JP3418697B2 - Color molding method and apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for locally forming a collar on an intermediate portion of a metal shaft or a metal tube.

[0002]

2. Description of the Related Art Conventionally, when a collar is provided in the middle of a metal shaft member, a shaft member having a diameter larger than the diameter of the shaft member is used as a raw material, and is cut into a shape having a desired collar portion, or another method. The method of welding the parts to the shaft material is adopted. However, in the case of the former, it is uneconomical because not only is it time-consuming to cut, but also wasteful in terms of materials.
Moreover, it was difficult to cut out a collar in the middle part of a long product. Further, in the latter case, there is a problem that it is affected by welding heat.

In order to solve this problem, the inventor of the present invention invented a method of locally applying a rotation, compression pressure and bending to the metal shaft material as a method of locally forming a collar on the intermediate portion of the metal shaft material. , Obtained a patent (Japanese Patent No. 1
993956). According to this technique, since the collar can be easily formed in the middle portion of the metal shaft material, there is no need to perform cutting or welding as in the conventional case.

However, in the above-mentioned patent, the metal shaft is rotated while applying a constant compression pressure to bend the metal shaft to obtain a desired collar shape, and then the metal shaft is bent back to stop the pressurization and rotation. However, the conventional color forming apparatus has a complicated structure in which the respective work holding portions are configured to be rotatable and provided with the sliding mechanism and the biasing mechanism.

[0005]

Therefore, in view of the above problems, it is an object of the present invention to provide a compact device capable of forming a collar on an intermediate portion of a metal shaft or a metal tube.

[0006]

In order to solve the above problems, the present invention has the following features. That is, the linear metal shaft material or the metal pipe, which is a work, is held by a pair of holding portions facing each other at an appropriate distance D, and at least one holding portion is brought close to the other holding portion to hold the work. It reacted with adaptive compression pressure, bending to the work added by tilting at least one of the holding portion relative to the other holder axis, while applying the bending to the work
Rotate one holding unit around the axis of the other holding unit.
Rotating the work itself by rolling it
Desired to be accumulated on the entire circumference of the workpiece
After molding the collar, the work is straightened by bending back.
To form the desired collar in the middle of the workpiece.
It is characterized by doing.

Also, a pair of holding portions facing each other for holding the work are provided, and at least one holding portion approaches and separates from the other, and one holding portion is a rotatable outer cylinder.
Rotatably attached to the body and the outer cylinder by a rotating shaft
From the inner cylinder and the holding cylinder rotatably supported by the inner cylinder
In the color forming device, at least one holding unit
While providing a pressure means for approaching and separating
A rotation driving means for the outer cylinder and a bias between the outer cylinder and the inner cylinder.
It is characterized in that a means for cutting is provided.

[0008]

According to the color forming method of the present invention, first, the axes of both work holding parts are positioned on a straight line, and the linear metal shaft material or the metal tube which is the work is held at a predetermined interval D. The distance D varies depending on the material and size of the work and the desired collar size, and may be optimal according to the desired color.

Next, one holding portion is brought close to the other holding portion. That is, the compression pressure is applied to the work. This compressive pressure is of a magnitude such that the pulling force on the outside of the bending generated when the work is bent, which will be described later, is zero or counter-loaded. After that, the work is bent by the biasing means provided on one of the holding bodies. The bending angle at this time may be a minute angle of 3 to 9 degrees.

In this state, the drive means is operated to rotate one holding body about the axis of the other holding portion while keeping the one holding portion inclined with respect to the axis of the other holding portion. That is, one holding portion rotates while drawing a mortar-shaped trajectory. At this time, the work can be molded into a desired color by accumulating a small amount of convex portions generated inside the bending on the entire circumference of the work without rotating on its own axis.

When the desired color is obtained, the biasing means may be returned to the original state to straighten the work and then the pressing means may be stopped. Then, if the work is taken out, it is possible to obtain a linear metal shaft member or a metal tube provided with a desired collar.

According to this method, the apparatus can be made compact by providing a mechanism for approaching or separating from the other holding section on the side of one work holding section, and a mechanism for biasing to the other holding section and rotational driving. can do.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described more concretely while exemplifying the embodiments of the present invention shown in the drawings. The color molding apparatus 1 includes a base frame 2 placed on the floor. The base frame 2 has a pair of side plates 4 and 4 fixed in parallel in the front-rear direction on bases 3 and 3 arranged before and after being grounded on the floor. Further, front and rear end portions of the side plates 4 and 4 are respectively attached. The front horizontal frame 5 and the rear horizontal frame 6 are fixed, and the upper horizontal frame 7 is fixed so as to project from the left and right side plates 4 and 4 at approximately the center of the upper surfaces of the side plates 4 and 4. A hollow cylindrical body 8 is fixed to the rear lateral frame 6.

A sliding frame 9 is attached to the base frame 2.
Are slidable back and forth. The sliding frame 9 is provided with, on both sides of the plate member 10 arranged on the upper horizontal frame 7, substantially L-shaped restricting frames 11 and 11 in a front view, and further described below on the lower front surface of the plate member 10. The mounting member 13 of the pressurizing means 12 is fixed.

The pressing means 12 is the base frame 2
The reciprocating fluid cylinder 14 is disposed between the front horizontal frame 5 and the mounting member 13 of the sliding frame 9. In the present embodiment, the fluid cylinder is used as the pressurizing means, but any work holding part that can approach or separate from the other work holding part may be used, such as a screw type feeding device. There is no problem.

A work holding portion 15 is provided above the sliding frame 9. The work holding portion 15 is composed of two holding members 16 and 17, and each of the holding members 16 and 1
7 is provided with substantially semi-cylindrical holes 16a and 17a. When the work W is inserted into the holes 16a and 17a and the bolts 18, 18, ... Are tightened, the work is held. It is a configuration that can. In addition, this hole portion 1
The axes of 6a and 17a are arranged so as to coincide with the axis of the cylindrical body 8.

