JPH04300151A - Holder of material to be ground - Google Patents

Abstract

PURPOSE:To easily and precisely perform a grinding process against the large diameter projecting portion of a linear rod material. CONSTITUTION:In a polishing device which holds a linear rod material 1, when a grinding stone 11 provided in the device is rotated and the large diameter projecting portion 2 of the linear rod material 1, is polished, the device is characterized in comprising a work rest 24 provided with a loading portion for loading the linear rod material 1, a stopper portion for pressing the linear rod material 1 loaded on the above loading portion to stop a moving thereof toward the grinding stone 11, and a recessed portion for releasing the large diameter projecting portion 2 of the linear rod material 1; and a moving means for moving the work rest 24 along the direction, being at right angles to an axis of the grinding stone 11.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for holding a wire rod when polishing the large diameter projection of the wire rod by rotating a polishing member provided in a polishing device.

0002

BACKGROUND OF THE INVENTION For example, tungsten wire rods are manufactured by press-forming material powder, sintering the material, rolling the resulting sintered body, and then wire-drawing the resulting sintered body. However, since the sintered body before processing is obtained by press-molding material powder, there are restrictions on the length of the wire rod due to equipment problems. Therefore, it is possible to manufacture tungsten wire rods by, for example, welding together multiple wire rod materials after rolling and rolling to obtain a long material, and then further performing rolling and wire drawing. It is being done.

[0003] In order to join a plurality of wire rod materials for the purpose of obtaining such long wire rod materials, butt resistance welding is employed as an appropriate welding method. When butt resistance welding is performed, a phenomenon occurs in which the butt portions of the materials bulge. When wire rod materials are joined by butt resistance welding,
A flange-like large diameter protrusion having a diameter larger than the diameter of the wire rod material is formed at the abutting portion of each wire rod material. FIG. 8 shows a wire rod material obtained by butt welding wire rod materials. 1 is a wire rod material, and 2 is a large diameter protrusion formed at the abutting portion of the wire rod material. However, this large diameter protrusion 2
This becomes an obstacle when passing the wire through the wire drawing equipment during wire drawing. Therefore, before performing the wire drawing process, the large diameter projection 2 of the wire bar material 1 is
is removed to make the diameter of the entire wire rod 1 uniform.

[0004] Conventionally, in order to remove the large-diameter protrusions of this wire rod material, a method of polishing using a single-head desk grinder as a polishing device has been adopted. FIG. 9 shows a method using this desk grinder. Reference numeral 11 denotes a disk-shaped grindstone which is rotatably provided in a tabletop grinder around a horizontal axis, and is rotated by an electric motor (not shown). 12 is a workrest made of plate material, and a grindstone 11
It is fixedly provided at a position close to and facing the outer circumferential surface of.

During polishing, an operator holds the wire rod 1 in his hands and places it parallel to the axis of the grindstone 11 with the large diameter protrusion 2 placed on the upper surface of the work rest 12. Then, the large-diameter protrusion 12 is brought into contact with the rotating grindstone 11, and the wire bar 1 is
Polish while turning. As a result, the large-diameter protrusion 12 is sequentially polished starting from the outer circumference, and its diameter is reduced. The operator sequentially feeds the wire rod 1 toward the outer periphery of the grindstone 11 and constantly brings the large-diameter protrusion 2 into contact with the outer periphery of the grindstone 11 to perform polishing. The large diameter protrusion 2 is finally polished until it has the same diameter as the wire rod 1.

[0006]

[Problems to be Solved by the Invention] However, when polishing a large diameter protrusion of a wire rod using this method, there are the following problems.

As the large-diameter protrusion 2 of the wire bar 1 is polished and the diameter of the large-diameter protrusion 2 is reduced, the center of rotation of the wire bar 1 moves downward toward the workrest 12. For this reason,
It is difficult to hold and rotate the wire rod 1 during polishing.

[0008] If the large-diameter protrusion 2 is simply placed on the work rest 12, the wire rod 1 cannot be held stably, and the amount of feed of the large-diameter protrusion 2 relative to the grindstone 11 cannot be regulated. For this reason, it is difficult to uniformly polish the outer periphery of the large diameter protrusion 12 while maintaining its circular shape, and not only is it difficult to rotate the wire bar 1, but also the wire bar It is difficult to finish the butt part 1 with the required dimensional accuracy.

