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Processing technology

Grinding
We are capable of submicron-level precision processing. 
Centerless grinding
Outer diameter: 0.0002 mm or less, Surface roughness: 0.0002 mm or less, Roundness: 0.0001 mm or less
Plane grinding
Perpendicularity: 0.001 mm or less, Surface roughness: RY 1.0 μ or less 
R grinding
Surface roughness: RY 0.3 μ or less
Super finish grinding
Surface roughness: RY 0.2 μ or less

Resin grinding
We process the inner and outer diameters to submicron levels of precision. 
Surface roughness:　0.0008 mm or less, Roundness: 0.0008 mm or less

Turning
We are capable of micron-level precision processing. 
NC lathes　Processing diameter: φ1.0–φ20.00, Processing length: L = 2.0–350.00 
Cam automatic lathes　Processing diameter: φ1.5–φ10.00、Processing length: L = 5.0–50.00 
Escomatic　Processing diameter: φ0.60–φ4.0 　Processing length: L = 1.0–50.0

Form rolling
Straight knurl, knurling, and screws

Lead screw
We have obtained a surface that slides smoothly. 

Heat treatment
Bright continuous quenching furnace
Vacuum quenching furnace
We set our processing time so as to achieve both hardness and toughness.
Subzero treatment
This process achieves a high degree of hardness and stabilization.
Nitriding
The quench-hardened layer has a thickness of 1 mm or less.
High-frequency quenching furnace
The surface is heated inside the high-frequency coil.
Carburization quenching furnace
This quenching process is conducted inside a carburizer.

Surface treatment
Passivation
Antirust treatment of SU303 and 304.
Barrel processing
Surface roughness processing (processing to achieve the desired surface roughness)
Antirust treatment
Electroless nickel plating
Alumina–silicaless processing
When this processing is performed on spindle motors or HDDs, it removes alumina–silica, which is considered to be a harmful substance.
Surface roughness processing of specified areas
This enables controlling the surface roughness within a specified area. 
It is effective in preventing metal seizure and the reduction of energy consumption.

Micro-diameter processing
At Shinwa Seikou’s world-class engineering department, we have several equipment that cannot be found elsewhere.
 Processing diameter: φ0.4　± 0.001 mm 
 Processing length: L = 1.0 mm or more 
Roundness: 0.001 mm or less 
Surface roughness: RY 0.3 μ or less

Other processing
Pipe processing (Seamless/Semiseamless)
Materials: SUS303, SUS304, SUS316, and SUS305 
Pressing
Zinc chromate coating
Heading
Materials: SWCH, XM7 
Sintering parts
Material: Iron based SUM
Assembly product
We offer cost reduction by combining with BSBM.

Product information

Submicron shafts
Characteristics
　Outer diameter tolerance is controlled within 0.5 μ. 
Applications
　Motor shafts for DVDs and HDDs, shafts for Blu-ray disc drives, shafts for polygon mirrors, fuel injection shafts, and
　optical ferrule shafts
Materials
　Stainless steel
Axis diameter
　φ1.5–φ6mm

Microshafts
Characteristics
　We have achieved high precision and weight reduction. 
Applications
　Vibration motor shafts for mobile phones, medical, semiconductor, and super small motor shafts, 
　connector pins for communication, and zoom guide shafts (including lubrication plating).
Materials
　Stainless steel • POM
Axis diameter
　φ0.4–φ1.0 mm

Super surface finish shaft
Characteristics
　We have achieved control with submicron precision.
Applications
　Liquid bearing shafts (video cameras and motors for laser printer fans). 
Materials
　Stainless steel
Axis diameter
　φ1.2–φ3.0 mm

Subassembly
Characteristics
　We can reduce form costs by press-fitting products with BSBM materials. 
Materials
　Stainless steel, BSBM, sintering parts, POM, rubber, press, and assemblies such as springs. 
Axis diameter
　φ1.2–φ3.0 mm

For general purposes
Applications
　Shafts for car parts, acoustic shafts, shafts for office equipment, special drills, medical shafts, 
　shafts for construction equipment, and lead screws.
Materials
　Stainless steel • POM (Duracon)
Axis diameter
　φ0.8–φ30 mm

Material

We offer support for both common and special materials. 

Carbon steel for mechanical structures
S–C Material ※Mainly, S45C is common. 
Alloy steel
SCM
Carbon tool steel
SK
SKS
SKD
High-speed tooled steel
SKH51–57
Stainless steel
Martensite series: SUS420J2, SUS420F2, SUS420F, and SUS416 
Austenite series: SUS303, SUS304, and SUS316 
Ferrite series: SUS430 
Spring steel
SW
Bearing steel
SUJ1
SUJ2
Tungsten

We also offer other special materials and high hardness/nonmagnetc materials. 

This company is recommended by the following support organizations.

御殿場市商工会