A higher shell part back extrusion forming manufacturing tooling and method of use

Abstract

The present application relates to the technical field of die forging, in particular to a higher shell part reverse extrusion forming manufacturing tool and using method; including upper die seat, outer cylinder and lower die seat arranged in turn from top to bottom, upper punch is arranged on the upper die seat, lower punch is arranged on the lower die seat, the upper punch and the lower punch all extend to the inside of the outer cylinder, the outer cylinder is limited to slide with the lower die seat and is clamped, upper gasket is arranged between the upper die seat and the outer cylinder, lower gasket is arranged between the lower punch and the outer cylinder.The tool can make the upper punch move up after extrusion, so that the upper punch and the lower punch are demoulded at the same time, avoiding the adhesion of the lower punch and the shell, since the upper punch does not need to be pressed again, the production efficiency of the shell is improved, and the product qualification rate is improved by avoiding the scratch of the inner wall of the shell in the secondary pressing process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of die forging, in particular to a reverse extrusion forming manufacturing tool for higher shell parts and a use method thereof. BACKGROUND

[0002] ‌Reverse extrusion forming process is a metal plastic processing method, and its basic principle is to make metal materials deform plastically in a mold by applying pressure, so as to obtain products with desired shape and size. Reverse extrusion forming technology is suitable for preparing a cylinder with a large height-diameter ratio, because only one extrusion is needed to realize the forming of the high-diameter ratio part, thereby significantly improving the production efficiency and part precision.‌

[0003] At present, the pressing process of the cylinder is formed by the cooperation of the upper and lower punches and the outer cylinder. However, when the height of the prepared shell is greater than 400 mm, the shell is easy to be adhered to the outer cylinder and the lower punch under the action of high pressure. In this case, the integrated outer cylinder, shell and lower punch need to be turned over by 180°, and then the upper punch is pressed in the position opposite to the lower punch, and the lower punch is taken out. In this process, the upper and lower punches are often inconsistent in concentricity, which causes steps on the inner wall of the shell. In addition, since the reverse pressing action needs to be performed at high temperature, the action needs to be rapid and accurate, which has high requirements for the workers. In addition, the temperature of the forged part will drop sharply during the turning process, which reduces the production efficiency of the shell. In addition, the inner wall of the cylinder is seriously damaged by the secondary high pressure, which reduces the product qualification rate. SUMMARY

[0004] In order to solve the above problems, the present application provides a reverse extrusion forming manufacturing tool for higher shell parts and a use method thereof.

[0005] The technical scheme of the present application is: a reverse extrusion forming manufacturing tool for higher shell parts, comprising an upper die seat, an outer cylinder and a lower die seat arranged in sequence from top to bottom, wherein the upper die seat is provided with an upper punch, the lower die seat is provided with a lower punch corresponding to the upper punch, the upper punch and the lower punch both extend into the inner part of the outer cylinder, the outer cylinder is limited to slide and is clamped with the lower die seat, an upper gasket is arranged between the upper die seat and the outer cylinder, the upper gasket comprises a positioning gasket for positioning the outer cylinder and a protective gasket for limiting the size of the part during extrusion, and a lower gasket is arranged between the lower punch and the outer cylinder.

[0006] Note: the above tool can move the upper punch upward after extrusion, so that the upper punch and the lower punch are demolded at the same time, thereby avoiding the adhesion of the lower punch to the shell. Since the upper punch does not need to be pressed again, the production efficiency of the shell is improved, and the shell inner wall is prevented from being damaged during the secondary pressing process, thereby improving the product qualification rate.

[0007] Further, the lower end of the outer cylinder is provided with a clamping block, the inner wall of the lower die seat is provided with an arc-shaped clamping slot for sliding the clamping block, and the upper top surface of the lower die seat is provided with a butt joint groove for extending the clamping block into the arc-shaped clamping slot.

[0008] Description: The clamping mode enables the relative movement between the outer cylinder and the lower die seat, and ensures that the upper punch can drive the shell and the lower punch to separate when the upper punch moves upward.

