Gas-liquid mixed medium proportioning and filling device for pressing forming of thin-walled pipe

Abstract

The invention belongs to the technical field of fluid pressure forming, and relates to a thin-walled tube pressing forming gas-liquid mixed medium proportioning and filling device which comprises a liquid filling unit, an inflation unit and a medium filling unit. According to the device, the mixed medium filling cylinder can be quantitatively filled with liquid, then the medium filling cylinder is filled with gas, certain initial pressure is achieved, so that quantitative proportioning of the gas and the liquid is completed, and finally the proportioned gas-liquid mixed medium is filled into a pipe fitting to be used for supporting the pipe fitting during pressing forming; the problems that gas-liquid mixed media are difficult to proportion and difficult to fill and transfer are solved. The forming step duration is only the duration consumed by medium filling and pressing forming, gas-liquid matching of the next pipe fitting is completed while the pipe fitting is formed, and compared with the mode that liquid is firstly filled in the pipe, then inflation is conducted, and then pressing forming is conducted, the forming method has the advantages of being high in filling efficiency, short in process, short in working procedure time and the like, and therefore the forming efficiency can be greatly improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of fluid pressure forming, and relates to a gas-liquid medium proportioning and filling device, in particular to a thin-walled tube pressing forming gas-liquid mixed medium proportioning and filling device, which is a gas-liquid mixed medium proportioning and high-efficiency filling device for thin-walled tube pressing forming. BACKGROUND

[0002] Fluid pressure forming technology is widely used in the forming of complex thin-walled metal pipe fittings. Common fluid pressure forming technologies include liquid expansion forming, gas expansion forming and pressing forming technology. Pressing forming is different from traditional expansion forming technology. It can form complex parts at room temperature and low pressure. The part forming mainly relies on mold closing and pressing. The internal pressure plays a supporting role. The gas-liquid mixed pressing forming fills gas and liquid into the pipe at the same time, which can realize automatic and smooth change of pressure during pressing. Therefore, it has the advantages of stable forming process, high forming efficiency and strong forming capacity, and can be used for mass production of large-size complex thin-walled components of high-end moped, automobile and aerospace.

[0003] The proportioning and stable filling of internal gas-liquid mixed medium in the gas-liquid mixed pressing forming process will affect the forming effect and the forming efficiency, which is the key factor to determine whether the gas-liquid mixed pressing forming process can be mass produced. The existing device has the disadvantages of hardware (unsealed pipeline, liquid backflow, gas escape, etc.), which leads to deviation between the actual value and the set value of liquid or gas filling. Moreover, there is no mature device on the market for gas-liquid mixed medium proportioning and rapid filling, which greatly limits the development of gas-liquid mixed pressing forming process. Therefore, it is urgent to develop a new device for realizing the proportioning and high-efficiency filling of gas-liquid mixed medium. SUMMARY

[0004] The present application provides a gas-liquid mixed pressing forming medium proportioning and filling device to solve the problem that there is no mature device on the market for gas-liquid mixed medium proportioning and high-efficiency filling, and to ensure that the gas-liquid mixed pressing forming technology can be stably and efficiently mass produced. The present application controls the flow direction of fluid by using a one-way valve to prevent backflow, and controls the flow of liquid by using a solenoid valve to quickly open and close, thereby ensuring the accuracy of liquid and gas filling precision. The combination of liquid and gas filling forms a new device, which realizes the proportioning of quantitative gas-liquid ratio in the gas-liquid mixing process. The related device of the present application fills the gap of gas-liquid mixing proportioning.

[0005] Technical scheme of the present application:

[0006] A thin-walled tube pressing forming gas-liquid mixed medium proportioning and filling device, comprising a liquid filling unit, a gas filling unit and a medium filling unit.

[0007] The medium filling unit comprises a filling servo cylinder 4, a piston 5, a filling cylinder 6, a filling check valve 8, a solenoid valve 9 and a plug check valve 14; the filling cylinder 6 has an open structure at one end and is used for mounting the piston 5; the other end is provided with three openings for mounting a liquid inlet check valve 7, the filling check valve 8 and an air inlet check valve 11 respectively; the output end of the filling servo cylinder 4 is connected with the piston 5 and is used for reciprocating movement of the piston 5 in the filling cylinder 6.

[0008] The liquid filling unit comprises a liquid inlet servo cylinder 1, a liquid filling cylinder 2, a liquid tank 3 and a liquid check valve 7; the liquid tank 3 is connected with the liquid filling cylinder 2 through a pipeline; the liquid filling cylinder 2 is connected with the liquid inlet check valve 7 through a pipeline; the output end of the liquid inlet servo cylinder 1 is connected with the liquid filling cylinder 2 and is used for controlling the amount of liquid 19 in the liquid filling cylinder 2 flowing into the filling cylinder 6.

