CN101254651A - Production method of compression moulding forming polyolefin pipe fitting and equipment - Google Patents
Production method of compression moulding forming polyolefin pipe fitting and equipment Download PDFInfo
- Publication number
- CN101254651A CN101254651A CNA2007100137409A CN200710013740A CN101254651A CN 101254651 A CN101254651 A CN 101254651A CN A2007100137409 A CNA2007100137409 A CN A2007100137409A CN 200710013740 A CN200710013740 A CN 200710013740A CN 101254651 A CN101254651 A CN 101254651A
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- CN
- China
- Prior art keywords
- blank
- formation
- tubes
- pipe fitting
- mould
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92514—Pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92895—Barrel or housing
Abstract
The invention relates to a method for manufacturing polyolefin pipes by compression molding, which comprises the following continuous production steps: (1) plasticizing a polyolefin material in an extruder; (2) feeding the plasticized material into a blank mold and molding to obtain a blank at a temperature of 80 to 210 DEG C and under a pressure of 0.3 to 0.8 MPa; (3) pressing the blank in a molding mold with a water-cooling device and an air discharge outlet under a pressure of 8 to 30 MPa, wherein the inlet water has a temperature of 18 to 25 DEG C; (4) keeping the temperature of the pipe at 10 to 25 DEG C for at least 24 h; and (5) mechanically processing to obtain a qualified product. The invention simultaneously provides production equipment for achieving the process. The product manufactured by the method has the advantages of no pores, shrinkage holes and cracks, smooth inner and outer walls and high density to meet the international standard, and the manufacture method has the advantages of simple operation, high yield and less equipment investment.
Description
Technical field
The invention belongs to the manufacturing technology of polyolefin pipe fitting.
Background technology
The mode of polyolefin (as polyethylene) formation of tubes is nothing more than following two kinds of molding modes are arranged on the present domestic market: injection molding and compression molding mode.A kind of defective that can't overcome that this dual mode all exists, there is pore in goods inside, and the pipe fitting packing is not high, causes intensity to reduce and can't satisfy normal instructions for use.And these two kinds of molding modes all exist defective separately.Injection molding, the equipment and mold input cost is big, the requirement that is subjected to moulding process is the heavy caliber pipe fitting particularly, production efficiency is low, and the air that material interflow in material and the moulding is surrounded can't be discharged in the forming process, promptly can't realize repeatedly exhaust, the result who causes is exactly that the pipe fitting goods exist pore inevitably, pipe fitting intensity is reduced can't reach instructions for use.As for its moulding process of general compression molding technology all is directly to put into (artificial or automatically) pressure mould, the moulding of exerting pressure after with the method extruded the polyethylene material being plastified by extruder.This forming method can't solve the release problem that wraps in the material gas inside in the material forming flow process equally, causes the inner leachy phenomenon of goods equally, causes product strength to reduce and can't satisfy instructions for use.
Summary of the invention
Technical problem to be solved by this invention provides the inner pore-free of a kind of polyolefin pipe fitting goods in manufacture process, shrinkage cavity and goods packing height, the manufacture method of the compression moulding forming polyolefin pipe fitting of defectives such as flawless and equipment.
The manufacture method of compression moulding forming polyolefin pipe fitting of the present invention is characterized in that comprising following continuous production stage:
(1), the polyolefin raw material plastifies in extruder;
(2) raw material after the plasticizing enters and is shaped to blank in the blank mold, and wherein controlling forming temperature is 80～210 ℃, pressure 0.3～0.8MPa;
(3) blank enters in the formation of tubes mould and suppresses, and pressing pressure is 8～30MPa, and mould has water cooling plant outward, and going into coolant-temperature gage is 18～25 ℃, has air exit in the mould;
(4) carry out constant temperature behind the formation of tubes and handle, temperature is 10～25 ℃, at least 24 hours time;
(5) mechanical process obtains qualified product.
