TWM668240U - Powder Compression Molding Device - Google Patents

Abstract

A powder compression molding device includes a shell unit and a pressurizing unit arranged in the shell unit. The shell unit surrounds a containing space and has a flow channel connected to the containing space. The pressurizing unit is arranged in the containing space and includes an inner tube and an elastic film surrounding the outer side of the inner tube. The inner tube surrounds a fluid space, and the fluid space is connected to the flow channel of the shell unit. By arranging the elastic film on the outer side of the inner tube, the powder is pushed outward when compressed, so the fluid and the powder move in the same direction, which can save more effort. After being compressed, the powder contacts the outer shell unit, and the surface is smoother, reducing subsequent processing procedures and costs.

Description

Powder Compression Molding Device

This invention relates to a compression device, in particular to a powder compression molding device.

Powder metallurgy is a processing method that uses metal powder as raw material to make various products through pressing and sintering. The powder metallurgy process includes three main steps. First, the main component materials are broken down into powders of a certain size; then, the powder is loaded into the cavity of the mold and a certain pressure is applied to form a compact with the required part shape and size; finally, the compact is sintered.

Isostatic pressing is a technology that applies pressure uniformly to a sealed container containing compacted metal powder to achieve the purpose of component forming. Isostatic pressing can be performed at high temperature or ambient temperature, which are respectively called hot isostatic pressing (HIP) or cold isostatic pressing (CIP). Hot isostatic pressing can be used to directly manufacture metal components or to densify products produced by other powder metallurgy processes. Isostatic pressing technology was first applied to the field of metal forming and gradually extended to metal composites and non-metallic materials.

Compared with the commonly used pressing and sintering methods, isostatic pressing has the advantages of uniform pressure in all directions and more uniform density of the final component. However, like other powder metallurgy processes, the characteristics of various powders must be carefully understood during manufacturing to ensure the success of isostatic pressing. Existing isostatic pressing equipment still has room for improvement in terms of applicability to various types of powders.

The purpose of this invention is to provide a powder compression molding device that is more suitable for fluoropolymers.

The invention discloses a powder compression molding device, comprising a shell unit and a pressure unit disposed in the shell unit. The shell unit surrounds a containing space and has a flow channel connected to the containing space. The pressure unit is disposed in the containing space and comprises an inner tube and an elastic film surrounding the outer side of the inner tube. The inner tube surrounds a fluid space, and the fluid space is connected to the flow channel of the shell unit.

Another feature of the invention is that the outer shell unit includes an outer tube and a base disposed below the outer tube, the outer tube and the base together surround the accommodating space, and the flow channel is formed in the base.

Another feature of the invention is that the outer shell unit further includes a top cover disposed above the outer tube to seal the accommodating space.

Another feature of the invention is that the pressurizing unit further includes a supporting tube disposed between the inner tube and the elastic membrane, the upper and lower ends of the elastic membrane are fixed on the supporting tube, and the remaining unfixed portion can move outward relative to the supporting tube.

Another feature of this invention is that the supporting tube has a plurality of transversely penetrating holes.

Another feature of the invention is that the outer tube is a metal tube and the inner circumference of the outer tube is a smooth surface.

Another feature of the invention is that the inner tube is a mesh tube structure that allows fluid to pass through.

The effectiveness of this invention lies in that, by setting the elastic membrane on the outer side of the inner tube, the powder is pushed outward when compressed, so the fluid and the powder move in the same direction, which can save more effort. After the powder is compressed, it contacts the outer shell unit, and the surface is smoother, reducing subsequent processing procedures and costs.

The following is a detailed description of the preferred embodiments of the invention in conjunction with the attached drawings, so that the advantages and features of the invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the scope of protection of the invention. Before proceeding with the detailed description, it should be noted that similar components are represented by the same number. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front, back, bottom, top, etc., are only referenced to the directions of the attached drawings. Therefore, the directional terms used are for illustration, not for limiting the invention.

Referring to FIG. 1 , a preferred embodiment of the present invention's powder compression molding device includes a housing unit 2 and a pressurizing unit 3 disposed in the housing unit 2 . The housing unit 2 surrounds a containing space 201 and has a flow channel 202 communicating with the containing space 201 . In more detail, the housing unit 2 includes an outer tube 21, a base 22 disposed below the outer tube 21, and a top cover 23 disposed above the outer tube 21. The outer tube 21 and the base 22 together surround the accommodating space 201. The top cover 23 is used to seal the accommodating space 201, and the flow channel 202 is formed in the base 22 to connect the outside with the accommodating space 201.

The pressurizing unit 3 is disposed in the accommodating space 201 and includes an inner tube 31, a supporting tube 32 disposed outside the inner tube 31, and an elastic membrane 33 surrounding the outer side of the supporting tube 32. In other words, the supporting tube 32 is located between the inner tube 31 and the elastic membrane 33. The inner tube 31 surrounds a fluid space 311, and the fluid space 311 is connected to the flow channel 202 of the housing unit 2.

