A dry-bag cold isostatic pressing die for pressing cemented carbide turning and shaping cutter blanks

Abstract

This utility model discloses a dry-bag cold isostatic pressing mold for pressing cemented carbide turning and shaping cutter blanks. A dynamic sealed cavity is formed by bidirectionally fitting a lower positioning boss of the lower end cap and an upper positioning boss of the upper end cap with a polyurethane elastic mold body. The integrated end cap improves structural stability, and the hollow sleeve-type elastic inner wall and the positioning boss work together to constrain the flow path of the cemented carbide powder. Combined with the upper and lower mold cores, the shape of the turning cutter is achieved. The machined turning cutter bar already has center holes at both ends, thus eliminating the need for machining the center holes at both ends, optimizing the entire production process and reducing cemented carbide powder loss.

Description

Technical Field

[0001] This utility model relates to the field of gear cutting tool manufacturing technology, specifically to a dry bag cold isostatic pressing mold for pressing cemented carbide turning and shaping tool blanks. Background Technology

[0002] Traditionally, when using carbide powder to machine cutting tools such as gear turning cutters, it is often necessary to first place the carbide powder in a rigid cylinder, press it into a solid rod by applying pressure from above and below, and then perform the processes of turning the outer diameter and machining the center holes and threaded holes at both ends. This has the following problems: 1. Significant material waste: The blank for the gear cutting tool needs to be pressed into a solid cylindrical bar first, and then the excess material is removed by turning, resulting in low utilization of cemented carbide materials; 2. Complex and inefficient process: The bar stock needs to go through multiple processes such as turning the outer diameter, drilling the center holes at both ends, tapping the threaded holes, and precision grinding. The processing time for a single piece is relatively high and the processing efficiency is low. 3. Loss of dimensional accuracy: Multiple clamping operations during multi-process machining lead to deviations in the coaxiality of the center hole and the outer circle, as well as deviations in the position of the threaded hole. Utility Model Content

[0003] The purpose of this invention is to overcome the defects in the existing technology and provide a dry bag cold isostatic pressing mold for pressing cemented carbide turning cutter and gear shaping cutter blanks.

[0004] To achieve the above objectives, the technical solution of this utility model is to design a dry bag cold isostatic pressing mold for pressing cemented carbide turning and shaping cutter blanks, including a pressing lower end cover, an elastic mold body, and a pressing upper end cover. The pressing lower end cover includes a lower cover body and a lower positioning boss, which is disposed on the lower cover body and has a lower mold core. The pressing upper end cover includes an upper cover body and an upper positioning boss, which is disposed on the upper cover body and has an upper mold core. The two ends of the elastic mold body are respectively fitted onto the lower positioning boss and the upper positioning boss.

[0005] Preferably, the outer diameters of the lower cover and the upper cover are consistent with the outer diameter of the elastic mold.

[0006] Specifically, the shapes of the lower mold core and the upper mold core are consistent with the shapes of the holes and grooves at both ends of the part to be processed.

[0007] Specifically, the elastic mold body is a hollow sleeve structure, and its inner wall forms a cavity with the lower positioning boss and the upper positioning boss.

[0008] Preferably, both the lower and upper pressing caps are integrally formed. Integral forming avoids assembly errors from separate parts and enhances the mold's compressive strength. The preferred material for both the lower and upper pressing caps is 45# steel.

[0009] Preferably, the elastic mold is made of polyurethane rubber. Because polyurethane rubber has high wear resistance, high elasticity and load-bearing capacity, and high tear strength, the elastic mold is preferably made of polyurethane rubber, with a Shore hardness of 85-95 degrees, preferably 90 degrees.

[0010] The advantages and beneficial effects of this utility model are as follows: 1. Improved material utilization: The center hole and threaded hole are directly formed through the mold cavity, reducing machining allowance and improving material utilization. 2. Simplified process: The outer circle and the hole system at both ends are formed simultaneously by one pressing, eliminating the need for subsequent drilling processes; 3. Enhanced dimensional consistency: Compression molding avoids errors from multiple clamping operations, improving product coaxiality; 4. Increased production efficiency: Fewer processes and shorter production cycles; Attached Figure Description

[0011] Figure 1 This is a structural cross-sectional view of the mold of this utility model.