Above-mentioned steps (3) can be carried out three compactings, and general preceding twice press time is 2-3 minute, and the last press time can decide according to size, the shape of pipe fitting.Be generally 15-20 minute as the φ 500mm flanged fitting press time
The general apparent diameter size of raw material after step (2) plasticizing is determined briquetting pressure.
Realize the compression molding device of manufacture method of the present invention: comprise the single screw extrusion machine of being with drying hopper, the blank make-up machine, the blank conveying device, hydraulic press, the formation of tubes mould, described blank make-up machine comprises platform, be placed on the blank mold on the platform, one-level cylinder that is connected with blank mold and the secondary cylinder that is connected with the one-level cylinder, one-level cylinder and secondary cylinder are rack-mount by adapter sleeve respectively, described blank conveying device is connected between single screw extrusion machine and the blank mold, form by propulsion cylinder and shovel board, described formation of tubes mould is placed on the hydraulic press, and the single screw extrusion machine outlet is connected with the blank mold chamber of blank make-up machine by tube connector.
Polyolefin is behind combination drying machine combination drying, join in the loading hopper of single screw extrusion machine, at a certain temperature, extruder is with raw material plasticizing back (being the known technology method), enter in the blank mold of blank make-up machine through tube connector, the packing of the material that the plasticizing in the blank mold is good is to regulate by the pressure of one-level cylinder to realize, exert pressure by the one-level cylinder, make the gasless blank in inside of rule, along with being increased to, extruding of material set (size according to pipe fitting is decided) when requiring, secondary cylinder begins action, blank mold is mentioned, and blank is deviate from from blank mold automatically, and the shovel board of blank conveying device is under the effect of propulsion cylinder at this moment, the blank material is sent into the formation of tubes mould that is positioned on the hydraulic press flat board, be pressed.
Described formation of tubes mould comprises die body, core, pressure head, die body has water jacket outward, die body and core form the formation of tubes chamber, be provided with the pusher ring in the end of formation of tubes chamber, the pusher ring connects push rod, pusher ring and push rod are installed on the connector, the push rod end is assembled in pressing plate and moves back on the plate, connector and moving back between the plate links together by pillar, fixed head, be provided with in the middle of the fixed head and move back plate hole, between pusher ring and the forming cavity and the gap (matched in clearance) that is provided with 0.15～0.2mm between push rod and the connector.
The pressure head of formation of tubes mould is connected with hydraulic press, and blank is put into the die body top, opens the compacting of hydraulic press matched moulds, blank is extruded in the formation of tubes chamber, simultaneously by the gap exhaust between pusher ring and forming cavity, push rod and the connector, the pipe fitting pore-free that makes compacting, solidity ratio is higher.Compacting finishes, and lifts pressure head, adopts oil cylinder or miscellaneous equipment upwards to move back plate in the top by the plate hole that moves back in the middle of the fixed head, makes the pusher ring that the pipe fitting in the forming cavity is ejected.
Entering thermostatic chamber constant temperature at the pipe fitting of formation of tubes die for molding handles and gets final product.After again by dimensional requirement after lathe turning processing, obtain qualified goods.
Advantage of the present invention is:
1, goods pore-free, shrinkage cavity, crackle, inside and outside wall are smooth.
2, goods packing height reaches the requirement of GB pressure test.
3, easy and simple to handle, yield rate height, equipment less investment.
Description of drawings
Fig. 1 is a process equipment flow chart of the present invention;
Fig. 2 is a formation of tubes mould structure schematic diagram;
Among the figure: 1 single screw extrusion machine, 2 drying hoppers, 3 propulsion cylinders, 4 shovel boards, 5 one-level cylinders, 6 secondary cylinders, 7 blank mold, 8 supports, 9 adapter sleeves, 10 platforms, 11 tube connectors, 12 four-column hydraulic presses, 13 formation of tubes moulds, 14 fixed heads 15 move back plate 16 pressing plates 17 push rods 18 pillars 19 alignment pins 20 connectors 21 pusher rings 22 die bodys 23 forming cavities 24 water jackets 25 pressure heads 26 leads 27 cores 28 joint pins 29 and move back plate hole
The specific embodiment
Below in conjunction with embodiment description of drawings process of the present invention and equipment.
