JPS57207027A - Method of injection molding cylindrical parts - Google Patents
Method of injection molding cylindrical partsInfo
- Publication number
- JPS57207027A JPS57207027A JP9230781A JP9230781A JPS57207027A JP S57207027 A JPS57207027 A JP S57207027A JP 9230781 A JP9230781 A JP 9230781A JP 9230781 A JP9230781 A JP 9230781A JP S57207027 A JPS57207027 A JP S57207027A
- Authority
- JP
- Japan
- Prior art keywords
- pressurizing
- pressure
- piston
- cooling
- cavity
- 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.)
- Pending
Links
- 238000001746 injection moulding Methods 0.000 title 1
- 238000000034 method Methods 0.000 title 1
- 238000001816 cooling Methods 0.000 abstract 3
- 230000007423 decrease Effects 0.000 abstract 2
- 238000002347 injection Methods 0.000 abstract 2
- 239000007924 injection Substances 0.000 abstract 2
- 239000011347 resin Substances 0.000 abstract 2
- 229920005989 resin Polymers 0.000 abstract 2
- 238000000465 moulding Methods 0.000 abstract 1
Classifications
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
- B29C45/561—Injection-compression moulding
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
PURPOSE:To make possible to injection mold a cylindrical parts improved in the out of roundness and the accuracy of the recess in the cylindrical outer surface, by setting a plastic with a core pin being moved toward a stationary mold when the pressure in the cavity decreases. CONSTITUTION:A molten resin injected from a molding machine is loaded through a gate 1 into the cavity 9, and after several seconds, pressure is applied. The start of the pressurization by a hydraulic cylinder 22 is done by a pressurizing signal from a relay by setting the time after the start of the injection by a timer. When the pressurizing is started, and the resin pressure in the cavity 9 begins to decrease due to the cooling, a piston 24, a nut 26, a pressure transmitting plate 25, a pressurizing plate 18, a pressurizing auxiliary plate 19 and a core pin 11 are integrally moved toward the stationary mold 5. The pressurizing step is completed a little before the completion of the cooling, and the piston 24 is moved to the original position where the piston 24 is located before the start of the pressurization. After the completion of the cooling, the molds are opened, and the sprue, gate, runner and plastic parts are removed from the molds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9230781A JPS57207027A (en) | 1981-06-17 | 1981-06-17 | Method of injection molding cylindrical parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9230781A JPS57207027A (en) | 1981-06-17 | 1981-06-17 | Method of injection molding cylindrical parts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57207027A true JPS57207027A (en) | 1982-12-18 |
Family
ID=14050741
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9230781A Pending JPS57207027A (en) | 1981-06-17 | 1981-06-17 | Method of injection molding cylindrical parts |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57207027A (en) |
-
1981
- 1981-06-17 JP JP9230781A patent/JPS57207027A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0637495B1 (en) | Apparatus and method for local pressurizing type injection molding | |
| EP1101592A3 (en) | Electrically-operated injection molding method | |
| EP0397883A4 (en) | Injection compression molding machine and its molding method | |
| JP2807619B2 (en) | Resin molding machine | |
| US5057255A (en) | Molding method and molding apparatus in an injection-compression molding machine | |
| EP0484549A4 (en) | Method of controlling molding cycle of injection molding machine | |
| JP3185197B2 (en) | Injection molding method | |
| US4844847A (en) | Method and apparatus for controlling injection molding machines | |
| JPS6152780B2 (en) | ||
| JPS6021225A (en) | Injection compression molding method | |
| JPS57207027A (en) | Method of injection molding cylindrical parts | |
| GB1509844A (en) | Injection moulding machine and method | |
| JPH03193428A (en) | Injection mold | |
| JPS56121748A (en) | Injection molding method | |
| JPS5591642A (en) | Holding device for inserted body at enclosing molder | |
| JPS6328783B2 (en) | ||
| JPS5796833A (en) | Method of injection-compression molding | |
| JP2711923B2 (en) | Injection mold manufacturing method | |
| JPS56106837A (en) | Method and apparatus for injection molding | |
| JPS5796834A (en) | Method of injection-compression molding | |
| JPS5669137A (en) | Laminated structure molding method | |
| JPS57156867A (en) | Hot chamber die casting machine | |
| JPS5795430A (en) | Injection and compression molding machine | |
| JPH0623811A (en) | Secondary pressurization mold and injection molding method | |
| JPH0518115Y2 (en) |