CN102554226B - Powder metallurgy pressing mould base - Google Patents
Powder metallurgy pressing mould base Download PDFInfo
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- CN102554226B CN102554226B CN 201210046897 CN201210046897A CN102554226B CN 102554226 B CN102554226 B CN 102554226B CN 201210046897 CN201210046897 CN 201210046897 CN 201210046897 A CN201210046897 A CN 201210046897A CN 102554226 B CN102554226 B CN 102554226B
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- seal closure
- mould
- mould bases
- upper punch
- rebound
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Abstract
The invention relates to a powder metallurgy pressing mould base, which comprises an upper mould plate, a female mould plate, an upper punch, a female mould and a lower punch. The powder metallurgy pressing mould base is characterized in that a device capable of vacuumizing a mould cavity in pressing is arranged on the mould base and comprises a sealing cover and a vacuum pump, the sealing cover in sliding fit with the upper punch is arranged outside the upper punch, an air guide channel connected with the vacuum pump is arranged on the lower end face of the sealing cover, and a pressing mechanism for tightly attaching the sealing cover to the upper end face of the female mould of the mould base is mounted on the sealing cover and leads the air guide channel to be communicated with the mould cavity. During pressing, the vacuum pump of the mould cavity vacuumizing device is used for vacuumizing the mould cavity through the air guide channel, air in powder inside the mould cavity is pumped out, internal or external defects of products due to air can be effectively prevented, and product pressing quality is improved.
Description
Technical field
The present invention relates to a kind of powder metallurgy pressing shaping mould bases, the powder metallurgy pressing shaping mould bases that particularly a kind of exhaust is thorough, pressing result can reduce product defects well.
Background technology
Powder metallurgy be produce metal or with metal dust (or mixture of metal dust and non-metal powder) as raw material, through having press or shaping without pressure after again by sintering, make the technology of metal material, compound and all kinds goods.Unique chemical is formed and mechanical, physical property because PM technique has, and these performances are can't obtain with traditional casting method.It has become the key that solves the new material problem, plays a part very important in the development of new material.
The necessity of exhaust in the powder pressing technology: in the pulverulent product press forming, if untimely with the gas discharge, then influence the pulverulent product quality that is shaped.Significantly cracking, disconnected base phenomenon easily directly appear in the ceramic powders goods that for example, intensity is lower when compacting; There is the micro-crack that is difficult for discovering in the pulverulent product of moderate strength, and flows into next procedure, and loss further improves, and processing cost and cycle all increase; The higher pulverulent product of intensity is at the no obvious crackle of compacting, and when gases are heated, they expand in the powder during sintering, cracks.
The backhaul exhaust is all adopted in powder compaction exhaust at present, i.e. the descending compacting of upper punch, and up backhaul exhaust then, descending compacting again, up backhaul exhaust again realizes so repeatedly.The shortcoming of this kind method is: equipment vibrations, impact are greatly; And have the part air to be pressed in the powder again during descending compacting again, exhaust is not thorough.
Summary of the invention
The technical problem to be solved in the present invention provides the powder metallurgy pressing shaping mould bases that a kind of exhaust is thorough, pressing result can reduce product defects well.
For solving the problems of the technologies described above, technical scheme of the present invention is: a kind of powder metallurgy pressing shaping mould bases, comprise cope match-plate pattern, negative template, upper punch, former and the Xia Chong of mould bases, its innovative point is: described mould bases is provided with the device that can vacuumize die cavity when compacting.
Further, described die cavity vacuum extractor comprises seal closure and vavuum pump, described upper punch is outside equipped with the seal closure that is slidingly matched with it, the lower surface of described seal closure is provided with the air guide channel that is connected with vavuum pump, is equipped with on the described seal closure when compacting seal closure is close to mould bases former upper surface and is made the hold-down mechanism that air guide channel is communicated with die cavity.
Further, described hold-down mechanism is the back-moving spring that is installed between mould bases cope match-plate pattern and the seal closure.
Further, be provided with hermetically-sealed construction between described seal closure and the upper punch.
Further, be provided with hermetically-sealed construction between described seal closure and the former.
Further, described former and under be provided with hermetically-sealed construction between dashing.
The invention has the advantages that: in pressing process, the vavuum pump of die cavity vacuum extractor vacuumizes die cavity by air guide channel, extract the air that contains in the die cavity powder out, can prevent effectively that product from because air produces inherent or external defective, having improved the compacting quality of product.
Description of drawings
Fig. 1 is powder metallurgy pressing shaping mould bases example structure schematic diagram of the present invention.
The specific embodiment
As described in Figure 1, mould bases comprises cope match-plate pattern 1, negative template 2, installs on the cope match-plate pattern 1 and dashes 3, and former 4 is installed on the negative template 2, installs on the fixed head down and dashes 5.
Also be provided with the device that can vacuumize die cavity when compacting on the above-mentioned mould bases, it comprises seal closure and vavuum pump.Seal closure is located at outside the upper punch, and is slidingly matched with upper punch, and the lower surface of seal closure has cannelure as air guide channel, and this air guide channel is communicated with vavuum pump.
Be equipped with on the seal closure when compacting seal closure is close to mould bases former upper surface and is made the hold-down mechanism that air guide channel is communicated with die cavity.In the present embodiment, this hold-down mechanism is back-moving spring 71 and the spring base 72 that is installed between mould bases cope match-plate pattern and the seal closure.
