JPS6230059B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rolling device that uses a pair of dies to roll a desired thread onto a thread material and at the same time applies various types of plastic deformation such as cutting or bending to the thread material.

Conventionally, screw parts that have been subjected to plastic processing include JIS B1177 hexagon socket set screws and screws with a skirt-like seat integrated at the bottom of the screw head as shown in Utility Model Publication No. 51-31978. There is. For example, one conventional device for hexagon socket set screws is to supply a pre-processed screw material without a head to a rolling device through a pipe using a vibrator, air, etc. There is a method that supports this screw material and rolls it. This equipment cannot use the mechanism of commonly used rolling equipment as is, and must be equipped with a special mechanism, which makes the rolling equipment itself expensive and increases the price of the product. ing. Moreover, it is very difficult to adjust the die, making it impossible to obtain products with stable rolling accuracy.

In addition, as another device, a screw material with a head having a flange portion that has been forged in advance is supplied to a rolling device using a device that aligns and feeds the material. The mountain is formed, and in the next process the brim is removed by cutting.
There are companies that manufacture hexagon socket set screws. However, even if this device is used, the number of processing steps increases, resulting in an increase in cost and a problem in that the product becomes expensive.

On the other hand, when forming a conical skirt on the lower surface of the screw head, the conical skirt is integrally formed on the lower surface of the threaded portion in advance, and then the screw material is suspended from the leg portion using an aligning and feeding device such as a shoot rail. There is a device that supplies the threads to a rolling device and forms threads on the legs, but with this device, the threads are only formed on the legs below the seat surface of the conical skirt. When the legs are screwed into a workpiece, there is a problem in that a sufficient loosening prevention effect cannot be expected.

The present invention is aimed at eliminating the above-mentioned drawbacks, and embodiments will be described below with reference to the drawings.

2 and 3 show a pair of rolling dies 10 and 20 for rolling a hexagonal socket set screw according to an embodiment of the present invention.
0 is a moving die. The rolling surface 11 of the moving die 10 has grooves inclined in the longitudinal direction corresponding to the desired threads, and the upper surface perpendicular to the rolling axis of the moving die 10 has rolling grooves. A machining block 30 that is parallel to the surface 11 and moves integrally with the movable die 10 is fixed. In the processing block 30, a reverse groove 31 is provided parallel to the rolled surface 11 of the moving die 10, and the inner wall 31a of the reverse groove 31 forms an edge formed by the upper surface of the moving die 10 and the rolled surface 11. It has a predetermined distance a from the portion 12. The distance a is such that the collar 42 of the screw material 40 shown in FIG. 6 passes through. The processing block 30 is attached to the upper surface of one of the dies, and has a sloped protruding wall 32 forming a groove 31.
The sloped protruding wall 32 is located on the upper surface of the mating die, and is formed so that the vertical cross section of the sloped protruding wall has an acute angle and tapers toward the mating die. Further, the tip of the sloped protruding wall 32 is inclined from the entrance side to the discharge side of the screw material 40, and the tip of the sloped protruding wall 32 touches the upper surface of the mating die at a position approaching the discharge side of the die. arranged to be close together.

The rolling surface 21 of the fixed die 20, which is opposite to the rolling surface 11 of the moving die 10, is provided with a groove for forming a thread in the thread material 40 in cooperation with the moving die 10. A guide portion 22 protrudes from the upper surface of the die 20 and is configured to cut the collar portion 42 in cooperation with the sloped protruding wall 32 of the processing block 30 fixed to the movable die 10. The height of the guide part 22 is equal to the top surface of the moving die 10.

When rolling a hexagon socket set screw with the above configuration, the screw material 40 having the flange portion 42 at the upper end is first rolled into dies 10, 20 one by one using an aligning and feeding device consisting of a shoot rail 50 or the like as shown in FIG. When the leg portion 41 of the screw material 40 is suspended and fed,
As shown in FIGS. 5 and 6, the screw material 40 is
The leg portion 41 is suspended and supported by the collar portion 42, the upper surface of the movable die 10, and the guide portion 22 of the fixed die 20, and forming of the thread of the leg portion 41 is started in the same manner as a general threaded part. The screw material 40 is fitted between the movable die 10 and the fixed die 20 shown in FIGS. 2 and 3, so that the movable die 10 is connected to the fixed die 20.
As the threaded material 40 moves from the entry side to the exit side, a desired thread is gradually formed on the leg portion 41.