As Fig. 1, equipment comprises: single screw extrusion machine 1, blank make-up machine, blank conveying device, four-column hydraulic press 12, the formation of tubes mould 13 of band drying hopper 2.Described blank make-up machine comprises platform 10, is placed on blank mold 7, one-level cylinder 5 that is connected with blank mold 7 and the secondary cylinder 6 that is connected with the one-level cylinder on the platform, one-level cylinder 5 and secondary cylinder 6 are installed on the support 8 by adapter sleeve 9 respectively, and blank mold 7 can slide up and down on support 8 under the drive of secondary cylinder 6 together with one-level cylinder 5.Described blank conveying device is connected between single screw extrusion machine 1 and the blank mold 7, is made up of propulsion cylinder 3 and shovel board 4.Described formation of tubes mould 13 is placed on the four-column hydraulic press 12, and single screw extrusion machine 1 outlet is connected with blank mold 7 chambeies of blank make-up machine by tube connector 11.
As Fig. 2, formation of tubes mould 13 comprises die body 22, core 27, pressure head 25, the die body 22 outer water jackets 24 that have, die body 22 forms formation of tubes chamber 23 with core 27, be provided with pusher ring 21 in 23 ends of formation of tubes chamber, pusher ring 21 connects push rod 17, pusher ring 21 is installed on the connector 20 with push rod 17, push rod 17 ends move back plate 15 by pressing plate 16 connections, connector 20 and moving back between the plate 15 by pillar 18, fixed head 14 links together, be provided with in the middle of the fixed head 14 and move back plate hole 29, between pusher ring 21 and the forming cavity 23 and gap that is provided with 0.15～0.2mm between push rod 17 and the connector 20.
Plastic raw materials (polyolefin) is behind combination drying machine combination drying, join in the loading hopper 2 of single screw extrusion machine 1, at a certain temperature, after extruder plastifies raw material, enter in the blank mold 7 of blank make-up machine through tube connector 11, make the gasless blank in inside of rule, in this process, will control indexs such as temperature, pressure.With the polyethylene is example, and temperature should be between 80-210 ℃, and the pressure of blank make-up machine generally should be controlled at (look the pipe fitting diameter, the pipe fitting diameter is big more, the corresponding increase of pressure) between the 0.3-0.8MPa.Pressure in the blank mold 7 is regulated by one-level cylinder 5, along with being increased to, extruding of material set (size according to pipe fitting is decided) when requiring, secondary cylinder 6 begins action, and blank mold 7 is mentioned together with one-level cylinder 5, and the blank of formation is deviate from from blank mold 7 automatically.Shovel board 4 is sent blank into the formation of tubes mould 13 that is positioned on hydraulic press 9 flat boards under the effect of propulsion cylinder 3 at this moment, is pressed.The pressure head of formation of tubes mould 13 is connected with four-column hydraulic press 12, blank is put into die body 22 tops, open the compacting of four-column hydraulic press 12 matched moulds, blank is extruded in the formation of tubes chamber 23, simultaneously by the gap exhaust between pusher ring 21 and forming cavity 23, push rod 17 and the connector 20, the pipe fitting pore-free that makes compacting, solidity ratio is higher.Will divide three compactings in pressing process, general preceding twice press time is 2-3 minute, and the last press time can decide according to size, the shape of pipe fitting.Be generally 15-20 minute as the φ 500mm flanged fitting press time, between shaping period, also will control the pressure of hydraulic press, be generally 8-30MPa, decide on the pipe fitting size.The temperature of mould also will be controlled, and logical cooling water is gone into coolant-temperature gage and is generally 18-25 ℃ in the water jacket 24 outside die body.Compacting finishes, and lifts pressure head 25, adopts oil cylinder or miscellaneous equipment upwards to move back plate 15 in the top by the plate hole 29 that moves back in the middle of the fixed head, makes pusher ring 21 that the pipe fitting in the forming cavity is ejected.Take out behind the formation of tubes, put into thermostatic chamber 24 hours, the thermostatic chamber temperature is generally 10-25 ℃ and is advisable.After again by dimensional requirement after lathe turning processing, obtain qualified goods.
