JP2001001095A - Roller type thread-rolling round die and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roller type thread-rolling round die with which a shaft- like member having a male-screw, etc., can be rolled by plastically deforming the peripheral surface of a blank to be rolled, by reutilizing a planetary round die which is used by engaging with the main shaft in a planetary type thread- rolling machine and to provide a manufacturing method therefor. SOLUTION: The outside member of the thread-rolling round die is formed into a new screw part by machining or grinding in a screw part reforming process 22 after removing the screw part from the planetary round die 10 by machining or grinding in a screw part removing process 21. After the screw reforming process 22, a chamfer, etc., of the edge surface of the new screw part is applied in a finishing process 23 and transferred into a fitting process 41. On the other hand, a core member is manufactured with processes 31-36 different from the process for the outside member and fitted into the hole part in the outside member in the fitting process 41 to complete the thread-rolling die for screw. In such a way, the outside member is manufactured with the planetary round die 10 used by engaging with the main shaft in the planetary type thread-rolling machine as the blank to be thread-rolled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller type rolling round die used by being engaged with a main shaft of a roller type rolling machine and a method of manufacturing the same, and more particularly, to engaging with a main shaft of a planetary type rolling machine. The present invention relates to a roller type rolled round die that reuses a planetary round die used and a method for manufacturing the same.

[0002]

2. Description of the Related Art A rolling die is a tool for forming an axial member (for example, a screw part) having a screw or the like by plastically deforming the outer peripheral surface of a cylindrical screw material (blank). JIS standard B4501 (screw rolling round die) and J
It is standardized in IS standard B4502 (thread rolling flat die). On the other hand, in the industry, in addition to the rolling dies according to these JIS standards, for example, a set of planetary rolling dies including a planetary round die and a segment die are used.

FIG. 5 is a plan view of a planetary rolling machine 100. The planetary rolling machine 100 is moved in one direction (FIG. 5).
The main shaft 101 is rotated in a counterclockwise direction. A planetary round die 10 is engaged with the main shaft 101. The planetary round die 10 is a member that rolls a threaded part having a screw by plastically deforming the outer peripheral surface of the substantially cylindrical blank B, and is suitable for rolling such as alloy tool steel or high-speed tool steel. It is formed in a cylindrical shape (ring shape) with a metal material.

[0004] On the outer peripheral surface of the planetary round die 10, a thread portion 10a suitable for a male thread to be rolled into the blank B is formed. A hole 10b, which is a substantially cylindrical cavity, is formed inside the planetary round die 10, and the main shaft 101 is inserted into the hole 10b. Further, a die key groove 10c is formed at one position on the inner peripheral surface of the hole 10b of the planetary round die 10 in correspondence with the shaft key groove 101a formed in the main shaft 101. Key 1 in both keyways 10c, 101a
02, the planetary rolling machine 1
The main shaft 101 and the planetary round die 10 are engaged with each other.

On the other hand, a segment die 11 held by a segment holder 103 is disposed outside the outer peripheral surface of the planetary round die 10. The segment die 11 is a member for holding a blank B together with the planetary round die 10 and plastically deforming the outer peripheral surface of the blank B to form a threaded part having a screw.
Like the planetary round die 10, it is formed in a substantially arc shape (fan shape) with a metal material such as alloy tool steel or high-speed tool steel suitable for rolling.

[0006] On the inner peripheral surface of the segment die 11, a screw surface 11a suitable for a male screw to be rolled into the blank B is formed, and both the screw surface 11a and the screw portion 10a of the planetary round die 10 are used. Screws are rolled on the outer peripheral surface of the blank B held between the dies 10 and 11. In the planetary rolling machine 100, the blank B is filled with a planetary round die 10 and a segment die 11.
And a blank supply device (not shown) for supplying the blank supply device to the gap between the dies 10 and 11.

The blank B supplied from the blank supply device is supplied to both dies 10,
The blank B is fed into the gap 11. The fed blank B is rotated in the opposite direction (clockwise in FIG. 5) to the rotation direction of the planetary round die 10 with the rotation of the planetary round die 10 by the main shaft 101.
It is transported in the rotation direction of the planetary round die 10. With the transfer, the outer peripheral surface of the blank B is plastically deformed by the threaded portion 10a of the planetary round die 10 and the threaded surface 11a of the segment die 11, so that an external thread is formed.

By the way, the above-mentioned planetary round die 10
Are discarded when the screw portion 10a is worn. On the other hand, mineral resources such as metal materials, which are the raw materials of the planetary round die 10, are collected from nature, and excessive collection leads to destruction of nature, which is not preferable. Its resources are finite. Therefore, there is a need to reuse the planetary round dice 10 in order to effectively use such resources. As a method of reusing (regenerating) the planetary round die 10, for example, a worn screw portion 10 a is removed from the outer peripheral surface of the planetary round die 10 by grinding or cutting, and a new screw portion (hereinafter, referred to as “hereinafter”) is formed on the outer peripheral surface.
This column and the next column will be referred to as “regenerated screw part”. ) May be reshaped by grinding or cutting and used together with the segment die 11 in the planetary rolling machine 100.