The outer tube 21 is a metal tube, and the inner circumference of the outer tube 21 is a smooth surface. The inner tube 31 is a mesh tube structure, which can allow fluid to pass through. The support tube 32 has a plurality of transverse through holes (not shown), which can also allow fluid to pass through. When using this invention, first open the top cover 23, install the pressurizing unit 3 on the base 22 and locate it in the accommodating space 201, then fill the powder in the space between the outer tube 21 and the pressurizing unit 3, and finally cover the top cover 23 and apply appropriate pressure to seal it.

Next, as shown in FIG. 2 , the fluid is allowed to pass through the flow channel 202 and enter the fluid space 311 surrounded by the inner tube 31. Since the inner tube 31 is a mesh tube structure and the support tube 32 is formed with perforations, the fluid will continue to pass through the inner tube 31 and the support tube 32 and then push the elastic membrane 33 outward. Since the upper and lower ends of the elastic membrane 33 are fixed to the support tube 32, the remaining unfixed portion can move outward relative to the support tube 32. Therefore, after being pushed by the fluid, the elastic membrane 33 will move toward the outer tube 21, so that the elastic membrane 33 will press the filled powder onto the inner wall surface of the outer tube 21. After the compression process is completed, the fluid is discharged and the elastic membrane 33 is restored to the position shown in FIG. 1 , and the top cover 23 can be opened to take out the embryo formed by the compacted powder.

Compared with the compression molding method of applying pressure from the outside to the inside, this invention adopts the method of applying pressure from the inside to the outside, which can reduce the volume of the entire device. In addition, by setting the elastic membrane 33 on the outer side of the inner tube 31, the powder is pushed outward when compressed, so the flow direction of the fluid is the same as the movement direction of the powder, which can save more effort. After the powder is compressed, it contacts the outer tube 21 of the shell unit 2. The outer tube 21 is a metal tube with a smooth inner surface, so that the surface of the embryo after the powder is compressed is smoother, reducing the chance of needing grinding, and reducing subsequent processing procedures and costs. The applicant has verified through experiments that the invention is more suitable for the compression of polytetrafluoroethylene (PTFE) powder.

From the above description, it can be seen that the powder compression molding device of the present invention, by setting the elastic membrane 33 on the outer side of the inner tube 31, makes the powder be pushed outward when compressed, so that the fluid and the powder move in the same direction, which can save more effort, and the powder is in contact with the outer shell unit 2 after being compressed, and the surface is smoother, reducing the subsequent processing procedures and costs.

The above implementation methods are only for illustrating the technical concept and features of this creation. Their purpose is to allow people familiar with this technology to understand the content of this creation and implement it. It cannot be used to limit the scope of protection of this creation. Any equivalent changes or modifications made according to the spirit and essence of this creation should be included in the scope of protection of this creation.

2: Shell unit 201: Accommodation space 202: Flow channel 21: Outer tube 22: Base 23: Top cover 3: Pressurization unit 31: Inner tube 311: Fluid space 32: Support tube 33: Elastic membrane

FIG1 is a schematic diagram illustrating a preferred embodiment of the powder compression molding device of the present invention; and FIG2 is a schematic diagram illustrating the use state of the preferred embodiment.

2: Housing unit

201: Storage space

202: Runner

21: External pipe

22: Base

23: Top cover

3: Pressurization unit

31: Inner tube

311: Fluid Space

32: Support tube

33: Elastic membrane

Claims (7)

A powder compression molding device comprises: a shell unit, which surrounds a containing space and has a flow channel connected to the containing space; a pressurizing unit, which is arranged in the containing space and includes an inner tube and an elastic film surrounding the outer side of the inner tube, the inner tube surrounds a fluid space, and the fluid space is connected to the flow channel of the shell unit. A powder compression molding device as described in claim 1, wherein the outer shell unit includes an outer tube and a base disposed below the outer tube, the outer tube and the base together surround the accommodating space, and the flow channel is formed in the base. A powder compression molding device as described in claim 2, wherein the outer shell unit further includes a top cover disposed above the outer tube to seal the accommodating space. A powder compression molding device as described in claim 1, wherein the pressurizing unit further includes a supporting tube disposed between the inner tube and the elastic membrane, the upper and lower ends of the elastic membrane are fixed on the supporting tube, and the remaining unfixed portion can move outward relative to the supporting tube. A powder compression molding device as described in claim 4, wherein the support tube has a plurality of transversely penetrating through holes. A powder compression molding device as described in claim 2, wherein the outer tube is a metal tube and the inner circumference of the outer tube is a smooth surface. A powder compression molding device as described in claim 1, wherein the inner tube is a mesh tube structure that allows fluid to pass through.

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