Case Study – Medical Equipment

Investment Casting for Medical Surgical Tables

Over the years, our investment casting services here at Waltek, Inc. have proven a good fit for the medical equipment industry. The images highlighted here show five different components we produce for one of our clients. Designed for use on operating tables as well as an adjustable swivel overhead light fixture, these parts consist of a knob, retaining collar, hub, lens driver, and bracket pull housing.

Materials of construction included several grades of steel as well as phosphor bronze. Investment casting using the lost wax methodology allowed us to produce these parts with great accuracy. By paying attention to every geometric detail during mold making and using our computer-controlled and formula-driven casting processes, we achieved excellent consistency in the quality of the cast parts. After casting, we removed all burrs, making sure we flushed them from all internal passages, and then heat treated the parts to impart the desired strength properties. Additional operations consisted of secondary machining, painting, and plating.

Once completed, these parts featured various dimensions in 25 to 250 millimeter (mm) range and weighed from 0.2 to 15 pound (lbs). Dimensional inspections confirmed that we upheld ± .075 millimeter (mm) tolerances, while numerous material tests validated the tensile strength, yield strength, hardness, as well as various other mechanical criteria.

For production to be efficient, it needs to be consistent, and our processes ensured excellent quality from each production run. We continue to cast these parts on a regular basis to hold inventory between minimum and maximum levels, ensuring the parts are available to the customer on a just-in-time basis.

We formed a strategic partnership with this client that encompasses more than 50 different part numbers for which we have established a Kanban stocking program. For many of these parts, we engaged with them at the prototyping stage, where our ability to create functional models within narrow timelines helped them speed their time to market and allowed us to develop systems for a rapid transition to full production levels.

For more information about this project or our investment casting capabilities, contact us today.

Product Description: Parts are used in the Medical Industry. They are used on the operation tables along with the overhead swivel/adjustable lighting used during operations.

Primary Capabilities/Processes Applied: Investment Casting

Secondary Capabilities/Processes Applied: Heat Treat

Equipment Used to Manufacture Part: Autoclave
Cut-Off and Deburring Equipment
Heat Treat Oven
Melting Furnace
Painting and Plating
Pre-heat Oven
Wax Mold

Expertise: Investment Casting

Overall Part Dimensions: Various sizes ranging from 25 mm to 250 mm

Tightest Tolerances (±): 0.75 mm

Material Used: 304L
Phosphorous Bronze 875
SS303 non-magnetic

Material Finish: Painting
Powder Coating

In Process Testing/Inspection Performed: Coordinate Measuring Machine (CMM)
Hardness and Reduction of Area
Testing for Tensile
Viscous Equipment
Yield Strength

Industry for Use: Medical

Weight: Various ranging from .2 lbs to 15 lbs

Delivery/Turnaround Time: 4 weeks on as cast parts and one week per additional operation such as heat treat, plating and painting.

Delivery Location: Mexico

Standards Met: 2D Computer-Aided Design (CAD) Drawing
Customer Specifications

Product Name: Bracket Pull Housing
Lens Driver
Retaining Collar