When the thread material 40 is sent to the discharge side of the fixed die 20 while the thread is being formed, the tip of the sloped protruding wall 32 of the processing block 30 gradually comes into contact with the collar portion 42 of the thread material 40, as shown in FIG. As shown in FIG. 8, the screw material 40 is sent to the discharge side while rotating, so it gradually bites into the flange 42 and cuts the flange 42 as shown in FIGS. 9 and 10. The collar portion 42 of the blank 40 is removed and the threaded part is discharged from the discharge side, completing the rolling operation.

As mentioned above, since it manufactures hexagon socket set screws, it is possible to produce screw parts in large quantities by simply making some improvements to the conventional rolling equipment.
Furthermore, unlike conventional processes where the thread forming and flange removal processes were separated, the processes can be performed simultaneously, reducing manufacturing time and making it possible to provide the product at a lower cost.

Furthermore, FIGS. 11 to 19 show another embodiment, in which a conical skirt having elasticity is integrally provided at the lower part of the head 43, and thereby a screw having a locking effect is secured. Indicates the case of manufacturing. A processing block 3 is provided on the upper surface of the movable die 10, which has grooves cut into the rolling surface 11 as in the previous embodiment.
0 is fixed. The processing block 30 is also provided with a reverse groove 31, and the distance a from the edge 12 formed by the rolled surface 11 and the upper surface of the moving die 10 to the inner wall 31a of the reverse groove 31 of the processing block 30 is The distance is such that the flange portion 42 of the screw material 40 can sufficiently rotate through the distance.

The inclined protruding wall 32 extending from the entrance side to the discharge side of the movable die 10 so as to constitute the reverse groove 31 of the processing block 30 is connected to the movable die 1.
0, and a sloped portion 32b that gradually slopes downward so as to approach the head 43 of the screw material 40 that moves in parallel. The tip used to be rounded and is now shaped like an acute angle. The sloped protruding wall 32 is configured to project slightly to the right from the upper surface of the guide portion 22 formed on the upper surface of the fixed die 20 facing the movable die 10, as shown in FIG. 14, to perform the bending process. The movable die 10 also has an inclined surface 13 formed downwardly toward the discharge side from a position substantially equal to the boundary 32c between the parallel portion 32a and the inclined portion 32b of the inclined protruding wall 32 in the longitudinal direction; A parallel surface 14 is formed from the entrance side to the entry side.

A groove is formed in the rolling surface 21 of the fixed die 20 shown in FIG. 12 to cooperate with the rolling surface 11 of the movable die 10 to form a thread on the leg portion 41 of the screw material 40. The upper surface of the guide portion 22 of the fixed die 20 also has an inclined surface 23 extending downward from a position corresponding to the boundary 32c of the movable die 10 in the longitudinal direction to the discharge side of the fixed die 20. Further, the entrance side has a parallel surface 24 similar to the moving die 10, and the height of this parallel surface 24 is the same as the height of the parallel surface 14 of the moving die 10.

Next, the operation of this embodiment will be explained. A screw material 40 having a head 43 having a flange 42 formed in advance is inserted into the fixed die 2 for one piece as in the above embodiment.
0 and the movable die 10 from the shoot rail 50, it fits between the fixed die 20 and the movable die 10 as shown in FIGS. 14 and 15,
The moving die 10 starts moving to the left in FIG.

At this time, the lower surface of the collar portion 42 of the screw material 40 is in contact with the parallel surface 14 of the movable die 10 and the parallel surface 24 of the guide portion 22 of the fixed die 20. When the movable die 10 starts moving, the leg portion 41 of the screw material 40 fits between the dies 10 and 20 and rotates, so that a thread is formed and the dies 10 and 2
When the boundary between the zero inclined surfaces 13, 23 and the parallel surfaces 14, 24 is reached, the thread is almost formed.

Further, when the moving die 10 moves in the longitudinal direction, the moving die 10 moves as shown in FIGS. 16 and 17.
The inclined protruding wall 32 of the machining block 30 fixed at 0
gradually acts on the collar 42 of the screw material 40, and the collar 42 is bent downward. The positions of the dies 10 and 20 where this bending action occurs are on the inclined surface 1, respectively.
Moreover, since the thread material 40 is sandwiched between the pair of dies 10 and 20 and moves in parallel, the distance between the lower surface of the collar 42 and the inclined surfaces 13 and 23 of the dies 10 and 20 gradually increases. A wide gap is created in the gap, and at the same time, the collar portion 42 is gradually bent into a conical shape by the advancement of the moving die 10, and becomes a complete skirt.
It is discharged from the discharge side, and the rolling work is completed.

