JPS58155159A - Centerless grinder for angular grinding - Google Patents

Abstract

PURPOSE:To optimize the dressing ratio between the peripheral surface and the end by setting the feed direction of a dressing diamond tool and a grinding wheel at an equal and acute angle to the axis of the respective grinding wheel. CONSTITUTION:It is so arranged that the angle phi is made accute between the feeding direction A of a diamond tool 6 and the axis GH of a grinding wheel 3 while that made equal between the feeding direction F of a dressing wheel 2, namely the feeding direction thereof to a ground work and the axis GH. As the tool 6 is fed in the direction A, the node 9 between a generating line 3a and 3b on the conical surface of a grinding wheel moves along the line L and the angle theta between the generation 3a and the axis GH gives lambda>theta. When the tool 6 advances in the direction A, the dressing ratio between the conical surface 3a and the conical surface 3b for grinding the end is expressed by coslambda/sinlambda=cotlambda. This is smaller than the conventional type and the paper selection of lambda enables the obtaining of the dressing ratio economically optimum.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an angular grinding machine that grinds the cylindrical outer circumferential surface of a workpiece while simultaneously grinding the end surface orthogonal thereto.
This relates to non-grinding machines.

FIG. 1 shows the principle and structure of angular grinding in conventional example 6 non-grinding machine. l is temporary processing nose, 2 is polishing grindstone, 3 is @
It is a grinding stone.

1a is the cylindrical outer circumferential surface of the workpiece $1, and 1b is the end surface to be angularly ground simultaneously with the cylindrical outer circumferential surface 1a.

In order to simultaneously process the above-mentioned cylindrical outer circumferential surface 1a and end surface 1b by angular grinding, the mother stock of the cylindrical outer circumferential surface 3a of the grinding PIIJ grindstone 3 and the conical surface 3b for grinding the end surface.
The workpiece 2 is fed 5 times as indicated by the arrow F' to perform angular grinding 01. Conventionally, the direction F' is generally a grinding wheel.

The grinding wheel 3 is installed at an angle with respect to the axis GH of the stone 3. ◎Furthermore, since the position of the rack in the direction of the shelf center GH between the workpiece 1 and the grinding wheel 3 is constant, the grinding wheel 3 There is no need to move the workpiece 1 in the eccentric direction J- even if the workpiece 1 is worn out.

Therefore, even workpieces having profiles such as steps and grooves can be completely angularly ground.

In order to dress the grinding wheel 3, conventionally, a diamond tool 6 is generally attached to the quill 7 so as to cut in the direction of the arrow N', which is a negative angle to the center of the grinding wheel 3. Conical surface 3 that grinds the outer peripheral surface of the workpiece
A thread 8 (a dressing device so that it can be fed in the A direction) is configured, which runs in the direction of arrow B, which is half a line from a, and which is half a line from the circular surface 3b that grinds the end surface of the workpiece.

Yame's example IL configured like this? The following is a consideration of the wear and tear of the grinding wheel for the non-grinding HLJ machine.

That is, when the diamond tool 6 is used to dress the grinding wheel 3, the circular surface 3a for grinding the outer peripheral surface of the broken proboscis 41 of the grinding wheel 3 is hypothetical, as shown in (3a), and the workpiece The conical surface 3b that grinds the end surface of the object wears out as shown by the imaginary line (3b).

Next, considering the rate of wear of the conical surfaces 3a and 3b, when dressing the diamond tool 6 by cutting a dimension l in direction 1 as shown by the arrow, the dressing ## of the conical surface 3a will be /CO5θ9circle3b The surface of the face is
It becomes sin θ.

Therefore, the ratio of the amount of dressing on the conical surface 3a to the amount of dressing on the circular surface 3b [, cos θ/sin θ two cot θ
becomes.

However, θ is 1/1/of the apex angle of the conical @ grinding wheel 3.
It is 2.

Due to the constraints of the nature of essential heat grinding, the angle θ is approximately 10° at most, and becomes cotloo-57, and the circle iI+ of the grinding wheel 3! When attempting to dress the surface 3b'z, it is necessary to dress the conical surface 3ak approximately 5.7 times as much. This means that more dressing is required than the 3a Kimbian tomb in Engon-myeon, making it extremely inconsiderate.

The present invention has been made in view of the above points (2), and the grinding wheel is
A conical surface dressing for grinding the outer peripheral surface of a workpiece,
The present invention provides a heat-required grinding machine for angular grinding in which the ratio of the dressing load to the conical surface for end face grinding that is attached to the conical surface can be arbitrarily set to an economically optimum head.

That is, in the present invention, when the cutting direction of the diamond tool for dressing is N, and the direction of cutting with the grinding wheel shining on the workpiece is F, the angle formed between the above direction AIJ and the axis of the grinding wheel is , gl angle, and direction 1uJ A and direction I
[Tsukasa F and Ken 01] The special iron is to make the angles of the whetstone equal.

Next, an embodiment of the present invention will be celebrated with reference to Figure @2.

The direction A into which the diamond tool 6'kLj'J enters is made with the fine GH of the grinding wheel 3 - making it a fully acute angle. Specifically, in the triangle formed by the above-mentioned cutting direction arrow A, the axis GH, and the mother of the grinding wheel 3a, there are four rivers of the bird's-eye shape between the side in the direction of the arrow N of the upper grain pi and the meticulous GH. Make φ an acute angle. In addition, the direction F111 in which the adjusting grindstone 2 is fed and the direction in which cutting is performed for grinding are equally distributed with respect to the cutting wheel 1111.

