Language: 日本語 | English
Language: 日本語 | English
High-precision and complex-shape processing of spring materials (SUS304, SUS631, beryllium, phosphor bronze, etc.)
We offer a comprehensive service, from considering shapes with 3-D diagrams to examining and proposing materials,
plate thickness and various processing methods, followed by testing, evaluation, progressive mold manufacturing and mass production.
We provide 100% support to speed up development for our customers.
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.
When manufacturing round shapes with press stamping there are two ways: curling and drawing.
Either method is available at our company.
We'll propose the optimal method keeping in mind the purpose for using the product, the required strength, the lead time allowed, etc.
Product Name: Connector Terminals
Material: C1100R-1/2H (ROHS Compliant)
Thickness: 0.2mm
Total Length: 2.9mm
Bending Angle: 135°
Expertise in Micro Precision Press Processing
Kyowa Hearts specializes in manufacturing thin, small, and narrow micro-press processed products. Our expertise particularly lies in the production of compact leaf springs and connector components for PCs and electronic devices.
From prototyping, mold design, and manufacturing to mass production, all processes are carried out in-house at our Yokohama factory, ensuring short lead times and flexible support to meet customer requirements.
We also have metal material specialists available, so please feel free to consult us regarding material selection or any other inquiries.
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
Material / Thickness:
Material: C2680R-1/2H
Thickness: 0.2mm
Processing Details / Precision:
Drawn Section: Outer diameter φ1.2, Height 3mm
Curling Section: Outer diameter φ7mm
Key Points in Progressive Die Manufacturing:
Ensuring that the φ1.2, Height 3mm narrow-drawn section is processed without tearing.
Designing the curling process to achieve roundness without using a core metal.
Key Points in Press Processing:
Proper handling of scrap from piercing the tip of the drawn section.
For more examples of deep drawing processing, click here:
https://www.kyowa-hearts.com/sibori/
☆ 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
Material: Beryllium Copper C1720R-HM
Sheet Thickness: 0.15 mm
Curling Outer Diameter: φ1.1 mm
Post-Press Processing: Gold Hoop Plating
The product is the round component in the center of the image. The lower three-fifths of the vertical section is shaped into four blades, with their tips evenly and tightly pressed together.
To ensure the four blade tips are securely in contact, various techniques are applied, such as surface pressing around the blades and shaping them into a perfect circular form. The biggest challenge in the curling process is preventing twisting and eccentricity, as the connecting section to the carrier is only 0.3 mm wide and the pre-curling developed length is just 3 mm.
If you are facing difficulties with precision curling processing, please feel free to contact us.
Other Examples of Leaf Spring Products
https://www.kyowa-hearts.com/spling/
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.
This is a deep drawing process for square copper tubes.
Manufactured from 0.6mm thick material using deep drawing and ironing processes.
Approximate dimensions: 9mm × 9mm, depth 68mm, sidewall thickness 0.25mm.
A die used for forward and backward extrusion of copper with a 160-ton cold forging press (knuckle joint press).
We operate an 80-ton transfer press and produce 500,000 cosmetic exterior parts per month.
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.
Nippon Forming specializes in designing and manufacturing durable stainless steel plate springs for LED lighting fixtures, engineered to prevent detachment.
[Features]
• Use of highly durable stainless steel materials
• Customization according to customer needs
• Long-term stable use realization
[Product Overview]
• Application: Secure fixation of LED lighting
• Materials: SUS304, SUS301, SUS316, etc.
• Shapes: Clip type, curl type, pinch type
[Main Use Cases]
• LED lighting fixture mounting
• Lighting equipment installation
• Industrial lighting fixation
• Outdoor LED device mounting
• Vehicle and building lighting fixture
[Processing Technology]
• Design considering springback
• Accommodation of complex three-dimensional shapes
• Surface treatment and plating process capabilities
[Nippon Forming's Strengths]
• Proposal of optimal materials and shapes
• Integrated support from prototyping to mass production
• Reliability ensured through high-precision processing
Nippon Forming is a specialized manufacturer of precision-processed wire and strip materials.
We work with various materials ranging from 0.1 to 5mm in diameter. 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/
Nippon Forming specializes in producing high-precision parts with complex shapes using multi-forming machines.
