An outer diameter fine cold extrusion forming die

Abstract

The utility model discloses an outer diameter fine cold extrusion forming die of reducing, including male die, the upper end four corner position department of male die is provided with the guide pillar, male die's left and right two ends are provided with water outlet hole and water inlet hole respectively in the below position department, the inside left and right side position department of male die is provided with the gradient flow layer, and the die is placed horizontally on the cold extrusion lathe, and the water inlet hole is located in the above position department at this time, and the cooling water is added to the gradient flow layer through the water inlet hole of upper end position department, and the cooling water is circulated in the gradient flow layer and is cooled to the above position department of male die, and the cooling water continues to circulate and enters the flow pipeline of both sides position department, and is cooled to the left and right side position department of male die along the flow pipeline, and the cooling water continues to circulate and enters the gradient flow layer of bottom position department, and is finally discharged through the water outlet hole, and the die can be cooled when working through this mode, so that the die is in normal working condition.

Description

Technical Field

[0001] This utility model belongs to the technical field of cold extrusion molding dies for outer diameter precision reduction, and specifically relates to a cold extrusion molding die for outer diameter precision reduction. Background Technology

[0002] The outer diameter shrinking cold extrusion forming die is a type of die used in metal processing. It is mainly used to plastically deform metal billets at room temperature through extrusion, thereby obtaining parts with precise outer diameter dimensions and good surface quality. The die typically consists of a punch, a die, a guide device, a positioning device, and a stripping device. During operation, the metal billet is placed in the die, and the punch moves downward under the action of the press, applying high pressure to the billet, causing it to radially shrink and axially flow within the die, thus achieving the shrinking forming of the outer diameter. This type of die has advantages such as high production efficiency, high part precision, good surface quality, and high material utilization, and is widely used in the automotive, aerospace, and machinery manufacturing industries.

[0003] When using a cold extrusion die for outer diameter reduction, there is intense friction between the die and the blank. At the same time, the plastic deformation of the metal also generates a lot of heat, causing the die temperature to rise continuously. Thermal stress accumulates continuously, and prolonged exposure to high temperatures will degrade the performance of the die material, leading to thermal fatigue phenomena such as cracks and accelerated wear on the die surface, which greatly shortens the service life of the die. Utility Model Content

[0004] The purpose of this utility model is to provide an outer diameter shrinking cold extrusion forming die to solve the problem mentioned in the background art that, during use, there is strong friction between the die and the blank, and the plastic deformation of the metal also generates a lot of heat, causing the die temperature to rise continuously and thermal stress to accumulate. Under long-term high temperature conditions, the performance of the die material will decline, leading to thermal fatigue phenomena such as cracks and accelerated wear on the die surface, which greatly shortens the service life of the die.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a cold extrusion forming die for outer diameter reduction, comprising a punch, guide posts at the four corners of the upper end of the punch, water outlet and water inlet at the lower ends of the left and right ends of the punch, sloped flow layers at the left and right sides of the inner side of the punch, the two sloped flow layers leading to the water inlet and water outlet respectively, flow pipes at the front and rear sides of the punch, the sloped flow layers communicating with the flow pipes, an alloy steel forming surface layer installed at the upper end of the punch, a medium carbon steel bearing layer at the upper end of the alloy steel forming surface layer, a low alloy support layer at the upper end of the medium carbon steel bearing layer, threaded holes A at the four corners of the upper end of the low alloy support layer, the medium carbon steel bearing layer and the alloy steel forming surface layer, a long bolt installed inside the threaded hole A, and a through hole at the lower end of the outer wall of the long bolt.

[0006] Preferably, the installation of the low-alloy support layer, the medium-carbon steel bearing layer, and the alloy steel forming surface layer constitutes a concave mold structure, and the installation of the concave mold and the punch constitutes a complete forming mold.

[0007] Preferably, a threaded hole B is provided at the outer end face of the alloy steel forming surface layer, and a stainless steel bolt is installed at the outer position of the alloy steel forming surface layer through the threaded hole B. The threaded hole B is interconnected with the threaded hole A.

[0008] Preferably, the diameter of the through hole is the same as the diameter of the threaded hole B, and the long bolt is fully inserted into the internal position of the threaded hole A, at which point the center of the through hole is aligned with the threaded hole B.

[0009] Preferably, the stainless steel bolt enters the internal position of the threaded hole B and can pass through the through-hole.

[0010] Preferably, caps are installed on the outer sides of both the water inlet and the water outlet, and the caps are installed with the water inlet and the water outlet by means of a threaded structure.

