CNC machining of stainless steel precision parts for medical device manufacturing solutions

Stainless steel material performance and use solutions:

Stainless steel 316: corrosion resistance and high-temperature strength is particularly good, can be used in harsh conditions, have good process hardening, non-magnetic. Used in seawater equipment, chemical, dye, paper, oxalic acid, fertilizer production equipment, photographic, food industry, coastal facilities, and other solutions.

Stainless steel 304: good corrosion resistance, heat resistance, low-temperature strength, and mechanical properties, stamping and bending and another hot workability, no heat treatment hardening phenomenon, non-magnetic. Widely used in household goods (1, 2 tableware), cabinets, indoor piping, water heaters, boilers, bathtubs, auto parts, medical appliances, building materials, chemicals, the food industry, agriculture, and ship parts.

3. Stainless steel 321: Ti added to 304 stainless steel, so excellent resistance to intergranular corrosion; high-temperature strength and high-temperature oxygen resistance; high cost, poor processability than SUS304 stainless steel. Heat-resistant materials are mostly used in automobiles, aircraft exhaust pipes, boiler furnace covers, piping, chemical devices, and heat exchangers.

Technical solutions for machining aluminum parts

1. Rough machining: The machining dimensional accuracy and surface roughness of some aluminum alloy parts are not easy to meet the requirements of high precision, and some parts with complex shapes need to be roughly machined before processing and cut in combination with the characteristics of aluminum alloy materials. The heat generated in this way will lead to cutting deformation, increase the error of part size in different degrees, and even lead to deformation of the workpiece. For the rough machining of generally flat surfaces, milling and planing are used. Coolant is added to cool the workpiece to reduce the impact of cutting heat on machining accuracy.

2. Finishing machining: In the processing, high-speed cutting will produce a large amount of cutting heat, although the debris can take away most of the heat, the blade can still produce a very high temperature, due to the low melting point of aluminum alloy, the blade is often semi-melting, so that the strength of the cutting point is affected by high temperature, easy to produce aluminum alloy parts in the process of forming bump defects. In the finishing process, usually choose the cutting fluid with good cooling performance, good lubrication performance, and low viscosity. In lubricating tools, timely take away the cutting heat, reduce the temperature of tools and parts processing surface, and reduce the temperature deformation of parts.

3. Processing benchmark selection: processing benchmark should be consistent with the design benchmark, assembly benchmark, and measurement benchmark as far as possible, processing technology should give full consideration to the stability of the parts, positioning accuracy, and clamping reliability.

4. Reasonable choice of tool: Compared with ferrous metals, aluminum alloy material produces a relatively small cutting force during cutting, which can adopt a larger cutting speed and easily form chip tumors. The thermal conductivity of aluminum alloy is very high. There is more heat from the debris and parts during the cutting process, the temperature of the cutting area is lower, the durability of the tool is higher, and the temperature rise of the parts themselves is faster, which can easily cause deformation. Selecting the right tool material, choosing a reasonable tool angle, and improving the surface roughness of the tool are very effective in reducing the cutting force and cutting heat.

5. Use heat treatment and cold treatment to solve the processing deformation: heat treatment methods to eliminate the processing stress of aluminum alloy materials include: artificial promptness, recrystallization annealing, etc. The simple structure of the parts process route is generally used: rough machining, manual just-in-time, and finishing. For the process route of parts with complex structures, generally use rough machining, artificial promptness (heat treatment), semi-finishing machining, artificial promptness (heat treatment), and finishing machining.

Packing: Inner is Poly foam, out is carton. Then pallet. Carton size: 29*19*19.5CM and 23.5*17.5*8, CM and pallet size is: 215*100*90CM, or as your requirement.

Packing for CNC Aluminum parts:

1. Usual packing: By pearl cotton/bubble bag/plastic wrap + carton box, 0.5-10kg/carton box.

2. Special packing(for large part/large quantity order): By pearl cotton/bubble bag/plastic wrap +carton box+wooden box.

3. As customers' requirement for CNC aluminum parts