Excellence in Shot Sleeve Production.
At Precision Tool, we carry a large inventory of H-13 tool steel bar stock up to 12 in. diameter. This steel meets premium H-13 specifications such as NADCA standard #207-90. When your order is received we begin work on it within one day. The steel blank is cut and transferred to one of our
square head turret lathes for rough boring. After boring the sleeve is faced and the OD is rough turned to within 0.080 in. Mill work such as pour hole, gates and runners are machined in and then the customer's drawing number, the ID size and date are steel stamped on the end. The sleeves are then sent to heat treatment. Following heat treat, the shot sleeve ODs are turned to 0.015 in. oversize, and then facing to finish length is performed on the die end. Two additional operations are performed on the ID to ensure optimum finish. Grinding takes the diameter to within 0.015 in. of finish. Finish grinding before honing helps eliminate any humps or valleys, especially around the pour hole
area. The final sizing operation is then done on a horizontal hone. When honing is completed the parts are
transferred to a cylindrical grinder for removal of the remaining 0.015 in. stock on the outside diameter. OD grinding is not a common practice but we have found it a must to assure the die caster minimum
run out and the best possible concentricity.
Next: Excellence in Heat Treatment