[0009] Further, the inner wall of the outer cylinder is provided with a plurality of groups of liquid coating assemblies arranged radially and used for applying lubricant into the outer cylinder, each group of liquid coating assemblies comprises a plurality of transversely arranged sliding holes, and a liquid supply pipe arranged on the side wall of the outer cylinder and in one-to-one correspondence with the sliding holes, a piston and a sliding column are slidingly arranged in the sliding hole, one end of the piston is fixedly connected with the sliding column through a connecting rod, a storage groove for releasing lubricant is arranged on the inner wall of the sliding hole and in sliding cooperation with the sliding column, the storage groove is in communication with the sliding hole through the liquid channel in the sliding column, the connecting rod and the piston in sequence, an activity rod corresponding to the liquid coating assembly is vertically limited and slidingly connected in the outer cylinder, the lower end of the activity rod is connected with the outer cylinder through a spring, a V-shaped block is arranged on the connecting rod, and a pressing column for one-to-one corresponding cooperation with the V-shaped block to push the connecting rod to slide left and right is arranged on the activity rod.

[0010] Description: The liquid supply pipe can provide lubricant into the sliding hole, when the upper die seat moves downward, the upper die seat can press the activity rod downward, the pressing column on the activity rod can press the V-shaped block downward, and cooperate with the liquid pressure provided by the liquid supply pipe, so that the connecting rod drives the sliding column to stretch and contract once, when the sliding column contracts inward, the lubricant in the storage groove can be released to the front end of the sliding column, and when the sliding column resets, the lubricant is pushed out, so that the lubricant is applied to the inner wall of the outer cylinder, when the upper die seat moves upward, the activity rod can reset under the action of the spring, so that the sliding column stretches and contracts again to apply the lubricant, avoiding the adhesion of the shell and the outer cylinder, and ensuring that the shell can be separated from the outer cylinder.

[0011] Further, the pressing column is slidingly connected with a blind hole arranged on the activity rod, and the pressing column and the blind hole are connected through a spring, a second air bag for controlling the contraction or elongation of the pressing column by inflation and deflation is sleeved on the pressing column, a first air bag in communication with the second air bag is fixedly sleeved on the upper end of the activity rod, and the upper die seat is provided with a butt joint hole corresponding to the activity rod, and the connecting rod is provided with a clamping hole for clamping the pressing column by elongation.

[0012] Description: When the upper die seat is not butt jointed with the activity rod, the pressing column is clamped with the clamping hole, at this time the sliding column cannot slide at will, avoiding the contraction of the sliding column during extrusion, resulting in defects on the surface of the shell, when the butt joint hole is butt jointed with the activity rod, the upper die seat will first extrude the first air bag, the gas in the first air bag enters the second air bag, so that the pressing column contracts and separates from the clamping hole, at this time the connecting rod can drive the sliding column to slide.

[0013] Further, the side wall of the docking hole is provided with a plurality of clamping columns connected with the docking hole through springs, and the upper end of the movable rod is provided with a clamping groove matched with the clamping column for clamping.

[0014] Description: After the docking hole and the movable rod are docked, the clamping column can be clamped with the clamping groove, and when the upper die holder moves upward, the movable rod can move upward, avoiding insufficient spring force, so that the movable rod cannot be reset. Until the movable rod moves to the top point, the upper die holder continues to move upward, the clamping column shrinks, and the clamping column and the movable rod are separated.

[0015] On the other hand, the use method of the reverse extrusion forming manufacturing tooling of the higher shell part comprises the following steps:

[0016] S1, clamp the outer cylinder to the lower die holder, control the upper die holder to descend, and adjust the position of the lower die holder during the descent of the upper die holder, so that the positioning gasket ring can enter the outer cylinder, and then fix the position of the lower die holder, at this time the upper punch, the lower punch and the outer cylinder are concentric;

[0017] S2, control the upper die holder to ascend so that the upper punch completely exits the outer cylinder, and then remove the positioning gasket ring and replace it with a protective gasket ring;

[0018] S3, preheat the blank, then put the blank into the outer cylinder, control the upper die holder to descend, and the upper punch and the lower punch extrude the blank to obtain the shell;

[0019] S4, after extrusion, control the upper die holder to ascend, because the shell is adhered to the upper punch, the lower punch and the outer cylinder, the outer cylinder will move upward during the ascent of the upper punch, so that the shell is separated from the lower punch, until the outer cylinder is limited by the lower die holder and cannot continue to move upward, with the continuous ascent of the upper die holder, the upper punch is separated from the shell, then the outer cylinder is removed from the lower die holder, and the shell is taken out from the outer cylinder.

[0020] Description: The above method simultaneously demolds the upper punch and the lower punch, avoiding the adhesion of the lower punch and the shell, improving the production efficiency, and avoiding defects on the inner wall of the shell in the second pressing, improving the product qualification rate.

[0021] Further, in step S3, the blank is in a cylindrical shape, and the two ends of the blank are chamfered before heat preservation, and the chamfer radius is R7-R9.

[0022] Description: The cylindrical blank has better forming effect, and the chamfer can reduce stress concentration on the edge of the blank during stamping, improving the surface quality of the shell.

[0023] Further, the preheating method is to heat the blank to 750-850℃ and keep it for 140-160min.

[0024] Description: Heat preservation can improve the plasticity of the blank, reduce the extrusion difficulty, and avoid defects in the shell.

[0025] The beneficial effects of the present application are:

[0026] (1) The tool can move up through the upper punch after extrusion, so that the upper punch and the lower punch are demolded at the same time, avoiding the adhesion of the lower punch and the shell. Since the upper punch does not need to be pressed again, the production efficiency of the shell is improved, and the product qualified rate is improved by avoiding the scratch of the inner wall of the shell in the secondary pressing process.

[0027] (2) When the upper die seat moves downward, the upper die seat can press the movable rod downward, so that the slide rod is stretched once to apply lubricant to the inner wall of the outer cylinder. When the upper die seat moves upward, the movable rod can be reset under the action of the spring, so that the slide rod is retracted once to apply lubricant to the inner wall of the outer cylinder, avoiding the adhesion of the shell and the outer cylinder, and ensuring that the shell can be separated from the outer cylinder.

[0028] (3) The method of the present application avoids the adhesion of the lower punch and the shell by demolding the upper punch and the lower punch at the same time, improves the production efficiency, avoids defects of the inner wall of the shell in the secondary pressing process, and improves the product qualified rate. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a longitudinal sectional view of embodiment 1 of the present application;

[0030] Figure 2 is a schematic diagram of the protective pad ring mounting structure of embodiment 1 of the present application;

[0031] Figure 3 is a longitudinal sectional view of embodiment 2 of the present application;

[0032] Figure 4 is an enlarged view of A of Figure 3 ;

[0033] Figure 5 is a schematic diagram of the movable rod structure of embodiment 2 of the present application;

[0034] Figure 6 is a schematic diagram of the connecting rod structure of embodiment 2 of the present application;

[0035] Figure 7 is a schematic diagram of the outer cylinder structure of embodiment 3 of the present application;

[0036] Figure 8 is an enlarged view of B of Figure 7 ;

[0037] Figure 9 is an enlarged view of C of Figure 7 ;

[0038] Figure 10 is a schematic diagram of the connecting rod structure of embodiment 3 of the present application;

[0039] 1-upper die holder, 11-abutment hole, 12-clamping column, 2-protection washer, 3-positioning washer, 4-upper punch, 5-outer cylinder, 51-sliding hole, 511-storage groove, 52-liquid supply pipe, 53-piston, 54-sliding column, 55-connecting rod, 551-clamping hole, 56-clamping block, 57-movable rod, 571-first air bag, 58-V-shaped block, 59-pressing column, 591-second air bag, 6-lower punch, 8-lower die holder. DETAILED DESCRIPTION

[0040] To further illustrate the manner of and effects accomplished by the present application, the technical solutions of the present application will be clearly and completely described below with reference to experiments.

[0041] Example 1: As shown in Figure 1 , Figure 2 , a higher shell part reverse extrusion forming manufacturing tool, comprising upper die holder 1, outer cylinder 5 and lower die holder 8 arranged in sequence from top to bottom, upper die holder 1 is provided with upper punch 4, upper punch 4 is threadedly connected with upper die holder 1, lower die holder 8 is provided with lower punch 6 corresponding to upper punch 4, lower punch 6 is threadedly connected with lower die holder 8, upper punch 4 and lower punch 6 both extend into the interior of outer cylinder 5, outer cylinder 5 is limitingly slid and clamped with lower die holder 8, upper washer is arranged between upper die holder 1 and outer cylinder 5, upper washer comprises positioning washer 3 for positioning outer cylinder 5 and protection washer 2 for limiting the size of the part during extrusion, positioning washer 3 and protection washer 2 are both connected with upper die holder 1 through bolts, lower washer 7 is arranged between lower punch 6 and outer cylinder 5; the lower end of outer cylinder 5 is provided with clamping block 56, the inner wall of lower die holder 8 has arc-shaped clamping groove for sliding clamping block 56, the upper top surface of lower die holder 8 has abutment groove for enabling clamping block 56 to extend into arc-shaped clamping groove;

