Specialist In Quality Carbide and Steel Cold Heading Dies
First Header Die, inc.

   

 

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1313 Anvil Rd
Rockford, IL 61115

(815) 282-5161
Fax: (815) 282-5295

 

The comparator when used to check depth is only as accurate as the skill level of the operator. It is critical that the image is focused sharply, the travels have been calibrated, and the machine is in excellent condition with digital read out capacities to avoid mixed interpretations. The power setting must be at least 20x with the ability to go to 50x if necessary. In the case of shallow angles and intersecting radii, a theoretically sharp corner has to be determined with overlays for the reading to be accurate. With some of the more complex readings a con-trace of the cast is the best choice.

ALTERNATIVE METHODS OF INSPECTION AND POSSIBLE SHORTCOMMINGS OF THESE PROCESSES:

Gage pins can and are used for the inspection of I.D. diameters. Pins are very accurate at determining the round diameter of a hole. They will not identify any out of roundness, or any back tapers that exist. On non-round shapes, the pin only identifies the general size and leaves too much for interpretation to be viewed as highly accurate.

PROBLEMS ENCOUNTERED BY THE CUSTOMER ARISING FROM POOR QUALITY IN THE DIE:

  • Parts out of tolerance after heading. If the die isn't thoroughly correct, all aspects of the heading process suffer. Any incorrect dimensions not discovered in the header die will have to be corrected, if possible, by later operations at the screw manufacturer's time and expense.

  • Incorrect press fits of inserts assembled in cases. Many die failures are caused by incorrect press fit. Both too much and too little. This is caused by tri-round O.D.s, inaccurate measurement of the parts, and inexperienced Die Makers assuming incorrectly the proper press needed.
  • Parts not fitting correctly in subsequent dies in multi-die set ups. It is imperative to make sure that the engineering done in multi-station formers is not undermined by die components that are not exactly to specifications denoted by the engineer.

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Main Sections:

Introduction
Face T.I.R.
Surface quality
Length dimensions
High polish
Conclusion

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