A controllable and easily demouldable forming die for pipe processing and its forming method

Abstract

The present invention discloses a controllable and easy-to-demold forming die for pipe processing, belonging to the technical field of dies, including an upper die and a lower die, with the upper die located directly above the lower die. It is characterized in that: a carrier plate is fixedly arranged at the middle position of the upper part of the lower die, a fixed template is arranged above the middle position of the carrier plate, a mandrel is arranged above the fixed template, the fixed template is slidably connected with the mandrel, a push-pull block is arranged at the left end of the mandrel, the mandrel is clamped with the push-pull block, a fixed wedge is vertically and fixedly arranged at the clamping position of the mandrel and the push-pull block, lower sliding plates are symmetrically and slidably arranged on both sides of the mandrel on the upper part of the carrier plate, upper sliding plates are slidably arranged on the upper parts of the lower sliding plates, first pressing blocks are symmetrically and fixedly arranged on both sides of the lower part of the upper die, second pressing blocks are symmetrically and fixedly arranged on both sides of the lower part of the upper die and on both sides of the first pressing blocks, and a central pressing plate is fixedly arranged at the middle position of the lower part of the upper die. The present invention effectively ensures the smooth forming of the pipe and the forming precision, enables the mandrel to be smoothly demolded without overcoming huge resistance, and effectively enhances the applicability at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of molds, and specifically to a controllable and easily demoldable forming mold for pipe processing and a forming method thereof. Background Art

[0002] Pipes bent symmetrically on both sides are commonly used structures in the production process of swivel chairs. The main forming method is to place a mandrel in the middle of the preliminarily bent raw material, and then first laterally bend and then downwardly extrude and form through a pressing plate. Although the internal support of the mandrel and the external shaping of the pressing plate can achieve good forming effects, the pipe is closely attached to the mandrel after forming. When using the traditional demolding method, that is, directly pulling the mandrel outwards through a cylinder, the mandrel needs to overcome huge resistance, which makes the demolding process of the mandrel very inconvenient. In addition, a set of molds can only process one type of pipe, and the applicability is poor. Based on this situation, how to enable the mandrel to be smoothly demolded without overcoming huge resistance after the pipe bent symmetrically on both sides is formed, and at the same time enhance the applicability of the mold has increasingly become an urgent problem for relevant technical personnel to solve. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a controllable and easily demoldable forming mold for pipe processing and a forming method thereof.

[0004] A controllable and easily demoldable forming mold for pipe processing, comprising an upper mold and a lower mold, the upper mold is located directly above the lower mold, and is characterized in that: a carrier plate is fixedly arranged at the middle position of the upper part of the lower mold, a fixed template is arranged above the middle position of the carrier plate, a mandrel is arranged above the fixed template, the fixed template is slidably connected with the mandrel, a push-pull block is arranged at the left end of the mandrel, the mandrel is clamped with the push-pull block, a fixed wedge is vertically fixedly arranged at the clamping position of the mandrel and the push-pull block, lower sliding plates are symmetrically and slidably arranged on both sides of the mandrel at the upper part of the carrier plate, upper sliding plates are slidably arranged on the upper parts of the lower sliding plates, first pressing blocks are symmetrically fixedly arranged on both sides of the lower part of the upper mold, second pressing blocks are symmetrically fixedly arranged on both sides of the lower part of the upper mold and on both sides of the first pressing blocks, a central pressing plate is fixedly arranged at the middle position of the lower part of the upper mold, a limiting block is fixedly arranged at the middle position of the upper part of the lower mold and on the right side of the carrier plate, fixing seats are symmetrically fixedly arranged on both sides of the upper part of the lower mold and on both sides of the carrier plate, limiting plates are fixedly arranged above the upper sliding plates and above the fixing seats, limiting holes are respectively arranged through the corresponding positions of the limiting plates and the first pressing blocks and the second pressing blocks, pressing protrusions are respectively arranged on the lower parts of the upper sliding plates at the adjacent sides, and adjusting plates are respectively arranged on the upper parts of the limiting plates at the remote sides.

