Language: 日本語 | English
Language: 日本語 | English
Forging is a process that makes three-dimentional objects out of materials by crushing, exciting and other deforming procedures.
Various shapes are possible. Consult with us.
We also accept press stamping with dies produced by other companies. Put our ability to maintain dies and our quality assurance to good use. We have presses between 20 and 150 tons and can handle die sizes of up to 900 mm, plate thickness of 2 mm and materials width of 200. Materials include SPCC and SUS springs.
Material: Phosphor Bronze C5210R-1/2H, t0.15mm
Outer Diameter: φ2.3mm
Circularity: 0.03mm
At the customer's request, we designed a shape that secures the part inside the hole of the mating component.
For more examples of leaf spring products, click here:
https://www.kyowa-hearts.com/spling/
☆ Frequently Asked Questions
https://www.kyowa-hearts.com/faq/
☆ Equipment Information
https://www.kyowa-hearts.com/setsubi/
☆ Contact & Process from Prototyping to Mass Production
https://www.kyowa-hearts.com/flow/
＜Contact Information＞
Kyowa Hearts Co., Ltd. – Rumi Sakamoto
■ Address: 1-5-1 Takata-Nishi, Kohoku-ku, Yokohama, Kanagawa, Japan
■ TEL: 045-593-6116 FAX: 045-593-6121
■ Official Website: https://www.kyowa-hearts.com
Introducing Load Testing / Load Measurement Services for Leaf Springs
At Kyowa Hearts, we specialize in the processing of leaf springs.
There are several key points in quality control for leaf springs, but load is one of the most critical factors.
To achieve sufficient load capacity, fine adjustments to the product shape and careful selection of materials are essential.
We have multiple load measurement machines in-house, allowing us to collect data during the prototyping stage to assist in selecting the optimal material and sheet thickness.
Additionally, during mass production, we can measure the load of leaf springs in real time and make fine adjustments to ensure product quality.
Even if you don’t have design drawings, no problem! Reverse engineering is also available.
Feel free to contact us anytime!
☆ Frequently Asked Questions:
https://www.kyowa-hearts.com/faq/
☆Equipment Information:
https://www.kyowa-hearts.com/setsubi/
☆From Inquiry to Prototyping & Mass Production:
https://www.kyowa-hearts.com/flow/
Contact Information
Kyowa Hearts Co., Ltd. – Rumi Sakamoto
Address: 1-5-1 Takata Nishi, Kohoku-ku, Yokohama, Kanagawa, Japan
TEL: 045-593-6116
FAX: 045-593-6121
Official Website: https://www.kyowa-hearts.com
This is an ultra-deep drawing process for nickel silver.
Dimensions: φ8mm, length 140mm, thickness 0.5mm.
We also have experience processing brass, aluminum, and stainless steel.
A 30-ton transfer press used for multi-stage deep drawing of stainless steel.
We use SUS444 sheet material.
From a plate thickness of 0.8mm, we iron the wall thickness down to 0.4mm (top surface retains original thickness).
This processing technology is essential to ensure wall thickness uniformity, roundness, and coaxiality.
By employing this method, increased material hardness is achieved, making it widely used in products requiring enhanced airtightness and durability strength.
【Product Details】
Material: SUS444
Plate Thickness: 0.8mm
Industry: Industrial Pneumatic Equipment
Processing Method: Progressive Press
Contact Information
Nissin Precision Machines Co., Ltd. – Head Office
〒146-0095, 2-29-21 Tamagawa, Ota-ku, Tokyo 146-0095, Japan
📞 Tel: +81-3-3758-1901
📧 E-mail: gn_info@nissin-precision.com
Contact Person: F.N
We are pleased to introduce our 5-axis controlled vertical machining center.
Nissin Precision utilizes the D200Z 5-axis machining center manufactured by Makino Milling Machine Co., Ltd.