[0011] Preferably, when the extrusion die is placed laterally, the sloped flow layer guides the cooling water to the flow pipes on both sides.

[0012] Preferably, the flow pipe guides the cooling water to the sloped flow layer at the other side.

[0013] Compared with the prior art, this utility model provides a cold extrusion forming die for outer diameter reduction, which has the following beneficial effects:

[0014] The mold is placed horizontally on the cold extrusion press with the water inlet at the top. Cooling water is added to the sloped flow layer through the water inlet at the top. The cooling water flows through the sloped flow layer to cool the top of the punch. The cooling water continues to flow into the flow pipes on both sides, cooling the left and right sides of the punch. The continuing cooling water enters the sloped flow layer at the bottom and is finally discharged through the water outlet. In this way, the mold can be cooled while it is working, so that the mold is in normal working condition.

[0015] This device designs the groove as a modular structure, dividing the die into a low-alloy support layer, a medium-carbon steel bearing layer, and an alloy steel forming surface layer. The alloy steel forming surface layer withstands high pressure and friction, and the modular structure design facilitates maintenance and replacement. The medium-carbon steel bearing layer maintains the stability of the multi-layer structure, and the low-alloy support layer ensures the strength of the mold. Through the splicing and modular structure, it is convenient to replace parts after wear. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a cold extrusion molding die for outer diameter precision reduction according to this utility model.

[0017] Figure 2 This is a schematic diagram of the split structure of a cold extrusion molding die for outer diameter precision shrinking according to this utility model.

[0018] Figure 3 This is a schematic diagram of the long rod bolt structure of a cold extrusion molding die for outer diameter precision shrinking according to this utility model.

[0019] Figure 4 This is a schematic diagram of the cross-sectional structure of the alloy steel forming surface layer of a cold extrusion die for outer diameter reduction according to this utility model.

[0020] Figure 5 This is a schematic diagram of the cross-sectional structure of the punch of a cold extrusion forming die for outer diameter reduction according to this utility model.

[0021] In the diagram: 1. Punch; 2. Stainless steel bolt; 3. Long bolt; 4. Low alloy support layer; 5. Medium carbon steel bearing layer; 6. Alloy steel forming surface layer; 7. Cap; 8. Water inlet; 9. Guide post; 10. Through round hole; 11. Threaded hole A; 12. Water outlet; 13. Sloping flow layer; 14. Flow pipe; 15. Threaded hole B. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0023] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] The utility model provides, for example Figure 1-5 The diagram shows a cold extrusion die for outer diameter reduction, comprising a punch 1. Guide posts 9 are positioned at the four corners of the upper end of the punch 1. Water outlet holes 12 and water inlet holes 8 are respectively provided at the lower ends of the punch 1. Sloping flow layers 13 are provided on the left and right sides inside the punch 1, leading to the water inlet holes 8 and the water outlet holes 12 respectively. Flow pipes 14 are provided on the front and rear sides of the punch 1, and the sloping flow layers 13 and the flow pipes 14 are interconnected. An alloy steel forming surface layer 6 is installed at the upper end of the punch 1. A medium carbon steel bearing layer 5 is provided at the upper end of the alloy steel forming surface layer 6. A low alloy support layer 4 is provided at the upper end of the medium carbon steel bearing layer 5. Threaded holes A11 are provided at the four corners of the upper end of the low alloy support layer 4, the medium carbon steel bearing layer 5 and the alloy steel forming surface layer 6. A long bolt 3 is installed on the inner side of the threaded hole A11. A through hole 10 is provided on the outer wall of the long bolt 3 at the lower position.

[0026] The mold is installed on a cold extrusion press. The metal billet to be processed is placed inside the core of punch 1. The extruder pushes the pressure ring through the piston, causing the workpiece to undergo plastic deformation under the constraint of the mold. The outer diameter is reduced under the control of the mold core and forms the set size. After completion, the ejection mechanism is started to eject the formed part from the mold.

[0027] like Figure 3 and Figure 4 As shown, the installation of the low-alloy support layer 4, the medium-carbon steel bearing layer 5, and the alloy steel forming surface layer 6 constitutes a concave mold structure. The installation of the concave mold and the punch 1 constitutes a complete forming mold. A threaded hole B15 is provided at the outer end face of the alloy steel forming surface layer 6. A stainless steel bolt 2 is installed at the outer position of the alloy steel forming surface layer 6 through the threaded hole B15. The threaded hole B15 is interconnected with the threaded hole A11. The diameter of the circular hole 10 is the same as the diameter of the threaded hole B15. When the long bolt 3 is fully inserted into the internal position of the threaded hole A11, the center of the circular hole 10 is aligned with the threaded hole B15. The stainless steel bolt 2 enters the internal position of the threaded hole B15 and can pass through the circular hole 10.

