CN1069852C - Roll forging shrink tube method and its device - Google Patents

Abstract

A rolling forging pipe-reducing method and its device, including the pipe-reducing method using spiral multiple balls to roll the circular blank pipe progressively, and the pipe-reducing device made by the pipe-reducing method; the spiral rolling balls are set inside one pipe reducing device comprising one upper and one lower mold with semi-conic hole wall, and the mold has several balls embedded inside and is set into the shape of hole reducing spiral pipe reducing mold cavity.

Description

Roll forging shrink tube method and its device

The invention relates to a plastic processing method and a device for a metal pipe fitting, in particular to a rolling forging shrinking pipe method and a device thereof.

The metal pipe fittings targeted by the present invention can be divided into harder iron-carbon alloy pipes (such as steel pipes) and softer non-ferrous alloy pipes (such as copper pipes, aluminum pipes and zinc pipes) in terms of material. These metal pipes are often used in general mechanical structural components or pipeline components as support pipes or conveying pipes; there are even metal pipes that are reshaped and changed as metal bars that require appropriate loads and decorative purposes Pipes, metal chair pipes, bicycle pipes or art decoration pipes... etc. It is used for tubular objects, and its application occasions are very wide. However, when making metal pipe fittings that meet the above requirements, it is often necessary to bend or shrink the pipe body to meet the use requirements. Among them, in terms of the technology of shrinking the metal tube into a tapered tube shape, the current preferred technology only uses the ROTARY SWAGER method to forge the metal tube into a tapered tube shape with a circumferential oblique body. However, the swaging method is only suitable for processing the above-mentioned relatively hard iron-carbon alloy pipes (such as steel pipes). If the soft non-ferrous alloy pipes (such as alloy pipes made of copper, aluminum, zinc, etc.) During shrinkage processing, rough orange peel burrs are easily formed on the surface of the pipe wall, which means that the pipe wall shrunk into an oblique cone shape cannot show smooth and dense quality; at the same time, the structure of the swaging equipment is more complicated, and the purchase cost is relatively high. High, not in line with economic benefits, and once the rotary forging die is in operation, the noise is extremely high, which is difficult to meet the needs of environmental protection. Therefore, in order to allow the iron-carbon alloy tubes with higher hardness and softer non-ferrous alloy tubes to be processed on the same shrinking equipment, it is necessary to make the shrinking tube wall smooth and dense. Effect, it is difficult to achieve ideal by adopting the known rotary forging extrusion (ROTARY SWAGER) method. Even using other existing molding techniques, it is difficult to easily obtain the effect of seamless, burr-free and smooth and dense shrinkage tube wall.

The purpose of the present invention is to provide a simple rolling forging shrinkage method and its device in view of the deficiencies in the prior art, especially suitable for metal round pipes made of some non-ferrous alloys. It is used when forging obliquely tapered tube walls; it can reduce the noise in the shrinking process, simplify the complexity and purchase cost of shrinking equipment, and at the same time make the shrinking tube walls smooth and dense without burrs or orange peels Wrinkles are highly industrially utilizable.

In order to achieve the above-mentioned purpose, the present invention mainly arranges a plurality of balls in the shape of the shrinking tube cavity that shrinks in the spiral direction, and makes the shrinking tube cavity produce the same rotation of rotation, and then the round blank tube is given a constant speed. Entering the cavity of the shrinking tube, the balls in the same direction as the screw feed, press and contact the wall of the blank tube in a progressive manner around the circumference, and then the wall of the blank tube can be rolled and forged into a finished shrinking tube with a required oblique taper.

The rolling forging shrinking method provided by the present invention is specifically: a rolling forging shrinking method, which is a method of rolling and shrinking the wall of the shrinking tube by using a plurality of balls to structure, including: The balls are arranged on a cycloidal path in a single helical direction, and surround a tapered circular-hole shrinking mold cavity with a gradually decreasing diameter, and then make the shrinking mold cavity rotate in the same helical direction, and make the blank tube It can mesh with the cavity of the shrinking tube at a certain feed rate, and roll and press the wall of the billet tube in a progressive manner by the gradually shrinking helical balls, so that the billet tube is shrunk into a circle that requires oblique taper. Finished shrink tubes to complete roll forging shrink tube processing.

