JPH01228768A - Profiling grinding machine - Google Patents

Abstract

PURPOSE:To dissolve the warp of a profiling grinding machine main body caused by heat generated by a light source located near the main body by providing a cooling mechanism which is to cool the profiling grinding machine main body through circulating the liquid of cooling within and without the profiling grinding machine main body located near the light source. CONSTITUTION:A worked matter 2 is projected onto a screen 3 by means of light emitted by a light source, and the worked matter 2 is processed in profiling grinding, as the worked matter 2 and a rotary grinding stone 4 are made to move relatively after the projected image of the worked matter projected as above. In this instance, the liquid of cooling 6 is circulated within and without a profiling grinding machine main body 5 near the light source by using a cooling mechanism 7, and the profiling grinding machine main body 5 near this light source is continued to be cooled by means of this liquid of cooling 7. As a result, it is prevented that a warp occurs at this main body 5 due to the main body 5 being heated by means of heat generated by the light source. In addition, at least part of the liquid of cooling 6 to be circulated is sprinkled over the surface of a light permeating body 8 covering the upper part of the light source by using a washing mechanism 9, and the surface of this light permeating body 8 is washed, and the image of projection is always made to be clear.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention involves relatively moving a workpiece and a rotating grinding wheel in accordance with a projected image of the workpiece projected on a screen. This invention relates to a profile grinder that grinds a workpiece.

[Prior art] In recent years, with the miniaturization and higher precision of electronic components such as lead frames, ultra-precision mold parts such as punches and gougs with dimensional accuracy of ±1 μm or less have been developed for forming the electronic components. Demand for processing is increasing.

When processing ultra-precision mold parts for forming electronic components, conventionally, the above-mentioned copy grinding machine is placed in a room kept at a constant temperature of 20°C ± I'C, and the above-mentioned super-precision mold parts are processed using the copy grinding machine. Grinding precision mold parts.

This copy grinding machine usually includes a light source integrated inside the copy grinding machine main body for projecting a workpiece such as an ultra-precision mold part onto a screen.

By the way, the above-mentioned light source is usually a large 300W lamp, etc., and it emits high heat, causing the main body of the copying grinder in the vicinity to
Heat to significantly above °C.

Then, the heat generated by this light source distorts the copy grinder body, reducing the machining accuracy of the copy grinder.

Therefore, in the conventional copy grinding machine, a cooling fan for cooling the light source is provided around the light source.

[Problems to be Solved by the Invention] However, using only the cooling fan described above cannot accurately prevent distortion of the copy grinder body due to the heat generated by the light source.

In order to prevent distortion of the copy grinder main body due to the heat emitted by the light source, some copy grinders have been provided with the light source separately outside the copy grinder main body.

However, in this case as well, since the light source that emits high heat is located near the main body of the copy grinder, it has not been possible to accurately prevent distortion of the main body of the copy grinder due to the heat emitted by the light source.

Therefore, using a conventional profile grinder, the workpiece can be cut down to ±1 μm.
In order to grind with the following machining accuracy, it is necessary to rely on the skill of the operator, and it has been extremely difficult to achieve this machining accuracy by NC-controlled machining.

In addition, in the above-mentioned conventional copying grinder, in order to prevent the grinding powder of the workpiece that has been ground by the grinding wheel from falling directly onto the light source, a light-transmitting body such as a light-transmitting glass is placed above the light source. It's covered.

Therefore, in the above-mentioned conventional copy grinding machine, during use, grinding powder from the workpiece falls on the surface of the light transmitting body and adheres to the surface of the light transmitting body, and the attached grinding powder etc. A portion of the light passing through the light transmitting body was obstructed, and a portion of the projected image of the workpiece projected onto the screen became unclear or distorted due to the light from the light source passing through the light transmitting body.

In addition, deviations may occur in the machined shape and dimensions of the workpiece to be ground according to the projected image.

The present invention was made to solve this problem, and its purpose is to accurately prevent the main body of the copying grinder from being distorted due to the heat emitted by the light source for projecting the projected image of the workpiece onto the screen. It is an object of the present invention to provide a copying grinder which can prevent grinding powder and the like from falling and adhering to the surface of a light transmitting body covering above a light source.

