JP4313296B2 - Blank piercing method - Google Patents

Description

The present invention relates to a blank piercing method that uses two types of single-function machines to improve productivity as well as processing accuracy in punching a sheet metal . Specifically, it is a processing method that combines piercing for punching small holes such as rounds and corners in the product outline from sheet metal and blanking for cutting out the outer contours of the product and large holes, etc., and small holes such as product rounds and corners. Piercing processing is performed with a punch press processing machine, and then blank processing is performed with a laser cutting processing machine to cut out the outer peripheral contour and large holes of the product, and as much as possible the deterioration of processing accuracy due to thermal expansion of the workpiece during laser cutting processing The present invention relates to a blank piercing method that employs a blank processing jig to suppress and improve the productivity of a laser cutting machine.

Hole punching contact processing (hereinafter referred to as “punch press processing”) using a die and laser hole cutting as methods for punching the outer peripheral contour of a product, large holes and small holes (hereinafter referred to as blank piercing processing) from sheet metal There is a method of non-contact processing (hereinafter referred to as laser cutting processing).

As shown in FIG. 1, the main part of the punch press machine P has a work 1 placed on a table 7, and the work 1 is moved back and forth (hereinafter referred to as Y-axis direction) and left and right (hereinafter referred to as X-axis direction). And a tool head 3 that moves up and down at high speed and a mold 31 attached to the tool head 3. The advantage of punching with a punch press is that it can be punched by moving the die up and down (hereinafter referred to as the Z-axis direction) at high speed. Further, since the contact processing is performed using a mold, the outer shape continuous notch cutting and the forming molding processing using a molding die are possible. In the case of punch press processing of a small hole, there is an ability to punch and process 60 to 300 holes per minute, and productivity is high. Further, when punching a round hole, the accuracy of the hole diameter depends on the outer diameter accuracy of the mold to be used, and the hole diameter accuracy can be stably maintained. On the other hand, the disadvantage of punch press processing is that a die is used, so that it takes a lot of time to change the die, such as changing or resetting the die for each shape of the property to be processed. Further, when cutting the outer peripheral contour of the product, since the notch is continuously cut in the vertical direction, notch marks are formed on the cut surface. Furthermore, when the punched product is taken out, the machine stops for 4 to 10 seconds, so that productivity is reduced in cutting the outer contour.

FIG. 2 shows a laser cutting machine. The main part of the laser cutting machine R is composed of a laser head 4 and the like on which a workpiece 1 is placed on a table 7 and moves on the table 1 in the X and Y axis directions. The advantage of drilling with a laser cutting machine is that a die is not used, so that the setup time for each property to be processed is short. Moreover, since it is non-contact machining, the workpiece is not deformed and machining accuracy is good. Further, when laser cutting is performed on the outer peripheral contour of a product or a window shape, notch marks are not formed on the cut surface, so that the appearance and accuracy of the cut surface are good. Since the laser cutting machine is usually provided with a workpiece autochanger (not shown), it is not necessary to stop the machine when the workpiece 1 is taken out. The disadvantage is that the laser cutting process is performed by optically scanning the shape of the hole, so that the processing time is increased accordingly. For this reason, it has only the ability to punch 40 holes per minute. Further, small hole processing is easily affected by the composition of the material, and the hole diameter accuracy is poor.

Based on the above, in blank piercing processing, small holes in the outer peripheral contour of the product and the discarded holes necessary before entering the blank processing by laser cutting are processed by punching with a punch press machine, and the outer peripheral contour and outer peripheral contour are processed. It is desirable to apply each of the processing methods that are good at processing the inner large hole by cutting with a laser cutting machine to the hole portion of the product. The above processing is referred to as composite processing, and there are cases where two single-function machines having different functions are used and composite machines having two functions in one machine.

FIG. 3 shows the multifunction machine. The main part of the multi-function machine J is that the work 1 is placed on the table 7 and the work 1 moves in the X and Y axis directions. The tool head 3 and the laser head 4 move up and down at high speed, and a mold 31 attached to the tool head 3. The advantage of blank piercing with a compound machine is that two types of drilling processing heads are provided on one machine, so the machine coordinate origin of each head is the same, and the workpiece can be transferred to the processing table. Just one time.

