CN210359246U

CN210359246U - Demoulding mould for forming cold isostatic pressing tube blank

Info

Publication number: CN210359246U
Application number: CN201920658473.9U
Authority: CN
Inventors: 李培林; 文宏福
Original assignee: Dongguan Omat Puttering Target Co ltd; Shaoguan Oulai Hi Tech Material Co ltd
Current assignee: DONGGUAN OMAT PUTTERING TARGET Co.,Ltd.; Guangdong Oulai high tech materials Co.,Ltd.
Priority date: 2019-05-08
Filing date: 2019-05-08
Publication date: 2020-04-21
Anticipated expiration: 2029-05-08

Abstract

The utility model provides a demoulding mould for forming a cold isostatic pressing tube blank, which has simple and reliable structure and strong practicability; the demoulding process does not need any external force extrusion, the prepared hollow tube is uniform and complete, the inner wall is smooth and uniform, no crack or edge breakage defect exists, the uniform hollow tube blank with the large size of 100 plus 4000mm in length can be prepared, secondary processing and finishing are not needed, the repeated practical efficiency of the mould is higher, the operation is convenient and efficient, and the production efficiency is improved while the production cost is effectively reduced.

Description

Demoulding mould for forming cold isostatic pressing tube blank

Technical Field

The utility model relates to a powder metallurgy press forming's mould field, concretely relates to fashioned drawing of patterns mould of cold isostatic pressing pipe.

Background

The cold isostatic pressing technology is a powder material forming method, and its principle is that powder is packed in a mould capable of bearing deformation, and placed in a closed high-pressure container, so that it can be completely contacted with liquid in the container, and the powder body can be uniformly pressurized from all directions by utilizing the property of that the liquid medium can not be compressed and can uniformly transfer pressure, so that the powder body can be pressed and formed into compact blank body, and can be generally used in the field of ceramic powder metallurgy.

At present, a cylindrical jacket is adopted as a jacket forming die for preparing a hollow pipe blank by cold isostatic pressing, and a circular bar is adopted as an inner core. In the press forming process, because inside powder can produce very big stress and frictional force at radial and axial and inner core, cause inside powder can closely adhere to the pole surface of inner core, and the pipe inner wall is as an organic whole with the inner core adhesion after the shaping, can appear unable drawing of patterns phenomenon, especially to the pipe degree be greater than 2 meters pipe, consequently often need demould with the help of modes such as external force extrusion. But the demolding difficulty is very high in the later stage by virtue of demolding modes such as external force extrusion and the like, so that the defects of inner wall scratches, gravure, edge breakage and the like are easily caused after the product is demolded, the production procedures such as machining and finishing the inner wall are needed in the later stage, the procedures are complicated, and the production efficiency is reduced; in severe cases, the problems of demoulding and drawing crack, tube blank breakage and scrapping and the like can occur, which leads to the waste of manpower and resources and causes great loss.

SUMMERY OF THE UTILITY MODEL

For solving the above problem, the utility model provides a novel fashioned drawing of patterns mould of cold isostatic pressing pipe, this mould simple structure is reliable, and the practicality is strong, and the drawing of patterns process need not external force extrusion, can reduce crackle, gravure and collapse the production of limit isopiestic defect, and the wall smoothness is even in the base pipe of making.

The utility model discloses a reach above-mentioned purpose through following technical scheme:

a demoulding mould for forming a cold isostatic pressing tube blank comprises an inner core shaft, an outer sleeve and a bottom support; the inner core shaft is a solid column with taper; the outer sleeve is of a rigid hollow cylindrical structure; the bottom support is of a rigid cylindrical structure, and a plurality of flow guide holes are axially formed in the bottom support; the inner core shaft one end with collet detachably fixes the equipment, the overcoat cover is established outside inner core shaft and collet.

Compared with the prior art, the utility model provides a fashioned drawing of patterns mould of cold isostatic pressing pipe, it only needs to demolish the collet of bottom through setting up tapered inner core axle and detachable collet during the drawing of patterns, can take the inner core axle out, and the drawing of patterns process need not external force extrusion, and the hollow tube that makes is even complete, and the inner wall is smooth even, can effectively reduce crackle, gravure and collapse the production of limit defect.

Further, the inner mandrel both ends head with clearance between the overcoat adopts hollow circular plug to carry out tolerance fit and seals, and this structure can avoid taking place phenomenons such as infiltration in the forming process.

Furthermore, the inner core shaft is provided with chamfers at two ends, the chamfers are arranged at the upper end of the inner core shaft, so that the rubber plug can be conveniently assembled, and the chamfers are arranged at the lower end of the inner core shaft, so that the inner wall of the pipe blank can be prevented from being scratched by the bottom when the pipe blank is demolded.

