We have more than 60% of the domestic market share in the manufacture of stainless steel balls for valves.
Ultra-high-quality spherical processing is our core technology.
The strength of our company is “the ultra-precision sphere processing technology(spherical processing technology extremed in surface smoothness and high sphericity.)This is our unique technology developed by more than half a century of valve ball manufacturing performances. In general, there are not many companies that possess highly accurate technique of both cutting works and polishing works. We have been improving the accuracy of sphericity and surface roughness by developing unique in-house facilities for the sphere polishing process.
Our Original Facilities
･Dedicated lathe for spherical surface ･Dedicated polishing machine for spherical surface ･Dedicated lapping machine for spherical surface ･Dedicated buffing machine for spherical surface
Polishing only can be accepted. We can process any material into a sphere.
Whatever Material Can be Rounded. For example, we are flexible to work with new materials such as special resins. This is because we can manufacture almost any material available on the market for valve ball production. We have ultra-high-quality technology for processing difficult-to-machine materials such as stainless steel, titanium, hastelloy, nickel alloy spraying, and tungsten carbide spraying.
We are also working on the development and OEM production of spherical parts for the medical field (hip implants, etc.) by utilizing our technology. We are also looking for joint partners overseas as well, just like in Japan. (Domestic actual performance: supplying products to the three major manufacturers of medical field.)
High Quality Sphere Processing Accuracy
Achievement of a good balance between spherical accuracy and surface roughness had enabled us to manufacture an ultra-high precision endoprosthesis. The balance between the two are a tradeoff relationship that if one side’s accuracy is pursuit, the counterpart’s accuracy becomes rough which complicates the achievement of the both. Our company had pursuit the accuracy of both side to the limit as much as possible, and had achieved the means for the mass production.
Comparison of sphericity and surface roughness accuracy.*Metal material (Cobalt-chronium alloy)
Kida Valve Ball Products
Other Company’s Products
Sphericity Accuracy
0.1～0.3micron
1.5～3.0micron
Surface Roughness
Ｒａ0.01～0.03micron
Ｒａ0.06～0.10micron
Table of Materials
Austenitic Stainless（SUS303・SUS304・SUS304L・SUS316・SUS316L・SUS317,etc.)Martensitic Stainless（SUS630・SUS403・SUS440C,etc.)Duplex Stainless（SUS329J1・SUS329J4・254SMO,etc.)Iron in General(SS・S45C・SUJ2・SCM435,etc.)Brass、Aluminum、Monel、Carpenter、Inconel、Metco 16C、Incoloy、Colmonoy、Zirconium、KovarGunmetal、Titanium、Hastelloy、Tantalum、Ceramic、Stellite、Tungsten Carbide、Cobalt Chrome、Magnesium、Aluminum Bronze
We excel at press cutting, press production (hot forging), mainly with stainless steel material. We provide high-mix low-volume products in short delivery time, low price with high quality. (One unit weight from 0.2kg to 15kg, outer diameter from 50Φ to 250Φ).
②Sphere Cutting
We make full use of our original sphere processing machine (lathe, polishing, lapping) to provide spheres and cutting process parts of the world’s highest level.
③Spherical Polishing
Spherical polishing is performed utilizing our original machineries such as spherical cylindrical polisher, spherical cup polisher and spherical lapping board to achieve precision limit, sphericity accuracy of less than 1μm and ultra-high accuracy in surface roughness of less than Ra 0.03 leveraging our long years of process experience and accumulated know-how.
④Spherical Buffing Process
Spherical buff polishing is a very difficult process, and specially, the working process to buff surface roughness to mirror finishing while maintaining spherical accuracy is unique to our own. Using several kinds of buffs and polishing materials enables our ultra-high sphericity (sphericity accuracy + surface roughness).
⑤Inspection
In response to our customer’s request who particularly requires accuracy, we perform accuracy inspection from various aspect and only release what we can receive 100% confidence from our customers.
⑥Packing and Shipment
We use our original dedicated polyethylene tray for the valve balls to avoid interference during the delivery of the products. We pack them one by one carefully to deliver safe products to our customers.