[0005] Further, a first downward pressing portion is provided at the lower part of the first pressing block, a second downward pressing portion is provided at the lower part of the second pressing block, a first bearing portion is provided at the middle position of the upper part of the side far from the sliding plate, and second bearing portions are symmetrically provided on both sides of the upper part of the side far from the upper sliding plate. The position of the first bearing portion corresponds to that of the first downward pressing portion, the position of the second bearing portion corresponds to that of the second downward pressing portion, the contact between the first downward pressing portion and the first bearing portion is completed prior to the start of the contact between the second downward pressing portion and the second bearing portion, and through grooves are vertically and penetratingly provided at the corresponding positions of the upper sliding plate and the first pressing block and at the corresponding positions of the lower sliding plate and the second pressing block.

[0006] Further, guide posts are symmetrically and fixedly provided on both sides of the upper part of the carrier plate. Upper guide grooves are vertically penetrated at the corresponding positions of the upper sliding plate and the guide posts, and lower guide grooves are vertically penetrated at the corresponding positions of the lower sliding plate and the guide posts. The directions of the upper guide grooves and the lower guide grooves are both in the front-back direction.

[0007] Further, the thickness of the fixed template gradually increases from the end close to the push-pull block to the end far from the push-pull block. A sliding connection portion is provided at the middle position of the upper part of the fixed template. The sliding connection portion is sequentially provided with a low inclination portion, a locking groove, and a high inclination portion from the end close to the push-pull block to the end far from the push-pull block. A locking block is provided above the locking groove. The locking block is clamped with the core rod. When the upper die and the lower die are closed, the locking block and the locking groove are locked by friction.

[0008] Further, inner guide seats are fixedly provided at the middle positions of the upper parts of the lower die and on the left side of the carrier plate. Inner guide grooves are horizontally penetrated at the middle positions of the inner guide seats. An outer guide seat is fixedly provided at the middle position of the upper part of the lower die and to the left of the inner guide seat. An outer guide groove is horizontally penetrated at the middle position of the outer guide seat. The push-pull block is slidably connected to both the inner guide groove and the outer guide groove.

[0009] Further, a cross bar is horizontally and fixedly provided at the middle position of the push-pull block. Outer driving plates are symmetrically and fixedly provided on the left side of the lower part of the upper die. An inward receiving portion is provided at the lower part of the outer driving plate. The cross-sectional shape of the inward receiving portion is a right triangle. An inner driving plate is fixedly provided at the lower part of the upper die and to the right of the outer driving plate. An outward protruding portion is provided at the lower part of the inner driving plate. The cross-sectional shape of the outward protruding portion is an isosceles trapezoid. Both the outer driving plate and the inner driving plate are slidably connected to the cross bar.

[0010] Further, a mounting plate is fixedly provided at the middle position of the left end of the lower die, and a cylinder is fixedly provided on the right side of the mounting plate. The output end of the cylinder is fixedly connected to the push-pull block.

[0011] Further, a forming method of a controllable and easily demoldable forming die for pipe processing is as follows:

[0012] (1) In the initial state, the upper die is separated from the lower die. A suitable adjustment plate is selected according to the pipe processing requirements, and the adjustment plate is fixed to the corresponding position on the upper part of the limit plate. The preliminarily bent raw material is placed on the upper part of the carrier plate and the lower part of the fixed die plate. The push-pull block is pushed to the predetermined position by the cylinder to move the upper die vertically downward;

[0013] (2) The lower part of the outer convex part pushes the cross bar, so that the push-pull block and the core rod move to the left synchronously with the cross bar, and the locking block pushes the low-inclined part, so that the fixed template drives the raw material to move to the left, until the raw material moves between the inner guide seat and the limit block and touches both of them;

