement cloud computing. The CNC system using cloud computing technology is called cloud CNC system, and the organizational structure of cloud CNC system is called cloud CNC architecture.

In recent years, a new type of CNC system architecture has become popular, as shown in Figure 3. This CNC system architecture splits the CNC device into an upper computer and a lower computer; the lower computer includes a motion planner and axis motion controller related to real-time operations, and other modules are placed on the upper computer. In the current CNC system architecture, the upper computer and the lower computer are installed next to the machine tool, and the upper and lower computers are connected by a bus.

Whether it is the traditional stand-alone structure or the recently popular upper and lower computer structures, they all face the same business challenge: how to improve performance while reducing costs. Especially in recent years, the calculation function of the numerical control system has become more and more complex, which makes the requirements for the core and memory of the numerical control device higher and higher, resulting in the pressure of rising costs. Another related problem: These complex functions are difficult and wasteful for machine operators to operate effectively in the noisy, chaotic environment of the shop floor.

Currently, two network data transmission protocols commonly used in workshops are MTConnect and NCUC-Bus. The formulation unit of MTConnect is the MTConnect Institute supported by AMT (American Manufacturing Association), and the first version was released in 2009. The MTConnect protocol is based on HTTP (on top of TCP/IP) and XML, supports cloud computing services for intranet and extranet, and provides a data model for general workshop applications. The NCUC-Bus fieldbus protocol specification is formulated by the China Machine Tool Industry Federation, and the first version has just been submitted to the government for approval. Its protocol is based on fieldbus, mainly for the peripheral application and short-distance application of a single machine tool, such as the communication between the CNC upper computer and the lower computer. NCUC-Bus only serves raw data and does not provide a data model.

Contents of the invention

The purpose of the present invention is to provide a method and system for implementing a cloud numerical control system based on a virtual machine tool model. The present invention can greatly reduce the cost of a production enterprise, and at the same time provide a comfortable working environment for machine tool operators.

A method for implementing a cloud numerical control system based on a virtual machine tool model provided by the present invention is characterized in that the method establishes a corresponding virtual machine tool model module for each lower computer of a numerical control device, and the virtual machine tool model module includes machine tools and data systems. Basic parameters; use the cloud server, that is, the remote server to complete human-computer interaction, input and preprocessing of the NC machining program, and decode the NC machining program; the cloud server communicates with the lower computer of the NC device through the network.

A cloud numerical control system based on a virtual machine tool model provided by the present invention includes an upper computer and a lower computer of a numerical control device. It is characterized in that the system includes at least one virtual machine tool model module, and the virtual machine tool model module is used to store information about machine tools and data systems. Basic parameters; the upper computer is a cloud upper computer; the number of the numerical control device lower computer and the virtual machine tool model module is the same, and each virtual machine tool model module corresponds to a numerical control device lower computer; the data device lower computer communicates with the cloud through the network Upper computer communication;

The cloud host computer is mainly responsible for the preprocessing of the CNC machining program and the decoding of the CNC machining program; the cloud host computer loads the corresponding virtual machine tool model data of the CNC machine tool, sets the operating parameters, and completes the preprocessing and compilation of the machining program, and Provide control data including speed and position data to the lower computer of the numerical control device;

The lower computer of the data device receives the control data provided by the cloud upper computer through the network, and controls the speed and position of the machine tool.

As an improvement of the above technical solution, a human-machine interface module of a host computer is arranged in the cloud host computer.

As a further improvement of the above technical solution, the cloud host computer is connected to at least one client through a network or directly, and the client is used to complete human-computer interaction functions and input of NC machining programs.

As a further improvement of the above technical solution, the system also includes at least one local host computer, the local host computer communicates with the cloud host computer through the network, and the local host computer is used to complete the human-computer interaction function and the input of the CNC machining program , and send it to the cloud host computer through the network; the local host computer also receives the control data provided by the cloud host computer through the network, and transfers it to the lower computer of the numerical control device.

As a further improvement of the above technical solution, in the communication process between the local host computer and the cloud host computer, first the local host computer transmits an instruction to the cloud host computer via the network; then the cloud host computer performs calculations according to the instructions to obtain images or/and graphics Data; finally, the cloud host computer sends the image or/and graphics data processed in the previous cycle back to the local host computer via the network.

The present invention will use two network data transmission protocols MTConnect and NCUC-Bus commonly used in the workshop, and adopt cloud computing technology to solve the problems existing in the prior art. The key is to move the main part of the numerical control device to the cloud, and use cloud computing technology to Reduce devices, reduce costs, and at the same time transfer the man-machine interface to a more favorable operating environment, and give full play to many high-end functions of the CNC system.

