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ミヤマ精工

addressAichi/Chiryu-shi/16-1 Kaneyama, Aizuwakamatsu City
phone0566-83-0232
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last updated:Jun 12, 2025
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Precision cold forging Precision cold forging
Squeezing processing Squeezing processing
Layered processing Layered processing
Rough machining Rough machining
Applied technology Applied technology
Precision

Precision cold forging

This is a processing method that involves applying force to metal at room temperature to deform it and create various shapes. Forging includes "hot forging" and "warm forging," where the metal material is heated before applying force, and "cold forging," where force is applied at room temperature. Hot forging results in significant dimensional changes and a rough surface, necessitating surface treatment in subsequent processes. In contrast, cold forging achieves precise shapes and has the advantage of not requiring surface finishing. Particularly when compared to cutting processes, cold forging deforms the material using molds, which eliminates cutting scrap and is expected to reduce costs and environmental impact, making it the greatest benefit. On the other hand, depending on the structure and shape of the mold, controlling excess material and deficiencies can be challenging. Our company specializes in obtaining long, thin hole shapes. (We can achieve inner diameters of around 20 mm and lengths of approximately 55 mm.) We also accommodate special materials that require hardness and are difficult to process, such as stainless steel, ferritic, and martensitic materials. Additionally, we handle aluminum materials used in fuel pumps and other applications.

Precision cold forging processing

There are no particular restrictions as long as plastic processing is possible at room temperature, not limited to iron, but there are some limitations depending on the degree of processing.

Automotive fuel injection-related parts and other automotive-related parts.

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What is precision cold forging used in products like fuel injectors?

It achieves precise shapes and has the advantage of not requiring surface finishing!

Precision cold forging is a processing method that applies force to metal at room temperature to deform it and create various shapes. Hot forging results in significant dimensional changes and a rough surface, necessitating surface finishing in subsequent processes. In contrast, cold forging achieves precise shapes and has the advantage of not requiring surface finishing. Our company specializes in shapes with long, narrow holes and can handle special materials that require high hardness and are difficult to process, such as stainless steel, ferritic, and martensitic materials. 【Features of Precision Cold Forging】 ■ A processing method that applies force to metal at room temperature to deform it and create various shapes ■ Achieves precise shapes without the need for surface finishing ■ Does not produce cutting scrap, leading to cost reduction and reduced environmental impact *For more details, please refer to the related links or feel free to contact us.

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Precision cold forging [Deburring of holes in fuel injector components]

We manufacture precision products that keep the wobble rate to 5/100 and the coaxiality to 0.05 millimeters or less!

We would like to introduce a development case of burr-free processing of fuel injector parts using precision cold forging. The aim of the development is to achieve penetration of fine deep holes through diameter reduction extrusion, eliminate cutting for the inner diameter of fine deep holes, and abolish punching in the middle section of fine deep holes. Additionally, our company specializes in creating long, thin hole shapes and can handle special materials that require hardness and are difficult to process, such as stainless steel, ferritic, and martensitic materials. [Development Aims] - New Method: Penetration of fine deep holes through diameter reduction extrusion - Improved Accuracy and Cleanliness: Elimination of cutting for the inner diameter of fine deep holes - Novelty: Abolition of punching in the middle section of fine deep holes *For more details, please refer to the related links or feel free to contact us.

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Precision Cold Forging [Cold Forging of Difficult-to-Process Material SUS440C]

Cold forging of martensitic stainless steel! A case that contributed to winning a technology development award.

We would like to introduce a development case of cold forging of the difficult-to-process material SUS440C using precision cold forging. Even if there were ideas for performance improvement in customer products, it was difficult to realize them due to the complex shapes and challenges in machining. We developed products with hole diameter tolerance of ±0.015, coaxiality of Φ0.02, and roundness of 0.01 to 0.015, contributing to our customer's T company receiving a technology development award. [Development Objectives] ■ New Method: Cold forging of axially asymmetric complex shapes ■ Improvement in New Product Performance: World-class No. 1 performance for fuel injection systems ■ Novelty: Cold forging of martensitic stainless steel *For more details, please refer to the related links or feel free to contact us.

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Precision Cold Forging [Cold Forging of Fuel Injector Parts (Complex Shapes)]

Yield 79%! We have achieved a strict precision with a sliding rate of 5/100.

We would like to introduce a development case of cold forging of fuel injector parts using precision cold forging (complex-shaped products). The aim of the development is the application of a through-hole method for small-diameter deep holes, reduction of cutting sections through the penetration of small-diameter deep holes, and cold forging of cylindrical products with hollow shafts. Additionally, our company specializes in creating shapes with long, thin holes and can handle special materials that require hardness and are difficult to process, including stainless steel, ferritic, and martensitic materials. [Development Objectives] - New Method: Application of the through-hole method for small-diameter deep holes - Yield Improvement: Reduction of cutting sections through the penetration of small-diameter deep holes - Novelty: Cold forging of cylindrical products with hollow shafts *For more details, please refer to the related links or feel free to contact us.

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Mold manufacturing, progressive stamping, cold forging [Many achievements in automotive parts]

Leave precision press deep-drawn products and precision cold-forged products to us!

Miyama Seiko Co., Ltd. conducts process design, mold design, manufacturing, prototyping, and mass production of metal parts for automobiles in a consistent system. We produce and develop transfer press processed products, precision progressive presses, precision cold forging, and secondary processed products, starting with mold manufacturing equipment (design and assembly are done in-house). In addition to our headquarters factory and Toyota factory, we also have a base in Thailand. Please feel free to contact us when you need our services. 【Business Contents】 ■ Process design, mold design and manufacturing ■ Consistent system for prototyping and mass production *For more details, please download the PDF or feel free to contact us.

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High-precision pressing and drawing processing, etc. [Technical Explanation Document]

Based on in-house production, creating molds without incurring unnecessary costs while ensuring quality!

In this document, we introduce Miyama Seiko Co., Ltd.'s "Press Technology." We cover the use of simulation software, efforts in automation, IoT, and digitalization, as well as information on our in-house automatic equipment and various technical details. Our company is capable of providing comprehensive support from process design, mold design, mold manufacturing, prototyping, to mass production. Utilizing the know-how we have cultivated over many years, we deliver products with reliable and stable quality. [Contents (partial)] ■ Mold manufacturing ■ Proposal capabilities, design capabilities, know-how ■ Use of simulation software ■ Efforts in automation, IoT, and digitalization ■ Equipment introduction of in-house automatic devices *For more details, please download the PDF or feel free to contact us.

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Mold making, progressive pressing, cold forging. Which method is optimal, pressing or forging?

We will suggest appropriate processing methods such as progressive stamping or cold forging according to product specifications! What are Miyama Seiko's precision press deep-drawn products and precision cold forging services?

Miyama Seiko Co., Ltd. conducts process design, mold design, manufacturing, prototyping, and mass production of metal parts for automobiles in an integrated system. We produce and develop secondary processed products such as mold manufacturing equipment (design and assembly are done in-house), transfer press processed products, precision progressive press, and precision cold forging and machining. We possess multiple processing methods, including precision progressive pressing and cold forging, allowing us to select the optimal method according to product shape and production volume! We also support efficient and high-quality product development from the design stage. In our catalog download, we are offering technical materials related to "press technology"! [Excerpt of contents] - A processing method for forming a thin metal plate into a tubular shape → Parts used in automotive injectors, fuel pumps, exhaust gas recirculation devices, throttles, etc. - Achieving high precision with an inner diameter tolerance of 2/100 to 5/100 millimeters - Technical information on laminated processed products - Sheet forging technology related to lithium-ion battery parts and transmission parts *For more details, please download the PDF or feel free to contact us.

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[Data] Press Technology December Issue

We would like to introduce an article featuring the trusted technology of Miyama Seiko Co., Ltd.!

The document is a booklet titled "Press Technology December Issue," featuring a special article about Miyama Seiko Co., Ltd. It introduces our core technology of deep drawing, a major overhaul after 45 years, and a three-month secondment to AIDA's factory. In addition to our three domestic factories, our press line at the Thailand factory has also started full-scale operations. The globalization of our production system is progressing. [Contents (partial)] ■ Core technology is deep drawing ■ Major overhaul after 45 years ■ Achievements in laminated processing and differential pressure processing ■ Three-month secondment to AIDA's factory ■ Full-scale press processing in Thailand *For more details, please download the PDF or feel free to contact us.

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Development of a new joining method: Dissimilar metal joining through plastic processing.

Contributes to the reduction of CO2 emissions! Since they are processed individually, combinations of different shapes for upper and lower workpieces are possible.

We have developed a new joining method for dissimilar metal bonding using plastic processing. The joining with the new method reduces costs. It contributes to the reduction of CO2 emissions through scrap recycling. Since processing is done individually, it allows for the combination of upper and lower workpieces of different shapes. Both sheet and rod materials can be joined. Please consult us regarding the feasibility of processing. [Objective] ■ Contributing to cost reduction and CO2 emission reduction through method transformation ■ Dissimilar metal bonding through cold forging *For more details, please download the PDF or feel free to contact us.

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Strengths of Cold Forging: Eco-friendly Processing with Near-Net Shape

By manufacturing forged workpieces in a shape close to the product shape, it is possible to reduce chip discharge and shorten processing time compared to full cutting.

We conducted eco-friendly processing with near-net shape technology. Here, we will introduce the strengths of cold forging processing. For all-cut products, the processing time is 207 seconds per piece, and bar materials generate additional scrap at both ends. Processing of non-simple cylindrical shapes takes more time, and often, internal irregular shapes in small diameter holes cannot be processed. In the case of cold forging plus cutting finish products, the processing time is a total of 136.32 seconds per piece. Since we cut from coils, the amount of scrap relative to the number of pieces is minimal, and irregular shapes can be processed efficiently due to mold transfer. (Especially for the inner diameter section) 【Objectives】 ■ By shaping the product close to its final form through cold forging, we reduce the discharge of scrap and chips (resource conservation). ■ Only the necessary parts are machined or finished to meet the required precision. ■ The crystal structure of the material becomes denser through forging, improving toughness. ■ Fiber flow (forging flow lines) occurs, enhancing strength. *For more details, please download the PDF or feel free to contact us.

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[Development Case] Pressing of Lithium-Ion Battery Cover Plates

Combination of cold forging and pressing technology! Integrated molding of safety valves and cover plates through pressing processing.

We would like to introduce a development case of the press processing of lithium-ion battery cover plates. In conventional products, safety valves were laser-welded to the cover plate body. The developed product implements the integrated molding of the safety valve and cover plate through press processing. Additionally, the cost of the developed product is 60 compared to 100 for the conventional product. Please feel free to contact us when you need assistance. 【Development Objectives】 ■ New Method: Combination of cold forging and press technology ■ Cost Reduction: Shortening of processes through a review of processing methods ■ Novelty: Integrated processing *For more details, please download the PDF or feel free to contact us.

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[Development Case] Cold Forging Inner Diameter Net Shaping

Achieving improved material yield through the elimination of cutting in inner diameter by increasing forging precision!

We would like to introduce a case study on the development of cold forging for inner diameter net shape. In conventional products, we relied on cutting processes, but the developed product implements cold forging plus cutting (for the outer diameter). The material yield improved from 26% for conventional products to 80% for the developed product. Please feel free to contact us when you need our services. 【Development Objectives】 ■ New Method: Cold forging for the cutting process ■ Improved Material Yield: Elimination of cutting for inner diameters due to enhanced forging precision ■ Novelty: Ultra-precise cold forging (industry-leading level) *For more details, please download the PDF or feel free to contact us.

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[Development Case] Cold Forging Near-Net Shape Formation

A new method for penetrating small-diameter deep holes! Achieving no cutting for the inner diameter in small-diameter deep hole penetration.

We would like to introduce a case study on the development of cold forging net shape manufacturing. In conventional products, machining was used, but the developed product utilizes a combination of cold forging and machining, resulting in a material yield of 80% compared to 14% for conventional products. Additionally, it achieves an industry-leading L/D ratio of approximately 7 times. Please feel free to contact us when you need assistance. [Development Objectives] ■ New Method: Through-hole for small diameter deep holes ■ Improved Material Yield: No machining for inner diameter through-holes ■ Novelty: L/D ratio of approximately 7 times (industry-leading level) *For more details, please download the PDF or feel free to contact us.

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[Development Case] Near-Net Shape Manufacturing of Injector Components

Improved yield through non-cutting of outer diameter by increasing forging accuracy! A case study of flange forming without intermediate annealing.

We would like to introduce a development case of near-net-shape manufacturing for injector components. In conventional products, processes such as cleaning, annealing, shot blasting, and oiling were performed in intermediate processing. The developed product implements flange forming without intermediate annealing, eliminating the intermediate processing. The cost of the developed product is 80% compared to 100% for the conventional product. Please feel free to contact us when you need our services. 【Development Objectives】 ■ New Method: Through-hole for small diameter deep holes (without annealing) ■ Improved Yield: Elimination of external diameter cutting due to increased forging precision ■ Novelty: Flange forming without intermediate annealing *For more details, please download the PDF or feel free to contact us.

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[Development Case] Deburring of Holes in Injector Parts

Through-hole of small diameter deep hole by diameter reduction extrusion! Abolition of punching in the middle section of small diameter deep holes.

We would like to introduce a development case for deburring the inner holes of injector components. We adopted a new method for penetrating small-diameter deep holes using diameter-reducing extrusion, achieving non-cutting of the inner diameter through small-diameter deep hole penetration, which improved precision and cleanliness. Additionally, we eliminated punching in the intermediate section of the small-diameter deep hole. The coaxiality improved from φ0.15 to φ0.05. 【Development Objectives】 ■ New Method: Penetration of small-diameter deep holes using diameter-reducing extrusion ■ Improved Precision and Cleanliness: Non-cutting of the inner diameter through small-diameter deep hole penetration ■ Novelty: Elimination of punching in the intermediate section of small-diameter deep holes *For more details, please download the PDF or feel free to contact us.

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[Development Case] Cold Forging of Difficult-to-Process Materials

Cold forging of austentic stainless steel! A case study of a new method for finishing inner and outer diameters through cold forging.

We would like to introduce a case study on the development of cold forging for difficult-to-process materials. In conventional products, machining was performed from bar or pipe materials. The developed product underwent cold forging in three processes plus grinding of both end faces. The cost of the conventional product is set at 100%, while the developed product is at 80%. Please feel free to contact us when you need our services. 【Development Objectives】 ■ New Method: Inner and Outer Diameter Cold Forging Finish ■ Improved Yield: Elimination of Machining for Inner and Outer Diameters (Grinding of Both End Faces) ■ Novelty: Cold Forging of Austenitic Stainless Steel *For more details, please download the PDF or feel free to contact us.

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[Development Case] Cold Forging of Difficult-to-Process Material SUS440C

A new method for cold forging of axisymmetric complex shapes! Cold forging of martensitic stainless steel.

We would like to introduce a case study on the development of cold forging for difficult-to-process material SUS440C. In the past, even if there were ideas for performance improvement in customer products, it was impossible to realize them due to the complex shapes that made machining difficult. (It was a different shaped product.) The developed product underwent cold forging and machining, resulting in improved product performance. Please feel free to contact us when you need assistance. 【Development Objectives】 ■ New Method: Cold forging of non-axisymmetric complex shapes ■ Product Performance Improvement: World-class performance of fuel injection systems ■ Novelty: Cold forging of martensitic stainless steel *For more details, please download the PDF or feel free to contact us.

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[Development Case] Cold Forging of Fuel Injector Parts (Complex Shaped Products)

Application of penetration methods for small-diameter deep holes! Case study of cold forging of hollow shaft cylindrical products.

We would like to introduce a development case of cold forging of fuel injector parts (complex-shaped products). For general products, cold forging + welding + machining is performed, resulting in a yield of 55%. In the developed product, we implemented a reduction of the machined section by using a through-hole method for small-diameter deep holes, achieving a yield of 79%. 【Development Objectives】 ■ New Method: Application of the through-hole method for small-diameter deep holes ■ Yield Improvement: Reduction of the machined section through the use of small-diameter deep holes ■ Novelty: Cold forging of hollow cylindrical products *For more details, please download the PDF or feel free to contact us.

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Mold making, progressive stamping, cold forging. Which method is optimal, stamping or forging?

We propose appropriate processing methods such as progressive stamping or cold forging according to product specifications! We also introduce joining of different metals through plastic processing! 【Exhibiting at ●● Exhibition】

Miyama Seiko Co., Ltd. conducts process design, mold design, manufacturing, prototyping, and mass production of metal parts for automobiles in an integrated system. We produce and develop secondary processed products such as mold manufacturing equipment (design and assembly done in-house), transfer press processed products, precision progressive presses, and precision cold forging and machining. We possess multiple processing methods, including precision progressive pressing and cold forging, allowing us to select the appropriate method based on product shape and production volume! We also support efficient and high-quality product development from the design stage. In our catalog download, we are offering technical materials related to "press technology" and "dissimilar metal joining through plastic processing"! [Excerpt from the content] ■ A processing method that forms a thin metal plate into a tubular shape → Parts used in automotive injectors, fuel pumps, exhaust gas recirculation systems, throttles, etc. ■ Achieving high precision with an inner diameter tolerance of 0.02 to 0.05 millimeters ■ Technical information on laminated processed products ■ Sheet forging technology related to lithium-ion battery parts and transmission parts *For more details, please download the PDF or feel free to contact us.

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