Flat tube forming device and flat tube forming method

Abstract

The present invention discloses a flat tube forming device comprising a lower forming die, an upper forming die, a positioning rod, a guide rod, and a U-shaped forming block. The present invention also discloses a flat tube forming method. The present invention can press the ends of round tubes according to design standards, making the forming of the ends controllable and effectively improving product quality.

Description

Technical Field

[0001] The invention belongs to round tube processing technology, and particularly relates to a flat tube forming device and a flat tube forming method. Background Art

[0002] A punch press (stamping mechanism) converts circular motion from conventional punching into linear motion. The main motor generates power, driving a flywheel, which, through a clutch, drives gears, a crankshaft (or eccentric gear), and connecting rods to achieve linear motion of the slider. The motion from the main motor to the connecting rod is circular. A punch press applies pressure to the material, causing it to plastically deform and achieve the desired shape and precision. Therefore, it must be used with a set of dies (upper and lower dies) between which the material is placed. The machine applies pressure and deformation, and the reaction force caused by the force applied to the material during processing is absorbed by the punch press mechanism. Punching presses are widely used for stamping and forming components in electronics, communications, computers, home appliances, furniture, transportation, and hardware (automobiles, motorcycles, bicycles).

[0003] When using the existing round tube flattening process to press round tubes, problems such as poor forming and a large number of defective products often occur. When using conventional stamping dies for stamping, results consistent with the original design cannot be obtained. Summary of the Invention

[0004] The object of the present invention is to provide a flat tube forming device and a flat tube forming method thereof, which can press the end of a round tube according to design standards, make the forming of the end of the round tube controllable, and effectively improve product quality.

[0005] To achieve the above objectives, the technical solutions used in the present invention are:

[0006] The flat tube forming device includes: a forming lower die, a forming upper die, a positioning rod, a guide rod, and a U-shaped forming block; the forming lower die is provided with a lower die positioning hole and a lower die guide hole, the forming upper die is provided with an upper die positioning hole and an upper die guide hole, and the forming lower die is located at the lower part of the forming upper die; the lower part of the positioning rod is fixed in the lower die positioning hole, and the upper part is sleeved in the upper die positioning hole; the lower part of the guide rod is fixed in the lower die guide hole, and the upper part is sleeved in the upper die guide hole; the U-shaped forming block includes: a forming sliding block, a pressure block, a directional pin, a reset spring, and a sliding body; the sliding body is provided with a positioning rod through hole and a guide rod through hole, and the side wall is provided with a dovetail groove, the positioning rod is sleeved in the positioning rod through hole, and the guide rod is sleeved in the guide The rod is in the through hole; the inner side of the sliding body is wedge-shaped, and the outer side is an arc-shaped surface. A first sliding key is provided on the wedge surface, and a second sliding key is provided on the end surface; the two formed sliding blocks are arranged horizontally and the inner sides are opposite to each other, and the second sliding key is inserted in the dovetail groove on the side wall of the sliding body; the pressure block is provided with sliding grooves on two inclined surfaces and a directional through hole in the middle. The two pressure blocks are arranged longitudinally, and the two side surfaces and inclined surfaces of the pressure block are pressed on the wedge surface of the formed sliding block, and the first sliding key is installed in the sliding groove; one end of the directional pin is fixed in the directional through hole of one pressure block, and the other end is sleeved in the directional through hole of the other pressure block; the return spring is sleeved on the directional pin and is located between the two pressure blocks.

[0007] Furthermore, the upper die positioning hole and the upper die guide hole are countersunk holes, and the openings are located at the bottom surface of the forming upper die; the lower die positioning hole and the lower die guide hole are through holes.

[0008] Furthermore, a stepped hole is provided on the upper portion of the lower die positioning hole, a return spring is provided in the stepped hole, the return spring is sleeved on the positioning rod, and the upper portion of the return spring rests against the lower portion of the sliding body.

[0009] Furthermore, a lower die inclined pressure surface is provided on the top side of the forming lower die, and an upper die inclined pressure surface is provided on the bottom side of the forming upper die, and the upper die inclined pressure surface is opposite to the lower die inclined pressure surface.

[0010] Furthermore, the lower die positioning hole and the lower die guide hole are through holes, the inner walls of which are provided with internal threads, and the positioning rod and the guide rod are connected to the lower die positioning hole and the lower die guide hole through threads.

[0011] Furthermore, a connecting block is provided on the top of the forming upper die, and the top and bottom surfaces of the sliding body are mutually flat; the pressure block is in the shape of a trapezoidal column, and the two side surfaces of the pressure block fit with the wedge surface of the forming sliding block.