[0009]

However, the planetary round dies reproduced from the planetary round dies 10 (hereinafter, referred to as “reproduced planetary round dies” in this section) cover the outer peripheral surface of the planetary round dies 10. It is formed (manufactured) by removing it by cutting or grinding. For this reason, the outer diameter of the recycled planetary round die is smaller than the outer diameter of the planetary round die 10, and thus cannot be used for rolling by the planetary rolling machine 100 together with the segment die 11. Therefore, there is a problem that the planetary round dice 10 must be discarded without being reused.

When the recycled planetary round die is used together with the segment die 11 in the planetary rolling mill 100, the number of the regenerated thread portions of the regenerated planetary round die is equal to the number of the thread portions 10a of the planetary round die 10. There is a need to. Also, the lead angle of the regenerated planetary round die or the planetary round die 10 must match the lead angle of the segment die 11 used therewith, and the regenerated planetary round die or the planetary round die 10
Should match the pitch of the segment dies 11 used with them.

However, since the outer diameter of the regenerated planetary round die is smaller than the outer diameter of the planetary round die 10, the number of the regeneration screw portions of the regenerated planetary round die and the number of the planetary round die 10 are small. Screw part 10a
And the lead angle of the recycled planetary round die becomes larger than the lead angle of the segment die 11, and it becomes impossible to form a screw on the blank B.

Further, since the outer diameter of the regenerated planetary round die is smaller than the outer diameter of the planetary round die 10, for example, when the regenerated planetary round die is engaged with the main shaft 101 of the planetary rolling machine 100, the regenerated planetary round die is disengaged. The gap width between the die and the segment die 11 increases. Therefore, in such a case, the blank B cannot be sandwiched between the recycled planetary round die and the segment die 11, so that a screw cannot be rolled on the outer peripheral surface of the blank B.

The main shaft 1 of the planetary rolling machine 100
It is conceivable to adjust the width of the gap between the recycled planetary round die and the segment die 11 by changing the position of No. 01, but in such a case, it is necessary to make design changes or improvements to the planetary rolling machine 100. Thus, there is a problem that such a design change or improvement requires a large cost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a planetary round die used by being engaged with a main shaft of a planetary rolling machine is reused to reduce the material to be rolled. An object of the present invention is to provide a roller-type rolled round die capable of rolling an axial member having a screw or the like by plastically deforming the outer peripheral surface, and a method for manufacturing the same.

[0015]

According to a first aspect of the present invention, there is provided a method of manufacturing a roller-type rolled circular die, wherein the outer peripheral surface of a material to be rolled is plastically deformed. A method of manufacturing a roller-type rolled round die, which is provided with a roller-type screw portion for rolling a shaft-like member having a screw or the like and is used by being engaged with a main shaft of a roller-type rolling machine,
A ring-shaped planetary round die that can be engaged with the main shaft of a planetary rolling machine with a planetary screw part that is provided on the outer peripheral surface to hold the material to be rolled together with the arc-shaped segment die and roll the screws etc. As a raw material, an outer member forming step of removing the planetary screw portion from the planetary round die, forming the outer member by forming the roller screw portion on the outer peripheral surface of the planetary round die, and an outer member forming step Is performed separately, a core member forming step of forming a core member engageable with the main shaft of the roller type rolling machine, and a core member formed by the core member forming step and the outer member forming step. And a fitting step of fitting the outer member formed by the process to each other.

According to a second aspect of the present invention, there is provided a roller-type rolled round die.
A roller-type screw portion is formed to abut on the outer peripheral surface of the material to be rolled, and to plastically deform the outer peripheral surface to roll a shaft-like member having a screw or the like, and is engaged with a main shaft of the roller-type rolling machine. The roller type screw portion is formed so as to be fitted to an outer member formed on an outer peripheral surface and an inner periphery of the outer member, and is engageable with a main shaft of the roller type rolling machine. The outer member is a planetary type having an outer peripheral surface provided with a planetary screw part for holding a material to be rolled together with an arc-shaped segment die and rolling a screw or the like. It is composed of a ring-shaped planetary round die that can be engaged with the main shaft of the rolling machine, by removing the planetary screw portion from the planetary round die, and forming the roller type screw portion on the outer peripheral surface of the planetary round die. Is formed.

According to a third aspect of the present invention, there is provided a roller-type rolled round die.
3. The roller-type rolled round die according to claim 2, wherein the roller-type rolling die includes two or more main shafts formed to be able to engage with each of the two or more roller-type rolled round dies. Two or more spindles hold the material to be rolled between the two or more roller-formed rolling dies, and abut the two or more roller-type rolling dies on the outer peripheral surface of the material to be rolled. By rotating the material to be rolled, the outer peripheral surface of the material to be rolled is plastically deformed to form a shaft-like member having a screw or the like.