On the other hand, there are also disadvantages when punching with a multifunction machine. Since there are two types of processing heads in one machine, the laser head is paused during punch press processing, while the tool head of the punch press processing machine is paused during laser cutting. The operating rate of the head is lowered. In addition, when the thickness of the workpiece is an intermediate thickness of about 3.2 to 9.0 mm, when the punch press processing is performed on the entire surface of the workpiece by the tool head, the workpiece is greatly deformed, and then the laser cutting processing is performed by the laser head. However, there is a problem in processing due to accuracy. On the other hand, when laser cutting is performed on the entire surface of the workpiece at once, the position of the hole that has already been pre-punched is shifted from the machine coordinates due to thermal expansion of the workpiece. As a countermeasure against this, as an example, when manufacturing 100 products from a single workpiece in 20 rows in the X-axis direction and 5 rows in the Y-axis direction, first, the tool head in the X-axis direction is equivalent to 20 products. 3 is punch-pressed, and then 20 of them are laser-cut by the laser head 4. These processing combinations are repeated five times. In this way, it is necessary to devise a technique for suppressing the influence of the thermal expansion of the workpiece caused by laser cutting. In this case, if the product has three types of holes, three types of dies are required, and the die is changed three times (5 seconds / time) for drilling 20 holes in the Y-axis direction. It takes 15 seconds per time. Therefore, when processing one piece of work, this is repeated five times, so that a total of 75 seconds is required for die replacement. Furthermore, it takes 4 to 6 seconds per product when taking out the product, and since 100 of these are taken out, a total processing time of 400 to 600 seconds is required for taking out the product. As described above, blank piercing by a multi-function machine requires a great deal of time for mold exchange and product removal, and productivity is deteriorated.

By the way, in laser cutting processing, laser cutting processing is performed based on processing conditions set in advance according to specifications such as workpiece material, plate thickness, and surface treatment. The laser cutting processing conditions include, for example, setting of the laser light oscillation frequency, processing speed, assist gas type, gas pressure, laser light maximum output value, etc., which are incorporated into the processing program, and based on this program, the large hole or outer contour Cutting is performed. In addition, before starting the punching process, the processing reference position of the workpiece is detected using an optoelectronic sensor.

As described above, in the blank processing by the laser cutting machine, when the punching processing close to each other is continued on one workpiece, the heat at the laser cutting processing remains in the cut hole locus portion, and the temperature of the workpiece The next machining is performed in a state in which is raised. For this reason, the workpiece is greatly displaced due to the thermal expansion of the workpiece due to this heat storage, the hole position is shifted, and processing defects occur. Also, if the workpiece material, surface treatment, and thickness change, the reflectivity of the photoelectric sensor's beam will change, so it is necessary to adjust the sensitivity of the photoelectric sensor and the position of the workpiece each time. It took a very long time to set within an error range of minus 5 millimeters.

As described above, blank piercing using a single machine for punch press processing or a single machine for laser cutting and blank piercing using a compound machine have the following problems.

In a single machine for punch press processing, since a die is used, it is necessary to set a die for each shape of an object to be processed, and it takes a lot of time to change the die. Further, when performing blank processing of the outer peripheral contour of the product, the notch mark is formed on the cut surface because the notch is continuously cut in the vertical direction. Further, when removing the blank pierced product, the machine is stopped for 4 to 10 seconds, so that productivity is lowered.

Further, in the laser single-function machine, every time the workpiece specifications such as the material change, it takes time to check the workpiece condition and to obtain the accuracy of the hole, and the operating rate of the laser cutting machine decreases. And the hole processing per unit time is also slow compared with punch press processing.

In addition, when a multi-function machine is employed, a great deal of time is required for mold replacement and product removal, and productivity is poor.

Therefore, the blank piercing method and the blank processing jig according to the present invention have been made in order to solve the above-described conventional problems, and are a single machine for punch press processing and a single machine for laser cutting. By combining the advantages of each, the setting time of the workpiece machining reference position every time the workpiece material, surface treatment, etc. changes, reduces work time and improves productivity, and the product outer contour due to workpiece thermal expansion An object of the present invention is to provide a blank piercing method and a blank processing jig that minimize the positional deviation.