[0014] (3) The retracted part and the upper part of the convex part cooperate to push the crossbar, so that the push-pull block and the core rod move right synchronously with the crossbar until the locking block touches the high-inclined part. At this time, the core rod fits tightly with the fixed template, and the locking block and the locking groove are locked by friction;

[0015] (4) The fixed seat and the limit plate limit the first pressing block, the first lower pressing part contacts the first pressure-bearing part, and the lower slide plates are pushed closer to each other. The adjacent side of the lower slide plates bends the raw material in the vertical direction, and the guide column cooperates with the lower guide groove to keep the required accuracy during the movement of the lower slide plate;

[0016] (5) The fixed seat and the limit plate limit the second pressing block, the second lower pressing part contacts the second pressure-bearing part, and the upper slide plates are pushed closer to each other. The adjacent side of the upper slide plates bends the raw material in the horizontal direction. The guide column cooperates with the upper guide groove to keep the required accuracy during the movement of the upper slide plate.

[0017] (6) The center pressing plate passes through the gap of the limiting plate and presses down the upper sliding plate until the pressing protrusion presses down the raw material after vertical and horizontal bending and completes the final shaping. At this point, the raw material becomes a formed tube, and the lower surface of the upper die fits tightly with the upper surface of the adjusting plate;

[0018] (7) The upper die is moved vertically upward and reset. During this process, the retracted part and the upper part of the convex part cooperate to push the cross bar, so that the push-pull block and the core rod move left synchronously with the cross bar. The difference in contact area causes the friction between the lower surface of the fixed die plate and the inner surface of the formed tube to be greater than the friction between the lock block and the lock groove. The core rod moves leftward, so that the lock block moves leftward easily relative to the lock groove and releases the lock. A gap is quickly generated between the core rod and the fixed die plate. The push-pull block is pulled back and reset by the cylinder. The gap prevents the fixed die plate from moving leftward with the core rod.

[0019] (8) The formed tube contacts the inner guide seat, the lower slide plate and the upper slide plate are reset, and the formed tube is taken out, thus completing a complete processing process.

[0020] The beneficial effects of the controllable and easy-to-demold forming die and forming method for pipe processing of the present invention are as follows:

[0021] 1. The internal positioning of the mandrel and the fixed template, and the external positioning of the inner guide seat and the limit block effectively ensure the position accuracy of the pipe. The contact between the first pressing part and the first bearing part, and the contact between the second pressing part and the second bearing part effectively ensure the sequential bending of the pipe in the vertical and horizontal directions. The center pressing plate presses the upper sliding plate and then presses the pipe through the pressing protrusion, effectively ensuring the final shaping of the pipe. Thus, the smooth forming of the symmetrically bent pipes on both sides is effectively ensured;

[0022] 2. The fixed seat, the limit plate and the limit holes inside them effectively ensure the precise positioning of the first pressing block and the second pressing block. The cooperation between the upper guide groove, the lower guide groove and the guide column effectively ensures the movement accuracy of the upper sliding plate and the lower sliding plate. The inner guide groove and the outer guide groove effectively ensure the movement accuracy of the push-pull block. Thus, on the basis of enabling the pipe to be smoothly formed, the forming accuracy of the pipe is effectively ensured;

[0023] 3. The thickness of the fixed template gradually increases from the end close to the push-pull block to the end far from the push-pull block. When the upper die and the lower die are closed, the locking block and the locking groove are locked by friction, and the relative tight fitting of the mandrel, the fixed template and the formed pipe enables the push-pull block to separate the mandrel and the fixed template with only a slight leftward movement, thus smoothly demolding. Thus, the use requirement of "the mandrel can be smoothly demolded without overcoming huge resistance" is effectively met;

[0024] 4. The cooperation of the outer drive plate, the inner drive plate and the cross bar provides good assistance for the smooth movement of the mandrel during the die closing and demolding processes. Combined with the pushing and pulling of the push-pull block by the output end of the cylinder, the external force requirement of the mandrel during the die closing and demolding processes is effectively met;

[0025] 5. The staff can easily replace the adjusting plate, thereby realizing the flexible adjustment of the pressing degree of the center pressing plate. Thus, more than one type of pipe can be processed, effectively enhancing the applicability of this mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art, but it is not a limitation to the protection scope of the present invention.

