CN104874664B - Alloy pipe fitting electromagnetic bulging and flanging synchronous forming device and method - Google Patents

Abstract

The invention relates to alloy pipe fitting electromagnetic bulging and flanging synchronous forming device which comprises a workbench. A front guide plate and a rear guide plate are fixed on the workbench. A left die and a right die which slide towards each other or oppositely are symmetrically disposed in a slideway formed by the front guide plate and the rear guide plate. The left die and the right die are slidably connected with an upper die plate. The upper die plate is connected with a die shank hydraulic cylinder driving the upper die plate to move up and down. The front and rear ends of the left and right support plates of the left and right dies are in transmission connection through guide column guide sleeve components. A reset spring sleeves each guide column. A solenoid coil component penetrating the workbench penetrates the matching part of the each of the left die and the right die. A tubing sleeves each solenoid coil component. Each solenoid coil component is connected with a support hydraulic cylinder through a support component. The invention further relates to an alloy pipe fitting electromagnetic bulging and flanging synchronous forming method. By the alloy pipe fitting electromagnetic bulging and flanging synchronous forming device and method, bulging and flanging synchronous forming is achieved, workpiece resilience is reduced, and die manufacturing difficulty is lowered.

Description

Electromagnetic bulging and flanging synchronous forming device and method for alloy pipe fittings

technical field

The invention relates to an electromagnetic bulging and flanging synchronous forming device and method for an alloy pipe fitting.

Background technique

With the development of modern industry and science and technology, people have higher and higher requirements on the performance of materials, and the precise forming and processing of some difficult-to-form materials has become a technical problem to be solved urgently. In recent years, in order to effectively reduce energy consumption and reduce environmental pollution, lightweight has become the mainstream trend of modern structural design. The application of lightweight, high-strength and difficult-to-form materials represented by aluminum alloys in advanced manufacturing fields such as automobiles and aerospace vehicles increasing day by day. However, it is well known that aluminum alloys have poor room temperature formability. When the aluminum alloy is quasi-statically formed by ordinary stamping technology, its forming limit is much lower than that of steel, and it is easy to crack in the high-strain area; due to the low rigidity of the aluminum alloy, the parts rebound after unloading and are prone to distortion , thus greatly reducing the dimensional accuracy.

The traditional tube material bulging process uses rigid mold bulging and soft mold bulging. Rigid mold bulging is only suitable for bulging processing of axisymmetric bulging parts that do not require high shape and dimensional accuracy. Soft mold bulging uses liquid , gas, rubber, paraffin, PVC plastic, etc. are used as the force transmission medium, and the forming speed is slow. When using liquid and gas, it is necessary to consider the sealing performance. When using rubber, the repeated deformation of the soft mold will cause problems such as aging and failure. At the same time, the traditional pipe flanging process often uses punch reaming, pressing and other multi-pass processes to complete the pipe flanging. The process is cumbersome, and multiple plastic deformations are prone to work hardening, which reduces the forming limit of the pipe.

For some complex workpieces, such as pipe fittings with flanging at both ends and bulging in the middle, the traditional process often requires multi-pass forming, and the process is complicated, which is easy to cause springback and reduce dimensional accuracy.

Contents of the invention

The technical problem to be solved by the present invention is to provide an alloy pipe fitting electromagnetic bulging and flanging synchronous forming device and method with simple process and high forming efficiency.

In order to solve the above technical problems, the technical solution of the present invention is: an alloy pipe fitting electromagnetic bulging and flanging synchronous forming device, including a workbench, on which the front and rear guide plates are fixed, and the front and rear The slideway formed by the guide plate is symmetrically arranged with left and right molds sliding towards or against each other along the slideway. The templates are slidingly connected, the upper template is connected with the hydraulic cylinder of the mold handle to drive the upper template to move up and down through the mold handle, and the front and rear ends of the left and right support plates of the left and right molds are guided by guide pillars. The sleeve components are mutually driven and connected, wherein the guide post is sleeved with a return spring to drive the left and right molds to slide, and the anastomotic part of the left and right molds is pierced with a solenoid coil assembly that runs through the workbench. The pipe coil assembly is covered with pipe material, and the solenoid coil assembly is connected with the support hydraulic cylinder through the support assembly.

Further, the left mold includes a left mold core, the left mold core is fixed in the groove of the C-shaped left mold frame, and a left support plate is fixed on the outside of the left mold frame; the right mold includes a right mold core , the right mold core is fixed in the groove of the C-shaped right mold frame, and the outside of the right mold frame is fixed with a right support plate.