According to a fourth aspect of the present invention, there is provided a roller-type rolled round die.
3. The roller-type rolled round die according to claim 2, wherein the roller-type rolling die includes a main shaft formed so as to be able to engage with the roller-type rolled circular die, and the main shaft is formed by the roller-type rolled die. By rotating the round die in contact with the outer peripheral surface of the material to be rolled, the outer peripheral surface of the material to be rolled is plastically deformed to form a shaft-like member having screws and the like. I have.

According to a fifth aspect of the present invention, there is provided a roller-type rolled round die.
5. The roller-type rolled round die according to claim 2, wherein the core member is detachably fitted to an inner periphery of the outer member. 6.

[0020] The roller-type rolled circular die according to claim 6 is characterized in that:
The roller-type rolling round die according to any one of claims 2 to 5, wherein the inner diameter of the outer member and the outer diameter of the core member are formed to be approximately 127 mm, and the inner diameter of the core member is approximately 54 mm. It is formed in the range of 85 mm.

[0021]

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a front view of a roller type rolling machine 50 using a thread rolling round die 1 according to one embodiment of the present invention. The arrow X in FIG.
Indicates the direction of movement of the piston 55c of the main shaft moving device 55, and the arrow R indicates the direction of rotation of the pair of main shafts 51, 52, that is, the direction of rotation of the thread rolling round dies 1, 1.

As shown in FIG. 1, a roller type rolling machine 50
Is mainly provided with a pair of main shafts 51 and 52 and a support table 53 on which both the main shafts 5 and 52 are disposed. The pair of main shafts 51 and 52 are provided with thread rolling round dies 1 and 1, respectively. The thread rolling round dies 1, 1 are inserted and engaged with the main shafts 51, 52 by keys 51a, 52a, respectively. The pair of main shafts 51, 52
Is configured to be synchronously rotated in the same direction (the direction of the arrow R in FIG. 1, that is, the counterclockwise direction) by a driving device (not shown) including a driving motor and a speed reducer, The pair of thread rolling round dies 1, 1 is driven to rotate in the direction of arrow R in FIG. 1 by the rotation of the main spindles 51, 52, respectively.

A substantially plate-like support blade 54 attached to a support table 53 is provided below a portion between the pair of thread rolling round dies 1 and 1.
Is erected. The support blade 54 supports, from below, a substantially cylindrical blank B0 on which male threads are rolled by a pair of thread-rolled round dies 1 and 1, and a blank B0 is provided on the upper end surface of the support blade 54. Is placed. The blank B0 is an intermediate product obtained by cutting or plastically processing a round bar-shaped steel material or the like as a material of a screw component, and a screw is formed on an outer peripheral surface of the blank B0.

The main shaft 52 (right side in FIG. 1) is
1 is connected to one end of a rod 55a of a spindle moving device 55 disposed on the opposite side (right side in FIG. 1). The spindle moving device 55 is constituted by a hydraulic cylinder,
2, a piston 55b fixed to the other end (right side in FIG. 1) of the rod 55a, and a cylinder 55c for accommodating the piston 55b.

According to the main spindle moving device 55, by adjusting the hydraulic pressure supplied into the cylinder 55c, the piston 55b is moved to the side where the main shaft 51 is disposed (to the left in FIG. 1, ie, the arrow X direction) or to the main shaft. 51 is moved toward the opposite side (rightward in FIG. 1, that is, in the direction opposite to the arrow X). With the movement of the piston 55b, the main shaft 52 connected to the rod 55a moves toward the side where the main shaft 51 is disposed (in the direction of arrow X in FIG. 1) or the side opposite to the main shaft 51 (in the direction opposite to arrow X in FIG. 1). It is moved toward.

In this embodiment, the spindle moving device 55 is constituted by a hydraulic cylinder. However, the constitution of the spindle moving device is not necessarily limited to this. For example, the spindle 52 is formed by using a cam mechanism. You may comprise so that the power which moves may be supplied. That is, any device can be used as long as it can supply power for relatively moving the pair of main shafts 51 and 52 toward or away from each other.

According to the roller type rolling machine 50, the support blade 54
When the blank B0 is placed on the upper end surface of the main shaft 51, the main shaft 52 is moved toward the side where the main shaft 51 is provided by the main shaft moving device 55, and the pair of thread rolling round dies 1, 1 is brought close to each other.
When the pair of thread-rolled round dies 1, 1 is brought close to each other, the blank B0 is sandwiched between the pair of thread-rolled round dies 1, 1, and the outer peripheral surface of the blank B0 is provided with the screw-rolled round dies 1, 1. The outer peripheral surface is pressed. On the other hand, a pair of thread rolled round dies 1 and 1 are
That is, the outer peripheral surface of the blank B0 held by the thread-rolled round dies 1, 1 is rotated by the rotation of the pair of thread-rolled round dies 1, 1 in synchronization with the direction of arrow R in FIG. Is plastically deformed and the screw is rolled.

