JPS55128418A - Mold free from generating burr - Google Patents
Mold free from generating burrInfo
- Publication number
- JPS55128418A JPS55128418A JP3736679A JP3736679A JPS55128418A JP S55128418 A JPS55128418 A JP S55128418A JP 3736679 A JP3736679 A JP 3736679A JP 3736679 A JP3736679 A JP 3736679A JP S55128418 A JPS55128418 A JP S55128418A
- Authority
- JP
- Japan
- Prior art keywords
- fulcrums
- mold
- cavity
- clamping
- upper mold
- 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.)
- Granted
Links
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
PURPOSE: To prevent the generation of burr by the action of tight clamping and close adhesion of cutting portions provided in surfaces which are abutted on to each other, by a method wherein convexities are provided in an outer surface of a thin type mold, and fulcrums of the pressure applied on an outer surface of the mold are positioned in places different from fulcrums of a mold abutting surface when mold-clamping is performed.
CONSTITUTION: Cavities 12, 12 are provided at lower mold 10, upper mold 11 is made of comparatively thin metal plate, and while gates 13, 13 are provided at the positions corresponding to cavities 12, 12, projection 15 which is smaller than the cavity surface is provided at the surrounding of gate opening 13 of outer side 11a. When the clamping force is applied on this location, there occurs the dislocation of fulcrums (i.e. points of force) between the fulcrums A, A which are the pressure fulcrum being applied on the outer side 11a of upper mold and the fulcrums B, B of the metal mold abutting face which are the sides of the cavity faces of fulcrums A, A. This dislocation causes a slight bend of upper mold 11 warping toward the inside of cavity 12 (shown by the dotted line in the Fig.), which makes fulcrums B, B of the abutted face of the molds, i.e., cutting portion 14, clamp tightly, resulting in the complete closure of cavity 12.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3736679A JPS55128418A (en) | 1979-03-29 | 1979-03-29 | Mold free from generating burr |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3736679A JPS55128418A (en) | 1979-03-29 | 1979-03-29 | Mold free from generating burr |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55128418A true JPS55128418A (en) | 1980-10-04 |
JPS6157163B2 JPS6157163B2 (en) | 1986-12-05 |
Family
ID=12495522
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3736679A Granted JPS55128418A (en) | 1979-03-29 | 1979-03-29 | Mold free from generating burr |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55128418A (en) |
-
1979
- 1979-03-29 JP JP3736679A patent/JPS55128418A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS6157163B2 (en) | 1986-12-05 |
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