JPS62282854A - Grinding method in double head surface grinding machine - Google Patents

Abstract

PURPOSE:To grind both end faces so accurately with a machining allowance distribution corresponding to various grinding conditions, by stopping rotation of a first grinding wheel, while at the same time rotating a second grinding wheel, giving it feed, and grinding one side of a workpiece, then stopping rotation of this second grinding wheel, while rotating the first grinding wheel, giving it feed, and grinding the other side of the workpiece. CONSTITUTION:In the state that a first grinding wheel 1 stops its rotation, feed is given to a second grinding wheel 2 in the axial direction while rotating it, and the grinding allowance S2 at one side S2 W is removed with rough grind. Next, rotation of the second grinding wheel 2 is stopped, and the first grinding wheel 1 is rotated whereby grinding allowance S1 at the other side B of the workpiece W is removed with rough grind while giving feed to the second grinding wheel 2. In addition, fine feed is given to these first and second grinding wheels 1 and 2 while rotating them and thereby each finishing allowance, T1 and T2, of both end faces A and B is removed at the same time with finish grind. Therefore, both these end faces A and B of the work-piece W different in the grinding allowance can be accurately ground as far as a portion for the specified grinding allowance in a highly accurate manner.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a grinding method using a double-head surface grinder that grinds both end faces of a workpiece with high precision.

[Prior art]

The grinding method of a double-disc surface grinder that grinds both end faces of a workpiece is to rotate each wheel in different directions or in the same direction, and to give feed to one of the wheels to grind the workpiece. A common method is to simultaneously grind both end faces. However, even if the rotational speed of both grinding wheels is made the same and the same type of grinding wheels are used, in reality, there may be differences in the cutting edge of the grinding wheels due to grinding wheel wear, clogging, or blindness, etc. Currently, there is a difference in the way the grinding fluid is applied, resulting in a difference in grinding performance between the two grinding wheels. Therefore,
When grinding both end faces of a workpiece at the same time, the machining allowance (thickness removed) on both end faces will not be uniform, resulting in excessive machining allowance on one end face, shortening the life of the grinding wheel, and damaging the workpiece. Not only does it cause grinding cracks and thermal distortion, but also the precision of flatness and parallelism? -# Press the f button to access small shrines -Top-Sc 1.
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A double-headed surface grinder that distributes and grinds the same amount of machining allowance from both end faces is disclosed in Japanese Patent Publication No. 51-19197 and Japanese Patent Publication No. 57-54.
It is disclosed in the specification of No. 273, and the former gives the same amount of feed based on the position where the grinding wheel touches both sides of the workpiece,
This is a grinding machine designed to remove the same amount of machining allowance on each wheel, and the latter is designed to grind the machining allowance on both sides of the workpiece equally by aligning the center plane between the two wheels with the center plane of the workpiece. It is a grinding machine made of However, even if both end faces of the workpiece are the same shape (the area or shape of the corrugated surface is the same), as mentioned above, there will be a difference in grinding performance between the two grinders and the wheel, so the machining allowance on both end faces will be The method of equally distributing and grinding cannot be said to be the best method for a double-head surface grinder that performs precision grinding. If both end faces of the workpiece are not the same shape as shown in Figure 3, distributing uniform machining allowance to both end faces will actually lead to unevenness in the grinding performance of both grinding wheels, which will have a negative impact on machining accuracy. Sometimes. As countermeasures to compensate for the shortcomings of the conventional technology, there are methods such as using two surface grinders to grind one side at a time, and after grinding one end surface, grinding the other end surface using a reversing device, etc. The man-hours and costs involved will increase.

[Purpose of the invention]

In view of the shortcomings of the prior art, the present invention provides a grinding method using a double-head surface grinder that grinds both end faces of a workpiece with high accuracy by distributing stock removal according to various grinding conditions.