Further, the left and right mold cores both include hemispherical inner cavities, and the two hemispherical inner cavities match each other to form a bulging shape by laminating the tube materials. The inner edges of one or both ends of the hemispherical inner cavities are in the shape The arc is used to fit the pipe material to form a flanging.

Further, the wedge assembly includes a left lower wedge and a right lower wedge respectively fixed on the outside of the left and right support plates, and the wedge assembly also includes a left upper wedge respectively fixed on the left and right sides of the lower end surface of the upper formwork block, upper right wedge, the lower left wedge is slidingly fitted with the upper left wedge, and the lower right wedge is slidingly fitted with the upper right wedge.

Further, the supporting assembly includes a flange for supporting the solenoid coil assembly, and also includes a transmission rod connected to the output shaft of the supporting hydraulic cylinder.

Further, the solenoid coil assembly includes a vertical insulating frame, the middle part of the insulating frame is spirally wound with a wire to form a solenoid coil, and the insulating frame is provided with a tube material outside the solenoid coil, so The bottom of the insulating frame is covered with a positioning sleeve for supporting the pipe material, and the bottom of the insulating frame is provided with a coil positive terminal and a coil negative terminal that pass through the flange.

Further, the positive terminal of the coil and the negative terminal of the coil are connected in series with the discharge control switch via a capacitor bank, and the capacitor bank is connected in parallel with the power supply.

Further, the left mold core is provided with a positioning wedge at the joint with the right mold core, and the right mold core is provided with a positioning groove matching with the positioning wedge at the joint with the left mold core.

Further, the oil circuit of the die handle hydraulic cylinder and the supporting hydraulic cylinder are respectively connected with two electromagnetic control valves in the hydraulic control box, and the two electromagnetic control valves are connected with the console through control lines.

A method for synchronous forming of electromagnetic bulging and flanging of alloy pipe fittings, providing each component of a device for simultaneous electromagnetic bulging and flanging of alloy pipe fittings described in any one of the above, including the following steps:

(1) The contraction of the supporting hydraulic cylinder drives the solenoid coil assembly to move to the lowest position. At this time, the distance between the upper end surface of the solenoid coil assembly and the lower end surface of the worktable is greater than the length of the original pipe material, and the shrinkage of the mold handle hydraulic cylinder drives the mold handle, The upper mold plate moves to the highest position. During the upward sliding movement of the upper mold plate along the wedge assembly, the left and right molds slide against each other along the slideway under the action of the return spring, and the left and right mold cores are separated;

(2) Put the pipe material outside the wire of the insulating frame, and the lower end of the pipe material is in contact with the upper end of the positioning sleeve;

(3) The operation console controls the hydraulic control box, controls the stretching of the support hydraulic cylinder to drive the support component to move to the working position, the stretching of the mold handle hydraulic cylinder drives the mold handle and the upper template to move downward, and the upper template moves along the wedge assembly. During the downward sliding movement, the left and right molds slide towards each other along the slideway under the action of the return spring, and the right and left mold cores are closed;

(4) The console controls the electromagnetic forming equipment to complete the charging of the capacitor bank, and then closes the discharge control switch, and the capacitor bank discharges the solenoid coil assembly. At this time, the two ends of the capacitor bank are connected in series with the solenoid coil to form a low-resistance discharge circuit. The high-frequency oscillating instantaneous large current is generated in the tube coil, and a pulsed strong magnetic field is generated around the solenoid coil, thereby generating eddy current in the tube material and then generating electromagnetic repulsion force to make the tube material move outward, and the tube material fits the left and right molds After the kernel is formed, it forms a bulging shape in the middle of the end flanging;

(5) Operate the console to control the hydraulic control box to complete step (1), and take out the bulging and flanging formed parts.

Compared with the prior art, the present invention has the following beneficial effects: by loading the pulse current in the solenoid coil, the tube material is bulged outward to fit the cavity, and the process of bulging in the middle of the flanging at both ends is realized at one time, It simplifies the technological process and reduces the springback of the workpiece; secondly, no force transmission medium is used, and there is no need to consider the problems of sealing and soft mold failure, which reduces the difficulty of mold manufacturing; again, the use of automatic control of the movement of the mold improves the forming efficiency.

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of an embodiment of the present invention.

Fig. 2 is a schematic top view of the embodiment of the present invention after removing the upper template.

Fig. 3 is a schematic top view of an embodiment of the present invention.

Fig. 4 is a schematic diagram of the structure of the support assembly according to the embodiment of the present invention.

Fig. 5 is a schematic diagram of the structure of a solenoid coil assembly according to an embodiment of the present invention.

