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Sigma Ltd.


Toshitaka SHITANAKA (Mr.)
Year established
45,000,000 yen
4,250,000,000yen(as of April,2013)
Postal (zip) code
Company address
9-2-28 Kegoya, Kure-shi, Hiroshima-ken
Company PR
With a variety of forming technologies centered around cold forging, Sigma combines multiple forging techniques to offer optimum design and high-efficiency production. Sigma responds to customers' needs in all areas of forming, cutting/grinding and electric/electronic technology.
Major Products
Automobile AT/MT precision components
Inflator components
Resin cases and connectors
Security products (security cameras, shoplifter prevention system)
Laser Inspection System
Major Customers
Mazda Motor Corp.
Microtechno, Co., Ltd.
Asmo Co., Ltd
Daicel Chemical Industries, Ltd.
Major Facilities/Equipment
Cold header 17
 Parts former, 4D4B, 2D3B, 2D2B, 1D2B
Press 21
 3 t, 5 t, 10 t, 60 t, 250 t, 630 t
Form rolling machine 25
 Roll Plastic Process Machinery, circular rollings
Injection molding machine 12
 Horizontal type: 280 t, 180 t, 150 t, 110 t, 75 t, 60 t, Vertical type: 70 t, 30 t
NC lathe 58
 Chuck type NC
Technology Employed
Transportation machinery/equipment manufacturing industry
Has eliminated grinding by achieving header die spindle precision of 20 micron meter.
Transportation machinery/equipment manufacturing industry
Performs chipless processing through roll forming.
Transportation machinery/equipment manufacturing industry
Provides services covering the design, manufacture, and product design of molds. Also handles precision forming of heat plasticizing resins.
Transportation machinery/equipment manufacturing industry
Forms various types of gears via the cold forging press.
Primary Area of Technical Expertise

Precision cutting/grinding technology combined with various forming technologies centered around precision cold forging, roll forming and injection molding of small parts, allow Sigma to develop functional products on the basis of its technological capabilities.

Future Business Challenges
Development of functional products through the combination of various types of forming technologies
Future Technical Challenges
Transportation machinery/equipment manufacturing industry
Manufacturing of low-cost parts, establishing a line to produce cold forging and rolling products simultaneously.
Transportation machinery/equipment manufacturing industry
Pursuit of single micron level precision through super header technology.

Patent applications: Approximately 80 (55 of these are products developed independently by our company.)
Technologies and items currently being developed based on these patent applications:
(1) Flaw detection equipment using laser light
(2) Molding technology for electromagnetic radiation protection and electric plastic
(3) Molding technology for environmentally-friendly biodegradable plastic
(4) Molding technology for hybrid phenol plastic

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