A barrel extrusion die

Abstract

The application relates to a cylinder extrusion die and relates to the technical field of metal plastic forming, which comprises a lower base plate, a female die, a male die and an upper die part composed of an upper base plate and a male die fixing plate; the utility model discloses the following innovative points: a cylinder stripping plate driven by a telescopic cylinder is arranged at the top edge of the female die, an annular piece is fixed to the bottom of the stripping plate, and a clamp assembly is arranged below the annular piece. When working, the male die drives the formed cylinder to move upwards, the top end of the cylinder is blocked by the annular piece, and the cylinder is automatically separated from the male die; at the same time, the clamp assembly instantaneously clamps the outer wall of the cylinder, and effectively prevents the cylinder from falling and colliding; the structure realizes automatic and lossless stripping of the cylinder after extrusion, and remarkably improves production safety, efficiency and product yield.

Description

Technical Field

[0001] This application relates to the field of metal plastic forming technology, and in particular to a cylindrical extrusion die. Background Technology

[0002] Cylindrical parts are essential pressure-bearing components in aerospace, automotive manufacturing, petrochemical and other fields. Currently, these parts are generally manufactured using die extrusion molding technology. In existing cylindrical extrusion dies, the formed cylindrical body shrinks and tightly wraps around the punch surface due to cooling, creating a huge clamping force. This makes the demolding process extremely difficult. Currently, there is a general lack of efficient and reliable automated demolding mechanisms. Operators usually need to manually tap or pry with tools to force the cylindrical body to separate from the punch. This manual demolding method has significant drawbacks: First, it relies heavily on operational experience, resulting in low efficiency and potential personal safety hazards. Second, during forced demolding or subsequent processing, the cylinder is prone to accidental loss of control and falling, colliding with equipment or the ground, causing surface damage, scratches, or even overall deformation of the product, seriously damaging product quality and yield. In response to the aforementioned technologies, a cylindrical extrusion mold is proposed that can achieve automatic and non-destructive demolding, and can effectively catch the product and prevent collisions. Summary of the Invention

[0003] The purpose of this application is to provide a cylinder extrusion die to overcome the above-mentioned shortcomings.

[0004] The cylindrical extrusion die provided in this application adopts the following technical solution: It includes a lower backing plate, a concave mold disposed on the lower backing plate, and a convex mold located above the concave mold. The concave mold has a cavity for receiving the blank, and the convex mold is connected to the upper backing plate through a convex mold fixing plate. A telescopic cylinder is provided at the top edge of the concave mold, and a cylindrical ejector plate is connected to the output end of the telescopic cylinder. The cylindrical ejector plate is located above the concave mold and has a through hole in its center for the punch to pass through. An annular component is fixedly connected to the bottom of the cylindrical ejector plate, and a clamping assembly for clamping the formed cylindrical body is provided at the bottom of the annular component.

[0005] By adopting the above technical solution, when the punch moves the forming cylinder upwards for demolding, the top of the cylinder is blocked by the annular component, forcing the cylinder to separate from the punch, thus achieving mechanical automatic demolding. At the same time, the clamping assembly below can immediately clamp the outer wall of the cylinder at the moment of demolding, completely preventing the cylinder from falling due to its own weight and colliding with the equipment or the ground, effectively protecting the surface quality of the product and ensuring the yield rate.

[0006] Preferably, the clamping assembly is provided in two sets, and the two sets of clamping assemblies are symmetrically fixed below the annular part.

[0007] By adopting the above technical solution, the two sets of symmetrically arranged clamping components can provide balanced clamping force from both sides of the cylinder, ensuring the stability of the cylinder during clamping and demolding, and preventing it from tilting, jamming or surface scratches due to unilateral force.

[0008] Preferably, the clamping assembly includes an arc-shaped shell, an arc-shaped clamping plate that can slide radially is disposed inside the arc-shaped shell, and a spring that provides radially inward preload is disposed between the arc-shaped clamping plate and the arc-shaped shell.

[0009] By adopting the above technical solution, the arc-shaped clamping plate can automatically and continuously apply an appropriate clamping force to the outer wall of the cylinder using the preload provided by the spring.

[0010] Preferably, a wedge block is provided on the inner and outer sides of the arc-shaped shell. The wedge block is movably disposed inside the arc-shaped shell. One side of the wedge block abuts against the spring, and the other side is an inclined surface. The clamping assembly also includes an adjusting plate that is vertically movable below the arc-shaped shell. A second wedge block that cooperates with the inclined surface of the first wedge block is fixedly connected to the top of the adjusting plate.

