Last Updated： Aggregation Period:Feb 18, 2026～Mar 17, 2026
This ranking is based on the number of page views on our site.
Last Updated： Aggregation Period:Feb 18, 2026～Mar 17, 2026
This ranking is based on the number of page views on our site.
Last Updated： Aggregation Period:Feb 18, 2026～Mar 17, 2026
This ranking is based on the number of page views on our site.
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High-frequency quenching
Our company aims to improve technology by accumulating a vast amount of processing data, such as the shape of processed items, frequency, and the depth of heat treatment layers, and we will respond to all customer needs, including the creation of custom coils.
Introduction to quenching using high-frequency induction heating, a technology that has been around for a long time and was also used by swordsmiths.
First, "quenching" is a heat treatment technique that involves rapidly heating steel components and then cooling them quickly in water or other mediums, making the components hard and strong. The process of quenching using high-frequency induction heating is called "high-frequency quenching." While hardening steel components can make them brittle, applying quenching only to the surface while leaving flexibility in the interior (maintaining a state where the outside is hard and the inside is soft) can enhance strength. 【Features】 ■ Hardens and strengthens components by rapidly heating steel parts and then cooling them quickly in water or other mediums. ■ Improves strength by applying quenching only to the surface and retaining flexibility in the interior. *For more details, please refer to the PDF document or feel free to contact us. ★ For inquiries by phone, please call: Osaka Headquarters → TEL: 072-991-1361 Nagoya → TEL: 052-322-1361 Tokyo → TEL: 03-5472-1361 *When calling, please mention "Ipros was seen." Operating hours: Monday to Friday, from 9 AM to 5 PM.
Due to the short processing time, the cycle time is also reduced! It is a quenching method that consumes less energy and has excellent controllability.
We would like to introduce the relationship between our high-frequency quenching and other heat treatment methods. High-frequency quenching can be considered an efficient heat treatment method due to its short processing time, resulting in minimal distortion. Because the processing time is short, the cycle time can also be reduced. The equipment cost is comparable to that of nitriding treatment, but it achieves a deeper hardened layer. Additionally, because it consumes less energy, running costs can be saved. 【Features】 ■ Efficient with minimal distortion due to short processing time ■ Reduced cycle time ■ Equipment cost is comparable to nitriding treatment, but achieves a deeper hardened layer ■ Lower energy consumption leads to cost savings ■ Excellent controllability *For more details, please refer to the PDF document or feel free to contact us. ★ For inquiries by phone, please call: Osaka Headquarters → TEL: 072-991-1361 Nagoya → TEL: 052-322-1361 Tokyo → TEL: 03-5472-1361 *When calling, please mention "Ipros" for reference. Operating hours: Monday to Friday, 9 AM to 5 PM.
![[Case Study 4 on Heat Treatment Challenges] A must-see for those struggling with tolerances due to distortion!](https://image.mono.ipros.com/public/product/image/52d/2000748353/IPROS57456753566607215271.png?w=280&h=280)
Control over the total process is necessary for distortion! The factors causing dimensional changes are various.
In recent years, the precision required for parts has become more advanced, and it is not uncommon for tolerances in drawings to be specified at less than a micron. Incorporating dimensional tolerances is a challenge, but when heat treatment is applied, dimensional changes will inevitably occur to some extent. There are various factors involved, but broadly speaking, two main causes can be identified: "dimensional changes due to the release of residual stress" and "dimensional changes due to structural transformation." It would be simple if we could just set a grinding allowance and achieve the dimensions in the final process, but a larger grinding allowance increases the amount of work required, and there are some features, such as knurling or surfaces with subtle angles, that are difficult to correct. Control over distortion requires a total process approach, and our company is engaged in efforts and development to minimize distortion for various parts. In particular, when changing processes from atmospheric treatment to high-frequency quenching, significant effects can be expected. If you are facing issues with distortion, please feel free to consult us. *For more details, please refer to the PDF materials or feel free to contact us.*
We would like to introduce our company's "shaft" processing examples.