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the overall structure of the upper die of the present invention;

[0029] Figure 3 It is a schematic diagram of the overall structure of the lower die of the present invention;

[0030] Figure 4 It is a schematic diagram of the internal structure of the lower die of the present invention (I);

[0031] Figure 5 Internal structure schematic diagram (II) of the lower mold of the present invention;

[0032] Figure 6 Partial structure schematic diagram when the upper mold and the lower mold of the present invention are closed;

[0033] Figure 7 is Figure 6 Partial enlarged view of part A in

[0034] Figure 8 Demolding-related structure schematic diagram (I) of the present invention;

[0035] Figure 9 Demolding-related structure schematic diagram (II) of the present invention;

[0036] Figure 10 Demolding-related structure schematic diagram (III) of the present invention.

[0037] Among them, 1 - mounting plate, 2 - lower mold, 3 - upper mold, 4 - inwardly retracted part, 5 - outwardly protruding part, 6 - first downward pressing part, 7 - second downward pressing part, 8 - central pressing plate, 9 - first pressing block, 10 - second pressing block, 11 - inner driving plate, 12 - outer driving plate, 13 - outer guide groove, 14 - fixed seat, 15 - limiting plate, 16 - adjusting plate, 17 - outer guide seat, 18 - cross bar, 19 - second bearing part, 20 - first bearing part, 21 - lower sliding plate, 22 - upper sliding plate, 23 - upper guide groove, 24 - pushing and pulling block, 25 - inner guide groove, 26 - carrier plate, 27 - guide post, 28 - inner guide seat, 29 - fixed wedge, 30 - core rod, 31 - downward pressing protrusion, 32 - formed pipe, 33 - limiting block, 34 - locking block, 35 - fixed template, 36 - low inclination part, 37 - locking groove, 38 - high inclination part. Detailed implementation manner

[0038] To make the description clearer, in combination with the accompanying drawings of the specification, a controllable and easy-to-demold forming mold for pipe processing and its forming method of the present invention are further described.

[0039] A controllable and easy-to-demold forming die for pipe processing, comprising an upper die 3 and a lower die 2. The upper die 3 is located directly above the lower die 2. It is characterized in that: a carrier plate 26 is fixedly arranged at the middle position of the upper part of the lower die 2. A fixed template 35 is arranged above the middle position of the carrier plate 26. A mandrel 30 is arranged above the fixed template 35. The fixed template 35 is slidably connected to the mandrel 30. A push-pull block 24 is arranged at the left end of the mandrel 30. The mandrel 30 is snap-connected to the push-pull block 24. A fixed wedge 29 is vertically and fixedly arranged at the snap-connection position of the mandrel 30 and the push-pull block 24. Lower sliding plates 21 are symmetrically and slidably arranged on both sides of the mandrel 30 at the upper part of the carrier plate 26. An upper sliding plate 22 is slidably arranged on the upper part of the lower sliding plate 21. First pressing blocks 9 are symmetrically and fixedly arranged on both sides of the lower part of the upper die 3. Second pressing blocks 10 are symmetrically and fixedly arranged on both sides of the lower part of the upper die 3 and on both sides of the first pressing blocks 9. A central pressing plate 8 is fixedly arranged at the middle position of the lower part of the upper die 3. A limiting block 33 is fixedly arranged at the middle position of the upper part of the lower die 2 and on the right side of the carrier plate 26. Fixed seats 14 are symmetrically and fixedly arranged on both sides of the upper part of the lower die 2 and on both sides of the carrier plate 26. Limiting plates 15 are fixedly arranged above the upper sliding plates 22 and on the upper parts of the fixed seats 14. Limiting holes are vertically penetrated at the corresponding positions of the limiting plates 15 and the first pressing blocks 9 and the second pressing blocks 10. Lower pressing protrusions 31 are arranged on the lower parts of the upper sliding plates 22 at the adjacent sides. Adjusting plates 16 are arranged on the farther sides of the upper parts of the limiting plates 15.