[0012] In the diagram: 1. Pressing the lower end cap; 10. Lower cover body; 11. Lower positioning boss; 12. Lower mold core; 2. Elastic mold body; 3. Pressing the upper end cap; 30. Upper cover body; 31. Upper positioning boss; 32. Upper mold core; 4. Cavity. Detailed Implementation

[0013] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0014] according to Figure 1 As shown, this utility model is a dry bag cold isostatic pressing mold for pressing cemented carbide turning and shaping cutter blanks, including a lower pressing end cover 1, an elastic mold body 2, and an upper pressing end cover 3. The lower pressing end cover 1 includes a lower cover body 10 and a lower positioning boss 11. The lower positioning boss 11 is disposed on the lower cover body 10, and a lower mold core 12 is disposed on the lower positioning boss 11. The upper pressing end cover 3 includes an upper cover body 30 and an upper positioning boss 31. The upper positioning boss 31 is disposed on the upper cover body 30, and an upper mold core 32 is disposed on the upper positioning boss 31. The two ends of the elastic mold body 2 are respectively fitted onto the lower positioning boss 11 and the upper positioning boss 31.

[0015] The outer diameters of the lower cover 10 and the upper cover 30 are the same as the outer diameter of the elastic mold 2.

[0016] The shapes of the lower mold core 12 and the upper mold core 32 are consistent with the shapes of the holes and grooves at both ends of the part to be processed.

[0017] The elastic mold 2 is a hollow sleeve structure, and its inner wall forms a cavity 4 with the lower positioning boss 11 and the upper positioning boss 31.

[0018] Both the lower end cap 1 and the upper end cap 3 are integrally formed.

[0019] The elastic mold 2 is made of polyurethane rubber.

[0020] The workflow is as follows: When using the mold, place the lower mold core 12 of the lower end cap 1 face up on the worktable. Then, fit one end of the elastic mold body 2 onto the lower positioning boss 11 of the lower end cap 1. Next, pour a certain weight of cemented carbide powder into the cavity 4 formed by the lower end cap 1 and the elastic mold body 2. Then, place the upper end cap 3 on the other end of the elastic mold body 2, and fit the upper positioning boss 31 of the upper end cap 3 onto the elastic mold body 2. Finally, move the entire mold containing the cemented carbide powder to the molding equipment. The upper part is molded. Under the radial extrusion of the molding machine, the elastic mold body 2 continuously shrinks and extrudes the cemented carbide powder inside, thereby forming a cemented carbide rod that is consistent with the internal cavity 4 of the mold. Then, the lower end cap 1, the elastic mold body 2, and the upper end cap 3 are separated to obtain a mold blank with the required center hole and threaded hole at both ends. Subsequent steps only require turning the outer circle and machining the thread, eliminating the need to machine the center hole and threaded hole. This optimizes the processing procedure, improves production efficiency, and reduces the consumption of cemented carbide powder.

[0021] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A dry-bag cold isostatic pressing die for pressing cemented carbide turning and shaping cutter blanks, characterized in that, The device includes a lower end cap (1), an elastic mold body (2), and a upper end cap (3). The lower end cap (1) includes a lower cover body (10) and a lower positioning boss (11). The lower positioning boss (11) is disposed on the lower cover body (10) and a lower mold core (12) is disposed on the lower positioning boss (11). The upper end cap (3) includes an upper cover body (30) and an upper positioning boss (31). The upper positioning boss (31) is disposed on the upper cover body (30) and an upper mold core (32) is disposed on the upper positioning boss (31). The two ends of the elastic mold body (2) are respectively fitted onto the lower positioning boss (11) and the upper positioning boss (31).

2. The dry-bag cold isostatic pressing mold for pressing cemented carbide turning and shaping cutter blanks according to claim 1, characterized in that, The outer diameters of the lower cover (10) and the upper cover (30) are the same as the outer diameter of the elastic mold (2).

3. The dry-bag cold isostatic pressing mold for pressing cemented carbide turning and shaping cutter blanks according to claim 1, characterized in that, The shapes of the lower mold core (12) and the upper mold core (32) are consistent with the shapes of the holes and grooves at both ends of the part to be processed.

4. The dry-bag cold isostatic pressing mold for pressing cemented carbide turning and shaping cutter blanks according to claim 1, characterized in that, The elastic mold (2) is a hollow sleeve structure, and its inner wall forms a cavity (4) with the lower positioning boss (11) and the upper positioning boss (31).

5. The dry-bag cold isostatic pressing mold for pressing cemented carbide turning and shaping cutter blanks according to claim 1, characterized in that, The lower end cap (1) and the upper end cap (3) are both integrally formed.

6. The dry-bag cold isostatic pressing mold for pressing cemented carbide turning and shaping cutter blanks according to claim 1, characterized in that, The elastic mold (2) is made of polyurethane rubber.

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