共和精機 Product Lineup

Do you have any of these concerns? - Cracks around the bearing area and bolt holes of the differential case due to high torque loads on the rear wheels. - Long machining times for large cast iron workpieces, creating a bottleneck in the production line. - Poor yield from large integrated machining significantly increases manufacturing costs. Kyowa Seiki's "Precision Machining Contract Service for Rear Wheel Differential Cases" fundamentally resolves these issues. ◇ Precision machining using FCD material for high load capacity ◇ We use a robust ductile cast iron material that withstands harsh driving torque and perform precision machining without leaving distortions from thick to thin sections. ◇ Cost reduction through an approach utilizing the black skin of raw materials ◇ We propose a machining design that intentionally leaves the black skin surface, which contributes to strength reinforcement. This minimizes the amount of material removed, significantly cutting down on material waste and machining costs. ◇ Reliable technology that guarantees geometric tolerances for shaft holes ◇ We maintain high precision in the coaxiality of shaft holes, which affects the meshing of differential gears. This prevents torque transmission loss and unnecessary vibrations and noises. *For more details, please download the catalog or feel free to contact us.

• Processing Contract

Do you have any of these concerns? - The stopper part wears out due to repeated impacts during braking, causing misalignment in the braking position. - Removing the black skin from ductile cast iron is time-consuming, leading to excessive wear of cutting tools. - The positional accuracy of flow surfaces and mounting holes is insufficient, resulting in time spent on fine adjustments during on-site assembly. Kyowa Seiki's "Cast Iron Brake Stopper Precision Machining Contract Service" fundamentally resolves these issues. ◇ FCD Tough Machining Technology That Withstands Impact Loads ◇ Utilizing the properties of high-strength ductile cast iron (FCD), which excels in impact resistance, we perfectly enhance the surface roughness and parallelism of the pressure-receiving surfaces to ensure rigidity. ◇ Cost Reduction Proposal Through Shape Design That Utilizes Black Skin ◇ For non-contact surfaces that do not directly receive impacts, we adopt a machining approach that retains the black skin. This achieves both a reduction in tool costs and a significant shortening of processing time. ◇ Maintaining Positional Accuracy for Mass Production of Various Types ◇ We thoroughly manage the perpendicularity and positional accuracy of reference holes and mounting surfaces using fixed jigs and machining technology, eliminating unnecessary adjustment work on-site. *For more details, please download the catalog or feel free to contact us.*

• Processing Contract

Do you have any of these concerns? - Excessive load on bearings due to inner diameter deformation after press-fitting, causing abnormal noise. - Geometric tolerances (coaxiality, perpendicularity) of cast iron housings not being met, leading to shorter bearing life. - Chucking distortion occurring during machining of thin-walled sections, resulting in high scrap rates due to exceeding dimensional tolerances. Kyowa Seiki's "Cast Iron Bearing Holder Precision Machining Contract Service" fundamentally resolves these issues. ◇ High-precision inner diameter machining that achieves roundness and coaxiality ◇ By employing jigs and machining approaches that consider clamping distortion and deformation from machining heat in cast iron materials, we reliably maintain fine inner diameter tolerances. ◇ Precision lathe technology that prevents deformation even in thin-walled sections ◇ Our unique clamping technology and NC lathe machining significantly reduce defect rates, even for thin-walled shapes. ◇ Reduction of total costs through the utilization of black skin surfaces ◇ We propose blank designs that leave black skin on the outer circumference and non-precision surfaces. This shortens the cutting process while providing high quality at low prices. *For more details, please download the catalog or feel free to contact us.

• Processing Contract

Do you have any of these concerns? - Changes in braking feel due to uneven wear on the cam surface from continuous operation, leading to complaints. - Difficulty maintaining the precision of sliding parts due to bending of the shaft section of the camshaft under high loads. - Increased costs due to severe wear of cutting tools as materials become harder to machine to enhance wear resistance. Kyowa Seiki's "Cast Iron Brake Cam Precision Machining Contract Service" fundamentally resolves these issues. ◇ Precision machining that creates smooth sliding surfaces for cam shapes ◇ Our high-precision R surface and curved surface cutting technology reduces friction resistance during operation, preventing uneven wear and supporting long-term maintenance of braking performance. ◇ Distortion suppression approach that brings out the characteristics of FCD material ◇ We minimize distortion that occurs during the machining of ductile cast iron (FCD), which is strong against impact and high loads, ensuring strict dimensional tolerances are met. ◇ Cost reduction solution that retains black skin where appropriate ◇ We propose shapes that leave black skin on non-sliding parts that do not affect functionality. This eliminates unnecessary machining processes and provides affordable, robust components. *For more details, please download the catalog or feel free to contact us.