[Features]
• Capability to handle complex shapes
• Precision processing of materials with springback
• Flexible production from small to large quantities
[Product Overview]
• Automatic bending and forming of metal wire and sheet materials
• Support from prototyping to mass production
[Applications]
• Lighting fixture components
• UV equipment components
• Automotive parts
• Agricultural equipment parts
• Power system components
• Power distribution equipment parts
[Processing Materials]
• Nickel-plated hard steel wire
• Stainless steel wire for springs
• Various iron wires (ordinary, annealed, water-drawn, nickel-plated)
• Nickel silver, Inconel, Kovar wire
• SUS316 and others
[Nippon Forming's Strengths]
• Multi-product small-lot production
• Integrated service from material selection to finishing
• Design considering springback
Nippon Forming meets the processing needs for complex shapes and special materials, providing high-precision and durable products. We flexibly accommodate from small lots to mass production, so please feel free to contact us.
Nippon Forming is a specialized manufacturer of precision-processed wire and strip materials.
We work with various materials ranging from 0.1 to 5mm in diameter. 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/
This is a contact bushing component used in household appliances.
The processing method involves progressive pressing and riveting using phosphor bronze (t0.5) + silver.
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.
By crimping the pins using a progressive die, it becomes possible to minimize the use of expensive materials.
This component is a spring for a spacer.
Component size: 4mm
Plate thickness: 0.2mm
Processing method: Stainless steel is processed using a 45-ton press.
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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This product is manufactured using C1100 material with a sheet thickness of 1.6 mm.
From the initial shape to the final product shape, no machining processes are used.
Dimensions: 9 × 9 × t3.4
Tolerance: ±0.1
Post-press process: Nickel plating
Application: Power diodes designed to meet a wide range of needs, from general consumer and industrial equipment to automotive and electrical applications.
⁂ Dimensional and shape accuracy are ensured through in-process and final inspections using coordinate measuring machines (CMMs) and non-contact laser measuring devices, guaranteeing product functionality and reliability.
With many years of experience and proven technical expertise, we support manufacturing tailored to our customers’ needs.
※For inquiries, please contact us at the details below.
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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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A solid projection was formed on a 1.5mm thick plate in a single press process.
A proprietary technology following Warizaki (Japanese patent obtained).
Method Name: [Turm Method] ★ Turm means tower in German ★
The plate is drawn, and the drawn edge is split along the outer perimeter, forming a three-dimensional integrally molded piece.
[Outer Perimeter Warizaki] Method
A three-dimensional integrally molded piece is formed from a single plate.
ONLY ONE Processing Technology [Turm Method]
Achieves solid rectangular column projections on a thin plate in a single process.
Shinshu Yoshino Electric specializes in in-house production of metal press and injection molding dies, providing a seamless process from prototyping to mass production.
We have accumulated extensive expertise by working with a wide range of companies, addressing various manufacturing challenges.
With our contract manufacturing services, we offer solutions based on our accumulated processing know-how to help resolve your concerns.
Feel free to contact us for a consultation.
We specialize in precision micro-hole components for the low-voltage, home appliance, and office automation (OA) equipment industries.
Using stainless steel (SUS) and specialized resin films, we perform precision press processing to create fine holes.
Specifications:
Hole Diameter: φ0.100mm
Pitch: 0.15mm
Process Flow:
Press mold design & manufacturing → Press component processing
Product Details:
Size: 30mm × 40mm
Production Volume: 5,000 units/day
Production Lead Time: 1–2 months
Additionally, we manufacture a wide range of products, including those for the automotive industry.
For micro-hole press processing, please contact Shinshu Yoshino Electric.
In composite molding, multiple layers such as prepregs or preforms are often stacked together. Depending on the material volume and thickness, materials may overflow or protrude from the mold. As a result, pressure distribution becomes uneven, and the intended shape may not be achieved.
An effective solution to these issues is the use of a preforming die in the molding process.
【What Is a Preforming Die?】
A preforming die is an intermediate mold used to compress and roughly shape materials before final molding.
When stacked materials cannot properly fit into the final mold in one step, they are first compressed in a preforming die to create an intermediate product (a preform shape). This intermediate product is then placed into the final mold for pressing.
By stabilizing material flow in advance, the final product achieves:
Improved shape accuracy
More uniform pressure distribution
Cleaner surface finishes
【Advantages of Using a Preforming Die】
Although it may seem like adding an extra step, introducing a preforming die offers significant benefits:
Reduced material loss
Prevention of uneven material distribution or overflow
Improved yield rate
More stable product quality
Optimized laminate structure
Enhanced strength and dimensional accuracy
In many cases, even with an additional process, overall production efficiency and cost performance improve.
【Application to Chopped Fiber Molding】
Preforming dies are also effective when molding chopped fiber materials.
Chopped fiber materials consist of short fibers randomly mixed together and are suitable for complex shapes and small components. However, directly loading chopped fibers into the final mold can lead to:
Fiber distribution unevenness
Complicated and time-consuming manual work
Instead, chopped fibers can first be compressed and shaped into a billet (intermediate product) using a preforming die. The billet is then placed into the final mold for molding.
Compared to manually placing chopped material into fine areas with tools such as tweezers, using intermediate billets offers:
Faster processing
Higher repeatability
Improved product uniformity
Especially in mass production, combining billet preforming with final molding helps establish a stable production cycle and significantly enhances productivity.
【Cost Benefits】
Manufacturing a preforming die or billet mold requires initial investment in time and cost. However, over the long term, the reduction in material waste and process inefficiencies often results in greater cost savings.
This is particularly valuable when working with expensive composite materials. Minimizing waste has substantial economic benefits. In addition, improved product consistency reduces inspection and rework costs.
Overall, this approach enables:
Lower total production costs
Higher product quality
Greater process stability
【Summary】
Introducing a preforming die is not merely an additional process step—it is a strategic improvement that enhances molding quality, material yield, and productivity.
It is especially effective for:
Complex-shaped components
Chopped fiber molding
Applications where material flow and filling are challenging
Although it involves initial setup costs, it is increasingly recognized as a technology that balances long-term cost efficiency with high-quality manufacturing.
For operations seeking greater molding stability and improved quality, incorporating a preforming die into the process design is a highly effective option.
【Contact Information】
Kawamura Kikai Co., Ltd.
Head Office: 2-4 Shimizu-cho, Itabashi-ku, Tokyo 【Composite Division】
Hanazono Factory: 10 Kitane, Fukaya-shi, Saitama 【Metal Press Division】
Website: https://www.kawamura-kikai.co.jp
Inquiry / Quotation: https://www.kawamura-kikai.co.jp/contact/
Please mention that you saw us on “Emidas” when making your inquiry.
In metal press processing, what truly matters is precision, stable supply, and ease of consultation.
Not only drawing, bending, and blanking, but also whether you can entrust dies, welding, assembly, and surface treatment to one company makes a significant difference in both workload and quality.
“I'm not sure which supplier to choose.”
“Managing multiple processes separately is complicated.”
To reduce these concerns, one-stop production support is increasingly being chosen.
Common Challenges
Managing multiple vendors for different processes is complicated
Uncertainty about selecting the right processing method, leading to cost and quality concerns
Prototypes perform well, but quality becomes unstable in mass production
These issues often arise when processing and post-processing are outsourced
separately.
What Is Metal Press Processing?
Metal press processing is a manufacturing method in which sheet metal is shaped using dies and pressure.
By combining drawing, bending, and blanking operations, a wide range of component shapes can be produced.
It is highly suitable for mass production, enabling the stable supply of uniform-quality parts.
Advantages of One-Stop Production
In-house die design and manufacturing through press processing
Selection of optimal methods such as single-stage or transfer press according to product requirements
Integrated support for welding, caulking, assembly, and surface treatment
By entrusting even the post-processing steps, you can significantly reduce the workload related to ordering, coordination, and quality control.
Industries Served
Automotive and truck components
Railway-related parts
Decorative hardware and design components
Housing equipment and building materials
We support components requiring high precision and repeatability.
Benefits of Consolidating Your Orders
A single point of contact
Reduced variation in quality
Prevention of rework and delivery delays
Reliable transition from prototyping to mass production
Start with a Consultation
Even if your drawings are not yet finalized, that’s no problem.
We can assist from the stage of reviewing processing methods and organizing
production steps.
From prototype to mass production, we will work with you to determine the most
practical and efficient approach.
【Contact Information】
Kawamura Kikai Co., Ltd.
Head Office: 2-4 Shimizu-cho, Itabashi-ku, Tokyo 【Composite Division】
Hanazono Factory: 10 Kitane, Fukaya-shi, Saitama 【Metal Press Division】
Website: https://www.kawamura-kikai.co.jp
Inquiry / Quotation: https://www.kawamura-kikai.co.jp/contact/
Please mention that you saw us on “Emidas” when making your inquiry.
We also operate a Composite Division.
Composite Division URL: https://www.kawamura-kikai.co.jp/composite/
