Pipe blank positioning equipment for hot gas expansion machining of pipes

Abstract

The utility model belongs to the technical field of pipe thermal expansion processing, and particularly relates to pipe blank positioning equipment for pipe thermal expansion processing, which comprises a lower die, a lower cavity is arranged on the lower die, mounting blocks are symmetrically arranged on the lower die, the mounting blocks are arranged at two ends of the lower cavity, end positioning mechanisms and sealing mechanisms are arranged on the mounting blocks, and the sealing mechanisms are arranged on the end positioning mechanisms. The sealing mechanism comprises a sealing head and a sealing driving device, the sealing driving device is in transmission connection with the sealing head, the sealing driving device drives the sealing head to move towards or away from the lower cavity, the end positioning mechanism is used for positioning the end face of a pipe blank, and the sealing head is communicated with air supply equipment. According to the utility model, the problems of position deviation, shifting and inaccurate direction of a hot air expansion pipe blank when the hot air expansion pipe blank is put into a mold cavity can be solved, and the problem of leakage of high-pressure sealing during hot air expansion forming is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of pipe hot gas expansion processing's pipe blank positioning equipment, belong to pipe hot expansion gas processing technical field. BACKGROUND

[0002] In pipe hot gas expansion forming processing, generally directly using end pick-up to grab the pipe blank after heating is completed, then under the transfer of automatic robot, pipe blank is directly put into mould cavity.This pick-up and feeding mode requires higher precision for tooling and automatic transmission equipment, once the posture or position of pipe blank fluctuates in transmission process, the position and posture of pipe blank when entering mould cavity are uncertain, the position of pipe blank in mould cavity cannot be guaranteed, and it is extremely easy to cause the situation that the profile modeling of pipe blank does not match mould cavity profile.Because pipe hot gas expansion forming process is realized by sealing through extruding pipe end, and pipe has no obvious profile and hole as positioning, therefore, the position of pipe put into expansion mould is required higher, if reliable sealing cannot be formed due to inaccurate pipe placement position, pipe blank is prone to leak, which will lead to expansion failure of hot gas expansion product or product size precision defect;Moreover, long-term production in this state will cause wear to mould steel block and sealing assembly, and even directly damage mould in serious case.

[0003] Therefore, in pipe hot gas expansion forming processing, how to improve the position precision of hot gas expansion pipe blank feeding is a technical problem to be solved by the person skilled in the art. SUMMARY

[0004] The utility model provides a kind of pipe hot gas expansion processing's pipe blank positioning equipment for the above technical problems.

[0005] The technical scheme that the utility model solves above technical problems is as follows: a kind of pipe hot gas expansion processing's pipe blank positioning equipment, including lower mould, the lower mould is equipped with lower cavity, the lower mould is symmetrically equipped with mounting block, the mounting block is equipped in the both ends of the lower cavity, the mounting block is equipped with end positioning mechanism and sealing mechanism, the sealing mechanism includes sealing head and sealing drive device, the sealing drive device is connected with the sealing head transmission, the sealing drive device drives the sealing head towards or away from the lower cavity movement, the end positioning mechanism is used to position the end surface of pipe blank, the sealing head is connected with gas supply equipment.

[0006] The utility model discloses beneficial effect lies in: the utility model discloses through the end positioning mechanism to the pipe blank on the pipe blank of input lower cavity carries out the initial positioning, after the pipe blank is pressed into the cavity, again through the sealing mechanism to the pipe blank carries out the positioning and extrusion on the shaft, guarantees the sealing degree of pipe blank, carries out the thermal expansion gas processing again;The utility model can solve the problem of position deviation, shift and direction inaccuracy of pipe blank when hot gas expansion pipe blank is input into the mould cavity, and the problem of high pressure sealing leakage during hot gas expansion forming is solved by accurate positioning and sealing to the pipe blank after inputting the mould;In addition, the utility model can realize quick positioning and sealing, reduce the downtime of on-line of material fluctuation or failure, and significantly improve production efficiency.

[0007] On the basis of the above technical scheme, the utility model still can make as follows improvement:

[0008] Further, the end of the sealing head is in the shape of a truncated cone, and the end face of the sealing head is provided with a gas inlet.

[0009] The beneficial effects of the above further technical scheme are: by setting the sealing head in the shape of a truncated cone, the positioning of the pipe blank port and the compression and sealing of the inner wall of the pipe blank are facilitated, and the operation is convenient and the positioning and sealing effects are good.

[0010] Further, the sealing drive device comprises a sealing oil cylinder, the sealing oil cylinder is installed on the mounting block, and the piston rod end of the sealing oil cylinder is connected with the sealing head.

[0011] The beneficial effects of the above further technical scheme are: by driving the movement of the sealing head through the sealing oil cylinder and providing the pressure maintaining power during sealing, the sealing effect of the pipe blank is more stable and less likely to leak.

[0012] Further, the end positioning mechanism comprises an end positioning plate and a positioning drive device, the positioning drive device is in transmission connection with the end positioning plate, and the positioning drive device drives the end positioning plate to move towards or away from the lower cavity.