An outer cylinder 19 is rotatably supported on the cylinder 8 about its axis, and a driven gear 20 is attached to the rear end of the outer cylinder 19. The rotating shafts 21 and 21 are provided near the front end of the outer tubular body 19 and are pivotally supported by the bearing portion 23 provided near the front end of the inner tubular body 22. Further, a work holding cylinder 24, which is a work holding portion, is rotatably supported inside the inner cylindrical body 22. A male screw portion 24a is provided at the rear end of the work holding cylinder 24. A holding nut 25 provided with a female screw portion 25a is screwed onto the male screw portion 24a. The holding nut 25 has a tapered outer periphery, an external thread 25b, and a slit 25c at the rear end. The work W is held by attaching a tightening nut 26 having a taper to the male screw portion 25a.

Reference numeral 27 is a biasing means, and a member 28 provided with a female screw portion 28a is fixed to the rear portion of the outer tubular body 19 and a plate 2 provided with a hole portion 29a in the inner tubular body 22.
9, 29 are fixed. The member 28 has a male screw 3
0 is screwed onto the male screw 30, and the plate 2 is attached to the male screw 30.
The nut 31 is fixed so that the nut 31 is located between 9 and 29. That is, when the nut 31 is tightened or loosened, the distance between the member 28 and the plates 29, 29 is forcibly changed, and the other work holding portion 1 with the rotating shaft as a fulcrum.
It will be inclined with respect to the axis of 5.

Further, a motor 33 as a drive means 32 for rotating the outer cylindrical body 19 is disposed below the driven gear 20, and a drive gear 34 is attached to an output shaft of the motor 33. There is. The drive gear 34 and the driven gear 20 are meshed with each other, and when the motor 33 is operated, the outer cylinder body is rotated.

In this embodiment, the control device for the motor 33 and the fluid cylinder 14 is not shown, but the compression pressure and the rotational speed can be set arbitrarily.

When a desired collar is obtained by using the color forming apparatus 1, first, the nut 31 of the biasing means 27 is turned so that the axes of the two work holding portions 15 and 24 are located on the same straight line, and then the work holding portions 15 and 24 are rotated. The axes of the cylinder body 19 and the inner cylinder body 22 are adjusted to be the same. After that, the work W is inserted, and the bolt 18 and the tightening nut 26 are tightened to hold the work. At this time, a predetermined space D is provided between the holding portions 15 and 24. Then, the pressurizing means 12 is operated to move the sliding frame 9
Is brought closer to the other work holding unit 24. In this state, the work W is also subjected to a compression pressure that makes the pulling force zero or an anti-load also on the outside of the bending. Next, the nut 31 of the biasing means 27 is rotated to incline the axis of the work holding part 24 with respect to the axis of the other work holding part 15. This bending angle may be a slight angle of 3 to 9 degrees.

The drive means 32 is actuated in a state in which the work W is subjected to compression pressure and bending, and the state inside the bend is applied to the entire circumference of the work W. In other words, the driving means 32 rotates the outer cylinder 19 so that the inner cylinder 22 also rotates with a slight convex portion generated inside the bend. At this time, the biasing means 27 causes the axis of the outer cylinder 19 and the axis of the inner cylinder 22 to intersect with each other, and the inner cylinder 22 rotates like a mortar. Further, since the inner cylindrical body 22 and the work holding cylinder 24 are rotatably supported, the work W does not rotate, and some convex portions generated inside the bending accumulate on the entire circumference of the work W. Continue this state,
When the desired color is obtained, the rotation is stopped and the biasing means 27
Is returned to the original position and the axes of the work holding portions 15 and 24 are positioned on the same straight line, and rotation is applied. This makes the work W
Straighten. When the straightening of the work W is completed, the work W may be removed from the work holding portions 15.24.

[0023]

As described above, according to the color forming method and the apparatus thereof of the present invention, since the color forming can be performed without rotating the workpiece, at least one holding portion can be rotated.
The device can be made compact because it is not necessary to provide the device.

[Brief description of drawings]

FIG. 1 is an overall perspective view (partially sectional view) of a color molding apparatus according to the present invention.

[Figure 2] Overall side view

FIG. 3 is a side sectional view showing a processed state.

[Explanation of symbols]

1 color molding machine 2 base frame 9 Sliding frame 12 Pressurizing means 15 Work holding part 24 Work holding part 27 means of bias 32 drive means

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B21D 41/02 B21C 37/04 B21C 37/16 B21D 19/08 B21D 37/04

Claims (2)

(57) [Claims] 1. A pair of holding portions, which are opposed to each other, hold linear metal shafts or metal pipes, which are works, at appropriate intervals D, and at least one holding portion approaches the other holding portion. the reacted adaptive compression pressure to the workpiece, bending the workpiece added by tilting at least one of the holding portion relative to the other holder axis, Wa
With the other side of the holding part centered in the bent state
By rotating one holding part as a core,
The convex part that occurs inside the bend without rotating the ark itself
After accumulating all around the work to form the desired collar, bend it
By returning and straightening the work,
A color characterized by molding a desired color in the space
Molding method. 2. A pair of holding portions facing each other for holding a work, at least one holding portion approaching and separating from the other, and one holding portion is a rotatable outer cylinder body.
An inner cylinder rotatably attached to the outer cylinder by a rotating shaft.
It consists of a body and a holding cylinder that is rotatably supported by the inner cylinder.
In the color molding device, connect at least one holding part
In addition to providing pressure means for approaching and separating,
A rotation driving means for the outer cylinder and a bias between the outer cylinder and the inner cylinder.
A color molding device having a step.