[0011] By adopting the above technical solution, the vertical linear motion of the adjusting plate is converted into the radial linear motion of the wedge block by the inclined surfaces of wedge block one and wedge block two, thereby enabling precise compression or release of the spring.

[0012] Preferably, the adjusting plate is threadedly connected to a screw, the bottom of the screw is provided with a knob, and the top of the screw is rotatably connected to the arc-shaped shell through a bearing. By rotating the knob, the adjusting plate and the second wedge block are driven to move in the vertical direction, and the wedge block is pushed to move radially through the inclined surface to change the preload of the spring.

[0013] By adopting the above technical solution, operators can easily and accurately adjust the preload of the spring by rotating the knob, thereby controlling the clamping force of the clamp on the cylinder. This adjustment method is compact in structure and easy to operate, and can quickly adapt to the different clamping force requirements of cylinders with different materials and wall thicknesses. It effectively solves the problems of insufficient clamping force causing failure to clamp, or excessive clamping force causing difficulty in removal or even damage to the cylinder.

[0014] Preferably, the bottom inner edge of the arc-shaped clamp is provided with a guide slope.

[0015] By adopting the above technical solution, when the formed cylinder moves upward with the punch, its top end can contact and slide along the guide slope, thereby pushing the arc-shaped clamping plate outward.

[0016] Preferably, the top of the punch 8 is fixedly connected to the punch fixing plate 9, and the top of the punch fixing plate 9 is fixedly connected to the upper pad plate 10.

[0017] In summary, this application includes at least one of the following beneficial technical effects: 1. By using a cylindrical ejector plate and annular component driven by a telescopic cylinder, the cylinder can be forcibly blocked when the punch rises, so that it can be reliably separated from the punch that continues to rise. The entire demolding process does not require manual intervention, has a high degree of automation, completely eliminates the safety risks of manual operation, and significantly improves demolding efficiency and consistency. 2. A clamping assembly is set at the bottom of the ring part. The arc-shaped clamping plate can immediately hold the outer wall of the cylinder under the action of spring preload when the cylinder is peeled off by the punch. This design fundamentally avoids the cylinder falling freely due to its own weight after molding, effectively prevents the product from being bumped and damaged before final collection, and ensures the integrity of the product surface and a very high yield. 3. Through the unique design of the knob and screw driving the adjusting plate and wedge block assembly, vertical movement is converted into precise compression of the spring, thereby enabling linear adjustment of the clamping force. This adjustment mechanism is compact in structure and easy to operate, and can meet the different clamping force requirements of cylinders of different specifications and materials. At the same time, the self-locking characteristic of the threaded pair ensures that the preset clamping force is stable in the long term and will not loosen due to the spring restoring force, thus ensuring the reliability of the equipment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 This is a schematic diagram of the cylindrical body forming state of this application; Figure 3 This is a schematic diagram of the cylinder detachment plate structure of this application; Figure 4 This is a bottom view of the fixture assembly structure of this application; Figure 5 This is a cross-sectional view of the fixture assembly structure of this application; Explanation of reference numerals in the attached figures: 1. Lower backing plate; 2. Die cavity; 3. Cavity; 4. Telescopic cylinder; 5. Cylinder release plate; 51. Through hole; 6. Ring part; 7. Fixture assembly; 8. Punch; 9. Punch fixing plate; 10. Upper backing plate; 71. Arc-shaped shell; 72. Arc-shaped clamping plate; 73. Spring; 74. Wedge block one; 75. Wedge block two; 76. Adjusting plate; 77. Screw; 78. Knob; a. Raw material; b. Cylinder. Detailed Implementation

[0019] The following is in conjunction with the appendix Figure 1 -Appendix Figure 5This application will be described in further detail below.

[0020] A cylindrical extrusion die, as shown in the reference. Figure 1-3 It includes a lower pad plate 1, a concave mold 2 disposed on the lower pad plate 1, and a punch 8 located above the concave mold 2. The concave mold 2 has a cavity 3 for accommodating the blank a, and the punch 8 is connected to the upper pad plate 10 through a punch fixing plate 9. A telescopic cylinder 4 is provided at the top edge of the die 2. The output end of the telescopic cylinder 4 is connected to a cylinder release plate 5. The cylinder release plate 5 is located above the die 2 and has a through hole 51 in its center for the punch 8 to pass through. An annular part 6 is fixedly connected to the bottom of the cylinder release plate 5. A clamping assembly 7 for clamping the formed cylinder b is provided at the bottom of the annular part 6.