[0013] The beneficial effects of the above further technical scheme are: by positioning the end face of the pipe blank through the end positioning plate, the initial positioning and alignment of the pipe blank after being input into the mould cavity are realized, and the subsequent sealing positioning is more accurate.

[0014] Further, the positioning drive device comprises a positioning cylinder, the positioning cylinder is installed on the mounting block, and the piston rod end of the positioning cylinder is connected with the end positioning plate.

[0015] The beneficial effects of the above further technical scheme are: by realizing the movement of the end positioning plate through the extension and retraction of the piston rod of the positioning cylinder, the end face of the pipe blank is positioned.

[0016] Further, the upper surface of the lower cavity is symmetrically provided with a material supporting plate, which is movably installed on the lower cavity.

[0017] The beneficial effects of the further technical scheme are that the pipe blank is supported by the material supporting plate, and the pipe blank is conveniently positioned and aligned.

[0018] Further, the bottom of the material supporting plate is installed through a nitrogen spring.

[0019] The beneficial effects of the further technical scheme are that the material supporting plate is installed through the nitrogen spring, the movement of the material supporting plate on the lower cavity is realized through compression of the nitrogen spring, and the pipe blank is conveniently pressed into the lower cavity by the upper die.

[0020] Further, the upper die is further provided with an upper cavity.

[0021] Further, the upper surface of the material supporting plate and the bottom surface of the material pressing plate are respectively provided with arc-shaped recesses, and the shape and size of the arc-shaped recesses are adapted to the pipe blank. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a three-dimensional structure schematic diagram of the utility model;

[0023] Figure 2 It is another angle three-dimensional structure schematic diagram of the utility model;

[0024] Figure 3 It is a front view of the utility model;

[0025] Figure 4 It is a top view of the utility model;

[0026] Figure 5 It is a working step one schematic diagram of the utility model;

[0027] Figure 6 It is a working step two schematic diagram of the utility model;

[0028] Figure 7 It is a working step three schematic diagram of the utility model;

[0029] Figure 8 It is a working step four schematic diagram of the utility model;

[0030] Figure 9 It is a working step four die closing completed schematic diagram of the utility model;

[0031] Figure 10 It is a working step five schematic diagram of the utility model.

[0032] The reference signs are recorded as follows: 1, lower die; 101, lower cavity; 102, mounting block; 103, material supporting plate; 201, sealing head; 202, sealing oil cylinder; 301, end positioning plate; 302, positioning cylinder; 401, upper cavity; 402, material pressing plate; 5, pipe blank. DETAILED DESCRIPTION

[0033] The principles and characteristics of the present application are described below in combination with the drawings, and the examples are only used to explain the present application and are not used to limit the scope of the present application.

[0034] Referring to Figures 1-4 A pipe blank positioning device for hot gas expansion processing of pipes, comprising a lower die 1, wherein the lower die 1 is provided with a lower cavity 101, the upper surface of the lower cavity 101 is provided with a groove, the shape of the groove is matched with the shape of the pipe blank 5 to be processed, the lower die 1 is symmetrically provided with a mounting block 102, the mounting block 102 is arranged outside both ends of the lower cavity 101, the mounting block 102 is provided with an end positioning mechanism and a sealing mechanism, the sealing mechanism comprises a sealing head 201 and a sealing driving device, the sealing driving device is in transmission connection with the sealing head 201, the sealing driving device drives the sealing head 201 to move towards or away from the lower cavity 101, the end positioning mechanism is used for positioning the end face of the pipe blank 5, and the sealing head 201 is in communication with a gas supply device.

[0035] The end of the sealing head 201 is in the shape of a truncated cone, the end face of the sealing head 201 is provided with a gas supply port, and the gas supply device supplies gas into the pipe blank 5 through the gas supply port.

[0036] The sealing driving device comprises a sealing oil cylinder 202, the sealing oil cylinder 202 is mounted on the mounting block 102, and the piston rod end of the sealing oil cylinder 202 is connected with the sealing head 201.

[0037] The end positioning mechanism comprises an end positioning plate 301 and a positioning driving device, the positioning driving device is in transmission connection with the end positioning plate 301, and the positioning driving device drives the end positioning plate 301 to move towards or away from the lower cavity 101. The height of the end positioning plate 301 is higher than the height of the sealing head 201, the pipe blank 5 is positioned by the end positioning plate 301 before the upper die is closed, and the pipe blank 5 is positioned by the sealing head 201 after the upper die is closed, therefore, the height of the end positioning plate 301 is arranged above the sealing head 201, and the height change of the pipe blank 5 before and after the die is closed is matched.

[0038] The positioning driving device comprises a positioning cylinder 302, the positioning cylinder 302 is mounted on the mounting block 102, and the piston rod end of the positioning cylinder 302 is connected with the end positioning plate 301.

[0039] The upper surface of the lower cavity 101 is symmetrically provided with a material supporting plate 103, which is movably installed on the lower cavity 101. The bottom of the material supporting plate 103 is installed on the lower cavity 101 through a nitrogen spring.