In order to achieve the above object, the invention according to claim 1 is a sheet metal working method in which a piercing process is performed by a punch press machine and then a blank process is performed by a laser cutting machine. And using a laser cutting machine equipped with a processing station, a step of adhering the laser cutting jig to the weighting station and a round pin standing on the laser cutting jig were drilled in the workpiece A work reference hole is fitted, and an elongated round hole drilled in the work is fitted to another round pin standing on the laser cutting jig, and these are then processed from the weighting station by the machining. A blanking process is started from the workpiece part farthest from the workpiece reference hole after being moved to the station. A blank piercing method comprising and.

Here, “blank piercing” in this specification is a combination of piercing for punching a small hole such as a round or square hole provided in the contour of a product from a sheet metal and a blank processing for cutting out the outer peripheral contour of the product. Processing.

In addition, the “photoelectronic sensor” in this specification is a device that detects the amount of deviation of the work position from the mechanical coordinate origin of the laser head, and transmits a red light beam transmitted from an optical fiber through a condenser lens. Focus on the surface of the object. When the beam passes the edge of the object, the shape is determined by measuring the reflection intensity of the beam light. This shape data is taken in, and the deviation amount of the workpiece position from the machine coordinate origin is corrected by NC control. Note that iron, aluminum, and stainless steel are suitable for the workpiece, but ceramics with low reflectivity are not preferred.

Piercing processing such as small holes and disposal holes in the outer peripheral contour of the product is performed by a punch press processing machine, and blank processing of the outer peripheral contour and large holes of the product is performed by a laser cutting processing machine. By providing a hole for measuring the position of a jig with an optoelectronic sensor as a machining jig, it is possible to shorten the time required for troublesome machining reference position and sensitivity setting work each time the specifications of the workpiece such as material change, and improve productivity. Can do. Further, it is possible to prevent the blank processing position of the product outer peripheral contour from being shifted due to the thermal expansion of the workpiece and improve the processing accuracy. That is, by using the advantages of the two types of single-function machines, it is possible to improve the efficiency of press working and the accuracy of laser cutting.

Embodiments of the present invention will be specifically described below based on the embodiments of the present invention illustrated in the accompanying drawings.

First, an embodiment of the present invention will be described with reference to FIGS. 1 and 2 and FIGS. FIG. 1 is an overall plan view of a punch press machine. FIG. 2 is an overall plan view of the laser cutting machine. FIG. 4 is an overall perspective view of the laser cutting machine. FIG. 5 is a perspective view of the laser head. FIG. 6 is a cross-sectional view of the optoelectronic sensor. FIG. 7 is a plan view of the laser cutting jig. FIG. 8 is a plan view showing a state in which a workpiece is set on the laser cutting jig. FIG. 9 is an enlarged view of the vicinity of an oval and a round hole showing the state of thermal expansion of the workpiece. FIG. 10 is a plan view of a product to be blank pierced. FIG. 11 is an arrangement diagram of products on a workpiece to be blank pierced. FIG. 12 is a diagram showing the order of laser cutting processing of products on a workpiece.

As shown in FIG. 1, the main part of the punch press machine P has a workpiece 1 placed on a table 7 and the workpiece 1 moves in the X and Y axis directions together with the table 7. The tool head 3 includes a tool head 3 that reciprocates vertically (Z-axis direction) with respect to the workpiece 1 and a die 31 attached to the tool head 3.

As shown in FIG. 2, the main part of the laser cutting machine R is such that a work 1 is placed on a table 7 and a laser head 4 or the like that moves relative to the work 1 in the X, Y, and Z axis directions. Composed. As shown in FIG. 4, the planar arrangement of the laser cutting machine R is divided into a processing station 91 and a waiting station 92, and the processing station 91 has a processing table 71 having a size that can cover the moving area of the laser head 4. The laser cutting jig 5 is fixed to the machining table 71, and the workpiece 1 is detachably mounted thereon.

As shown in FIG. 4, above the processing station 91, an X-axis carriage 93 and a Y-axis carriage 94 are installed on the laser cutting processing machine main body so as to be reciprocable in the X-axis direction and the Y-axis direction, respectively. The X and Y axis carriages are provided such that they can be moved and positioned in the X and Y axis directions by driving means (not shown). Further, the X-axis carriage 93 is provided with a Z-axis carriage 95 that can be moved and positioned in the Z-axis direction by driving means.

