CA2332798A1 - Injection moulding tool and method for the production thereof - Google Patents
Injection moulding tool and method for the production thereof Download PDFInfo
- Publication number
- CA2332798A1 CA2332798A1 CA002332798A CA2332798A CA2332798A1 CA 2332798 A1 CA2332798 A1 CA 2332798A1 CA 002332798 A CA002332798 A CA 002332798A CA 2332798 A CA2332798 A CA 2332798A CA 2332798 A1 CA2332798 A1 CA 2332798A1
- Authority
- CA
- Canada
- Prior art keywords
- production
- injection
- mould
- model
- moulded part
- 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.)
- Abandoned
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000001746 injection moulding Methods 0.000 title description 10
- 238000002347 injection Methods 0.000 claims abstract description 17
- 239000007924 injection Substances 0.000 claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 6
- 238000000465 moulding Methods 0.000 claims abstract description 4
- 238000005266 casting Methods 0.000 claims description 6
- 238000005245 sintering Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/007—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of moulds
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
The inventive method for the production of a metal mould in order to manufacture a limited amount of mass-produced injection moulded parts (2) consists in producing a moulded part (7) by means of injected powder moulding based on a model for said injection moulded part (2) and in producing a tool therefrom by means of debinding and sintering.
Description
English Translation of PCT-Publication WO 99/5970 Injection moulding tool and method for the production thereof T'he invention relates to a method for the production of a metal injection moulding tool for the limited mass production of injection moulded parts with dimensions S typically greater than 1 mm. For the purpose of this description, the expression "limited mass production" is used for the manufacture of injection moulded parts in runs preferably in the order of 1000 to 100,000. For comparison, conventional injection moulding tools allow runs of about ten times the size, whereas the so-called rapid tooling or rapid prototyping method is suitable for runs of about one tenth the size.
Conventional injection moulding tools for the mass production of injection moulded parts are very laborious to produce and hence very expensive. This applies especially to finishing in cases where modifications are subsequently required, so they are only economic for the true mass production of millions of pieces.
Temporary tools made of diverse materials are therefore often used for the production of small numbers of prototypes or the production of pilot runs and small runs. Thus, for example, casting resin tools or even wooden moulds have already been in conventional use for a relatively long time in the casting mould or thermoforming technique.
Because of the high pressures in the tool, the injection moulding process has always meant that said temporary materials can only be used for a short time.
More recently, there has been a growing interest in tools which can be produced rapidly and inexpensively. The object of the invention is therefore to produce an injection moulding tool which on the one hand can be produced rapidly and inexpensively and on the other hand allows larger production runs than do tools made of "soft materials".
This is achieved according to the invention by a method of the type mentioned at the outset which is characterized in that a model of the injection moulded part to be manufactured is placed in a standard casting mould, powder is injected into the mould with the model in position, and the moulded part formed is debound and then sintered.
An Example of the invention is described below with the aid of the attached drawings, in which:
Fig. 1 is a schematic representation of the steps of the method for the production of an injection moulding tool for the manufacture of a plastic cog, and Fig. 2 is a detail of the production method.
A model 1 of the injection moulded part 2 to be manufactured - a plastic cog in the present case - can be produced in various ways. The extra amounts necessary to compensate for the shrinkage on sintering are known from injected powder moulding technology. In the present Example, a mould of the model is produced on the basis of CAD worksheets 3 by means of the known stereolithography 4 and the synthetic resin model 1 is cast in said mould in a casting process 5, also known per se.
In the next step, this model is placed or mounted in a standard casting mould 6.
The mould is then closed and powder is injected into it. The resulting moulded part 7 constitutes a so-called green body and in this state is very easy to work.
The next step is the debinding of the moulded part, which can be carried out in various ways, e.g. by thermal decomposition, solvent extraction, catalytic debinding, etc. The final step is sintering, i.e. pressureless compaction of the moulded part, to reach approximately the theoretical density of the metallic material. The result is a metal injection moulding tool 8 which allows the manufacture of injection moulded parts in runs in the order of 100,000.
The advantages of this method are firstly the relatively short time required from the design drawing to the finished tool, a typical duration being no more than two weeks. Secondly, the method is extremely inexpensive. A tool produced by this method is about 20 to 30% of the cost of a conventional production tool.
