Opening/closing apparatus and molding apparatus

Patent metadata

Field	Value
Publication number	US-10105753-B2
Application number	US-201515522620-A
Country	US
Kind code	B2
Filing date	Oct 26, 2015
Priority date	Oct 28, 2014
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

Abstract

An opening/closing apparatus is provided for use in a molding apparatus, such as an injection molding machine. The opening/closing apparatus may eliminate the influence of a slight gap formed between a bush and a pin in a link connecting portion of a toggle link mechanism and in addition, can enhance workability e.g., in mold replacement. An opening/closing apparatus of the present technology may include an opening/closing mechanism including a toggle link mechanism connecting a pressure-receiving platen and a movable platen; a drive mechanism for driving the opening/closing mechanism; and a core-back hydraulic cylinder for applying a load to the movable platen in a given direction in conjunction with the first drive mechanism, configured to perform the operation of slightly opening of the mold.

First claim

The invention claimed is:

1. An opening/closing apparatus comprising:
a fixed platen to which one of a pair of molds is to be mounted;
a movable platen to which the other mold is to be mounted;
a pressure-receiving platen connected to the fixed platen via tie bars;
an opening/closing mechanism that opens and closes the molds by moving the movable platen back and forth, including a toggle link mechanism connecting the pressure-receiving platen and the movable platen, the toggle link mechanism including a link housing;
a drive mechanism that drives the opening/closing mechanism; and
at least one core-back hydraulic cylinder that applies a load to the movable platen in a given direction in conjunction with the drive mechanism, wherein the at least one core-back hydraulic cylinder is located between the link housing and the movable platen, connecting the movable platen with the pressure-receiving platen, and the load applied by the at least one core-back hydraulic cylinder to the movable platen is in such a direction as to eliminate a gap between a pin and a bush in a link connecting portion of the toggle link mechanism.

2. The opening/closing apparatus according to claim 1 , wherein when opening the molds, the at least one core-back hydraulic cylinder applies the load to the movable platen in a mold opening direction.

3. The opening/closing apparatus according to claim 1 , wherein:
the drive mechanism includes a first drive mechanism and a second drive mechanism; and
when opening the molds, a driving force of the at least one core-back hydraulic cylinder is controlled such that the driving force is lower than a driving force of the first drive mechanism while the second drive mechanism is applying the load to the movable platen in a mold closing direction.

4. The opening/closing apparatus according to claim 1 , wherein the at least one core-back hydraulic cylinder is additionally applying a load to the movable platen in order to perform a core-back operation of opening the molds to increase the volume of a cavity, formed in the molds, after filling a molten resin containing a foaming agent into the cavity.

5. The opening/closing apparatus according to claim 1 , wherein the at least one core-back hydraulic cylinder comprises at least one fluid-pressure cylinder having a cylinder body, at one end, is connected to the movable platen and, at the other end, is connected to the pressure-receiving platen or to a fixing member secured to the pressure-receiving platen so as to exert the load thereon exclusively in the opening direction.

6. The opening/closing apparatus according to claim 5 , wherein the at least one core-back hydraulic cylinder consists of a pair of cylinders whose cylinder bodies are mounted on the pressure-receiving platen.

7. The opening/closing apparatus according to claim 5 , wherein the at least one fluid-pressure cylinder consists of a pair of cylinders whose cylinder bodies are mounted on an opposite surface from a mold mounting surface of the movable platen.

8. The opening/closing apparatus according to claim 1 , wherein the opening/closing apparatus is a mold clamping apparatus provided in an injection molding machine for performing core-back injection foam molding.

9. A molding apparatus comprising the opening/closing apparatus according to claim 1 .

10. The opening/closing apparatus according to claim 2 , wherein the at least one core-back hydraulic cylinder comprises at least one fluid-pressure cylinder having a cylinder body, at one end, is connected to the movable platen and, at the other end, is connected to the pressure-receiving platen or to a fixing member secured to the pressure-receiving platen so as to exert the load thereon exclusively in the opening direction.

11. The opening/closing apparatus according to claim 3 , wherein the at least one core-back hydraulic cylinder comprises at least one fluid-pressure cylinder having a cylinder body, at one end, is connected to the movable platen and, at the other end, is connected to the pressure-receiving platen or to a fixing member secured to the pressure-receiving platen so as to exert the load thereon exclusively in the opening direction.

12. The opening/closing apparatus according to claim 4 , wherein the at least one core-back hydraulic cylinder comprises at least one fluid-pressure cylinder having a cylinder body, at one end, is connected to the movable platen and, at the other end, is connected to the pressure-receiving platen or to a fixing member secured to the pressure-receiving platen so as to exert the load thereon exclusively in the opening direction.

13. The opening/closing apparatus according to claim 2 , wherein the opening/closing apparatus is a mold clamping apparatus provided in an injection molding machine for performing core-back injection foam molding.

14. The opening/closing apparatus according to claim 3 , wherein the opening/closing apparatus is a mold clamping apparatus provided in an injection molding machine for performing core-back injection foam molding.

15. A molding apparatus comprising the opening/closing apparatus according to claim 2 .

16. A molding apparatus comprising the opening/closing apparatus according to claim 3 .

Assignees

• Toshiba Machine Co Ltd

Inventors

• Miyauchi Takaki
• Koike Jun
• Kitta Hideaki
• Onuma Hiroyuki
• Kinoshita Masato

Classifications

• B29C44/58

  Moulds · CPC title

• B29C45/68

  hydro-mechanical · CPC title

• B29C45/683

  using both a toggle mechanism as mould closing device and another mechanism as mould clamping device · CPC title

• B29C45/681

  using a toggle mechanism as mould clamping device · CPC title

• B22D17/26 Primary

  Mechanisms or devices for locking or opening dies · CPC title