[0040] Further comprising an upper mold, which is provided with an upper cavity 401, and the upper surface of the upper cavity 401 is provided with a groove, which is shaped to be matched with the shape of the pipe blank 5 to be processed.

[0041] The upper cavity 401 is provided with a material pressing plate 402 corresponding to the material supporting plate 103, and the upper surface of the material supporting plate 103 and the bottom surface of the material pressing plate 402 are respectively provided with arc-shaped recesses, which are shaped and sized to be matched with the pipe blank 5, so that when the upper mold is pressed down to close the mold, the material supporting plate 103 and the material pressing plate 402 jointly press the pipe blank 5.

[0042] Referring to Figures 5-10 The working process of the utility model is as follows:

[0043] I. After the pipe blank 5 is heated (the pipe blank 5 can be heated to 930-970 DEG C through a heating furnace or resistance heating), the pipe blank 5 is placed on the material supporting plate 103 of the lower cavity 101 by using a mechanical hand or an automatic end picker.

[0044] II. The piston rod of the positioning cylinder 302 is elongated to drive the end positioning plate 301 to position and align in the axial direction of the pipe blank 5, so that the position of the pipe blank 5 in the lower cavity 101 is accurate; after positioning is completed, the piston rod of the positioning cylinder 302 is retracted.

[0045] III. The mold is closed, and the material pressing plate 402 of the upper mold first contacts the material supporting block of the lower cavity 101 to tightly hold the pipe blank 5, so that the position of the pipe blank 5 is fixed.

[0046] IV. When the upper mold is lowered, the material pressing body of the upper mold is lowered at the same time, and the material supporting plate 103 is lowered to compress the nitrogen spring, and the pipe blank 5 in the tightly held state enters the groove of the lower cavity 101; the upper mold continues to be lowered, and the upper and lower molds 1 are closed;

[0047] V. The piston rod of the sealing cylinder 202 is elongated to push the sealing head 201 to insert into the pipe orifice at both ends of the pipe blank 5, complete the taper surface contact sealing of the pipe orifice at both ends of the pipe blank 5, then high-pressure gas of 5-70 MPa is introduced to inflate the pipe, and at the same time, the upper and lower molds 1 are closed to the pipe blank 5 to maintain pressure and rapidly cool.

[0048] Six, after the expansion processing is completed, the piston rod of the sealing oil cylinder 202 is retracted, the upper die is raised, the mold is opened, the nitrogen spring is reset, the material supporting plate 103 is driven to rise, the pipe blank 5 rises above the lower cavity 101 under the lifting of the material supporting plate 103, the end picker takes out the formed pipe blank 5, and the processing is completed.

[0049] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A tube blank positioning device for hot gas expansion processing of tubes, comprising a lower mold (1), wherein the lower mold (1) is provided with a lower cavity (101), characterized in that, The lower mold (1) is symmetrically provided with mounting blocks (102), which are located at both ends of the lower cavity (101). The mounting blocks (102) are provided with an end positioning mechanism and a sealing mechanism. The sealing mechanism includes a sealing head (201) and a sealing drive device. The sealing drive device is connected to the sealing head (201) in a transmission manner. The sealing drive device drives the sealing head (201) to move toward or away from the lower cavity (101). The end positioning mechanism is used to position the end face of the tube blank. The sealing head (201) is connected to the gas supply device.

2. The tube blank positioning equipment for hot gas expansion processing of tubes according to claim 1, characterized in that, The end of the sealing head (201) is truncated cone-shaped, and an air supply port is provided on the end face of the sealing head (201).

3. The tube blank positioning equipment for hot gas expansion processing of tubes according to claim 2, characterized in that, The sealing drive device includes a sealing cylinder (202), which is mounted on the mounting block (102), and the piston rod end of the sealing cylinder (202) is connected to the sealing head (201).

4. The tube blank positioning equipment for hot gas expansion processing of tubes according to claim 1, characterized in that, The end positioning mechanism includes an end positioning plate (301) and a positioning drive device. The positioning drive device is connected to the end positioning plate (301) in a transmission manner. The positioning drive device drives the end positioning plate (301) to move toward or away from the lower cavity (101).

5. The tube blank positioning equipment for hot gas expansion processing of tubes according to claim 4, characterized in that, The positioning drive device includes a positioning cylinder (302), which is mounted on the mounting block (102), and the piston rod end of the positioning cylinder (302) is connected to the end positioning plate (301).

6. The tube blank positioning device for hot gas expansion processing of tubes according to claim 1, characterized in that, The lower cavity (101) is symmetrically provided with a material support plate (103) on its upper surface, and the material support plate (103) is movably installed on the lower cavity (101).

7. The tube blank positioning device for hot gas expansion processing of tubes according to claim 6, characterized in that, The bottom of the material support plate (103) is mounted by a nitrogen spring.

8. The tube blank positioning device for hot gas expansion processing of tubes according to claim 7, characterized in that, It also includes an upper mold, which has an upper cavity (401).

9. The tube blank positioning device for hot gas expansion processing of tubes according to claim 8, characterized in that, A pressure plate (402) is provided on the upper cavity (401) corresponding to the material support plate (103).

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