Language: 日本語 | English
Language: 日本語 | English
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.
ONLY ONE Processing Technology [Split Method]
Splits a plate into three parts.
We specialize in assembling liquid mixing components for the weak current, home appliance, and OA (office automation) equipment industries.
The assembly process involves fitting, caulking, thermal welding, and ultrasonic welding of nine sub-components. Additionally, we also design and manufacture assembly equipment in-house.
Product Specifications:
Size: 70mm × 40mm × 10mm
Production Volume: 1,000 units/day
Production Lead Time: 4–5 months
Furthermore, our company manufactures a wide range of products, including those for the automotive industry.
For assembly services using plastic and press components, please contact Shinshu Yoshino Electric.
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.
We specialize in liquid sealing components for the weak current, home appliance, and office automation (OA) equipment industries.
Our two-color molding process utilizes polypropylene (PP) and elastomer (TPE) materials.
Production Process:
Resin mold design & manufacturing
Two-color molding (multi-cavity production)
Product Specifications:
Size: 10mm × 10mm × 3mm
Production Volume: 100,000 units/day
Production Lead Time: 2.5–3.5 months
Additionally, we manufacture a wide range of products for industries such as automotive manufacturing.
For two-color molding services, please contact Shinshu Yoshino Electric.
We specialize in housing components for lithium-ion batteries used in the weak current and home appliance industries.
Using polycarbonate (PC) material, we achieve thin-wall molding (t = 0.2mm) through high-speed injection molding.
Additionally, we offer textured surface processing, painting, and printing for a refined finish.
Product Specifications:
Size: 30mm × 40mm × 5mm
Production Volume: 7,000 units/day
Production Lead Time: 1.5–2.0 months
We also manufacture a wide range of products for industries such as automotive manufacturing.
For thin-wall molding services, please contact Shinshu Yoshino Electric.
【Do You Assume Fracture Surfaces Are Unavoidable?】
In press blanking, fracture surfaces are often considered inevitable.
However, in precision components such as gears, fitting holes, and sliding parts, they can cause accuracy loss, wear, noise, and looseness.
Although fine blanking offers high-quality shear surfaces, its cost and limitations can be restrictive.
An effective alternative is precision shearing using general-purpose presses.
【What Is Precision Shearing】
〈Maximizing shear surface by suppressing fracture〉
Precision shearing applies high constraint pressure to reduce fracture and increase the smooth shear area, ideally achieving full-shear through the thickness.
Benefits:
・Improved surface finish
・Stable perpendicularity and accuracy
・Reduced burrs
・Enhanced fitting performance
It also enables reduction or elimination of secondary machining processes.
【Achieving Full Shear with General Press Machines】
〈Precision without dedicated equipment〉
Full-shear can be achieved with general press machines by optimizing die design and process conditions.
Kawamura Kikai Co., Ltd. leverages extensive press expertise and 50 machines (10–500 t) to develop precision shearing on standard presses.
At the prototype stage, full-shear has been achieved by optimizing:
・Clearance based on material and thickness
・Die geometry for material flow
・Die rigidity
・Pressing conditions
【Manufacturing System and Capabilities】
〈Flexibility through in-house die production〉
With 70+ years of experience, the company handles die design, manufacturing, and maintenance in-house, enabling fast improvement cycles for:
・Prototype optimization
・Mass production durability verification
・Wear-based die modification
Additional processes such as spot welding, riveting, and assembly are also supported, allowing optimization at the unit level.
【Typical Applications】
Precision shearing with general presses is effective for:
・Gear and tooth-profile components
・High-precision hole brackets
・Thin sheet parts requiring strength and fit
・Mass-production parts targeting machining reduction
Stable shear surfaces reduce burrs and variation, improving assembly stability and productivity.
【Key Considerations When Evaluating Precision Shearing】
When considering precision shearing, the key question is not whether specialized equipment exists, but how well processing conditions can be designed.
Important factors include:
・Current shear surface ratio
・Impact of fracture surfaces on part functionality
・Potential to reduce secondary machining
・Dimensional stability in mass production
Even at the prototype stage, feasibility studies based on drawings or existing parts can help identify optimal processes.
【Summary】
Precision shearing is not only about higher accuracy, but also about improving overall manufacturing efficiency and quality stability.
With optimized die design and processing conditions, it is possible to approach full-shear results even with general press machines.
If shear surface quality or machining reduction is a concern, reviewing the forming process may provide a practical solution.
【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/
Consultations regarding precision shearing and full-shear processing using general press machines are available from the early planning stage. Sharing drawings or current challenges will help identify the most suitable processing method.
