JPH09285965A - Storage method for grinding/polishing tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a loss in a preparation time so as to maintain a highly precise shape by storing a grinding/polishing tool with at least its main body part immersed in working fluid. SOLUTION: After working fluid 6 is injected into a reservoir tank 2 until the upper ends of partition walls 8, 8', 8", 8"' and thermocouples 9, 9' are sank below a fluid level, the whole of grinding/polishing tools 1, 1', 1" are gently immersed below the fluid level between the partition walls 8, 8', 8", 8"'. Subsequently, the reservoir tank 2 in which the whole of the grinding/polishing tools 1, 1', 1" are immersed and stored is sealed by means of a lid 7. For keeping the working fluid 6 at a constant temperature, the fluid temperature of the reservoir tank 2 in which the whole of the grinding/polishing tools 1, 1', 1" are immersed in the fluid is measured by means of the thermocouples 9, 9', and a cooling device 3 and a heating device 4 are controlled properly, so that the whole of the grinding/polishing tools 1, 1', 1", is stored at the constant temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool used for precision processing such as grinding and polishing of glass lenses. More specifically, the present invention relates to a method for storing a grinding or polishing tool such as a glass lens having a liquid absorbing property or a moisture absorbing property.

[0002]

2. Description of the Related Art As a reference for conventional storage methods for grinding and polishing tools, etc., see Rikiya Fukuda "Grinding work method", published by Riko Engineering Co., Ltd., September 20, 1969. It is usually stored in a dry state. "In addition, even in wet processing that requires sub-micron precision such as polishing processing of glass lenses, for example, Fujimi Abrasives Industry Co., Ltd. The “How to use CERPET” issued and distributed says “Please soak in water for about 5 minutes before making the surface so that it contains enough water.” Is not considered at all. That is, the storage is carried out in a dry state as in the former document, and the storage is made to contain water just before the surfacing.

[0003]

As described above, when the grinding / polishing tool that has been dried and stored is mounted on a grinder or a polishing machine and the workpiece is machined while being coated with the machining fluid, the tool is As a result, the working fluid penetrates through the holes formed in the tool. This osmotic pressure causes the tool to deform. Further, when a resin called so-called resin bond is used as the binder of the tool, there is a problem that the resin is deformed due to moisture absorption.

The problems of the above-mentioned prior art will be described based on experimental results. This experiment was performed using a cerium oxide-based abrasive and a thermosetting resin binder with a porosity of 25 to 3
Water absorption / drying and dimensional change were performed using three types of polishing pellets having 0%, an outer diameter of 26 mm, and a thickness of 20 mm.

The result will be described with reference to the drawings. FIG.
Is the time elapsed after immersion in water in a conventional tool and the above 3
It is a graph which shows the relationship with the water absorption of various kinds of tools. FIG.
[Fig. 4] is a graph showing a lapse of time and a dimensional change after immersion in water in a conventional tool. FIG. 6 is a perspective view showing a case of conventional wet processing.

FIGS. 7 (a) and 7 (b) are plan views showing the state of interference fringes on the polished surface of a workpiece processed by a tool before and after storage in the conventional storage method. The time until the water absorption is saturated in the tool having liquid absorbency or hygroscopicity is 3
The tool types showed very different differences: tool A for 1.5 hours, tool B for about 30 minutes and tool C for about 28 hours. Further, in the case of performing the wet machining while supplying the machining fluid, if the water absorption amount of the tool is large, as shown in FIG. 6, a local fluid shortage or a vacuum state 15 occurs, and abrupt heat generation or the work 14 and the tool 1 occur. Adhesion occurs, resulting in surface sagging due to alteration of the machined surface, chattering, and uneven machining resistance.

That is, when the tool 1 which has been stored in a dry state is reused, at least the above-mentioned saturation time is required to be immersed in the liquid before processing, and when the processing is interrupted or the setup is changed, for example, in the case of the tool C. Will have to be ready for more than 28 hours.