[0028] The die is divided into a low-alloy support layer 4, a medium-carbon steel bearing layer 5, and an alloy steel forming surface layer 6. The alloy steel forming surface layer 6 withstands high pressure and friction, and the modular structure design facilitates maintenance and replacement. The medium-carbon steel bearing layer 5 maintains the stability of the multi-layer structure, and the low-alloy support layer 4 ensures the strength of the die.

[0029] like Figure 1 and Figure 5 As shown, caps 7 are installed on the outer sides of the water inlet 8 and the water outlet 12. The caps 7 are installed with the water inlet 8 and the water outlet 12 through a threaded structure. When the extrusion die is placed horizontally, the slope flow layer 13 guides the cooling water to the flow pipes 14 on both sides. The flow pipes 14 guide the cooling water to the slope flow layer 13 on the other side.

[0030] The mold is placed horizontally on the cold extrusion press. At this time, the water inlet 8 is located at the top. Cooling water is added to the slope flow layer 13 through the water inlet 8 at the top. The cooling water flows through the slope flow layer 13 to cool the top of the punch 1. The cooling water continues to flow into the flow pipes 14 at both sides and flows along the flow pipes 14 to cool the left and right sides of the punch 1. The cooling water continues to flow into the slope flow layer 13 at the bottom and is finally discharged through the water outlet 12.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cold extrusion die for outer diameter precision shrinkage, characterized in that, The device includes a punch (1), with guide posts (9) at the four corners of its upper end. Water outlets (12) and water inlets (8) are respectively located at the lower ends of the punch (1). Sloping flow layers (13) are provided on the left and right sides inside the punch (1), with the two sloping flow layers (13) leading to the water inlets (8) and water outlets (12) respectively. Flow pipes (14) are provided on the front and rear sides of the punch (1), and the sloping flow layers (13) and flow pipes (14) are interconnected. The punch (1) has… An alloy steel forming surface layer (6) is installed at the upper end. A medium carbon steel bearing layer (5) is provided at the upper end of the alloy steel forming surface layer (6). A low alloy support layer (4) is provided at the upper end of the medium carbon steel bearing layer (5). Threaded holes A (11) are provided at the four corners of the upper end of the low alloy support layer (4), the medium carbon steel bearing layer (5) and the alloy steel forming surface layer (6). A long bolt (3) is installed on the inner side of the threaded hole A (11). A through hole (10) is provided on the outer wall of the long bolt (3) at the lower position.

2. The cold extrusion forming die for outer diameter shrinkage according to claim 1, characterized in that: The installation of the low alloy support layer (4), the medium carbon steel bearing layer (5) and the alloy steel forming surface layer (6) forms a concave mold structure, and the installation of the concave mold and the punch (1) forms a complete forming mold.

3. The cold extrusion forming die for outer diameter shrinkage according to claim 1, characterized in that: A threaded hole B (15) is provided at the outer end face of the alloy steel forming surface layer (6). A stainless steel bolt (2) is installed at the outer end face of the alloy steel forming surface layer (6) through the threaded hole B (15). The threaded hole B (15) is interconnected with the threaded hole A (11).

4. The cold extrusion forming die for outer diameter shrinkage according to claim 3, characterized in that: The diameter of the through hole (10) is the same as the diameter of the threaded hole B (15). When the long bolt (3) is fully inserted into the inside of the threaded hole A (11), the center of the through hole (10) is aligned with the threaded hole B (15).

5. The cold extrusion forming die for outer diameter shrinkage according to claim 4, characterized in that: The stainless steel bolt (2) enters the internal position of the threaded hole B (15) and can pass through the through hole (10).

6. The cold extrusion forming die for outer diameter shrinkage according to claim 1, characterized in that: A cap (7) is installed on the outer side of both the water inlet (8) and the water outlet (12). The cap (7) is installed with the water inlet (8) and the water outlet (12) by means of a threaded structure.

7. The cold extrusion forming die for outer diameter shrinkage according to claim 1, characterized in that: When the extrusion die is placed horizontally, the slope flow layer (13) guides the cooling water to the flow pipes (14) on both sides.

8. The cold extrusion forming die for outer diameter reduction according to claim 7, characterized in that: The flow pipe (14) guides the cooling water to the slope flow layer (13) at the other side.

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