• Processing Contract

Do you have any of these concerns? - Oil leaks due to distortion at the gear case joint surface, leading to a backlog of inspection work. - Chipping of cutting tools and variations in dimensional accuracy caused by the unique porosity and hardness irregularities of cast iron. - Excessive unnecessary machining due to full cutting, resulting in increased material costs and processing time. Kyowa Seiki's "Precision Cutting Processing Contract Service for Cast Iron Gear Cases" fundamentally solves these issues. ◇Reducing material loss through effective utilization of black skin with shape proposals◇ We propose a machining plan that avoids full cutting and retains the black skin on areas that do not affect strength. This reduces cutting processes and unnecessary material waste, achieving cost savings. ◇High-precision cutting technology that meets strict geometric tolerances◇ We suppress distortion caused by residual stress in FC and FCD materials, maintaining high standards for surface roughness and flatness at the joint surface. This minimizes the risk of oil leaks and significantly extends product lifespan. ◇Stable mass production system through collaboration between lathes and machining centers◇ Our highly automated processing equipment ensures consistent dimensional accuracy even for cases with complex internal structures. *For more details, please download the catalog or feel free to contact us.

• Processing Contract

Do you have any of these concerns? - Cast iron parts are wearing out or breaking prematurely in harsh operating environments, leading to product complaints. - There is a significant material loss due to full machining, resulting in high processing costs that are not profitable. - Variability in machining accuracy during mass production is causing delays in delivery and supply shortages, putting a burden on the site. Kyowa Seiki's "Precision Cutting Processing Contract Service for Ductile and Gray Cast Iron" fundamentally resolves these issues. ◇ Cost reduction through shape proposals that utilize the black skin ◇ By avoiding full cutting and proposing designs and processing that leave the black skin surface, we suppress unnecessary cutting work and material waste. This achieves significant cost reductions while maintaining performance. ◇ Precision cutting technology specialized for cast iron that stabilizes accuracy ◇ We address the unique distortions and machining difficulties of FC and FCD materials. Using NC lathes and machining technology, we maintain strict dimensional tolerances and significantly extend the lifespan of parts. ◇ Flexible mass production capacity and stable supply system ◇ Our well-equipped facilities can handle mass production. We eliminate concerns about line stoppages and support stable supply with short lead times and as planned. *For more details, please download the catalog or feel free to contact us.

• Processing Contract

In the automotive parts industry, high precision and cost efficiency are required for components such as engine blocks. In particular, total machining from solid materials or round bars can lead to increased processing time and material costs, resulting in unprofitable situations. Additionally, while there is a desire to reduce labor costs by leaving the black skin (unprocessed surface), challenges arise due to the difficulty in designing processing costs and dimensional tolerances, and the lack of proposals from existing processing companies. Although there is a desire to control costs through casting (FC/FCD), it can be difficult to find cooperative factories that can consult on design changes. Kyowa Seiki's "Casting (FC/FCD) Precision Machining and Cost Reduction Solution" addresses these challenges by providing processing proposals that utilize the black skin. 【Usage Scenarios】 - Cost reduction in mass production of engine blocks - Suppression of increased labor and material costs from total machining of steel materials - Realization of labor cost reduction through black skin remaining processing - Cost reduction through casting (FC/FCD) 【Benefits of Implementation】 - Improved profitability through reduced processing time and material costs - Response to design changes and special processing requests - Reduction of component costs through casting - Increased production efficiency in mass production

• Processing Contract

In industrial machinery, components such as gearboxes require high precision and durability. Particularly for parts used under harsh conditions, the selection of materials, machining accuracy, and a stable supply system significantly influence the reliability of the products. Inadequate machining or material selection can lead to premature wear or damage, ultimately resulting in a decline in the overall performance of the machinery. Kyowa Seiki's "Mouse Cast Iron and Ductile Cast Iron Precision Machining Contract Service" addresses these challenges and provides parts processing tailored to customer needs. 【Application Scenarios】 - Gearbox components for agricultural machinery - Drive system components for construction machinery - Joint components for industrial robots 【Benefits of Implementation】 - Cost reduction through proposals that leverage the black skin for lower costs - Short delivery times and stable supply due to mass production capacity - Improved component lifespan through high-precision machining

• Processing Contract

In the construction machinery industry, the selection of materials and processing precision are crucial in the manufacturing of hydraulic components that require high durability to withstand harsh operating environments and precise operation. Particularly in the machining of cast iron components, issues such as chip clogging and tool wear can affect processing efficiency and product accuracy. In response to these challenges, Kyowa Seiki's "Mouse Cast Iron and Ductile Cast Iron Precision Machining Contract Service" meets customer needs. 【Usage Scenarios】 - Hydraulic pump components for construction machinery - Hydraulic motor components for construction machinery - Mass production of other FC and FCD components 【Benefits of Implementation】 - Reduction in material costs and processing man-hours - Stable supply of components with consistent accuracy - Increased productivity through shortened delivery times

