Project Description

Case Study: Catcher, Tension Bar, and Base Cap & Body

Catcher Tension Bar

Market Segment: Lawn & Garden / Off-Highway
Materials: MIM 17-4 PH stainless steel & 4605 low-alloy steel
Density: 7.5 g/cm3
Ultimate Tensile Strength: 1,400 MPa
Yield Stength: 1,400 MPa
Hardness: 42–48 HRC

End Use and Function
These parts are used in proportional valves used in hydraulic circuits of off-highway and farming equipment.

Fabrication
The two parts forming the new base are made of MIM 17-4 PH stainless steel, while the catcher and tension bar are formed of 4605 low-alloy steel. All dimensions of the two parts forming the new base are achieved in the as-MIM condition, including the internal thread in the body. The catcher receives a grinding and burnishing to attain the OD tolerance and surface finish, while the tension bar needs only a turning operation to form an external thread without a parting line. Heat-treated properties include a minimum density of 7.5 g/cm³, 1,550 MPa ultimate tensile strength, yield strength of 1,400 MPa, 3% elongation, and 42–48 HRC hardness range.

Results
The parts were formerly produced via machining, welding, conventional PM, and fastening. By completely re-designing the parts to maximize the advantages MIM offers, the customer obtained savings estimated at 65%, with annual production of 350,000.