JPH01103257A - Arc form polishing machine for workpiece - Google Patents

Abstract

PURPOSE:To prevent the accumulation of ferrite powder and abrasive grains onto a cover by installing a table for installing an upward jig, guide for supporting the table, and a cover for protecting the guide in the vertical direction and installing a shielding plate over the cover. CONSTITUTION:After a standard surface consisting of a plurality of crossing flat planes is formed on the outer R surface of work 1 on an upward jig 2a, the standard surface is vacuum-adsorbed, and the inner R surface of the work and the bearing surface are grinding-worked in the state where the rightward or leftward deflection of the work is suppressed by the standard surface. Then the outer R surface is polished into arcuate form by working the outer R surface of the work and the standard surface at a same time on the upward jig 2a. In this case, a table 10 onto which the upward jig is installed, guide 12 for supporting the table 10, and a cover 21 for protecting the guide 12 are installed in the vertical direction, and a shielding plate 31 is installed over the cover 21. Therefore, the accumulation of ferrite powder and abrasive grains which are mixed into the polishing water 25 is prevented, and the breakage and abrasion of the cover 21 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a grinding machine whose purpose is to machine multiple surfaces of an arc-shaped workpiece.

[Prior Art] A general method for machining an arc-shaped workpiece 1, such as a ferrite fired body, as shown in FIG. Grinding is performed using a linear grindstone that matches the shape of surface 7, but the conventional method is to align the workpieces in a fixed direction and continuously grind them, as shown in the workpiece grinding and conveying device of JP-A-57-168858. There is a method of sending the workpiece 1 and grinding it, another method of placing the workpieces one by one on a processing jig attached to the conveyor and grinding, and another method of clamping and grinding one workpiece at a time. Method: Put the workpiece 1 into a processing jig 2 with a plurality of partition plates 4 as shown in Fig. 7, rotate the linear grindstone 3 in the direction A, and move the processing jig 2 in the direction B. There are methods such as grinding. At this time, the machining distance is approximately 1.5m+, which is heavy grinding, and a large amount of grinding water 25 is pumped through the nozzle 24 in order to cool the grinding wheel 3 and dispose of the removed ferrite powder and the abrasive grains that have fallen off the grinding wheel 6. Machining while spraying 0 Among the conventional machining methods described above, the method of continuously feeding and grinding is the most efficient, but the method of machining by clamping one piece at a time has the best machining accuracy. The machining efficiency is close to the method of continuous feed machining, and the machining accuracy is close to the method of clamping and grinding one piece at a time, as shown in Figure 7, where the workpiece is placed in a jig with multiple partition plates. This is the way to do it. To explain this method in detail, a workpiece 1 is placed on a processing jig 2a shown in FIG.
After grinding with
The surface 5 is attracted by a vacuum device 122, and the inner R surface and the seat surface 7 are simultaneously ground by a linear grindstone 3b.

FIG. 16 shows a sectional view of the grinding machine.

[Problem that the invention seeks to solve]

In the conventional machining method described above, in the method of continuously feeding and grinding, the workpiece 1 is moved in its entirety with a force greater than the grinding resistance while bringing the workpiece 1 into contact with the next workpiece 1.
Then, the corner of the contact part of the next workpiece 1 is chipped, and the workpiece 1 may be oriented sideways during the feeding movement, although it is very difficult to do so. In addition, the removed ferrite powder and fallen abrasive grains cause wear on the guides that come into contact with the workpiece 1. Therefore, there are large variations in dimensional accuracy after machining.

The method of feeding by a conveyor also has a complicated structure, the rotating sliding part wears out quickly, the dimensional accuracy after processing decreases, and it is not preferable from the viewpoint of maintenance and setup time.

In addition, the method of clamping and grinding the workpiece 1 one by one has good dimensional accuracy without chipping, but it takes time to attach and detach the workpiece 1, resulting in poor production efficiency. The sliding part is worn out, and workpiece 1
You will not be able to set it reliably.