[Means for solving the problems] In order to achieve the above object, the copying grinder of the present invention has the following features:
As shown in FIG. 2 and FIG. 2, a workpiece 2 is projected onto a screen 3 by light emitted from a light source 1,
In a copying grinder that grinds a workpiece 2 while relatively moving the workpiece 2 and a rotating grinding wheel 4 following a projected image of the workpiece 2 projected on the screen 3, the light source 1 The cooling liquid 6 flows inside and outside of the nearby copy grinding machine body 5.
The cooling mechanism 7 is provided with a cooling mechanism 7 that cools the copying grinder main body 5 by circulating water, and at least a part of the cooling liquid 6 that is circulated by the cooling mechanism 7 is sprinkled on the surface of the light transmitting body 8 that covers the upper part of the light source I. The present invention is characterized in that it includes a cleaning mechanism 9 that cleans the surface of the light transmitting body 8.

In addition, in the profile grinding machine of the present invention, as shown in FIG. 3, the main shaft of the grinding wheel 4! The cooling mechanism 7 circulates at least a portion of the cooling liquid 6 inside and outside of the bearing member 11 supporting the bearing member 1.
1 and an auxiliary cooling mechanism 1 that cools the main shaft IO inside thereof.
2 is suitable.

[Function] In the copying grinder of the present invention, the light source 1 is cooled by the cooling liquid 6 that is circulated inside and outside the copying grinder body 5 using the cooling mechanism 7.
By continuing to cool the nearby copy grinder main body 5, it is possible to prevent the copy grinder main body 5 from being heated by the heat generated by the light source 1 and causing distortion during use of the copy grinder.

In addition, by using the cleaning mechanism 9 to continue sprinkling at least a portion of the cooling liquid 6 circulated by the cooling mechanism 7 onto the surface of the light transmitting body 8 covering the upper part of the light source l, it is possible to use the cleaning mechanism 9 while the copying grinder is in use. Grinding powder and the like that fall and adhere to the surface of the light transmitting member 8 can be continuously washed and removed from the surface of the light transmitting member 8 to the outside thereof.

Furthermore, if the grinding wheel is equipped with an auxiliary cooling mechanism 12 that cools the ball shaft 10 and the bearing member 11, the mechanism 12
By continuing to cool the bearing member 11 and the main shaft IO inside the bearing member 11 with the cooling liquid 6 which is circulated inside and outside the bearing member 11 using It is possible to prevent the member 11 from being distorted due to frictional heat generated between the main shaft IO and the bearing member 11, thereby preventing the center position of the member 11 from going out of order and its dimensional accuracy from decreasing.

[Example] Next, embodiments of the present invention will be described with reference to the drawings.

1 and 2 show a preferred embodiment of the copying grinder of the present invention, FIG. 1 is a partially cutaway front view schematically showing the copying grinder, and FIG. 2 is a cooling of the copying grinder. It is an enlarged structural explanatory view of a mechanism and a cleaning mechanism part. The embodiment shown in the above figure will be described below.

In FIG. 1, reference numeral 100 denotes N C along the inner surface of the copy grinding machine body 5 and the arm portion 101 extending upward to the right side of the body.
A Y-direction table 103 that moves up and down, that is, in the Y-axis direction, by an rtA control motor 102, and an N-direction table that moves along the table
An X-direction table 104 is moved back and forth in the front-rear direction, that is, in the X-axis direction, by a C-controlled motor (not shown), and an A drive motor (not shown) is installed along the inner surface of an arm portion 107 that extends above the table.

), the grindstone support 108 that reciprocates up and down, that is, in the Y-axis direction, the grinding wheel 4 that rotates at high speed supported inside the support, and the NC control motors 102, 105, etc., are operated according to predetermined NG data. This is a conventionally well-known copying grinder that includes an NC control unit 109 and the like.

As shown in FIG.
A is prepared. Further, a pair of cooling fans 111 for cooling the lamp 1a are provided in the internal space 110 of the copy grinding machine body near the lamp Ia.

Further, a through hole 112 is formed in a part of the copy grinding machine body 5 located directly above the lamp Ia, and a plurality of concave and convex lenses +13 are fitted into the through hole.