Next, with respect to the above-mentioned three types of tools, the time course after immersion in water and the dimensional change of the tools will be described with reference to the graph of FIG. As shown in the figure, in all cases, the deformation continued even after the water absorption was saturated, and after about 3 hours for tool A and tool B, tool C
Then, the deformation becomes stable after about 30 hours. Therefore,
If surfacing and machining are performed before this deformation is stabilized, the tool shape changes during machining, and it is impossible to perform precision grinding and polishing of the workpiece, that is, sub-micron surface accuracy. When the tool is stored in the air, if the storage time is short, it is not always necessary to immerse the tool in the liquid for the above time, but it is difficult to control the evaporation amount of the liquid, and it is practically stable. Must be soaked for maximum time to reach. The dipping time before surface preparation differs depending on the type of tool, and since dipping for a long time is required, jig and tool management and preparation for setup are extremely complicated. There is a waste of time.

Further, in dry storage, the following quality problems occur. Tool A as shown in FIG.
After being sufficiently hydrated with water, a curvature of R16 is applied, the surface is chamfered, and then a lens of φ20 is polished. After the interference fringes on the polished surface obtained by this polishing and the tool were dried and stored as shown in FIG. 7 (b) and the residual water content became 60 wt%,
Comparing with interference fringes on the polished surface when the lens is polished by immersion in a liquid for 24 hours, a large habit is generated in FIG. 7B. One NR is about 0.3 μm, and it is difficult to measure the tool shape because the value is small.
This is considered to be due to the following reasons. When the tool contains water, elastic deformation and plastic deformation occur due to the osmotic pressure of water. Further, in the case of the above tool, the peculiar deformation due to the moisture absorption of the resin occurs. When this is stored in a dry state, the drying progresses from the outer surface of the tool, so the dry portion of the outer surface
It contracts, and some swelling occurs in the non-drying part inside. Therefore, waviness occurs on the surface of the tool, and the plastically deformed portion and the elastically deformed portion become unbalanced inside the tool, and when water is contained again, deformation occurs in the direction in which the waviness is expanded. That is, after chamfering, as shown in FIG. 5, the tool stored in a dry state does not recover the undulation of the surface generated during drying even if it is immersed in water until the deformation becomes stable. I have to.

It is well known that when powders such as polishing powders and sands are wet with water and then dried, they agglomerate and adhere. However, sludges that have settled or adhered to the tool surface are also It firmly adheres to the tool surface and causes scratches.

In the above description, the glass lens polishing tool that requires particularly high processing accuracy is described, but the essence of the problem is that the pores in the polishing tool are impregnated with the processing liquid and the polishing accompanying this. This is the deformation of the tool, that is, the strength of the binder, and even when an oil-based grinding fluid is used, the same problem occurs if impregnation of the grinding fluid into the polishing tool and outflow of the grinding fluid from the tool surface occur.

The present invention has been made in view of the above-mentioned various problems.
It is an object of the present invention to provide a tool storage method that can maintain a highly accurate shape with no waste during setup and is easy to manage.

[0013]

According to the present invention, the grinding or polishing tool is stored in a state where at least the liquid-absorbing or hygroscopic body is immersed in the working liquid, so that the tool is the same as before the tool is stored. It is a tool storage method that can maintain the characteristics and eliminates processes such as chamfering and setup before machining.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) FIG. 1 is a plan view showing a cross section of a liquid storage tank according to Embodiment 1 of the present invention.

The rectangular parallelepiped box body shown in FIG.
Is a liquid storage tank 2 in which is stored. The liquid storage tank 2 has a holding portion 1b called a shank attached to a grinding machine or a polishing machine at one end, and has a chamfered surface at the other end for processing a workpiece. Tool and polishing tool 1, 1 ′ provided with a main body 1 a having a water-absorbing or hygroscopic property, or a grinding and polishing tool 1 ″ having a whole body 1 a having a liquid-absorbing property or a hygroscopic property such as a wheel tool. , Etc. When the tools are in contact with each other when they are dipped, or when the tools fall down on the side wall, tools 1, 1 ', 1'
Partition walls 8, 8 ′, 8 ″, 8 ″ ″ made of a cushioning material such as a sponge are arranged at desired intervals in the side wall and the liquid storage tank 2 so that ′ is not damaged.