Next, in the method shown in FIGS. 7 and 9, there is nothing to restrict the rotation in the arc direction when the outer surface 5 is vacuum-suctioned, and the workpiece 1 may be misaligned when it is suctioned, and the grinding wheel 3b may be uneven on the left and right sides. Due to differences in grinding resistance caused by wear, workpiece 1
moves in the direction of arrow X shown in Figure 10a or in the direction of arrow Y shown in Figure 10S, causing a shift, and the dimensions shown in Figure 10 become Hl > H, h, > h. The disadvantage is that they are different. Further, in this conventional grinding machine, as shown in FIG. 16, a sliding table 10 and a guide 12 are mounted on a horizontal surface, and a cover 21 is provided to protect the guide. In this case, the method of covering is the bellows 26 shown in FIG.
There is a method using a slide type cover 27 shown in FIG. . As a result, as shown in FIG. 11, ferrite powder and abrasive grains 3
6 accumulated and the bellows 26 expanded and contracted, causing damage! 0, l! As shown in FIG. 12, the wiper 28 is worn out by the ferrite powder 23 and abrasive grains 66 accumulated at the end of the sliding cover 27, and the ferrite powder 26
The abrasive grains 36 enter the cover 21 together with the grinding water 25,
The sliding parts of the guide 12 are likely to wear out. Further, if the ferrite powder 26 and the abrasive grains 36 dry and adhere to the cover 21, there is a drawback that the movement of the cover 21 becomes difficult.

This invention 1J11#iAs mentioned above, in the method of grinding by placing the work in a processing jig with the first number of partition plates,
The purpose is to provide a grinding machine that can process the inner and outer R surfaces and the left and right bearing surfaces with good dimensions and high efficiency, prevent ferrite powder and abrasive grains from entering the cover, and extend the life of the guide. shall be.

[Means for solving problems]

In the present invention, three processing jigs with a plurality of partition plates are attached to separate sliding tables in a straight line in the order of upward, downward, and upward, and the downward-facing jig is attached to the vacuum of the workpiece. In a grinding machine that processes an arc-shaped workpiece that is configured to be able to suction and move up and down, in the first step, the outside of the workpiece is A reference surface, which is a plurality of intersecting planes, is formed on the R surface, and in the second step, the inner R surface and the left and right bearing surfaces are ground using a jig that vacuum suctions the reference surface. The outer R surface is ground using a jig that uses the processed inner R surface or the left and right bearing surfaces as a reference for processing.

Furthermore, by mounting the table and kite on which the upward-facing jig is attached, the cover that protects the guide is also mounted vertically, and a shielding plate is provided above the cover. Function] In this way, in the first step, a reference surface, which is a plurality of intersecting planes, is formed on the outer R surface of the workpiece, and in the second step, the inner R surface and the seat surface are formed using a jig that vacuum-chucks the reference surfaces. By grinding, it is possible to stop the force that causes the workpiece to shift from side to side on the reference surface.

In addition, by mounting the table, guide, and cover vertically and providing a shielding plate above the cover, ferrite powder and abrasive grains mixed in the grinding water are not likely to accumulate on the cover, and are washed away by the grinding water. It becomes easier.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a grinding machine according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line AA and line C-C in FIG. 1, and FIG. 3 is a cross-sectional view taken along line B-B in FIG. It is a diagram.

First, the configuration of a grinding machine according to an embodiment of the present invention will be described.

In FIG. 2, a sliding table 10a.

Processing jigs 2a and 2c are placed facing upward on 10c, and a guide 12 is fixed on the vertical surface of the frame 19.
a, 12c, and the motors 11a, 11 in FIG.
It is moved left and right by ball screws 13a and 13c driven by c. Covers 21a and 21c for protecting the guides 12a and 12c are installed in positions retracted from directly below the grindstones 5h and 5c, and the covers 21a and
21c is also installed vertically so that the grinding water can easily flow and diamond abrasive grains and ferrite powder do not accumulate.

The grinding wheels 3a, 3c are rotated by motors 18a, 18c via spindles 17a, 17c, and the ball screws 16a, 1 are rotated by separately attached motors 15a, 15c.
6c etc., it is possible to move up and down in the vertical direction.

In addition, in FIG. 6, a jig 2b is attached downward to the lower side of a sliding table 10b, and a ball screw 1 is guided by a guide 12b and driven by a motor 11b shown in FIG.
The grinding wheel 3b, which is slid left and right by the grinding wheel 3b, is rotated by a motor 18b via a spindle 17b, and can be moved up and down by a separately attached motor 15b using a ball screw 16b or the like. Further, the jig 2b capable of vacuum suctioning the workpiece 1 can be moved up and down by a cylinder 14 attached to a slide table 10b.

Next, the operation of machining an arc-shaped workpiece will be explained with reference to FIGS. 4, 5, 6, and 7 in conjunction with the previous figures. In Fig. 4, a is an explanatory diagram showing the first step, b is the second step, and C is the third step. Fig. 5 is a reference plane that is a plurality of planes that intersect with the outer R surface 5 of the workpiece 1 in the first step. Figure 6 is a perspective view of the processing jig 2 used in the M1 process, and Figure 7 is when the work 1 is placed in the processing jig 2 and being processed. It is an explanatory diagram showing a state.