Fig. 6 is a schematic diagram of the structure of the left and right mold cores of the embodiment of the present invention.

Fig. 7 is a schematic diagram of the structure of the formed part of the embodiment of the present invention.

FIG. 8 is a schematic diagram of generating electromagnetic repulsion force according to an embodiment of the present invention.

In the figure: 1-worktable, 2-front guide plate, 3-rear guide plate, 4-slide, 5-left mold, 51-left mold core, 511-positioning wedge, 512-left hemispherical cavity, 52 -Left mold frame, 53-left support plate, 6-right mold, 61-right mold core, 611-positioning groove, 612-right hemispherical cavity, 62-right mold frame, 63-right support plate, 7-top Template, 8-wedge assembly, 81-left upper wedge, 82-right upper wedge, 83-left lower wedge, 84-right lower wedge, 9-die handle, 10-die handle hydraulic cylinder, 11-guide column guide Set assembly, 111-guide post, 112-guide sleeve, 12-return spring, 13-solenoid coil assembly, 131-insulation frame, 132-solenoid coil, 133-coil positive connector, 134-coil negative connector, 14-pipe material, 15-positioning sleeve, 16-support assembly, 161-flange, 162-transmission rod, 17-support hydraulic cylinder, 18-magnetic control circuit, 19-oil circuit, 20-console.

detailed description

As shown in Figures 1 to 7, an alloy pipe fitting electromagnetic bulging and flanging synchronous forming device includes a workbench 1 on which a front guide plate 2 and a rear guide plate 3 are fixed, and the front guide plate The slideway 4 formed by the plate 2 and the rear guide plate 3 is symmetrically provided with a left mold 5 and a right mold 6 that slide toward or against each other along the slideway 4, and the upper ends of the left mold 5 and the right mold 6 are provided with an upper template 7, and the left mold 5 and the right mold 6 are slidingly connected with the upper template 7 through the wedge assembly 8, and the upper template 7 is connected with the mold handle hydraulic cylinder 10 for driving the upper template 7 to move up and down through the mold handle 9 , the front and rear ends of the left support plate 53 of the left mold 5 and the right support plate 63 of the right mold 6 are mutually driven and connected through the guide post guide sleeve assembly 11, wherein the guide sleeve 112 is interference fit with the left support plate 53 , where the guide post 111 is covered with a return spring 12 for driving the left mold 5 and the right mold 6 to slide, and the anastomotic portion of the left mold 5 and the right mold 6 is pierced with a solenoid coil assembly 13 that runs through the workbench 1 , the solenoid coil assembly 13 is covered with a pipe material 14 , and the solenoid coil assembly 13 is connected to a support hydraulic cylinder 17 via a support assembly 16 .

In the present invention, the left mold 5 includes a left mold core 51, the left mold core 51 is fixed in the groove of the C-shaped left mold frame 52, and a left support plate 53 is fixed on the outside of the left mold frame 52; The right mold 6 includes a right mold core 61, and the right mold core 61 is fixed in a groove of a C-shaped right mold frame 62, and a right support plate 63 is fixed on the outside of the right mold frame 62.

In the present invention, the left mold core 51 includes a left hemispherical cavity 512, and the right mold core 61 includes a right hemispherical cavity 612, and the two hemispherical inner cavities match each other to form a bulging shape by laminating the tube material 14. The inner edges of one or both ends of the hemispherical cavity 512 and the right hemispherical cavity 612 are arc-shaped for laminating the pipe material 14 to form flanges.

In the present invention, the wedge assembly 8 includes a left lower wedge 83 and a right lower wedge 84 respectively fixed on the outside of the left support plate 53 and the right support plate 63 via fastening screws, and the wedge assembly 8 also includes respectively The upper left wedge 81 and the upper right wedge 82 fixed on the left and right sides of the lower end surface of the upper formwork 7 by fastening screws, the lower left wedge 83 and the upper left wedge 81 are slidably matched, and the lower right wedge 84 is matched with the upper right wedge 84. Wedge 82 is a snug fit.

In the present invention, the supporting assembly 16 includes a flange 161 for supporting the solenoid coil assembly 13 , and also includes a transmission rod 162 connected to the output shaft of the supporting hydraulic cylinder 17 .

In the present invention, the solenoid coil assembly 13 includes a vertically arranged insulating frame 131, and the middle part of the insulating frame 131 is helically wound with a wire to form a solenoid coil 132. 132 is provided with a pipe material 14, the bottom of the insulating frame 131 is provided with a positioning sleeve 15 for supporting the pipe material 14, and the bottom end of the insulating frame 131 is provided with a coil positive terminal 133 and a coil negative terminal that pass through the flange 161. Connector 134.