When the diameter of the large-diameter protrusion 12 decreases with the polishing process and the outer circumference of the grindstone 11 wears, the gap between the outer circumference of the grindstone 11 and the workpiece 12 increases. For this reason, a situation occurs in which the wire rod 1 being polished is drawn into the gap between the outer circumference of the grindstone 11 and the workrest 12. The wire rod 1 drawn into the gap between the outer periphery of the grindstone 11 and the work rest 12 is ground by the grindstone 12 and becomes a defective product without being able to obtain a circular cross section.

The present invention has been made based on the above-mentioned circumstances, and an object of the present invention is to provide a polishing material holding device that can easily and accurately polish a large-diameter protrusion of a wire rod material.

[0011]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a device for holding a material to be polished in polishing processing, in which the large-diameter protrusion of a wire rod having a large-diameter protrusion is provided in the polishing device. In the apparatus for holding the wire rod material when rotating and polishing the abrasive member, the wire rod material is held by a placing part on which the wire rod material is placed, and the wire rod material placed on this placing part is held down while the wire rod material is being polished. a workrest having a stopper portion for preventing movement toward the member; and a recess portion for releasing the large-diameter protrusion of the wire rod placed on the mounting portion; The apparatus is characterized by comprising a moving means for moving the apparatus along a direction perpendicular to the axis thereof.

0012

[Function] When polishing the large-diameter protrusion of a wire rod, the wire rod can be stably held by placing it on the work rest and hitting the stopper, allowing the wire rod to be polished without over-polishing. In addition, it is possible to prevent the polishing member from being drawn into the gap between the outer peripheral portion and the work rest. By letting the large-diameter protrusion of the wire bar into the relief part of the work rest, the wire bar can be stably held in a fixed position regardless of the diameter of the large-diameter protrusion being gradually reduced during the polishing process. . By moving the workrest toward the abrasive member using the moving means, the wire rod held on the workrest can be fed toward the abrasive member at a constant feed rate.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 7. In addition, in the drawing, wire bar 1
, the large-diameter protrusion 2, and the grindstone 11 are indicated by referring to the reference numerals in the above description. FIGS. 1 and 2 show the structure of a polishing material holding device. This device is provided opposite to the outer periphery of the grindstone 11 of the polishing device.

In the figure, reference numeral 21 denotes a rectangular base, which is disposed horizontally along a direction perpendicular to the axial direction of the grinding wheel 11 at a position facing the outer periphery of the grinding wheel 11 of the polishing device. is attached to. base 21
A notch 21a is formed in the front part of the grinding wheel 11 to allow the outer peripheral part of the grindstone 11 to escape. A pair of guide rails 22 are provided on both sides of the base 21 along a direction perpendicular to the axial direction of the grindstone 11.
22 are arranged. Further, a slide block 23 is disposed on the upper surface of the base 21 at a portion sandwiched between a pair of guide rails 22, 22, and this slide block 23 is guided by the guide rails 22, 22 to align the axis of the grinding wheel 11. It is arranged to move along a direction perpendicular to the direction, that is, a direction in which it approaches and leaves the grindstone 11.

A work rest 24 for holding the wire rod 1 is attached to the front of the upper surface of the slide block 23. As shown in FIGS. 3 and 4, this workrest 24 has a horizontal upper surface and a mounting portion 2 on which the wire rod 1 is placed.
4a, and a large-diameter protrusion 2 of the wire rod 1 is located at the center facing the outer periphery of the grindstone 11 in the front part of the mounting part 24a.
A recessed portion 24b is formed as a relief portion for letting out. The recess 24b has a depth greater than the maximum diameter of the large-diameter protrusion 2 of the wire rod 1, and the portion facing the grindstone 11 is open. Furthermore, the workrest 24 is
Stopper parts 24c, 24c are formed on the front edge of the recess 24b, ie, on both sides of the grindstone 11, and these stopper parts 24c, 24c are vertically erected to press the wire bar 1 and align the axis of the grindstone 11. The wire rod material 1 is held in a direction parallel to the grinding wheel 11 to prevent movement of the wire rod material 1 with respect to the grindstone 11.

A nut holder 25 is provided at the rear of the base 21, and the nut 2 provided on the nut holder 25 is
6 has a feed screw 27 inserted therethrough. This feed screw 27
is arranged along a direction perpendicular to the axial direction of the grindstone 11, and its rear part is connected to a rotating device (not shown) and rotated. This screw rotating device uses an electric motor. The front part of the feed screw 27 is a slide block 23
It is inserted through a hole 23a formed at the rear of the slide block 23 and is rotatably connected to the slide block 23 in the configuration described below. That is, the hole 23b is formed in the slide block 23,
A circular piece 28 is placed in this hole 23a. Feed screw 27
is inserted into a circular piece 28 disposed in the hole 23b from the hole 23a and is locked by a pin 29. The slide block 23 coupled to the feed screw 27 in this manner is moved by the rotation of the feed screw 27.