Description of drawings

Fig. 1 is the structure diagram of numerical control system and machine tool structure;

Figure 2 is a schematic diagram of the current workshop cloud architecture, including CNC systems and machine tools;

Fig. 3 is a structural schematic diagram of the upper and lower computers of the numerical control device;

Fig. 4 is a schematic diagram of a service-type cloud numerical control architecture in which a cloud host computer is configured with two lower computers provided by an example of the present invention;

Fig. 5 is an implementation diagram of a service-type cloud numerical control architecture in which a cloud host computer is configured with two slave computers provided by an example of the present invention;

Fig. 6 is a schematic diagram of a service-type cloud numerical control architecture of a separate client provided by an example of the present invention;

Fig. 7 is a schematic diagram of a local cloud numerical control architecture in which a cloud host computer is configured with two local upper and lower computers provided by an example of the present invention;

Fig. 8 is an implementation diagram of a local cloud numerical control architecture provided by an example of the present invention in which a cloud host computer is configured with two local upper and lower computers.

FIG. 9 is a sequence diagram of each data exchange cycle in the immediate caching technology.

FIG. 10 is a sequence diagram of two data exchange cycles in the immediate caching technology.

Detailed ways

In the present invention, the upper computer can be located not only in the cloud server, but also near the machine tool, or coexist, that is, there can be an upper computer on the cloud server and near the machine tool. For clarity, the host computer located on the cloud server (that is, the remote server) is called the cloud host computer, and the host computer located near the machine tool is called the local host computer.

In the existing numerical control system, the upper computer and the lower computer are connected together or through an internal bus, and the upper computer and the lower computer are in a one-to-one correspondence. In the numerical control system of the present invention, a cloud host computer can correspond to multiple slave computers through an open network, or a cloud host computer can correspond to multiple local host computers through the network. Both modes greatly save costs and improve operation. The environment provides the conditions.

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The first mode provided by the example of the present invention is to move the entire upper computer to a remote server to form a cloud upper computer, which is connected to the lower computer and the machine tool via the network, as shown in Figure 4. For the convenience of description, this mode is called service cloud numerical control. Under the architecture of service-type cloud numerical control, one upper computer can connect several lower computers, so as to avoid the configuration of one upper computer for each machine tool, and achieve the purpose of equipment sharing and cost reduction. Another advantage of this model is that the cloud host computer can be placed in an excellent working environment away from the workshop to facilitate the operation of high-end functions.

The service-type cloud CNC architecture can be partially modified, specifically: the human-machine interface in the cloud host computer is separated and placed on the client, as shown in Figure 6. There can be more than one separate client, and the client can also be any computer device, including a desktop computer, a notebook, a tablet computer, a PDA, and the like.

When the working situation requires the operator to operate beside the machine tool, the local (beside the machine tool) upper computer can be reserved to provide the man-machine interface and parameter setting functions related to the operation, and at the same time move the rest of the modules to the cloud, as shown in Figure 7 shown. For the convenience of description, this mode is called local cloud numerical control. Under the framework of the local cloud CNC, the operator feels no different from the traditional CNC, the only difference is that the internal calculations are all completed on the cloud host computer. The cloud host computer does not require a man-machine interface, so it is covered in Figure 7, but it can also be loaded if necessary.

The ultimate goal of the cloud CNC architecture is to use one CNC cloud host computer to serve multiple machine tools. This architecture will face a technical difficulty: on the one hand, the characteristics and functions of each machine tool are different, while the traditional CNC system is designed to serve a single machine tool. In other words, the debugging and setting of the CNC system is only for a single machine tool. If you want to implement a cloud host computer to serve multiple machine tools, you must break through this technical bottleneck in design.

Aiming at the above problems, the solution proposed by the present invention is to establish a virtual machine tool model. The main idea of this solution is to establish a model corresponding to data related to the machine tool (including parameters of characteristics and functions) to form an independent virtual machine tool model. Each machine tool has a corresponding virtual machine tool model, and this data model is stored in the form of files or databases, and placed on any media or devices connected to the network. When the numerical control system starts to operate a certain machine tool, it reads relevant data from the virtual machine tool model corresponding to the machine tool, and makes corresponding debugging and settings for the parameters of the numerical control system.

