キョーワハーツ List of Products and Services

At Kyo-Wa Hearts, we specialize in the processing of "thin, small, and fine" plate springs. We are particularly skilled in the production of contacts and plate springs for mobile phones, computers, and connector parts. The processing of plate springs relies on an understanding of the material properties, especially experience related to springback, supported by accumulated data. Once the design is complete, we start with prototyping. We can handle blank processing through laser cutting, wire electrical discharge machining, and etching, as well as bending processing using temporary molds, accommodating quantities from one to one thousand. For mass production, we utilize progressive dies, capable of producing from 5,000 to over one million units. We cover all aspects. *For more details, please contact us or refer to our catalog.

The clearance is said to be 5% of the normal plate thickness, which means that for a plate thickness of 50μm, it would be 2μm. At this level, fine adjustments by humans are required, exceeding the precision of machine tools. Kyowa Hearts specializes in processing "thin, small, and fine" leaf springs. We are particularly skilled in the production of contacts and leaf springs for mobile phones, computers, and connector parts. For more details, please contact us or refer to our catalog.

The technology for extracting slits below the thickness of small parts involves creating a triangular shape for strength while ensuring point contact with the counterpart component. The material of the product is phosphor bronze, the thickness is 0.3, the slit width is 0.2, and the application is contact springs. Kyowa Hearts specializes in processing thin, small, and fine plate springs, from handmade prototypes to precision press processing using precision progressive dies. We are particularly skilled in the production of compact plate springs for mobile phones, computers, and connector components. For more details, please contact us or refer to our catalog.

"Designing Springs and Material Selection That You Can't Ask Now" is a document created by our company, which specializes in processing leaf springs, based on our know-how regarding the properties of materials. It introduces the key points for material selection, including the necessary elements and the selection process based on mechanical properties. This document is useful for situations such as, "I have inherited past drawings, but I don't know how to make the necessary springs," or "I don't know what criteria to use for selecting materials." 【Contents】 ■ Elements necessary for material selection ■ Selection process based on mechanical property data ■ Characteristic values of representative materials *You can view it immediately via PDF download. Please feel free to consult us about prototypes or material selection based on drawings or some parts.

This document contains know-how for manufacturing products using stainless steel as a spring material. It provides detailed explanations on points regarding the use of stainless steel as spring material, such as "selecting materials based on strength levels" and "determining the feasibility of processing by checking the bending characteristics of the material at the finishing level." Additionally, it introduces joining techniques such as "physical joining" and "welding." We encourage you to read it. [Contents] ■ The basics of stainless steel involve adding chromium to provide corrosion resistance. ■ Material selection is based on strength levels. ■ The feasibility of processing is determined by checking the bending characteristics of the material at the finishing level. ■ Other related technologies. *For more details, please refer to the PDF document or feel free to contact us.

This is a collection of solution case studies from Kyo-Wa Hearts Co., Ltd., which handles precision and fine pressing, leaf spring processing, and everything from prototypes to mass production. It includes information on various connection terminals, examples of small diameter drawing, and key points for mold manufacturing. Additionally, the Q&A section answers frequently asked questions such as "About good contractors" and "Materials that can be processed." 【Included Items】 ■ Proof of stable product quality ■ Examples of small diameter drawing processing ■ Fine bending and punching products ■ Q&A Frequently Asked Questions *For more details, please refer to the PDF materials or feel free to contact us.

In product development, what measures are necessary to avoid failures as much as possible? First, consider the molds required for the product and carefully think about whether the dimensions and shape of the product will satisfy customer needs. Next, it is essential to scrutinize the information necessary for mold processing and product assembly and accurately convey it to the responsible engineers. In other words, detailed specifications, design drawings, and mold blueprints are required. It goes without saying that it is important to place orders with vendors who have extensive experience in prototype production and possess a wealth of know-how. *For more details, please download the PDF or contact us.*

"MagClean" is a product that utilizes the excellent antibacterial properties of silver and a lightweight magnesium alloy. It is useful in various situations from leaving home to returning, as it can be used to touch items such as train handrails, handrails, elevator buttons, vending machine buttons, doorknobs, and thumbturns, acting as a substitute for hands. Additionally, leveraging the ultra-lightweight characteristics of magnesium, we have created a product so light that you might forget you have it in your pocket while out. 【Features】 ■ Touchless ■ Touches various items that many people come into contact with while out, acting as a substitute for hands ■ Useful in various situations from leaving home to returning ■ Incorporates our technology to realize outstanding features and excellent performance * A PDF is available that explains the "Utilization Technology of Magnesium Alloys" and "Coating Technology that Exhibits Antibacterial Effects"! * For more details, please refer to the PDF document or feel free to contact us.