Further, light source bodies 30A, 30B are provided on one of the pair of stopper portions 24c, 24c of the work rest 24 with a gap in the moving direction of the work rest 24, and the light source bodies 30A, 30B are provided on the other side. Photoreceptors 31A and 31B made of photoelectric conversion elements are provided opposite to 30B. These light sources 30A, 30B and photoreceptors 31A, 31B are used to detect the positional relationship between the workrest 24 and the grindstone 11. That is, the light emitted from the light sources 30A, 30B reaches the photoreceptors 31A, 31B. Photoreceptor 31A
, 31B receives light and converts it into an electrical signal. Photoreceptor 3
1A and 31B are light source bodies 30A and 30B and photoreceptor 31A
, 31B, the grindstone 11 crosses the line connecting the light source body 30A,
When the light from 30B is blocked, a signal indicating the presence of the grindstone 11 is output to a detection circuit (not shown). This detection circuit outputs a control signal to a display device that displays the positional relationship between the work rest 24 and the grindstone 11 in response to detection signals from the photoreceptors 31A and 31B, and also rotates the grindstone rotation device and the feed screw. Outputs control signals to the device.

The operator intermittently rotates the wire rod 1 held on the work rest 24 in accordance with the rotation of the grindstone 11. As a result, the grindstone 11 grinds the large-diameter protrusion 2 . Here, the wire rod 1 can be fixed to the workrest 24 or rotated not only by an operator but also mechanically. As the grinding work progresses and the outer circumference of the grinding wheel 11 wears out and gradually decreases in size, the work rest 2
The relationship with 4 becomes the positional relationship shown in FIG. 5 via FIG. 6. The above operations are repeated to perform polishing. A case will be described in which the large-diameter protrusion 2 of the wire rod 1 is polished using the polished material holding device configured as described above. The polishing operation will be explained with reference to the positional relationship between the workpiece 24 and the grindstone 11 shown in FIGS. 5 to 7.

First, as shown in FIGS. 1 and 2, an operator holds the wire rod 1 in his hands and sets the wire rod 1 in a direction parallel to the axis of the grindstone 11. The wire rod 1 is placed on the mounting portion 2 of the workrest 24.
4a and abut against the stopper portions 24c, 24c, and the large diameter protrusion 2 is placed in the recess 24b. For this reason, the wire rod 11 is oriented with respect to the grinding wheel 1 and
The large-diameter protrusion 2 is prevented from moving toward the grindstone 11, and the large-diameter protrusion 2 escapes from the mounting portion 24a and is opposed to the outer circumferential surface of the grindstone 11. Before the start of polishing, the front end of the work rest 24 attached to the slide block 23 is in the position shown in FIG. That is, the pair of stopper portions 24c, 2 of the workrest 24
4c, the outer peripheral surface of the grindstone 11 is located on the front side with respect to the line connecting the light source body 30A and the light receiving body 31A, which are located on the front side in the moving direction. At this time, the pair of stopper parts 24c
, 24c, the light emitted from each light source body 30A, 30B reaches each light receiving body 31A, 31B. Photoreceptor 31A
, 31B provide signals to the display device and screw rotation device. The display device indicates that polishing cannot be performed. The screw rotating device rotates the feed screw 27 to move the slide block 23 forward along the guide rail 22 on the base 21 toward the grindstone 11. As a result, the work rest 24 provided on the slide block 23 moves forward,
The wire rod 1 held on the workrest 24 also moves forward toward the grindstone 11.

As shown in FIG. 6, as the work rest 24 moves forward, the light source body 30A and the light receptor 31 located on the front side in the moving direction at the pair of stopper portions 24c, 24c move forward.
A line connecting A is located on the front side beyond the outer peripheral surface of the grindstone 11. Then, the light from the light source body 30A is blocked by the grindstone 11 and does not reach the light receptor 31A, and the light receptor 31A provides a signal to the display device. The display device displays the state in which polishing is possible.

As shown in FIG. 7, as the work rest 24 moves forward due to further rotation of the feed screw 27, the light source body 30B and the photoreceptor located on the rear side in the direction of movement at the pair of stopper portions 24c, 24c are moved forward. A line connecting 31B is located on the front side beyond the outer peripheral surface of the grindstone 11. Then, the light from the light source body 30B is blocked by the grindstone 11 and does not reach the light receptor 31B. Photoreceptor 31B provides signals to the display and screw rotation device. The display device displays the state in which the outer circumferential surface of the grindstone 11 protrudes to the upper limit with respect to the contact surfaces of the wire bar 1 of the stopper portions 24c, 24c of the work rest 24, and the screw rotation device stops the rotation of the feed screw 27. . This stops the movement of the slide block 23. Here, the light source body 30
The relationship between A, 30B and the photoreceptors 31A, 31B will be specifically explained.

