CN100441393C - Tubular injection moulding piece production technology- rubber tube core extraction method - Google Patents
Tubular injection moulding piece production technology- rubber tube core extraction method Download PDFInfo
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- CN100441393C CN100441393C CNB200510030608XA CN200510030608A CN100441393C CN 100441393 C CN100441393 C CN 100441393C CN B200510030608X A CNB200510030608X A CN B200510030608XA CN 200510030608 A CN200510030608 A CN 200510030608A CN 100441393 C CN100441393 C CN 100441393C
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- rubber tube
- core
- tube core
- negative pressure
- injection moulding
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Abstract
The invention relates to a rubber tube corn drawing method. Wherein, it uses rubber material to prepare hollow tubular corn; fills dry sand into rubber tube, and compresses with passive pressure; then puts the rubber tube on the injection mould, closes mould and injects; when the injection tube with corn is removed, releases passive pressure, to draw out the corn completely.
Description
Technical field
Injection moulding industry tubular injection moulding piece.For example: inlet manifold.
Technical background
Usually the tube chamber of moulding part all is to be formed in the reciprocating motion of opening and closing mould by the tube chamber plug (metal bar) on the injection mold.So the tube chamber that forms can only be straight chamber.Crooked pipe or pipe part (as inlet manifold) thick, the combination of tubule chamber just can not have been realized with the mode of production of above-mentioned injection mold.For, patented technology was once arranged: adopt " fusible core method " production inlet manifold moulding.This method is because essential elements such as the metallic element bismuth in the low-melting alloy, lead, cadmium are poisonous and harmful, the chemical substance of forbidding.So the pressure of environmental pollution aspect is big, the technological process complexity, the production cost height is difficult for a large amount of production.So, external " welding " production inlet manifold that extensively adopts at present.Be about to the inlet manifold dimidiation, respectively injection molded; And then the two halves pipe fitting is welded.Adopt " welding " must buy external technology and special welding equipment and special-purpose solderability engineering plastic particle.Abroad (France) manufacturer also promotes these equipment and technology at home, and it is all very high to ask a price.Up-front investment is no less than 5,000,000 yuan.It is too big to buy external welding risk: 1. so-called " solder technology " is difficult to grasp, and the production process instability causes product quality very unstable, the production cost height.2. domestic automobile works (joint) is all big with welding inlet manifold technical difficulty, disagrees with production domesticization, and is therefore supporting very difficult.Under this background, Yuyao, Ningbo factory investment " welding " inlet manifold that spends huge sums.Because of unstable product quality, supporting difficulty yields poorly eventually, and production cost is high.Slowly receive not backing up money, project is failed.Above various reasons cause domestic bending, complicated tubular injection moulding piece can't be in a large number, high-quality, High-efficient Production.
Summary of the invention
It should be direction---constant product quality that integral molded plastic is produced pipe part, reliability height, production efficiency height.But integral molded plastic must at first solve " getting core " this difficult problem.This patent has been invented " rubber tube core extraction method " integral molded plastic and has been produced pipe part, has realized that integral body looses core, and has solved this difficult problem.Particular content is as follows:
Make hollow tubular core with elastomeric material---get its flexibility, elasticity, be convenient to from bending, complicated tube chamber, take out; Lay arbor in the rubber tube, insert dry sand and negative pressure consolidation---get its rigidity, be convenient to injection molded.The rubber tube core that will be under the negative pressure consolidation state is placed in the injection mold, and mold-closing injection is shaped.Die sinking is taken out the injection moulding pipe fitting fuse of ining succession in the lump.After the taking-up, remove negative pressure immediately, pour out dry sand.Catch the rubber tube of core print part to twitch gently with hand, just whole rubber tube core all can be extracted out in the injection moulding pipe fitting.So far, the production of an injection moulding pipe fitting finishes.The rubber tube core horse back of extracting out is the back-up sand consolidation again, is used for the production of following moulding.When loosing core, for the resistance that reduces to loose core also can be after pouring out dry sand, the rubber tube core vacuumized once more set up negative pressure, at this moment, the rubber tube wall hightails the moulding luminal surface, and is attached together mutually, and it is just easier to loose core like this.
The inventor adopts " rubber tube core extraction method ", on 250 gram injection machines, adopts the PA-66 engineering plastics successfully to produce 10 injection moulding pipe fittings continuously.This invention has realized finally.
Through production practices, to rubber tube core extraction method, the characteristics of this new technology are summarized as follows:
1. injection moulding pipe fitting luminal surface is smooth, and is beautiful.