[0040] Further, a first lower pressing part 6 is arranged at the lower part of the first pressing block 9. A second lower pressing part 7 is arranged at the lower part of the second pressing block 10. A first bearing part 20 is arranged at the middle position of the farther side of the upper part of the lower sliding plate 21. Second bearing parts 19 are symmetrically arranged on both sides of the farther side of the upper part of the upper sliding plate 22. The position of the first bearing part 20 corresponds to the position of the first lower pressing part 6. The position of the second bearing part 19 corresponds to the position of the second lower pressing part 7. The contact between the first lower pressing part 6 and the first bearing part 20 is completed prior to the start of the contact between the second lower pressing part 7 and the second bearing part 19. Through grooves are vertically penetrated at the corresponding positions of the upper sliding plate 22 and the first pressing block 9 and at the corresponding positions of the lower sliding plate 21 and the second pressing block 10.

[0041] Further, guide columns 27 are symmetrically and fixedly arranged on both sides of the upper part of the carrier plate 26. Upper guide grooves 23 are vertically penetrated at the corresponding positions of the upper sliding plate 22 and the guide columns 27. Lower guide grooves are vertically penetrated at the corresponding positions of the lower sliding plate 21 and the guide columns 27. The running directions of the upper guide grooves 23 and the lower guide grooves are both in the front-back direction.

[0042] Furthermore, the thickness of the fixed template 35 gradually increases from the end close to the push-pull block 24 to the end far from the push-pull block 24. A sliding connection part is arranged at the middle position of the upper part of the fixed template 35. The sliding connection part is successively provided with a low-inclination part 36, a locking groove 37, and a high-inclination part 38 from the end close to the push-pull block 24 to the end far from the push-pull block 24. A locking block 34 is arranged above the locking groove 37. The locking block 34 is clamped with the mandrel 30. When the upper die 3 and the lower die 2 are closed, the locking block 34 and the locking groove 37 are locked by friction.

[0043] Furthermore, an inner guide seat 28 is fixedly arranged at the middle position of the upper part of the lower die 2 and on the left side of the carrier plate 26. An inner guide groove 25 is horizontally penetrated through the middle position of the inner guide seat 28. An outer guide seat 17 is fixedly arranged at the middle position of the upper part of the lower die 2 and to the left of the inner guide seat 28. An outer guide groove 13 is horizontally penetrated through the middle position of the outer guide seat 17. The push-pull block 24 is slidably connected with both the inner guide groove 25 and the outer guide groove 13.

[0044] Furthermore, a cross bar 18 is horizontally and fixedly arranged at the middle position of the push-pull block 24. Outer drive plates 12 are symmetrically and fixedly arranged on the left side of the lower part of the upper die 3. An inward-receiving part 4 is arranged at the lower part of the outer drive plate 12. The cross-sectional shape of the inward-receiving part 4 is a right-angled triangle. An inner drive plate 11 is fixedly arranged at the lower part of the upper die 3 and to the right of the outer drive plate 12. An outward-protruding part 5 is arranged at the lower part of the inner drive plate 11. The cross-sectional shape of the outward-protruding part 5 is an isosceles trapezoid. Both the outer drive plate 12 and the inner drive plate 11 are slidably connected with the cross bar 18.

[0045] Furthermore, a mounting plate 1 is fixedly arranged at the middle position of the left end of the lower die 2. A cylinder is fixedly arranged on the right side of the mounting plate 1. The output end of the cylinder is fixedly connected with the push-pull block 24.