As described above, one groove direction N of the diamond tool 6
How to feed the grinding wheel 2 1 o I F or grinding is the axis of the stone, +') The head of the dressing means is turned so that the cutting direction of the diamond sole becomes φ, and the entire grinding wheel including the dressing device, the cutting for the grinding wheel and the grinding MIJ. Color) 51ol F and eggplant meat will also be φ, so it will be composed of an SLJ board that is oriented toward I.

Since the pupil of the present invention is constructed as described above, when the diamond tool 6r is cut in the N direction of the arrow in the dressing operation, the generatrix 3a of the grinding wheel 30-yen surface is as shown in the imaginary line (3a') ( , the parent line 3b wears out as (3b')<(fc, and the intersection 9 of both parent lines becomes 4@ along the marriage line.

mother#! If the river sound λ formed by 3b and the above dL is
1r is set to an acute angle, so when the diamond tool 6 is cut by a dimension l in the direction of the arrow N at an angle o where the angle λ>angle θ, the dressing acid on the conical surface 3a of the grinding wheel 3 is l.
cosλ, and the dressing of the conical surface 3b for 4i surface grinding becomes 1s1rlλ.

Therefore, the dressing sound of the circular surface 3a and the conical surface 3b for end face grinding are
The ratio of the dressing acid to a cosλ/sinλ= co
tλ. Since λ>θ is established, the ratio cotλ of dress wearing in the present invention is clearly smaller than the ratio cotθ of dress wearing in the above-mentioned Juto system.

The required ratio can be set by changing λ to a certain value.

Next, the present invention can also be applied to the case where the conical angle of the stone is 4, that is, when the grinding wheel is cylindrical.

FIG. 3 shows a grinding machine with a grinding wheel 3' having a cylindrical shape. In such a concentrated acid, since the beak engagement degree in the fine direction between the workpiece 1 and the grinding wheel 3' is not -W, the end face 3b' of the grinding wheel 3' is 3b shown by the imaginary line by dressing. If the workpiece is moved backward as shown in the figure 1', the inconvenience is that the workpiece must be moved in the axial direction as shown in the figure 1', or the grinding wheel must be moved to the position of the workpiece. There is. If the workpiece has a profile, how to move it in the fine direction? It is necessary to change the position of the profile of the 11P circumferential grinding wheel for the non-curing grinding blade (not shown) or the profile of the grinding wheel.

FIG. 4 shows Application Example 1 in which the present invention is applied to a 6-grindless machine using a cylindrical grinding wheel. The constituent members other than the grinding wheel 3' are the same as in the center example of Figure t42. 16 in Fig. 44 also has the effect that the angle λt- can be arbitrarily set so that the aforementioned dressing ratio cotλ is an economical value, and the wear and tear of the corner 9' of the grinding wheel is reduced. (line L' and the arrow F in the cutting direction of the workpiece 1 to be cut for the workpiece 8u, or the cutting direction arrow F or the grinding slJ *Since it is at an equal angle to the fine grain GH of the stone, As with conventional grinding machines using cylindrical grinding wheels, the grinding wheels wear out.

There is no inconvenience of having to move the work piece 1 in the direction of the machine center, and by cutting in the direction of arrow F, the outer cylindrical surface 1a and the end face 1b of the work piece can be ground 1+
It is possible to carry out angular grinding td4 of the workpiece 1 by using the III grindstone 3', regardless of the wear of the cylindrical grindstone 3'.

As explained above, in the present invention, the cutting direction N1r of the diamond tool is set at an acute angle with respect to the axis of the grinding wheel, and the cutting direction F of the grinding wheel is set in the above direction to the fineness of the grinding wheel 11. By making both of them equal, the ratio of the dressing acid of the conical surface for grinding the outer peripheral surface of the workpiece of the rigid grinding wheel and the dressing acid of the conical surface for end face curvature perpendicular to this can be set to an economically optimal value. It has an excellent practical effect of being able to determine the amount of money you need.

[Brief explanation of drawings]

Fig. 1 is a plan view of a conventional type 6 non-grinding machine, Fig. 2 is a plan view of a 6 non-grinding machine for angular grinding according to an embodiment of the present invention, and Fig. 3 is a complete series of cylindrical grinding wheels. Figure 4 is a plan view of a non-grinding machine for angular contact grinding according to an example of the present invention. 1.1'...workpiece, 2...L! 4 Nawate 6.3,
3'... Grinding wheel, 6... Diamond tool, 7
...Tile, 8.8'...dressing pupil. Patent applicant: Masami Akimoto, patent attorney representing Micron Seimitsu Co., Ltd.

Claims (1)

[Claims] The cutting direction of the diamond tool for dressing on the hot #F hard disk for angular grinding, which simultaneously processes the cylindrical outer circumferential surface and end face of the workpiece using the outer circumferential surface of the grinding wheel and the surface perpendicular to the grinding wheel. When iA is the direction iF in which the grinding wheel cuts into the workpiece, the above direction N
6 Non-grinding for angular grinding where the angle made with the axis of the grinding wheel is an acute angle, and the angles made by the above directions N and F with the axis of the grinding wheel are made acute angles. Board.