CN115488196B - Stamping device for thin-wall metal pipe - Google Patents

Abstract

A stamping device for thin-walled metal pipes. The bending parts and the pressure-bearing parts are connected in series and placed into the metal pipe as linings to support and assist the metal pipe in deforming under pressure. The bending piece is composed of a pair of internal screws that are coaxial with the sector axis and can rotate around the sector axis. They can rotate forward or reverse to move closer to each other. They can then be placed in the depressions and protrusions of the deformation, and are convenient for use after deformation. Pull out from the metal tube. By using pressure-bearing parts made of thermoplastic materials, the pressure-bearing parts have a certain compressive hardness at room temperature, and can soften after being heated to facilitate extraction from the metal pipe. It has a simple structure and is easy to use. The pressure-bearing parts can be reused after being reshaped, and the inner lining can be formed in series according to needs. It has strong practicability and wide applicability.

Description

A stamping device for thin-walled metal pipes

Technical field

The invention relates to a stamping device, in particular to a stamping device for thin-walled metal pipes.

Background technique

Stamping is a forming processing method that relies on presses and molds to apply external force to plates, strips, pipes and profiles to cause plastic deformation or separation, thereby obtaining workpieces (stamping parts) of the required shape and size.

Stamping and forging both belong to plastic processing (or pressure processing), and are collectively called forging. The blanks for stamping are mainly hot-rolled and cold-rolled steel plates and strips. There are also a large number of stamped parts in products such as instruments and meters, household appliances, bicycles, office machinery, and living utensils.

For thin-walled metal pipes, during the process of deformation caused by conventional stamping devices, the thin wall is prone to excessive deformation due to excessive and too fast force, thereby causing defects.

Therefore, there is a need for a stamping device suitable for thin-walled metal pipes.

Contents of the invention

In order to solve the deficiencies of the prior art, the object of the present invention is to provide a stamping device for thin-walled metal pipes.

In order to achieve the above goals, the present invention adopts the following technical solutions:

A stamping device for thin-walled metal pipes, including a matching upper mold, a lower mold and an inner lining located in the metal pipe;

The inner cavity of the upper and lower molds is matched with the deformed metal tube;

The lining includes a bending member and a pressure-bearing member. The bending member includes a sector shaft provided with a central rotation axis and a pair of internal screws that are coaxial with the sector shaft and rotate around the sector axis based on the central rotation axis; The outer end is provided with an external thread, which is used to screw the end of the pressure-bearing part and connect several pressure-bearing parts in series; and, the sector-shaped axis of the bent part is placed at the deformation point of the metal pipe, and the pressure-bearing part is placed at the straight pipe;

The pressure-bearing part is made of thermoplastic material, and has a built-in heating component along the length direction; the heating component passes through the main conductive sheet provided on both end surfaces of the pressure-bearing member and the auxiliary conductive sheet provided on both end surfaces of the bending member. The conductive circuit connecting the auxiliary conductive sheets on both ends of the bending member supplies power; when the bending member and the pressure-bearing member are in a screw-connected state, the main conductive sheet and the auxiliary conductive sheet are connected.

The intermediate shaft of the above-mentioned sector shaft is made of magnetic material;

On the protruding ends of the upper mold and the lower mold, there are magnetic blocks that are magnetically attracted to the middle rotating shaft.

The longitudinal section of the above-mentioned internal screw is a right-angled trapezoid; along the horizontal direction, the angle connecting the right-angled trapezoid and the intermediate shaft is an acute angle, and a pair of internal screws are arranged symmetrically with respect to the center line of the sector shaft.

The above-mentioned upper mold is driven and pressed down by the control device through a hydraulic rod.

Furthermore, the bottom surface of the above-mentioned lower mold is provided with a pressure sensor, and the control device opens and closes the hydraulic rod based on feedback from the pressure sensor.

The above-mentioned pressure-bearing parts have built-in temperature sensors and are connected to the control device through conductive circuits;

The control device turns the heating element on and off based on feedback from the temperature sensor.

The above-mentioned heating component is made of a flexible and flexible material.

The above-mentioned thermoplastic materials include polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyoxymethylene, polycarbonate, polyamide, acrylic plastics, other polyolefins and their copolymers, polysulfone, polyphenylene ether, chlorinated polyethylene ether.

Furthermore, the above-mentioned sector shaft and internal screw are made of hard metal, including iron and stainless steel.