Technology, technical parameter are as follows:
The temperature of combination drying machine: 70 ℃-110 ℃
Extruder and blank make-up machine blank mold temperature: 80 ℃-210 ℃
Blank make-up machine one-level cylinder operation pressure: 0.3-0.8MPa, secondary cylinder operating pressure 0.3-0.8MPa
Propulsion cylinder operating pressure 0.3-0.8MPa
Hydraulic press operating pressure: 8-30MPa
Formation of tubes mold temperature: 18-25 ℃
With Φ 500 flanged fittings is example, and the effect that the present invention reaches is as follows:
Flattening test: pipe fitting does not have any crackle and destruction when being depressed into the inside and outside wall coincidence.
Hydraulic test: pipe fitting under test pressure requires, ne-leakage and destruction.
Pore-free: with pipe fitting turning processing on lathe, no any pore in whole turning process.
More than test has proved absolutely the advantage of this pipe fitting, and pore-free packing height reaches practical requirement.
Be that example illustrates the pipe fitting quality situation under the different technologies parameter still with Φ 500 flanged fittings:
Under the constant situation of other condition, the one-level cylinder of blank make-up machine is under the situation of no operating pressure, and the pipe fitting that makes has the pore that differs in size, when the operating pressure of one-level cylinder is 0.5MPa, and the pipe fitting pore-free that makes.Under the constant situation of other condition, when the operating pressure of hydraulic press was 7MPa, the pipe fitting flattening test that makes had crackle, and hydraulic test has destruction under the test pressure condition.When the operating pressure of hydraulic press was 15MPa, the pipe fitting that makes was up-to-standard, reaches requirement.
Under the similarity condition, for Φ 800 flanged fittings, during the 15MPa of the pressure of hydraulic press, Φ 800 flanged fittings that make are defective, and when the operating pressure of hydraulic press was adjusted into 25MPa, product quality was qualified.Under the constant situation of other condition, the one-level cylinder of blank make-up machine is under the situation of no operating pressure, and the pipe fitting that makes has the pore that differs in size, when the operating pressure of one-level cylinder is 0.6MPa, and the pipe fitting pore-free that makes.
Under the similarity condition, for Φ 160 flanged fittings, during the 7MPa of the pressure of hydraulic press, the flanged fitting that makes is defective, and when the operating pressure of hydraulic press was adjusted into 8MPa, product quality was qualified.Under the constant situation of other condition, the one-level cylinder of blank make-up machine is under the situation of no operating pressure, and the pipe fitting that makes has the pore that differs in size, when the operating pressure of one-level cylinder is 0.3MPa, and the pipe fitting pore-free that makes.
Claims (4)
1. the manufacture method of a compression moulding forming polyolefin pipe fitting is characterized in that comprising following continuous production stage:
(1), the polyolefin raw material plastifies in extruder;
(2) raw material after the plasticizing enters and is shaped to blank in the blank mold, and wherein controlling forming temperature is 80～210 ℃, pressure 0.3～0.8MPa;
(3) blank enters in the formation of tubes mould and suppresses, and pressing pressure is 8～30MPa, and mould has water cooling plant outward, and going into coolant-temperature gage is 18～25 ℃, has air exit in the mould;
(4) carry out constant temperature behind the formation of tubes and handle, temperature is 10～25 ℃, at least 24 hours time;
(5) mechanical process obtains qualified product.