First, the handling device 20a sets the workpiece 1 at another position, grips or suctions it from a temporary jig (not shown), sets the jig 2aK for processing in the first step, and sets the workpiece 1 on the table. By sliding 10a in the direction of the grindstone 3a, the end surface 9 of the workpiece 1 is pressed by the partition plate 4 of the jig 2 and is ground one after another. At this time, if the grindstone 3a is formed into a V-shape, a partially flat portion will be formed only at the ground portion of the outer R surface 5, and a reference surface 8, which is a plane for positioning in the second step, will be formed.

Next, after aligning the center of the processing jig 2b for the second step with the center of the processing jig 2a for the first step, it is lowered onto the jig 2a and vacuum sealed! While adsorbing the reference surface of the workpiece to the lower part of the jig 2b at 22, as shown in FIG. Also, the seat surface 7 is ground at the same time. At this time, the reference surface 8 formed on the outer R surface of the workpiece 1 with the jig 2b
Since the same angle α as shown in FIG. The left and right sides are processed equally.

After completing the second process, align the centers of the machining jig 2b and the third process machining jig 2c, lower the jig 2c onto the jig, release the vacuum suction, and place the workpiece 1 on the jig. Set to 2c. After that, slide the table 10c and
Using the surface 6 and the seat surface 7 as references, the outer R surface 5 and the reference surface 8 are simultaneously processed using the grindstone 3c, and the outer R surface is ground into an arc shape to complete the processing.

After processing, the workpiece 1 is separated from the jig 2c by the handling device 20c by gripping or vacuum suction.

In addition, the same effect can be obtained even if the number of reference surfaces formed on the outer R surface of the workpiece 1 in the first step is increased as shown in FIG. 5 in order to increase the suction area in the second step. .

Next, the table 10a of the grinding machine described above.

10c, guides 12a, 12c, covers 21a, 21c
The structure of the mounting portion will be explained with reference to FIG.

Table 1 on which processing jigs 2a and 2c are placed facing upward
0a and 10e are 0 guides 1 guided left and right by guides 12a and 12c attached to the vertical surface of the frame 19.
2a, 12c and covers 21a, 21e are grinding stones 3a
, 3c, and the covers 21a and 21c are provided with wipers 28 as shown in FIG. 12. The covers 21a and 21c are supported by shoes 2 to support their own weight and external forces in the front and rear directions.
9 and the rail 30 attached to the frame 19.
slide along.

For this purpose, a horizontal part 9 is required at the top of the covers 21a and 21c, and a shield plate 61 is provided to prevent the grinding water 25 mixed with diamond abrasive grains 22 and ferrite powder 23 from directly splashing on this horizontal part.

Air 63 may be injected from the back side of the shield plate 31 by the air supply device 32, and cleaning water 65 may be flowed downward from the upper front surface of the shield plate 31 by the wash water supply device 64. This is effective in preventing intrusion of grinding water mixed with abrasive grains 66 and ferrite powder 23, and in washing away deposits on the vertical surfaces of covers 21a and 21c.

In a normal grinding machine, as shown in Fig. 14, the table 10 is longer than the stroke of the table 10, so all of the grinding water can be collected by the plate 37 attached to the table, making it easy to protect the guide 12. However, when machining multiple surfaces of the arc-shaped workpiece according to the present invention, multiple sets of grindstones and tables are required, and the workpiece must be transferred, so the stroke of the table becomes long.
Furthermore, since the installation space of the grinding machine must be minimized, the length of the table must be kept as short as possible, so it is not possible to collect the grinding water on the table like a normal grinding machine. Since this is not possible, the structure described above is used.

Note that the guide and cover may be tilted as long as the flow of grinding water is improved and the ferrite powder and abrasive grains do not reach t4.

〔Effect of the invention〕

As described above, according to the present invention, a reference surface, which is a plane where the paper numbers intersect, is formed on the outer R surface of an arc-shaped workpiece, and a jig is used to vacuum suck the reference surface. By grinding, it is possible to stop the force that causes the workpiece to shift from side to side, so that the dimensions and shapes and circular arcs of the left and right seating surfaces can be ground symmetrically and with high dimensional accuracy. Table 1 shows a comparison of the dimensional accuracy and takt time of workpieces after machining in the conventional machining method and the machining method according to the present invention.