And a rolling forging shrinking device provided by the present invention includes a plurality of balls arranged in a shrinking device, so that the rolling forging shrinking process can be easily performed by using the shrinking device; wherein the shrinking process is to be performed The billet tube is clamped by a chuck that can generate feed displacement operation; the tube shrinking device is composed of a pair of upper mold body and lower mold body, of which:

The upper and lower molds are respectively equipped with a half-fractal shrinking hole wall and an equal-diameter hole wall formed by extending the reaming end, so that the shrinking diameter and the equal-diameter hole wall can follow the path of the required helical cycloid. A plurality of buried grooves are respectively set up on the path to embed the ball seats of the balls, and the balls pivoted on each ball seat can rotate freely, so as to form a one-way spiral contraction that gradually extends from the equal diameter to the shrinking diameter. The shape of the tube cavity; by this, the shrink tube cavity can be used to produce the same rotation operation as the helical cycloid, and the meshing roll forging between the billet tube fed at a constant speed and the shrink tube cavity can be generated. The tube shrinking operation makes the wall of the billet tube shrink into the finished tube with the required oblique taper by the overlapping feed of each ball.

The present invention has the following characteristics:

1. It is only necessary to let the upper and lower mold bodies rotate automatically, and use a chuck to clamp the blank tube, so that the blank tube can mesh with the shrinking tube cavity at a predetermined speed, and carry out rolling forging shrinkage with straight feed Tube processing, the operation process is simple, fast and convenient.

2. The shrinking mold cavity with lead feed is constructed by a large number of balls in the spiral direction. The balls arranged in a circular spiral are used to evenly disperse the force of the billet tube wall during shrinkage deformation. That is to say, evenly disperse the stress and reduce the friction resistance when shrinking the tube, so that the shrinkage of the tube wall of the tube with oblique taper is extremely uniform, and the quality of the shrinking tube wall is smoother; at the same time, there is no swaging extrusion The noise from time to time is bothering, and even endangers the hearing health of the construction workers, and the production conditions are very environmentally friendly.

3. The roll forging and shrinking tube method with lead feed rate constructed by a large number of balls in the helical direction can make the circular paths of each ball and the billet tube wall roll and press each other to overlap and feed, forming a progressive overlap The shrinking processing method of the roll forging blank tube wall can improve the smooth and dense processing quality of the formed tube wall of the shrinking tube.

4. Due to the shrinkage processing method of rolling forging the billet tube wall in a spiral direction, the stress distribution of the billet tube wall will be extremely uniform when it is shrunk by force, so as to delay the hardening degree of the metal tube during processing, and thus facilitate the increase of shrinkage. Tube ratio or shrink tube feed speed to improve production quality and efficiency.

In order to describe the present invention in more detail, the method used for shrinking the tube is described in detail in conjunction with the accompanying drawings, and the preferred implementation form of the shrinking device is as follows:

A brief description of the accompanying drawings:

Fig. 1: is the three-dimensional partial sectional view of the present invention.

Fig. 2: is the cross-sectional view of the billet tube fed into the die cavity in the present invention before receiving ball pressing and contraction.

Fig. 3: is the sectional view of the present invention along the line A-A' of Fig. 2.

Fig. 4 is a cross-sectional view of the present invention when the blank tube in the mold cavity is pressed and shrunk by balls arranged in a reduced diameter.

Fig. 5: is the sectional view of the present invention along the B-B' line of Fig. 4.

Fig. 6: is the sectional view of the blank tube in the present invention when it is shrunk into a shrink tube finished product in the mold cavity.