Next, the thread rolled round die 1 will be described with reference to FIG. FIG. 2A is a front view of the thread-rolled round die 1 in the present embodiment, and FIG. 2B is a side sectional view taken along line BB in FIG. 2A.

The thread rolling round die 1 is engaged with the main shafts 51 and 52 of the roller type rolling machine 50 described above, and the blank B0 is formed.
This is a tool for rolling a screw by plastically deforming the outer peripheral surface (see FIG. 1). The thread rolled round die 1 is mainly formed by fitting two members of an outer member 2 and a core member 3 and engaging the core member 3 with the outer member 2 by a key 4. The outer member 2 is a member that rolls a screw part having a screw by plastically deforming the outer peripheral surface of the substantially cylindrical blank B0, and is a metal material such as alloy tool steel or high-speed tool steel suitable for rolling. And is formed in a cylindrical shape (ring shape).

A screw portion 2a is provided on the outer peripheral surface of the outer member 2, and the screw portion 2a forms a screw on the outer peripheral surface of the blank B0 held between the rolling dies 1,1. It is. A hole 2b, which is a substantially cylindrical cavity, is provided inside the outer member 2, and a core member 3, which will be described later, is fitted in the hole 2b.
Further, a key groove 2c, which is a substantially U-shaped concave portion as viewed from the front, is formed at one location on the inner peripheral surface of the hole 2b of the outer member 2. Core member 3
And a key 4 for engaging with. Therefore, the outer member 2 and the core member 3 to be described later are
Can be detachably engaged.

The outer member 2 is engaged with the main shaft 101 of the planetary rolling machine 100 shown in FIG.
Is formed by a planetary round die 10 for forming a screw by rolling the screw while removing the screw portion 10a from the outer peripheral surface of the planetary round die 10 which is the raw material (material). ).

That is, in the outer member 2, the hole 2 a and the key groove 2 c are used as it is as the hole 10 b and the key groove 10 c of the planetary round die 10 which is a raw material of the outer member 2. The portion 2b and the keyway 2c have the same shape and the same dimensions as the hole 10b and the keyway 10c of the planetary round die 10. The details of the method of manufacturing the outer member 2 will be described later.

The core member 3 is a member that is inserted into and engaged with the main shaft 51 (or the main shaft 52) of the roller type rolling machine 50, and is not a member that plastically deforms the outer peripheral surface of the blank B0. The member 2 is formed of an inexpensive metal material different from the member 2, for example, carbon steel or the like. The core member 3 is formed in a cylindrical shape (ring shape), and its outer diameter is slightly smaller than the inner diameter of the outer member 2 so as to be detachably fitted to the inner periphery (inside) of the outer member. Are formed small so as to be provided. That is, the core member 3 and the outer member 2 are formed such that the fit is “clear fit”.

In the inner periphery of the core member 3, there is provided a hole 3a which is a substantially cylindrical cavity formed so that the main shaft 51 (or main shaft 52) of the roller type rolling machine 50 can be inserted. ing. In addition, a key groove 3b, which is a substantially U-shaped concave portion as viewed from the front, is recessed at one location on the inner peripheral surface of the hole 3a of the core member 3, and the key groove 3b is provided with a roller type roller. Build 5
Key 51 engaged with the main shaft 51 (or main shaft 52)
a (or the key 52a) is formed so as to be insertable.

The thread rolling round die 1 has an outer diameter from the main shaft 51 (or the main shaft 52) of the roller type rolling machine 50 through the core member 3 fitted into the hole 2b of the outer member 2. Even if the outer member 2 is manufactured from the planetary round die 10 engaged with the main shaft 101 of the planetary rolling machine 100 having a large
(Or the main shaft 52).

Further, at one location on the outer peripheral surface of the core member 3,
A key groove 3c, which is a substantially U-shaped concave portion when viewed from the front, is formed in a concave shape. The key groove 3c is formed so that the key 4 inserted in the key groove 2c of the outer member 2 can be inserted. The core member 3 is engaged with the hole 2b of the outer member 2 by the key 4. The key groove 3c and the key groove 3b are
The core member 3 is recessed at a different position in the circumferential direction, for example, at a position shifted by approximately 180 ° in the circumferential direction of the core member 3. In this manner, the key grooves 3b and 3c are shifted in the recessed position, so that the key grooves 3b and 3c are recessed at substantially the same position in the circumferential direction of the core member 3 as compared with the case where the core grooves 3b and 3c are recessed. Of the core member 3 in the radial direction, that is, the difference between the outer diameter and the inner diameter of the core member 3 is prevented from decreasing, so that the rigidity of the core member 3 is prevented from lowering due to the decrease in the thickness. You can do it.

Next, with reference to FIG. 3, a description will be given of a manufacturing process of the thread rolling round die 1 configured as described above. FIG.
FIG. 2 is a view showing a manufacturing process of the thread rolled round die 1.
First, in the manufacturing process of the outer member 2, a screw portion removing process 21 is performed.
After the screw part 10a is removed from the planetary round die 10 by cutting or grinding, the screw part reshaping step 2
In 2, the screw portion 2a is formed again by cutting or grinding. After this screw part reshaping step 22, a finishing step 2
3, the end surface of the threaded portion 2a is chamfered, and, if necessary, the threaded portion 2a is subjected to a surface treatment by shot peening or nitriding in a surface treatment step 24, so that the outer member 2 is manufactured. Complete. The manufactured outer member 2 is transferred to the fitting step 41.

On the other hand, in the manufacturing process of the core member 3, the hollow round bar material 30 used as the material of the core member 3 is cut into a predetermined size by the hollow round bar cutting process 31, and then the raw finishing process is performed. At 32, the outer diameter, width, and hole 3a are raw finished, and then attached to a broaching machine, and the key groove 3b is machined into the hole 3a finished by the first key groove machining step 33. Thereafter, the second keyway processing step 3 is further performed.
In 4, the keyway 3c is machined on the outer peripheral surface by an end mill such as a vertical milling machine, and the manufacture of the core member 3 is completed. The manufactured core member 3 is transferred to the fitting step 41.

Further, the core member 3 is subjected to a heat treatment such as quenching and tempering in a heat treatment step 35 after the second key groove processing step 34, and is subjected to grinding or cutting in a finishing step 36, so that the outer diameter is reduced. , Width and inner diameter are finished.

As described above, the outer member 2 and the core member 3
Are separate processes 21 to 2 until the fitting process 41
Since the members 2 and 3 are manufactured, the members 2 and 3 can be manufactured simultaneously in separate steps, and the manufacturing efficiency can be improved. In addition, since the two members 2 and 3 manufactured separately are reduced in weight correspondingly, the two members 2 and 3 are reduced.
3 can be easily transported.

The separately produced outer member 2 and core member 3 are fitted together in a fitting step 41. At the time of such fitting, the key 4 is inserted into the key groove 2c of the outer member 2 and the key groove 3c of the core member 3, and the outer member 2 and the core member 3 are engaged by the key 4. Then, the thread rolling round die 1 is completed.

When the thread 2a of the outer member 2 of the thread rolling round die 1 of this embodiment is damaged due to abrasion or the like,
Further, by performing the above steps 21 to 23 on the outer member 2, the outer member 2 can be reused further.

As described above, according to the thread rolling round die 1 of this embodiment and the method of manufacturing the same, the outer member 2 that plastically deforms the outer peripheral surface of the blank B0 is provided with the main shaft of the planetary rolling machine 100. Since the planetary round die 10 used by being engaged with the 101 is used as a raw material, for example, the planetary round die 10 damaged by abrasion or the like can be reused without being discarded. Also, since the outer member 2 is formed by reusing the planetary round dies 10,
There is no need to newly collect and purify mineral resources such as metal materials used as the material of the outer member 2, and it is possible to reduce the amount of used (collected) mineral resources and protect the natural environment. It is.

The outer member 2 is formed by reusing the planetary round die 10 to form a blank B on the outer peripheral surface thereof.
Since it can be manufactured simply by reshaping the screw portion 2a for rolling a screw to 0, it is necessary to cut a round or cylindrical metal material and process the hole portion 2b and the key groove 2c. Therefore, the manufacturing cost of the thread rolled round die 1 can be reduced accordingly. That is, according to the method of manufacturing the thread-rolled round die 1 of the present embodiment, the manufacturing cost is reduced as compared with the case of manufacturing a thread-rolled round die by processing a round bar or cylindrical metal material from scratch. You can do it.

Further, in the thread rolling round die 1, the outer member 2 and the core member 3 are engaged by the key 4, and the fit between the outer member 2 and the core member 3 is “clear fit”. Since the key 4 is removed, the core member 3 is removed because the key 4 is fitted to the outer member 2 and the core member 3 is removed.
Can be fitted to another outer member 2. Therefore, since one core member 3 can be reused for a plurality of outer members 2, when there are a plurality of outer members 2 in which the planetary round dies 10 are reused, each of these outer members 2
Therefore, it is not necessary to manufacture the core members 3 one by one, and the manufacturing cost of the thread rolling round die 1 can be reduced accordingly.

In order to replace the thread rolling round die 1 with the main shaft 51 (or the main shaft 52) of the roller type rolling machine 50 and the main shaft of another roller type rolling machine having a different outer diameter, a roller type rolling machine is used. The core member 3 engageable with the main shaft 51 (or the main shaft 52) of the board 50 is removed from the outer member 2, and a hole engageable with the main shaft of another roller type rolling machine is formed on the inner periphery of the outer member 2. Part 3a
By fitting another core member 3 provided with
The two outer members 2 can be reused for two or more roller type rolling machines having different main shaft outer diameters.

