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What Is Mold Clamp Bolt Torque?
Original: Original | Author: Jasmine HL of DGMF | Publish Time: 2020-02-22 | 8669 Views | Share:
To understand mold clamp bolt torque, one needs to understand what torque is and how it is determined.

To understand mold clamp bolt torque, one needs to understand what torque is and how it is determined.

Torque is the stretching of the bolt and platen threads to maximize the strength of the fastener or mold clamp.

The mold clamp bolt torque will be much higher than the maximum torque requirements of the platen, so the machine torque specifications are important to follow. Often, mold setup engineers will have a false sense of security and will over tighten the mold clamp bolts believing the mold clamps will hold more weight. This is actually the opposite of what is occurring. The strength of the mold clamp declines when the bolt is torqued over the torque specification. The over-torquing of the mold clamp bolts strip the platen threads and actually raises the area around the threads and may cause the mold to sit unparalleled in the platen. Once you have over-torqued mold clamp bolt threads, the threads do not relax to the original condition. This is what causes Gaulding of the threads.

SAE Torque Standards For Bolts

The SAE has established a sequence of grades from 0 to 8 for steel bolts, on the basis of the metal from which the bolt is made and the manner of manufacture.

Please see below data for reference.
DGMF Mold Clamp Bolt Torque

Such as Grade 5 bolts are Suggested Torque Settings in foot-pounds as below:

1/4": 7 foot-pounds

5/16": 14 foot-pounds

3/8": 25 foot-pounds

7/16": 40 foot-pounds

1/2": 60 foot-pounds

9/16": 88 foot-pounds

5/8": 120 foot-pounds

3/4": 200 foot-pounds

7/8": 302 foot-pounds

1": 466 foot-pounds

For a practical case:

If the smallest machine is 55 tons and the biggest one is 500 tons. Is there an industry standard for how much torque a setup person will use to clamp a mold? Normally use M16 and M20 bolts.

Many industry people would recommend generic values around 80-120 foot-pounds but they usually assume ideal situations.

We typically recommend around 50-60 foot-pounds. If the diameter of the platen bolts is larger on your biggest machines, you may be able to go a little higher. The two main factors would be the weight of the mold, and the condition of the platen.