As shown in FIGS. 5 and 6, the laser head 4 and the photoelectric sensor 6 are provided at the lower end portion of the Z-axis carriage 95. The condenser lens 62 is built in the photoelectric sensor 6, and the laser oscillator The laser beam is guided to the condenser lens 62. Further, an NC control device for controlling the laser cutting machine R and a power supply device such as a laser oscillator and a servo motor are installed adjacent to the laser oscillator (not shown). Here, the laser head 4 includes an assist gas nozzle (not shown). The photoelectric sensor 6 is for detecting the positions of the laser cutting jig 5 and the workpiece 1.

FIG. 6 shows details of the optoelectronic sensor 6, and the condenser lens 62 is set at a position vertically above the jig position measuring hole 53 provided in the laser cutting jig 5 shown in FIG. 7. Next, the red light beam sent from the optical fiber 61 is transmitted through the condenser lens 62 and condensed on the jig position measuring hole 53. When the beam passes through the end of the jig position measuring hole 53, the shape of the jig position measuring hole 53 is determined by measuring the reflection intensity of the beam light. This shape data is taken in, and the deviation between the machine coordinate origin of the laser head and the laser cutting jig 5 is obtained by NC control. The position of the workpiece 1 placed on the stationary position of the laser cutting jig 5 is automatically corrected by simply adding a deviation amount, which is a deviation between the two positions, to the machine coordinates of the laser head. In this way, when the workpiece material has the same specification, the workpiece 1 is placed on the laser cutting jig 5 only by detecting the position of the jig position measurement hole 53 provided in the laser cutting jig 5 only at the beginning. The work of detecting the position of the work 1 that is performed each time the work is replaced can be omitted.

The laser cutting processing jig 5 shown in FIG. 7 is a rectangular steel plate wound through in a window frame shape, fixed to a fixed position on a processing table 72 provided in a weighting station 92, and then the workpiece 1 is mounted. And moved to the processing station 91 as it is. Here, in the processing table 72, the laser cutting processing jig 5 is set on the table with the short side frames 51, 51 on both sides parallel to the Y axis and the upper and lower long side frames 52, 52 parallel to the X axis. Is done. Each of the short side frames 51 and 51 is provided with a jig position measuring hole 53, and four round pins 54 are arranged on one straight line parallel to the X axis on one side of the long side frame 52. Provide upright. As shown in FIG. 8, the workpiece 1 is a rectangular plate-like body, and the size is smaller in the Y-axis direction than the inner dimension of the frame and shorter in the X-axis direction than the inner dimension of the frame. In order to place the workpiece 1 on the laser cutting jig 5, the workpiece reference hole 11 of the workpiece 1 is fitted to the round pin 54 near the workpiece side B provided in the laser cutting jig 5. Since the work 1 is provided with one work reference hole 11 on one side of the long side frame 52 in a straight line parallel to the X axis, and three long round holes 12 are provided at the same time. 12 is also fitted to the other three round pins 54 provided in the laser cutting jig 5.

The X-axis direction of the laser cutting jig 5 is the long side frame 52, and the Y-axis direction is the short side frame 51. However, in the laser cutting jig 5, the long side frame 52 and the short side frame 51 have the same length. It does not matter.

An example of blank processing using the above laser cutting tool will be described. The workpiece 1 is made of SPHC steel plate, the width is 1219 mm × 2438 mm, and the thickness is 4.5 mm. As shown in FIG. 10, the product 2 to be subjected to blank piercing has a substantially rectangular outline 21 in which two types of holes, three holes 22 and eight holes 23, are arranged. Further, one hole 25 is arranged in each hole 22 and one hole 24 is arranged outside the contour 21. These holes 24 and 25 are so-called disposal holes that are necessary before blanking by laser cutting and do not remain in the product. As shown in the arrangement of the products 2 in FIG. 11, a total of 72 products 2, 9 columns in the Y-axis direction and 8 rows in the X-axis direction, are blank-pierced from the workpiece 1. In FIG. 12, the hole 24 and the hole 25, which are discarded holes, are omitted.