The benefits of the present invention are:

A stamping device for thin-walled metal pipes. The bending parts and the pressure-bearing parts are connected in series and placed into the metal pipe as linings to support the pressure deformation of the metal pipe from the inside. The bending piece is composed of a pair of internal screws that are coaxial with the sector axis and can rotate around the sector axis. They can rotate forward or reverse to move closer to each other, and can be placed in the depressions and protrusions of the deformation, and are convenient for deformation. Pull out from the metal tube. By using thermoplastic material for pressure-bearing parts, the pressure-bearing parts have a certain compression hardness at room temperature, and can soften after being heated to facilitate extraction from the metal pipe.

The stamping device for thin-walled metal pipes of the present invention has a simple structure and is easy to use. The pressure-bearing parts can be reused after being reshaped, and the inner lining can be formed in series according to needs. It has strong practicability and wide applicability. .

Description of the drawings

Figure 1 is a schematic structural diagram of a stamping device for thin-walled metal pipes.

Figure 2 is a schematic structural diagram of the bending part and the pressure-bearing part being screwed in sequence.

Figure 3 is a schematic structural diagram of the secondary conductive sheet.

Figure 4 is a schematic structural diagram of the main conductor sheet.

The meanings of the marks in the drawings are as follows: 1. Hydraulic rod, 2. Upper mold, 3. Lower mold, 4. Magnetic block, 5. Middle rotating shaft, 6. Sector shaft, 7. Internal screw, 8. Pressure-bearing parts, 9 , auxiliary conductive sheet, 10. main conductive sheet, 11. heating component.

Detailed ways

The present invention will be specifically introduced below with reference to the accompanying drawings and specific embodiments.

A stamping device for thin-walled metal pipes consists of a matching upper mold 2, a lower mold 3 and an inner lining located in the metal pipe.

In the mold closing state, the inner cavity between the upper mold 2 and the lower mold 3 matches the metal tube deformed by stamping.

The inner lining is composed of a bending part and a pressure-bearing part 8; the bending part is composed of a sector shaft 6 and a pair of internal screws 7. An intermediate shaft 5 is provided at the center of the sector shaft 6. The longitudinal section of the internal screw 7 is in the shape of a right-angled trapezoid. The surface and bottom are provided with external threads, the outer end is a vertical surface, the inner end is a bevel, and the acute end of the inner end is sleeved with the intermediate shaft 5 and rotates around the sector axis 6 based on the intermediate shaft 5; a pair of internal screws 7 are based on the intermediate shaft 5 The setup mirrors each other, as shown in Figure 3.

The external thread of the internal screw 7 is used to screw into the thread groove at the end of the pressure-bearing part 8 . As shown in Figure 2, several bending parts and pressure-bearing parts 8 are screwed end to end; after matching with the stamped metal pipe, the sector-shaped shaft 6 of the bending part is placed at the deformation point of the metal pipe for end corner pressure bearing; The pressing piece 8 is placed at the straight pipe to maintain the pipe shape.

Along the length direction, the pressure-bearing member 8 has a built-in heating component 11 , and a main conductor 10 connected to the heating component 11 is provided in the threaded groove at the end of the pressure-bearing member 8 . The end surface of the inner screw 7 is provided with an auxiliary conductive sheet 9 that is connected to the main conductive sheet 10. The bending member is provided with a conductive circuit that connects the auxiliary conductive sheets 9 on both ends. The power supply is connected to the main conductive sheet 10 and the auxiliary conductive sheet in series. 9 and the conductive circuit power the heating element 11.

The material of the pressure-bearing part 8 is preferably a thermoplastic material, including polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyformaldehyde, polycarbonate, polyamide, acrylic plastics, other polyolefins and their copolymers, and polysulfone. , polyphenylene ether, chlorinated polyether.

The material of the heating component 11 is preferably a flexible and flexible material, including copper.

The material of the sector shaft 6 and the internal screw 7 is preferably hard metal, including iron and stainless steel.

The material of the intermediate shaft 5 of the sector shaft 6 is preferably a magnetic material; and at the protruding ends of the upper mold 2 and the lower mold 3, there are magnetic blocks 4 that are magnetically attracted to the intermediate shaft 5.

The upper mold 2 is driven and pressed down by the control device through the hydraulic rod 1. The bottom surface of the lower mold 3 is provided with a pressure sensor, and the control device opens and closes the hydraulic rod 1 based on feedback from the pressure sensor. The pressure-bearing part 8 has a built-in temperature sensor connected to the control device through a conductive circuit. The control device turns on and off the heating component 11 based on feedback from the temperature sensor or through power supply.