Explanation of reference numbers:

Upper mold body 1 Lower mold body 2 Reduced diameter hole wall 11,21

Equal-diameter hole wall 12, 22 buried groove 13, 23 ball 3

Bead seat 31 Shrink tube cavity 32 Blank tube 4

Blank tube wall 41 Shrink tube 5 Shrink tube wall 51

Chuck 6

The roll forging tube shrinking method and its device provided by the present invention include a tube shrinking method that uses a plurality of balls 3 in the spiral direction to carry out progressive roll rolling on a circular blank tube 4, and in order to implement the tube shrinking easily Tube shrinking device made by tube method.

The rolling forging shrinkage tube method must utilize a plurality of balls 3 that can freely rotate in situ, arrange them on a cycloidal path in a single helical direction, and make the balls 3 on the cycloidal path surround into a gradually reduced diameter. The oblique cone-shaped round hole type shrinking tube cavity 32, and then make the shrinking tube cavity 32 rotate in the same direction of rotation, and then mesh the blank tube 4 with the shrinking tube cavity 32 at a certain speed, and gradually reduce the diameter Most of the balls 3 in the spiral direction roll and press the blank tube wall 41 in a progressive manner around the circumference, so that the blank tube wall 41 is shrunk into a circular shrink tube 5 finished product with a required oblique taper, so as to complete the process of rolling forging shrink tube method (refer to Figure 1 to Figure 6).

The above-mentioned rolling forging shrinking method can be easily implemented, and the ball 3 can be constructed in a shrinking device to complete it. As shown in Figure 1, the shrinking device is mainly composed of a pair of upper mold body 1 and The lower mold body is composed of 2;

Wherein, the upper mold body 1 and the lower mold body 2 are respectively formed with half-fractal reduced-diameter cavity walls 11 and 21, and the enlarged hole ends of the reduced-diameter cavity walls 11 and 21 are extended and formed with equal-diameter cavity walls 12 and 22. , and make the reduced diameter and equal diameter hole walls 12 and 22, according to the path of the required helical cycloid, and set up a plurality of buried grooves 13 and 23 on the path respectively, to embed the ball seat 31 of the ball 3, And the balls 3 pivoted on each ball seat 31 can rotate freely, so as to form the shape of the one-way spiral shrinkage tube mold cavity 32 with equal diameter gradually extending to a reduced diameter;

When the tube shrinking device is used to roll forge the metal circular blank tube 4, before the blank tube 4 meshes with the shrink tube cavity 32, the chuck 6 that can generate the feed displacement operation can be used. To clamp the blank tube 4, and the outer mold walls of the upper and lower mold bodies 1 and 2 with the shrinking tube cavity 32 inside can be clamped on a device that can generate rotation movement, so that the blank tube 4 can shrink During pipe processing, it can be fed into the shrinking tube cavity 32 in the state of rotation at a required constant speed, and the processing of the shrinking tube can be carried out by rolling forging; during this time, the turning of the shrinking tube cavity 32 to produce rotation must be in line with the cycloidal path. The helical direction of feeding between each ball 3 is the same;

When the blank tube 4 is meshed with the shrinking tube mold cavity 32, the feeding power generated by it can come from the chuck 6 or the peripheral transmission equipment of the upper and lower mold bodies 1 and 2, so that the blank tube 4 and the shrinking tube The feeding meshing operation at a certain rate can be generated between the pipe mold cavities 32;

When the base tube 4 is fed between the balls 3 on the equal-diameter cavity walls 12 and 22, the balls 3 can be temporarily used to guide the precision before shrinking the tube (as shown in Figures 2 and 3), or Utilize the balls 3 on the equal-diameter mold cavity to evenly forge the pipe wall 41 of the plastic billet, so that the billet pipe wall 41 is rolled into a straight pipe shape of equal diameter;

When the billet tube 4 that has been guided and stably fed forward, one side end will first go against the ball 3 that first shrinks in diameter (as shown in Figures 4 and 5), and the surrounding billet tube wall 41 will be pushed forward. Along with the feeding of the blank tube 4, the spherical surface of the gradually shrinking ball 3 is accepted gradually around the circumference, thereby forming the finished form of the shrink tube 5 as shown in FIG. 6 .

