Extrusion discharging device for barrel forgings

Abstract

The utility model relates to an extrusion discharging device for barrel forgings. The die comprises a male die, a discharging device and a female die, an inner hole is formed in the discharging device, the male die can be embedded into the inner hole, the discharging device is of a rotating body structure, an annular groove is formed in the middle of the side face of the discharging device in a surrounding mode, a boss is arranged at the bottom of the annular groove, a female die inner hole is formed in the female die, and a round step is arranged on the upper portion in the female die inner hole. The discharging device is arranged on the circular step of the inner hole of the female die through the boss. The utility model solves the problems of poor guide precision, eccentric inner hole of the barrel forge piece, uneven end face of the barrel after backward extrusion forming, complicated installation of a discharging device and the like in the extrusion process of the barrel forge piece.

Description

Technical Field

[0001] This utility model belongs to the field of extrusion forming technology of cylindrical forgings, and particularly relates to an extrusion unloading device for cylindrical forgings. Background Technology

[0002] Cylindrical forgings often employ reverse extrusion forming during extrusion molding. This involves using an upper die punch to extrude the billet, causing it to flow in the opposite direction of the die's movement to form a deep-hole forging. As the billet temperature decreases, the inner hole shrinks due to thermal expansion and contraction, tightly encasing the upper die punch. This makes it difficult to demold the forging after it is completed. Therefore, a stripping device is needed to unload and demold the forging after extrusion.

[0003] Currently, there are two main types of unloading devices after extrusion of cylindrical materials. The first type uses an elastic unloading device, which uses a stud and a spring as a base to fix the unloading ring to the end of the stud and makes a reciprocating motion with the upper die. The second type uses a rigid unloading device, which uses a stud as a base to fix the unloading ring to the end of the stud. When the upper die moves, the unloading device does not move.

[0004] The first unloading method uses an elastic unloading device, which can reciprocate with the upper die, effectively reducing the length of the upper die punch. However, due to limitations in the connection structure, the guiding accuracy is poor during die assembly and extrusion molding. It only serves the purpose of unloading and cannot provide guidance, making the cylindrical forging prone to eccentricity and cumbersome to install. The second method uses a rigid unloading device, which does not reciprocate with the upper die. This structure provides better guidance, but it requires increasing the length of the upper die punch, wasting die material and doubling the die closing height. This makes installation cumbersome, and the lack of a closing structure at the upper end of the forging results in an uneven upper surface of the cylinder after reverse extrusion. Utility Model Content

[0005] This utility model provides a cylindrical forging extrusion unloading device to solve the technical problems existing in the background art. It solves the problems of poor guiding accuracy of cylindrical forgings during the extrusion process, eccentricity of the inner hole of the cylindrical forging, unevenness of the rear end face of the cylindrical reverse extrusion forming, and cumbersome installation of the unloading device.

[0006] The technical solution of this utility model is as follows: This utility model is a cylindrical forging extrusion unloading device, which is special in that: the cylindrical forging extrusion unloading device includes a punch, an unloading device and a die, the unloading device is provided with an inner hole, the punch can be embedded in the inner hole, the unloading device is a rotating structure, an annular groove is provided around the middle of the side of the unloading device, a boss is provided at the bottom of the annular groove, an inner hole is provided in the die, a circular step is provided at the upper part of the inner hole, and the unloading device is set on the circular step in the inner hole of the die through the boss.

[0007] Furthermore, a circular hole is provided on the upper part of the die corresponding to the position of the annular groove, and the die is connected to the annular groove of the unloading device by a circular pin passing through the circular hole.

[0008] Furthermore, the outer circumference side of the upper part of the unloading device is provided with an outer circumference slope.

[0009] Furthermore, there are multiple circular holes, symmetrically arranged around the die.

[0010] Furthermore, there are four circular holes, arranged symmetrically on the die.

[0011] Furthermore, the outer circle slope is 4°.

[0012] Furthermore, a lower pad is provided at the bottom of the inner hole of the die cavity.

