CN210359247U - Cold isostatic pressing pipe blank forming die - Google Patents
Cold isostatic pressing pipe blank forming die Download PDFInfo
- Publication number
- CN210359247U CN210359247U CN201920658514.4U CN201920658514U CN210359247U CN 210359247 U CN210359247 U CN 210359247U CN 201920658514 U CN201920658514 U CN 201920658514U CN 210359247 U CN210359247 U CN 210359247U
- Authority
- CN
- China
- Prior art keywords
- cold isostatic
- isostatic pressing
- forming die
- blank forming
- inner film
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Press-Shaping Or Shaping Using Conveyers (AREA)
- Press Drives And Press Lines (AREA)
Abstract
The utility model discloses a cold isostatic pressing pipe blank forming die, which can effectively avoid the phenomenon that the bottom is seriously piled, the density is too large and the local part is thick due to uneven deformation after pressing caused by the dead weight problem of powder after powder filling by arranging an inner die with a taper; the rubber plug is arranged to replace a conventional rubber sleeve for sealing, so that water seepage can be effectively avoided; and meanwhile, a rigid outer die is adopted, so that deformation and size of a later-stage pressed compact can be guaranteed while the inner film is not deformed in the process of charging and powder filling. The pipe body obtained by pressing the mould of the utility model has uniform and complete appearance, no eccentricity, no dumbbell shape or thick bottom, smooth inner wall, level two ends, and no need of secondary processing to finish the blank pipe; the pressing process has no water seepage phenomenon, the operation is convenient and efficient, the repeated utilization rate of the die is high, and the production efficiency is effectively improved while the pressed blank quality is ensured.
Description
Technical Field
The utility model relates to a powder metallurgy press forming's mould field, concretely relates to cold isostatic pressing pipe forming die.
Background
The cold isostatic pressing is a molding process, and is characterized in that powder is encapsulated in a mold, sealed and placed in a high-pressure container, and a liquid pressure medium is directly injected. The mould contacts with the liquid, and the powder is uniformly pressurized from all directions by utilizing the property that the liquid medium can not be compressed and can uniformly transfer pressure, so that the powder is pressed and formed into a compact blank.
At present, most of cold isostatic pressing hollow long tube blanks adopt a cylindrical rubber sleeve as a mould, and the rubber sleeve is soft, so that the rubber sleeve can deform unevenly after powder loading and compaction, the phenomenon of large local density difference is easy to occur, the tube blank has poor forming effect and uneven excircle deformation after cold isostatic pressing, eccentricity exists, the tube blank is dumbbell-shaped, and the eccentricity is particularly appeared at the lower end of the tube blank; meanwhile, as the powder is influenced by gravity when being filled with powder, the relative bulk density is large, the lower end part shows that the pipe diameter is thick after being pressed, and further processing and trimming are needed in the later period, thereby increasing the production procedures and causing the waste of raw materials. In addition, the conventional rubber sleeve sealing structure needs to be sealed by glue, the water seepage phenomenon often occurs in the cold isostatic pressing process, and the glue can cause secondary pollution of powder, thereby seriously affecting the product quality.
SUMMERY OF THE UTILITY MODEL
The utility model provides a to the not enough of above-mentioned prior art, the utility model provides a novel cold isostatic pressing pipe forming die, its structure is reliable and the practicality is strong, can suppress out the texture evenly, the intact jumbo size specification hollow tube of appearance, has avoided using the sealed risk of pollution powder and the infiltration that exists of conventional glue simultaneously.
The invention is realized by the following technical scheme:
the utility model provides a cold isostatic pressing pipe billet forming die which characterized in that: the inner mold comprises a mandrel, an inner film and an outer mold from inside to outside in sequence; the mandrel is a solid round bar with taper; the inner film is a soft rubber sleeve with taper; the gap between the inner film and the two ends of the mandrel is sealed in a tolerance fit manner by adopting a hollow circular rubber plug; the outer mold is a rigid hollow cylinder, is sleeved outside the inner film and is provided with a plurality of flow guide holes on the surface.