Finally, a further advantage is the possibility, illustrated in Fig. 2, of producing several identical moulded parts 9, 10, 11 and keeping them in the green body state.
Because they can easily be finished in this state, they can be modified very rapidly as required. Thus the tool retouching operations, modifications or repairs feared in conventional injection moulding technology no longer present a problem.
The material used for the tool is preferably steel, but it is also conceivable to use other materials, e.g. ceramic, which can be processed by injected powder moulding.
Conventional injection moulding tools for the mass production of injection moulded parts are very laborious to produce and hence very expensive. This applies especially to finishing in cases where modifications are subsequently required, so they are only economic for the true mass production of millions of pieces.
Temporary tools made of diverse materials are therefore often used for the production of small numbers of prototypes or the production of pilot runs and small runs. Thus, for example, casting resin tools or even wooden moulds have already been in conventional use for a relatively long time in the casting mould or thermoforming technique.
Because of the high pressures in the tool, the injection moulding process has always meant that said temporary materials can only be used for a short time.
More recently, there has been a growing interest in tools which can be produced rapidly and inexpensively. The object of the invention is therefore to produce an injection moulding tool which on the one hand can be produced rapidly and inexpensively and on the other hand allows larger production runs than do tools made of "soft materials".
This is achieved according to the invention by a method of the type mentioned at the outset which is characterized in that a model of the injection moulded part to be manufactured is placed in a standard casting mould, powder is injected into the mould with the model in position, and the moulded part formed is debound and then sintered.
An Example of the invention is described below with the aid of the attached drawings, in which:
Fig. 1 is a schematic representation of the steps of the method for the production of an injection moulding tool for the manufacture of a plastic cog, and Fig. 2 is a detail of the production method.
A model 1 of the injection moulded part 2 to be manufactured - a plastic cog in the present case - can be produced in various ways. The extra amounts necessary to compensate for the shrinkage on sintering are known from injected powder moulding technology. In the present Example, a mould of the model is produced on the basis of CAD worksheets 3 by means of the known stereolithography 4 and the synthetic resin model 1 is cast in said mould in a casting process 5, also known per se.
In the next step, this model is placed or mounted in a standard casting mould 6.
The mould is then closed and powder is injected into it. The resulting moulded part 7 constitutes a so-called green body and in this state is very easy to work.
The next step is the debinding of the moulded part, which can be carried out in various ways, e.g. by thermal decomposition, solvent extraction, catalytic debinding, etc. The final step is sintering, i.e. pressureless compaction of the moulded part, to reach approximately the theoretical density of the metallic material. The result is a metal injection moulding tool 8 which allows the manufacture of injection moulded parts in runs in the order of 100,000.
The advantages of this method are firstly the relatively short time required from the design drawing to the finished tool, a typical duration being no more than two weeks. Secondly, the method is extremely inexpensive. A tool produced by this method is about 20 to 30% of the cost of a conventional production tool.
Finally, a further advantage is the possibility, illustrated in Fig. 2, of producing several identical moulded parts 9, 10, 11 and keeping them in the green body state.
Because they can easily be finished in this state, they can be modified very rapidly as required. Thus the tool retouching operations, modifications or repairs feared in conventional injection moulding technology no longer present a problem.
The material used for the tool is preferably steel, but it is also conceivable to use other materials, e.g. ceramic, which can be processed by injected powder moulding.
Claims (5)
1. Method for the production of a metal injection mould for the limited mass production of injection moulded parts with dimensions typically greater than 1 mm, characterized in that:
(a) a model of the injection moulded part to be manufactured is placed in a standard casting mould, (b) powder is injected into the mould with the model in position, (c) the moulded part formed is debound and (d) the debound moulded part is sintered.
(a) a model of the injection moulded part to be manufactured is placed in a standard casting mould, (b) powder is injected into the mould with the model in position, (c) the moulded part formed is debound and (d) the debound moulded part is sintered.
2. Method for the production of an injection mould according to Claim 1, characterized in that the moulded part is finished prior to debinding.
3. Method for the production of an injection mould according to Claim 1, characterized in that the model is produced by the so-called rapid prototyping method, e.g. by means of stereolithography.