This advanced system enables:
- Machining of cemented carbide materials
- Complex die components through simultaneous 5-axis machining
- Production of highly intricate geometries that are difficult or impossible with conventional 3-axis systems
Despite its compact footprint, the D200Z excels in:
- Small workpieces
- Slender and precision components
- High-accuracy fine-feature machining
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Production Examples
(See separate page for detailed case studies)
Lower cutting dies
Achievable tolerance: ±0.005 to ±0.01 mm
If you are facing challenges related to 5-axis machining, please feel free to contact us. We are ready to support your precision manufacturing requirements.
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❀Contact Information❀
Nissin Precision Machines Co., Ltd. – Head Office
〒146-0095, 2-29-21 Tamagawa, Ota-ku, Tokyo 146-0095, Japan
TEL: +81-3-3758-1901
E-mail: gn.info@nissin-precision.com
Website: https://www.nissin-precision.com/products/precisiondie/
Contact Person: M.H.
We are pleased to introduce our Vertical Machining Center.
At Nissin Precision, we operate the vertical machining center “V56i” manufactured by Makino Milling Machine Co., Ltd.
The V56i is capable of machining hardened materials. By selecting tools appropriate to the material, virtually any workpiece material can be processed. The machine maintains stable accuracy even during long continuous machining operations.
It also enables complete finishing of aluminum die sets. Thanks to its high precision, circular hole machining previously performed on wire EDM machines can now be processed efficiently on the V56i.
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Production Examples (See detailed information on a separate page)
Outer Die Components
Achievable Tolerance: ±0.005 to ±0.01 mm
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If you have any challenges related to vertical machining center processing, please feel free to contact us.
❀Contact Information❀
Nissin Precision Machines Co., Ltd. – Head Office
〒146-0095, 2-29-21 Tamagawa, Ota-ku, Tokyo 146-0095, Japan
TEL: +81-3-3758-1901
E-mail: gn.info@nissin-precision.com
Website: https://www.nissin-precision.com/products/precisiondie/
Contact Person: M.H
This time, we are pleased to introduce our vertical machining center.
At our company, we use the “V33i” vertical machining center manufactured by Makino Milling Machine Co., Ltd..
Compared to the V56i, the V33i features a different stroke range and excels in high-speed machining, maintaining stable accuracy even during long-hour operations. In comparison with the V56i, it is mainly suited for small to medium-sized workpieces.
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Production Example (see details on a separate page!)
・Rough machining of flange
・Material: SKD11
・Rough machining is performed from cylindrical stock, taking approximately 5 hours.
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If you have any concerns regarding vertical machining center processing, please feel free to contact us!
❀ Contact Information ❀
Nissin Precision Co., Ltd. Head Office
2-29-21 Tamagawa, Ota-ku, Tokyo 146-0095
TEL: 03-3758-1901
E-mail: gn.info@nissin-precision.com
Related URL: https://www.nissin-precision.com/products/precisiondie/
Person in charge: M.H
This time, we are pleased to introduce our wire electrical discharge machine (Wire EDM).
At our company, we use the “MP2400 Series” wire EDM manufactured by Mitsubishi Electric.
It allows multiple workpieces to be set at once for long continuous machining, enabling non-stop operation overnight and on weekends.
Fine wire machining is also supported, using wire diameters from φ0.05 to φ0.2 mm. We have a proven track record of machining complex geometries with very tight tolerances, such as ±0.002 mm. In principle, any electrically conductive material can be processed.
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Production Example (see details on a separate page!)
・DIE
・Material: WC VF12
・Tolerance: ±0.003
・Wire diameter used: φ0.07
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We have three wire EDM machines in operation, striving to achieve high precision and stable quality.
If you have any challenges related to wire EDM machining, please feel free to contact us!
❀ Contact Information ❀
Nissin Precision Machines Co., Ltd. Head Office
〒146-0095, 2-29-21 Tamagawa, Ota-ku, Tokyo, Japan
TEL: 03-3758-1901
E-mail: gn.info@nissin-precision.com
Related URL: https://www.nissin-precision.com/products/precisiondie/
Person in charge: M.H
This time, we are pleased to introduce our high-precision CNC coordinate measuring machine (CMM).