Compared with the prior art, the inner film rubber sleeve of the cold isostatic pressing tube blank forming die provided by the utility model has the taper, so that the phenomenon that the bottom is seriously stacked, the density is too large and the local part is thick due to uneven deformation after pressing caused by the dead weight problem of powder after powder loading can be effectively avoided; the risk of leakage and water seepage is avoided by the arrangement of the rubber plug; meanwhile, a rigid outer die is adopted, so that deformation and size of a later-stage pressed blank can be guaranteed while the inner film is not deformed in the process of charging and powder filling; the tube blank prepared by the die has uniform texture, complete appearance and high product quality.
Preferably, the mandrel is made of steel, the steel has rigidity capable of fixing the inner film and controlling the inner film not to deform in the charging and powder filling processes, and meanwhile, the deformation amount and the size of the later-period pressed compact are guaranteed.
Preferably, the surface roughness Ra of the mandrel is not more than 0.4, and the smaller roughness of the surface of the mandrel can facilitate the demolding of the product.
Preferably, the inner film is a polyurethane or chloroprene rubber product, and has high elasticity and strength, excellent wear resistance and good waterproof and moistureproof effects.
Preferably, the wall thickness of the inner membrane is 8-20 mm.
Preferably, the taper of the inner film rubber sleeve is 3-15 mm.
Preferably, the outer diameter of the hollow circular rubber plug is 5-10mm larger than the inner diameter of the inner membrane rubber sleeve, and the inner diameter of the hollow circular rubber plug is 3-8mm smaller than the outer diameter of the inner core shaft.
Preferably, the hollow circular rubber plug at the upper end is of a circular ring structure, a coaxial circular ring bulge is arranged at the position of an inner hole of the hollow circular rubber plug, the height of the circular ring bulge is 8-20mm, and the thickness of the circular ring bulge is 3-8 mm; the arrangement can effectively avoid the phenomenon of leakage and water seepage caused by the slippage of the rubber plug along the direction of the mandrel under the external pressure in the cold isostatic pressing process.
Preferably, a plurality of flow guide holes are uniformly formed in the surface of the outer die at equal intervals; the diameter of the diversion hole is 10-30 mm; the arrangement of the flow guide holes ensures that the pressure can be uniformly transmitted to the inner film during the cold isostatic pressing, ensures that all points of the inner film are uniformly stressed in the pressing process, and ensures the density uniformity and the size precision of the pressed pipe blank.
Preferably, the outer die has a thickness of 5-15 mm.
Compared with the prior art, use the body appearance that the mould suppression obtained evenly is complete, do not have eccentric, dumbbell shape or the thick equal deformation uneven phenomenon in bottom, the inner wall is smooth, both ends head parallel and level need not to carry out secondary operation and repaiies the base pipe. Through verifying many times, this utility model mould pressing process does not have the infiltration phenomenon, and the mould uses the simple operation high efficiency, and reuse rate is high, has improved production efficiency when guaranteeing the pressed compact quality effectively.
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 diagram of the inner membrane and components of the present invention;
figure 2 is the utility model discloses a cold isostatic pressing pipe forming die assembles the picture.
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 and fig. 2, fig. 1 is a diagram of the inner film and the assembly of the present invention, and fig. 2 is an assembly diagram of the cold isostatic pressing tube blank forming mold of the present invention.
The wet cold isostatic pressing die comprises a mandrel 1, an inner film 2 and an outer die 3 from inside to outside.
The mandrel 1 is a 45# steel solid round bar, the surface roughness Ra of the mandrel is less than or equal to 0.4, the taper is that the difference between the outer diameters of the upper end and the lower end is 2-10mm, and the difference can be adjusted according to the size of a product.