[0009] The air filling unit comprises a pressure sensor 10, an air inlet check valve 11, a gas storage cylinder 12 and an air filling control cabinet 13; the air filling control cabinet 13 is connected with the gas storage cylinder 12 and the air inlet check valve 11 through pipelines respectively and is used for controlling the amount of gas in the gas storage cylinder 12 flowing into the filling cylinder 6; the pressure sensor 10 is arranged in the filling cylinder 6 and is used for measuring the gas pressure in the filling cylinder 6.

[0010] The plug check valve 14 is mounted on a pipe sealing plug 15 and is used for controlling the one-way flow of the gas-liquid mixed medium 20 into the formed pipe 18; the pipeline between the filling check valve 8 and the plug check valve 14 is provided with the solenoid valve 9, and the solenoid valve 9 is opened and closed for controlling the interval filling of the gas-liquid mixed medium 20 into the pipe.

[0011] The liquid in the liquid tank 3 is water, oil or other liquid medium.

[0012] The beneficial effects of the present application are as follows:

[0013] Firstly, the gas-liquid mixed medium ratio and filling device can quantitatively fill liquid into the mixed medium filling cylinder, then fill gas into the medium filling cylinder with a certain initial pressure, thereby completing the ratio of gas and liquid, and finally filling the well-ratioed gas-liquid mixed medium into the pipe for supporting the pipe during press forming, thereby solving the problems of difficult quantitative ratio of gas-liquid mixed medium and difficult filling and transfer.

[0014] Secondly, the gas-liquid mixed medium ratio and filling device comprises a liquid filling unit, an air filling unit and a medium filling unit, each unit can work independently or cooperatively, and can independently complete the stable, accurate and quantitative filling of liquid medium, gas medium and well-ratioed gas-liquid mixed medium according to needs, and has the advantages of high medium filling efficiency, strong medium filling capacity and good medium filling stability.

[0015] Third, the gas-liquid mixing and filling device of the present invention first completes the gas and liquid ratio, and then fills the ratiod gas-liquid mixing medium into the forming pipe. The forming step time is only the time consumed by medium filling and pressing forming. The gas-liquid ratio of the next pipe is completed at the same time as the pipe forming. Compared with filling the pipe with liquid first, then filling with gas and then pressing forming, it has the advantages of high filling efficiency, short process and short process time, thus greatly improving the forming efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a thin-walled tube pressing and forming gas-liquid mixing medium proportioning and filling device according to the present invention;

[0017] Figures 2(a) to 2(c) Figure 2(a) shows the working process of a thin-walled tube pressing and forming gas-liquid mixing medium proportioning and filling device of the present invention; wherein, Figure 2(a) shows the quantitative liquid filling process, Figure 2(b) shows the constant pressure gas filling process to complete the gas-liquid proportioning process, and Figure 2(c) shows the process of rapid and efficient transfer of gas-liquid mixing medium into the formed tube.

[0018] In the diagram: 1-filling servo electric cylinder; 2-filling cylinder; 3-liquid tank; 4-filling servo electric cylinder; 5-piston; 6-filling cylinder; 7-filling check valve; 8-filling check valve; 9-filling solenoid valve; 10-pressure sensor; 11-gas check valve; 12-gas storage cylinder; 13-gas filling control cabinet; 14-plug check valve; 15-pipe sealing plug; 16-upper mold; 17-lower mold; 18-forming pipe fitting; 19-liquid medium; 20-gas-liquid mixed medium. Detailed Implementation

[0019] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and technical solutions.

[0020] like Figure 1 As shown, a thin-walled tube pressing and forming gas-liquid mixing medium proportioning and filling device includes a liquid servo cylinder 1, a filling cylinder 2, a liquid tank 3, a filling servo cylinder 4, a piston 5, a filling cylinder 6, a liquid inlet check valve 7, a filling check valve 8, a filling solenoid valve 9, a pressure sensor 10, an air inlet check valve 11, a gas storage cylinder 12, a gas filling control cabinet 13, a pipe fitting sealing plug 14, and a plug check valve 15.

[0021] The liquid filling servo electric cylinder 1, liquid filling cylinder 2, liquid tank 3, and liquid inlet check valve 7 constitute a liquid filling unit, which is used to fill a certain amount of liquid medium 19 into the filling cylinder 6.

[0022] The gas storage cylinder 12, the filling control cabinet 13, the pressure sensor 10, and the one-way valve 11 constitute the filling unit, which is used to precisely pressurize and fill the filling cylinder 6 with gas to form a gas-liquid mixture 20.

[0023] The filling servo motor 4, the piston 5, the filling cylinder 6, the filling check valve 8, the electromagnetic valve 9, and the plug check valve 14, etc. constitute a gas-liquid mixed medium filling unit, which is used to quickly and efficiently transfer the gas-liquid mixed medium 20 into the formed pipe 18.

