Making best use of the ceramic characteristics
Our company specializes in machining round products. Our core specialization is machining inner surface of cylinders. Our machining track record includes injection molds/extrusion dies, bush used to guide drills and reamers, jigs such as positioning pins, and ring and plug gages. These products come with functions unique to ceramics such as slidability, rust inhibition, and insulation in addition to wear resistance.
Unfortunately, we cannot display the samples on the website. However, we will introduce the typical machining technology used by our company.
Zirconia ceramics Cylinderical pipe
Silicon nitride Thin wall pipe
Zirconia ceramics Ring with ditch in the I.D.
Fitting technique for piston and cylinder
To move the piston (plunger) smoothly inside the cylinder (syringe), machining the cylinder inner surface with roundness and cylindricity of high accuracy is essential. Our company specializes in machining the inner surface of cylinders (zirconia ceramic cylindrical pipes). The cylindricity of cylinders is maintained below 1 μm enabling the piston to slide smoothly. We also offer consultations for products with special shapes such as large diameter and long cylinders.
Shrink fitting and cooling fitting technology
Ceramics are expensive materials compared to steel materials, in addition to the problem that machining is difficult. Shrink fitting technology is an effective method to make the best use of the characteristics of ceramics such as wear resistance and slidability. Shrink fitting process is as follows. Metal parts used for the outer diameter can be made to expand by heating. Ceramics are inserted into the inner diameter after heating. The outer diameter of the metal will shrink during the cooling process and adhere mechanically to the ceramic. For products where ceramics are used with forged molds, shrink-fitted products are found to be more resistant to cracking than ceramics alone. Since ceramic is used only in the necessary areas with remaining areas made of steel, this improves machineability.
If ceramic is required to be used on the outer diameter, the metal on the inner diameter is cooled and joined to the ceramic by using cooling fit. Ceramics cannot be used for products subject to load because the tensile strength is low.