Next, an operation procedure for blank piercing the product 2 will be described. (1) As shown in FIG. 11, the products 2 to be blank pierced are arranged on the workpiece 1. As shown in FIG. 10, in the contour 21 of the product 2, a total of eleven holes 25 and eight holes 23 in the hole 22 and one hole 24 outside the contour 21 are punch-pressed. Punched with a processing machine. This punching operation is repeated for 72 locations of the product 2 on the workpiece 1. (2) Next, the workpiece 1 is transferred from the punch press machine to the laser cutting machine R. The positions of the four round pins 54 provided in the laser cutting processing jig 5 fixed to the processing table 72 provided in the weighting station 92 of the laser cutting processing machine R are determined, and the workpiece reference hole 11 is fitted. At this time, the three elongated holes 12 of the workpiece 1 are also fitted to the other three round pins 54 of the laser cutting jig 5. Here, detailed positioning of the round pin 54 and the elongated round hole 12 will be described later. (3) Next, the workpiece 1 is moved to the processing station 91 with the workpiece 1 still placed on the weighting table 72. (4) Then, the position of the jig position measuring hole 53 provided in the laser cutting processing jig 5 is detected by the optoelectronic sensor 6 of the laser cutting processing machine R. Based on this detection value, the deviation amount of the workpiece from the origin of the laser head machine is corrected by NC control, and preparations for cutting out three holes 22 and the contour 21 of the product are started by the laser cutting machine. (5) Next, as shown in FIG. 12, blanking is performed while shifting the row in the direction of the workpiece side B from the top to the bottom in the row close to the workpiece side A of the workpiece 1 and when one row is completed. That is, blanking is started from a work part on a substantially diagonal line farthest from the work reference hole. Here, the details of the ranking of blank processing positions will be described later. (6) When the contour 21 of the product 2 is blanked, the product 2 is carried out under the machining table 72 each time. As described above, the blank piercing process at 72 locations in one workpiece 1 is completed using two types of single-function machines. In addition, for the blank processing of the next workpiece 1, the position detection work of the jig position measuring hole 53 described in the above (4) is unnecessary, and the same processing is performed from (5) onward.

In the case of blank piercing using the punch press machine single-function machine and laser single-function machine according to the present invention, the processing time by the punch press processing machine is 10 minutes and the processing time by the laser cutting machine is 31 minutes. 41 minutes is the total processing time for 100 products. In addition, when the multi-function machine was adopted as the same condition, it took 52 minutes as a total machining time for 100 pieces.

As described above, if the machine satisfies certain conditions, the productivity of the two types of single-function machines is about 30% higher than that of the multi-function machine. Here, the certain condition is that the machine coordinate origin of the punch press tool head and the laser cutting machine laser head in the multifunction machine can be the same. Moreover, the position of the workpiece | work by the pallet changer with which a laser single-function machine is equipped can be detected easily each time. Furthermore, the second coordinate origin is assumed based on the detected position, and the machining program can run from there to start blank punching. These processing preparation times must be made promptly within a total of 2 minutes.

The punching process is performed as described above, and the operation will be described next.

In the laser cutting jig 5, four round pins 54 are provided upright on the surface of the long side frame 52 in parallel with the X axis in one long side frame 52. The round pin 54 closest to the workpiece side B shown in FIG. 8 requires precise fitting with the workpiece reference hole 11 of the workpiece 1. The round pin 54 has a fitting symbol h7, and the reference hole 11 has a fitting symbol H7. It is desirable to have a degree of tolerance. Further, the fitting tolerance between the round pin 54 and the short diameter dimension of the long round hole 12 is the same. In this embodiment, the diameter of the round pin 54 is 11.98 mm, while the diameter of the reference hole 11 is 12.05 mm. The major axis of the elongated round hole 12 was 14.00 mm, and the minor axis was 12.05 mm.