Meanwhile, when the blank tube 4 accepts the shrinkage mold cavity 32 formed by the spiral ball 3, it will produce a material extruding effect, so that after the shrinkage is completed, the wall surface at the end of the shrinkage wall 51 will be thicker (such as As shown in FIG. 6 ), it is relatively convenient to use, and the end of the shrink tube wall 51 can have stronger energy absorption efficiency and energy transmission efficiency.

And because the point of application of force on the shrinking tube cavity 32 that presses against the blank tube wall 41 all occurs on each ball 3, the material of each ball 3 must be harder than the blank tube 4, so when the pressure touches the tube wall 41, it has a higher hardness. Iron-carbon alloy pipes or non-ferrous alloy pipes with softer hardness can maintain a higher strength of the bead surface mold cavity.

Using this pipe shrinking method, in addition to shrinking obliquely tapered pipe fittings, it is also possible to shrink and make integrated reduced-diameter straight pipes by changing the arrangement of the spiral hole wall, which has a wide range of applications; even when shrinking, According to the demand of production capacity, multiple tube shrinking devices and chucks can be installed on the same machine, and the extrusion and shrinking processing of multiple blank tubes can be performed simultaneously, thereby greatly reducing production costs and improving competitive efficiency.

Simultaneously, when the present invention is implemented, the helical cycloid path used for arranging a large number of balls can weave several adjacent helical cycloids into one group, so that the balls on each group of helical cycloid paths together generate The helical weaving operation with a large feed rate, in this way, will help the billet tube to rotate and feed into the mold cavity, and use multiple balls in each group on the path close to the cycloid to overlap the feed rolling billet tube , so that the wall of the oblique tapered tube after being rolled and formed has a smooth and dense shrinking effect, and at the same time, it also speeds up the feeding speed of the tube when shrinking the tube, and improves its processing speed.

In summary, the rolling forging shrinking method and its device provided by the present invention can indeed provide a relatively simple shrinking processing method for a wide range of soft and hard metal pipe fittings, and use the spiral lead The spherical surface of the ball on the path is used as a technical means for the uniform shrinkage of the tube wall of the progressive rolling billet, and it has not been cited in the market. Therefore, the method for shrinking the tube by rolling forging disclosed in the present invention is simple and easy to implement. The shrinking devices used in this method should all belong to highly technical creations.

Accordingly, any use of a plurality of balls and arranging them into a shrinking tube cavity in the form of spirally reduced-diameter bead surfaces, so that the cavity can be used to process the wall of the shrinking tube by rolling forging, should belong to the technology of the present invention The scope is specially explained.

Claims (2)

1. A rolling forging shrinking method, which is characterized in that: it is a method for rolling and shrinking the wall of the shrinking tube by using a plurality of balls, including: arranging a plurality of balls that can rotate freely in situ in a single helical direction On the cycloidal path, it surrounds the oblique cone-shaped circular hole shrinking cavity with gradually reduced diameter, and then makes the shrinking cavity produce the same spiral direction of rotation, and enables the blank tube to be fed at a certain feed rate and The cavities of the shrinking tubes are meshed with each other, and the spiral balls gradually shrink in diameter to roll and press the wall of the blank tube in a circumferential and progressive manner, so that the blank tube is shrunk into a circular shrinking tube product that requires an oblique taper to complete the rolling process. Forged tube processing. 2. A rolling forging shrinking device, characterized in that it includes a plurality of balls arranged in a shrinking device, so that the rolling forging and shrinking processing can be easily performed by using the shrinking device; The blank tube is clamped by a chuck that can generate feed displacement operation; the tube shrinking device is composed of a pair of upper mold body and lower mold body, of which: The upper and lower molds are respectively equipped with a half-fractal shrinking hole wall and an equal-diameter hole wall formed by extending the reaming end, so that the shrinking diameter and the equal-diameter hole wall can follow the path of the required helical cycloid. A plurality of buried grooves are respectively set up on the path to embed the ball seats of the balls, and the balls pivoted on each ball seat can rotate freely, so as to form a one-way spiral contraction that gradually extends from the equal diameter to the shrinking diameter. Tube cavity shape.

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