JPH01159164A - Copy grinding device - Google Patents

Abstract

PURPOSE:To automatically copy-grind a work to the shape of a master cam by installing the first slide base which can be moved in the longitudinal direction, maintaining the contact between a copying roller and a master cam and the contact between a grindstone and the work, and by installing the second slide base for adjusting and setting the relative position between the grind wheel and the copying roller. CONSTITUTION:A master cam M is installed onto a shaft on the first slide base 11, and said master cam M and a copying roller 41 are attached, and the position of the second slide base 2 is adjusted and set so that the position of the peripheral edge surface of the master cam M at the contact position of the master cam M and the copying roller 41 and the peripheral edge of a grinding wheel 32 coincide with each other. Then, a work W is installed onto the shaft, and the first driving mechanism 14 is driven, and the first slide base 11 is moved in the longitudinal direction, maintaining the contact of the work W and the grinding wheel 32, accompanied with the revolution of the work W, and the work W is ground. In this case, the advance of the first slide base is suppressed by the contact of the master cam and the copying roller, and the stock removal for the work is determined according to the shape of the master cam which is revolved at the equal phase angle to the work.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a profile grinding device for grinding and finishing the peripheral edge of a plate cam having an arbitrary shape.

Conventional technology Plate cams that do not require very high precision are made by cutting the material into a predetermined shape using a fusing machine with a numerical control device such as a laser beam processing machine, and then surface hardening the material. It can be easily manufactured by doing this and roughly grinding the peripheral edge.

Assuming that the workpiece can take any shape, the grinding machine used in such a case must be equipped with a so-called copying device. Therefore, conventional grinding machines equipped with a copying device read the shape of the mask, and based on that data, the grinding wheel is configured to move back and forth relative to the workpiece, accurately copying the shape of the mask onto the workpiece. Generally, it is ground like this.

In addition, a method is widely used in which material is removed with a fusing machine or the like with the highest precision possible, and the finishing allowance, which is extremely small, is removed by manual grinding using a simple rotary grindstone.

The problem that the invention aims to solve is that when using the conventional technology, if a grinding machine with a copying device is used, the grinding machine is extremely complicated and expensive, so it is difficult to find a balance with the added value that can be obtained. This inevitably led to the problem that it was difficult for small and medium-sized enterprises with small production volumes to implement the system. In addition, if it were done by hand, it would require a great deal of skill to finish it into a predetermined shape, which often led to the problem that high-efficiency production could not be carried out by unskilled workers.

Therefore, in view of the actual state of the prior art, an object of the present invention is to provide an automatic machine that can easily perform automatic grinding work of a workpiece by simply setting a master cam and a workpiece, but whose configuration is extremely simple. Another object of the present invention is to provide a new profile grinding device.

Means for Solving the Problems The structure of the present invention to achieve the above object includes a fixed base, first to third slide bases, and a copying roller, and the first and second slide bases are , is mounted on a fixed base so as to be movable back and forth, and the third slide base is
The copying roller is mounted on the second slide base so that it can move freely, and the copying roller is mounted on the fixed base.Roughly, the master cam and the workpiece are attached to the shaft removably and at the same phase angle, and the shaft is driven. A first drive mechanism for reciprocating the third slide base is mounted on the second slide base, and a second drive mechanism for reciprocating the third slide base is mounted on the second slide base to drive the grindstone. a third drive mechanism;
The first slide base moves back and forth according to the rotation of the master cam and the workpiece while maintaining at least one of the contact between the copying roller and the master cam or the contact between the grindstone and the workpiece. On the other hand, the second
The gist of the slide base is that the relative position between the grinding wheel and copying roller can be adjusted and set.

When using this configuration, first, the master cam is attached to the shaft on the first slide base, the master cam and the copying roller are brought into contact, and the position of the peripheral end surface of the master cam at the contact position of the two (hereinafter referred to as , the position of the reference line)
The position of the second slide base is adjusted so that the periphery of the grindstone and the periphery of the grindstone coincide with each other. Next, by attaching a workpiece to the shaft and operating the first drive mechanism, the first slide base can move back and forth as the workpiece rotates, and at this time, the grindstone and the workpiece come into contact with each other. Since this condition is maintained, the entire periphery of the workpiece can be ground.

