JPH1034513A - Grinding work device for cam shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve manufacture efficiency of a cam shaft by eliminating necessity for performing work mounting, removing, moving, adjusting, etc., of a rest by man power, even when a work object is changed in a grinding work device of the cam shaft, so that a work time for supporting the cam shaft on the device can be markedly shortened. SOLUTION: On a table 3 moved in the axial direction of a supported cam shaft 2, the cam shaft 2 is supported so as to rotate with its axial center serving as the center, a rest 10 for positioning the axial center of the cam shaft 2 is set up, in a grinding work device constituted so as to grind a work part 2a of the cam shaft 2 in a condition positioned by the rest 10 by rotating a grinding wheel 7 reciprocation moved in a direction orthogonal to the axial direction of the cam shaft 2, the axial center of the cam shaft 2 is automatically positioned by a centripetal rest 10', in accordance with a form of the worked cam shaft 2, so as to move in the axial direction of the cam shaft 2 on the table 3, the rest is set up corresponding to a grinding work position by the grinding wheel 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for grinding and processing a cam portion of a cam shaft for driving a valve, which is a component of a vehicle engine.

[0002]

2. Description of the Related Art A camshaft for driving a valve, which is a component of a vehicle engine, is manufactured by further grinding a primary molded product manufactured by casting or forging.
In the grinding, as shown in FIGS. 7 and 8, the camshaft 2 is supported on the table 3 so as to rotate about its axis, and the rest fixing bolt 2
The rests 20 movably and detachably mounted on the table 3 by Oa are arranged corresponding to the respective portions to be processed (each cam portion) of the camshaft 2 and the axes of the respective portions to be processed are arranged. Adjust the center of each rest 20 adjustment bolt 2
After being positioned in advance by 0b and 20c, the table 3 is moved to sequentially send each portion to be processed as a processing portion to a grinding position, and reciprocate in this position in a direction orthogonal to the axial direction of the cam shaft 2. Conventionally, a grinding apparatus has been generally used in which the operation of cutting the processed portion by the rotating grinding wheel 7 is repeated, thereby grinding all the portions to be processed of the camshaft 2.

[0003]

In the camshaft grinding apparatus as described above, for example, as shown in FIG. 7, after a camshaft 2 for a four-cylinder engine is machined, then, as shown in FIG. As shown, a camshaft 2A for a six-cylinder engine
Often, the object to be processed is changed, such as processing, but in such a case, in the above-described conventional device, the position of the portion to be processed due to the difference in the object to be processed is adjusted according to the difference in the position. Each time, the attachment, detachment, movement, and adjustment of the rest 20 are performed manually.
Even if the rest 20 is adjusted according to the object to be machined, the machining accuracy is not obtained at one time, so that the cycle of adjustment-machining-measurement-adjustment is repeatedly performed about two to three times. Manufacturing efficiency is poor.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides, as described in the first aspect, a table which moves in the axial direction of a cam shaft which is supported.
The cam shaft is supported so as to rotate about its axis, and a rest for positioning the axis of the cam shaft is provided, and the processed portion of the cam shaft positioned by the rest is In a camshaft grinding apparatus configured to perform grinding by rotation of a grinding wheel that reciprocates in a direction perpendicular to the axial direction of the camshaft, a centripetal rest that automatically positions the axis of the camshaft. Are installed in correspondence with the grinding position by the grinding wheel so as to move in the axial direction of the cam shaft on the table according to the form of the cam shaft to be machined.

In the camshaft grinding apparatus according to the first aspect, as described in the first aspect, two centripetal rests are provided corresponding to the grinding positions by the grinding wheel. It is characterized by having been done.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a camshaft grinding apparatus according to the present invention will be described below with reference to the drawings.

FIGS. 1 to 6 relate to a camshaft grinding apparatus according to an embodiment of the present invention.
As shown in the figure, on the upper surface of the machine body 1 of the grinding machine,
A table 3 is installed so as to reciprocate in the axial direction of the camshaft 2 of the primary molded product as a processing object. On the upper surface of the table 3, the camshaft 2 is rotated about its axis. In order to support the table 3, the spindle work drive 4 and the tailstock tailstock 5 are installed near both ends in the longitudinal direction of the table 3 so as to face each other in the moving direction (longitudinal direction) of the table 3. .

On the upper surface of the machine body 1, a grinding wheel 7, a motor 8 for driving the grinding wheel 7 and a transmission belt 9 are provided.
Is mounted on one side in the longitudinal direction of the table 3 so as to reciprocate in a direction orthogonal to the direction of movement of the table 3. The grinding wheel 7 is arranged so as to be able to contact the machined portion 2a of the cam shaft 2 supported by the grinding wheel.

On the upper surface of the table 3, there is further provided a centripetal rest 10 for automatically positioning the axis of the cam shaft 2 which is supported, in accordance with the form of the cam shaft 2 to be machined. Axial direction of shaft 2 (longitudinal direction of table 3)
According to the present embodiment, two positions are provided corresponding to the processing positions at which the processing portion 2a of the cam shaft 2 is ground by the grinding wheel 7 so as to move on the table 3 via the slide 13. ing.

More specifically, as shown in FIG. 4, the table 3 has a bed 11 laid on the upper surface of the machine body 1 in accordance with the rotation direction of the table moving ball screw 12 disposed on the lower surface. Are mounted so as to reciprocate on each other, and each centripetal rest 10 is arranged on a table in accordance with the rotation direction of each rest moving ball screw 14 separately arranged with respect to the lower surface of each base 10a. 3 on the slide 13 laid on the upper surface of each centripetal rest 1
It is installed so as to reciprocate every zero.