For raising vacuumizes effect, in corresponding position hermetically-sealed construction is set all.Between seal closure and upper punch, be provided with hermetically-sealed construction, concrete: seal closure is made up of last rebound 61 and following rebound 62 bolts in the present embodiment, at the last rebound 61 external screw thread hollow stud 63 that is threaded, these hollow stud 63 lower ends prop up down rebound 62 upper surfaces, be provided with O-ring seals 81 between hollow stud 63 and the following rebound 62, the inner ring of O-ring seals 81 is close to upper punch 3.Except O-ring seals 81, also can install pad 64, fluid sealant etc. additional and further improve sealing property.
Be provided with hermetically-sealed construction between the following rebound 62 of seal closure and the former 4, concrete: as in following rebound 62 lower surfaces O-ring seals 82 to be set.Former 4 and down dash 5 between be provided with hermetically-sealed construction, concrete, O-ring seals 83 are installed dashing 5 down.
Operation principle:
During compacting, cope match-plate pattern 1 drive upper punch 3 and seal closure are descending, and after the seal closure lower surface propped up former 4 upper surfaces, upper punch 3 can continue descending the compacting, seal closure and upper punch, former, the following cavity that constitutes a sealing that dashes are extracted out the air in the die cavity by vavuum pump.
Claims (1)
1. powder metallurgy pressing shaping mould bases comprises cope match-plate pattern, negative template, upper punch, former and the Xia Chong of mould bases, and it is characterized in that: described mould bases is provided with the device that can vacuumize die cavity when compacting; Described die cavity vacuum extractor comprises seal closure and vavuum pump, described upper punch is outside equipped with the seal closure that is slidingly matched with it, the lower surface of described seal closure is provided with the air guide channel that is connected with vavuum pump, is equipped with on the described seal closure when compacting seal closure is close to mould bases former upper surface and is made the hold-down mechanism that air guide channel is communicated with die cavity; Be provided with hermetically-sealed construction between described seal closure and the upper punch, seal closure is made up of last rebound and following rebound bolt, at the last rebound external screw thread hollow stud that is threaded, this hollow stud lower end props up down the rebound upper surface, be provided with O-ring seals between hollow stud and the following rebound, the inner ring of O-ring seals is close to upper punch; Described hold-down mechanism is the back-moving spring that is installed between mould bases cope match-plate pattern and the seal closure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210046897 CN102554226B (en) | 2012-02-28 | 2012-02-28 | Powder metallurgy pressing mould base |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210046897 CN102554226B (en) | 2012-02-28 | 2012-02-28 | Powder metallurgy pressing mould base |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102554226A CN102554226A (en) | 2012-07-11 |
| CN102554226B true CN102554226B (en) | 2013-07-10 |
Family
ID=46401591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201210046897 Expired - Fee Related CN102554226B (en) | 2012-02-28 | 2012-02-28 | Powder metallurgy pressing mould base |
Country Status (1)
| Country | Link |
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| CN (1) | CN102554226B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102773477A (en) * | 2012-08-16 | 2012-11-14 | 俞红霞 | Vacuumizing forming device and method of magnetic field hydraulic machine |
| CN107866570A (en) * | 2017-12-15 | 2018-04-03 | 东北大学 | A kind of equipment for powder metallurgy warm pressing formation |
| CN113276466B (en) * | 2021-05-10 | 2022-06-21 | 盐城凯龙药业有限公司 | Cimetidine tablet tabletting process and tabletting equipment thereof |
| CN116944497B (en) * | 2023-09-18 | 2023-12-08 | 泰州市华诚钨钼制品有限公司 | Tungsten molybdenum alloy piece shaping pressing equipment |
| CN117655324A (en) * | 2024-01-29 | 2024-03-08 | 虞锋超硬材料科技(苏州)有限公司 | Powder metallurgy side hole forming die convenient for demoulding |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4518335A (en) * | 1984-03-14 | 1985-05-21 | Allied Corporation | Dilatant mold and dilatant molding apparatus |
| JPS61273298A (en) * | 1985-05-28 | 1986-12-03 | Nippon Kokan Kk <Nkk> | Molding method for powder |
| JPS62297402A (en) * | 1986-06-17 | 1987-12-24 | Nippon Kokan Kk <Nkk> | Molding method for powder |
| CN2393708Y (en) * | 1999-09-28 | 2000-08-30 | 万融机械工业有限公司 | Vacuum forming apparatus with fastening press mechanism |
| CN2607246Y (en) * | 2002-08-22 | 2004-03-24 | 大连大锻机床设备厂 | Heat pressing shaping vacuumizing hydraulic press |
| US9248503B2 (en) * | 2007-04-04 | 2016-02-02 | Gkn Sinter Metals, Llc | Powder metal forging and method and apparatus of manufacture |
| CN201064955Y (en) * | 2007-06-12 | 2008-05-28 | 南通富仕液压机床有限公司 | Upper fixed board structure for dry powder automatic forming hydraulic press die carrier |
| CN202571227U (en) * | 2012-05-21 | 2012-12-05 | 武汉钢铁(集团)公司 | Adjustable supporting and pulling rod |
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2012
- 2012-02-28 CN CN 201210046897 patent/CN102554226B/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN102554226A (en) | 2012-07-11 |
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