2. integral molded plastic is produced pipe part, process stabilization, and repeatability is high, constant product quality.
3. used rubber tube core is reusable, and production cost is low.
4. injection moulding and coremaking can be at the other synchronous operation of an injection machine, production efficiency height.(core, mold-closing injection under the people; One people's pickup, loose core; One people's coremaking)
5. small investment, equipment is simple, is convenient to promote.(equipment is homemade) only increases a vavuum pump except that injection machine and injection mold, a bumper can be produced in batches once secondary rubber tube mould.
6. Guan Jian advantage is, is expected to make a large amount of, the high-quality of inlet manifold working of plastics, High-efficient Production to become possibility, thereby abandoned the dependence to " welding " technology.The inlet manifold that integral molded plastic is produced, than the product reliability of welding higher, more can be accepted by automobile works and vast engine works.
7., should be the rubber tube core and join a secondary conformal mold if during production inlet manifold.Fuse is put into mold, last bumper ram-jolt dry sand and negative pressure consolidation.Again fuse is taken out from mold behind the consolidation,, play the effect of stabilized product quality to guarantee the size and dimension of fuse.
8. the pipe that adopts this method to produce, its lumen diameter is littler than the rubber tube core external diameter under the free state.As for how much little? this just relates to the hardness of used elastomeric material, sebific duct wall thickness, the pressure four aspect factors the when vacuum of negative pressure consolidation and injection mo(u)lding.And these factors are along with different manufacturers, and different product will constantly change.So, when adopting this method to produce product, to do the straight tube little sample testing earlier, determine amount of contraction.Under the normal condition, amount of contraction is stable.Should serve as according to the external diameter that designs rubber tube core under the free state, to satisfy the requirement of product lumen size to test definite amount of contraction.This invents practice, and the amount of contraction of mensuration is about 1 millimeter.
Description of drawings:
Rubber tube core extraction method production system schematic diagram, description of symbols:
1 vavuum pump, 2 injection molds, 3 vacuum tubes
4 push-in pipe joint 5 negative pressure connected bodies 6 woven wires
7 plugs, 8 clips, 9 arbors
10 dry sands, 11 plastic sheetings, 12 protection cover caps
13 rubber tube cores, 14 injection moulding pipe fittings
The specific embodiment
1. the design of rubber tube core
The outer shape of rubber tube, size should meet shape, the size of injection moulding pipe fitting tube chamber.This invents realization, and design rubber tube wall thickness is 2mm.The same with the principle of metal casting " following core ", the rubber tube core also should leave core print.But in this patent technology, core print not only plays support, the fixedly effect of fuse, and plays back-up sand, vacuumizes the key effect of shaking out.(as schematic diagram) end core print part has designed arm, is used for connecting with vacuum system.As shown in the figure, arm connects by clip with " negative pressure connected body ".And other end core print does not have arm, and its feature is a top end opening, is used for back-up sand, shakes out.
The sebific duct end all is designed to " opening ", has designed " plug " for the rubber tube terminal opening again.The employing steel are made.Because the function difference of two ends core print is so " plug " at two ends design is also different, as schematic diagram.After rubber tube was made, the both ends open place in time inserted " plug ", and tighten with clip the rubber tube outside, definitely can not leak gas.
2. select the rubber tube material
Heating-up temperature during the injection moulding of PA-66 engineering plastics is generally at 240～260 ℃, domestic high temperature resistant 250～280 ℃ silicon rubber at present, and technology is very ripe, and is widely used.So adopting the high-temperature-resisting silicon rubber material is adequate fully as the coremaking material, also be fully feasible.The silicon rubber material of having selected for use a kind of high temperature resistant 250 ℃ specialized factory to produce in the implementation procedure of the present invention, hardness 51 degree.On common vulcanizer, make rubber tube.
3. insert dry sand, ram-jolt and negative pressure consolidation
The principle of metal casting " vacuum moulding " has been used for reference in this activity.Dry sand ram-jolt here is the key point of guaranteeing rubber die-size, shape.Insert dry sand from the opening part of back-up sand end " plug ".This time used dry sand is the 40-70 order.Put into the bone core in the back-up sand process, arbor adopts alloy steel rod ∮ 10.After dry sand ram-jolt is filled up, spread plastic sheeting, i.e. vacuum-pumping negative pressure consolidation on the dry sand surface.The negative-pressure vacuum degree reaches 0.04～0.06Mpa and gets final product injection moulding.After negative pressure is set up, just should add a cover " protection cover cap " on plastic sheeting, protective cover is built the effect of protection plastic sheeting.
