協立製作所 List of Products and Services

We will introduce the technology incorporated in the process of "assembly work." By assigning addresses to the shelves (parts shelves) where parts are stored and fixing them to a specific location, we prevent mistakes in part numbers during the parts input process. Additionally, by preparing parts for one unit at a time, we make it easy to visually confirm the parts. Furthermore, we have installed a counter and a torque wrench with a limit switch on the workbench, which counts the number of tightening actions to prevent forgetting to tighten. 【Features】 <Fixed Addressing of Assembly Shelves and Display of Actual Samples> ■ Prevents mistakes in part numbers during input ■ Allows for comparison to ensure the part is the same as the desired one <Complete Kit of Assembly Parts> ■ Simplifies parts confirmation to prevent mistakes and omissions in parts *For more details, please refer to the related links or feel free to contact us.

• Processing Contract

We would like to introduce the technology related to "heat treatment" held by Kyoritsu Seisakusho. In "gas carburizing and nitriding," we use a carburizing gas RX with 5% to 10% ammonia added. The treatment temperature is between 750°C and 900°C, and the treatment time is shorter than that of gas carburizing, allowing for the formation of a thin hardened layer. Additionally, we possess technologies such as "gas soft nitriding" to improve wear resistance and fatigue resistance, as well as "quenching and tempering." 【Features of Gas Carburizing and Nitriding】 ■ Uses carburizing gas RX with 5% to 10% ammonia added ■ Treatment temperature is between 750°C and 900°C, with a shorter treatment time than gas carburizing ■ Achieves a thin hardened layer ■ Hardening depth ranges from 0.1mm to 0.8mm ■ The carbonitriding layer improves hardenability *For more details, please refer to the related links or feel free to contact us.

• Processing Contract

We would like to introduce the technology of "grinding processing" at Kyoritsu Seisakusho. In addition to "cylindrical grinding," which can achieve roundness within 1μ and surface roughness within 0.4a, we possess technology for external diameter polishing such as "centerless grinding." On the other hand, "internal diameter polishing" involves chucking the workpiece's outer diameter and using a spindle-mounted grinding wheel to finish the inner diameter. We also perform "honing," which can process lengths of approximately 80mm with precision equivalent to that of internal diameter polishing. 【Types of Processing Technologies】 <External Diameter Polishing> ■ Cylindrical Grinding ■ Centerless Grinding <Internal Diameter Polishing> ■ Internal Diameter Polishing ■ Honing *For more details, please refer to the related links or feel free to contact us.

• Processing Contract
• Grinding Machine

We would like to introduce the technology of "Machining Center Processing" at Kyoritsu Seisakusho. In external diameter processing, we possess technologies suitable for machining stopped holes with specified depths, including "Drilled Hole Processing," "Groove Processing," and "True Circle Processing." On the other hand, for end face "Drilled Hole Processing," we use horizontally oriented rotating tools, allowing us to drill holes at any position on the end face. Additionally, we also perform end face processing such as "Surface Processing" and "True Circle Processing." 【Types of Processing Technologies】 <External Diameter Processing> ■ Drilled Hole Processing, Groove Processing, True Circle Processing <End Face Processing> ■ Drilled Hole Processing, Surface Processing, True Circle Processing *For more details, please refer to the related links or feel free to contact us.

• Processing Contract
• Machining Center

We will introduce our company's "lathe processing" technology, divided into two types: outer diameter and inner diameter. "Outer diameter cutting" involves pressing a cutting tool against the outside of a rotating workpiece, similar to peeling skin. On the other hand, "inner diameter cutting" involves applying the cutting tool from the inside of the rotating workpiece, akin to peeling the inner skin. In addition, Kyoritsu Seisakusho possesses processing technologies such as "end face cutting," "outer diameter groove cutting," "inner diameter groove cutting," and "drilling & threading." 【Types of Processing Technologies】 ■ End face cutting ■ Outer diameter cutting ■ Outer diameter groove cutting ■ Inner diameter cutting ■ Inner diameter groove cutting ■ Drilling & threading *For more details, please refer to the related links or feel free to contact us.