A flat plate-like lid 7 for closing the liquid storage tank 2 is attached to one end of the upper edge of the liquid storage tank 2. Further, on the outer wall on the left side of the liquid storage tank 2, a cooler 3, a heater 4, and a control unit 5 for controlling the same are held vertically for keeping the working liquid 6 in the liquid storage tank 2 at room temperature. It is composed of arrays. Further, thermocouples 9 and 9'for measuring the liquid temperature, which are linked with the control unit 5, are provided at the middle of the side wall in the liquid storage tank 2 so as to project.

A method of storing the entire holding portion 1b of the grinding and polishing tools 1, 1 ', 1''and the main body portion 1a using the liquid storage tank 2 constructed as described above will be described. First, the working fluid 6 is placed in the liquid storage tank 2 with partition walls 8, 8 ′, 8 ″, 8
After pouring until the upper end of the ″ ″ and the thermocouples 9 and 9 ′ are below the liquid surface, the entire grinding or polishing tool 1, 1 ′, 1 ″ is divided into partition walls 8, 8 ′, 8 ″, 8 ′. Let it stand still below the surface of the liquid. Subsequently, the liquid storage tank 2 in which the entire grinding and polishing tools 1, 1 ′, 1 ″ are dipped and housed is sealed with a lid 7.

The storage tank 2 in which the whole of the grinding and polishing tools 1, 1 ', 1 "is immersed in the liquid is measured by thermocouples 9 and 9' in order to keep the working liquid 6 at a constant temperature. , The cooler 3 and the heater 4 are appropriately controlled to grind and polish tools 1, 1 ', 1
The whole ″ is always stored at a constant temperature.

As the working liquid 6 in the liquid storage tank 2, it is desirable to use an unused working liquid containing no sludge or the like. Further, it goes without saying that the processing liquid 6 is not related to oiliness or water solubility. According to the above-mentioned present embodiment, the machining fluid 6
It is possible not only to prevent the outflow of dry matter, but also to prevent the intrusion of impurities from the outside. Also, by setting the temperature during grinding or polishing and the temperature during storage to the same temperature, there is no need for warm-up operation when changing tools, or only a short operation time is required.

(Embodiment 2) FIGS. 2 (a) and 2 (b) show Embodiment 2 of the present invention, in which FIG. 2 (a) shows a main body which has no holding portion and is entirely liquid-absorbent or hygroscopic. 1a is a grinding tool, and (b) is a polishing tool comprising a holding part 1b called a shank and a body part 1a having a liquid absorbing property or a hygroscopic property. Each polishing tool and the body part 1a of the polishing tool are formed of a synthetic resin film. It is a perspective view of the state covered with.

Reference numeral 10 shown in the figure is a thin film formed of polyethylene material in a square shape. As shown in the figure, the main body 1a of the grinding and polishing tool 1, 1'is in this thin film immediately after processing, respectively, when it is still sufficiently impregnated with the working fluid or after being dipped in the working fluid to impregnate the tool 1a. , 1'to the outer surface of the main body 1a of the tool 1, 1 ', the main body 1a of the tool 1, 1'
The entire main body 1a is covered and hermetically sealed so that coating unevenness of the working liquid does not remain on the outer surface of the substrate and a portion exposed from the polyethylene thin film 10 does not occur.

In the present embodiment, when a large tool 1, 1 ', etc. is stored, that is, as shown in the first embodiment, the machining liquid 6 is used.
It is applied when the method of dipping is impossible. Regarding the storage environment of the present embodiment, the grinding and polishing tools 1, 1
It goes without saying that the main body 1a having the liquid absorbing property or the hygroscopic property may be dried and stored in the same manner as the conventional storage method.

(Embodiment 3) FIG. 3 shows Embodiment 3 of the present invention, which is a sectional view of a grinding and polishing tool 1, 1 ′ having a liquid-absorbing or moisture-absorbing main body 1 a in a stored state. It is a figure.