FIG. 9 is an enlarged view showing the state of thermal expansion of the workpiece in the vicinity of the oblong hole 12 and the hole 24. The solid line of each hole is the position at the start of blank machining, and the dotted line is the machining progress and the workpiece 1 is heated to the maximum. Indicates the position when inflated. When the workpiece 1 is set on the laser cutting jig 5, first, the X-axis direction is determined so that the long-bore long-diameter end E of the long round hole 12 is in contact with the round pin 54. Here, the long hole long-diameter direction end E is a part on the workpiece side A side. As described above, since the long diameter of the round hole 12 is 14.00 mm and the diameter of the round pin 54 is 11.98 mm, the gap in the X-axis direction is 2.02 mm, and the thermal expansion dimension of the workpiece 1 in the X-axis direction is absorbed. Is possible. Normally, according to laser cutting, the thermal expansion dimension of the workpiece 1 in the X-axis direction is about 1.5 mm at maximum. Accordingly, when the gap is 2.02 mm, the thermal expansion due to the heating of the work 1 by laser cutting can be sufficiently absorbed, and the work 1 is thermally expanded during the laser cutting, so that the long hole major axis end F is formed. It expands freely without being constrained by contacting the round pin 54.

Further, the Y-axis direction is determined such that the long hole short diameter direction end H of the long round hole 12 is in contact with the round pin 54. Here, the long hole short diameter direction end portion H is a portion on the opposite side to the workpiece side C side. As described above, the short circle hole 12 has a minor axis of 12.05 mm and the round pin 54 has a diameter of 11.98 mm, but is free from elongation in the Y-axis direction. The thermal expansion dimension can be absorbed. Normally, according to laser cutting, the thermal expansion dimension of the workpiece 1 in the Y-axis direction is empirically the maximum at the position of the workpiece side D, which is about 0.7 mm.

As described above, thermal expansion due to heat accumulation occurs in the workpiece 1 by blank processing by the laser cutting machine. As shown in FIG. 9, the position of the oblong hole 12 moves while rotating slightly in the direction of the arrow K about the round pin 54 (pin on the work side B side) that fits into the work reference hole 11, and is shown by a dotted line. The long round hole 12 'shown in Fig. 5 becomes the position when the maximum thermal expansion occurs in the workpiece. That is, in the laser cutting jig 5, the long hole short diameter direction end G ′ of the long round hole 12 is in contact with the round pin 54, and the long hole long diameter direction end F ′ of the long round hole 12 is in contact with the round pin 54. . In summary, the workpiece 1 has the round pin 54 (the pin on the workpiece side B side) as an axis in the direction of the arrow K that combines the thermal expansion in the X-axis direction and the Y-axis direction. It moves freely without being constrained, such as coming into contact with.

Similarly, the position of the hole 24 moves while rotating slightly in the direction of the arrow K around the round pin 54 fitted in the workpiece reference hole 11, and the hole 24 ′ indicated by the dotted line causes maximum thermal expansion in the workpiece. The position when hit. The other holes 23 and 25 exhibit the same behavior due to the thermal expansion of the workpiece 1.

For the reasons described above, the blank machining order of the product outer peripheral contour by the laser cutting machine is performed according to the following procedure. As shown in FIG. 12, the machining is moved from the product 2 near the workpiece side D in the row near the workpiece side A of the workpiece 1 in the direction of the arrow M. That is, blanking is started from a work part on a diagonal line farthest from the work reference hole. Next, blank processing is performed by sequentially moving the columns. That is, when the first row is completed, the blanks are processed by sequentially moving the rows to the second row, the third row, and the workpiece arrow N one after another. At this time, every time the product 2 is blanked, the same amount of heat is conducted in the direction of 360 degrees around the product 2. As the number of blanks of the product 2 increases, in the long side direction, the residual heat amount due to the part of the work 1 is larger on the work side A than on the work side B. In the short side direction, the work side D has a larger amount of residual heat than the work side C. In particular, the vicinity of the product 2 after blanking is displaced the most, and the unprocessed portion has a large amount of heat dissipation into the air and a small amount of displacement. In consideration of the difference in the thermal effect on the workpiece part, the work hole due to laser heat at the time of blanking is formed by making the reference hole 11 of the work 1 a round hole and the other three places being an elongated round hole 12. It is possible to absorb the amount of displacement. That is, by making the three holes close to the workpiece side A into an oblong hole shape, the movement amount of the workpiece 1 due to thermal expansion in the workpiece side A direction and the workpiece side D direction can be absorbed. In this way, the error between the hole position in the pre-punched outer contour that has already been completed and the outer contour hole position of the product by laser cutting can be suppressed to ± 0.2 mm or less. As described above, blank processing is started from the side of the workpiece side A when performing blank processing by laser cutting processing. Therefore, the side of the workpiece side A is greatly affected by thermal expansion due to accumulation of laser cutting heat. On the side B side, the influence of thermal expansion is small and the amount of thermal displacement is small. That is, the workpiece side A side is punched while the thermal expansion at the initial stage of laser cutting is small, and when the accumulation of thermal expansion increases, the machining position moves to the workpiece side B side where the influence of thermal expansion is small. Thus, the amount of thermal displacement of the unprocessed portion of the work 1 can be reduced as much as possible. For these reasons, the long and short diameters of the round hole 12 are optimally determined with respect to the diameter of the round pin 54, so that the thermal displacement in the X and Y axis directions is not restricted by the round pin 54. Can be absorbed into.