[0024] The pipe sealing plug 15, the upper mold 16, the lower mold 17, and the formed pipe 18, etc. constitute a gas-liquid mixed component forming unit, after the inside of the pipe 18 to be formed is filled with the gas-liquid mixed medium, the upper mold 16 descends to complete the gas-liquid mixed compression forming process.

[0025] For the liquid filling unit, the gas filling unit, and the medium filling unit, each unit can work independently or cooperatively. Figures 2(a) to 2(c) As shown, the specific working steps are as follows:

[0026] Step one, the liquid filling unit acts to start filling the liquid medium 19 into the filling cylinder 6;

[0027] Step two, the gas filling unit acts to fill a certain amount of gas into the filling cylinder 6, and stops when the pressure in the filling cylinder 6 reaches the set value, at which time the quantitative proportioning of the gas-liquid mixed medium 20 is completed;

[0028] Step three, the filling unit acts to transfer the proportioned gas-liquid mixed medium 20 into the formed pipe 18, completing the process of filling the gas-liquid mixed medium 20 into the pipe;

[0029] Step four, the forming unit acts to complete the forming of the pipe to obtain the final part; while the forming unit is acting, steps one and two are sequentially performed, i.e., the liquid filling unit and the gas filling unit sequentially act to complete the proportioning of the gas-liquid mixed medium for the next pipe;

[0030] Step five, steps three and four are repeated to complete the batch production of the gas-liquid mixed compression forming process parts.

[0031] Among them, steps one, two, and three complete the proportioning and transfer of the gas-liquid mixed medium, solving the problems of difficult proportioning and filling and transfer of the gas-liquid mixed medium; step four realizes the overlapping of the processes of proportioning and compression forming of the gas-liquid mixed medium, which shortens the medium filling time by half compared to directly filling the liquid and then the gas into the pipe, thereby greatly improving the forming efficiency of the parts.

[0032] The liquid filling unit acts alone and the gas filling unit does not act, filling a certain volume of liquid into the formed pipe 18, which can complete the quantitative filling of a single liquid medium. For some simple-shaped pipes, separate liquid filling can meet the needs of internal support for compression forming, and the above device can realize separate liquid filling action, further improving the medium filling efficiency.

[0033] The inflation unit acts alone, the liquid filling unit does not act, the gas with a certain pressure is filled into the formed pipe 18, and the quantitative filling of a single gas medium can be completed. For the pipe with not too high internal support pressure, the single inflation can meet the needs of the pressing forming internal support. The above device can realize the single inflation action, and further improves the medium filling efficiency.

Claims

1. A thin-walled tube press forming gas-liquid mixed medium proportioning and filling device, characterized in that, The device comprises a liquid filling unit, an air filling unit and a medium filling unit. The medium filling unit comprises a filling servo cylinder (4), a piston (5), a filling cylinder (6), a filling check valve (8), a solenoid valve (9) and a plug check valve (14); the filling cylinder (6) has an open structure at one end for mounting the piston (5), and has three openings at the other end for mounting a liquid inlet check valve (7), the filling check valve (8) and an air inlet check valve (11) respectively; the output end of the filling servo cylinder (4) is connected with the piston (5) for reciprocating movement of the piston (5) in the filling cylinder (6); The liquid filling unit comprises a liquid inlet servo cylinder (1), a liquid filling cylinder (2), a liquid tank (3) and a liquid inlet check valve (7); the liquid tank (3) is connected with the liquid filling cylinder (2) through a pipeline, the liquid filling cylinder (2) is connected with the liquid inlet check valve (7) through a pipeline, and the output end of the liquid inlet servo cylinder (1) is connected with the liquid filling cylinder (2) for controlling the amount of liquid in the liquid filling cylinder (2) flowing into the filling cylinder (6); The air filling unit comprises a pressure sensor (10), an air inlet check valve (11), a gas storage cylinder (12) and an air filling control cabinet (13); the air filling control cabinet (13) is connected with the gas storage cylinder (12) and the air inlet check valve (11) through pipelines respectively for controlling the amount of gas in the gas storage cylinder (12) entering the filling cylinder (6); the pressure sensor (10) is arranged in the filling cylinder (6) for measuring the gas pressure in the filling cylinder (6); The plug check valve (14) is mounted on a pipe sealing plug (15) for controlling the gas-liquid mixed medium entering a formed pipe (18); the solenoid valve (9) is arranged on the pipeline between the filling check valve (8) and the plug check valve (14) for quickly opening and closing the pipeline to realize accurate filling of liquid and gas.

2. The apparatus according to claim 1, wherein, The liquid in the liquid tank (3) is water or oil.

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