In the figure, the same members and configurations as those of the first and second embodiments are designated by the same reference numerals and the description thereof will be omitted. The rectangular parallelepiped liquid storage tank 2 is filled with water 13, and the grinding and polishing tools 1, 1 ′ are filled with water 13 at a desired interval so that they do not come into contact with each other. A holder 11 arranged at one end of the holder 11 is held by a holder 11 disposed between the side walls in the upward direction, and a main body 1a having a liquid absorbing or hygroscopic property at the other end is submerged in the water 13. It is attached to the suspension rack in the closed state. An ultrasonic oscillator 12 for stirring and shaking the water 13 is arranged on the outer wall of the bottom surface of the liquid storage tank 2. The operation of the present embodiment having the above configuration will be described.

As shown in the drawing, a predetermined amount of water 13 is injected into the liquid storage tank 2, and then the holder 11 is attached to the holder 11 at one end of each of the grinding and polishing tools 1 and 1 ', and the other end is attached. The main body 1a is suspended and mounted so as to be submerged in the water 13.

After the grinding and polishing tools 1 and 1'are suspended and mounted, the ultrasonic oscillator 12 is operated to complete the storage. In the above-described present embodiment, the grinding fluid impregnated in the main body 1a of the tool is replaced with water during the storage of the tool, but the fluid absorption and deformation of the tool are essentially the same as those of the machining. There is no problem.

In the present embodiment, the grinding and polishing tool 1,
Although it is configured so that only the main body 1a of 1'is dipped,
Holder 11 and holder 1b for grinding and polishing tools 1, 1 '
Needless to say, it may be configured to be immersed in the liquid.

The method of the present embodiment is effective when the stock solution of the water-soluble grinding fluid is expensive, when it takes a long time to prepare the aqueous solution, or when the grinding fluid is easily decomposed. . In addition, in the present embodiment,
Since the surface of the grinding tool and polishing tool is cleaned by operating the ultrasonic oscillator as appropriate during storage, the tool can always be kept and stored in a clean state. Moreover, since the storage liquid is water, it can be easily replaced when it becomes dirty.

No habit as shown in FIG. 7 (b) was found in the interference fringes on the polished surface of the workpiece machined by the tool stored by the storage method shown in the above embodiment.

[0030]

According to the present invention, the main body of the tool used for processing the workpiece can maintain the same tool shape and characteristics as those before storage, so that it is necessary to chamfer before processing. Moreover, there is no waste during setup, and tool management can be done easily. Also, the surface of the tool body does not dry, and the sludge, etc. adhering to the surface of the tool body does not solidify or stick like dry storage, and the surface condition at the end of processing is maintained. There are many effects such as no new scratches.

Further, when the processing liquid is water-soluble, if water is used as the storage liquid, it is possible to easily replace it when it becomes dirty and to obtain the effect of being inexpensive.

[Brief description of drawings]

FIG. 1 is a side sectional view of a liquid storage tank for storing a tool according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a tool storage method according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view from a side surface of a liquid storage tank that stores a tool according to a third embodiment of the present invention.

FIG. 4 is a graph of experimental data of immersion conditions of a conventional grinding tool.

FIG. 5 is a graph of experimental data on the immersion state of a conventional grinding tool.

FIG. 6 is a perspective view showing wet processing of a conventional tool.

FIG. 7 is a plan view showing interference fringes of a polished surface of a workpiece processed by a tool after chamfering and interference fringes of a polished surface of a workpiece processed by a tool stored by a conventional storage method.

[Explanation of symbols]

 1, 1 ', 1' 'Grinding and polishing tools 1a Main body 1b Holding part 2 Storage tank 3 Cooler 4 Heater 5 Control part 6 Working fluid 8, 8', 8 '' ', 8' '' Partition wall 9 , 9 'Thermocouple 10 Polyethylene thin film 11 Cage 12 Ultrasonic oscillator 13 Water

Claims (2)

[Claims] 1. A method for storing a grinding and polishing tool, characterized in that at least a main body of the grinding and polishing tool is stored in a state of being immersed in a working liquid. 2. The method for storing a grinding and polishing tool according to claim 1, wherein when the working fluid is water-soluble, it is immersed in water.