At Kyo-Wa Hearts, we manufacture products from magnesium alloy sheets through press processing. Die-casting molds and casting equipment are not required. Magnesium alloy products can be made using standard press molds and press machines. We provide product manufacturing that leverages the excellent properties of magnesium alloys.

At Kyo-Wa Hearts, we manufacture products using magnesium alloy sheets through press processing. There is no need for die-casting molds or casting equipment. Magnesium alloy products can be made using standard press molds and press machines. We offer product manufacturing that leverages the excellent properties of magnesium alloys. *For more details, please download the PDF or contact us.*

"What are the functions of the parts required by the customer? Where is precision truly needed?" We will ask the customer's design representatives and our sales representatives will propose and consult on the machining characteristics and limits of the materials to be processed. *For more details, please download the PDF or contact us.*

"I was wondering where to order leaf springs." If that's the case, leave it to Kyowa Hearts! "But the materials from Kyowa Hearts are hard to read because they are filled with wall text!" Yes, I apologize for that. That's why we've added skilled editors to include a table of contents and summarize the text, making it incredibly easy to read. This time, since it's a collection of leaf spring examples, there are actually more photos than text, so you can read it quickly! Please leave your leaf springs to Kyowa Hearts! *For more details, please download the PDF or contact us.

It is not uncommon for mild, stain-like substances that are difficult to classify as rust to occur. To prevent these defects from arising in our products, we proceed with our work while keeping in mind the characteristics that lead to rust. This document introduces the conditions and environments under which various metals rust. We have succinctly summarized the conditions and environments that induce rust in various metal materials. Through the accumulation of knowledge and experience, we are well-versed not only in press processing technology but also in metal materials. Our team consists of professionals in metal processing. Would you like to solve your metal processing concerns together with us? Please feel free to contact us! *For more details, please download the PDF or contact us.*

1. Leaf Spring 2. Stacked Leaf Spring 3. Disc Spring 4. Coil Spring At Kyowa Hearts, we specialize in thin plate spring products, which are difficult to assess in performance through desktop simulations, focusing on spring characteristics, sliding properties, and durability. From prototyping to mass production of leaf springs, when time is limited, please utilize our proposal capabilities, material procurement capabilities, and short delivery response capabilities. For the production of blank shapes (cut shapes) during prototyping, we select from fine laser processing (beam diameter 0.03), wire electrical discharge machining, etching processing, and press processing using simple molds, considering precision and quantity. We strive to achieve short delivery times and low costs by using as many of our extensive hand-held temporary molds as possible for bending processing. From the early stages of development, we aim to be a good partner in your development by interpreting the appeal requirements of leaf spring components and proposing the optimal materials and methods.

At this point, metal products are making significant contributions to the 17 themes of the SDGs. This document includes a table presenting the theme "Contribution of Steel to the SDGs" from the World Steel Association, an international industry organization for the steel industry. It shows the themes contributing to each of the SDG principles. By comparing the principles and themes, one can understand how the physical properties of steel materials contribute to the SDGs. Additionally, it discusses the use of human-friendly metal materials. We encourage you to read it. [Contents] ■ Table 1 "Contribution of Steel to the SDGs" ■ Use of metals contributing to the SDGs ■ Table 2 Current status and characteristics comparison of antimicrobial metal materials *For more details, please refer to the PDF document or feel free to contact us.

At Kyo-Wa Hearts, we specialize in the manufacturing of thin plate springs. In this document, we will introduce information following the basic selection methods, including examples of material selection based on customer inquiries and usage cases in special environments. Additionally, we will be exhibiting at the "Metal Press Processing Technology Exhibition" and the "Machine Elements Technology Exhibition," both held from June 21 (Wednesday) to June 23 (Friday), 2023. We sincerely look forward to your visit. [Contents] - Use of stainless steel and copper and copper alloys - Selection of non-magnetic spring materials at high strength levels - Considering the use of spring materials in high-temperature environments - Spring materials used in corrosive environments - Examples of springs with special structures *For more details, please refer to the PDF document or feel free to contact us.

In this document, we will introduce the curling products processed by Kyowa Hearts, focusing on key points for mold production and press processing. We will present examples such as the "contact spring," which was designed to prevent the workpiece from shifting during bending processing to achieve roundness for thin curling processing (inner diameter 0.3), and the "sliding spring," which has three blades shaped in a tapered form, requiring careful alignment of the upper and lower parts. Additionally, we have included processing achievements related to materials at the end of the document. We encourage you to read it. [Contents (excerpt)] - Contact Spring (C1720 t0.06) - Sliding Spring (C1720 t0.15) - Drum Spring (C1720 t0.15) - Drum Spring (C1720 t0.1) - Antenna Element (C5210 t0.2) *For more details, please download the PDF or feel free to contact us.