In the framework of the numerical control system of the present invention, the virtual machine tool model will replace the original parameter setting module. At present, the debugging and setting work of the numerical control system is completed by manually inputting operating parameters and storing them in the numerical control system, which has a low degree of automation. These CNC system parameters and machine tool parameters directly define and describe the functions of the CNC machine tool. If the parameters and function data of the machine tool are available, the required CNC system parameters can also be derived from them. The present invention eliminates the manual parameter setting step and replaces it with a virtual machine tool model reading module, which is responsible for reading in the parameters and functional data models corresponding to the machine tool, and setting the parameters of the numerical control system according to the model.

The main content of the virtual machine tool model is the kinematic chain, geometric model, dynamic model of the machine tool, as well as the unique functions and operation requirements of the machine tool. The specific content of the virtual machine tool model can be increased or decreased according to the functions and requirements of the CNC system. The virtual machine tool model described in the present invention is essentially a database including the basic parameters of the machine tool and the numerical control system.

There is also a potential problem in the cloud CNC architecture, that is, the speed of data exchange between the cloud host computer and the local host computer via the network. Generally speaking, the bandwidth of the current commercial local area network should be more than enough to cope with the data exchange related to CNC. The only possible problem is the exchange of real-time image or graphic data. The mode of real-time image or graphic data exchange is usually "client-pull", that is, the local host computer (client) actively obtains data from the cloud host computer (server). In client pull mode, each cycle consists of the following three steps:

(1) The local host computer sends an instruction to the cloud host computer via the network.

(2) The host computer in the cloud does calculations and prepares image/graphic data.

(3) The cloud host computer sends the data back to the local host computer via the network.

In order to increase the speed, the present invention adopts a server-side instant cache solution. The core method of this solution is that after the instructions transmitted by the local host computer arrive at the cloud host computer, instead of waiting for the processing process of the cloud host computer, the data processed in the previous cycle are sent back to the local host computer (while the data of this cycle waits for return in the next cycle). Therefore, each cycle reduces the waiting time of step (2).

The following uses the virtual machine tool model and the server-side real-time cache to explain the implementation methods of the service-type and local-type cloud CNC architectures. We first describe the realization method of the virtual machine tool model and the real-time cache on the server side, and then explain the service cloud CNC and local cloud CNC architectures respectively (including the position of the virtual machine tool model in the overall architecture).

The process of establishing a virtual machine tool model is: collect the parameters required by the virtual machine tool model, including the basic parameters of the machine tool and the CNC system; serialize the collected parameters, and then store the serialized data in the form of a document or database, Thereby, it is convenient to store, read, modify, set, etc. by computer. Place the established virtual machine tool model (document or database) on any device, which must be able to use input media (such as USB) or the network to communicate with the cloud host computer, so that the cloud host computer can read or modify the virtual machine tool model . Table 1 and Table 2 are the basic parameters of a machine tool and CNC system listed.

As shown in Figure 4, it is a service-type cloud CNC system, which includes a cloud host computer, multiple CNC device slave computers, and multiple virtual machine tool model modules. Here, there is a one-to-one correspondence between the number of lower computers of the numerical control device and the virtual machine tool model, that is, each lower computer of the numerical control device corresponds to one virtual machine tool model, and at least one lower computer of the numerical control device exists.

The cloud host computer is mainly responsible for human-computer interaction, reading of virtual machine tool models, setting of CNC system parameters, input and preprocessing of CNC machining programs, decoding of CNC machining programs, and some additional functions including simulation. The cloud host computer includes a man-machine interface module, a virtual machine model read-in module, an input/preprocessing module, an interpreter and a value-added software module.

The lower computer of the data device communicates with the upper computer of the numerical control device through the network, and it is responsible for speed processing, interpolation calculation and position control and other functions. The lower computer of the data device includes a motion planning module and a motion control module. The functions and interrelationships of these modules are the same as those in the existing numerical control system.

The virtual machine tool model module is used to store the virtual machine tool model. Each virtual machine tool model module corresponds to a machine tool. This module is located on a device connected to the network. The device can be a device in the cloud data system, such as an upper or lower computer, or it can be It is a device outside the system, and communicates with the lower computer of the numerical control device through the network.

Taking Figure 4 as an example, a typical working process of the service cloud CNC system is as follows:

The user starts the CNC system through the cloud host computer and inputs the processing program. The cloud host computer loads the virtual machine tool model data of the corresponding CNC machine tool through the virtual machine model reading module and sets the operating parameters. Next, the cloud host computer completes the processing program. After processing and compiling, the upper computer on the cloud submits the running results to the lower computer of the numerical control device, and the lower computer of the numerical control device controls the motion planner and the axis motion controller according to the passed parameters to complete the processing tasks issued by the user.