At our company, we use the “STRATO-APEX” manufactured by Mitsutoyo Corporation to measure die components.
While this measuring system represents a significant investment, it delivers measurement accuracy that truly justifies its value. For a company like ours that handles precision die components, it is an indispensable piece of equipment.
This CMM is equipped with several measurement software programs.
One of the programs we frequently use is “CAT1000S,” which includes advanced free-form surface measurement functions. By importing 3D CAD data, the software compares measured points with design data and automatically calculates alignment to minimize deviation, enabling highly accurate and efficient measurements.
Currently, our younger engineers are actively utilizing this function to measure components with a wide variety of complex geometries.
A more detailed explanation of our measurement methods will be provided on a separate page.
❀ Contact Information ❀
Nissin Precision Machines Co., Ltd. Head Office
〒146-0095, 2-29-21 Tamagawa, Ota-ku, Tokyo, Japan
TEL: 03-3758-1901
E-mail: gn.info@nissin-precision.com
Related URL: https://www.nissin-precision.com/products/precisiondie/
Person in charge: M.H
Today, we are pleased to introduce our original in-house product: the “Sine Bar Chuck”, a tilting electromagnetic chuck designed for grinding applications.
At Nissin Precision, we develop functional expansion tools that we ourselves find useful in die manufacturing and supply them to industry professionals.
Below are the key features we would like to highlight:
1. Easy, Fast, and Accurate Angle Setting
⇒ A sine bar is built into the shaft, allowing any desired angle to be quickly and precisely set using gauge blocks.
2. One-Touch Locking Mechanism
To address the common drawback of conventional tilting chucks—dimensional deviation caused during shaft tightening—we developed an indirect clamping mechanism.
This innovation ensures high accuracy with a simple lever operation and allows locking in just a few seconds.
3. High-Precision Shaft and Bearings
⇒ The accuracy during locking is ensured by the “high-precision shaft and bearings.” The shaft is made of special steel, and the bearing incorporates over a hundred steel balls, designed to eliminate play and maintain stable precision.
Product Lineup
Air-cooled type: HSG-315 / 270
Water-cooled type: HSGC-315 / 270
Electrode pitch options are available in both standard and micro-pitch types.
For detailed specifications, please visit our website:
https://www.nissinprecision.com/products/original/sinebarchuck/
We also use the Sine Bar Chuck in our own grinding operations.
If you have any inquiries, please feel free to contact us.
❀ Contact Information ❀
Nissin Precision Machines Co., Ltd. – Head Office
〒146-0095, 2-29-21 Tamagawa, Ota-ku, Tokyo, Japan
TEL: +81-3-3758-1901
E-mail: gn.info@nissin-precision.com
Website: https://www.nissin-precision.com/products/precisiondie/
Contact Person: M.H
We process SUS (stainless steel), SPC steel, and SEC steel materials.
The curling process is performed using a progressive die system, enabling stable forming and efficient mass production. We propose manufacturing methods designed with material yield optimization in mind, helping to reduce scrap while maintaining product strength and dimensional accuracy.
【Product Specifications】
Material: SUS, SPC, SEC
Thickness: 1.0 mm
Industry: Automotive
Processing Method: Progressive press die
Contact Information
Nissin Precision Machines Co., Ltd. – Head Office
〒146-0095, 2-29-21 Tamagawa, Ota-ku, Tokyo 146-0095, Japan
TEL: +81-3-3758-1901
E-mail: gn_info@nissin-precision.com
Contact Person: F.N
Today, we are pleased to introduce our in-house product: the rotary-type electromagnetic chuck, the “Rotary Chuck.”
This product, like the previously introduced Sine Bar Chuck, was developed for professionals engaged in die manufacturing, and is designed to significantly improve both work efficiency and machining accuracy.
By using the Rotary Chuck, rotational machining can be performed easily and with high precision. When used together with the Sine Bar Chuck, processes that were previously time-consuming can now be carried out more efficiently while maintaining high accuracy.