First, the light source body 30B and the light receiving body 31B are fixed to the stopper portion 24c. It must be provided at a position where the amount of polishing of the outer periphery of the large diameter protrusion 2 of the wire rod 1 is to be maximized. In other words, when the grindstone 11 grinds the outer circumference of the wire bar 1, the amount of polishing is maximized, and the position is such that the large diameter protrusion 2 is not ground more than the diameter of the wire bar 1. The outermost circumference of the grindstone 11 is provided at a position where it can be detected.

Further, the light source 30A and the photoreceptor 31A detect a decrease in the diameter of the large-diameter protrusion 2 of the wire rod 1 due to grinding by the grindstone 11, and when the photoreceptor 31A receives the light, the work rest 24 is moved forward. And these light source bodies 30A, 30
The distance between B and the photoreceptors 31A and 31B is set within the permissible range of the polished dimensions of the wire rod 1.

In this embodiment, when holding the wire rod 1 on the workrest 24 and polishing the large diameter protrusion 2,
The large diameter protrusion 2 is released into the recess 24b of the work rest 24,
The wire rod 1 can be stably held by placing it on the mounting parts 24a located on both sides of the recess 24b, and the large diameter protrusion 2 can be held by placing it on the stopper parts 24c, 24c located on both sides of the recess 24b. Grinding can be performed without cutting too much from the diameter of the wire rod 1. Therefore, the wire rod 1 can be easily and stably held at a fixed position regardless of the diameter of the large-diameter protrusion 2 being gradually reduced by the polishing process. moreover,
By moving the workpiece 24 toward the grindstone 11 using a moving means including a slide block 23 and a feed screw 27, the wire rod 1 held on the workpiece 24 is removed.
can be sent toward the grindstone 11 at a constant feed amount. Therefore, the operator can easily and accurately remove the large diameter protrusion 2.
can be removed by polishing. Also, wire rod 1
The grinding wheel 11 does not come into contact with the stopper portions 24c, 24c of the work rest 24 and be drawn into the gap between the outer peripheral portion of the grinding wheel 11 and the work rest 24, and the generation of defective products due to this situation can be prevented. Note that the configuration of the polishing material holding device of the present invention is not limited to the embodiment described above.

The material-to-be-polished holding device of the present invention is not limited to wire rods having large-diameter protrusions generated during the production of tungsten wire rods, but can be applied to wire rods having various large-diameter protrusions. Can be used for polishing large diameter protrusions.

[0026]

As described above, according to the present invention, it is possible to provide a polished material holding device that can easily and accurately polish a large diameter protrusion of a wire rod material.

[Brief explanation of the drawing]

FIG. 1 is a front view of a polishing material holding device in one embodiment of the present invention.

FIG. 2 is a plan view of a polishing material holding device.

FIG. 3 is a front view showing the workrest in the same embodiment.

FIG. 4 is a diagram showing a state in which a wire rod is held on a workrest.

FIG. 5 is a diagram showing the positional relationship between the workpiece and the grindstone during polishing in the same embodiment.

FIG. 6 is a diagram showing the positional relationship between the work rest and the grindstone during polishing in the same embodiment.

FIG. 7 is a diagram showing the positional relationship between the work rest and the grindstone during polishing in the same embodiment.

FIG. 8 is a diagram showing an example of a wire rod.

FIG. 9 is a diagram showing a conventional polishing material holding device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1...Wire bar, 2...Large diameter protrusion, 11...Whetstone, 21...Bay
22...Guide rail, 23...Slide block, 2
4... Workrest, 24a... Placement part, 24b... Recessed part, 2
4c, 24c...Stopper part, 27...Feed screw, 30A,
30B...Light source, 31A, 31B...Photoreceptor.

Claims (1)

[Claims] 1. In a device for holding the wire bar when polishing the large diameter protrusion of the wire bar having the large diameter protrusion by rotating a polishing member provided in the polishing device, the wire bar A placing part on which the material is placed, a stopper part that presses the wire rod placed on this placing part and prevents the wire rod from moving toward the polishing member, and a stopper part placed on the placing part. a workrest having a relief portion for allowing a large-diameter protrusion of the wire rod to escape; and a moving means for moving the workrest relative to the abrasive member along a direction perpendicular to its axis. A device for holding the material to be polished.