That is, by performing blanking with a laser cutting machine from the edge of the workpiece that is farthest from the workpiece reference hole 11 of the workpiece 1, the workpiece 1 is set in the X axis with the round pin 54 fitted with the workpiece reference hole 11 as an axis. Blank processing is performed while thermally expanding in the Y-axis direction at the same time.

In this way, it is possible to suppress the deterioration of the cutting accuracy due to the thermal expansion of the workpiece as much as possible, and for the workpiece having the same specification, the setting operation of the machining reference coordinate value after the second time can be omitted.

In the embodiment, four round pins 54, three long round holes 3 and three jig jig jig position measuring holes 53 are described. However, the round pins 54 provided on the laser cutting jig 5 are described. May be at least two locations for the workpiece reference hole 11 and the oblong hole 12. Accordingly, at least one oblong hole 12 provided in the work 1 may be provided. Further, at least two jig jig position measurement holes 53 for measurement by the photoelectric sensor are required.

The use of the present invention is not limited to the blank processing method by laser cutting. Needless to say, the present invention may be used for a blank processing method by arc cutting such as gas or plasma cutting in which a workpiece is thermally expanded by accumulating cutting processing heat in the workpiece as in the case of laser cutting processing.

It is a whole top view of a punch press processing machine. It is a whole top view of a laser cutting machine. 1 is an overall plan view of a multifunction machine. 1 is an overall perspective view of a laser cutting machine according to an embodiment of the present invention. It is a perspective view of a laser head same as the above. It is sectional drawing of an optoelectronic sensor same as the above. It is a top view of a laser cutting processing jig same as the above. It is a top view which shows the state which set the workpiece | work to the laser cutting processing jig same as the above. FIG. 4 is an enlarged view of the vicinity of a long circle and a round hole showing the thermal expansion state of the workpiece. It is a top view of the product by which a blank piercing process is carried out same as the above. FIG. 3 is an array diagram of products on a workpiece to be subjected to blank piercing. It is a figure which shows the order | rank of the laser cutting process of the product on a workpiece | work same as the above.

Explanation of symbols

P Punch press machine R Laser cutting machine J Multi-function machine 1 Work piece 11 Work reference hole 12 Long round hole 2 Product 21 Outline 22 Hole 23 Hole 24 Hole 25 Hole 3 Tool head 31 Mold 4 Laser head 5 Laser cutting jig 51 Short side frame 52 Long side frame 53 Jig position measurement hole 54 Round pin 6 Photoelectric sensor 61 Optical fiber 62 Condensing lens 7 Table 71 Processing table 72 Waiting table 91 Processing station 92 Waiting station 93 X-axis carriage 94 Y-axis Carriage 95 Z-axis carriage A Work side B Work side C Work side D Work side E Long hole long diameter end E 'Long hole long diameter end F Long hole long diameter end F' Long hole long diameter end G Long hole Short hole end G 'Long hole short diameter direction end H Long hole short diameter direction end H' Long hole short diameter direction end K, M, N Arrow

Claims (1)

After piercing with a punch press machine,
In the processing method of the sheet metal which performs blank processing with a laser cutting machine,
The blanking process uses a laser cutting machine equipped with a weighting station and a processing station,
Fixing the laser cutting jig to the waiting station;
While fitting the workpiece reference hole drilled in the workpiece to the round pin standing on the laser cutting jig,
The other round pin erected on the laser cutting jig is fitted with an elongated hole drilled in the workpiece,
Then, after these are moved from the waiting station to the processing station,
A blank piercing method, comprising the step of starting blank processing from the workpiece part farthest from the workpiece reference hole.

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