キョーワハーツ List of Products and Services

The mold is broken! The dimensions are unstable! Burrs and dents won't settle down! I want to modify the mold! Kyowa Hearts will utilize the technology and experience we have cultivated so far, and with passion, we will meet our customers' expectations. There are no issues with manufacturing from other companies or overseas production. We also respond to requests such as "There are no mold drawings" or "The cause of defects is unclear." If you are in a hurry or cannot incur new costs, please feel free to consult with us. Our experienced staff will assist you. If you send us the mold, we will provide a quote by the end of the day following its arrival. Furthermore, it is also possible to carry out pressing for the first lot and deliver it simultaneously. *For more details, please contact us or refer to our catalog.

In precision press processing, for composite shapes with gaps involving hemming bends and curling, we perform hemming (flanging) processing that does not adhere to the tip of the curling process. This ensures safety during assembly without the worry of injury. As one of our challenges in new processing technologies, we are working on progressive drawing processing. As a result, in addition to conventional curling techniques, we can offer drawing processing for items that require strength, thereby accommodating a wider range of customer development designs. For more details, please contact us or refer to our catalog.

The material of the small hole is stainless steel, with a thickness of 0.15, and a flatness of 0.08 or less, intended for use in shield cases. The thickness of the dowel is 0.2, the material is stainless steel, the flatness is 0.08 or less, the width is 0.8, and the bending height is 1.4. When these two are combined, they will not come apart even when dropped from a height of 20 cm, maintaining a flatness of 0.08 or less during engagement. 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, connector parts, and more. *For more details, please contact us or refer to our catalog.*

We have increased the strength by adding a 0.45 width beat to a 0.7 width. The material of the product is beryllium copper, with a thickness of 0.1, and the shape features a narrow foot width of 0.75, intended for use as a contact spring. 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.*

Precision press processing and true circular curling processing is a method of rounding without using a core. Each wing is curled individually and then rounded overall, resulting in a durable sliding spring. Kyowa Hearts specializes in "thin, small, and fine" plate spring processing, from handmade prototypes to precision press processing using precision progressive molds. We are particularly skilled in the production of compact plate springs for mobile phones, computers, and connector parts. For more details, please contact us or refer to our catalog.

Precision press processing involves the punching of numerous narrow slits, with 49 slits of 0.3 mm on each side, along with measures to prevent breakage during the production of thin punches. It also includes the hemming process at the tips of 50 pieces. Kyowa Hearts specializes in the processing of "thin, small, and narrow" flat springs, from handmade prototypes to precision press processing using precision progressive dies. We are particularly skilled in the production of compact flat springs for mobile phones, computers, and connector parts. For more details, please contact us or refer to our catalog.

At Kyo-Wa Hearts, we perform "micro press processing" for connector parts, terminals, and thin plate springs. From material and shape considerations to prototyping, mold manufacturing, and mass production, we utilize the technical skills, proposal capabilities, and problem-solving abilities we have cultivated over the years to solve our customers' challenges. 【Press Processing】 ■ Plate thickness: 1mm or less, minimum thickness 30μm ■ Size: Smaller than palm size, minimum size smaller than a grain of rice ■ Materials: SUS304, SUS631, SUS420J2 Phosphor bronze, nickel silver, beryllium copper, titanium ■ Application fields: Connector parts, terminals, thin plate springs *For more details, please refer to the PDF document or feel free to contact us.

We will solve the following problems: 'How should I bend a 90° bend that approaches a curl bend?' and 'How can I finish the hem (folded back) bend joint without any gaps?' Kyowa Hearts specializes in processing thin, small, and narrow leaf springs, from handmade prototypes to precision press processing using precision progressive dies. We are particularly skilled in the production of compact 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.

To fit with the counterpart parts, a roundness of 0.03 is an important point. The thickness of the product is 0.15, the material is phosphor bronze, and the shape is a curling diameter of φ2.3. Kyowa Hearts specializes in processing thin, small, and fine leaf springs, from handmade prototypes to precision press processing using precision progressive dies. We are particularly skilled in the production of compact leaf springs for mobile phones, computers, and connector parts. For more details, please contact us or refer to our catalog.

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.

This is a collection of case studies from Kyowa Hearts that solves various challenges such as weight reduction, long lifespan, miniaturization, assembly labor saving, fine precision, and process reduction. [Contents] - Integrated molding of resin and magnesium - Dissimilar material joining through precision drawing and laser sealing (SUS, copper, aluminum, etc.) - Small diameter drawing processing of brass LED parts with an inner diameter of φ0.7 - Roundness of 0.03, complex bending of phosphor bronze (curling diameter 2.3) - Skillfully achieving concentricity and coaxiality! Complex-shaped antenna elements - Corner tube drawing with progressive dies, processing of notches and dowels within the mold, etc. ● For more details, please download the catalog or contact us.

*Component integration leads to reduced assembly labor and, consequently, improved durability. Our company specializes in the complex shape processing of flat springs (especially contact springs) and can accommodate various shapes. *For more details, please download the PDF or contact us.

Press processing of thin, small, and slender leaf springs. From prototypes of contacts and leaf springs for mobile phones, computers, and connector parts to mass production processing through mold manufacturing. 【Features】 Thickness can start from 0.03 mm. *For more details, please download the PDF or contact us.

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.*

"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.

"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.

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.*

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.

"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.*

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.

This document introduces thin sheet press processing that leverages the plastic working capabilities of metal materials. It covers topics such as "judgment, consideration, and response to whether the design is suitable for the workability of metal materials," as well as explanations of "shearing" and "bending" processes. Consulting with us before formal product design can lead to the creation of products with excellent productivity and rational designs. Additionally, discussing during the design phase allows for the possibility of rational mold design using processing methods that are feasible for the plastic working capabilities of metals. We encourage you to read it. [Contents] ■ Considerations for selecting metal materials ■ Judgment, consideration, and response to whether the design is suitable for the workability of metal materials ■ Shearing processing ■ Bending processing ■ Drawing processing *For more details, please refer to the PDF document or feel free to contact us.

In this document, we introduce our company's efforts to work with difficult-to-process materials by material type. We provide detailed information on the use of press lubricants, processing of titanium, and processing of magnesium alloys. Additionally, our company will be exhibiting at the 46th Industrial Technology Exhibition "Technical Show Yokohama 2025" held at Pacifico Yokohama. [Contents (Excerpt)] ■ Press processing of stainless steel ■ Measures to improve mold durability ■ Processing of titanium ■ Processing of magnesium alloys ■ Nickel alloys *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.