As the grinding of the work progresses, the first slide base on which the work and the master cam are mounted also moves forward as a whole, but this forward movement is blocked by contact between the master cam and the copying roller. therefore,
Grinding of the workpiece is determined by the shape of the master cam, which rotates at the same phase angle as the workpiece, so it is possible to perform finishing grinding on the workpiece that accurately follows the shape of the master cam. It is.

Note that the third slide base on which the grindstone is mounted can be reciprocated by the second drive mechanism, so
The grinding wheel can make a traverse motion with respect to the workpiece, and therefore, uneven wear on the surface of the grinding wheel can be effectively prevented, and there is no risk of the workpiece's periphery becoming tilted or having circumferential lines. .

It works as described above.

Example Examples will be described below with reference to the drawings.

The copying grinding device mainly includes a fixed base 1, first to third slide bases 11, 21, 31, a shaft 13 for attaching a master cam M and a workpiece W, a copying roller 41, and a grinding wheel 32. It becomes a member (Fig. 1).

The fixed base 1 is a rectangular flat plate with a square hole 1a formed approximately in the center thereof, and above the square hole 1a.
A pulley 1b is provided (FIGS. 1 and 2). Further, on the upper surface of the fixed base 1, first and second slide bases 11 are arranged.
．． The rails 2a, 2a for the linear bearings 2.2 for guiding the bearings 21 are the mounting.

The first slide base 11 has slider units 2b, 2b, . . . for linear bearings 2.2 provided on its back surface.
・By combining the rails 2a, 2a on the upper surface of the fixed base 1, it is mounted on the upper surface of the fixed base 1 so as to be freely movable back and forth.

On the back surface of the first slide base 11, a wire 12a,
A weight 12 is suspended via a wire 12a.
a, 12a is wrapped around the above-mentioned pulley 1b, passes through the square hole 1a of the fixed base 1, and hangs down vertically. A stopper 3 is provided on one short side of the fixed base 1 to protrude upward, and can restrict the stroke of the first slide base in the backward direction (the direction opposite to the arrow 1 in FIG. 1). It looks like this.

Bearings 13a, 1 are provided on the upper surface of the first slide base 11.
A shaft 13 is mounted via 3a. A tapered part 13b and a male threaded part 13C are formed at one end of the shaft 13 (FIG. 3), and an adapter 13d having a positioning pin 13e erected thereon is fitted into the tapered part 13b, and another adapter 1
3f and a locking nut 13Cl, a workpiece W having a center hole Wa and a pin hole Wb can be detachably attached. Furthermore, the master cam M can be detachably attached to the other end of the shaft 13 in exactly the same manner (FIG. 2). However, the fitting angles of the adapters 13d and 13d with respect to the shaft 13 must be set so that the workpiece W and the master cam M have the same phase angle with each other. Hey, axis 1
A belt pulley 13h is attached to the center of the belt 3 (FIG. 1).

A first drive mechanism 14 consisting of a motor 14a, a timing belt 14'b, and a speed reducer 14c is mounted on the upper surface of the first slide base 11 (see FIGS. 1 and 2).
figure). However, a belt pulley 14d is fitted onto the output shaft of the reducer 14C, and a timing belt 1
4e is wrapped around it.

The second slide base 21 is a flat plate formed in a hook shape, and has a rail 2a on the back surface thereof.

Slider units 2b, 2 commonly combined with 2a
b... is attached and mounted so as to be movable back and forth with respect to the fixed base 1 (Fig. 1, Fig. 4).

A feed screw nut 22a is provided protruding from the back surface of the second slide base 21 (FIG. 2), while a manual handle 22a is provided on one end surface of the fixed base 1 via a bracket 22G.
By attaching the feed screw shaft 22b with 2d and screwing it into the feed screw nut 22a, the position of the second slide base 21 in the forward direction (two directions indicated by the arrow in FIG. 1) can be manually set as desired. It is now possible to do so. Also,
A lock member 23b is attached to one end surface of the second slide base 21 via a lock screw 23a.
(FIG. 4), the second slide base 21 can be fixed by tightening a lock plate 23G that stands up from the side end surface of the fixed base 1.

