JPH0719685Y2 - Tip saw grinding machine for tip saw - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for grinding and finishing a tip seat of a tip saw formed by brazing the tips of the teeth of a circular saw tooth.

[0002]

2. Description of the Related Art A conventional grinding device of this type is a grinding wheel head provided so that a disk-shaped grinding wheel that is rotated by a rotary drive unit moves linearly forward and backward in the radial direction.
The base metal supporting device is provided for rotating the base metal of the tip saw held at a predetermined position by the indexing device by the rotation angle corresponding to one pitch according to the number of teeth. That is, when grinding one tip seat, as shown in FIG. 4, the base metal 1 is positioned in a stationary state and its teeth 2
In contrast, the diamond grindstone 3 has arrows 4, 5 along a straight line.
As shown by (3), the chip seat 7 is formed by grinding the portion 6 shown by hatching by advancing and retracting. The base metal 1 is formed by punching a metal plate with a press machine.
It is necessary to finish grinding the surface on which the chips are brazed.

[0003]

In the conventional tip seat grinding machine, for example, the target value of the corner portion of the tip seat 7 is set to 0.3.
In the case of R or less, the corner 3a of the grindstone 3 is about 0.2R at first, but the corner 3a is 0.3R due to use.
Therefore, it is necessary to correct the grindstone 3. There is a problem in that the wear of the corner portion 3a is extremely fast. The wear state is shown in FIG.
As exaggeratedly shown, the process proceeds in the order of A, B, and C. As can be understood from FIG. 4, the reason why the R of the corner portion increases extremely rapidly is that the grinding amount by the front surface in the traveling direction of the corner portion 3a when the grindstone 3 advances along the arrow 4 and grinds. Because it is the most. Such extreme wear poses a problem in that the number of corrections with respect to the grinding quantity increases even when the grindstone is modified. An object of the present invention is to avoid extremely early wear of the corners of the grindstone and reduce the number of corrections to the grinding amount.

[0004]

Means for Solving the Problems The means of the present invention supports a grindstone which is rotated by a rotary drive unit, and a grindstone base provided on the main body so as to be movable back and forth along a predetermined first straight line together with the grindstone. And a chuck for holding the base metal of the tip saw so that its rotating side surface is at right angles to the rotating side surface of the grindstone, and has an indexing device for sequentially rotating the chuck by one pitch corresponding angle according to the number of saw teeth. The base metal supporter supported by the main body so as to be capable of reciprocating along a second straight line perpendicular to the first straight line, and the grindstone base according to the rotation of a cam which is supported by the main body and is rotationally driven. A cam device provided so as to move forward and backward, and an interlocking mechanism for driving the base metal support base in the direction along the second straight line based on the advance of the grindstone support base from near the end of the advance of the grindstone support base to the end. Equipment It becomes, wherein the base metal support base is configured to perform grinding while moving in a direction along the second straight line.

[0005]

According to the above means, the interlocking device moves the base metal support table in a direction perpendicular to the traveling direction of the grindstone near the end of the forward movement of the grindstone base on which the grindstone grinds. On the other hand, the grindstone moves forward diagonally, for example, the standard disk-shaped grindstone grinds not only the front surface, that is, the peripheral surface but also the side surface. At the same time, the grinding surface of the grindstone is widened so that local wear is avoided and the R of the corner of the grindstone does not increase extremely rapidly.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. In this grinding apparatus, a main body 10 having a rectangular parallelepiped shape is provided with a grindstone base 11, a base metal support 12, a cam device 13, an interlocking device 14, and the like. The grindstone base 11 has two horizontal rods 21 and 21 axially slidably supported by a bearing-shaped guide portion 20 provided on the upper surface of the main body 10, and straddles both rods 21 and 21. Then, fix the stand body 22,
The base body 22 is provided with an arm 24 supporting a rotary grindstone 23 at its tip, a motor 25 for rotationally driving the grindstone 23, a belt and a pulley 26, and the like. When the grindstone base 11 moves forward and backward along the guide portion 20, the grindstone 23 also moves forward and backward. The grindstone 23 is a general disc-shaped diamond grindstone, and its axis is provided at right angles to the advancing / retreating direction of the grindstone base 11 and horizontally.