In the present invention, the coil positive terminal 133 and the coil negative terminal 134 are connected in series with the discharge control switch via a capacitor bank, and the capacitor bank is connected in parallel with the power supply to form the magnetron circuit 18 .

In the present invention, the left mold core 51 is provided with a positioning wedge 511 at the joint with the right mold core 61, and the right mold core 61 is provided with a positioning wedge 511 at the joint with the left mold core 51. Matching positioning groove 611.

In the present invention, the mold handle hydraulic cylinder 10 and the oil circuit 19 supporting the hydraulic cylinder 17 are respectively connected to two electromagnetic control valves in the hydraulic control box, and the two electromagnetic control valves are connected to the console 20 through control lines.

In the present invention, a method for synchronous forming of electromagnetic bulging and flanging of alloy pipe fittings, providing each component of a device for simultaneous forming of electromagnetic bulging and flanging of alloy pipe fittings described in any one of the above, including the following steps:

(1) The contraction of the supporting hydraulic cylinder 17 drives the solenoid coil assembly 13 to move to the lowest position. At this time, the distance between the upper end surface of the solenoid coil assembly 13 and the lower end surface of the worktable 1 is greater than the length of the original pipe material 14, and the mold handle hydraulic cylinder 10 shrinks and drives the mold handle 9 and the upper template 7 to move to the highest position. During the upward movement of the upper template 7 along the wedge assembly 8, the left mold 5 and the right mold 6 move along the slideway 4 phases under the action of the return spring 12. Back sliding, the left mold kernel 51 and the right mold kernel 61 are separated;

(2) Put the tube material 14 outside the solenoid coil 132, and the lower end of the tube material 14 is in contact with the upper end of the positioning sleeve 15;

(3) The operation console 20 controls the hydraulic control box, controls the stretching of the support hydraulic cylinder 17 to drive the support assembly 16 to the working position, and the stretching of the mold handle hydraulic cylinder 10 drives the mold handle 9 and the upper template 7 to move downward. 7 During the movement of sliding downward along the wedge assembly 8, the left mold 5 and the right mold 6 slide towards each other along the slideway 4 under the action of the return spring 12, and the left mold core 51 and the right mold core 61 are closed;

(4) The console 20 controls the electromagnetic forming equipment to complete the charging of the capacitor bank, and then closes the discharge control switch, and the capacitor bank discharges the solenoid coil assembly 13. At this time, the two ends of the capacitor bank are connected in series with the solenoid coil 132 to form a low-resistance discharge circuit , the solenoid coil 132 generates a high-frequency oscillating instantaneous high current, and generates a pulsed strong magnetic field around the solenoid coil 132, thereby generating an eddy current in the tube material 14 and then generating an electromagnetic repulsion force to make the tube material 14 move outward, and the tube material 14 Material 14 fits the left mold core 51 and the right mold core 61 to form a bulging shape in the middle of the end flanging;

(5) The operation console 20 controls the hydraulic control box to complete step (1), and the bulging and flanging formed parts are taken out.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the present invention.

Claims (10)

1. a kind of alloy pipe fitting Electromagnetic bulging and flange synchronous forming device, including workbench it is characterised in that: described workbench On be fixedly installed forward and backward guide plate, be symmetrically arranged with the slideway that described forward and backward guide plate is formed along slideway towards or away from The left and right mould sliding, described left and right mould upper end is arranged with cope match-plate pattern, and described left and right mould is slided with cope match-plate pattern through wedge assemblies It is dynamically connected, described cope match-plate pattern is connected with the die shank hydraulic cylinder in order to drive cope match-plate pattern to move up and down through die shank, described left and right mould The rear and front end of left and right gripper shoe between all through the mutual driving coupling of guide pillar guide pin bushing assembly, be wherein arranged with guide pillar in order to Drive the back-moving spring that left and right mould slides, the anastomotic part of described left and right mould is equipped with the solenoid coil running through workbench Part, described solenoid coil assembly overcoat is provided with materials in the tube, and described solenoid coil assembly is through support component and supporting cylinder phase Connect.

2. a kind of alloy pipe fitting Electromagnetic bulging according to claim 1 and flange synchronous forming device it is characterised in that: institute State left mould and comprise left mould core, described left mould core is fixed in the groove of c shape left mould framework, and the outside of described left mould framework is fixed with Left support plate；Described right mould comprises right mould core, and described right mould core is fixed in the groove of c shape right mould framework, described right mould framework Outside be fixed with right support plate.