Further, the upper surface of the through hole 112 of the copy grinding machine main body is covered from the outside with a light transmitting body 8 having a multilayer structure made of a flat light transmitting glass 8a. Furthermore, a cylindrical body 1!4 having a relay lens is provided at the upper part of the copying grinder just above the through hole 112 of the copying grinder main body. In addition, the cylindrical body 1
A screen 3 is provided on the upper part of the copy grinding machine in communication with the interior of the grinding machine 14 for projecting a projected image of the workpiece 2.

The structure described above is similar to the structure of a conventionally known copying grinder, but in the copying grinder of the present invention, as shown below, the coolant is supplied to the inside and outside of the copying grinding machine body 5 near the light source 1. A part of the cooling liquid 6 circulated by the cooling mechanism 7 is provided on the surface of the light transmitting body 8 covering the upper part of the light source 1. It is equipped with a cleaning mechanism 9 that cleans the surface of the light transmitting body 8 by sprinkling.

That is, as shown in FIG. 2, the upper surface of the copy grinder main body 5 around the through hole 112 provided in the copy grinder main body 5 is hollowed out.
The upper surface of the main body 5 is provided with a cooling liquid storage tank 200 having a predetermined depth.

In addition, a coolant storage tank 201 is installed on the side of the copy grinder main body 5.
and a constant temperature cooling pump 202 that cools the coolant 6 stored in the tank to a predetermined constant temperature state.

Then, between the coolant storage tank 201 and the constant temperature cooling pump 202, the coolant 6 stored in the coolant storage tank 201 is sucked into the constant temperature cooling pump 202 and returned to the coolant storage tank 201. A coolant suction pipe 203a and a coolant return pipe 203b are provided.

Further, a coolant circulation pump 204 and a precision filter 205 are interposed in the middle between the coolant storage tank 201 and the vicinity of the light transmitting body 8 covering the upper surface of the through hole 112 of the copy grinding machine body. , a coolant feed pipe 206 is provided.

A nozzle 207 for injecting the cooling liquid 6 toward the surface of the light transmitting body 8 is provided at the tip of the coolant feeding pipe 206 disposed near the light transmitting body 8 and communicating with the inside of the tip of the pipe 206. .

Furthermore, the cooling liquid storage tank 200 and the cooling liquid storage tank 201 on the upper surface of the copy grinding machine body are
A coolant discharge pipe 208 is provided to return the coolant 6 once stored in the coolant tank 20+ into the coolant storage tank 20+.

Additionally, on the upper surface of the coolant storage tank 201, grinding powder from the workpiece 2 mixed in the coolant 6 discharged from the coolant discharge pipe 208 and the tip of the previously mentioned coolant return pipe 203b is removed. A vapor filter 209 is installed to filter and remove the vapor.

The profile grinding machine shown in FIGS. 1 and 2 is constructed as described above.

Next, an example of its use will be explained.

The NO control unit 1 is installed in the same way as the conventional copy grinding machine
The NO control motors 102, 105, etc. are operated according to the NC data input to the
A grindstone support 108 equipped with a grinding wheel 4 that rotates at high speed is attached to the Z-direction table 1 on the inner end surface of the workpiece 2 mounted thereon.
06 The rotating grinding wheel 4 is used to reciprocate vertically along the inner surface of the upper arm 107 to perform grinding.

Then, while the workpiece 2 is being ground by the rotating grinding wheel 4, the coolant circulation pump 204 and the constant temperature cooling pump 202 of the cooling mechanism 7 are operated, and the cooling pump 20
The coolant 6 in the coolant storage tank 201, which has been cooled to a predetermined constant temperature state by circulating the coolant 6, is transferred to the coolant feed pipe 206.
While removing dust contained inside the precision filter 205 in the middle of the pipe, light is emitted from the nozzle 207 at the tip of the coolant feed pipe 206 to cover the upper surface of the through hole 112 of the copy grinding machine body beyond the nozzle 207. The liquid is sprayed onto the surface of the transparent body 8. Then, the cooling liquid 6 sprayed from the nozzle 207 is sprinkled onto the surface of the light transmitting body 8 and the surface of the light transmitting body 8 is washed with the cooling liquid 6. The cooling liquid is allowed to fall and flow into the cooling liquid storage tank 200 on the upper surface of the copy grinding machine body around the through hole 112. Then, the coolant 6 once stored in the coolant storage tank 200 is
Due to the action of gravity, the coolant is sequentially passed through the coolant discharge pipe 208 into the coolant storage tank 201, and is returned again while passing through a vapor filter 209 covering the tank surface to remove grinding powder and the like contained therein.

