GB976874A - Improvements in or relating to the manufacture of pressure cast articles - Google Patents
Improvements in or relating to the manufacture of pressure cast articlesInfo
- Publication number
- GB976874A GB976874A GB692661A GB692661A GB976874A GB 976874 A GB976874 A GB 976874A GB 692661 A GB692661 A GB 692661A GB 692661 A GB692661 A GB 692661A GB 976874 A GB976874 A GB 976874A
- Authority
- GB
- United Kingdom
- Prior art keywords
- moulding
- chamber
- pressure
- passage
- piston
- 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.)
- Expired
Links
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
- B29C45/64—Mould opening, closing or clamping devices
- B29C45/68—Mould opening, closing or clamping devices hydro-mechanical
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/08—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled
- B22D17/10—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled with horizontal press motion
-
- 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
-
- 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
- B29C45/53—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
- B29C45/54—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston and plasticising screw
- B29C45/541—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston and plasticising screw using a hollow plasticising screw co-operating with a coaxial injection ram
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
976,874. Injection moulding machines. J. VON STERNBERG. Feb. 24, 1961 [Feb. 26, 1960], No. 6926/61. Heading B5A. [Also in Division B3] In a moulding process e.g. an injection moulding or metal casting process, material to be moulded is pressed into a moulding chamber by an hydraulically actuated piston and an inlet passage leading to the moulding chamber is then sealed with the co-operation of the pressure present in the moulding chamber, whereupon an extremely high pressure is applied to the material, this pressure being developed by the thermal expansion of a medium e.g. mercury or Wood's metal, which is heated in a pressure vessel. In operation synthetic plastics material is fed into a hopper 4 and passes to a screw chamber 5 containing a feed screw 6 rotated by means of gearing 7, 8. The feed screw 6 has an axial bore which contains an annular piston 12 and a piston rod 15 operated independently by hydraulically actuated pistons 14, 17 respectively. The annular piston 12 has a groove 13 so that material may be fed into an injection chamber 10 by the feed screw 6. The chambers 5 and 10 are electrically heated by heaters 9, 11 respectively. The piston 12 is advanced to inject the material into the mould chamber 50 through an injection passage 19. The piston rod 15 is then advanced so that the end 16 thereof enters the passage 19 and a seal 21 fixed to the end 16, having a conical recess seals the passage by virtue of the pressure in the moulding chamber which presses the edges of the seal 21 against the walls of the passage 19. The material in the moulding chamber 50 is now subjected to an extremely high pressure e.g. 300,000 atmospheres, generated by the thermal expansion of a medium heated in chambers 23 connected in parallel to a bore 22 in the apparatus. This heating is effected by a heat exchanger 24 or by induction heating. After cooling of the medium the moulding chamber 50 is opened by movement of the mould half 26 to the right in Fig. 1 and the moulding article e.g. a gearwheel, is ejected by further advance of the piston rod 15. The means used for moving the mould half 26 and for locking it in the closed position is shown in Fig. 8. The mould half 26 is mounted on a block 34 and the moulding chamber is closed by movement of the block to the left in Fig. 8 by an hydraulic cylinder and piston (not shown), whereupon spaced bars 36 are moved clear of the spaces between bars 37 mounted on a plate 38. A cam member 45 is then moved to the left in Fig. 8 to cause the bars 37 to move upwards so that the ends of the bars 36 and 37 engage to hold the moulding chamber closed. Further movement of the cam member 45 causes a wedge 39 to move upwards to lock the bars in this position. All parts of the apparatus which are subjected to the extremely high pressure are pre-treated with this pressure to strengthen them before use. In Fig. 6, a block 30 to form a mould half is pressed against a die by a pressure medium in the passage 19, and is then subjected to the extremely high pressure as before. A seal 33 is provided to prevent leakage of the pressure medium.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEST016159 | 1960-02-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB976874A true GB976874A (en) | 1964-12-02 |
Family
ID=7456964
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB692661A Expired GB976874A (en) | 1960-02-26 | 1961-02-24 | Improvements in or relating to the manufacture of pressure cast articles |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB976874A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004502568A (en) * | 2000-07-07 | 2004-01-29 | インジェニーア ヴァルター ヘンクスト ゲゼルシャフト ミット ベシュレンクテル ハフツング ウント コンパニー コマンディートゲゼルシャフト | Apparatus and method for melting and transporting material |
CN112140424A (en) * | 2020-08-27 | 2020-12-29 | 李龙方 | Energy-concerving and environment-protective plastics heated board forming device |
-
1961
- 1961-02-24 GB GB692661A patent/GB976874A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004502568A (en) * | 2000-07-07 | 2004-01-29 | インジェニーア ヴァルター ヘンクスト ゲゼルシャフト ミット ベシュレンクテル ハフツング ウント コンパニー コマンディートゲゼルシャフト | Apparatus and method for melting and transporting material |
CN112140424A (en) * | 2020-08-27 | 2020-12-29 | 李龙方 | Energy-concerving and environment-protective plastics heated board forming device |
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