Referring now to FIG. 4, the dimensions of planetary round dies 10 used as the material of outer member 2 and the thread rolling dies manufactured through the above-described steps using planetary round dies 10 will be described. The dimensions of the outer member 2 and the core member 3 of the die 1 will be exemplified. FIG. 4 is a view exemplifying the outer member 2, the core member 3 of the thread rolling round die 1, and the planetary round die 10 which is a material of the outer member 2. Planetary round die 10 and its planetary round die 10
It is the figure which illustrated the outer member 2 and the core member 3 of the thread rolling round die 1 manufactured using. In the planetary round die 10 having a nominal size of M8 × 1.25, the outside diameter of the screw formed by the planetary rolling machine 100 is, for example, 173.
32mm, inner diameter is 127mm, keyway dimension is 13mm,
The number of threads of the screw portion 10a is 24 and the lead angle is approximately 3.153.
6 °.

On the other hand, the outer diameter of the main shaft 51 (or main shaft 52) of the roller type rolling machine 50 to be used is 54 mm, and the type of the thread to be rolled is M8 × 1.25 type 5 type thread rolling. In the round die 1, as the outer member 2 manufactured by reusing the planetary round die 10, the outer diameter is 166 mm, the number of threads 2a is 23,
The outer member 2 having a lead angle of approximately 3.1536 ° is manufactured. On the other hand, as the core member 3,
The core member 3 having an outer diameter of 127 mm, a hole diameter of 54 mm, and a keyway dimension of 12 mm is manufactured by the steps # 36 to # 36.

The outer member 2 manufactured by reusing the planetary round die 10 having an inner diameter of 127 mm is mainly composed of a type 4 to 6 type thread rolling round die used for a roller type rolling machine 50. 1 can be used. This type 4 to 6 thread rolling round die 1 has an outer diameter of
That is, the outer diameter of the outer member 2 is larger than the inner diameter of the planetary round die 10 (for example, 12).
(In the range of 8.8 mm to 208.5). In addition, specifically, when the outer diameter of the planetary round die 10 is 173, 32 mm and the inner diameter is 127 mm, for example, the outer diameter of the outer member 2 is 144.1 mm to 14.1 mm.
It can be formed in a range of 68.4 mm.

On the other hand, the core member 3 is formed to have an outer diameter of 127 mm so as to match the inner diameter of the outer member 2. Here, the hole diameter of the thread rolling round die 1 of the type 6 type, that is, the inner diameter of the core member 3 (70 mm or 85 mm)
There is also a roller type rolling machine having a main shaft having a larger outer diameter (for example, 100 mm). However, when the hole 3a of the core member 3 is formed so that such a main shaft can be inserted, the outer diameter of the core member 3 is reduced. The thickness of the core member 3, which is the difference in thickness from the inner diameter, is reduced, and the rigidity of the core member 3 is reduced. However, the core member 3 of the present embodiment is used for the thread rolling round dies 1 of types 4 to 6 and the inner diameter of the hole 3a is 54 mm, 70 mm or 85 mm. The thickness of the core member 3 is sufficiently provided to prevent a decrease in the rigidity of the core member 3 and to prevent the core member 3 from being damaged.

The core member 3 has an outer diameter of 127 m.
m, and three types of core members 3 with hole diameters of 54 mm, 70 mm and 85 mm and keyway dimensions of 12 mm, 15 mm and 18 mm are prepared. The round die 1 can be manufactured, and one outer member 2 can be reused for three types of roller type rolling machines having different main shaft outer diameters.

As described above, the present invention has been described based on the embodiments. However, the present invention is not limited to the above-described embodiments, and various improvements and modifications can be made without departing from the gist of the present invention. Can easily be inferred.

For example, in the above embodiment, the outer member 2 and the core member 3 are engaged with each other by the key 4. However, the method of fitting the two members 2 and 3 is not necessarily limited to this. For example, the outer diameter of the core member 3 is formed so that the fit between the two members 2 and 3 is a tight fit. Then, for example, the outer member 2 and the core member 3 may be fitted by a hydraulic press.

In such a case, the core member 3 is formed of a material having a large thermal expansion due to the heat treatment, and the members 2 and 3 integrated by fitting are subjected to a heat treatment to fix the members 2 and 3 together. You may. Specifically, the two members 2, which are integrated,
3 may be quenched at about 1050 ° C. and then tempered at about 500 ° C. to expand the core member 3 and fix the core member 3 and the outer member 2 together. It should be noted that the respective temperatures of quenching and tempering in the heat treatment can be appropriately changed in accordance with the materials used and the like.

Further, in order to facilitate the fitting of the two members 2 and 3 without using a press machine or the like, the inner diameter of the outer member 2 and the outer diameter of the core member 3 are loosely fitted or As an intermediate fit, an adhesive that is cured by heating may be applied to the inner wall of the outer member 2 or the outer wall of the core member 3 so as to firmly fix the members 2 and 3 after the heat treatment. . If an adhesive that expands by heating is used as such an adhesive, the fixed state of the two members 2 and 3 can be further strengthened. In the case where the inner diameter of the outer member 2 and the outer diameter of the core member 3 are set to the interference fit, both members 2 and
An adhesive may be applied between the three.

