JPH1034269A - Thread rolling device of l shaped stock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate deviation between axes of a stock and screw and to make the device applicable to a stock having thin thickness and as cast inner diameter by arranging a receiving table with cushion placing a L shaped stock to the axis part of lower part of die and arranging a support plate to support bias load of a swing end part of L shaped stock to the upper part of die. SOLUTION: An outer frame 15 is fixed to a frame 21, a support plate 14 for a L shaped stock is mounted in the inner peripheral direction of outer frame 15, upward thrust is given to the support plate 14 by a spring 22, a finish limit end 23 of support plate 14 is arranged to the outer frame 15, the support plate 14 is held to the outer frame 15 vertically oscillatable. Further, by arranging the outer frame 15 as well as the support plate 14 rotatable, sliding friction with a stock 12 is eliminated and the stock 12 is surely supported. By placing the L shaped stock 12 on the receiving table 18 with cushion, a swing end contact part 13 of the stock 12 is brought into contact with the support plate 14, deviation of axes due to the bias load of stock 12 is eliminated by the reaction force of spring 22 the screw, which axes of stock and thread rolling screw is aligned, is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling device for rolling a screw on an outer surface of a hollow material mainly having an L-shape such as a mechanical part or a pipe joint.

[0002]

2. Description of the Related Art Generally, thread rolling is generally performed on solid materials such as bolts, and thread rolling of hollow materials is performed on thick materials which are upright like nipples. . However, when rolling a hollow L-shaped material,
Since it is bent into a shape, it has an eccentric load, and when it is rolled into a thin material, there is a problem that the axis of the L-shaped material and the axis of the screw are shifted, and the material is reduced in diameter. For this reason, as shown in FIG.
Is vertically supported, and a die 5 is pressed against the material 1 to form a roll. This device has a material inner diameter of 38 and a mandrel 4
Arrow 37 due to the unbalanced load of the material 1 with the fitting gap of 0 being small.
This is a thread rolling device that reduces inclination in the direction and eliminates deviation of the axis.

[0003]

When a material having an eccentric load such as an L-shaped material is rolled without supporting the material, the axis of the material and the axis of the screw are shifted. If the axis is shifted, a problem that the tube cannot be screwed straight or a problem that the nut does not fit occurs, and the function of the threaded part is impaired. Therefore, it is a minimum necessary condition that the axis of the material and the axis of the screw do not shift. In the device shown in FIG. 7 of the prior art, the fitting gap between the cushioned mandrel 40 and the material inner diameter 38 affects the influence of the unbalanced load. The L-shaped material 1 is hollow,
If the diameter of the material is reduced at the time of thread rolling by press-fitting the rolling dies 5, it is difficult to maintain an effective gap because the outer diameter of the mandrel 40 is compressed. For this reason, it is difficult when the thickness of the material is small, and the material inner diameter 38 cannot be centered on the mandrel unless it is fitted on the machined surface, and cannot be applied to the inner surface in the as-cast state.

FIGS. 5 and 6 show a conventional thread rolling device which receives an eccentric load of an L-shaped material in the vicinity of a shaft end 2 orthogonal to a rolling shaft center. 5 and 6, the end 2 of the material is brought into contact with the end receiving plate 7 while holding the rolling-side axis of the material 1 in parallel with the axis of the rolling die 5, and the receiving plate 7 is fixed. In addition, the inclination of the material 1 in the direction of arrow 3 due to the unbalanced load is reduced, and the displacement of the axis is eliminated. However, during rolling, a phenomenon occurs in which the material 1 rotates and moves in the axial direction while the die 5 contacts the material 1 until the die 5 separates from the material 1. This phenomenon is called a rolling step, and when walking in the suction direction arrow 4, the end receiving plate 7 forcibly pushes up the material contact portion 2 to the receiving plate 7 in the direction opposite to the eccentric load 3 direction, and the correct screw is screwed. It was difficult to roll. The present invention solves the above problems, and eliminates the deviation between the axis of the material and the axis of the screw,
An object of the present invention is to provide a rolling device in which a material is thin and can be applied to a material having an as-cast inner diameter.

[0005]

SUMMARY OF THE INVENTION The gist of the present invention is that a plurality of rolling dies are provided around an axis, which roll in a horizontal direction with respect to an axis in a vertical direction, and an L-shaped material is provided at the axis at the lower part of the die. Characterized in that a supporting table with a cushion on which a pedestal is placed is provided, and a support plate for supporting an eccentric load at the swinging end of the L-shaped material is elastically provided above the die to support the L-shaped material. It is. In the above, the support plate can be rotatably provided. Further, a holding portion for elastically pressing the upper portion of the axis of the L-shaped material can be provided on the upper portion of the die.