Thanks to its compact and lightweight design, setup changes and attachment/detachment are smooth. It reduces operator workload on-site while expanding machining capabilities.
When combined with the optional V-block, convex and concave machining of round components such as punches and dies (φ10–35mm) can be achieved with excellent workability.
In addition, the Rotary Chuck alone ensures high precision in the 1/1,000mm range (based on in-house measurements).
Furthermore, it adopts a waterproof protection structure rated IP63, making it suitable for both dry and wet machining environments, allowing safe and reliable operation in the field.
For more details, please visit our website:
https://www.nissinprecision.com/products/original/rotarychuck/
We also offer free rental of the Rotary Chuck. Please feel free to contact us.
❀ Contact Information ❀
Nissin Precision Machines Co., Ltd. Head Office
〒146-0095, 2-29-21 Tamagawa, Ota-ku, Tokyo, Japan
TEL: 03-3758-1901
E-mail: gn.info@nissin-precision.com
Related URL: https://www.nissin-precision.com/products/precisiondie/
Person in charge: M.H
Nissin Precision Machines Co., Ltd. provides integrated support from prototype processing of precision press parts to die manufacturing and full-scale mass production.
Below is an example of a punch used in dies for electronic components.
▪ Punch Specifications
- Machined Area: Cutting edge (straight square profile + corner radius R)
- Material: Cemented carbide
- Tolerance: ±0.001 mm
- Machining Equipment: Profile grinding machine
▸ About Profile Grinding
Profile grinding enables ultra-precise contour finishing of complex geometries, ensuring dimensional accuracy and edge sharpness essential for high-precision blanking applications.
▸ Digital Profile Grinding Machine DPG-150
Advanced digital profile grinding technology further enhances repeatability, measurement accuracy, and automated processing capability.
▪ Benefits of Ultra-High-Precision Finishing
- Extremely high reproducibility of press products
- Extended die service life
◎ About Nissin Precision Machines
Since its founding in 1957, Nissin Precision Machines Co., Ltd. has accumulated experience in the production of over 7,000 die sets.
The combination of proven expertise and advanced equipment may provide the solution to your precision die challenges.
Please feel free to contact us for consultation.
[Contact Information]
Nissin Precision Machines Co., Ltd. – Head Office
〒146-0095, 2-29-21 Tamagawa, Ota-ku, Tokyo 146-0095, Japan
TEL: +81-3-3758-1901
E-mail: gn.info@nissin-precision.com
Website: https://www.nissin-precision.com/products/precisiondie/
Nissin Precision Machines Co., Ltd. specializes in the manufacturing of precision dies, including deep-drawn motor case components and dies for semiconductor parts.
For punch profile machining—directly linked to final product accuracy—the company primarily employs high-precision profile grinding. Even extremely small or complex geometries are finished with exceptional accuracy, supporting stable and repeatable press processing through meticulous attention to detail.
▪ Punch Machining Examples / Capabilities
- Feature size below 1 mm → Tolerance: ±0.002 mm
- Straight + corner radius (R) geometry → Tolerance: ±0.001 mm
- In addition to dimensional accuracy, the exact center position of radius (R) features is precisely measured and machined.
➡ This comprehensive precision control aims to achieve near 100% reproducibility during press operations.
◎Integrated Manufacturing Support
Nissin Precision Machines Co., Ltd. provides end-to-end support—from die design and manufacturing to mass production through press processing.
With a cumulative track record exceeding 7,000 die sets, the fusion of accumulated expertise and advanced equipment may offer the solution to your precision and production challenges.
Please feel free to contact us for consultation.
[Contact Information]
Nissin Precision Machines Co., Ltd. – Head Office
〒146-0095, 2-29-21 Tamagawa, Ota-ku, Tokyo, Japan
TEL: +81-3-3758-1901
E-mail: gn.info@nissin-precision.com
Website: https://www.nissin-precision.com/products/precisiondie/
Nissin Precision Machines Co., Ltd. operates the robot-equipped digital profile grinding machine DPG-150, a system with extremely limited installations even within Japan.