[0046] Furthermore, a forming method of a controllable and easy-to-demold forming die for pipe processing is as follows:

[0047] (1) In the initial state, the upper die 3 and the lower die 2 are separated. Select a suitable adjusting plate 16 according to the pipe processing requirements, and fix the adjusting plate 16 at the corresponding position on the upper part of the limiting plate 15. Place the preliminarily bent raw material on the upper part of the carrier plate 26 and the lower part of the fixed template 35. Push the push-pull block 24 to a predetermined position through the cylinder, and vertically move the upper die 3 downward;

[0048] (2) The lower half part of the outward-protruding part 5 pushes the cross bar 18, so that the push-pull block 24 and the mandrel 30 move leftward synchronously with the cross bar 18. The locking block 34 pushes the low-inclination part 36, so that the fixed template 35 drives the raw material to move leftward until the raw material moves between the inner guide seat 28 and the limiting block 33 and abuts against both of them;

[0049] (3) The retracted portion 4 and the upper part of the convex portion 5 cooperate to push the cross bar 18, so that the push-pull block 24 and the core rod 30 move rightward synchronously with the cross bar 18 until the locking block 34 contacts the high-inclined portion 38. At this time, the core rod 30 fits tightly with the fixed template 35, and the locking block 34 and the locking groove 37 are locked by friction.

[0050] (4) The fixed seat 14 and the limiting plate 15 limit the first pressing block 9, the first pressing portion 6 contacts the first pressure-bearing portion 20, and pushes the lower slide plates 21 to approach each other. The side of the lower slide plates 21 that is close to each other bends the raw material in the vertical direction. The guide column 27 cooperates with the lower guide groove to ensure that the movement process of the lower slide plate 21 maintains the required accuracy.

[0051] (5) The fixing seat 14 and the limiting plate 15 limit the second pressing block 10, the second lower pressing portion 7 contacts the second pressure bearing portion 19, and pushes the upper slide plate 22 to approach each other. The adjacent side of the upper slide plate 22 bends the raw material in the horizontal direction. The guide column 27 cooperates with the upper guide groove 23 to keep the required accuracy during the movement of the upper slide plate 22;

[0052] (6) The center pressing plate 8 passes through the gap of the limiting plate 15 and presses down the upper sliding plate 22 until the pressing protrusion 31 presses down the raw material after vertical and horizontal bending and completes the final shaping. At this point, the raw material becomes a formed tube 32, and the lower surface of the upper mold 3 is tightly fitted with the upper surface of the adjustment plate 16;

[0053] (7) The upper die 3 is moved vertically upward and reset. During this process, the retracted portion 4 and the upper part of the convex portion 5 cooperate to push the cross bar 18, so that the push-pull block 24 and the core rod 30 move left synchronously with the cross bar 18. The difference in contact area causes the friction between the lower surface of the fixed die plate 35 and the inner surface of the forming tube 32 to be greater than the friction between the locking block 34 and the locking groove 37. The core rod 30 moves leftward, so that the locking block 34 moves leftward easily relative to the locking groove 37 and is unlocked. A gap is quickly generated between the core rod 30 and the fixed die plate 35. The push-pull block 24 is pulled back and reset by the cylinder. The gap prevents the fixed die plate 35 from moving leftward with the core rod 30.

[0054] (8) The formed tube 32 contacts the inner guide seat 28, the lower slide plate 21 and the upper slide plate 22 are reset, and the formed tube 32 is taken out, thus completing a complete processing process.

[0055] The working principle of the controllable and easy-to-demold forming die and forming method for pipe processing of the present invention is as follows: through the steps (1) to (8) of the above-mentioned forming method, the forming-related work can be successfully completed, while ensuring the pipe forming accuracy, the core rod 30 can be smoothly demolded without overcoming huge resistance, and its own applicability is effectively enhanced.