Through the above process, threads can be formed on the legs of the locking screw that are covered by the skirt, so that the locking screw can be screwed in completely and reliably, and the manufacturing process can be simplified. The product price is lower because it requires less compared to conventional methods.

In addition, in these examples, processing block 3
0 is fixed to moving die 10, but fixed die 2
Even if this is fixed to 0, the same effect will be achieved.

A processing block is attached to the top surface of one die,
The processing block is provided with a sloped protruding wall located on the upper surface of the mating die, and the vertical cross section of the sloped protruding wall is formed into an acute angle shape and tapered in the direction of the mating die. The tip of the sloped protruding wall is inclined from the entrance side to the discharge side of the die, and the tip of the sloped protruding wall is arranged so that it approaches the top surface of the opponent die at a position approaching the discharge side. During plastic processing of the part, especially when cutting, the amount of cutting is reduced, the cutting resistance is also reduced, and the influence on thread rolling is prevented, and the bending of the head part is processed, that is, the thread part is shaped into a skirt shape. This makes it possible to cover the parts, eliminate incomplete threads, and provide products with "0" incomplete threads, and also adds simple processing to a pair of dies that generally form the threads of threaded parts. It has extremely remarkable effects, such as being able to carry out the present invention with just one.

In addition, conventionally, many processes were required to complete threaded parts from wire rods, but the present invention makes it possible to reduce the number of processes, shorten the manufacturing time of threaded parts, and as a result, thread There are effects such as being able to provide parts at low cost.

[Brief explanation of the drawing]

Fig. 1 is a schematic view showing how the thread material is fed to the die, Fig. 2 is a perspective view of a moving die showing an embodiment of the present invention, Fig. 3 is a perspective view of a fixed die of this embodiment, and Fig. 3 is a perspective view of a moving die showing an embodiment of the present invention. 4 is a front view of FIG. 2, FIG. 5 is a cross-sectional view of the screw material 40 taken along line A-A in FIG.
Figure 6 is an enlarged sectional view of the main part of Figure 5, and Figure 7 is an enlarged sectional view of the main part of Figure 4.
Figure 8 is an enlarged cross-sectional view of the main part of Figure 7, Figure 9 is a cross-sectional view of the screw material taken along line C-C in Figure 4, Figure 10 is a cross-sectional view of the screw material taken along line B-B in Figure FIG. 9 is an enlarged sectional view of the main part, FIG. 11 is a perspective view of a moving die showing another embodiment of the present invention, FIG. 12 is a perspective view of a fixed die of this embodiment, and FIG. 14 is a sectional view showing the screw material taken along the line D-D in FIG. 13, FIG. 15 is an enlarged sectional view of the main part of FIG. 14, and FIG. 16 is the screw taken along the line E-E in FIG. 13. A sectional view showing the material, Fig. 17 is an enlarged sectional view of the main part of Fig. 16, Fig. 18 is a sectional view showing the thread material taken along line F-F in Fig. 13, and Fig. 19 is an enlarged main part of Fig. 18. FIG. ...Entry side, ...Discharge side, 10...Moving die, 11...Rolled surface, 12...Edge, 13...
Inclined surface, 14...Parallel surface, 20...Fixed die,
21... Rolled surface, 22... Guide portion, 23... Inclined surface, 24... Parallel surface, 30... Machining block,
31... Reverse concave groove, 31a... Inner wall, 32... Inclined protruding wall, 32a... Parallel part, 32b... Inclined part,
32c...Boundary, 40...Screw material, 41...Legs, 42...Brim portion, 43...Head, 50...Shoot rail.

Claims (1)

[Scope of Claims] 1. A pair of dies are provided opposite to each other and are provided with grooves for forming a desired thread by sandwiching the legs of a screw material having a flange portion, and the pair of dies facing each other are provided oppositely. It is configured to perform relative movement, and a machining block is attached to the top surface of one of the dies.
The processing block is provided with a sloped protruding wall located on the upper surface of the mating die, and the vertical cross section of the sloped protruding wall is formed to have an acute angle and a tapered shape in the direction of the mating die. A screw characterized in that the tip of the sloped protruding wall is inclined from the entrance side to the discharge side of the die, and the tip of the sloped protruding wall is arranged so as to approach the upper surface of the mating die at a position approaching the discharge side. Parts rolling equipment.