[0006]

According to the present invention, there is provided a support plate for supporting an end of the L-shaped material orthogonal to the rolling axis, and the support plate is elastically supported. The material is placed on a cushioned pedestal, and the elastic upward thrust of the support plate supports the eccentric load on the swing end of the L-shaped material. During the initial stage of pressurization when the rolling die starts to contact the L-shaped material, the unbalanced load of the L-shaped material is held in alignment with the axis because it is elastically supported by the support plate. Next, the above-described rolling step occurs in the process of press-fitting the rolling die. The rolling step in the extrusion direction is such that the contact portion of the L-shaped material is separated from the support plate, and the rolling step in the suction direction is L.
The contact portion of the shaped material with the support plate pushes the support plate, overcoming the elastic thrust of the support plate and pushing down the support plate by a required amount. Thus, a correct screw can be rolled in accordance with the rolling steps in the extrusion direction and the suction direction. In addition, the support plate can be rotatably provided to eliminate friction between the L-shaped material and the support plate, and a holding portion for holding the L-shaped material can be provided above the L-shaped material to support the L-shaped material. It is possible to provide a thread rolling device that does not cause a shift in the axis.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2 showing the first embodiment of the present invention, when the drive shaft 20 rotates,
The die 16 is rotated via the universal joint 19. When the die holder 17 is pressurized by a hydraulic cylinder, a cam mechanism, or the like, the die holder 17 advances to the center in the horizontal direction together with the dice. A cushioned pedestal 18 is provided between the dies 16. When the material 12 is inserted, the lower end of the material is placed on the cushioned pedestal 18. When the L-shaped material 12 is placed on the receiving table 18 and the die holder 17 is brought close to the material 12, the dies 16 are pressed into the material 12 and rolling is performed.

An outer frame 15 is fixed to a frame 21. A support plate 14 made of an L-shaped material is mounted in the inner peripheral direction of the outer frame 15, and an upward thrust is applied to the support plate 14 by a spring 22. The push-up restricting end 23 of 14 is provided on the outer frame 15, and the support plate 14 is held on the outer frame 15 so as to be able to swing up and down. In addition, the outer frame 15 or the support plate 14 is rotatably provided,
Sliding friction with the material can be eliminated, and the material 12 can be reliably supported. When the L-shaped material 12 is placed on the cushioned pedestal 18, the swinging end contact portion 13 of the material 12 comes into contact with the support plate 14, and the support plate 14 is caused by the repulsive force of the spring 22 to shift the shaft center due to the unbalanced load of the material 12. lose. The spring force of the spring 22 is sufficient and minimized to support the unbalanced load of the material. In the present embodiment, the pushing force of the spring is set to 400 g. When rolling starts in a state where the deviation of the axis is eliminated, the rolling process starts.
When the rolling step in the suction direction occurs, the L-shaped material 12 can be rolled by the support plate 14 without pushing up the L-shaped material 12 in a direction opposite to the eccentric load, so that correct screw rolling can be performed.

FIGS. 3 and 4 show a second embodiment of the present invention.
Above the axis of the L-shaped material 12, there is provided a rotation holding part 26 for elastically pushing down and holding the material 12. This holding part 2
6 is provided with a ring holder 30 conforming to the outer shape of the material rotatably by a bearing 34, and a spring 36 at the upper end.
Is provided and the material 2 is held while being held down. When the rolling step in the extrusion direction occurs in the material 12, the holding unit 26 also follows the material and presses the material 12. This makes the material 12
From the point of setting until the end of the rolling, it works so as to eliminate the deviation of the axis of the material, and performs the correct thread rolling.

[0010]

As described above, the rolling device of the present invention can set the deviation of the axis of the L-shaped material, the deviation due to the uneven load when the die is pressed into the L-shaped material can be eliminated, and the axis of the L-shaped material can be set. It is possible to form a correct screw that matches the axis of the rolled screw. In addition, since the support plate receives an uneven load of the material with an elastic member,
The correct thread rolling can be performed according to the rolling process. Further L
By holding the upper part of the L-shaped material, it can be set without any deviation between the axis of the L-shaped material and the axis of the screw. Correct thread rolling to L-shaped material can be performed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a main part of FIG. 1;

FIG. 3 is a diagram showing a second embodiment of the present invention.

FIG. 4 is a diagram showing a main part of FIG. 3;

FIG. 5 is a diagram illustrating a conventional rolling device.

FIG. 6 is a diagram showing a main part of FIG. 5;

FIG. 7 is a view showing a conventional rolling device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 L-shaped material 13 End contact part of material 14 Support plate 15 Outer frame 16 Dice 17 Dice holder 18 Cradle 19 Universal joint 20 Drive shaft 21 Frame 22 Spring 26 Rotation holding part 30 Ring holder 34 Bearing 36 Spring

Claims (3)

[Claims] 1. A plurality of rolling dies which advance and retreat in a horizontal direction with respect to an axis in a vertical direction are provided around an axis, and a cushioned pedestal for mounting an L-shaped material on an axis at a lower portion of the die is provided. A support plate for elastically providing a support plate for supporting an unbalanced load at the swinging end of the L-shaped material on the upper part of the die and supporting the L-shaped material.
A thread rolling device for shaped materials. 2. The apparatus according to claim 1, wherein the support plate is rotatably provided. 3. The L-shaped thread rolling device according to claim 1, wherein a holding portion for elastically pressing an upper portion of an axis of the L-shaped material is provided on the upper portion of the die.