山田マシンツール List of Products and Services

Thread rolling is the process of deforming a round bar material by pinching it between multiple rolls shaped like threads and pressing it while rotating, thereby creating the shape of the thread. Thread rolling is performed as a cold forming process that does not produce chips. The material's structure is deformed without being cut. By plastically deforming the material, advantages such as increased strength and corrosion resistance, which are not found in cutting processes, can also be obtained. Thread rolling is widely used for various types of threads, including triangular, acme, trapezoidal (TR), buttress, tapered, and special-shaped threads. Until now, thread rolling required a dedicated machine for a standalone process, but by incorporating tools proposed by YAMADA into NC machines or automatic lathes, significant reductions in processing time and advanced automation can be achieved. 【Contents】 - What is thread rolling? - Can any material be processed? - What shapes can be made through rolling? For more details, please contact us or download the catalog. *This catalog is a digest version. If you need the full version, please contact us.

Waring processing is a method that allows for the efficient machining of long screws, high-lead screws, worm gears, and more using automatic lathes. It involves using a special disk equipped with numerous inserts, which is mounted on a dedicated holder that allows for angle adjustments. The disk is offset relative to the workpiece, and both the workpiece and the ring are rotated in the same direction during machining. This method minimizes burr formation and can efficiently process workpieces with large cutting volumes, making it widely used for machining titanium and stainless steel bone screws. At Yamada Machine Tool, we can provide total coordination for the introduction of PCM-made tool holders, disks, and inserts used for this special processing.

The screw rolling head typically involves three rolls and enters the material from the end face in the axial direction to roll the screw. Since it uses a step rolling method that rolls one thread at a time from the tip, it places less load on both the machine and the workpiece. Regardless of the rotation speed, it advances by the pitch per rotation. The rolls can advance in the axial direction regardless of their length, allowing for flexible setting of the screw length. There are F-type heads used for rotating workpieces (such as lathes) and G-type heads that can rotate the head (used for machining centers, etc.). ■ Features of the ARC screw rolling head - It can be mounted on a CNC lathe, allowing the cutting process and the rolling process to be consolidated into one CNC lathe. ■ Advantages of rolled screws 1. Improved screw strength Strength is enhanced due to work hardening from plastic deformation and densification of the structure. 2. Improved surface roughness The surface is varnished and has a glossy finish. 3. Reduced processing time With high peripheral speed and pitch feed, the processing time is relatively short for finishing. 4. Reduced setup time The lifespan of the rolls is generally longer compared to cutting tools, which reduces the frequency of tool changes. 5. Prevention of burrs, cracks, and rust The structure becomes stronger due to plastic deformation, significantly reducing the defect rate.

This is a brand suitable for screw machining larger than ARC size and for rolling heads mounted as dedicated machine attachments. ■ Features of VABS (Vabs) Screw Rolling Heads - Can be mounted on CNC lathes, allowing the integration of cutting and rolling processes into a single CNC lathe. - Has a wealth of experience in processing large screws ranging from a minimum of M2.6 to a maximum of M138. - Has a proven track record in the production of trapezoidal screws and screws with special shapes. - Can also provide closing devices. ■ Advantages of Rolled Screws 1. Improved screw strength Strength is enhanced due to work hardening from plastic deformation and densification of the structure. 2. Improved surface roughness The surface is varnished and has a glossy finish. 3. Reduced processing time High-speed pitch feeding allows for relatively short processing times for finishing in one go. 4. Reduced setup time The lifespan of rolls is generally longer compared to cutting, which reduces the frequency of tool changes. 5. Prevention of burrs, cracks, and rust The structure becomes stronger due to plastic deformation, significantly reducing the defect rate.

This is a tool that has been used for many years for processing long screws on a general-purpose lathe. It processes by attaching four blades called "chasers" to a holder known as a "die head." One of its features is that the processing time is shorter compared to using threading inserts. Currently, there are no manufacturers of die heads in the country, making them difficult to obtain. Our company handles Coventry-type die heads and chasers. Chasers can be attached to Coventry-type die heads made by OSG or NACHI. *For more details, please refer to the materials. Feel free to contact us with any inquiries.*

**Features** ■ The insert is positioned vertically instead of lying horizontally. In machining hard or sticky materials, it is common for vibrations during processing to cause roughness on the flank surface or the generation of burrs. With-Cut has developed a unique shape that places the insert vertically to solve this problem. ■ We are particular about the finishing of the insert. To emphasize cutting performance, the cutting edge is finished with grinding. Many customers are surprised by the sharpness of the cutting edge at exhibitions, but to ensure that it is sharp yet not prone to chipping, we use carefully selected carbide to achieve both sharpness and durability. ■ We also offer internal coolant holders to further improve chip removal. Internal coolant holders have become quite popular recently. They are now quite common for internal diameter tools and grooving tools, but they have not been widely adopted in threading operations. With-Cut also offers internal coolant specifications for threading tools. *For more details, please refer to the PDF document or feel free to contact us.*

We manufacture high-quality dies for attachment to transfer machines and lathes. ------------------------------ Refil is a specialized manufacturer of racks and dies located in Turin, Italy. Founded in 1963, it has been producing racks and dies for over 50 years. In Europe, it is highly regarded as a manufacturer of high-quality tools, particularly in Germany. **Features of Refil** ■ Utilizes many original processing machines designed and manufactured by its sister company ■ Established an inspection system to ensure a reliable quality assurance system ■ Capable of producing custom items *For more details, please refer to the PDF document or feel free to contact us.*