D-K Manufacturing Corporation
NTSA Precision

Stamping of Stainless Steel Diaphragm Cover for the Field Pump Motor Industry

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Stamping Aida
Stamping of Stainless Steel Diaphragm Cover
Stamping of Stainless Steel Diaphragm Cover

DK Manufacturing used our stamping capabilities to manufacture this stainless steel diaphragm cover, used by a customer in the field pump motor industry. This particular cover is used for the bottom of a submersible water motor pump, so proper material selection and tight tolerances were important. Using several of our stamping presses to carry out various stamping operations on a 16 gage AISI 304 stainless steel base, we successfully manufactured this part, keeping to the tolerance requirement of .005".

The first step in stamping this product was blanking, which we carried out in a gap frame 60 ton press, drawing the cover's outer shape. Next, the forming step defined the cover's outer radius and established a .940" height. We used an 80 ton gap frame stamping press for this. A 3rd press operation pinch trimmed the outer flange to that lower height, and finally a 45 ton press performed two perforation operations: one to perforate three holes in the top of the cover and set the .44" top radius, and a second to perforate 6 holes around the flange. The form dies used in stamping this piece were coated with vanadium carbide, lessening friction and galling between the die and the piece.



Project Highlights

Product Description
  • This diaphragm cover is for the bottom of a submersible water pump motor
Capabilities Applied/ProcessesStamping:
  • operation draw outer shape
  • operation re-strike height to .940” forming outer radius
  • operation pinch trim outer flange to height
  • 4th operation set top radius .44” and perforate 3 holes;
  • operation perforate 6 holes (true position .010” to ID and ID ledge)
Equipment Used to Manufacture Part
  • Blanked in a Gap frame 60 ton press
  • Formed in a 80 ton Gap frame press
  • Perforated in 45 ton press * *
  • Form dies - tooling coated with a Vanadium Carbide Finish to limit tooling from galling; also prevents tearing of the part in the drawing process.
Overall Part Dimensions
  • 3.675” OD x 1.075” High
Tightest Tolerances
  • ±.005”
Material Used
  • AISI 304 Stainless Steel 16 Gage
Typical OperationsStamping:
  • Blank Cut Out Formed Shape

  • Wash Clean
Estimated Part Weight
  • .489 lbs/each
Industry for Use
  • Fluid Pumps Motors
Delivery Time
  • 13 days for prototype; 32 days for short run tooling (soft tooling to use as production tooling until hard tooling finished)
  • 9 weeks for production tooling.
  • 6,000/year
Delivery Location
  • China
Standards Met
  • Customer supplied print, CAD file
Product Name
  • Diaphragm Cover
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