Then, the coolant flows from inside the coolant storage tank 201 into the coolant storage tank 200 of the profile grinding machine body, where it is temporarily stored, and then returned to the coolant storage tank 201 where it is cooled and maintained at a predetermined constant temperature state. The copy grinding machine main body 5 is kept cooled and maintained at a predetermined constant temperature state of 20° C.±1'C, etc., which is the same as the cooling fluid 6, and the large copy grinding machine main body 5 provided in the internal space 110 of the copy grinding machine main body is kept cooled by the cooling fluid 6. The heat generated by the lamp 1a does not cause distortion in the copy grinding machine main body 5.

In addition, the surface of the light transmitting body 8 that covers the upper part of the large lamp 1a is continuously cleaned with the cooling liquid 6 sprinkled on the surface of the light transmitting body 8, and the grinding powder of the workpiece 2 etc. is left on the surface of the light transmitting body 8. Even if the light transmitting member 8 falls, grinding powder and the like will not continue to adhere to the surface of the light transmitting member 8.

In addition, in the above-mentioned embodiment, depending on the case, the coolant storage tank 20! Only a portion of the coolant 6 is passed through the coolant feed pipe 206 from inside and flows into the coolant reservoir 200 on the top surface of the copy grinder main body.
The other coolant 6 is sprinkled onto the surface of the light transmitting body 8 covering the upper surface of the through hole 112 from a nozzle 207 that communicates with the inside of the coolant 6, and the other coolant 6 is directly passed from the coolant storage tank 201 into the coolant feed pipe 206. It may be made to flow into the storage tank 200.

In addition, in some cases, as shown by the broken line in Figure 1,
The cooling liquid 6 is directed toward the surface of the light transmitting body 8 covering the upper surface of the through hole 112.
The grinding wheel 4 that rotates at high speed has a nozzle 207 that injects
The coolant storage tank 20 is placed nearby and passed from the coolant storage tank 201 into the coolant feed pipe 206.
A part or all of the cooling liquid 6 flowing into the cooling liquid 1,
The cooling liquid 6 is sprayed from the nozzle 207 near the grinding wheel 4 rotating at high speed, and is sprinkled on the workpiece 2 etc. being ground by the rotating grinding wheel 4 instead of the grinding liquid, and then the cooling liquid 6 is sprayed in place of the grinding liquid. The cooling liquid 6 may also be used as a grinding liquid by sprinkling it on the surface of the light transmitting body 8 covering the upper surface of the hole 112 and flowing into the cooling liquid storage tank 200 on the upper surface of the copy grinder main body. Note that when the cooling liquid 6 is used also as a grinding fluid, a rust preventive agent that does not cause corrosion of the workpiece 2 even when sprinkled on the surface of the workpiece 2 is mixed into the cooling liquid 6. It is necessary to use a coolant.

Furthermore, in the profile grinding machine of the above-mentioned embodiment, the workpiece 2
Frictional heat generated between the main shaft 10 of the grinding wheel 4 that rotates at high speed and the bearing member 11 that supports the shaft may cause the center position of the main shaft IO of the grinding wheel 4 to shift or Bearing parts! The grinding accuracy of the workpiece 2 to be ground using the copying grinder may be significantly reduced due to this distortion. Hereinafter, a preferred embodiment of the copying grinder of the present invention will be described, which is equipped with a prevention means for preventing the center position of the main shaft IO of the grinding wheel 4 from shifting and the main shaft IO from being distorted due to this frictional heat.