[0013] This utility model provides a cylindrical forging extrusion unloading device. The annular unloading device has an outer side that mates with the lower die (concave die) and an inner side that mates with the upper die (punch die), with a certain gap between them to ensure the guiding accuracy of the die. An annular groove is designed on the side of the annular unloading device, serving as a locking structure during forging demolding. The outer surface of the annular unloading device is designed with an outer circular slope to facilitate placement of the unloading device. Four circular holes are designed at the part where the concave die mates with the annular groove for a locking structure during unloading. Therefore, this utility model has the following advantages:

[0014] 1) This utility model can effectively solve the mold guidance problem during reverse extrusion forming of cylindrical forgings by using a material unloading device, reduce the problems of eccentricity of the inner hole and uneven wall thickness of the forging, improve the product qualification rate and reduce the production cost.

[0015] 2) The unloading device of this utility model is not fixedly connected to the mold, eliminating the need for stud connections and other devices. It is placed inside the mold during use, which can effectively solve the problem of complicated installation of the unloading device and improve production efficiency.

[0016] 3) The unloading device of this utility model moves synchronously with the punch during the final forming process and forms a closed structure with the mold, which can solve the problem of uneven rear end face of the cylinder during reverse extrusion forming. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 for Figure 1 A magnified view of part A;

[0019] Figure 3 This is a top view of the present invention;

[0020] Figure 4This is a schematic diagram of the unloading device of this utility model.

[0021] The attached figures are labeled as follows:

[0022] 1. Punch; 2. Unloading device; 3. Die; 4. Forging; 5. Cylindrical pin; 6. Circular step; 7. Lower pad block; 8. Annular groove; 9. Boss; 10. Inner hole.

[0023] Outer circumference of the unloading device; The inner diameter of the unloading device; a, the outer diameter slope of the unloading device; h1, the depth of the groove of the unloading device; h2, the width of the groove of the unloading device; h3, the height of the boss of the unloading device. Detailed Implementation

[0024] The overall scheme of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0025] See Figures 1 to 3 The structure of this utility model embodiment includes a punch 1, an unloading device 2, and a die 3. The unloading device 2 has an inner hole 10, into which the punch 1 can be embedded. The unloading device 2 is a rotating structure. An annular groove 8 is arranged around the center of the side of the unloading device 2, and a boss 9 is provided at the bottom of the annular groove 8. The die 3 has an inner hole, and a circular step 6 is provided at the upper part of the inner hole. The unloading device 2 is mounted on the circular step 6 in the inner hole of the die through the boss 9. A circular hole is provided on the upper part of the die 3 corresponding to the position of the annular groove 8. The die 3 is fixedly connected to the annular groove 8 of the unloading device 2 by a circular pin 5 passing through the circular hole, forming a locking mechanism. There are multiple circular holes, symmetrically arranged around the die 3. In this embodiment, there are 4 circular holes, centrally symmetrically arranged on the die 3. The outer circumference of the upper part of the unloading device 2 is provided with an outer circumference slope, which is 4° in this embodiment. A lower pad 7 is provided at the bottom of the inner hole of the die.

[0026] The specific process for using this utility model is as follows:

[0027] Part 1: Mold Processing

[0028] 1. Fabrication of unloading device: See Figure 4 The unloading device 2 of this utility model adopts a rotating body structure, and the forging 4 can also refer to this structural type.

[0029] Inner hole of unloading device It is manufactured according to the corresponding position dimensions of punch 1, and a gap is ensured between it and punch 1. In this embodiment, the gap is manufactured to be 0.6mm.

[0030] outer circle of unloading device It is manufactured according to the corresponding position dimensions of the die 3, and a gap is maintained between it and the die 3. In this embodiment, the gap is manufactured to be 0.6mm.

[0031] An outer circular slope 'a' is made on the upper outer circular side of the unloading device. In this embodiment, the slope value is 4°.

