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Gate cutting machine for disc moulding machine

A technology of cutting device and control device, which is used in the manufacture of optical record carriers, optical record carriers, household components, etc., can solve the problems of mold opening not being able to be performed at timing and constant speed, molding defects, etc.

Inactive Publication Date: 2003-09-17
SUMITOMO HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the conventional gate cutting device of the disc molding equipment, since the stretching force is maintained even when the mold starts to open, the mold opening cannot be performed at a timing and a constant speed
Therefore, molding defects sometimes occur due to improper mold release

Method used

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  • Gate cutting machine for disc moulding machine
  • Gate cutting machine for disc moulding machine
  • Gate cutting machine for disc moulding machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] Next, embodiments of the present invention will be described in detail with reference to the drawings.

[0017] figure 1 is a cross-sectional view of a disc molding apparatus according to an embodiment of the present invention, with the mold in an open state.

[0018] figure 1 Among them, the reference numeral 11 represents the fixed platen, and the reference numeral 12 represents the fixed side assembly, which is fixed to the fixed platen 11 by bolts 13 and plays the role of a fixed mold. The fixed-side assembly 12 includes: a fixed-side base plate 15; a fixed-side circular plate 16, which is fixed to the fixed-side base plate 15 by bolts 17; an annular fixed-side guide ring 18, which is arranged to surround the fixed-side disc plate 16 and pass through The bolt 19 is fixed to the fixed side base plate 15; the positioning ring 23 that is arranged on the fixed side base plate 15 facing the fixed platen 11 and is used to position the fixed side base plate 15 relative t...

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PUM

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Abstract

The gate cutting device of the disc molding equipment includes a fixed mold and a movable mold that faces the fixed mold and can be advanced and retracted. When the mold is clamped, the moving mold and the fixed mold form a cavity. The runner faces the cavity and has a concave portion at the front end. The cutting punch reciprocably faces the cavity and is located at a position corresponding to the concave portion. The cutting punch advances into the concave portion. There is also a drive section which, when driven, advances and retracts the cutting punch. The driving part control assembly drives the driving part to move the cutting punch forward with a predetermined stretching force during mold clamping to perform gate cutting, and make the stretching force less than a preset value before the mold is opened.

Description

technical field [0001] The present invention relates to a gate cutting device and method for disc molding equipment. Background technique [0002] In an injection molding machine, heated and molten resin, usually in a heating cylinder, is fed into a cavity formed in a mold assembly. After the molten resin has cooled and solidified in the cavity, the molded product is removed from the cavity. [0003] For injecting the resin, a screw is provided inside the heating cylinder. When the screw moves forward, the resin is injected from the injection nozzle set at the front end of the heating cylinder. Then, the injected resin enters the cavity through the runner and gate. [0004] A disc molding apparatus for molding discs is provided with a gate cutting device. After the resin is loaded into the cavity, the gate cutting device operates to separate the molded base in the cavity from the gate and form a hole in the center of the molded base. [0005] More specifically, the gate...

Claims

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Application Information

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IPC IPC(8): G11B7/26B29C45/26B29C45/38
CPCB29C45/263B29C45/38Y10S425/81
Inventor 石川笃
Owner SUMITOMO HEAVY IND LTD