[0012] Furthermore, the second sliding key is a dovetail key.

[0013] Furthermore, a forming sliding block return spring is connected between the two forming sliding blocks.

[0014] A flat tube forming method, comprising:

[0015] After the flat tube forming device is connected to the punching mechanism, the forming sliding block and pressure block of the U-shaped forming block are inserted into the end of the round tube; the slider of the punching mechanism drives the forming upper die to move downward, and the position of the round tube near the end is squeezed by the inclined pressure surfaces of the lower die and the upper die, forming an inclined surface;

[0016] The upper and lower inner walls at the end of the round tube squeeze the pressure blocks, and the inclined surfaces of the two pressure blocks squeeze the wedge-shaped surfaces of the forming sliding blocks. The two forming sliding blocks move to both sides, and the arc-shaped surfaces of the forming sliding blocks push the inner walls at the end of the round tube horizontally, so that both sides of the round tube maintain the arc shape;

[0017] After the pipe is pressed, the workpiece is removed, and the reset spring in the U-shaped forming block resets the pressure block, and the return spring pushes the sliding body to reset the U-shaped forming block.

[0018] Preferably, the forming sliding block reset spring pulls the two forming sliding blocks to move inward and reset.

[0019] The technical effects of the present invention include:

[0020] The present invention is used in conjunction with a stamping machine bed to press the ends of round tubes according to design standards, making the forming of the ends of round tubes controllable and achieving one-time pressing of different shapes of the ends, effectively improving product quality and greatly improving processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the flat tube forming device in the present invention;

[0022] Figure 2 Schematic diagram of the cross-sectional structure of the flat tube forming device of the present invention;

[0023] Figure 3 It is a structural schematic diagram of the lower forming die in the present invention;

[0024] Figure 4 It is a structural schematic diagram of the U-shaped forming block in the present invention;

[0025] Figure 5 It is a schematic diagram of the longitudinal section structure of the U-shaped forming block in the present invention;

[0026] Figure 6 This is a structural exploded view of the U-shaped forming block in the present invention;

[0027] Figure 7 It is a structural schematic diagram of the formed sliding block in the present invention;

[0028] Figure 8 It is a structural schematic diagram of the pressure block in the present invention. DETAILED DESCRIPTION

[0029] The following description sufficiently illustrates specific embodiments of the invention to enable those skilled in the art to practice and reproduce the invention.

[0030] like Figure 1 As shown, it is a structural schematic diagram of the flat tube forming device in the present invention; Figure 2 FIG. 1 is a schematic diagram of the cross-sectional structure of the flat tube forming device of the present invention.

[0031] The flat tube forming device comprises: a forming lower die 1, a forming upper die 2, a positioning rod 3, a guide rod 4, and a U-shaped forming block 5. The positioning rod 3 and the guide rod 4 are arranged between the forming lower die 1 and the forming upper die 2. The U-shaped forming block 5 is movably connected to the positioning rod 3 and the guide rod 4 and is located between the forming lower die 1 and the forming upper die 2.

[0032] like Figure 3 , which is a schematic structural diagram of the lower forming die 1 in the present invention.

[0033] The forming lower die 1 is provided with a lower die positioning hole 11, a lower die guide hole 12, and a stepped hole 13. The stepped hole 13 is in communication with the lower die positioning hole 11 and is located above the lower die positioning hole 11. A lower die inclined pressure surface 14 is provided on the side of the top surface of the forming lower die 1. In this preferred embodiment, the lower die positioning hole 11 and the lower die guide hole 12 are through holes, and the openings are located on the top and bottom surfaces of the forming lower die 1. Of course, the lower die positioning hole 11 and the lower die guide hole 12 can also be through holes, with internal threads provided on the inner walls, and the positioning rod 3 and the guide rod 4 are connected to the lower die positioning hole 11 and the lower die guide hole 12 by threads.

[0034] The upper die 2 is provided with an upper die positioning hole 21 and an upper die guide hole 22. These are countersunk holes with openings located on the bottom surface of the upper die 2. An upper die inclined pressure surface 23 is provided on the side of the bottom surface of the upper die 2. The upper die inclined pressure surface 23 is located opposite the lower die inclined pressure surface 14 and is located above the lower die inclined pressure surface 14. A connecting block 24 is provided on the top of the upper die 2 for connecting to the press bed.