In actual use,

According to the metal pipe deformed by stamping, a pressure-bearing part 8 of appropriate length and a number of bent parts are selected and connected in series to form an inner lining, and then placed in the straight metal pipe.

Place the metal pipe with built-in lining on the top of the lower mold 3, and the control device drives the upper mold 2 to press down.

The bottom end of the upper mold 2 is in contact with the top of the metal pipe, and the magnet block 4 at the bottom end of the upper mold 2 and the magnetic central rotating shaft 5 of the bending member in the metal pipe are magnetically attracted to each other to form positioning.

The upper mold 2 continues to be pressed down, and the metal pipe bends and deforms along the cavity of the lower mold 3 to the structure shown in Figure 1. During the deformation process, the internal screw 7 of the bending part rotates around the central rotating shaft 5, and the exposed sector shaft 6 plays a supporting role in the bending part. The pressure-bearing member 8 connected to the internal screw 7 plays a pressure-bearing and supporting role in the straight pipe section.

After the stamping is completed, the control device drives the power supply to heat the pressure-bearing part 8 through the heating assembly 11. The pressure-bearing part 8 is made of thermoplastic material, which softens after being heated and releases the hard state; the lining is pulled out from either end of the deformed metal tube. That’s it. A pair of internal screws 7 of the bending member pass through the sector shaft 6 and can rotate clockwise to move closer to each other, or rotate counterclockwise to move closer to each other. Therefore, the bending member in the middle recess can pass through the protrusion at the end through reverse rotation, and smoothly of extraction.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the above embodiments do not limit the present invention in any way, and any technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims (9)

1. The stamping device for the thin-wall metal pipe is characterized by comprising an upper die, a lower die and a lining arranged in the metal pipe, wherein the upper die and the lower die are matched;

the inner cavities of the upper die and the lower die are matched with the deformed metal tube;

the lining comprises a bending piece and a pressure bearing piece, wherein the bending piece comprises a sector shaft provided with a middle rotating shaft and a pair of inner screw rods which are coaxial with the sector shaft and rotate around the sector shaft based on the middle rotating shaft; the outer side end of the inner screw is provided with an external thread for being in threaded connection with the end part of the pressure bearing piece and is sequentially connected with a plurality of pressure bearing pieces in series; the fan-shaped shaft of the bending piece is arranged at the deformation position of the metal pipe, and the pressure-bearing piece is arranged at the straight pipe;

the pressure bearing piece is made of thermoplastic materials, and a heating component is arranged in the longitudinal direction; the heating component is powered by a conductive circuit comprising a main conductive sheet arranged on two end surfaces of the pressure bearing piece, a secondary conductive sheet arranged on two end surfaces of the bending piece and a secondary conductive sheet arranged in the bending piece and connected with the two end surfaces;

when the bending piece and the pressure-bearing piece are in a screwed state, the main conductive piece and the auxiliary conductive piece are connected.

2. The stamping device of claim 1, wherein the hub of the fan shaft is magnetic;

the protruding ends of the upper die and the lower die are provided with magnetic blocks which are magnetically attracted with the middle shaft.

3. The stamping device of claim 1, wherein the longitudinal cross-section of the inner screw is right trapezoid; the angle at which the right trapezoid is connected with the transfer shaft is an acute angle along the horizontal direction, and the pair of inner screws are symmetrically arranged relative to the center line of the fan-shaped shaft.

4. The stamping device of claim 1, wherein the upper die is depressed by a control device via a hydraulic lever.

5. The stamping device of claim 4, wherein the bottom surface of the lower die is provided with a pressure sensor, and the control device opens and closes the hydraulic rod according to feedback of the pressure sensor.

6. The stamping device of claim 1, wherein the pressure-bearing member is provided with a temperature sensor inside and is connected with the control device through a conductive circuit;

the control device opens and closes the heating component according to the feedback of the temperature sensor.

7. The stamping device of claim 1, wherein the heating element is a pliable material.

8. The stamping device of claim 1, wherein the thermoplastic material comprises polyethylene, polypropylene, polyvinylchloride, polystyrene, polyoxymethylene, polycarbonate, polyamide, acrylic, polysulfone, polyphenylene oxide, or chlorinated polyether.

9. The stamping device of claim 7, wherein the fan shaft and the inner screw are made of hard metal.