Furthermore, a hanging ring is welded at the upper end of the inner mandrel, so that the large-size tube blank can be conveniently hoisted and demoulded;

furthermore, the inner mandrel is formed by sequentially connecting A, B sections and C sections from top to bottom; the section A is of a circular truncated cone-shaped structure and is of a structure with a small outer diameter at the upper end and a large outer diameter at the lower end; the section B is straight and has no taper; the section C is provided with a taper and has a structure with a large outer diameter at the upper end and a small outer diameter at the lower end; the hoisting ring is welded at the top end of the section A, so that the tube blank can be conveniently hoisted; the section B has no taper and is mainly used for ensuring the tolerance fit sealing of the large chamfer section sealing rubber plug; the C section is provided with a taper, so that demolding is facilitated.

Furthermore, a plurality of positioning screw holes are formed at the bottom end of the inner mandrel; the corresponding position of the inner core shaft positioning screw hole on the bottom support is provided with hole sites with corresponding number and size, so that the inner core shaft and the bottom support can be detachably fixed and assembled by screws.

Further, the outer surface of the mandrel is subjected to a round grinding and polishing treatment and is coated with a layer of release agent, so that the surface is smooth enough to facilitate the release.

Further, the taper of the mandrel is preferably 5-15 °.

Further, the mandrel, the base support and the outer sleeve are all made of steel.

The utility model provides an inner core mould of cold isostatic pressing hollow tube drawing of patterns, its simple structure is reliable, and the practicality is strong, through setting up the inner core axle that has the tapering and can dismantle the collet, further scribble the release agent on the inner core axle surface, the welding has rings at the top, makes the drawing of patterns process need not external force extrusion, and the smooth of blank pipe inner wall is even, can reduce the production of defects such as crackle and edge breakage, can make even length 100 and 4000 mm's jumbo size specification hollow tube, need not secondary operation and repair, practices thrift the process; the repeated practical efficiency of the die is higher, and the production cost is effectively reduced.

For a better understanding and an implementation, the present invention is described in detail below with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic view of the overall structure of a demoulding mould for forming a cold isostatic pressing tube blank according to the present invention;

fig. 2 is a schematic structural view of the inner mandrel of the present invention;

fig. 3 is a schematic view of the structure of the bottom bracket of the present invention.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.

Example 1

Referring to fig. 1, fig. 1 is a schematic view of the overall structure of a mold for forming a cold isostatic pressing tube blank according to the present invention.

The utility model provides a fashioned drawing of patterns mould of cold isostatic pressing pipe, it mainly comprises inner core axle 1, overcoat 2 and

collet

3, 1 bottom of inner core axle with the fixed equipment of 3 detachably of collet, 2 covers of overcoat are established including dabber 1 and collet 3 outside.

The inner mandrel 1 is made of No. 45 round steel, the surface of the inner mandrel 1 is subjected to cylindrical grinding and polishing treatment, and a layer of special release agent is coated on the surface of the inner mandrel 1, and a glycerol solution is preferably selected in the embodiment; the inner mandrel 1 has a certain taper, the taper is 5-15 degrees, the structure is characterized in that the outer diameter of the upper end is larger, the outer diameter of the lower end is smaller, and the taper can be adjusted according to the size of the prepared tube blank.

Specifically, please refer to fig. 2, fig. 2 is a schematic structural diagram of the inner core shaft 1 according to the present invention; the inner mandrel 1 consists of three parts from top to bottom, wherein the three parts are A, B, C sections respectively. The section A is of a circular truncated cone structure, has a structure with a small outer diameter at the upper end and a large outer diameter at the lower end, and has an inclined plane angle of 30-40 degrees and a length of 10-20 mm; the arrangement of the truncated cone type structure of the section A can facilitate the assembly of the upper end sealing rubber plug; meanwhile, the top of the section A of the inner core shaft 1 is also welded with a hanging ring 5, so that large-size pipe blanks can be conveniently hoisted and demoulded. The section B is straight and has no taper, the length of the section B is 100-200mm, and the section B is mainly used for ensuring the tolerance fit sealing of the upper end sealing rubber plug and avoiding the water seepage phenomenon in the pressing process; the taper of the taper section C is 5-15 degrees, the surface of the taper section C is subjected to cylindrical grinding and polishing treatment, the surface roughness Ra is less than or equal to 0.2, and demolding is facilitated. The processing of cone section C bottom has the chamfer, bottom to the fish tail of base inner wall when can avoiding the drawing of patterns. The length of the inner core shaft and the proportion of all sections in the total length can be adjusted according to the size of the manufactured tube blank.

The overcoat 2 is a rigidity hollow circular barrel column structure, preferably, overcoat 2 with clearance between 1 both ends of inner core axle adopts hollow circular plug 5 to carry out tolerance fit sealing, and this structure can avoid taking place phenomenons such as infiltration in the forming process.

