CN2762912Y

CN2762912Y - Die sued for bending thin-wall tube variable curvature

Info

Publication number: CN2762912Y
Application number: CN 200420103435
Authority: CN
Inventors: 肖小亭; 廖毅娟
Original assignee: Guangdong University of Technology
Current assignee: Guangdong University of Technology
Priority date: 2004-12-31
Filing date: 2004-12-31
Publication date: 2006-03-08
Anticipated expiration: 2014-12-31

Abstract

The utility model relates to a die used for bending the variable curvature of a thin-wall tube. The utility model comprises a bend pushing plunger tip (1), a bending die (4), a lower moulding plate (5), a plunger tip fixed plate (8) and an upper moulding plate (9), wherein the bend pushing plunger tip (1) is arranged on the plunger tip fixed plate (8), and the plunger tip fixed plate (8) is connected with the upper moulding plate (9) through a connecting piece (10); the bending die (4) is arranged at the lower side of the bend pushing plunger tip (1), and arranged on the lower moulding plate (5), wherein a groove of changing curvature (41) is arranged in the bending die (4), and a tube blank (2) is placed at the straight part in the groove of changing curvature (41) of the bending die (4). Because the utility model adopts the groove of changing curvature to replace a conventional groove with constant curvature, the utility model makes large centralization deformation disperse in different stages to be completed in the process of work; in one bend pushing process, compared with a constant curvature bend, larger deformation can be obtained and a larger bending angle and a smaller bending radius can be obtained. The utility model has the advantages that the structure is simple, convenient and applied, the bending deformation degree of pipes can be enhanced and the production efficiency of a bending pipe can be improved.

Description

The thin-wall tube curvature-variable push-bending process mould therefor

1, technical field:

The utility model is a kind of thin-wall tube curvature-variable push-bending process mould therefor, belongs to the innovative technology of light-wall pipe push-bending process mould therefor.

2, background technology:

Crooked pipe part is widely used in industries such as petrochemical industry, building construction, automobile, aviation.This is not only because crooked pipe part has the pipe-line system of change logistics direction function, also since the hollow bent pipe part to possess area of section little, the feature that the bending resistant section coefficient is big, the ability of when bearing external applied load, can improve bending resistance, turning round.Rationally use hollow crooked part not only can guarantee the quality of machinery equipment, can also save material, weight reduction reduces cost.Traditional light-wall pipe bending process, mainly contain go for a stroll, roll curved, bend and push away methods such as curved.No matter but be which kind of method, when carrying out bending, when flector that pipe passes through or mould, its bending radius is constant, promptly permanent curvature bending.Because the Transformation of Bendt Pipe degree is relevant with relative bending radius and relative thickness, different materials all has certain restriction with different bending methods to bending radius and angle of bend etc., therefore, if obtain bigger deformation extent, must adopting repeatedly, the bending machining mode just can reach.Used the bend pipe part that hydroforming can obtain minor radius in recent years, but hydroforming needs special equipment and hydraulic system, production efficiency is lower, is subjected to certain restriction so apply.

3, summary of the invention:

The purpose of this utility model is to overcome above-mentioned shortcoming and a kind of simple in structure, convenient and practical used mould of thin-wall tube curvature-variable push-bending process is provided.The utility model both can improve the Transformation of Bendt Pipe degree, can improve the production efficiency of bend pipe again, can significantly reduce production costs, and improved the quality of products, and created remarkable economic efficiency.

The structural representation of the mould that the utility model thin-wall tube curvature-variable push-bending process is used as shown in drawings, include and push away curved drift (1), bending die (4), lower bolster (5), drift fixed head (8), cope match-plate pattern (9), pushing away curved drift (1) is installed on the drift fixed head (8), drift fixed head (8) is connected with cope match-plate pattern (9) by connector (10), bending die (4) places the below that pushes away curved drift (1), and be installed on the lower bolster (5), wherein be provided with variable curvature type groove (41) in the bending die (4), pipe (2) is placed on the straight line portion in the variable curvature type groove (41) of bending die (4).

Above-mentioned lower bolster (5) is provided with two guide pillars (6), cope match-plate pattern (9) with the corresponding position of guide pillar (6) on be provided with two guide pin bushings (7) that can slide along guide pillar (6).

Above-mentioned pressing plate (9) is provided with backing plate (11) with the contact-making surface of drift fixed head (8).

The end face of above-mentioned bending die (4) is provided with limiting plate (12).

The below of above-mentioned drift fixed head (8) also is equiped with the cushion (13) that contacts with limiting plate (12).

The top of above-mentioned bending die (4) one sides is equiped with ejector block (14).

The both sides of above-mentioned bending die (4) are equiped with fixed block (15) respectively.

Lubricant is coated on the surface of above-mentioned pipe (2) variable curvature type groove (41).

The inner chamber of above-mentioned pipe (2) can be equipped with filler or plug.

The utility model is owing to adopt variable curvature type groove to substitute traditional permanent curvature type groove, the utility model in the course of the work, big concentrated distortion is dispersed in the different stages to be finished, once pushing away the curved permanent relatively curvature bending of process, bigger distortion can be obtained, big angle of bend and less bending radius can be obtained.Along with Development on numerical control (NC) Technology, the processing of curve and curved surface no longer becomes difficulty, has practical promotional value so improve the curvature-variable push-bending process mould therefor of pipe fitting flexural deformation degree.The utility model both can improve the Transformation of Bendt Pipe degree, can improve the production efficiency of bend pipe again, be a kind of simple in structure, convenient and practical, can significantly reduce production costs, improve the quality of products, create the thin-wall tube curvature-variable push-bending process mould therefor of distinct economic.