The inner film 2 is a soft rubber sleeve with taper, and is made of polyurethane, chloroprene rubber products or other materials with high elasticity, strength, wear resistance, water resistance and moisture resistance. The inner film is of a structure with a small inner diameter at the lower end and a large inner diameter at the upper end, the wall thickness of the inner film is preferably 8-20mm, the taper is that the difference value of the inner diameters of the upper end and the lower end is 3-15mm, a gap between the inner film and the two ends of the mandrel is sealed in a tolerance fit mode through a hollow circular rubber plug, and the hollow circular rubber plug comprises an upper rubber plug 4 and a lower rubber plug 5.
The height of the upper rubber plug 4 is 100-200mm, the inner diameter of the upper rubber plug is 3-8mm smaller than the outer diameter of the upper end of the mandrel, and the outer diameter of the upper rubber plug is 5-10mm larger than the inner diameter of the upper end of the inner film. Preferably, one end of the upper rubber plug 4 is provided with a coaxial circular ring bulge, the height of the circular ring bulge is 8-20mm, the wall thickness is 3-8mm, and the circular ring is tightly attached to the mandrel. The height of the lower rubber plug 5 is 100-200mm, the inner diameter of the lower rubber plug is 3-8mm smaller than the outer diameter of the bottom end of the mandrel, and the outer diameter of the lower rubber plug is 5-10mm larger than the inner diameter of the inner film at the bottom end.
The outer die 3 is a rigid hollow cylinder, specifically is a barrel made of 304 or 316 stainless steel, the wall thickness of the barrel is 5-15mm, and the gap between the inner wall of the outer die and the outer wall of the inner film is 1-3 mm. The surface of the outer die is uniformly provided with a plurality of round holes with the diameter of 10-30 mm.
When the rubber plug is used, the smaller end of the outer diameter of the mandrel is inserted into the inner hole of the lower rubber plug, the inner film is sleeved into the mandrel, the smaller end of the inner diameter of the inner film is tightly matched and sleeved with the lower rubber plug, and the outer part of the smaller end of the inner diameter of the inner film is tightly tied by a tightening hoop so that the inner film and the lower rubber plug are sealed and fastened.
And secondly, hoisting the assembled inner film and the mandrel into an outer die, fixing and controlling the inner film not to deform in the process of charging and powder filling by using the rigidity of the outer die, and simultaneously ensuring the deformation and the size of a later-stage pressed blank. And then, filling powder into the inner membrane cavity, starting the vibration platform to tamp the powder, and tamping the powder uniformly after the powder is filled in the required inner membrane cavity space. And sleeving the upper rubber plug into the upper end of the mandrel and the inner film until the rubber plug is tightly attached to the powder position, and respectively tightening the circular bulge of the hollow circular rubber plug at the upper end and the excircle of the inner film by using a tightening hoop so as to seal and fasten the inner film at the upper end, the upper rubber plug and the mandrel. The rubber plug can be effectively prevented from sliding along the direction of the mandrel under the action of external pressure in the cold isostatic pressing process through the arrangement of the upper rubber plug and the lower rubber plug and the tightening operation, so that the leakage and water seepage phenomena are caused.
And putting the whole assembled compact die into a cold isostatic press for pressing under the pressure conditions of 160-230 MPa. And during cold isostatic pressing, the pressure can be uniformly transmitted to the inner film through the flow guide holes of the outer die, so that the uniform stress of each point of the inner film in the pressing process is ensured, and the density uniformity and the size precision of the pressed pipe blank are ensured. And after pressing is finished, disassembling the stainless steel outer mold and the rubber plug, lifting out the mandrel, and demolding to obtain the hollow long tube with the required specification.
The inner film rubber sleeve of the cold isostatic pressing tube blank forming die provided by the utility model has conicity, which can effectively avoid the phenomenon that the bottom is seriously piled, the density is too high and the local part is thick due to uneven deformation after pressing caused by the dead weight problem of powder after powder loading; the risk of leakage and water seepage is avoided by the arrangement of the rubber plug; meanwhile, a rigid outer die is adopted, so that deformation and size of a later-stage pressed blank can be guaranteed while the inner film is not deformed in the process of charging and powder filling; the tube blank prepared by the die has the advantages of uniform texture, complete appearance, high product quality, no eccentric deformation, dumbbell shape or uneven deformation such as thick bottom, smooth inner wall and level two ends, and does not need to be subjected to secondary processing to trim the tube blank. Through verifying many times, this utility model mould pressing process does not have the infiltration phenomenon, and the mould uses the simple operation high efficiency, and reuse rate is high, has improved production efficiency when guaranteeing the pressed compact quality effectively.