In the thread rolling round die 1 of this embodiment, one keyway 3b is provided in the hole 3a of the core member 3. However, it is naturally possible to apply the present invention also to a core member provided with two or more keyways, or provided with no keyways. Further, an uneven spline is provided around the outer peripheral surface of the core member 3, and an engagement groove into which the spline can be fitted is provided around the inner peripheral surface of the outer member 2, so that the spline and the engagement are formed. The outer member 2 and the core member 3 may be fitted and engaged by the groove.

In this embodiment, as a rolling machine in which the thread rolled round die 1 is used, a two-wheel machine having a pair of main shafts 51 and 52 is used.
Although the roller type rolling machine 50 of the axial type has been described as an example, the rolling machine in which the thread rolling round die 1 is used is not limited to this. The die 1 is engaged, and the thread-rolled round die 1 is pressed against the outer peripheral surface of the blank to roll a screw. The present invention is also applicable to a three-axis roller-type rolling machine in which the dies 1 are engaged with each other and the blank is sandwiched by three or more thread rolling round dies 1 and threads are rolled on the outer peripheral surface of the blank. It is of course possible to apply.

In the present embodiment, the thread rolling round die 1 was manufactured by manufacturing the outer member 2 by reusing the planetary round die 10. However, when manufacturing the outer member 2, the outer member 2 may be manufactured by processing a cylindrical metal material from scratch without reusing the planetary round dies 10. In such a case, compared to the case where a conventional round rod-shaped metal material is processed to manufacture a thread-rolled round die, a solid round bar-shaped metal material is formed by the amount of the material to be processed being formed into a cylindrical shape. Material cost can be further reduced. Further, since the hollow cylindrical metal material used as the material of the outer member 2 is less hollow than the round bar having the same outer diameter, the amount of the metal material used is small, so that resources can be saved. It is.

[0059]

According to the roller type rolling round die of the present invention and the method for manufacturing the same, the outer member for plastically deforming the outer peripheral surface of the material to be rolled is engaged with the main shaft of the planetary rolling machine. Since the used planetary round dies are used as a raw material, there is an effect that, for example, the planetary round dies damaged by abrasion or the like can be reused without being discarded. In addition, since the outer member is formed by reusing planetary round dies, it is not necessary to newly collect and purify mineral resources such as metal materials as the material of the outer member. Amount) can be reduced, and the natural environment can be protected.

Further, since the outer member is manufactured by simply removing the planetary screw portion from the outer peripheral surface of the planetary round die and forming the roller screw portion, for example, a material such as a round bar material or a cylindrical material is used. There is no need to manufacture the outer member by processing from the beginning, and there is an effect that the manufacturing cost of the roller-type rolled round die can be reduced accordingly.

Further, in the roller-type rolled round die according to the fifth aspect, the core member formed to be fittable on the inner periphery of the outer member is removably fitted to the inner periphery of the outer member. For example, a core member fitted to the inner periphery of one outer member can be removed from the one outer member and fitted to the inner periphery of another outer member for use. Therefore, since one core member can be reused for a plurality of outer members, when there are a plurality of outer members obtained by reusing planetary round dies, it is necessary to manufacture a core member for each of these outer members. There is no. Therefore, there is an effect that the manufacturing cost of the roller-type rolled round die can be reduced.

Further, when the roller-type rolled round dies are replaced from one roller-type rolled die to another roller-type rolled die, the outer diameter (spindle diameter) of the main shaft of each roller-type rolled die is different. In such a case, the core member that can be engaged with the main shaft of one roller-type rolling machine is removed from the outer member, and the inner periphery of the outer member can be engaged with the main shaft of another roller-type rolling machine. By fitting another core member, there is an effect that one outer member can be reused for two or more roller type rolling machines having different outer diameters of the main shaft.

By the way, there is a predetermined standard between the main shaft diameter of the roller type rolling machine and the outer diameter (that is, the outer diameter of the outer member) and the inner diameter (the inner diameter of the core member) of the roller type rolling round die. Is stipulated. When the main shaft diameter of the roller-type rolling machine is less than approximately 54 mm, for example, 40 mm or less, the outer diameter of the roller-type rolling round die, that is, the outer diameter of the outer member is 99.6 m.
m. For this reason, when the main shaft diameter of the roller type rolling machine is less than approximately 54 mm, for example, a planetary round die having an inner diameter of approximately 127 mm can be reused as a raw material of the outer member of the roller type rolling round die. Can not.

On the other hand, the main shaft diameter of the roller type rolling machine is approximately 85 m.
m, for example, 100 mm,
It is necessary to form the inner diameter of the roller-type rolled round die, that is, the inner diameter of the core member, at 100 mm, which is substantially equal to the main shaft diameter. For this reason, for example, when a planetary round die having an inner diameter of approximately 127 mm is reused as a raw material of the outer member of the roller type rolling round die, the core member needs to have an outer diameter of 127 mm and an inner diameter of 100 mm. Therefore, the difference between the inner diameter and the outer diameter of the core member is reduced, and a sufficient thickness cannot be provided between the outer circumference and the inner circumference of the core member, and the rigidity of the core member is reduced. I will.