[0056] The above are only the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be thought of without creative efforts should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope defined by the claims.

Claims

1. A controllable and easily demouldable forming die for pipe processing, comprising an upper die and a lower die, wherein the upper die is located directly above the lower die, and is characterized in that: A carrier plate is fixedly arranged at the middle position of the upper part of the lower die. A fixed template is arranged above the middle position of the carrier plate. A core rod is arranged above the fixed template. The fixed template is slidably connected with the core rod. A push-pull block is arranged at the left end of the core rod. The core rod is clamped with the push-pull block. A fixed wedge is vertically and fixedly arranged at the clamping position of the core rod and the push-pull block. Lower sliding plates are symmetrically and slidably arranged on both sides of the core rod at the upper part of the carrier plate. An upper sliding plate is slidably arranged on the upper part of the lower sliding plates. First pressing blocks are symmetrically and fixedly arranged on both sides of the lower part of the upper die. Second pressing blocks are symmetrically and fixedly arranged on both sides of the lower part of the upper die and on both sides of the first pressing blocks. A central pressing plate is fixedly arranged at the middle position of the lower part of the upper die. A limiting block is fixedly arranged at the middle position of the upper part of the lower die and on the right side of the carrier plate. Fixed seats are symmetrically and fixedly arranged on both sides of the upper part of the lower die and the carrier plate. Limiting plates are fixedly arranged above the fixed seats and above the upper sliding plates. Limiting holes are vertically penetrated through the corresponding positions of the limiting plates and the first pressing blocks and the second pressing blocks. Lower pressing protrusions are arranged on the lower parts of the upper sliding plates at the adjacent sides. Adjusting plates are arranged on the far sides of the upper parts of the limiting plates.

2. The controllable and easily demoldable forming die for pipe processing according to claim 1, wherein, A first lower pressing part is arranged at the lower part of the first pressing block. A second lower pressing part is arranged at the lower part of the second pressing block. A first bearing part is arranged at the middle position of the upper part of the far side of the lower sliding plate. Second bearing parts are symmetrically arranged on both sides of the upper part of the far side of the upper sliding plate. The position of the first bearing part corresponds to that of the first lower pressing part. The position of the second bearing part corresponds to that of the second lower pressing part. The contact between the first lower pressing part and the first bearing part is completed prior to the start of the contact between the second lower pressing part and the second bearing part. Through grooves are vertically penetrated through the corresponding positions of the upper sliding plate and the first pressing block and the corresponding positions of the lower sliding plate and the second pressing block.

3. A controllable and easily demoldable forming die for pipe processing according to claim 1, characterized in that, Guide columns are symmetrically and fixedly arranged on both sides of the upper part of the carrier plate. Upper guide grooves are vertically penetrated through the corresponding positions of the upper sliding plate and the guide columns. Lower guide grooves are vertically penetrated through the corresponding positions of the lower sliding plates and the guide columns. The running directions of the upper guide grooves and the lower guide grooves are both in the front-back direction.

4. A controllable and easily demoldable forming die for pipe processing according to claim 1, characterized in that The thickness of the fixed template gradually increases from the end close to the push-pull block to the end far from the push-pull block. A sliding connection part is arranged at the middle position of the upper part of the fixed template. The sliding connection part is sequentially provided with a low inclination part, a locking groove, and a high inclination part from the end close to the push-pull block to the end far from the push-pull block. A locking block is arranged above the locking groove. The locking block is clamped with the core rod. When the upper die and the lower die are closed, the locking block and the locking groove are locked by friction.

5. A controllable and easily demoldable molding die for pipe processing according to claim 1, characterized in that, An inner guide seat is fixedly arranged at the middle position of the upper part of the lower die and on the left side of the carrier plate. An inner guide groove is horizontally penetrated through the middle position of the inner guide seat. An outer guide seat is fixedly arranged at the middle position of the upper part of the lower die and on the left side of the inner guide seat. An outer guide groove is horizontally penetrated through the middle position of the outer guide seat. The push-pull block is slidably connected with both the inner guide groove and the outer guide groove.