[0032] outer circle of unloading device An annular groove 8 is made in the middle of the side. The height h1 and width h2 of the unloading device groove are selected according to the magnitude of the demolding force and the shearing force. In this embodiment, the value of h1 is 22mm and the value of h2 is 22mm.

[0033] The height h3 of the unloading device boss is designed according to the mold structure, and in this embodiment, it is taken as 10mm.

[0034] 2. Die making:

[0035] A circular step 6 is machined on the upper part of the inner hole of the die 3. The circular step 6 is used to place the unloading device 2, and its size is made to match the boss 9 of the unloading device 2.

[0036] Several circular holes are machined on the upper side of the die 3. In this embodiment, there are four circular holes, evenly distributed symmetrically around a center. The diameter of the circular holes is machined to match the diameter of the circular pins 5, ensuring a clearance fit and facilitating the insertion of the circular pins 5. In this embodiment, the diameter of the circular holes is [missing information].

[0037] 3. Pin making:

[0038] Make 4 round pins (5 in total). In this embodiment, the diameter of the pins is [missing information].

[0039] Part Two: Mold Assembly

[0040] See Figure 2 The unloading device 2 is placed inside the concave mold 3, the punch 1 is placed inside the unloading device 2, and the circular pin 5 is inserted into the circular hole of the concave mold 3 and the annular groove 8 of the unloading device 2 to form a locking mechanism.

[0041] Part Three: Working Principle

[0042] 1. Extrusion molding:

[0043] After the forging blank 4 is placed into the die 3, the unloading device 2 is placed into the die 3, and the punch 1 moves down to extrude the forging 4 into shape.

[0044] 2. Punch unloading:

[0045] After the forging 4 is formed, four circular pins 5 are inserted into the circular holes of the die 3 and the annular grooves 8 of the unloading device 2 to form a locking structure. The unloading device 2 and the die 3 remain relatively stationary. When the punch 1 moves upward, the forging 4 moves relative to the upward-moving punch 1 due to the force of the unloading device 2. The forging 4 is demolded from the die 3 by the locking force. The circular pins 5 are removed in sequence. After the forging 4 is pushed out by the lower pad block 7, the unloading device 2 and the forging 4 are removed in sequence, and the unloading work is completed.

[0046] The content of this utility model and the technical content not specifically described in the above embodiments are the same as the prior art.

[0047] The above are merely specific embodiments disclosed in this utility model, but the scope of protection disclosed in this utility model is not limited thereto. The scope of protection disclosed in this utility model shall be determined by the scope of protection of the claims.

Claims

1. A cylindrical forging extrusion unloading device, characterized in that: The extrusion unloading device for cylindrical forgings includes a punch, an unloading device, and a die. The unloading device has an inner hole, and the punch can be embedded in the inner hole. The unloading device is a rotating structure. An annular groove is arranged around the middle of the side of the unloading device, and a boss is provided at the bottom of the annular groove. The die has an inner hole, and a circular step is provided at the upper part of the inner hole. The unloading device is mounted on the circular step of the inner hole of the die via the boss.

2. The cylindrical forging extrusion unloading device according to claim 1, characterized in that: The upper part of the die has a circular hole corresponding to the position of the annular groove. The die is connected to the annular groove of the unloading device by a circular pin passing through the circular hole.

3. The extrusion unloading device for cylindrical forgings according to claim 2, characterized in that: The outer circumference of the upper part of the unloading device is provided with an outer circumference slope.

4. The cylindrical forging extrusion unloading device according to claim 3, characterized in that: The circular holes are multiple and symmetrically arranged around the die.

5. The cylindrical forging extrusion unloading device according to claim 4, characterized in that: There are four circular holes, arranged symmetrically on the die.

6. The extrusion unloading device for cylindrical forgings according to claim 5, characterized in that: The outer circle slope is 4°.

7. The extrusion unloading device for cylindrical forgings according to any one of claims 1 to 6, characterized in that: A lower pad is provided at the bottom of the inner hole of the die.

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