However, in the roller-type rolled round die according to the sixth aspect, the inner diameter of the outer member and the outer diameter of the core member are substantially equal to one another.
27 mm and the inner diameter of the core member is approximately 54 m
m to 85 mm.
When manufacturing a roller-type rolled round die by reusing a 7 mm planetary round die, the outer diameter of the outer member can be formed larger than the inner diameter of the outer member, and the inner and outer circumferences of the core member can be formed. There is an effect that a sufficient thickness can be provided between the core member and the periphery to maintain the rigidity of the core member.

[Brief description of the drawings]

FIG. 1 is a front view of a roller-type rolling machine using a thread-rolled round die according to one embodiment of the present invention.

FIG. 2A is a front view of a thread-rolled round die, and FIG. 2B is a side sectional view taken along line BB in FIG.

FIG. 3 is a view showing a manufacturing process of a thread rolled round die.

FIG. 4 is a view exemplifying an outer member, a core member, and a planetary round die serving as a material of the outer member of the thread rolled round die.

FIG. 5 is a plan view of a planetary rolling machine.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 screw rolled round die (roller rolled round die) 2 outer member 2a screw portion (roller screw portion) 3 core member 4 key 10 planetary round die 10a screw portion (planetary screw portion) 11 segment die 21 screw Part removing step (part of outer member forming step) 22 Thread part reshaping step (part of outer member forming step) 23 Finishing step (part of outer member forming step) 31 Raw finishing step (core member forming step) 41 Fitting process 50 Roller type rolling machine 51, 52 Main shaft (main shaft of roller type rolling machine) 100 Planetary type rolling machine 101 Main shaft (main shaft of planetary type rolling machine) B, B0 Blank (rolled material)

Claims (6)

[Claims] 1. A roller type rolling machine, comprising: a roller type threaded portion which abuts on an outer peripheral surface of a material to be rolled, and which plastically deforms the outer peripheral surface to roll a shaft-like member having a screw or the like. In a method of manufacturing a roller type rolling round die used by being engaged with a main shaft, a planetary screw portion for rolling a screw and the like while sandwiching a material to be rolled with an arc-shaped segment die is provided on an outer peripheral surface. Using a ring-shaped planetary round die that can be engaged with the main shaft of the planetary type rolling machine as a raw material, the planetary screw portion is removed from the planetary round die, and the roller type screw portion is attached to the outer peripheral surface of the planetary round die. An outer member forming step of forming an outer member, and a core member forming step of forming a core member engageable with a main shaft of the roller type rolling machine, which is performed separately from the outer member forming step And its core member shape A method of manufacturing a roller-type rolled round die, comprising: a fitting step of fitting a core member formed by a forming step and an outer member formed by the outer member forming step to each other. 2. A roller type rolling machine, comprising: a roller type screw portion which is in contact with an outer peripheral surface of a material to be rolled, and which rolls an axial member having a screw or the like by plastically deforming the outer peripheral surface. In a roller type rolling round die that is used by being engaged with a main shaft, the roller type screw portion is formed so as to be fitted to an outer member formed on an outer peripheral surface, and an inner periphery of the outer member, A core member formed so as to be engageable with a main shaft of a rolling machine, wherein the outer member is a planetary screw portion that forms a screw or the like while holding a material to be rolled together with an arc-shaped segment die. Is composed of an annular planetary round die that can be engaged with the main shaft of a planetary rolling machine provided on the outer peripheral surface, the planetary screw is removed from the planetary round die, and the outer peripheral surface of the planetary round die is removed. For forming roller type thread A roller-type rolled round die characterized by being formed by: 3. The roller type rolling machine has two or more main shafts formed so as to be able to engage with two or more roller type rolling round dies, respectively. By sandwiching the material to be rolled between the above-mentioned roller-type rolling round dies, and rotating the two or more roller-type rolling round dies against the outer peripheral surface of the material to be rolled, 3. The roller-type rolling round die according to claim 2, wherein the outer peripheral surface of the material to be rolled is plastically deformed to roll a shaft-like member having a screw or the like. 4. The roller type rolling machine has a main shaft formed so as to be engageable with a roller type rolling round die, and the main shaft is configured to connect the roller type rolling round die to the rolled material. The outer peripheral surface of the material to be rolled is plastically deformed to form a shaft-like member having a screw or the like by rotating by contacting the outer peripheral surface of the rolled material. 2. A roller-type rolled round die according to 2. 5. The roller-type rolled round die according to claim 2, wherein the core member is detachably fitted to an inner periphery of the outer member. 6. An inner diameter of the outer member and an outer diameter of the core member are formed to be approximately 127 mm, and an inner diameter of the core member is formed to be in a range of approximately from 54 mm to 85 mm. Claims 2 to 5
The roller-type rolled round die according to any one of the above.