This advanced equipment enables fully automated processing—from grinding wheel exchange and workpiece exchange to profile measurement and ultra-high-precision machining—without any manual intervention.
By leveraging this cutting-edge capability, Nissin Precision Machines continuously improves operational efficiency and optimizes manufacturing costs.
▪ Conventional Profile Grinding Machines
- Require individual profile charts (drawn contour lines) for each part
- High-precision machining depends heavily on skilled operators
- Repeated measurement and corrective grinding result in significant manual labor time
- Grinding wheel and workpiece changes require additional manual effort
➡ These factors limit productivity and restrict unattended or night-time operation.
▪ DPG-150 Digital Profile Grinding System
- Chartless operation with intuitive programming software
- Projection function enabling up to 400× magnification for accurate profile verification
- Automated measurement system
- Fully unmanned robotic exchange of grinding wheels and workpieces
➡ Enables night-time operation and dramatically improves production efficiency.
◎Comprehensive Die Manufacturing Capability
Nissin Precision Machines Co., Ltd. provides integrated support from die design and manufacturing through to mass production by press processing.
With a cumulative track record of over 7,000 die sets, the combination of proven expertise and advanced equipment may provide the optimal solution to your precision challenges.
Please feel free to contact us for further consultation.
[Contact Information]
Nissin Precision Machines Co., Ltd. – Head Office
〒2-29-21 Tamagawa, Ota-ku, Tokyo 146-0095, Japan
TEL: +81-3-3758-1901
E-mail: gn.info@nissin-precision.com
Website: https://www.nissin-precision.com/products/precisiondie/
Nippon Forming specializes in metal bending processing.
We perform high-precision processing for plate springs, wire springs, and metal fittings.
[Features]
• Adaptability to diverse shapes and materials
• Technical capability to meet complex requirements
• Precise bending and punching processing
• Capabilities from small-lot to mass production
[Main Products]
• Contact terminals
• Stoppers
• Various metal fittings
[Applications]
• Precision electronic devices
• Automotive parts
• Industrial equipment
• Communication devices
• Medical equipment
[Processing Technology]
• Bending process considering material characteristics
• Combination with punching process
• Compatibility with various materials (stainless steel, brass, shaped materials, etc.)
[Nippon Forming's Strengths]
• Product supply to a wide range of fields
• Consistent support from prototyping to mass production
• Continuous technological improvement
For inquiries about metal processing, please contact us. We manufacture high-quality products, accommodating complex shapes and special materials.
We are a specialized manufacturer of precision-processed wire and strip materials.
We work with various materials ranging from 0.1 to 5mm. Complex shapes are achievable through NC control.
[Company Information]
Nippon Forming Co., Ltd.
Headquarter & Main Factory: 1-23-2 Kanamachi, Katsushika-ku, Tokyo
Tsukuba Factory: 2924 Ujikai, Ishioka-shi, Ibaraki
https://www.forming.jp/eng/
Our company achieves precision riveting and thick plate punching by applying advanced die and press technologies.
This sample demonstrates punching a phosphor bronze plate with a thickness of t6, leaving a 0.2 thickness on all four sides using press technology.
By utilizing this technology, machining processes that would typically require cutting can now be achieved through pressing, allowing us to deliver optimal QCD (Quality, Cost, Delivery) solutions to our customers.
Key Features:
Thick plate punching with a smooth cut surface
Proprietary die technology
If you are facing challenges with fine press processing, please feel free to consult with us.
The punching method involves removing metal material through punching.
Using two 45-ton presses, the punching plate is processed into the required component size.
This punch is a die component made from SKH51 tool steel. It is used for applying diamond-pattern knurling to the side surface of collars.
For more detailed information about this product, please refer to the related page.
At Onuki Manufacturing, we handle not only the production of die components but also the manufacturing of complete dies.
If you have any questions or challenges, please feel free to contact us.
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Ohnuki Kogyosho Co., Ltd.
Sales & Production Control Department
Takuya Osumi / Miu Wada
📩 infoh@ohnuki.co.jp
📞 0294-53-3821
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