The implementation steps of service-type cloud numerical control are as follows:

(1) Realize each module of the cloud host computer (man-machine interface, virtual machine model reading module, code input device, interpreter, and additional value-added software) in the form of software. The implementation in the form of software mentioned here refers to the realization of corresponding modules and their functions through programming languages (which can be any general-purpose computer programming languages such as C, C++, Java, etc.).

(2) Package all the modules of the cloud host computer into a software application. Since the virtual machine tool model reading module is also included in the software application, the software application can read different virtual machine tool models.

(3) Realize the virtual machine tool model in the first step, and specify the location of the virtual machine tool model. The location mentioned here refers to the device for storing the virtual machine tool model.

(4) Use a network device that generally supports the TCP/IP general protocol to connect the cloud upper computer, lower computer, and machine tool to the network. The network can be the Internet or a local area network. Here, the connection between the upper computer and the lower computer in the cloud is realized through network devices, which can be switches, routers, etc.

(6) Use the network transmission protocol to complete the communication between the upper computer and the lower computer in the cloud. The network transmission protocol can be NCUC-Bus or MTConnect protocol, or any custom protocol that is common on TCP/IP.

Figure 5 shows an implementation case of the service-type cloud-based numerical control architecture, which corresponds to the situation where one cloud-based host computer is configured with two lower-position computers. On the upper computer in the cloud, two threads can be generated to run two copies of the upper computer software at the same time, using different virtual machine tool models, corresponding to different lower computers; you can also run the software on the two copies at will (corresponding to the two lower computers) machine) to switch between.

The implementation method of the service-type cloud CNC architecture with separated clients is the same as the above, and its operation process is roughly the same, except that the user's working position may be different. As shown in Figure 6, the following steps are added on the basis of the previous steps:

(1) Transplant the human-machine interface module of the upper computer to the client.

(2) Connect the client computer to the network (intranet or external network), use a network device that generally supports the TCP/IP general protocol; or directly connect to the cloud host computer, and use a short-distance communication medium, such as Bluetooth (Bluetooth ), UPS, etc.

Figure 7 shows another structure: local cloud numerical control. The cloud numerical control system provided by the present invention includes not only a cloud upper computer, multiple numerical control device lower computers, and multiple virtual machine tool model modules, but also multiple local upper computers communicating with the cloud upper computer. The lower computers of the device are in one-to-one correspondence, and the number is equal. The cloud upper computer communicates with the local upper computer through the network, and the local upper computer is connected with the lower computer of the CNC device, and controls the work of the machine tool through it.

The local cloud numerical control system assigns the functions of the upper computer to the cloud upper computer and the local upper computer, and its function division can have different ways. Figure 7 is a thin-client design, in which all the host computer functions are placed on the cloud host computer, while the local host computer only reserves a man-machine interface to face the user.

Taking the thin client design in Figure 7 as an example, a typical working process of the local cloud CNC system is as follows:

The user starts the CNC system through the local host computer and inputs the processing program. The processing program is uploaded from the network to the cloud host computer. The cloud host computer loads the virtual machine tool model data of the corresponding CNC machine tool through the virtual machine model reading module and sets the operating parameters. Next, , the cloud host computer completes the preprocessing and compilation of the processing program, and then transmits the result to the local host computer, and the local host computer then controls the lower computer of the numerical control device according to the transmitted parameters to complete the processing task issued by the user.

The implementation steps of the local cloud CNC architecture are as follows:

(1) Realize each module of the cloud host computer (virtual machine tool model read-in module, code input device, interpreter, and additional value-added software) in the form of software.

(2) Realize the man-machine interface module of the local host computer in the form of software to form a thin-client man-machine interface software application.

(3) Realize the virtual machine tool model of the first step, and specify the location of the virtual machine tool model. The location mentioned here refers to: the device for storing the virtual machine tool model.

(4) Package the virtual machine tool model reading module, code input device, interpreter, and additional value-added software into a server-side software application, and configure this server-side software application to the cloud host computer to become the cloud host computer. a service.

(5) Use a network device that generally supports the TCP/IP general protocol to connect the cloud host computer and the local host computer to the network (intranet or external network).

(6) Use the network transmission protocol to complete the communication between the upper computer and the lower computer in the cloud. The network transmission protocol can be NCUC-Bus or MTConnect protocol, or any custom protocol that is common on TCP/IP.

Figure 8 shows an implementation case of the local cloud CNC architecture, which corresponds to the situation where a cloud host server is configured with two host computers and lower computers. In this case, the virtual machine tool model is stored in the local host computer (actually, it can be stored in any device that can communicate with the cloud host computer). The upper server in the cloud only provides services behind the scenes, and the operator on the local upper computer will not feel its existence.