【High-Frequency Hardening Case Lineup】 ■ Intermediate Joint High-Frequency Hardening ■ φ150 Shaft High-Frequency Hardening ■ Large Shaft High-Frequency Hardening 【Laser Hardening Case Lineup】 ■ High-Frequency Hardened Shaft Keyway Bottom Laser Hardening ■ Rotating Shaft Laser Hardening ■ Spindle Laser Hardening ■ Small Diameter Ball Screw Keyway Laser Hardening ■ Piston Shaft Laser Hardening ■ Thin-Walled Hollow Bolt Spiral Laser Hardening ■ Large Tapered Roll Laser Hardening 【Laser Cladding Case Lineup】 ■ High-Speed Laser Cladding ■ Shaft with Keyway Laser Cladding ■ Repair Laser Cladding for Shaft with Keyway ■ Center Pin Laser Cladding Repair
We would like to introduce our company's "plate" processing examples.
【High-Frequency Hardening Case Lineup】 ■ L-Shaped Plate High-Frequency Hardening 【Laser Hardening Case Lineup】 ■ Fan-Shaped Plate Laser Hardening ■ L1200×10t Plate Laser Hardening ■ Knurled Surface Laser Hardening ■ Truck Plate Tip Laser Hardening ■ Wide Laser Cladding ■ Drill Hole Laser Cladding Repair
We would like to introduce examples of our "other shapes" processing.
【High-Frequency Hardening Case Lineup】 ■ Gripper Pit High-Frequency Hardening 【Laser Hardening Case Lineup】 ■ Eyebrow Type Piston A Laser Hardening ■ Complex Shape Block Laser Hardening ■ Head Wrench Mounting Part Laser Hardening ■ Convex End Face Laser Hardening ■ Stopper Tip Laser Hardening ■ Taper Cone Outer Circumference Laser Hardening ■ Chuck Raw Jaw Laser Hardening ■ Small Holder Laser Hardening 【Laser Cladding Case Lineup】 ■ Wide Laser Cladding
単品、量産、試作、大型品まで自社製コイルで対応する高周波焼入れ事例集
耐摩耗性、疲れ強さ、じん性の向上を目的とした鋼の表面硬化法として広く活用されている高周波焼入れの事例をご紹介します。 【事例ラインアップ】 ■ヘリカルギヤ一歯移動歯先高周波焼入れ ■Φ720ギヤ歯底一発高周波焼入れ ■L字プレート高周波焼入れ ■中間ジョイント高周波焼入れ ■スピンドルインターナルギヤ高周波焼入れ ■リングガイドウェイ高周波焼入れ ■ウォーム軸一歯回転高周波焼入れ ■φ150シャフト高周波焼入れ ■大型レバー高周波焼入れ ■ラックギヤ高周波焼入れ ■グリッパーピット高周波焼入れ ■大型シャフト高周波焼入れ ■大型リング溝高周波焼入れ
We can accommodate special shapes as we have a large number of coils!
【Conventional Issues】 We were requested to respond to a very short delivery time for high-frequency hardening of single-unit helical gears. Due to the nature of single-unit helical gears, it was necessary to manufacture coils urgently. 【Response from Fuji High Frequency】 We have thousands of types of coils tailored to various modules, and even if there is no coil that fits the shape, we can quickly make adjustments in-house. We were able to meet the delivery time within one and a half days. 【Specifications】 Dimensions: M18×80T×340W×φ1440 Material: SCM435 Depth: 2.0mm or more at PCD Hardness: Hs65–75
Powerful heat treatment! Instant high-frequency hardening!
【Conventional Issues】 Until now, due to the material being S45C, one-tooth induction hardening was performed, which took about 5 hours for high-frequency heat treatment. To reduce heat treatment costs, a change in material was proposed (S45C ⇒ SCM440). 【Response from Fuji High Frequency】 With our 600KW high-frequency oscillator, it is now possible to perform one-shot hardening down to the tooth base, reducing the heat treatment time from the conventional 5 hours to 0.5 hours, leading to a reduction in heat treatment costs. 【Specifications】 Dimensions: M12 × 60T × 250W × φ720 Material: SCM440 Hardness: Hs60–70
High-frequency hardening can be done with internal gears!
【Conventional Issues】 When carburizing and quenching, unnecessary parts become hard, making post-processing difficult. Additionally, even when selecting high-frequency single-shot quenching to reduce costs and lead times in heat treatment, significant distortion occurs. 【Response from Fuji High Frequency】 To address these issues, we performed surface hardening of one tooth of the internal gear. By not hardening unnecessary parts, post-processing became easier, and sufficient hardened layer depth was achieved. 【Specifications】 Dimensions: MP8×100W×385L Material: S45C Hardness: Hs65 Depth: Over 2mm
It is high-frequency hardening, an essential component for line equipment!