3. a kind of alloy pipe fitting Electromagnetic bulging according to claim 2 and flange synchronous forming device it is characterised in that: institute State left and right die and all comprise hemispherical cavity, two halves spherical inner chamber mutually coincide to fit in order to materials in the tube and forms bulging, described hemisphere In the one or both ends portion of shape inner chamber, all curved the laminating in order to materials in the tube in lateral margin forms flange.

4. a kind of alloy pipe fitting Electromagnetic bulging according to claim 3 and flange synchronous forming device it is characterised in that: institute State wedge assemblies and comprise to be separately fixed at lower-left voussoir outside left and right gripper shoe, bottom right voussoir, described wedge assemblies also comprise It is separately fixed at upper left voussoir, the upper right voussoir of cope match-plate pattern lower surface arranged on left and right sides, described lower-left voussoir is slided with upper left voussoir Cooperation, described bottom right voussoir and upper right voussoir are slidably matched.

5. a kind of alloy pipe fitting Electromagnetic bulging according to claim 4 and flange synchronous forming device it is characterised in that: Described support component comprises the ring flange in order to support solenoid coils assembly, also comprises to be connected with supporting cylinder output shaft Drive link.

6. a kind of alloy pipe fitting Electromagnetic bulging according to claim 5 and flange synchronous forming device it is characterised in that: institute State the Insulating frame that solenoid coil assembly comprises to be vertically arranged, described Insulating frame middle spiral is wound with wire to form spiral shell Spool coil, described Insulating frame is arranged with materials in the tube outside solenoid coil, and described Insulating frame bottom is arranged with to support The abutment sleeve of materials in the tube, described Insulating frame bottom is provided through coil electrode joint and the coil anode connector of ring flange.

7. a kind of alloy pipe fitting Electromagnetic bulging according to claim 6 and flange synchronous forming device it is characterised in that: institute State coil electrode joint and coil anode connector is connected with discharge control switch through capacitor bank, described capacitor bank is electric with power supply Source is in parallel.

8. a kind of alloy pipe fitting Electromagnetic bulging according to claim 7 and flange synchronous forming device it is characterised in that: institute State left mould core and the anastomosis with right mould core be provided with positioning voussoir, described right mould core the anastomosis with left mould core be provided with The detent that positioning voussoir matches.

9. a kind of alloy pipe fitting Electromagnetic bulging according to claim 8 and flange synchronous forming device it is characterised in that: institute State die shank hydraulic cylinder, the oil circuit of supporting cylinder is connected with two solenoid electric valves in hydraulic control box respectively, described two electricity Magnetic control valve is connected with control station through control line.

10. a kind of alloy pipe fitting Electromagnetic bulging and flange synchronous forming method are it is characterised in that provide a kind of such as claim 1- A kind of alloy pipe fitting Electromagnetic bulging described in 9 any one and each parts of flange synchronous forming device, comprise the following steps:

(1) supporting cylinder shrinks and drives solenoid coil assembly to move to extreme lower position, now solenoid coil assembly upper end The spacing of face and workbench lower surface is more than the length of original materials in the tube, and die shank hydraulic cylinder shrinks and drives die shank, cope match-plate pattern to move to Extreme higher position, in cope match-plate pattern is along the motor process of wedge assemblies upward sliding, left and right mould is slided in action of reset spring lower edge Road slides opposite to each other, and left and right die separates；

(2) materials in the tube are enclosed within outside the wire of Insulating frame, the lower end of described materials in the tube is contacted with abutment sleeve upper end；

(3) operating console controls hydraulic control box, controls supporting cylinder stretching to drive support component to move to operating position, Die shank hydraulic cylinder tension belt dynamic model handle, cope match-plate pattern move downward, cope match-plate pattern along wedge assemblies slide downward motor process In, left and right mould is in action of reset spring lower edge slideway slide in opposition, right mould core, left mould core closure；

(4) control station controls electro-magnetic forming equipment to complete capacitance group and charges, and then closes discharge control switch, capacitor bank is to spiral shell Spool coil block discharges, and at this moment connected with solenoid coil as low resistance discharge loop, solenoid coil in capacitor bank two ends The middle transient high-current producing the higher-order of oscillation, produces impulse magnetic field around solenoid coil, thus producing whirlpool in materials in the tube Flow to and produce electromagnetic repulsive force and so that materials in the tube is moved out, after the materials in the tube left and right die of laminating, form bulging in the middle of the flange of end Shape；

(5) operating console controls hydraulic control box to complete step (1), takes out bulging and flanging forming part.