[0035] The lower part of the positioning rod 3 is fixed in the lower die positioning hole 11, and the upper part is sleeved in the upper die positioning hole 21; the lower part of the guide rod 4 is fixed in the lower die guide hole 12, and the upper part is sleeved in the upper die guide hole 22; a return spring 6 is provided in the step hole 13, and the return spring 6 is sleeved on the positioning rod 3. The upper part of the return spring 6 rests on the lower part of the sliding body 55 of the U-shaped forming block 5, and is used to push the U-shaped forming block 5 to return to its unloaded position.

[0036] like Figure 4 As shown, it is a schematic structural diagram of the U-shaped forming block 5 in the present invention; Figure 5 As shown, it is a schematic diagram of the longitudinal section structure of the U-shaped forming block 5 in the present invention; Figure 6, which is a structural exploded view of the U-shaped forming block 5 in the present invention.

[0037] The U-shaped forming block 5 can be designed in different sizes to adapt to different pipe diameters. If the pipe diameter does not change much, only the forming sliding block 51 can be replaced.

[0038] The U-shaped forming block 5 includes a forming sliding block 51 , a pressure block 52 , a directional pin 53 , a return spring 54 , and a sliding body 55 .

[0039] The sliding body 55 is provided with a positioning rod through hole 551 and a guide rod through hole 552 , and a dovetail groove 553 is provided on the side wall; the positioning rod 3 is sleeved in the positioning rod through hole 551 , and the guide rod 4 is sleeved in the guide rod through hole 552 .

[0040] like Figure 7 FIG. 1 is a schematic structural diagram of the forming sliding block 51 of the present invention.

[0041] The inner side of the molded sliding block 51 is wedge-shaped, the outer side is curved, and the top and bottom surfaces are mutually flat. The wedge-shaped surface is provided with a first sliding key 511, and the end surface is provided with a second sliding key 512, which is a dovetail key. The inner sides (wedge-shaped sides) of the two molded sliding blocks 51 face each other, and the second sliding key 512 is inserted into the dovetail groove 553 on the side wall of the sliding body 55.

[0042] like Figure 8 FIG. 1 is a schematic structural diagram of the pressure block 52 of the present invention.

[0043] The pressure block 52 is in the shape of a trapezoidal cylinder, with sliding grooves 521 provided on two inclined surfaces and a directional through hole 522 provided in the middle; the two pressure blocks 52 are arranged up and down and positioned opposite to each other, the two inclined surfaces of the pressure block 52 are pressed on the wedge surface of the forming sliding block 51, the first sliding key 511 is installed in the sliding groove 521, the two pressure blocks 52 are close to each other longitudinally, the two inclined surfaces of the pressure block 52 squeeze the wedge surface of the forming sliding block 51, and the two forming sliding blocks 51 can slide to both sides under the downward pressure of the pressure block 52; one end of the directional pin 53 is fixed in the directional through hole 522 of one pressure block 52, and the other end is sleeved in the directional through hole 522 of the other pressure block 52.

[0044] A return spring 54 is mounted on the directional pin 53 and positioned between the two pressure blocks 52. After the tube ends are stamped, the return spring 54 separates the two pressure blocks 52. Alternatively, a return spring for the forming slide block 51 can be connected between the two forming slide blocks 51. As the two pressure blocks 52 return to their original positions, the return spring pulls the two forming slide blocks 51 back into their original positions.

[0045] The flat tube forming method specifically comprises the following steps:

[0046] Step 1: After the flat tube forming device is connected to the stamping mechanism, the forming sliding block 51 and the pressure block 52 of the U-shaped forming block 5 are inserted into the end of the round tube;

[0047] Step 2: The slider of the stamping mechanism drives the forming upper die 2 to move downward, and the round tube near the end is squeezed by the lower die inclined pressure surface 14 and the upper die inclined pressure surface 23 to deform and form an inclined surface;

[0048] Step 3: The upper and lower inner walls of the end of the circular tube are squeezed by the pressure blocks 52. The inclined surfaces of the two pressure blocks 52 squeeze the wedge-shaped surfaces of the forming sliding blocks 51. The two forming sliding blocks 51 are opened outward. The arc-shaped surfaces of the forming sliding blocks 51 push the inner walls of the end of the circular tube on the left and right sides, so that the two sides of the end of the circular tube maintain the arc shape.

[0049] Step 4: After the pipe is pressed and the workpiece is removed, the return spring 54 in the U-shaped forming block 5 resets the pressure block 52, and the return spring 6 pushes the sliding body 55, so that the U-shaped forming block 5 also returns to its original position.

