Mold clamping device and injection molding machine

Patent metadata

Field	Value
Publication number	US-11926084-B2
Application number	US-202217592813-A
Country	US
Kind code	B2
Filing date	Feb 4, 2022
Priority date	Feb 5, 2021
Publication date	Mar 12, 2024
Grant date	Mar 12, 2024

Abstract

There are provided a mold clamping device and an injection molding machine including a guide mechanism which reliably prevents falling of a movable platen. The mold clamping device includes: a fixed platen fixed to a bed; a mold clamping housing configured to be slidable on the bed; a movable platen configured to be slidable on the bed between the fixed platen and the mold clamping housing; a plurality of tie-bars connecting the fixed platen and the mold clamping housing and penetrating the movable platen; a mold clamping mechanism provided between the mold clamping housing and the movable platen; a linear guide provided with the movable platen and configured to slide with respect to the bed; and a tie-bar guide bush provided with the movable platen and configured to slide with respect to the tie-bar.

First claim

What is claimed is:

1. A mold clamping device comprising:
a fixed platen fixed to a bed;
a mold clamping housing configured to be slidable on the bed;
a movable platen configured to be slidable on the bed between the fixed platen and the mold clamping housing;
a plurality of tie-bars connecting the fixed platen and the mold clamping housing and penetrating the movable platen;
a mold clamping mechanism provided between the mold clamping housing and the movable platen;
a linear guide provided with the movable platen and configured to slide with respect to the bed; and
a tie-bar guide bush provided with the movable platen and configured to slide with respect to the tie-bar,
wherein, in the movable platen, the tie-bar guide bush is provided for the tie-bar disposed only in an upper portion among the plurality of tie-bars, and
wherein the tie-bar guide bush is a part of a hollow cylinder having a C-shaped cross section in a radial direction, and is in contact with a lower side of an outer circumference of the tie-bar.

2. The mold clamping device according to claim 1 ,
wherein the tie-bar guide bush has a selected inner diameter so as to be clearance-fitted to the tie-bar in a state of loose running fit.

3. The mold clamping device according to claim 1 , wherein the mold clamping mechanism comprises a toggle mechanism provided between the slidable mold clamping housing and the movable platen.

4. The mold clamping device according to claim 1 , wherein an inner diameter of the tie-bar guide bush is 0.145 mm or more greater than an outer diameter of the tie-bar.

5. The mold clamping device according to claim 1 ,
wherein the movable platen has a plurality of guide holes,
wherein the plurality of tie-bars penetrates the respective guide holes of the movable platen, and
wherein the tie-bar guide bush is provided in the guide holes of the movable platen and is configured to slide with respect to the tie-bar.

6. An injection molding machine comprising:
an injection device configured to inject a resin; and
a mold clamping device configured to clamp a mold,
wherein the mold clamping device comprises:
a fixed platen fixed to a bed;
a mold clamping housing configured to be slidable on the bed;
a movable platen configured to be slidable on the bed between the fixed platen and the mold clamping housing;
a plurality of tie-bars connecting the fixed platen and the mold clamping housing and penetrating the movable platen;
a mold clamping mechanism provided between the mold clamping housing and the movable platen;
a linear guide provided with the movable platen and configured to slide with respect to the bed; and
a tie-bar guide bush provided with the movable platen and configured to slide with respect to the tie-bar,

wherein, in the movable platen, the tie-bar guide bush is provided for the tie-bar disposed only in an upper portion among the plurality of tie-bars, and
wherein the tie-bar guide bush is a part of a hollow cylinder having a C-shaped cross section in a radial direction, and is in contact with a lower side of an outer circumference of the tie-bar.

7. The injection molding machine according to claim 6 ,
wherein the tie-bar guide bush has a selected inner diameter so as to be clearance-fitted to the tie-bar in a state of loose running fit.

8. The injection molding machine according to claim 7 , wherein an inner diameter of the tie-bar guide bush is 0.145 mm or more greater than an outer diameter of the tie-bar.

9. The injection molding machine according to claim 6 , wherein the mold clamping mechanism comprises a toggle mechanism provided between the slidable mold clamping housing and the movable platen.

10. The injection molding machine according to claim 6 ,
wherein the movable platen has a plurality of guide holes,
wherein the plurality of tie-bars penetrates the respective guide holes of the movable platen, and
wherein the tie-bar guide bush is provided in the guide holes of the movable platen and is configured to slide with respect to the tie-bar.

Assignees

• Japan Steel Works Ltd

Inventors

• Matsuura Kyouhei

Classifications

• B29C45/67 Primary

  hydraulic · CPC title

• B29C45/1747

  Tie-rod connections · CPC title

• B29C45/1756

  Handling of moulds or mould parts, e.g. mould exchanging means (moulds per se B29C45/26) · CPC title

• B29C45/1761 Primary

  Means for guiding movable mould supports or injection units on the machine base or frame; Machine bases or frames (B29C45/1747 takes precedence) · CPC title

• B29C2045/688

  using tie rods as separate elements for clamping · CPC title