4. Metal injection mould for the limited mass production of injection moulded parts, characterized in that it is produced by a method according to one of Claims 1-3.
5. Application of the injected powder moulding method to the production of a metal injection mould for the limited mass production of injection moulded parts.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH1103/98 | 1998-05-19 | ||
| CH110398 | 1998-05-19 | ||
| PCT/CH1999/000211 WO1999059790A1 (en) | 1998-05-19 | 1999-05-18 | Injection moulding tool and method for the production thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2332798A1 true CA2332798A1 (en) | 1999-11-25 |
Family
ID=4202549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002332798A Abandoned CA2332798A1 (en) | 1998-05-19 | 1999-05-18 | Injection moulding tool and method for the production thereof |
Country Status (10)
| Country | Link |
|---|---|
| EP (1) | EP1082200A1 (en) |
| JP (1) | JP2002515359A (en) |
| CN (1) | CN1301211A (en) |
| AU (1) | AU3593299A (en) |
| BR (1) | BR9910562A (en) |
| CA (1) | CA2332798A1 (en) |
| HU (1) | HUP0102028A2 (en) |
| MX (1) | MXPA00011177A (en) |
| SK (1) | SK17252000A3 (en) |
| WO (1) | WO1999059790A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3027840B1 (en) * | 2014-11-04 | 2016-12-23 | Microturbo | PROCESS FOR MANUFACTURING A CERAMIC TURBINE BLADE |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1266159A (en) * | 1983-04-09 | 1990-02-27 | Takeo Nakagawa | Composite and durable forming model with permeability |
| FR2624770B1 (en) * | 1987-12-16 | 1990-12-28 | Ebauchesfabrik Eta Ag | PROCESS FOR PRODUCING A MOLD FOR THE MANUFACTURE OF PARTS OF VERY SMALL DIMENSIONS |
| JPH03267302A (en) * | 1990-03-16 | 1991-11-28 | Olympus Optical Co Ltd | Method for forming compacting powder |
| JPH05104589A (en) * | 1991-10-15 | 1993-04-27 | Takamatsu Kikai Kogyo Kk | Forming method of fitment of injection molding die |
| DE4332971A1 (en) * | 1993-09-28 | 1995-03-30 | Fischer Artur Werke Gmbh | Process for the production of interlocking parts |
| JP3240023B2 (en) * | 1993-10-08 | 2001-12-17 | 新東工業株式会社 | Manufacturing method of durable air-permeable type |
| JPH08150437A (en) * | 1994-11-25 | 1996-06-11 | Ube Ind Ltd | Production of die with permeability having heating, cooling hole and die with permeability |
| DK134295A (en) * | 1995-11-28 | 1997-05-29 | Formkon Aps | Process for making two or multi-part molds |
-
1999
- 1999-05-18 WO PCT/CH1999/000211 patent/WO1999059790A1/en not_active Application Discontinuation
- 1999-05-18 CN CN99806058A patent/CN1301211A/en active Pending
- 1999-05-18 MX MXPA00011177A patent/MXPA00011177A/en not_active Application Discontinuation
- 1999-05-18 HU HU0102028A patent/HUP0102028A2/en unknown
- 1999-05-18 CA CA002332798A patent/CA2332798A1/en not_active Abandoned
- 1999-05-18 JP JP2000549439A patent/JP2002515359A/en active Pending
- 1999-05-18 EP EP99917736A patent/EP1082200A1/en not_active Ceased
- 1999-05-18 SK SK1725-2000A patent/SK17252000A3/en unknown
- 1999-05-18 AU AU35932/99A patent/AU3593299A/en not_active Abandoned
- 1999-05-18 BR BR9910562-4A patent/BR9910562A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| MXPA00011177A (en) | 2003-04-22 |
| SK17252000A3 (en) | 2001-04-09 |
| EP1082200A1 (en) | 2001-03-14 |
| JP2002515359A (en) | 2002-05-28 |
| BR9910562A (en) | 2001-09-11 |
| CN1301211A (en) | 2001-06-27 |
| AU3593299A (en) | 1999-12-06 |
| HUP0102028A2 (en) | 2001-10-28 |
| WO1999059790A1 (en) | 1999-11-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |