Corporate Overview
| Name | Gunma Seiko Co., Ltd. |
|---|---|
| Established | July 8, 1968 |
| Paid-in capital | ¥10 million |
| Representative | President Yoichi Marumo |
| Business addresses |
Kamikawa Factory1295-13 Motoabo, Kamikawa-machi,Kodama-gun, Saitama-ken, Japan 367-0247 [ map ] TEL.0495-74-0888 (Reception) FAX.0495-74-0987 
Fujioka Nishi Factory1065-1 Naka-Otsuka Aza Takimae, Fujioka-shi,Gunma-ken, Japan 375-0053 [ map ] TEL.0274-22-7003 (Reception) FAX.0274-22-7590 
Die Technical285-8 Motohara,Kamikawa-machi,Kodama-gun,Saitamaken,Japan367-0241 FAX.0495-71-5561 
GUNMA SEIKO (THAILAND) CO.,LTD.Pinthong Industrial Estate 3219/10 Moo 6, TambonBowin, Amphur Sriracha, Chomburi 20230 [ map ] TEL.+66(0)33-005-866～8 FAX.+66(0)33-005-869 |
| Businesses | Manufacture and supply of high-precision cold forged parts for transportation equipment, office automation equipment, and leisure-related products. |
| Production ratio by material | Aluminum: Approx. 54%, Steel: Approx. 45%, Copper: Approx. 1% |
| Trade bank | Gunma Bank Shin-machi Branch Saitama Resona Bank Honjo Branch Japan Finance Corporation Maebashi Branch Mizuho Bank Takasaki Branch Shoko chukin Bank Maebashi Branch |
| Main customers |
Hitachi Astemo BOSCH GLOBERIDE MAX KYB YANMAR CKD Knorr-Bremse NSK Steering Systems SANDEN SANWA SEIKI SANYO KOGYO TOYOTA Harmonic Drive Systems (In no particular order) |
Corporate History
| 1968 | Gunma Seiko Co., Ltd. established with \2 million in paid-in capital. |
|---|---|
| 1970 | Aluminum cold forging begun for motorcycle parts. |
| 1972 | Aluminum cold forging developed for fishing tackle spools. |
| 1973 | Paid-in capital increased to \8 million. |
| 1975 | Patented obtained for water pipe welding saddle production method. |
| 1976 | Developed a rod cover single-unit cylinder. |
| 1978 | Finished construction of the Isesaki Factory. |
| 1982（S57） |
 Awarded the 1st Technology Development Prize |
| 1985 | Developed and applied photosensitive drum (EI tube) production technology. |
| 1991 |
 Awarded the 1st Aluminum Forging Technology Prize Awarded the 1st Aluminum Forging Technology Prize from Japan Aluminum Association. |
| 1992 | First phase of the Fujioka Nishi Factory completed. |
| 1993 | Second phase of the Fujioka Factory completed. C.I. installed. |
| 1995 | Paid-in capital increased to \10 million. |
| 1996s | Isesaki Factory combined with the Fujioka Factory. |
| 1997 | PRONES production control software installed. |
| 2000 | Design of a 630-ton forge press installed. |
| 2002 | Establishment of in-company LAN system. |
| 2003 | Establishment of integrated production system by introduce of T-6 processing equipment. |
| 2004 | ISO9001(2000) is acquired. |
| 2007 | Relocation of Fujioka Factory to the Kamikawa Factory (Kamikawa town,Saitama Prefecture) completed. |
| 2008 | Establish of Forging Simulation DEFORM |
| 2009 | ISO14001(2004) acquired |
| 2011 | Technology Support Contract with NEW SWAN Company India Establishment of GUNMA SEIKO(THAILAND) in Thailand |
| 2018 | Establishment of cold forging technology for stainless materials 50th Anniversary Memorial Ceremony Observed |
Main Facilities
| Process | Equipment name | Capacity | Unit | Made by |
|---|---|---|---|---|
| Cutting | High-speed metal saw for Fe | ～Ø50 | 1 | Tsune Seiki |
| High-speed metal saw for Al | ～Ø90 | 2 | Tsune Seiki | |
| Al annealing | Pit type flow annealing furnace | 500kg | 2 | Oriental Engineering & Others |
| Fe annealing | Vacuum heat annealing furnace | 1.5 Ton | 1 | Nakanihon Furnace Industry |
| Speria pit type bright annealing furnace | 1.5 Ton | 1 | Oriental Engineering | |
| Atmospheric Furnace | 1.5 Ton | 1 | Oriental Engineering | |
| Shot blasting | TFー77LA | 300kg | 1 | Nitchū |
| Lubrication | Automatic lubrication for Al | 5 Ton/day | 2 | In-house built |
| Automatic lubrication for Fe | 15 Ton/day | 1 | In-house built | |
| WLS Liquid lubrication applicator | 1 | Makō | ||
| Forging | Cold Forging Presses | 630t | 2 | KOMATSU |
| 630t | 1 | SANES | ||
| 400t | 3 | KOMATSU | ||
| 400t | 1 | AIDA | ||
| 300t | 1 | KOMATSU | ||
| 250t | 2 | KOMATSU | ||
| 250t | 1 | AIDA | ||
| 160t | 1 | KOMATSU | ||
| Sheet metal servo press | 200t | 1 | AMADA | |
| Sheet metal press | 110t | 1 | KOMATSU | |
| 45t | 1 | KOMATSU | ||
| Hydraulic presses | 800T | 1 | KAWAMURA | |
| 40t | 2 | SANKEI | ||
| 30t | 1 | TOKAI KIKI | ||
| 30tL | 1 | SANKEI | ||
| 20t | 1 | SANKEI | ||
| Machining | 5-axis multifuntional machine | 1 | Nakamura-tome | |
| CNC lathe | 22 | Okuma & others | ||
| CNC lathe with loader | 27 | Takamatsu & others | ||
| 2 spindle CNC lathe | 7 | Murata | ||
| Tapping center | 12 | FANUC & others | ||
| Rolling machine | 1 | Nissē | ||
| Centerless grinder | 1 | Omiya | ||
| Die processing | General purpose lathe | 3 | Howa Industry, Okuma | |
| Milling machine | 1 | Kanto Machinery | ||
| Surface grinder | 1 | Kuroda Seiko | ||
| Electric discharege machine | 2 | Sodick | ||
| NC lathe | 2 | Okuma | ||
| Cutting machine | 1 | Tsune Seiki | ||
| Heating furnace | 1 | Thermal | ||
| Machining center | 2 | Okuma, Mori Seiki | ||
| SMAP | 1 | Toyo Industry |