JPH09327728A - Main mandrel mounting device for tube bending device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a cutting process of a tube after bending by bending a tube with a right length. SOLUTION: In the device, in which a main mandrel 60 is arranged through a mounting holder 50 with arranging a bending die 20 and pressing means 30 to a frame 10, a clamp means 40 is arranged in the bending die, the main mandrel is inserted into a tube stock P as well as a clamp mandrel 70 is inserted into a tip mouth of the tube stock, the tube stock is held to the bending die by the clamp means and pressed to the bending die by a pressing means, the tube stock is bent while rotating the bending die, the main mandrel which is pivotally attached with a ball mandrel 64 and is interposed with a compression elastic means 62, can press the ball mandrel against the mounting holder as opposing to elasticity of compression elastic means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a main core mounting device for a pipe bending device, and more particularly to a pipe bending device in which a ball mandrel is pivotally attached to a tip end surface of the main core.

[0002]

2. Description of the Related Art A conventional pipe bending apparatus M of this type
As shown in FIG. 3 and FIG.
And the clamp mandrel 70 is inserted from the front end opening of the pipe material P, and the portion 90 of the pipe material P corresponding to the accommodating space of the ball mandrel 64 and the accommodating space of the clamp mandrel 70 is bent by the clamping means 40. The pipe material P is bent by sandwiching it in the die 20 and pressing the pipe material P against the bending die 20 by the pressing means 30, and rotating the bending die 20 together with the clamping means 40 in this state.

[0003]

However, when the portion 90 of the pipe material P corresponding to the accommodation space of the ball mandrel 64 and the accommodation space of the clamp mandrel 70 is clamped by the clamp means 40 in this way, the pipe Material P
This clamp part 90 in becomes extremely long, and as a result, this clamp part 90 in the pipe material P must be cut to an appropriate length as a post-process after bending the pipe material P. There is an inconvenience that the bending process is troublesome and the yield of the bending process of the pipe material P is bad, and it cannot be avoided.

In particular, since post-processing for cutting the pipe material P requires operations such as deburring, cleaning, and diameter correction, the length of the clamp portion 90 in the pipe material P means that the pipe material P has a long length. It has a disadvantage that it is very difficult to improve the work efficiency of the bending work.

An object of the present invention is to eliminate such inconvenience.

[0006]

In order to achieve the above-mentioned object, in a main core mounting device for a pipe bending apparatus according to the present invention, a bending die and a pressing means are provided on a frame, and a main center is provided via a mounting holder. Gold is provided, clamp means is installed on the bending die, the main mandrel is inserted into the pipe material, and the clamp mandrel is inserted into the tip end port of the pipe material. The pipe material is clamped by the clamping means and pressed to the bending die by the pressing means, and,
In a pipe bending apparatus that bends the pipe material while rotating the bending die together with the clamping means, the main mandrel has a ball mandrel pivotally attached to a tip end surface thereof, and a space between the main mandrel and the mounting holder. Since a compression elastic means is interposed in the above, the ball mandrel can be pushed into the mounting holder against the elasticity of the compression elastic means.

As shown in FIG. 1, when the clamp mandrel is inserted into the tip end of the pipe material, the ball mandrel, and thus the main mandrel, is pushed toward the mounting holder against the elasticity of the compression elastic means. As a result, most of the space for accommodating the ball mandrel in the pipe material can be arranged on the inner side (mounting holder side) of the bending start point of the pipe material, so that the clamp portion of the pipe material can be short. .

[0008]

1 and 2, M is a pipe bending apparatus and 10 is its frame. Reference numeral 20 denotes a bending die, which is rotatably installed on the frame 10. This bending mold 20
It is bent by winding the pipe material P described later on the peripheral surface. Reference numeral 30 denotes a pressing die (corresponding to “pressing means” of the present invention), which is the bending die in the frame 10.
It is installed near 20. Further, 40 is a clamp means, which is installed on the bending die 20. The functions of the pressing die 30 and the clamp means 40 will be described later.

Next, 50 is a mounting holder, which is installed on the frame 10. Reference numeral 51 is a fitting hole, which is formed in the mounting holder 50. Reference numeral 52 denotes a through hole, which is formed at the bottom of the fitting insertion hole 51 with the same axis.

Reference numeral 60 denotes a main core, and the root of the main core is fitted into the fitting hole 51 of the mounting holder 50 so as to be able to move back and forth. The main bar 60 is inserted into the pipe material P. Also,
Reference numeral 61 is a guide bolt, which is provided so as to project from the rear end surface of the main metal core 60. The guide bolt 61 penetrates the through hole 52 of the mounting holder 50 so as to be able to move forward and backward. Reference numerals 611, 611 are a pair of nuts, which are screwed into the tip end portion of the guide bolt 61. These nuts 611, 611 form a so-called double nut structure to prevent the guide bolt 61 from coming off.

Reference numeral 62 denotes a compression spring (corresponding to the "compression elastic means" of the present invention), and the fitting insertion hole 51 of the mounting holder 50.
Is disposed between the bottom surface of the core and the main core metal 60. Therefore, the main mandrel 60 can be pushed into the fitting insertion hole 51 against the compression spring 62. Note that FIG. 1 shows a state in which the main core 60 is pushed into the fitting insertion hole 51.

Next, 63 is a cylinder part,
It is formed on the front of 60. Further, 64 is a ball mandrel, which is pivotally attached to the open end of the cylinder portion 63 via a connecting pin 641. The pipe material P is pulled out according to the ball core 64. Reference numeral 65 denotes a plunger, which is inserted into the cylinder portion 63 of the main core 60 so as to be able to move forward and backward. Further, 631 is a positioning compression spring, which is arranged between the bottom surface of the cylinder portion (of the main mandrel 60) 63 and the plunger 63. Therefore, the upper surface of the plunger 63 is in pressure contact with the rear end of the ball mandrel 64.

Reference numeral 70 designates a clamp mandrel, which is the pipe material P.
Has been inserted into the tip opening. The clamp mandrel 70 is for preventing the pipe material P from being deformed when the pipe material P is clamped by the clamping means 40 in the bending die 20.

Next, the operation of the pipe bending apparatus M will be described with reference to FIGS. 1 and 2.

First, as shown in FIG. 1, the main core 60 is inserted into the pipe material P. Then, the main mandrel 60 is brought into contact with the bending die 20 in a state where the vip material P is inserted. Then press die 30
Is operated to press the pipe material P against the bending die 20. After that, the clamp mandrel 70 is inserted from the front end opening of the pipe material P, and the ball mandrel 64 is pushed against the elasticity of the compression spring 62. In this state (state of FIG. 1), the clamp cored bar 70 is fixed to the pipe material P. Then, the clamp means 80 clamps the clamp portion 80 of the pipe material P, and as shown in FIG.
The pipe material P is bent by rotating the bending die 20 in the clockwise direction. At this time, as the pipe material P extends, the compression spring 62 returns and the main mandrel 60 and thus the ball mandrel 64.
Moves forward following the clamp mandrel 80 and stops when the bending die 20 rotates by a target angle (see the state of FIG. 2). Then, the clamp means 40 and the pressing die 30 are released, and the pipe material P is pulled out from the main core metal 60.

[0015]

In the pipe core bending apparatus mounting device according to the present invention, the frame is provided with the bending die and the pressing means, the main core is provided through the mounting holder, and the bending die is provided with the clamping means. And insert the main mandrel into the pipe material and insert the clamp mandrel into the end opening of the pipe material. In this state, the pipe material is clamped by the clamping means and pressed by the bending die. In the pipe bending apparatus for pressing the pipe material against the bending die by means, and bending the pipe material while rotating the bending die together with the clamping means, the main mandrel pivots a ball mandrel on a tip surface. A compression elastic means is interposed between the main mandrel and the mounting holder while the ball mandrel is attached to the mounting holder. For that to be able to push against the elasticity of the stage,

As shown in FIG. 1, when the clamp mandrel is inserted into the tip end of the pipe material, the ball mandrel, and thus the main mandrel, is pushed toward the mounting holder against the elasticity of the compression elastic means. As a result, most of the space for accommodating the ball mandrel in the pipe material can be arranged on the inner side (mounting holder side) of the bending start point of the pipe material, so that the clamp portion of the pipe material can be short. .

Therefore, if the mandrel attaching device for a pipe bending device according to the present invention is used, the pipe material can be bent in an appropriate length state, which is conventionally required.
As a result of eliminating the step of cutting the pipe material after the bending work, the bending work efficiency of the pipe material is improved and the yield in the bending work of the pipe material is improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main core mounting device for a pipe bending device according to the present invention when viewed in plan (state in which a pipe member is mounted).

FIG. 2 is a cross-sectional view of the main core attaching device for a pipe bending device in plan view (a pipe material is bent).

FIG. 3 is a diagram of a conventional example corresponding to FIG. 1;

FIG. 4 is a diagram of a conventional example corresponding to FIG. 2;

[Explanation of symbols]

 10 ... Frame 20 ... Bending die 30 ... Pressing die (pressing means) 50 ... Mounting holder 60 ... Main core 40 ... Clamping means P ... Pipe material 70 ... Clamping core 64 ... Ball core 62 ... Compression spring (compression elastic means) ) M ... Pipe bending device

Claims (1)

[Claims] 1. A frame is provided with a bending die and a pressing means, a main core is provided through a mounting holder, and a clamping means is provided on the bending die, and the main core is inserted into a pipe material. A clamp mandrel is inserted into the front end port of the pipe material, and in this state, the pipe material is clamped by the clamp means and the pipe material is pressed by the pressing means to the bend mold, and In a pipe bending apparatus that bends the pipe material while rotating the bending die together with the clamp means, the main core has a ball core on its tip surface and the space between the main core and the mounting holder. Is compression elastic means, and the ball mandrel with respect to the mounting holder,
The main core mounting device for a pipe bending device, which can be pushed against the elasticity of the compression elastic means.