A second drive mechanism 24 including a motor 24a, a speed reducer 24b, and an eccentric joint 24G is mounted on the second slide base 21 (FIG. 1).

Here, the eccentric joint 24C is connected to the output shaft 24 of the reducer 24b.
This is a coupling in which a shaft 24e is inserted somewhat eccentrically from d (FIG. 4), and the shaft 24e is connected to the third slide base 31 via a link 24f.

The third slide base 31 is mounted on the second slide base 21 so as to be able to move freely ( Figures 2 and 4
figure). However, regardless of illustration, it is assumed that two sets of linear bearings 25, 25 are arranged in parallel in the moving direction of the third slide base 31 (in the three directions indicated by the arrows in FIG. 1).

The third slide base 31 is equipped with a third drive mechanism 33 including a motor 33a and a timing belt 33b, and a grindstone 32 driven by the third drive mechanism 33.

The grindstone 32 is removably attached to the tip of a shaft 32b supported via a bearing 32a with a nut 32C (Fig. 4), and a cover 32d is placed around it.
is provided. Here, it is assumed that the mounting position of the whetstone UJ32 is selected at a position facing the workpiece W on the first slide base 11. A belt pulley 32e around which a timing belt 33b is wound is attached to the rear end of the shaft 32b.

A dressing device 34 is attached to the upper surface of the bearing 32a. The dressing device 34 has an adjusting screw 34
A diamond tip 34a is attached to the tip of the bracket 34d, and a support member 34c that supports the adjusting screw 34b is attached to the bracket 34d.
It is guided by a long hole 34e on the top surface and can be moved in and out in the thickness direction of the grindstone 32 (four directions indicated by the arrows in FIG. 4).By screwing in the adjustment screw 34b, the diamond tip 34a
The grindstone 32 can be dressed by bringing it into contact with the grindstone 32.

The copying roller 41 is provided on the upper surface of the fixed base 1 so as to face the master cam M (FIGS. 1 and 2).
. The copying roller 41 is connected to the bracket 41b and @I+ 41
The bracket 41b is a rotatable tapered roller supported via the rough guide base 41G.
It is movable in the axial direction of the copying roller 41 via. That is, the copying roller 41 can be moved in a direction across the front surface of the master cam M (in the 5 directions indicated by the arrow in FIG. 1) by rotating the feed screw 41d via the knob 41f and moving the bracket 41b. ,Moreover,
Its position can be read by a scale plate 41e.

The diameter of the copying roller 41 is such that the large diameter side is somewhat larger than the maximum diameter of the grindstone 32 in use, and the small diameter side is slightly larger than the maximum diameter of the grindstone 32 during use.
It is preferable to select the diameter to be somewhat smaller than the minimum diameter of No. 2. Further, the shaft 41a that supports the copying roller 41, the shaft 32b that supports the grindstone 32, and the shaft 13 that supports the master cam M and the workpiece W all have the same height position and are parallel to each other. It shall be arranged so that In particular, it is assumed that the axes of the first two are on the same straight line.

The operation of the copy grinding device having such a configuration is as follows.

First, at one end of the shaft 13 on the first slide base 11,
Install Master Cam M. Here, Master Cam M is
By forming a slope 1vla on one side of the entire circumference that matches the finished shape of the workpiece W and having an angle that matches the taper of the copying roller 41, the contact with the copying roller 41 becomes a surface contact. It is best to keep it as such (Figure 5).

Also, at this time, the second slide base 21 is sufficiently moved back by operating the manual handle 22d, and the first slide base 11 is moved backward. shall be kept.

Next, if the first slide base 11 is made free,
The first slide base 11 is moved forward by the hanging of the weight 12, and the peripheral edge of the master cam M is moved forward by the copying roller 41.
It stops at the position where it touches the circumferential side. So, now, the fifth
In the figure, the position of the peripheral end surface of the master cam M at the contact position between the master cam M and the copying roller 41 is represented by a reference line A, and the position of the peripheral end surface of the grinding wheel 32 is
The second slide base 21 is moved forward and the second slide base 21 is locked at this position. Here, the manual handle 22d is used to move the second slide base 21 forward.
According to the lock screw 23a, the lock may be
As mentioned above, the following applies. In addition, whetstone 3
2 is mounted on the second slide base 21 via the third slide base 31, by moving the second slide base 21 forward, the relative position of the grinding wheel 32 and the reference line A, i.e. The relative positions of the grindstone 32 and copying roller 41 can be adjusted and set as desired.