The base metal support base 12 is a frame-shaped member which is arranged on the main body 10 in the forward and backward direction of the grindstone 23 so that the rotating side surface of the base 27 of the tip saw is perpendicular to the rotating side surface of the grindstone 23. An indexing device 29 for sequentially rotating the chuck 28 at a pitch equivalent angle according to the number of saw teeth based on a predetermined electric signal.
have. The base metal support base 12 is supported by the main body 10 so as to be movable in a small dimension at right angles to the advancing / retreating direction of the grindstone 23 and in a horizontal direction. The support structure includes one horizontal rod 30 fixed to the base support 12 along the moving direction,
It is composed of a bearing-shaped guide portion 31 provided on the main body 10 that supports it so as to be movable in the axial direction, and a roller assembly 32 provided between the main body 10 and the base metal support 12. As a result, the base metal support 12 can be moved horizontally in the direction of the rod 30.

The cam device 13 includes a cam shaft 34 vertically supported by a bearing 33 in the central portion of the main body 10, and a cam shaft 34.
Fixed to the cam 35, the rod 21, the roller 36 circumscribing the cam provided at the tip of the portion 21a extending from the side, and the spring 3 pressing the roller 36 to the outer circumference of the cam.
7, spring bearing 38 fixed on the main body 10, cam shaft 34
And a belt 40 and a pulley 40 for rotating the motor. As shown in FIG. 2, the shape of the cam 35 is such that almost half of the entire outer circumference is largely projected and the other half is gradually reduced in diameter by 0.4 mm in the radial direction. With this configuration, when the motor 39 rotates at a predetermined speed, the grinding wheel head 11 moves back and forth according to the shape of the cam. The state shown in FIGS. 1 and 2 is a state in which the grindstone 11 is retracted, and when the cam shaft 34 rotates in the direction of the arrow 41, the small diameter portion of the cam 35 comes into contact with the roller 36. The grindstone base 11 moves forward. And the small diameter part is the roller 3
The wheel head 11 is further rotated by 0.4 mm and then retracted to its original position.

The interlocking device 14 supports a roller 42, which is the same as the roller 36, slightly above the same axis as the roller 36, and has a bent portion of an L-shaped lever 43 with one arm contacting one end with the roller 42 and having the same arm length. A vertical shaft 44 is rotatably supported on the upper surface of the main body 10, and the other end of the L-shaped lever 43 is made to face the flange portion 45 provided on the rod 30.
2 is a configuration in which return springs 46, 46 are provided so as to be able to return later when the rod 2 is held at a predetermined position with respect to the moving direction along the rod 30 and is moved. The return spring 46 is provided in a compressed state between a spring bearing 47 provided on the main body 10 and a spring bearing 48 provided on the base metal support 12, and has a head portion for adjusting the distance between the spring bearings 47 and 48 to a predetermined size. The bolt-shaped shaft member 49 is provided so as to slidably penetrate the spring receiver 48 and be screwed into the spring receiver 47, whereby the initial position of the base metal support 12 is adjusted. At this initial position, the roller 42 drives the L-shaped lever 43 by advancing and retracting the grindstone 11, so the timing at which the other end of the L-shaped lever 43 rotated by the drive pushes the flange 45 and starts moving. Roller 36 is cam 3
It is made to match when it reaches the small diameter portion of 5. Therefore, while the grindstone base 11 moves forward 0.4 mm by the small diameter portion of the cam, the base metal support 12 moves 0.4 mm upward from the initial position in the horizontal direction at a right angle thereto.

In FIG. 1, a limit switch 50 is driven by a projection 51 provided on the cam shaft, and the indexing device 29 obtains a timing signal for driving one pitch of saw teeth. The timing is 1
It is the time when 1 has retreated.