[Means of invention]

The present invention provides a pair of grinding wheels arranged opposite to each other.
．． 2) In the meantime, the first grinding wheel 1 was stopped rotating in a double-headed surface grinder for grinding both end surfaces A and B of the workpiece W while facing the workpiece W held by the workpiece holder 3. In this state, the second grinding wheel 2 is rotated, feed is given to the grinding wheel to grind one end surface A of the workpiece W, and then the rotation of the second grinding wheel 2 is stopped and the first grinding wheel is rotated. This grinding method for a double-head surface grinder is characterized in that the other end surface B of the workpiece is ground by avoiding rotation of the grinding wheel I and giving feed to the grinding wheel.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. Figure 1 shows
The main parts of the double-head surface grinder are shown in Figure 2 (a).
1, (b) and (c) are explanatory diagrams showing the grinding process at @. The workpiece W held by the workpiece holder 3 is placed between the first grinding wheel 1 and the second grinding wheel 2, and as shown in FIG. With the rotation of the grinding wheel 1 stopped, the second grinding wheel 2 is rotated and fed in the axial direction of the grinding wheel to remove the grinding allowance S on one end surface A of the workpiece W by rough grinding. Next, (b) as shown in the figure, the rotation of the second grinding wheel 2 is stopped, the first grinding wheel 1 is rotated, and the workpiece is cut while giving feed to the second grinding wheel 2. The grinding allowance Sl on the other end surface B of W is removed by rough grinding. Next, (C) as shown in the figure, the first grinding wheel 1 and the second grinding wheel 2 are not rotated but are given slow feed, so that each of the both end surfaces (A, B) of the workpiece W is Finishing charge T
2 and T are simultaneously removed by soil grinding. As described above, in the conventional method of grinding both end faces at the same time, the grinding allowance S1
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This makes it possible to accurately grind both end faces of a workpiece with different grinding allowances by a predetermined grinding allowance. Figure 3 shows the grinding allowance a of a workpiece W1 whose machined surfaces A, B, are not the same shape.
, b are different. The end surfaces A1 and B1 of such a workpiece are each provided with an optimal machining allowance in consideration of the quality control of the workpiece and the machining performance of the grinding machine, etc., and are not necessarily equally divided. If the grinding allowance for the A1 side is a, and the grinding allowance for the B2 side is b, then the second
According to the order of steps shown in the figure, (a) first remove the grinding allowance a on the A1 side in the grinding process shown in the figure, then (b) remove the grinding allowance a on the B1 side in the grinding process shown in the figure, and then After completing the rough grinding of both sides, both sides of the workpiece W1 are finished by simultaneous grinding in the grinding process shown in FIG. (c) Since the finishing allowance in the finishing process shown in the figure is very small, the distribution of the finishing allowance between sides A2 and B is not a problem. The double-head surface grinder is equipped with a feed device (not shown), and by setting the feed amount corresponding to the grinding allowance on both sides of the workpiece, the finishing process of a given figure can be omitted if necessary. good.

In the embodiment, grinding was performed by giving feed to the second grinding wheel, but it may be possible to perform grinding by giving feed to the first grinding wheel.
Alternatively, the same effect can be obtained by performing grinding by feeding both the first and second grinding wheels.

〔Effect of the invention〕

With the conventional grinding method of simultaneously grinding both end faces of a workpiece using a double-head surface grinder, it was impossible to distribute the machining stock on both end faces of the workpiece. Because machining allowance can be removed accurately,
This not only improves the precision of flatness, parallelism, and surface roughness, but also extends the life of the grinding wheel. If two grinding machines are used to grind one side of a workpiece, or one grinder is used to grind one end face and then the workpiece is turned over and the other end face is ground, equipment and equipment are required. However, since the present invention does not require such a thing, it is also excellent in economical efficiency.

[Brief explanation of the drawing]

Figure 1 shows the main parts of a double-head surface grinder. FIG. 2 is a diagram illustrating the grinding process according to the present invention. FIG. 3 shows an example of a workpiece in which the corrugated surfaces on both end faces are not of the same shape. 1...First grinding wheel 2...Second grinding wheel 3...Workpiece holder W...Workpiece S.

Claims (2)

[Claims] (1) In a double-headed surface grinder that grinds both end surfaces of a workpiece, the workpiece held in a workpiece holder is faced between a pair of grinding wheels installed opposite each other, and the first grinding With the grinding wheel stopped rotating, a second grinding wheel is rotated and feed is given to the grinding wheel to grind one end surface of the workpiece,
Next, the rotation of the second grinding wheel is stopped, the first grinding wheel is rotated, and the grinding wheel is fed to grind the other end surface of the workpiece. How to grind a disc. (2) After grinding each end face of the workpiece, both grinding wheels are rotated, feed is given to the grinding wheels, and both end faces of the workpiece are finish-ground at the same time. A grinding method using a double-head surface grinder according to item (1).