[0050] The terms used in this invention are descriptive and exemplary, rather than restrictive. Since the present invention can be embodied in a variety of forms without departing from the spirit or essence of the technical solution, it should be understood that the above-described embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope of the appended claims. Therefore, all changes and modifications that fall within the scope of the claims or their equivalents are intended to be covered by the appended claims.

Claims

1. A flat tube forming device, characterized in that: include: The forming lower die, the forming upper die, the positioning rod, the guide rod and the U-shaped forming block; the forming lower die is provided with a lower die positioning hole and a lower die guide hole, the forming upper die is provided with an upper die positioning hole and an upper die guide hole, the forming lower die is located at the lower part of the forming upper die, the top side of the forming lower die is provided with a lower die inclined pressure surface, the forming upper die is provided with an upper die inclined pressure surface on the bottom side, and the upper die inclined pressure surface is relative to the lower die inclined pressure surface; the lower part of the positioning rod is fixed in the lower die positioning hole, and the upper part is sleeved in the upper die positioning hole; the lower part of the guide rod is fixed in the lower die guide hole, and the upper part is sleeved in the upper die guide hole; the U-shaped forming block includes: a forming sliding block, a pressure block, a directional pin, a reset spring and a sliding body; the sliding body is provided with a positioning rod through hole and a guide rod through hole, and the side wall is provided with a dovetail groove, the positioning rod is sleeved in the positioning rod through hole, and the guide rod sleeve Installed in the through hole of the guide rod; the inner side of the formed sliding block is a wedge-shaped surface, and the outer side is an arcuate surface, the wedge surface is provided with a first sliding key, the end surface is provided with a second sliding key, and the second sliding key is a dovetail key; the two formed sliding blocks are arranged horizontally and the inner sides are opposite to each other, and a formed sliding block reset spring is connected between the two formed sliding blocks, and the second sliding key is inserted into the dovetail groove on the side wall of the sliding body; the pressure block is provided with sliding grooves on two inclined surfaces and a directional through hole in the middle, and the two pressure blocks are arranged longitudinally, and the two side surfaces and inclined surfaces of the pressure block are pressed on the wedge surface of the formed sliding block, and the first sliding key is installed in the sliding groove; one end of the directional pin is fixed in the directional through hole of one pressure block, and the other end is sleeved in the directional through hole of the other pressure block; the reset spring is sleeved on the directional pin and is located between the two pressure blocks.

2. The flat tube forming device according to claim 1, characterized in that: The upper die positioning hole and the upper die guide hole are countersunk holes, and the openings are located on the bottom surface of the forming upper die; the lower die positioning hole and the lower die guide hole are through holes.

3. The flat tube forming device according to claim 1, characterized in that: A step hole is provided on the upper part of the lower die positioning hole, a return spring is provided in the step hole, the return spring is sleeved on the positioning rod, and the upper part of the return spring is against the lower part of the sliding body.

4. The flat tube forming device according to claim 2, characterized in that: The inner walls of the lower die positioning hole and the lower die guide hole are provided with internal threads, and the positioning rod and the guide rod are connected in the lower die positioning hole and the lower die guide hole through threads.

5. The flat tube forming device according to claim 1, characterized in that: A connecting block is set on the top of the forming upper die, and the top and bottom surfaces of the sliding body are flat; the pressure block is in the shape of a trapezoidal column, and the two side surfaces of the pressure block fit with the wedge surface of the forming sliding block.

6. A flat tube forming method using the flat tube forming device according to any one of claims 1 to 5, characterized in that: include: After the flat tube forming device is connected to the punching mechanism, the forming sliding block and pressure block of the U-shaped forming block are inserted into the end of the round tube; the slider of the punching mechanism drives the forming upper die to move downward, and the position of the round tube near the end is squeezed by the inclined pressure surfaces of the lower die and the upper die, forming an inclined surface; The upper and lower inner walls at the end of the round tube squeeze the pressure blocks, and the inclined surfaces of the two pressure blocks squeeze the wedge-shaped surfaces of the forming sliding blocks. The two forming sliding blocks move to both sides, and the arc-shaped surfaces of the forming sliding blocks push the inner walls at the end of the round tube horizontally, so that both sides of the round tube maintain the arc shape; After the pipe is pressed, the workpiece is removed, and the reset spring in the U-shaped forming block resets the pressure block, and the return spring pushes the sliding body to reset the U-shaped forming block.

7. The flat tube forming method according to claim 6, characterized in that: The forming sliding block reset spring pulls the two forming sliding blocks to move inward and reset.

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