Subsequently, the workpiece W is attached to the other end of the shaft 13 so as to face the grindstone 32. When mounting the workpiece W, the positioning pin 13e of the adapter 13d is used so that the workpiece W has the same phase angle as the master cam M. Here, since the workpiece W is formed to be larger than the master cam M by the finishing allowance, the peripheral edge of the workpiece W will protrude in the direction of the grindstone 32 beyond the reference line A. At this time, the horn of the first slide base 11 in the forward direction by the weight 12 is
While the master cam M and the copying roller 41 are supported by the grindstone 32 via the grindstone 32, the master cam M and the copying roller 41 are separated from each other with a gap corresponding to the finishing allowance of the workpiece W. However, the workpiece W is held by the weight 12 against the grindstone 32.
It is in a state where it is being pressed down with a force determined by the limbs of the body.

Next, each motor 1 of the first and third drive mechanisms 14.33
4a and 33a and start operating the master cam M, the workpiece W, and the grindstone 32, the grinding of the workpiece W by the grindstone 32 can be started. In addition, motor 1
If it is desired to temporarily separate the grinding wheel 32 and the workpiece W when starting the grinding wheels 4a and 33a, the knob 41f can be used. That is, by operating the knob 41f, the copying roller 41 is moved forward, and the copying roller 41
If the master cam M is pushed away by the larger diameter side of the first slide base 11, the first slide base 11 will be moved back by that amount, so that the grindstone 32 and the workpiece W can be separated.

Therefore, in this state, start the motors 14a and 33a,
After the start-up is completed, the copying roller 41 may be returned to its original position. Also, the first slide base 11 may be pulled rearward from time to time.

In this way, when grinding of the workpiece W is started, the master cam M and the workpiece W rotate at a relatively slow rotation speed determined by the reduction ratio of the reduction gear 114c.
Since the first slide base 11 is always urged in the forward direction by the weight 12, the first slide base 11 moves back and forth with the rotation of the work W, and moreover, the first slide base 11 moves forward and backward as the work W rotates. The pressing force acting between the grinding wheel 32 and the grinding wheel 32 can be kept constant, so that the entire periphery of the workpiece W can be subjected to a similar grinding process.

In this way, as the grinding of the workpiece W progresses and the finishing allowance is removed, the master cam M moves forward accordingly, so that the gap between it and the copying roller 41 gradually becomes smaller. Go.

Therefore, if the peripheral edge of the master cam M starts to come into contact with the peripheral side of the copying roller 41, the master cam M is prevented from moving forward any further, so that no further grinding of the workpiece W is performed. This holds true for the entire periphery of the master cam M even if the master cam M has an arbitrary shape, so that the workpiece W can ultimately be ground to have the same shape as the Australian master cam M.

In the entire process of the above grinding process, the second drive mechanism 24
When the motor 24a is operated, the third slide base 31 on which the grindstone 32 is mounted can be reciprocated via the eccentric joint 24G and the link 24f. Therefore,
Now, as the third slide base 31 reciprocates, the periphery of the grinding wheel 320 is uniformly ground in the thickness direction of the workpiece W.
If the grindstone 32 is set so as to be in contact with the workpiece W, the grindstone 32 can properly traverse the workpiece W.

Therefore, it is possible to prevent the grinding wheel 32 from wearing out unevenly and to prevent the formation of steps in the circumferential direction, effectively eliminating the possibility that the circumferential edge of the workpiece W will be tilted or that streaks will be formed in the circumferential direction. It is possible to do so.

In this way, the workpiece W that has completed the grinding operation is
3, then attach a new workpiece W7Fr, and repeat the same procedure.