Please refer to fig. 2, fig. 2 is a schematic diagram of the bottom support structure of the present invention; the bottom support 3 is made of a 304/A3 steel round steel plate with the thickness of 8-15mm, a plurality of flow guide holes 31 are axially and uniformly formed in the plate surface, the diameter of each flow guide hole is 5-10mm, so that liquid at the bottom can uniformly contact the bottom end of the outer sleeve when the powder is pressed, and the end powder blank is uniformly stressed. The collet 3 and the inner mandrel 1 are detachably fixed and assembled, specifically, a plurality of positioning screw holes (not shown) are arranged at the bottom end of the inner mandrel 1, the distances between the positioning screw holes are equal, the number of the positioning screw holes can be adjusted according to actual conditions, in the embodiment, the number of the positioning screw holes is 3, and the positioning screw holes are distributed in an equilateral triangle shape; the bottom support 3 plate is provided with positioning holes 32 with corresponding number and size corresponding to the positioning screw holes at the bottom end of the inner core shaft, the positioning holes are used for fixing the bottom support 3 and the inner core shaft 1 through screws, and the effects of bearing the whole powder blank and ensuring that a die does not slide are achieved.

When the die is used, the positioning screw hole of the inner core shaft 1 and the positioning hole of the bottom support 3 are screwed down by screws, the inner core shaft 1 and the bottom support 3 are assembled into an inner core die, and a release agent is coated on the surface of the inner core shaft 1; after assembly, the hollow circular rubber plug 5 is hoisted into the outer sleeve 2 and is packed with powder 4, then the hollow circular rubber plug 5 is plugged and tightened and sealed from the two ends of the inner mandrel 1, then the whole body is hoisted into a cold isostatic press to carry out cold isostatic pressing under the condition that the pressure is 150 plus 200MPa, only the screw and the bottom support 3 at the bottom end are needed to be disassembled during demoulding, and the upper end of the inner mandrel 1 is hoisted to naturally demould the large-size hollow tube blank.

The utility model provides a demoulding mould for forming a cold isostatic pressing tube blank, which has simple and reliable structure and strong practicability; the demoulding process does not need any external force extrusion, the defects of cracks, edge breakage and the like are avoided, the prepared hollow tube is uniform and complete, the inner wall is smooth and uniform, a uniform hollow tube blank (100 + 4000mm) with large size can be prepared, secondary processing and finishing are not needed, the repeated practical efficiency of the mould is higher, the operation is convenient and efficient, and the production efficiency is improved while the production cost is effectively reduced.

The present invention is not limited to the above embodiment, and if various modifications or variations of the present invention do not depart from the spirit and scope of the present invention, they are intended to be covered if they fall within the scope of the claims and the equivalent technology of the present invention.

Claims

1. The utility model provides a drawing of patterns mould of cold isostatic pressing pipe billet shaping which characterized in that: comprises an inner core shaft, an outer sleeve and a bottom support; the inner core shaft is a solid column with taper; the outer sleeve is of a rigid hollow cylindrical structure; the bottom support is of a rigid cylindrical structure, and a plurality of flow guide holes are axially formed in the bottom support; the inner core shaft one end with collet detachably fixes the equipment, the overcoat cover is established outside inner core shaft and collet.

2. The demoulding mould for forming the cold isostatic pressing tube blank according to claim 1, wherein: and the clearance between the two ends of the inner mandrel and the outer sleeve is sealed in a tolerance fit manner by adopting a hollow circular rubber plug.

3. The demoulding mould for forming the cold isostatic pressing tube blank according to claim 2, wherein: chamfers are arranged at two ends of the inner mandrel.

4. The demoulding mould for forming the cold isostatic pressing tube blank according to claim 3, wherein: and a hanging ring is welded at the upper end of the inner mandrel.

5. The demoulding mould for forming the cold isostatic pressing tube blank according to claim 1, wherein: the inner mandrel is formed by sequentially connecting A, B sections and C sections from top to bottom; the section A is of a circular truncated cone-shaped structure, and the outer diameter of the upper end of the section A is small, and the outer diameter of the lower end of the section A is large; the section B is straight and has no taper; the section C has a taper and is of a structure with a large outer diameter at the upper end and a small outer diameter at the lower end; the lifting ring is welded with the top end of the section A.

6. The demoulding mould for forming the cold isostatic pressing tube blank according to claim 1, wherein: a plurality of positioning screw holes are formed at the bottom end of the inner core shaft; and hole sites with corresponding number and size are arranged on the bottom support and at positions corresponding to the inner core shaft positioning screw holes.

7. The demoulding mould for forming the cold isostatic pressing tube blank according to claim 1, wherein: the outer surface of the mandrel is subjected to round grinding and polishing treatment, and a layer of release agent is coated on the outer surface of the mandrel.

8. The demoulding mould for forming the cold isostatic pressing tube blank according to claim 1, wherein: the taper of the mandrel is 5-15 degrees.

9. A demoulding mould for forming a cold isostatic pressing pipe blank according to any one of claims 1-8, characterised in that: the mandrel, the bottom support and the outer sleeve are all made of steel.