FIG. 3 shows an enlarged front sectional view of the main shaft of the grinding wheel rotating at high speed of the copying grinder and the vicinity of a bearing member supporting the shaft. The rest is the same as the copying grinder of the previously described embodiment shown in FIGS. 1 and 2, and the drawings and explanation thereof will be omitted.

In the figure, reference numeral 10 denotes a main shaft having a disc-shaped grinding wheel 4 attached to its end.

Further, 11 is a bearing member that rotatably supports the main shaft 10 via a bearing 13.

This bearing member 11 includes a bearing member main body 11a into which the main shaft IO is removably inserted via a bearing 13, and a bearing member supported on a grindstone support 108 with the main shaft 11a penetrated. It is composed of a support body 11b.

Then, the inside of the bearing member support 11b is scooped out, and the bearing member main body 1 is placed inside the bearing member support flb.
A coolant circulation path 14 is provided for circulating the coolant 6 so as to surround the periphery of the coolant 1a.

Further, the side wall of the bearing member support 11b is provided with a coolant inlet 15a and a coolant outlet 15b communicating with the coolant circulation path 14 inside the support.

Then, the tip of a sub-coolant feed pipe (not shown), which is provided by branching off from a part of the coolant feed pipe 206 of the previously described embodiment, is inserted into the coolant feed port 15a. It is connected by communicating with.

At the same time, the coolant circulation path 1 inside the bearing member support flb extends between the coolant outlet 15b and the coolant reservoir 200 on the surface of the copy grinder main body of the previously described embodiment.
A sub-coolant return pipe (not shown) is provided for causing the coolant 6 that has been circulated through the coolant tank 4 to flow into the coolant storage tank 200.

The profile grinding machine shown in FIG. 3 is constructed as described above.

Next, an example of its use will be explained.

While the copy grinder is in use, the coolant circulation pump 204 is operated to cool a portion of the coolant 6 that flows into the coolant reservoir 200 on the top surface of the copy grinder body through the coolant feed pipe 206. Inside the coolant circulation path 14 inside the bearing member support 11b, which passes through the bearing member main body 11a that supports the main shaft 10 of the grinding wheel 4 through a sub-coolant feed pipe provided by branching into a part of the liquid feed pipe 206. After circulating the coolant 6 in the coolant circulation path 14, the coolant 6 is passed through the coolant outlet 15b and the sub-coolant return pipe again to the coolant reservoir 20 on the upper surface of the copying grinder main body.
Try to return it to within 0.

Then, the coolant 6 circulating in the coolant circulation path 14 inside the bearing member support 11b that penetrates the bearing member main body 11a cools the bearing member main body 11a inside the coolant circulation path 14.
The main shaft 10 of the grinding wheel 4 supported by the main body can be maintained at a predetermined constant temperature state, such as 20° C.±1° C., which is the same as the coolant 6.

Therefore, due to the frictional heat generated between the main shaft lO and the bearing member main body 11a, the main shaft lO and the bearing member main body 11a
The center position of the main shaft 10 does not shift due to heating, and the main shaft 10, the bearing member main body IIa, etc. do not become distorted.

In addition, in the copying grinding machine equipped with the above-mentioned auxiliary cooling mechanism 12, a nozzle 207 is provided at the tip of the sub-cooling liquid return pipe to sprinkle the cooling liquid 6 onto the surface of the light transmitting body 8, and the tip of the cooling liquid sending pipe 206 is directly cooled. After all of the coolant 6 connected to the coolant inlet 15a communicating with the liquid circulation path 14 and sent through the coolant feed pipe 206 is circulated in the coolant circulation path 14 inside the bearing member support 11b. Alternatively, the coolant may be sprayed from the nozzle 207 at the tip of the sub-coolant return pipe, sprinkled on the surface of the light transmitting body 8, and flowed into the coolant reservoir layer 200 on the upper surface of the copying grinder body around it. .

Figures 4(a) and (b) show the inner left side of adjacent narrow grooves when narrow grooves were actually ground on the surface of workpiece 2 at a pitch of 12 mm using the copy grinding machine of the above-mentioned embodiment. Single pitch error between the sides and the difference between each step with respect to the left inner surface and bottom inner surface of the right end step when steps are formed on the surface of workpiece 2 at a pitch of 10 mm in the horizontal direction and a pitch of 2 mm in the vertical direction. It shows the cumulative pitch error of the left inner surface and the bottom inner surface.