• Processing Contract

In the agricultural machinery industry, a stable supply of drive components that can withstand harsh operating environments is required. In particular, parts made of gray cast iron and ductile cast iron are widely used due to their strength, but issues such as chip clogging in machining and tool wear can make it difficult to find outsourcing partners. Additionally, challenges such as "when we estimated machining from round bars according to the drawings, the processing time and material costs skyrocketed, making it unprofitable" and "while the prototype went smoothly, transitioning to mass production resulted in unstable precision and supply concerns" are not uncommon. Kyowa Seiki's "Precision Machining Contract Service for Gray Cast Iron and Ductile Cast Iron" addresses these issues. [Usage Scenarios] - Drive components such as crankcases and cylinder blocks for agricultural engines - Gearbox parts for tractors - Other high-precision parts made of gray cast iron and ductile cast iron [Benefits of Implementation] - Avoid unnecessary total machining, achieving both the retention of component strength and significant labor reduction - Stable supply with short lead times and high precision for medium to large lot mass production - Improved productivity through cost reduction and stabilization of supply

• Processing Contract

"When we estimated the cost of machining from solid wood or round bars according to the drawings of agricultural and construction machinery parts, the processing time and material costs skyrocketed, making it unprofitable..." "I want to reduce labor costs by leaving the black skin (unprocessed surface), but designing processing costs and dimensional tolerances is difficult, and I can't get proposals from existing processing companies..." "I want to reduce costs by using casting (FC/FCD), but I can't find a skilled cooperative factory that can consult with me from the drawing change stage..." Are you facing such barriers in the procurement, purchasing, and production technology departments of major manufacturers? Kyowa Seiki's "Casting (FC/FCD) Precision Machining and Cost Reduction Solutions" fundamentally solves these problems. *Download the catalog for case studies and details!

• Processing Contract

"After obtaining a quote for total machining (complete machining) from a round bar according to the drawing, the processing time and material costs skyrocketed, making it unprofitable..." "Although the prototype phase went smoothly, once we transitioned to mass production, the accuracy became unstable, leading to supply concerns..." Are you facing such challenges in the purchasing, procurement, or production technology departments of your manufacturing company? Kyowa Seiki's "Precision Cutting Processing Contract Service for Gray Cast Iron and Ductile Cast Iron" fundamentally resolves these issues. - Cost reduction proposals from the drawing stage that leverage the black skin: We propose a meticulous machining design that considers the shape in advance and leaves 30-50% of the black skin (unprocessed surface) intact. This avoids unnecessary total machining while maintaining part strength and significantly reducing labor hours. - Mass production capacity with 49 machining centers and 27 NC lathes: With approximately 100 machines, including 10 horizontal and 39 vertical machining centers, we ensure stable supply with short lead times and high precision for medium to large lot production. *Download the catalog for case studies and more details!

• Processing Contract

"I want to request casting processing, but with our in-house line, powder chips get into the gaps of the machines, leading to frequent aging and breakdowns... Unlike SS400, the chips are finely dispersed, resulting in significant maintenance effort and rapid tool wear, which increases costs..." Are there such cries of distress on the shop floor? Kyowa Seiki's "Cast Iron Precision Cutting Processing Service" fundamentally solves these problems. Processing know-how specialized in FC and FCD materials: Processing of gray cast iron (FC) and ductile cast iron (FCD) accounts for 90% of our work, and we are well-versed in the specific behaviors of these materials. Overwhelming number of facilities and strict machine maintenance: We own 49 vertical and horizontal machining centers and 27 CNC lathes. Our thorough maintenance system focused on powder chip countermeasures maintains high precision and on-time delivery rates. Proposal for optimizing man-hours from the drawing stage: By suggesting ultra-fine cutting that utilizes the black skin, we prevent the inflation of man-hours due to total machining and the decline in durability. *For case studies and details, please download the catalog!

• Processing Contract

Our company is engaged in the processing and manufacturing of diesel engine parts, tractor parts, and other components at the Shin-Tone Industrial Park in Inashiki City, Ibaraki Prefecture. In addition to processing samples using 5-axis machining and 3D printers, we also accommodate the production of objects and other items. We have a track record of being adopted in tenant buildings such as "LAQUE" in Shijo Karasuma, Kyoto. Furthermore, we can also produce lighting panels, vases, and other items based on the CAD data you provide, so please feel free to contact us. 【Business Description】 ■ Processing and manufacturing of diesel engine parts, tractor parts, pneumatic parts, hydraulic parts, and other components * We also accommodate processing samples and the production of objects using 5-axis machining. * For more details, please download the PDF or contact us.

• Other Auto Parts
• Contract manufacturing
• Processing Contract