The local cloud numerical control system designed by the thin client needs to continuously send the graphical interface from the cloud host computer to the local host computer in real time. As mentioned above, this graphic data is pulled by the client. Figure 9 is a sequence diagram of each data exchange cycle, in which sequences 1.1 to 1.3 represent three actions included in a cycle (the same three actions are repeated in each cycle, and are not repeated in the figure).

In order to improve the speed, we propose the implementation method of the immediate buffer. The real-time buffer is installed in the cloud host computer and acts as a proxy for data exchange between the cloud host computer and the network, as shown in Figure 8. Its function is to cache the graphics data of the previous cycle and return it in the next cycle. Figure 10 is a sequence diagram of every two data exchange cycles after including the immediate buffer (cycle repeats, and so on). As shown in the figure, after the first step of each cycle, the graphic data cached in the previous cycle is directly fetched from the real-time buffer, eliminating the waiting time. In the first cycle, if the immediate buffer is empty (not yet cached), no fetches are made.

For example, for a certain type of CNC lathe, its machine tool parameters are shown in Table 1, and its CNC system parameters are shown in Table 2.

Table 1 Machine parameters

Table 2 CNC system parameters

The parameters in Table 1 and Table 2 are collected and classified according to the above, and the virtual machine tool model of this type of CNC lathe is established. It should be noted that Table 1 and Table 2 are only schematic descriptions. There are various machine tools in actual production, but the parameters of each machine tool can be given in the form of Table 1 and Table 2. For each machine tool Each machine tool can establish a corresponding virtual machine tool model.

It is easy for those skilled in the art to understand that the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention, All should be included within the protection scope of the present invention.

Claims (8)

1. A method for implementing a cloud numerical control system based on a virtual machine tool model, characterized in that the method establishes a corresponding virtual machine tool model module for each lower computer of the numerical control device, and the virtual machine tool model module includes basic parameters of the machine tool and the data system ; Use the cloud server, that is, the remote server to complete the human-computer interaction, input and preprocessing of the NC machining program, and the decoding of the NC machining program; the cloud server communicates with the lower computer of the NC device through the network. 2. A cloud numerical control system based on a virtual machine tool model, including a host computer and a numerical control device lower computer, characterized in that the system includes at least one virtual machine tool model module, and the virtual machine tool model module is used to store basic parameters of machine tools and data systems ; The host computer is a cloud host computer; the numerical control device lower computer has the same number as the virtual machine tool model module, and each virtual machine tool model module corresponds to a numerical control device lower computer; the data device lower computer communicates with the cloud upper computer through the network communication; The cloud host computer is mainly responsible for the preprocessing of the CNC machining program and the decoding of the CNC machining program; the cloud host computer loads the corresponding virtual machine tool model data of the CNC machine tool, sets the operating parameters, and completes the preprocessing and compilation of the machining program, and Provide control data including speed and position data to the lower computer of the numerical control device; The lower computer of the data device receives the control data provided by the cloud upper computer through the network, and controls the speed and position of the machine tool. 3. A cloud numerical control system based on a virtual machine tool model according to claim 2, wherein a host computer man-machine interface module is arranged in the cloud host computer. 4. A kind of cloud numerical control system based on virtual machine tool model according to claim 2, it is characterized in that, described cloud host computer is connected or directly connected with at least one client through network, and described client is used for completing man-machine Interactive function, and the input of NC machining program. 5. A cloud numerical control system based on a virtual machine tool model according to claim 2, characterized in that the system also includes at least one local host computer, the local host computer communicates with the cloud host computer through the network, and the local host computer The computer is used to complete the human-computer interaction function and the input of the CNC machining program, and transmit it to the cloud host computer through the network; the local host computer also receives the control data provided by the cloud host computer through the network, and transfers it to the lower computer of the CNC device. 6. The cloud numerical control system based on a virtual machine tool model according to claim 5, wherein, during the communication process between the local host computer and the cloud host computer, first the local host computer transmits an instruction to the cloud host computer via the network; Then the cloud host computer performs calculations according to the instructions to obtain image or/and graphics data; finally, the cloud host computer sends the image or/and graphics data processed in the previous cycle back to the local host computer via the network. 7. A cloud numerical control system based on a virtual machine tool model according to any one of claims 2 to 6, wherein the virtual machine tool model module communicates with the cloud host computer directly or through a network. 8. A cloud numerical control system based on a virtual machine tool model according to any one of claims 2 to 6, characterized in that, between the cloud upper computer and the local upper computer, between the cloud upper computer and the lower computer of the numerical control device through MTConnect protocol or NCUC-Bus protocol for communication.

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