Machining method - ■ is the conventional method in which the machiner feeds the workpiece continuously, ■ is the method in which the workpiece is clamped one by one, and ■ is the method in which the workpiece is placed in a jig with multiple partition plates. Processing method (2) is a processing method according to the present invention. FIGS. 16 and 17 are diagrams showing the shape of the workpiece after machining, and FIGS. 18 and 19 are diagrams showing the method for measuring the squareness. To measure the squareness, first place the master gauge on the V block 38 and hit it against the stopper 39, and after adjusting the reading of the tire gauge at that time to zero, place the work 1 on the V block 38 as shown in Fig. 18. The dial gauge reading when placed with the inner 8 surfaces 6 facing upward and abutting against the stopper 39 is taken as the perpendicularity. Compared to the conventional machining method shown in Table 1, by using the machining method according to the present invention, the machining accuracy can be reduced to 1.
It is possible to perform highly efficient machining with high accuracy and short takt time, which is similar to the method of clamping one piece at a time.

Table 1 In addition, by mounting the table, guide, and cover vertically and providing a shielding plate above the cover, ferrite powder and abrasive grains mixed in the grinding water are difficult to get onto the cover, and the grinding Since it is easily washed away by water, damage and wear on the cover can be prevented, extending the life of the guide.

[Brief explanation of the drawing]

FIG. 1 is a front view of a grinding machine according to the present invention, FIG. 2 is a sectional view taken along lines AA and CC in FIG. 1, FIG. 3 is a sectional view taken along BB in FIG. 1, and FIG. An example of the processing method according to the present invention, FIG. 5 is a perspective view of the workpiece after reference surface processing, FIG. 6 is a perspective view of the processing jig used in the first step, and FIG. 7 is an explanatory diagram during processing. , FIG. 8 is a sectional view of the table and guide attachment part of the grinding machine according to the present invention, FIG. 9 is an example of a processing method related to the conventional grinding method, and FIG. 10 shows problems with the conventional grinding method. Explanatory diagram: The 11th cause is an explanatory diagram of the problem with bellows in a conventional grinding machine. Figure 12 is an explanatory diagram of the problem with the sliding cover in a conventional grinding machine. Figure 13 is a cross section of a conventional grinding FSlj machine. Figure 14- is an explanatory diagram of a normal grinding machine, Figure 15 is a perspective view of an arc-shaped workpiece, Figure 16 is a diagram showing the shape of the workpiece after machining, and Figure 17 is the E-E cross section of Figure 16. 18 is an explanatory diagram of the squareness measuring method, and FIG. 19 is a plan view of FIG. 18. 1: Workpiece 2: Jig 3; Grindstone 4: Partition plate 5: Outer R surface 6; Inner R surface 7; Seat surface 8; Reference surface 10; Table 12; Guide 21; Cover 22; Vacuum device 23; 7 Elite powder 25; Grinding water 26: Bellows 27; Sliding cover 28; Wiper 31; Slanted surface 1 Figure] Uc, I Ucl t (1, l, etc. 4 Figure α b c Figure 5 α b 6 Figure 17 Figure '$8 Figure 9 α b Figure 10 Figure 11 Figure 12 Figure #13 Figure 14 Figure 15 Figure 116 Figure 17, 8゜ Figure 19

Claims (1)

[Claims] 1. A plurality of processing jigs containing a plurality of partition plates are attached to separate sliding tables in a straight line in the order of upward, downward, and upward, and the downward-facing jigs are attached to the workpiece. In a grinding machine that processes multiple surfaces of an arc-shaped workpiece, the grinding machine is configured to be able to vacuum suction and move up and down.In the first step, a reference surface, which is a plurality of intersecting planes, is formed on the outer R surface of the workpiece, and in the second step, In the third step, the reference surface is vacuum suctioned and the inner R surface and the seat surface are ground, and in the third step, the outer R surface is ground to protect the table on which the upward facing jig is attached, the guide that supports it, and the guide. A grinding machine for arc-shaped workpieces, characterized by having a cover mounted vertically for the purpose of grinding, and a diagonal plate provided above the cover. 2. In claim 1, the first step is a processing jig that uses the left and right seating surfaces of the workpiece as a reference for processing, and the second step is a plurality of intersecting planes formed on the outer R surface in the first step. The third step has a jig that vacuum-chucks a reference surface and uses that reference surface as a reference for processing, and the third step has a jig that uses the inner R surface or seat surface processed in the second step as a reference for processing. A grinding machine for arc-shaped workpieces.