According to the experimental results shown in FIGS. 4(a) and (b),
It can be seen that if the workpiece 2 is ground using the profile grinder of the above-described embodiment, the workpiece 2 can be ground with a machining accuracy of ±1 μm or less.

[Effects of the Invention] As explained above, the copying grinder of the present invention is equipped with a cooling mechanism to keep the copying grinder body near the light source that emits high heat cooled and maintained at a predetermined constant temperature state using a cooling liquid. Therefore, the copy grinding machine body near the light source will not be distorted by the heat generated by the light source.

Therefore, if you use the copy grinder of the present invention to grind ultra-precision mold parts such as gourds and punches, you will be able to grind the NC parts based on the data input to the NG control unit without requiring any skill. Controlled machining allows ultra-precision mold parts, etc.
Grinding can be performed with high precision of 1 μm or less.

In addition, since a cleaning mechanism is provided to continuously clean the surface of the light transmitting body covering the upper part of the light source with a cooling liquid, grinding powder from the workpiece may adhere to the surface of the light transmitting body. A part of the light from the light source passing through is not obstructed by the grinding powder, etc., and a part of the projected image of the workpiece projected on the screen using the light source is not blurred or distorted. .

Therefore, by always projecting a projected image of the workpiece to be ground on the screen clearly and accurately using the light source, and grinding the workpiece in accordance with the projected image on the screen, Workpieces can always be accurately ground with high precision and without errors.

Furthermore, in machines equipped with an auxiliary cooling mechanism, the main shaft with the grinding wheel fitted therein and the bearing member that supports the shaft are continuously cooled by the auxiliary cooling mechanism, so that during use of the copying grinder, , to accurately prevent the center position of the main shaft from being distorted or the main shaft or bearing member to be distorted due to frictional heat generated between the main shaft and the bearing member, It is possible to prevent deterioration in grinding accuracy of the workpiece due to distortion of the member.

In addition, the copying grinder of the present invention is equipped with a cooling mechanism and an auxiliary cooling mechanism to keep the copying grinder body near the light source, the main shaft and bearing members that support the grinding wheel, which are prone to distortion during operation, at room temperature. Since the machine is kept cooled to a temperature of 20'C±1℃, etc., when the copy grinder is restarted after it has stopped operation, the entire machine is raised to the same temperature as when it was in operation. Warm-up time can be greatly reduced.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view schematically showing the copy grinding machine of the present invention, FIG. 2 is an enlarged front sectional view of the vicinity of the light transmitting body equipped with a cooling mechanism and a cleaning mechanism of the copy grinding machine of FIG. 1, FIG. 3 is an enlarged front sectional view of the main shaft and bearing member of the grinding wheel of another copying grinder of the present invention, and FIGS. The experimental results when grinding a workpiece are shown. 1. Light source, 2. Workpiece, 3. Screen, 4. Grinding wheel, 5. Copy grinder body, 6. Cooling liquid, 7. Cooling mechanism, 8. Light transmitting body. 9...Cleaning mechanism, 10...Main shaft, +1...Bearing member, I2...Auxiliary cooling mechanism. Figure 2 Figure 3

Claims (1)

[Claims] 1. The workpiece is projected onto a screen using light emitted by a light source, and the workpiece and the rotating grinding wheel are relative to each other in accordance with the projected image of the workpiece projected onto the screen. A copy grinding machine that grinds a workpiece while moving the workpiece, including a cooling mechanism that cools the copy grinding machine body by circulating a cooling liquid inside and outside of the copy grinding machine body near the light source, A copying grinder comprising a cleaning mechanism that cleans the light transmitting body surface by sprinkling at least a portion of the cooling liquid circulated by the cooling mechanism onto the light transmitting body surface covering above the light source. 2. Equipped with an auxiliary cooling mechanism that cools the bearing member and the main shaft inside thereof by circulating at least a part of the cooling liquid that is circulated by the cooling mechanism inside and outside of the bearing member that supports the main shaft of the grinding wheel. A copying grinder according to claim 1.