2. manufacture method according to claim 1, it is characterized in that described step (3) carry out three times the compacting, preceding twice press time was respectively 2-3 minute.
3. equipment of realizing the manufacture method of the described compression moulding forming polyolefin pipe fitting of claim 1, it is characterized in that comprising the single screw extrusion machine of being with drying hopper, the blank make-up machine, the blank conveying device, hydraulic press, the formation of tubes mould, described blank make-up machine comprises platform, be placed on the blank mold on the platform, one-level cylinder that is connected with blank mold and the secondary cylinder that is connected with the one-level cylinder, one-level cylinder and secondary cylinder are rack-mount by adapter sleeve respectively, described blank conveying device is connected between single screw extrusion machine and the blank mold, form by propulsion cylinder and shovel board, described formation of tubes mould is placed on the hydraulic press, and the single screw extrusion machine outlet is connected with the blank mold chamber of blank make-up machine by tube connector.
4. equipment according to claim 3, it is characterized in that described formation of tubes mould comprises die body, core, pressure head, die body has water jacket outward, die body and core form the formation of tubes chamber, be provided with the pusher ring in the end of formation of tubes chamber, the pusher ring connects push rod, pusher ring and push rod are installed on the connector, the push rod end is assembled in pressing plate and moves back on the plate, connector and moving back between the plate links together by pillar, fixed head, be provided with in the middle of the fixed head and move back plate hole, between pusher ring and the forming cavity and the gap that is provided with 0.15～0.2mm between push rod and the connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100137409A CN101254651B (en) | 2007-02-28 | 2007-02-28 | Production method of compression moulding forming polyolefin pipe fitting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100137409A CN101254651B (en) | 2007-02-28 | 2007-02-28 | Production method of compression moulding forming polyolefin pipe fitting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101254651A true CN101254651A (en) | 2008-09-03 |
| CN101254651B CN101254651B (en) | 2010-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007100137409A Expired - Fee Related CN101254651B (en) | 2007-02-28 | 2007-02-28 | Production method of compression moulding forming polyolefin pipe fitting |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101844384A (en) * | 2009-05-27 | 2010-09-29 | 山东天野塑化有限公司 | Preparation method of large-caliber plastic pipe |
| CN105365150A (en) * | 2015-12-07 | 2016-03-02 | 天鼎联创密封技术（北京）有限公司 | Manufacturing device and manufacturing method for sealed product |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101898386B (en) * | 2010-08-17 | 2011-11-30 | 常熟市创新陶瓷有限公司 | Ceramic central spindle moulding mould and method for moulding ceramic shaft by dry type isostatic pressing process |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100493893C (en) * | 2005-03-08 | 2009-06-03 | 华南理工大学 | Extrusion-die pressing precise forming method and apparatus therefor |
| CN1907691B (en) * | 2005-08-03 | 2012-02-22 | 小岛冲压工业株式会社 | Compression molding machine and compression molding method |
| CN201009431Y (en) * | 2007-02-28 | 2008-01-23 | 山东天野塑化有限公司 | Equipment for producing compression moulding forming polyolefin pipe fitting |
-
2007
- 2007-02-28 CN CN2007100137409A patent/CN101254651B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101844384A (en) * | 2009-05-27 | 2010-09-29 | 山东天野塑化有限公司 | Preparation method of large-caliber plastic pipe |
| WO2010135905A1 (en) * | 2009-05-27 | 2010-12-02 | 山东天野塑化有限公司 | Method for manufacturing large diameter plastic pipe fittings |
| CN105365150A (en) * | 2015-12-07 | 2016-03-02 | 天鼎联创密封技术（北京）有限公司 | Manufacturing device and manufacturing method for sealed product |
| CN105365150B (en) * | 2015-12-07 | 2018-08-21 | 天鼎联创密封技术（北京）有限公司 | The producing device and production method of sealed product |
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| Publication number | Publication date |
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| CN101254651B (en) | 2010-06-16 |
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