JPH0510977Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a holding mechanism for a pressure die in a bending machine for pipes and shaped steel.

B. Conventional technology In FIG. 2, the conventional pipe bending direction will be explained.

Fig. 2a shows the state before the pipe is bent, and Fig. 2b shows the state during the pipe bending. The tube 14 as the workpiece is rotated around the central axis of the bending die 10 while being held by the bending die 10 and the clamp die 11 to form a bend. At this time, the pressure valve 12 slides in synchronization with the workpiece to prevent the workpiece from deforming when bending occurs. 3 and 4 show a conventional method of holding a pressure mold. FIG. 3 shows a holding and sliding method using metal contact, and FIG. 4 shows a holding and sliding method using rollers.

C. Problems to be solved by the invention As shown in Figures 3 and 4, conventional pressure molds 12
When mounting on the fixed table 13, since the mounting dimensions of 13a or 13b on the table side are constant, the dimensions on the pressure mold side are also constant in accordance with the dimensions on the table side.

However, since the size (pipe diameter) of the workpiece varies, the dimensions of the pressure mold 12 need to be changed accordingly, but the shape and dimensions of the attachment part are the same regardless of the size of the mold. Must be sized. Therefore, 1. For pressure molds with small pipe diameters, the small mold shown by the imaginary line in Figure 5b should be sufficient, but in order to match the shape and dimensions of the attachment part, the mold shown by the solid line in Figure 5b is used. It is said that That is, a mold with a large pipe diameter, which is almost the same as the large mold shown in FIG. 5a, is required.

2. Therefore, the weight of the mold becomes large and handling is not easy.

This causes problems such as:

D. Means for solving the problem: The interval between the pressure mold support grooves can be changed steplessly and continuously, and even when the width of the mold changes, the width of the mold can be changed on the guide block side that slides the mold. Made it possible to correspond to. For this purpose, a left-hand thread and a right-hand thread are formed on the same shaft, and guide blocks 2a and 2 are respectively formed.
b are screwed together and the screw shaft is rotated to move the left and right guide blocks toward and away from each other according to the direction of rotation, creating a mechanism that can accommodate the width of the mold.

E. Function The function of the present invention will be explained with reference to Fig. 1b.

The pressure mold 1 is guided by rollers 5 and 4, but since the width of the pressure mold 1 changes depending on the size of the pipe to be processed, the pressure mold 1 is guided by the rollers 4a and 4b in order to bend pipes of various sizes. I have to change the spacing. The shaft 3 has a right-hand thread 3a and a left-hand thread 3b, into which the guide blocks 2a and 2b are screwed, respectively, so when the shaft 3 is turned according to the width of the pressure mold 1, the guide block 2a , 2b becomes the width of the pressure mold.

Embodiment FIG. 1 shows an embodiment of a pipe bender according to the present invention.

Figure 1a is an external view of the pipe bender, with cross section A-
In part A, there is a variable mold holding device of the present invention.
Its enlarged view is shown in 1b.

A shaft 3 having a right-handed thread 3a and a left-handed thread 3b is supported by bearing fittings 7 and 8 on both sides of a channel steel 6. The left and right screws of the shaft 3 are protruding guides 8a and 8b.
A guide block having rollers 4a and 4b is screwed together, and the protruding guides 8a and 8b are connected to the pressure mold 1.
It fits into the guide groove of. In addition, there are a plurality of rollers 5, 5 in the longitudinal direction of the groove, and the pressure fitting 1 slides in the direction of the groove guided by these rollers and the protruding guide.

G. Effects of the invention By implementing the invention, we were able to obtain the following remarkable effects.

1 Material costs and processing costs for molds have been significantly reduced.

2 Workability and safety have been significantly improved due to the weight reduction of the mold.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the embodiment of the present invention, Figure 2 is a diagram of the tube bending process, Figure 2a is the state before bending, Figure 2b
The figure shows the state during pipe bending, Figure 3 shows the holding and sliding method using metal contact, Figure 4 shows the holding and sliding method using rollers, and Figure 5a shows the mold for large pipe diameters. , FIG. 5b shows a mold for a small diameter pipe superimposed on a mold for a large pipe diameter by imaginary lines. Explanation of symbols: 1, 12...pressure mold, 2a...
Right guide block, 2b...Left guide block,
3...Screw shaft, 3a...Right-hand thread, 3b...Left-hand thread, 4a, 4b, 5...Guide roller, 6...Slot type steel, 7, 8...Bearing fitting, 8a, 8b...Protruding guide , 10...Bending mold, 11...Clamping mold, 13a, 13b...Fixed table, 14...
tube.

Claims (1)

[Scope of utility model registration request] A pipe bender that has a pressure mold that is held on a fixed table and can freely slide along the pipe to be bent, and that bends the pipe while supporting the pipe with the pressure mold. The means for clamping the opposing sides is provided separately for each clamping part, and the clamping parts are slidable so as to be able to approach and separate from each other, and means for moving the respective clamping parts toward and away from each other are provided. Features a variable mold holding device for pipe benders.