By processing a large number of workpieces W, the radius of the grindstone 32 becomes
When the initial value r decreases to r1 By changing <R, the position of the reference line A can be changed to the position of the reference line A1 to cope with the problem. However, here, R is the radius of the copying roller 41 corresponding to the original reference line A, and the reference line A1 is assumed to be located at the peripheral edge position of the grindstone 32 with the radius r1.

When the radius of the grinding wheel 32 reaches a value rm that coincides with the position of the reference line Am corresponding to the minimum radius Rm of the copying roller 41, the second slide base 21 is moved forward again and the grinding wheel 32 is moved forward again.
By moving forward, the position of the reference line A can be pulled back to within the taper range of the copying roller 41. However, the root diameters of the copying roller 41 and the grindstone 32 are such that the machining accuracy of the workpiece W can be improved by making the contact states as equal as possible with respect to the workpiece W and the master cam M, which have the same shape. It is preferable not to use the grindstone 32 having a radius extremely smaller than the minimum radius Rm of the copying roller 41.

In the above description, instead of the weight 12, any other means such as a fluid pressure cylinder or a spring may be used as the means for constantly urging the first slide base 11 in the forward direction. It shall be possible.

Further, the copying roller 41 may be a simple cylindrical roller instead of a tapered roller.

However, at this time, the position of the reference line A cannot be moved even if the copying roller 41 is moved back and forth, so the grinding wheel 3
It is not possible to simply deal with the reduction in diameter of 2. Roughly speaking, the copying roller 41 may be a step-like tapered roller in which a large number of disks having different diameters are stacked. The contact with the master cam M can be a complete surface contact.

According to the detailed description of the invention, a fixed base;
Comprising first to third slide bases and a copying roller, the first and second slide bases are movable back and forth on a fixed base, and the third slide base is movable transversely on the second slide base. The copying roller is mounted on a fixed base, and the shaft on which the master cam and workpiece are attached, and the first drive Ia @ that drives the shaft are mounted on the first
A second drive mechanism for reciprocating the third slide base is placed on the second slide base, and a third drive mechanism for driving the grindstone is placed on the third slide base. Roughly speaking, the first slide base moves back and forth while maintaining contact between the copying roller and the master cam or the workpiece and the grinding wheel, while the second slide base moves between the grinding wheel and the copying roller. By making the relative position adjustable, the grindstone can apply uniform grinding to the entire circumference of the workpiece up to the maximum grinding amount regulated by the shape of the master cam. Just by setting it, you can easily perform automatic grinding of the workpiece, and
Since its configuration is extremely simple, it has an excellent effect in that it can be well adapted to introduction into small and medium-sized enterprises.

[Brief explanation of the drawing]

1 to 5 show examples, FIG. 1 is an explanatory overall plan view, FIG. 2 is an explanatory cross-sectional view taken along the line X-X in FIG. 1, and FIG. 3 is an enlarged sectional view of main parts. FIG. 4 is an explanatory cross-sectional view taken along the Y--Y line in FIG. 1, and FIG. 5 is an explanatory diagram of the operation. M... Master cam W... Work... Fixed base 11... First slide base 13... Shaft 14... First drive mechanism 21...
Second slide base 24...Second drive mechanism 31...Third slide base 32...Whetstone 33...Third drive mechanism 41...
・Copying roller

Claims (1)

[Claims] 1) A fixed base, first and second slide bases mounted on the fixed base so as to be movable back and forth, and a third slide mounted on the second slide base so as to be movable laterally. The first slide base includes a shaft to which the master cam and the workpiece are attached removably and at the same phase angle, and a first shaft that drives the shaft. The second slide base is equipped with a second drive mechanism that reciprocates the third slide base, and the third slide base includes a grindstone and a drive mechanism for reciprocating the third slide base. The first slide base is equipped with a third drive mechanism that drives the master cam and the workpiece while maintaining at least one of contact between the copying roller and the master cam and contact between the grindstone and the workpiece. The copying grinding device is characterized in that the second slide base moves back and forth according to the rotation of the copying roller, and the relative position between the grindstone and the copying roller can be adjusted. 2) The copying grinding device according to claim 1, wherein the copying roller is a tapered roller whose contact position with the peripheral edge of the master cam can be adjusted and set. 3) The copying grinding device according to claim 1 or 2, wherein the first slide base is always urged in the forward direction.