[0042] The use method of the above-mentioned higher shell part reverse extrusion forming manufacturing tool, comprising the following steps:

[0043] S1, clamp outer cylinder 5 to lower die holder 8, control upper die holder 1 to descend and adjust the position of lower die holder 8 during the descending process of upper die holder 1, so that positioning washer 3 can enter outer cylinder 5, then fix the position of lower die holder 8, at this time upper punch 4, lower punch 6 and outer cylinder 5 are concentric;

[0044] S2, control upper die holder 1 to ascend so that upper punch 4 completely exits outer cylinder 5, and remove positioning washer 3 and replace it with protection washer 2;

[0045] S3, preheat the blank, then put the blank into outer cylinder 5, control upper die holder 1 to descend, so that upper punch 4 and lower punch 6 extrude the blank to obtain the shell; the blank is in cylindrical shape, and the two ends of the blank are chamfered before heat preservation, the chamfer radius is R8; the preheating method is to heat the blank at 800℃ for 150min;

[0046] S4. After extrusion, control the upper die holder 1 to rise. Since the shell is stuck to the upper punch 4, lower punch 6 and outer cylinder 5, the upper punch 4 will drive the outer cylinder 5 to move upward during the rising process, so that the shell is separated from the lower punch 6. Until the outer cylinder 5 is limited by the lower die holder 8 and can no longer move upward, as the upper die holder 1 continues to rise, the upper punch 4 separates from the shell. Then the outer cylinder 5 is removed from the lower die holder 8 and the shell is taken out from the outer cylinder 5.

[0047] Example 2: As Figure 3 As shown, this embodiment is basically the same as embodiment 1, except that the inner wall of the outer cylinder 5 is provided with five sets of radially arranged coating components for applying lubricant into the outer cylinder 5. Each set of coating components includes five horizontally arranged sliding holes 51 that are connected to the liquid supply pipe 52, and a liquid supply pipe 52 that is provided on the side wall of the outer cylinder 5 and is connected to the sliding holes one by one. A piston plate is slidably sealed inside the liquid supply pipe 52, and the left end of the piston plate is connected to the liquid supply pipe 52 by a spring.

[0048] like Figure 4 As shown, a piston 53 and a sliding column 54 are slidably sealed inside the sliding hole 51. The right end of the piston 53 is fixedly connected to the sliding column 54 via a connecting rod 55. A storage tank 511 is provided on the inner wall of the sliding hole 51 to release lubricant in sliding cooperation with the sliding column 54. The storage tank 511 is connected to the sliding hole 51 via a liquid channel that is sequentially connected to the sliding column 54, the connecting rod 55, and the piston 53. The length of the storage tank 511 is 1.5 cm shorter than the sliding distance of the sliding column 54, and the connection point between the liquid channel and the storage tank 511 is located at the left end of the storage tank 511, ensuring that the liquid channel and the storage tank 511 are not connected when the sliding column 54 slides to the left. A movable rod 57 corresponding to the coating component is vertically limited and slidably connected inside the outer cylinder 5. The outer cylinder 5 is slidably connected to the movable rod 57 through a round hole inside it. A limiting ring is provided on the side wall of the movable rod 57 to limit its sliding range. Figure 5 , Figure 6 As shown, the lower end of the movable rod 57 is connected to the outer cylinder 5 via a spring. The connecting rod 55 is provided with a V-shaped block 58, and the movable rod 57 is provided with a pressure column 59 for correspondingly cooperating with the V-shaped block 58 to push the connecting rod 55 to slide left and right.

[0049] The working principle of the outer cylinder 5 is as follows: the liquid supply pipe 52 pushes the lubricant into the sliding hole 51 under the action of the piston plate, and enters the storage tank 511 through the liquid channel. When the upper mold base 1 descends, the blank will be squeezed and deformed until the upper mold base 1 contacts the movable rod 57. At this time, the first stage of extrusion is completed and the main body of the shell is formed. As the upper mold base 1 continues to descend, the second stage of extrusion begins. Then the upper mold base 1 will press the movable rod 57, causing the movable rod 57 to slide downward. At this time, the pressure column 59 will squeeze the V-block 58, causing the connecting rod 55 to drive the sliding block 58. The column 54 slides to the left and retracts to the left end of the storage tank 511. At this time, the liquid channel is closed by the inner wall of the sliding hole, and the liquid channel is no longer connected with the storage tank 511. At this time, the lubricant in the storage tank 511 is released to the right end of the sliding column 54 under the action of gravity. When the pressure column 59 passes the top of the V-block 58, under the hydraulic action provided by the liquid supply pipe 52, the connecting rod 55 drives the sliding column 54 to start sliding to the right. When the liquid channel is reconnected with the storage tank 511, the storage tank 511 is closed by the sliding column 54. The sliding column 54 continues to slide to the right and pushes the lubricant into the outer cylinder 5.

[0050] When the upper mold base 1 rises, the movable rod 57 will reset under the action of the spring, causing the pressure column 59 to press the V-block 58 again, and causing the sliding column 54 to slide back and forth once to push the lubricant into the outer cylinder 5.

[0051] Example 3: As Figure 7 As shown, this embodiment is basically the same as embodiment 2, except that the pressure column 59 is slidably connected to the blind hole on the movable rod 57, and the pressure column 59 is slidably connected to the blind hole through a slider at its right end. The right end of the slider is connected to the blind hole through a spring. A second airbag 591 is sleeved on the pressure column 59, which is controlled by inflation and deflation to contract or extend the pressure column 59. The second airbag 591 is located at the left end of the slider. A first airbag 571 communicating with the second airbag 591 is fixedly sleeved on the upper end of the movable rod 57. The first airbag 571 communicates with the second airbag 591 through a gas channel provided in the movable rod 57. The upper mold base 1 is provided with a docking hole 11 corresponding to the movable rod 57. Figure 9 , Figure 10 As shown, the connecting rod 55 is provided with a locking hole 551 for engaging with the extended pressure post 59; as Figure 8 As shown, the side wall of the docking hole 11 is provided with two locking posts 12 connected to it by springs, and the upper end of the movable rod 57 is provided with a locking groove that cooperates with the locking posts 12 for locking.

[0052] The working principle of the pressing column 59 is as follows: when the upper die holder 1 does not press the movable rod 57, the pressing column 59 extends outward and is clamped in the clamping hole, at this time, the sliding column 54 cannot be retracted, avoiding the retraction of the sliding column 54 during extrusion, when the upper die holder 1 presses the movable rod 57, the abutting hole 11 will first extrude the first air bag 571, so that the gas in the first air bag 571 enters the second air bag 591, the second air bag 591 is inflated to push the pressing column 59 to slide to the right, at this time, the pressing column 59 is separated from the connecting rod 55, with the continuous downward movement of the movable rod 57, the pressing column 59 can press down the V-shaped block 58, and the sliding column 54 can slide, after the movable rod 57 completely enters the abutting hole 11, the clamping column 12 can be clamped in the clamping groove, when the upper die holder 1 moves upward, the upper die holder 1 can drive the movable rod 57 to move upward, when the movable rod 57 rises to the highest point, the clamping column 12 can be retracted, so that the upper die holder 1 is separated from the movable rod 57.

[0053] Example 4: This example is basically the same as example 1, the difference is that the blank is chamfered before heat preservation, and the chamfer radius is R7.

[0054] Example 5: This example is basically the same as example 1, the difference is that the blank is chamfered before heat preservation, and the chamfer radius is R9.

[0055] Example 6: This example is basically the same as example 1, the difference is that the preheating method is to heat the blank at 750℃ for 140min.

[0056] Example 7: This example is basically the same as example 1, the difference is that the preheating method is to heat the blank at 850℃ for 160min.

Claims

1. A manufacturing tool for back extrusion forming of a higher shell part, characterized in that, The utility model relates to a shell extruding device, including upper die holder (1) from top to bottom set successively, outer tube (5) and lower die holder (8), be equipped with upper punch (4) on upper die holder (1), upper punch (4) is screwed with upper die holder (1), be equipped with with lower punch (6) corresponding with upper punch (4) on lower die holder (8), lower punch (6) is screwed with lower die holder (8), upper punch (4), lower punch (6) all extend to outer tube (5) inside, outer tube (5) and lower die holder (8) limit sliding and clamping, to drive outer tube (5) to go up in the process of upper punch (4) rising, make shell and lower punch (6) separate, and outer tube (5) will be limited by lower die holder (8) and can not continue to go up, be equipped with upper gasket ring between upper die holder (1) and outer tube (5), and upper gasket ring includes the positioning gasket ring (3) for positioning outer tube (5), and the protective gasket ring (2) for limiting part size when extruding, be equipped with lower gasket ring (7) between lower punch (6) and outer tube (5), outer tube (5) lower end is equipped with clamping block (56), the inner wall of lower die holder (8) has the arc clamping groove of making clamping block (56) slide, and the upper top of lower die holder (8) has the butt joint groove of making clamping block (56) extend into arc clamping groove, the inner wall on outer tube (5) is equipped with multiple groups of radially arranged and is used for the liquid coating assembly of applying lubricant to outer tube (5) inside, and each group of liquid coating assembly includes multiple transversely arranged sliding holes (51), and the liquid supply pipe (52) that is set up on the lateral wall of outer tube (5) and is communicated with sliding hole one to one, piston (53) and sliding column (54) are slidably arranged in sliding hole (51), one end of piston (53) is fixedly connected with sliding column (54) through connecting rod (55), the inner wall on sliding hole (51) is equipped with storage groove (511) that releases lubricant with sliding column (54) sliding fit, the liquid channel that sequentially communicates in piston (53), connecting rod (55) and sliding column (54) is communicated with sliding hole (51) by storage groove (511), the movable rod (57) that corresponds with liquid coating assembly one to one is slidably connected with the vertical limit in outer tube (5), and the lower end of movable rod (57) is connected with outer tube (5) through spring, V-shaped block (58) is equipped on connecting rod (55), and the pressure column (59) that is used for one to one corresponding cooperation with V-shaped block (58) is equipped on movable rod (57) and is pushed left and right sliding connecting rod (55).

2. A higher shell part reverse extrusion forming manufacturing tooling according to claim 1, wherein, Pressure column (59) and movable rod (57) are slidably connected with the blind hole that is equipped, and pressure column (59) and blind hole are connected through spring, the second gas bag (591) that is used for controlling pressure column (59) to contract or lengthen by filling and discharging is sleeved on pressure column (59), first gas bag (571) that communicates with second gas bag (591) is fixedly sleeved on the upper end of movable rod (57), and the butt joint hole (11) that corresponds with movable rod (57) is equipped on upper die holder (1), and the clamping hole (551) that is used for lengthening and clamping with pressure column (59) is equipped on connecting rod (55).

3. A higher shell part reverse extrusion forming manufacturing tooling according to claim 2, wherein, The side wall of the docking hole (11) is provided with a plurality of clamping columns (12) connected with the docking hole (11) through springs, and the upper end of the movable rod (57) is provided with a clamping groove matched with the clamping column (12) for clamping.

4. The method of using a higher shell part reverse extrusion forming manufacturing tooling of claim 1, based on any one of claims 1-3, wherein, The method comprises the following steps: S1, the outer cylinder (5) is clamped to the lower die seat (8), the upper die seat (1) is controlled to descend, and the position of the lower die seat (8) is adjusted during the descending process of the upper die seat (1), so that the positioning gasket ring (3) can enter the outer cylinder (5), and then the position of the lower die seat (8) is fixed, at this time, the upper punch (4), the lower punch (6) and the outer cylinder (5) are concentric; S2, control the upper die seat (1) to rise so that the upper punch (4) completely exits the outer cylinder (5), and the positioning gasket ring (3) is removed and replaced with a protective gasket ring (2); S3, the blank is preheated, then the blank is placed in the outer cylinder (5), the upper die seat (1) is controlled to descend, the upper punch (4) and the lower punch (6) are used to extrude the blank, and the shell is obtained; S4, after extrusion, control the upper die seat (1) to rise, because the shell is adhered to the upper punch (4), the lower punch (6) and the outer cylinder (5), the outer cylinder (5) will move upwards during the rising process of the upper punch (4), so that the shell is separated from the lower punch (6), until the outer cylinder (5) is limited by the lower die seat (8) and cannot continue to move upwards, with the continuous rising of the upper die seat (1), the upper punch (4) is separated from the shell, then the outer cylinder (5) is taken off from the lower die seat (8), and the shell is taken out from the outer cylinder (5).

5. The method of using a higher shell part reverse extrusion forming manufacturing tooling of claim 4, wherein, In step S3, the blank is cylindrical, and the two ends of the blank are chamfered before heat preservation, and the chamfer radius is R7-R9.

6. The method of using a higher shell part reverse extrusion forming manufacturing tooling of claim 4, wherein, The preheating method is that the blank is heat preserved at 750-850℃ for 140-160min.

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