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 (10)
1. The utility model provides a cold isostatic pressing pipe billet forming die which characterized in that: the inner mold comprises a mandrel, an inner film and an outer mold from inside to outside in sequence; the mandrel is a solid round bar with taper; the inner film is a soft rubber sleeve with taper; the gap between the inner film and the two ends of the mandrel is sealed in a tolerance fit manner by adopting a hollow circular rubber plug; the outer mold is a rigid hollow cylinder, is sleeved outside the inner film and is provided with a plurality of flow guide holes on the surface.
2. The cold isostatic pressing tube blank forming die according to claim 1, wherein: the mandrel is a steel part.
3. The cold isostatic pressing tube blank forming die according to claim 2, wherein: the surface roughness Ra of the mandrel is not more than 0.4.
4. The cold isostatic pressing tube blank forming die according to claim 1, wherein: the inner film is made of polyurethane or chloroprene rubber.
5. The cold isostatic pressing tube blank forming die according to claim 4, wherein: the wall thickness of the inner membrane is 8-20 mm.
6. The cold isostatic pressing tube blank forming die according to claim 5, wherein: the conicity of the inner film is 3-15 mm.
7. The cold isostatic pressing tube blank forming die according to claim 1, wherein: the outer diameter of the hollow circular rubber plug is 5-10mm larger than the inner diameter of the inner film rubber sleeve, and the inner diameter of the hollow circular rubber plug is 3-8mm smaller than the outer diameter of the inner core shaft.
8. The cold isostatic pressing tube blank forming die according to claim 7, wherein: the hollow circular rubber plug at the upper end is of a circular ring structure, the inner hole position of the hollow circular rubber plug is provided with a coaxial circular ring bulge, the height of the circular ring bulge is 8-20mm, and the thickness of the circular ring bulge is 3-8 mm.
9. The cold isostatic pressing tube blank forming die according to claim 1, wherein: a plurality of flow guide holes are uniformly formed in the surface of the outer die at equal intervals; the diameter of the diversion hole is 10-30 mm.
10. The cold isostatic pressing tube blank forming die according to claim 9, wherein: the thickness of the outer die is 5-15 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920658514.4U CN210359247U (en) | 2019-05-08 | 2019-05-08 | Cold isostatic pressing pipe blank forming die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920658514.4U CN210359247U (en) | 2019-05-08 | 2019-05-08 | Cold isostatic pressing pipe blank forming die |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210359247U true CN210359247U (en) | 2020-04-21 |
Family
ID=70259645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920658514.4U Active CN210359247U (en) | 2019-05-08 | 2019-05-08 | Cold isostatic pressing pipe blank forming die |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210359247U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111545761A (en) * | 2020-05-08 | 2020-08-18 | 山东威尔斯通钨业有限公司 | Preparation method of tungsten-copper alloy with elongated hole |
| CN111906316A (en) * | 2020-08-12 | 2020-11-10 | 山东威尔斯通钨业有限公司 | Manufacturing method and pressing die for large annular powder metallurgy material green body |
| CN112060667A (en) * | 2020-08-13 | 2020-12-11 | 四川士达特种炭材有限公司 | Cold isostatic pressing barrel material forming die |
| CN113024229A (en) * | 2021-03-02 | 2021-06-25 | 山东硅元新型材料股份有限公司 | Preparation method of alumina ceramic guide rail |