【Conventional Issues】 It was a high-frequency hardening project for the V-shaped surface of the ring's outer circumference with a short delivery time. However, due to the special shape of the hardened area, it was necessary to quickly manufacture a coil that matched the V shape. 【Response from Fuji High Frequency】 Since we manufacture coils in-house, we can produce coils and perform hardening within one and a half days. Additionally, using our long-standing expertise in bearing hardening, we can achieve low-distortion hardening through high-frequency moving hardening. 【Specifications】 Material: SUS440C Hardness: HRC55 Depth: 2.0mm or more Size: φ1109×24W
Our high-frequency hardening equipment can accommodate shafts up to 4 meters in length!
【Background】 In the high-frequency hardening of a large shaft with an outer diameter of φ150 and a length of L1700, there was a request for a hardened layer depth of 3mm and to minimize distortion as much as possible after hardening. 【Response from Fuji High Frequency】 By using our unique shaft hardening method and applying high-frequency hardening, we achieved both the occurrence of distortion and a deep hardened layer depth. Additionally, this equipment can accommodate vertical hardening up to 4m. 【Specifications】 Material: S45C Hardness: HRC58 Depth: 2mm Size: φ150×L1700
It is possible to perform high-frequency hardening on levers larger than those of a person!
【Background】 In partial quenching of large, specially shaped products, it is necessary to manufacture special-shaped coils to perform high-frequency treatment according to the drawings. Additionally, a large high-frequency quenching machine capable of handling this quenching is also required. 【Fujikou High Frequency's Response】 Our company manufactures coils in-house, so we can produce such special-shaped coils with short lead times and low costs. We also specialize in large products, and if the project can fit within our factory, we can almost always accommodate the quenching. 【Specifications】 Material: S45C Hardness: HRC58 Depth: 3mm
We have a high-frequency oscillator with high output capacity, so large-sized workpieces can also be subjected to high-frequency hardening!
【Background】 To perform induction hardening on a shaft with an outer diameter of φ940, a high-frequency oscillator with a large output capacity is necessary. This limits the number of companies capable of doing so even within the country. 【Response from Fuji High Frequency】 Using a large high-frequency oscillator of 6KHz×600KW makes it possible to perform induction hardening on large shafts with an outer diameter of φ940. Additionally, since a deep hardened layer is required, the frequency of 6KHz becomes important. 【Specifications】 Dimensions: φ940×850L Material: S45C Hardness: HRC58 Depth: 5mm
I won't say "I can't" because I have a track record of continuing to take on challenges!
Toyo High Frequency Industry is dedicated to high-frequency hardening and has honed its technical skills. With 35 years of rich experience and achievements, we showcase the capabilities unique to a company specializing in high-frequency hardening. We welcome difficult materials, complex shapes, and parts that others say are impossible. Each piece is approached with serious commitment through daily technical ingenuity, which has allowed us to acquire valuable know-how. Whether it's materials that seem likely to crack after high-frequency hardening or super-large parts that need to be finished in just one day, we do not say no when others do. While this sometimes involves risks, we strive to meet your requests to the best of our ability, which is the compliance of Toyo High Frequency Industry. The technical skills we have cultivated become our greatest weapon: "confidence." 【Features】 - Led by a master craftsman president, we gladly accept technical consultations. - We receive requests from all over the country, expecting high technical skills and proposal capabilities. - Honest pricing. - The shortest delivery time possible: "same-day delivery" is achievable. → This is made possible because we produce 100% of our work coils in-house. For more details, please contact us or download our catalog.
Localized hardening is possible! The surface of the material is hardened while maintaining toughness in the internal material.
A technical group capable of meeting all processing requests for jigs, tools, and processed parts. We would like to introduce Thermic's "technology and products." Our company offers high-frequency hardening, which allows for localized hardening, hardening the surface of the material while maintaining toughness in the internal material. We can accommodate lot sizes from 1 to 100 pieces. 【Features】 ■ High-frequency hardening ■ Localized hardening is possible ■ Hardens the surface of the material ■ Maintains toughness in the internal material *For more details, please feel free to contact us.
High-frequency hardening available in Wakayama Prefecture.