• Processing Contract
• lathe

We would like to introduce the technology of Kyoritsu Seisakusho in "machining." "Lathe machining" involves cutting by rotating the workpiece and moving the cutting tool, while "machining center processing" is a method that involves rotating the cutting tool to machine the workpiece fixed on the table. Additionally, our company performs various types of "grinding," using different grinding machines such as cylindrical grinders, internal grinders, centerless grinders, and surface grinders, depending on the shape of the workpiece, to grind spools and small parts. [Features] ■ Lathe Machining - Cuts (removes material) by rotating the workpiece and moving the cutting tool. ■ Machining Center Processing - Equipped with an automatic tool exchange function, allowing for various types of machining such as milling, boring, and threading to be performed on a single machine according to the purpose. *For more details, please refer to the related links or feel free to contact us.

• Processing Contract
• Machining Center
• lathe

At Kyoritsu Seisakusho, we handle various processed components related to hydraulics for hydraulic excavators and industrial machinery. We are capable of providing integrated processing from machining to polishing. In particular, we utilize our expertise to manufacture high-difficulty products with strict tolerances. Please feel free to contact us when you need our services. 【Features】 ■ A variety of processed components related to hydraulics for hydraulic excavators and industrial machinery are available. ■ Capable of manufacturing high-difficulty products with strict tolerances. *For more details, please refer to the related links or feel free to contact us.

• Processing Contract
• Other machine elements
• Hydraulic Equipment

At Kyoritsu Seisakusho, we are currently manufacturing 'Pump ASSY' with a displacement of 65-90cc/rev, primarily for small construction machinery in the 5-10 ton range. This product is akin to the heart in a human being. Similarly, burrs are one of the significant issues. For the casings of the pump ASSY produced in-house using M/C, we have created a work instruction manual for burr removal and pay careful attention to burr processing. Our company is also equipped with a dedicated test bench. We conduct performance tests under conditions equivalent to those used in actual machines. 【Features】 ■ Mainly used for small construction machinery in the 5-10 ton range ■ A work instruction manual for burr removal has been created for the casings of the pump ASSY, with careful attention paid to burr processing ■ Equipped with a dedicated test bench *For more details, please refer to the related links or feel free to contact us.

• Other pumps

At Kyoritsu Seisakusho, we manufacture "control valve spools" for medium-sized hydraulic excavators ranging from 7 to 30 tons. We carry out all processes in-house, including lathe machining, M/C machining, thermal deburring, heat treatment, and polishing. Our company adds a process called thermal deburring. We perform deburring both manually and mechanically. Additionally, for some customers, we deliver products that can be assembled directly into control valves after finishing polishing, including the assembly of springs and plugs, allowing us to respond flexibly to customer requests. [Features] ■ Addition of the thermal deburring process ■ Deburring performed both manually and mechanically ■ Flexible response to customer requests *For more details, please refer to the related links or feel free to contact us.

• Processing Contract
• Other machine elements

Kyōritsu Seisakusho started in 1954 with the grinding of cutting tools and has since expanded to include the grinding of hydraulic components, as well as a consistent process from cutting to heat treatment to polishing. We have built our know-how to respond to the needs of the times and the demands of our customers, and we now manufacture hydraulic equipment. For our main product line, the ASSY products, we conduct repeated performance tests during development prototypes and pre-mass production prototypes to ensure better accuracy, pursuing high-quality products in collaboration with our customers. Kyōritsu Seisakusho places particular emphasis on quality from prototyping to mass production, continuously improving to meet customer demands and earning their trust. At the same time, we respond quickly in terms of delivery and pricing, achieving our customers' requirements. We provide speedy and comprehensive assistance from prototyping to mass production. *For more details, please refer to the related links or feel free to contact us.*

• Contract manufacturing
• Prototype Services
• Processing Contract

Our company handles various types of valve assemblies. We perform integrated processing from machining to assembly and inspection (and in some cases, painting as well). Additionally, we use dedicated assembly lines and test benches to deliver products that meet the performance specifications indicated in the drawings. 【Products Offered】 ■ Valves for outrigger and ram cylinders ■ Check valves ■ Valve assemblies (solenoid valves) *For more details, please feel free to contact us.

• Hydraulic Equipment