4. vacuum system
Critical piece is " a negative pressure connected body ".There is a through hole in its heart portion, plays the effect of ventilation.The through hole two ends are respectively goal-net concave station and one section screw thread.The goal-net concave station communicates with the rubber tube chamber.The goal-net concave station is used for depositing woven wire, and (as schematic diagram) is drawn into vavuum pump to avoid sand grains.The other end of through hole and push-in pipe joint thread connection.Vacuum tube directly inserts pipe joint.Vacuum tube is terminal to link with the vavuum pump bleeding point.This invention realizes that the pipe fitting of producing is smaller, so adopted 2XZ series twin-stage direct connection vavuum pump.2～3 minutes pumpdown times.This time invention is not a large amount of productions, so adopt vavuum pump to shut down, the vacuum tube of extracting on the pipe joint is removed negative pressure, so that loose core.During a large amount of production, a vavuum pump can only not served a fuse simultaneously, need set up the vacuum pipe network system, should dispose the open and close of vacuum valve control vacuum system, rather than adopt and shut down.
5. play core, mold-closing injection, get core
It is enough that injection mold is that the core print structure division of rubber tube core has been reserved, accurately the position.The rubber tube core (fuse is a vacuum tube in tow) that will be under the negative pressure consolidation state is placed in the mould, gets final product mold-closing injection.Invention this time realizes PA-66 engineering plastics heating-up temperature is set at 260 ℃, and other parameters are compared with general moulding, do not have the place of special difference.The injection moulding pipe fitting is taken out in die sinking.Close vavuum pump after the pickup at once, extract vacuum tube, negative pressure has just been removed.The protection cover cap of taking away is thrown off plastic sheeting, unclamps the clip nut and withdraws from clip, extracts " plug ", promptly pourable dry sand and arbor.Catch arm one end core print rubber tube with hand, twitch gently, the rubber tube core has just been released from moulding.So far, the production of an injection moulding pipe fitting finishes.Also tested dry sand to the greatest extent after, do not loose core earlier, the rubber tube core is vacuumized again sets up negative pressure.The rubber tube wall all is attached together, and it is easier to loose core.
The reference parameter table
Claims (2)
1. an integral molded plastic is produced the method for tubular injection moulding piece, and its technical characterictic is:
Adopt elastomeric material to make hollow tubular core, fill up dry sand in tubular core, lay arbor simultaneously, the rubber tube core that will be in negative pressure consolidation state is placed in the injection mold, is used for the injection mo(u)lding of pipe fitting; Injection moulding finishes, and takes out the back at pipe fitting and removes negative pressure, and whole rubber tube core is taken out from the plastics tube chamber.
2. production method according to claim 1, its technical characterictic are that the described core pulling method that fuse is taken out is:
After the pipe fitting demoulding, the rubber tube core is removed negative pressure, use up dry sand; Then, hollow rubber tube core is set up negative pressure, this moment, the rubber tube wall all was attached together, and just whole rubber tube core can be extracted out from the plastics tube chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510030608XA CN100441393C (en) | 2005-10-17 | 2005-10-17 | Tubular injection moulding piece production technology- rubber tube core extraction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510030608XA CN100441393C (en) | 2005-10-17 | 2005-10-17 | Tubular injection moulding piece production technology- rubber tube core extraction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1951665A CN1951665A (en) | 2007-04-25 |
| CN100441393C true CN100441393C (en) | 2008-12-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200510030608XA Expired - Fee Related CN100441393C (en) | 2005-10-17 | 2005-10-17 | Tubular injection moulding piece production technology- rubber tube core extraction method |
Country Status (1)
| Country | Link |
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| CN (1) | CN100441393C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008110031A1 (en) * | 2007-03-12 | 2008-09-18 | Lichang Wu | A method for manufacturing a tubular injection molded part |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05278128A (en) * | 1992-03-31 | 1993-10-26 | Daiwa Seiko Inc | Deformed tubular body |
| JPH1063771A (en) * | 1996-08-23 | 1998-03-06 | Matsushita Electric Ind Co Ltd | Two-dimensional code reader |
-
2005
- 2005-10-17 CN CNB200510030608XA patent/CN100441393C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05278128A (en) * | 1992-03-31 | 1993-10-26 | Daiwa Seiko Inc | Deformed tubular body |
| JPH1063771A (en) * | 1996-08-23 | 1998-03-06 | Matsushita Electric Ind Co Ltd | Two-dimensional code reader |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1951665A (en) | 2007-04-25 |
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Granted publication date: 20081210 Termination date: 20131017 |