[0021] When the punch 8 moves the forming cylinder b upward to demold, the top of the cylinder will be blocked by the annular part 6, forcing the cylinder to separate from the punch 8, thus realizing mechanical automatic demolding. At the same time, the clamping assembly 7 below can immediately clamp the outer wall of the cylinder at the moment of demolding, completely avoiding the cylinder from falling due to its own weight and colliding with the equipment or the ground, effectively protecting the surface quality of the product and ensuring the yield. It should be noted that in the initial stage of demolding, when the punch 8 begins to move upward, the resultant force acting on the cylinder b is upward; the strong upward clamping force provided by the punch 8 (dominated by thermal shrinkage) easily overcomes the downward demolding resistance applied by the die 2, which causes the cylinder b to rise along with the punch 8.

[0022] Reference Figure 4-5 The clamping assembly 7 is provided in two sets. The two sets of clamping assemblies 7 are symmetrically fixed below the annular part 6. The two sets of clamping assemblies 7 arranged symmetrically can provide balanced clamping force from both sides of the cylinder, ensuring the stability of the cylinder during clamping and demolding, and preventing it from tilting, jamming or surface scratches due to unilateral force.

[0023] The clamp assembly 7 includes an arc-shaped shell 71, an arc-shaped clamping plate 72 that can slide radially inside the arc-shaped shell 71, and a spring 73 that provides radial inward preload between the arc-shaped clamping plate 72 and the arc-shaped shell 71. With the preload provided by the spring 73, the arc-shaped clamping plate 72 can automatically and continuously apply an appropriate clamping force to the outer wall of the cylinder.

[0024] In the two sets of clamping assemblies 7, the inner diameter of the arc-shaped clamping plate 72 is larger than the inner diameter of the through hole 51 and smaller than the outer diameter of the formed cylinder b, so as to avoid the arc-shaped clamping plate 72 affecting the downward movement of the punch and to be able to clamp the formed cylinder b. A wedge block 74 is provided on the inner and outer sides of the arc-shaped shell 71. The wedge block 74 is movably disposed inside the arc-shaped shell 71. One side of the wedge block 74 abuts against the spring 73, and the other side is an inclined surface. The clamp assembly 7 also includes an adjustment plate 76 that is vertically movable and disposed below the arc-shaped shell 71. The top of the adjustment plate 76 is fixedly connected to a wedge block 75 that cooperates with the inclined surface of the wedge block 74. By using the inclined surfaces of wedge block 74 and wedge block 75, the vertical linear motion of the adjusting plate 76 is converted into the radial linear motion of wedge block 74, thereby enabling precise compression or release of the spring 73.

[0025] The adjusting plate 76 is threadedly connected to the screw 77. The bottom of the screw 77 is provided with a knob 78, and the top of the screw 77 is rotatably connected to the arc-shaped shell 71 through a bearing. By rotating the knob 78, the adjusting plate 76 and the second wedge block 75 are driven to move in the vertical direction. The inclined surface is used to push the first wedge block 74 to move radially, so as to change the preload on the spring 73. Operators can easily and precisely adjust the preload of spring 73 by rotating knob 78, thereby controlling the clamping force of the clamp on the cylinder. This adjustment method is compact and easy to operate, and can quickly adapt to the different clamping force requirements of cylinders with different materials and wall thicknesses. It effectively solves the problems of insufficient clamping force causing failure to clamp, or excessive clamping force causing difficulty in removal or even damage to the cylinder. The threaded connection between the screw 77 and the adjusting plate 76 utilizes the self-locking principle common in mechanical transmission. Specifically, the helix angle of the threaded pair is less than the equivalent friction angle, which is a classic condition for achieving self-locking and is existing technology. When the rotational force is removed, the spring 73, through the wedge block 74, exerts a counterforce on the adjusting plate 76. This counterforce cannot overcome the frictional torque between the threaded pairs to drive the adjusting plate 76 to rotate in the opposite direction, thus effectively preventing the adjusting plate 76 from moving on its own. Once the clamping force is set, it remains stable, eliminating the need for additional locking devices, simplifying the structure and improving the maintainability of the equipment.

[0026] The bottom inner edge of the arc-shaped clamping plate 72 is provided with a guide slope. When the formed cylinder b moves upward with the punch 8, its top end can contact and slide along the guide slope, thereby pushing the arc-shaped clamping plate 72 outward.

[0027] The top of the punch 8 is fixedly connected to the punch fixing plate 9, and the top of the punch fixing plate 9 is fixedly connected to the upper pad 10. The upper pad 10 is used to connect to the main extruder.

[0028] The implementation principle of this application embodiment is as follows: In this embodiment, the blank material 'a' is made of aluminum ingot. During mold operation, blank material 'a' is first placed into the cavity 3 of the punch 8. Then, the main extruder drives the upper die part, composed of the upper pad plate 10, the punch fixing plate 9, and the punch 8, to descend and extrude the blank material 'a' in the cavity 3 of the die 2, shaping it into a cylindrical body 'b'. During demolding, the upper mold moves upward, and the punch 8 moves the formed cylinder b upward synchronously. When the top of the cylinder b contacts and is finally blocked by the annular part 6, the punch 8 continues to move upward, forcing the cylinder b to separate from the surface of the punch 8, thus achieving mechanical automatic demolding. At the same time, the arc-shaped clamping plate 72 of the clamping assembly 7 quickly clamps the outer wall of the cylinder b under the pre-tightening force of the spring 73. The operator only needs to apply a little downward force to pull out the formed cylinder b, effectively preventing it from falling freely and avoiding product collision damage.

[0029] The clamping force of the fixture can be precisely adjusted by rotating the knob 78. The self-locking threaded pair formed by the screw 77 and the adjusting plate 76 can ensure that the preset clamping force remains stable under the continuous reverse action of the spring 73, eliminating the risk of clamping force attenuation or failure. At the same time, the guide slope at the bottom of the arc-shaped clamping plate 72 allows the cylinder b to smoothly open the clamping plate by its own thrust during the upward movement, and automatically reset and clamp after passing through by the spring 73, realizing intelligent material receiving without power.

[0030] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A cylindrical extrusion die, comprising a lower pad plate (1), a die (2) disposed on the lower pad plate (1), and a punch (8) located above the die (2), wherein the die (2) has a cavity (3) for receiving a blank (a), and the punch (8) is connected to the upper pad plate (10) through a punch fixing plate (9); Its features are: A telescopic cylinder (4) is provided at the top edge of the concave mold (2). The output end of the telescopic cylinder (4) is connected to a cylinder detachment plate (5). The cylinder detachment plate (5) is located above the concave mold (2) and has a through hole (51) in its center for the punch (8) to pass through. A ring-shaped piece (6) is fixedly connected to the bottom of the cylinder detachment plate (5). A clamping assembly (7) for clamping the formed cylinder (b) is provided at the bottom of the ring-shaped piece (6).

2. The cylindrical extrusion die according to claim 1, characterized in that, The clamping assembly (7) is provided in two sets, and the two sets of clamping assemblies (7) are symmetrically fixed below the annular part (6).

3. The cylindrical extrusion die according to claim 2, characterized in that, The clamp assembly (7) includes an arc-shaped shell (71), inside which is a radially sliding arc-shaped clamping plate (72), and between the arc-shaped clamping plate (72) and the arc-shaped shell (71) is a spring (73) that provides radially inward preload.

4. A cylindrical extrusion die according to claim 3, characterized in that, The inner and outer sides of the arc-shaped shell (71) are provided with a wedge block one (74), which is movably disposed inside the arc-shaped shell (71). One side of the wedge block one (74) abuts against the spring (73), and the other side is an inclined surface. The clamp assembly (7) also includes an adjustment plate (76) that is vertically movable and disposed below the arc-shaped shell (71). The top of the adjustment plate (76) is fixedly connected with a wedge block two (75) that cooperates with the inclined surface of the wedge block one (74).

5. A cylindrical extrusion die according to claim 4, characterized in that, The adjusting plate (76) is threadedly connected to a screw (77), and a knob (78) is provided at the bottom of the screw (77). By rotating the knob (78), the adjusting plate (76) and the second wedge block (75) are driven to move in the vertical direction. The wedge block (74) is pushed to move radially through the inclined surface to change the preload on the spring (73).

6. A cylindrical extrusion die according to claim 3, characterized in that, The bottom inner edge of the arc-shaped clamp (72) is provided with a guide slope.

7. A cylindrical extrusion die according to claim 3, characterized in that, The top of the punch (8) is fixedly connected to the punch fixing plate (9), and the top of the punch fixing plate (9) is fixedly connected to the upper pad (10).

Images