6. The controllable and easily demoldable forming die for pipe processing according to claim 1, wherein, A cross bar is fixedly arranged horizontally in the middle position of the push-pull block, an outer driving plate is symmetrically fixedly arranged on the left side of the lower part of the upper mold, an inward-retracting part is arranged at the lower part of the outer driving plate, and the cross-sectional shape of the inward-retracting part is a right-angled triangle, an inner driving plate is fixedly arranged at the lower part of the upper mold and to the right of the outer driving plate, an outer convex part is arranged at the lower part of the inner driving plate, and the cross-sectional shape of the outer convex part is an isosceles trapezoid, and the outer driving plate and the inner driving plate are both slidably connected to the cross bar.

7. A controllable and easily demoldable forming die for pipe processing according to claim 1, characterized in that A mounting plate is fixedly arranged at the middle position of the left end of the lower die, a cylinder is fixedly arranged on the right side of the mounting plate, and an output end of the cylinder is fixedly connected to the push-pull block.

8. A controllable and easily demoldable forming die for pipe processing according to claim 1, characterized in that, The molding method is: (1) In the initial state, the upper die is separated from the lower die. A suitable adjustment plate is selected according to the pipe processing requirements, and the adjustment plate is fixed to the corresponding position on the upper part of the limit plate. The preliminarily bent raw material is placed on the upper part of the carrier plate and the lower part of the fixed die plate. The push-pull block is pushed to the predetermined position by the cylinder to move the upper die vertically downward; (2) The lower part of the outer convex part pushes the cross bar, so that the push-pull block and the core rod move to the left synchronously with the cross bar, and the locking block pushes the low-inclined part, so that the fixed template drives the raw material to move to the left, until the raw material moves between the inner guide seat and the limit block and touches both of them; (3) The retracted part and the upper part of the convex part cooperate to push the crossbar, so that the push-pull block and the core rod move right synchronously with the crossbar until the locking block touches the high-inclined part. At this time, the core rod fits tightly with the fixed template, and the locking block and the locking groove are locked by friction; (4) The fixed seat and the limit plate limit the first pressing block, the first lower pressing part contacts the first pressure-bearing part, and the lower slide plates are pushed closer to each other. The adjacent side of the lower slide plates bends the raw material in the vertical direction, and the guide column cooperates with the lower guide groove to keep the required accuracy during the movement of the lower slide plate; (5) The fixed seat and the limit plate limit the second pressing block, the second lower pressing part contacts the second pressure-bearing part, and the upper slide plates are pushed closer to each other. The adjacent side of the upper slide plates bends the raw material in the horizontal direction. The guide column cooperates with the upper guide groove to keep the required accuracy during the movement of the upper slide plate. (6) The center pressing plate passes through the gap of the limiting plate and presses down the upper sliding plate until the pressing protrusion presses down the raw material after vertical and horizontal bending and completes the final shaping. At this point, the raw material becomes a formed tube, and the lower surface of the upper die fits tightly with the upper surface of the adjusting plate; (7) The upper die is moved vertically upward and reset. During this process, the retracted part and the upper part of the convex part cooperate to push the cross bar, so that the push-pull block and the core rod move left synchronously with the cross bar. The difference in contact area causes the friction between the lower surface of the fixed die plate and the inner surface of the formed tube to be greater than the friction between the lock block and the lock groove. The core rod moves leftward, so that the lock block moves leftward easily relative to the lock groove and releases the lock. A gap is quickly generated between the core rod and the fixed die plate. The push-pull block is pulled back and reset by the cylinder. The gap prevents the fixed die plate from moving leftward with the core rod. (8) The formed tube contacts the inner guide seat, the lower slide plate and the upper slide plate are reset, and the formed tube is taken out, thus completing a complete processing process.

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