4, description of drawings:

Fig. 1 is the variable curvature track configuration schematic diagram of the variable curvature type groove (41) of bending die (4) among the utility model mould embodiment 1;

Fig. 2 is the structural representation of the utility model mould embodiment 1;

Fig. 3 is the structural representation of the utility model mould embodiment 2.

5, the specific embodiment:

Embodiment 1:

The structural representation of the utility model thin-wall tube curvature-variable push-bending process mould therefor as shown in Figure 2, include and push away curved drift (1), bending die (4), lower bolster (5), drift fixed head (8), cope match-plate pattern (9), pushing away curved drift (1) is installed on the drift fixed head (8), drift fixed head (8) is connected with cope match-plate pattern (9) by connector (10), bending die (4) places the below that pushes away curved drift (1), and be installed on the lower bolster (5), wherein be provided with variable curvature type groove (41) in the bending die (4), pipe (2) is placed on the straight line portion in the variable curvature type groove (41) of bending die (4).

Steady in order to ensure the motion that pushes away curved drift (1), above-mentioned lower bolster (5) is provided with two guide pillars (6), cope match-plate pattern (9) with the corresponding position of guide pillar (6) on be provided with two guide pin bushings (7) that can slide along guide pillar (6).

For the ease of determining to push away the movement travel of curved drift (1), the end face of above-mentioned bending die (4) is provided with limiting plate (12).

For the ease of bending die (4) is installed, the both sides of above-mentioned bending die (4) are equiped with fixed block (15) respectively.

The distortion situation of pipe and prevent the generation of bad phenomenon such as unstability is wrinkling when improving bending, lubricant is coated on the surface of above-mentioned pipe (2) variable curvature type groove (41), and the inner chamber of above-mentioned pipe (2) can be equipped with filler or plug.

The utility model embodiment from production application easily angle select the variable curvature equation of locus of involute for use as the variable curvature type groove (41) of bending die (4), when using involute and pushing away curved leading line as rectangle or circular tube, both can on same curve, select for use different intervals to satisfy and be bent the requirement of part angle of bend and radius, also can be by choosing corresponding curve interval on the involute that forms by different base radius.Its structural representation as shown in Figure 1, if select to push away the variable curvature radius bend pipe that curves 90 ° in a) at Fig. 1, minimum bending radius is r=20mm.At first obtain the position of least radius:

Add 90 ° then on this basis and promptly obtain the interval θ that requires _e=114,6 °+90 °=204,6 °, as Fig. 1 b) shown in, according to the flexure type groove of selected section processing as Fig. 1 c) shown in.Can choose desired section similarly. in addition can also also choose corresponding section thereon by the base radius of conversion involute.

During the utility model work, earlier pipe (2) is placed in the variable curvature type groove (41) of bending die (4), be about to push away curved drift (1) under the forcing press and promote pipe (2) and carry out flexural deformation be configured as part (3) in variable curvature type groove (41), part (3) is taken out in last die sinking.

Embodiment 2:

The utility model thin-wall tube curvature-variable push-bending process is identical with embodiment 1.The structural representation of its mould therefor as shown in Figure 3, its structure is identical with embodiment 1, difference is that bool need finish in long pushing away in the detour footpath, for this reason, the below of above-mentioned drift fixed head (8) also is equiped with the cushion (13) that contacts with limiting plate (12), and is bigger with the impulsive force of limiting plate (12) to avoid pushing away curved drift (1).In addition, take out part (3) for making things convenient for die sinking, the top of above-mentioned bending die (4) one sides is equiped with ejector block (14).

Operation principle of the present utility model is identical with embodiment 1.

Claims

1, the mould that a kind of thin-wall tube curvature-variable push-bending process is used, include and push away curved drift (1), bending die (4), lower bolster (5), drift fixed head (8), cope match-plate pattern (9), wherein pushing away curved drift (1) is installed on the drift fixed head (8), drift fixed head (8) is connected with cope match-plate pattern (9) by connector (10), bending die (4) places the below that pushes away curved drift (1), and be installed on the lower bolster (5), it is characterized in that being provided with in the bending die (4) variable curvature type groove (41), pipe (2) is placed on the straight line portion in the variable curvature type groove (41) of bending die (4).

2, mould according to claim 1 is characterized in that above-mentioned lower bolster (5) is provided with two guide pillars (6), cope match-plate pattern (9) with the corresponding position of guide pillar (6) on be provided with two guide pin bushings (7) that can slide along guide pillar (6).

3, mould according to claim 1 is characterized in that the above-mentioned pressing plate (9) and the contact-making surface of drift fixed head (8) are provided with backing plate (11).

4, mould according to claim 1 is characterized in that the end face of above-mentioned bending die (4) is provided with limiting plate (12).

5,, it is characterized in that the below of above-mentioned drift fixed head (8) also is equiped with the cushion (13) that contacts with limiting plate (12) according to claim 1 or 2 or 3 or 4 described moulds.

6, mould according to claim 5 is characterized in that the top of above-mentioned bending die (4) one sides is equiped with ejector block (14).

7, mould according to claim 6 is characterized in that the both sides of above-mentioned bending die (4) are equiped with fixed block (15) respectively.

8, mould according to claim 7 is characterized in that lubricant is coated on the surface of above-mentioned pipe (2) variable curvature type groove (41).

9, mould according to claim 8 is characterized in that the inner chamber of above-mentioned pipe (2) can be equipped with filler or plug.