| CN114523107A (en) * | 2022-02-25 | 2022-05-24 | 东莞信柏结构陶瓷股份有限公司 | Profiling green body powder forming die |
-
2019
- 2019-05-08 CN CN201920658514.4U patent/CN210359247U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111545761A (en) * | 2020-05-08 | 2020-08-18 | 山东威尔斯通钨业有限公司 | Preparation method of tungsten-copper alloy with elongated hole |
| CN111906316A (en) * | 2020-08-12 | 2020-11-10 | 山东威尔斯通钨业有限公司 | Manufacturing method and pressing die for large annular powder metallurgy material green body |
| CN112060667A (en) * | 2020-08-13 | 2020-12-11 | 四川士达特种炭材有限公司 | Cold isostatic pressing barrel material forming die |
| CN113024229A (en) * | 2021-03-02 | 2021-06-25 | 山东硅元新型材料股份有限公司 | Preparation method of alumina ceramic guide rail |
| CN114523107A (en) * | 2022-02-25 | 2022-05-24 | 东莞信柏结构陶瓷股份有限公司 | Profiling green body powder forming die |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN210359247U (en) | Cold isostatic pressing pipe blank forming die | |
| CN207983642U (en) | A kind of two-way compacting tool set of easily demoulding tubular blank | |
| CN109158458A (en) | A method of pipe liquid filled press-bending is carried out using composite filled medium | |
| CN201132215Y (en) | Isostatic cool pressing forming die for filter tube with closing end | |
| CN211708103U (en) | Titanium-aluminum series alloy thin-wall hollow part cold isostatic pressing forming die | |
| US20100086429A1 (en) | Thin walled powder metal component manufacturing | |
| CN201645646U (en) | Cold isostatic pressing forming mould for preparing Na-beta-Al2O3 ceramic tube with one end closed | |
| CN110814337A (en) | Simple low-cost cold isostatic pressing die and implementation method thereof | |
| CN104543062B (en) | A kind of mould of post tea | |
| CN108644490A (en) | A kind of steel lining polytetrafluoroethylene (PTFE) straight tube and its mould pressing process | |
| CN208687137U (en) | A kind of steel lining polytetrafluoroethylene (PTFE) straight tube | |
| CN111906316B (en) | Manufacturing method and pressing die for large annular powder metallurgy material green body | |
| CN109128155B (en) | Method for manufacturing blind pipe by powder metallurgy isostatic pressing | |
| CN211250544U (en) | External isobaric forming die structure | |
| CN206811135U (en) | Assembling die for the production of hard alloy micropore heterotype tubing | |
| CN216065533U (en) | Tungsten or molybdenum crucible isostatic compaction mould | |
| CN208687205U (en) | A kind of steel lining polytetrafluoroethylene (PTFE) bend pipe | |
| CN105346136B (en) | Axial pressurization liquid plastic isostatic pressing die | |
| CN204482893U (en) | A kind of mould of post tea | |
| CN109203183B (en) | Isostatic pressing method and mould for ceramic pot liner | |
| CN211101600U (en) | Cold isostatic compaction mould for shaped charge liner pressed compact | |
| CN208687201U (en) | A kind of steel lining polytetrafluoroethylene tee | |
| CN108644515A (en) | A kind of steel lining polytetrafluoroethylene (PTFE) bend pipe and its mould pressing process | |
| CN216065534U (en) | Isostatic compaction mould for tubular parts | |
| CN217751915U (en) | Isostatic compaction mould for preparing ceramic with blind holes |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 512026 Yangshan village committee, Xilian Town, Wujiang District, Shaoguan City, Guangdong Province Patentee after: Guangdong Oulai high tech materials Co.,Ltd. Patentee after: DONGGUAN OMAT PUTTERING TARGET Co.,Ltd. Address before: 512000 Guangdong city in Shaoguan Province, Wujiang District Mu Creek Industrial Park Yangshan Area Patentee before: SHAOGUAN OULAI HI-TECH MATERIAL Co.,Ltd. Patentee before: DONGGUAN OMAT PUTTERING TARGET Co.,Ltd. |