「Light/consumer appliances ・ Electronic parts 」 9items
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We make everything from plates to three-dimensional objects. We perform cold forging on shapes that aren't possible with cutting!

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.

If you have a die but are having trouble with press stamping, then 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.

C5191 t0.15 Leaf spring with - Circularity 0.03

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

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

Ultra-Deep Drawing

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.

Transfer Press

A 30-ton transfer press used for multi-stage deep drawing of stainless steel.

Precision Processing of Plate Springs, Wire Springs, and Metal Bending/Punching

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/

Replacing Machining with Press Processing – [Thick Plate Pressing]

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.

Progressive Die Method for Press Processing Punching Plates

The punching method involves removing metal material through punching.

Using two 45-ton presses, the punching plate is processed into the required component size.

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