JP2005153484A - Mold clamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold clamp capable of preventing the damage of a platen bolt hole for mold fastening that is a conventional drawback in an injection molding machine, dispensing with the operation of fitting in an insert while stopping an injection molding work to enlarge the platen bolt hole, and improving workability in mold exchange by holding a strap in space without attaching or detaching. <P>SOLUTION: The mold clamp comprises a strap 1 for fastening the mold, a fastening bolt 2, a striker plate 3 to be screwed by the bolt 2, a supporting bolt 5 screwing in the platen bolt hole, a seat 6, a nut 7 and a lock nut 8 for holding the strap 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

Industrial application fields

  The present invention relates to a general mold clamping apparatus.

The mold of the injection molding machine is used by being tightened to the platen of the machine with bolts, but every time the mold is replaced, a strong tightening operation is performed, and the screw hole provided in the platen is in each case. It wears out and loses its function before the end of its mechanical life. The cause of this is that the torque coefficient increases due to damage to the screw hole as it is used, and the tightening force cannot be secured at the same torque. Therefore, as a result of intending to ensure safety, an excessive tightening force is caused, and the screw hole is inevitably short-lived. Therefore, the work of stopping the injection molding machine, enlarging the screw hole of the platen and fitting the insert is unavoidable, and the cost is also considerable.

Since the platen mounting surface of the platen is vertical, the strap will fall off when the clamping bolt is loosened when changing the die, so the strap needs to be attached and removed each time the die is changed, resulting in poor operability.

Problems to be solved by the invention

In addition to preventing damage to the screw holes in the platen, an inexpensive and easy-to-operate mold clamp is obtained.

Means for solving the problem

In order to achieve the above object, in the “mold clamp” of the present invention, a conventional fastening bolt is used as a strap support bolt and a strap holding lock nut is attached. Tightening is performed by a receiving seat attached to the strap and a fastening bolt.

Action

Since the fastening bolt is fastened between the strap, the seat and the fastening bolt, damage due to screwing of the screw hole of the platen is eliminated. Furthermore, the space of the platen can be maintained by the lock nut on the support bolt.

1 and 2, 1 is a strap, 2 is a tightening bolt, 3 is a seat, 4 is a seat, 5 is a support bolt, 6 is a seat, 7 is a nut, and 8 is a lock nut. The platen 1 has a bar structure with parallel square sections, and the tightening bolt 2 is disposed inside thereof. The receiving seat 3 has a U-shape and is slidably mounted on the platen 1. The fastening bolt 2 is screwed together. The receiving seat 6 has a U-shape and is slidably mounted on the platen 1 in the same manner as the receiving seat 3, and the support bolt 5 passes therethrough.

When the lock nut 8 is loosened and the tightening bolt 2 is tightened, the reaction force of the tightening force via the seat 4 to the platen is transmitted to the strap 1. At this time, the support bolt 5, the seat 6, and the nut 7 serve as fulcrums, and the reaction force is received by the nut 7. The tip of the strap 1 tightens the mold as shown in the figure. In order to make this operation smooth, the receiving seat 6 contacting the platen 1 on the upper and lower surfaces has R2 and the receiving seat 3 has R1.

In FIG. 3, this figure is an example of a clamping force detection seat used instead of the seat 4. 10 is a washer, 11 is an elastic body, 12 is a ring, and a gap G between the washer 10 and the ring 12 is provided. As the tightening bolt 2 is tightened, the elastic body 11 bends and the gap G decreases, eventually becomes zero, and the ring 12 cannot be rotated by the fingertip. This is the specified tightening force. (For details, see Japanese Patent No. 2529835)

The invention's effect

Since the present invention is configured as described above, the following effects can be obtained.

Since the conventional tightening bolt screwed into the platen is replaced with a support bolt for the clamp, damage to the platen screw hole can be prevented. Since the work of the injection molding machine, which was a conventional difficulty, is stopped, the work of enlarging the platen screw hole and fitting the insert becomes unnecessary, the economic effect is remarkable.

Even if the flange thickness of the mold changes, the support bolt 5, the nut 7 and the tightening bolt 2 can be used, so that the conventional work of inverting the strap upside down (upside down) becomes unnecessary.

When the mold bolt is replaced, the platen surface is vertical when the bolt 2 is loosened, so the strap 1 tries to rotate around the support bolt 5 in the direction penetrating the paper surface of FIG. When the bolt 2 is lightly tightened, the strap 1 is fixed and the strap 1 is held in the space. As a result, it is not necessary to attach and detach the strap 1 as in the prior art, and the work time for exchanging the mold is greatly reduced and the workability is improved.

If the tightening force detection seat shown in FIG. 3 is used, the tightening force can be determined based on whether or not the ring can be rotated, so that a conventionally used torque wrench becomes unnecessary. In addition, since only an ordinary spanner is required, the workability of mold change is further improved.

Example side view AA sectional view of "Fig. 1" Cross-sectional view of another embodiment

Explanation of symbols

1 Strap 2 Tightening Bolt 3 Receiving Seat 4 Seat 5 Support Bolt 6 Receiving Seat 7 Nut 8 Lock Nut 10 Washer 11 Elastic Body 12 Ring

Claims (1)

  The strap (1) and the fastening bolt (2) for fastening the mold, the seat (3) and the support bolt (5), the seat (6), and the nut (7) constitute the main functions, and the support bolt Mold clamp with lock nut (8) attached to (5)

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