The tip saw grinding device of the tip saw thus constructed operates as follows. When the base 27 of the tip saw is held by the chuck 28 and started, the grindstone 2
3 rotates, and the cam shaft 34 starts rotating. The large diameter portion of the cam 35 is first in contact with the roller 36. In this state, the grindstone 23 and the pedestal 27 are in the positional relationship shown by the solid line in FIG. While the roller 36 comes into contact with the small diameter portion of the cam 35, the grindstone 23 moves forward, and when the roller 36 comes into contact with the small diameter portion, the grindstone 2
3 is a position indicated by an imaginary line 23a. Next, in the process of rotating along the small diameter portion, the grindstone base 11 advances by 0.4 mm, and at the same time, the interlocking device 14 drives the base metal support 12 to move in the axial direction of the grindstone 23. Since it moves 0.4 mm, the grindstone 23
Would be the same as if it proceeded diagonally with respect to the base metal 27.
At the stage when the contact with the small diameter portion of the roller 36 ends, the grindstone 23 becomes the position shown by the imaginary line 23b. This grindstone 23 is at position 2
While diagonally advancing from 3a to position 23b, the tip seat 52, which has been pressed on the teeth 51 of the base metal 27, is ground to the grinding allowance shown by hatching in the drawing. The grinding allowance is in this case about 0.2 mm. While the roller 36 comes into contact with the large diameter portion of the cam 35 from the small diameter portion,
Since the base metal 12 is retracted and the base metal support 12 is also returned in the initial stage of the rearward motion, the grindstone 23 is first obliquely retracted with respect to the base metal 27 and then retracted. The backward route is the same route as when traveling.

In this tip saw grinding apparatus for a tip saw, since the grindstone 23 substantially grinds while diagonally advancing with respect to the base metal 27 of the tip saw, an L-shaped tip seat is formed on the outer peripheral surface and the side surface of the grindstone 23. Since the entire surface is ground at the same time, the grindstone wears almost uniformly over a wide range corresponding to the tip seat, and there is no sharp wear of the corners of the grindstone. Therefore, the number of grindstone corrections is significantly reduced as compared with the prior art. This improves processing efficiency.

[0013]

[Effect of the Invention] According to the present invention, when grinding the tip seat of the tip saw, there is no sudden wear of the corners of the grindstone, and the number of grindstone corrections is greatly reduced compared to the conventional one, so the effect of improving machining efficiency is obtained. To be

[Brief description of drawings]

FIG. 1 is a schematic front view showing the configuration of an embodiment of the present invention.

FIG. 2 is a schematic partially omitted plan view of the embodiment.

FIG. 3 is a partially enlarged plan view for explaining a grinding state by the apparatus of the same embodiment.

FIG. 4 is an enlarged plan view for explaining a grinding state of a conventional tip saw grinding device for a tip saw.

[Explanation of symbols]

 10 main body 11 grindstone base 12 base metal support base 13 cam device 14 interlocking device 23 grindstone 27 base metal 28 chuck 29 indexing device 35 cam

Claims (1)

[Scope of utility model registration request] 1. A grindstone base supported on a grindstone which is rotated by a rotary drive unit and is movable together with the grindstone along a predetermined first straight line, and a base of a tip saw. Is provided with a chuck for holding it at a right angle to the rotating side surface of the grindstone, and has an indexing device for sequentially rotating the chuck by an angle corresponding to one pitch in accordance with the number of saw teeth. The main body has a right angle to the first straight line. A metal base that is supported so as to be able to reciprocate along a second straight line,
A cam device provided so that the grindstone base moves back and forth in accordance with the rotation of a cam which is supported by the main body and is driven to rotate, and a grindstone support base advances from near the end of the advance of the grindstone support to the end thereof. And an interlocking device that drives the base metal support base in the direction along the second straight line, and is configured to perform grinding while the base metal support base moves in the direction along the second straight line. The feature is the tip saw grinding device for the tip saw.