As shown by a solid line and a dashed line in FIG. 5, each of the centripetal rests 10 has one of the centripetal rests 10 even if the diameter of the camshaft 2 to be processed is different. When the other grips 10c and 10d move in response to the movement of the grip 10b, the axis O
Such an automatic axis center positioning structure itself has been generally known in the past by a lathe rest or the like.

In the grinding machine having the above-described configuration, the camshaft 2 of the primary molded product to be machined is placed on the table 3 while being held between the main spindle work drive 4 and the tailstock tailstock 5. After being supported, the following operation is automatically performed under the control of a control device (not shown) installed in the machine body 1.

That is, first, the table 3 is mounted on the machine main body 1.
The upper part 2a of the camshaft 2 supported on the table 3 (the cam part located at the end of the camshaft 2) is moved to a position to be ground by the grinding wheel 7. Then, the movement of the table 3 is stopped.

Next, two centripetal rests 10 move on the table 3 corresponding to the form of the camshaft 2 which is the object to be machined, and an appropriate near the machined portion 2a to be machined by the grinding wheel 7. After each centripetal rest 10 stops at the position, the camshaft 2 is grasped by each centripet rest 10, and the axis of the camshaft 2 is automatically positioned at the corresponding portion, whereby the grinding wheel 7 grinds. The axis of the machined portion (cam portion) 2a of the camshaft to be machined is positioned.

Then, the grinding unit 6 moves forward and the grinding wheel 7 comes into contact with the processing portion 2a of the cam shaft, the axis of which is positioned by the respective centripetal rests 10, and the driving force of the spindle work drive 4 is further increased. According to the movement of the processing portion 2a of the camshaft 2 rotating about the axis,
When the grinding wheel 7 reciprocates together with the grinding unit 6, the rotation of the grinding wheel 7 driven by the motor 8 via the transmission belt 9 causes the outer peripheral surface (cam surface) of the processed portion (cam portion) 2a of the camshaft 2 to rotate. ) Is ground into a predetermined cam shape.

When the machining of the machining portion 2a is completed, the grinding unit 6 is moved backward, the grinding wheel 7 is separated from the cam shaft 2, and the grasp of the cam shaft 2 by each centripetal rest 10 is released. The table 3 is placed on the machine body 1 such that the portion of the camshaft 2 supported on the table 3 which is to be processed next to the processing portion 2a comes to the grinding position by the grinding wheel 7 as a new processing portion. Is further moved and then stopped, and thereafter, the above-described cutting of the camshaft 2 is sequentially repeated.

In the camshaft grinding apparatus according to the present embodiment as described above, the rest for positioning the axis of the camshaft 2 is automatically provided even when the diameter of the camshaft 2 changes. And the centripetal rest 10 is installed so as to move in the axial direction of the camshaft 2 on the table 3, and not for all portions to be machined, It is installed only on the processing portion 2a located at the grinding position by the grinding wheel 7.

Therefore, as compared with a conventional camshaft grinding apparatus as shown in FIGS. 7 to 9, for example, the camshaft 2 for a four-cylinder engine as shown in FIG. As in the case of the camshaft 2A for a six-cylinder engine, even when the object to be machined changes, there is no need to manually mount, remove, move, adjust, etc. the rest 10 each time, and the production efficiency is reduced. Will be dramatically improved.

Further, in the present embodiment, the centripetal rest 10
Are provided at two positions with respect to the grinding position (the processing portion 2a of the camshaft 2) by the grinding wheel 7, so that even if the camshaft 2 to be processed is long, the number of rests is as small as possible. Accordingly, it is possible to maintain the alignment of the shaft center in the processed portion 2a of the camshaft 2 in a stable state.

In this embodiment, the centripetal rest 10 is installed at two places. However, if the camshaft to be processed is short, the centripetal rest 10 may be installed at only one place. It is possible.

[0021]

According to the camshaft grinding apparatus of the present invention as described above, even when the object to be machined changes, the work of attaching, detaching, moving, adjusting, etc., the rest is performed by a human hand each time. Therefore, it is not necessary to perform this operation, so that the operation time for causing the apparatus to support the camshaft can be greatly reduced, and the production efficiency of the camshaft can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of an embodiment of a camshaft grinding apparatus according to the present invention.

FIG. 2 is a top view showing the entire embodiment shown in FIG. 1;

FIG. 3 is a front view showing the whole of the embodiment shown in FIG. 1;

FIG. 4 is a sectional side view showing a main part of the embodiment shown in FIG. 1;

FIG. 5 is a partially enlarged side view of a main part shown in FIG. 4;

FIG. 6 is a top view showing a state where a processing object is changed in the embodiment shown in FIG. 2;

FIG. 7 is a top view showing the entirety of a conventional camshaft grinding apparatus.

FIG. 8 is a sectional side view showing a main part of the conventional example shown in FIG. 7;

FIG. 9 is a top view showing a state where a processing object is changed in the conventional example shown in FIG. 7;

[Description of Signs] 1 Machine body (of grinding machine) 2 Cam shaft 2a Machined portion (of cam shaft) 3 Table 7 Grinding wheel 10 Centripetal rest

Claims (2)

[Claims] 1. A table which is supported on a table which moves in the axial direction of a supported camshaft so that the camshaft rotates about its axis, and a rest for positioning the axis of the camshaft is provided. A camshaft that is installed and is configured so that a processed portion of the camshaft positioned by the rest is ground by rotation of a grinding wheel that reciprocates in a direction orthogonal to the axial direction of the camshaft. In the grinding apparatus, the centering rest for automatically positioning the axis of the camshaft moves in the axial direction of the camshaft on a table in accordance with the form of the camshaft to be machined, so that the grinding wheel is used. A camshaft grinding apparatus, which is installed corresponding to a processing position. 2. According to a grinding position by a grinding wheel,
2. The camshaft grinding apparatus according to claim 1, wherein two centripetal rests are provided.