In Wakayama Prefecture, we conduct high-frequency hardening in-house, which is rare. We can accommodate both single items and batch orders, and we also adjust delivery times according to customer requests. We can issue hardness certification inspection reports, so please feel free to consult us when needed.
Rapid heating and cooling create significant compressive residual stress, enhancing fatigue strength! Introducing heat treatment that does not use fire.
"High-frequency hardening" utilizes high-frequency induction heating to rapidly heat the surface of the workpiece to the hardening temperature, followed by rapid cooling, creating a hardened layer on the surface that improves wear resistance and enhances mechanical properties. Localized heating allows for relatively easy selection of the depth of the hardened layer based on frequency. Direct heating results in good thermal efficiency and shorter working times. Please feel free to contact us when you need our services. 【Features】 ■ Good thermal efficiency and shorter working time due to direct heating ■ Localized heating allows for relatively easy selection of hardened layer depth based on frequency ■ Rapid heating and cooling processes result in minimal oxidation, decarburization, and deformation ■ Rapid heating and cooling generate significant compressive residual stress, improving fatigue strength ■ High surface hardness provides excellent wear resistance ■ Standardization and automation of work processes are easy *For more details, please refer to the related links or feel free to contact us.
We will also perform distortion correction after firing!
Our company performs high-frequency hardening. The target components are industrial equipment parts (especially in the automotive-related industry). We generally do not have restrictions on the shape or size of the parts. Additionally, for customers who wish, we can act as a point of contact for "overall hardening," "carburizing hardening," "vacuum hardening," and "nitriding treatment." Please feel free to contact us with your requests. 【Features】 ■ Generally, there are no restrictions on shape or size (For complex shapes, special materials, long items, and heavy parts, please consult us separately) ■ We accept orders starting from one piece *For more details, please download the PDF or feel free to contact us.
Partial hardening is possible! The structure is fine, resulting in excellent ductility, toughness, and fatigue strength.
"High-frequency quenching" is a process that involves rapidly heating the surface layer, allowing carbon to dissolve into the base material, maintaining a diffusion holding time of about 1 second, and then spraying a quenching agent to perform surface hardening. This treatment is applied to quenching steels containing more than 0.25% carbon, but generally, low alloy steels such as carbon steels with about 0.4 to 0.5% carbon or Cr-Mo steels with less than 0.4% carbon are commonly used. Please feel free to contact us if you have any requests. 【Features】 ■ Partial hardening is possible ■ High surface hardness, excellent wear resistance, and fatigue strength are achieved ■ High compressive stress on the surface results in excellent fatigue strength ■ Fine microstructure provides excellent ductility, toughness, and fatigue strength ■ The uneven distribution of carbon and alloying elements before hardening tends to reflect in the hardened structure and properties *For more details, please refer to the PDF document or feel free to contact us.
This is a steel material that achieves multiple strengths with a single bar of steel. High-frequency quenching allows for only the areas that require high strength and high durability to be treated with high strength.
In conventional heat treatment using furnaces, it was difficult to apply heat to only the necessary parts of the steel material, as heat was applied to the entire steel. However, by utilizing high-frequency induction heating (IH) to selectively high-frequency quench only a portion of the steel (enhancing strength and durability), multiple strengths have been achieved with a single steel rod. By placing high-strength sections in areas where the integrity of structures and components must be ensured, and low-strength sections in other areas, damage control and reduction of materials are possible. Using this technology and product, we have started selling high-strength rebar placed in column and beam joints that contribute to damage control of structures, reduction of rebar quantity, improved workability, and comfortable living spaces, named "Double Stark®." *In 2018, we received the "Super" Monozukuri Parts Award and the Lifestyle-Related Parts Award.
Taft Ride
Also known as salt bath nitriding, it uses a salt bath agent primarily composed of cyanate, allowing for nitriding and carburizing to be performed in a short time (0.5 to 3 hours) compared to gas nitriding.
In the current automotive industry, where miniaturization and weight reduction of components are required, hardening is an indispensable technology!
We will introduce why heat treatment is necessary and the benefits of quenching. First, one benefit is that quenching allows for the miniaturization and weight reduction of parts. Even small components can achieve strength equivalent to larger parts by increasing their strength through heat treatment, enabling miniaturization and weight reduction. The second benefit is the reduction of material costs. By applying quenching, it is possible to obtain strength equivalent to that of expensive materials even when using common materials. 【Features】 - Enables miniaturization and weight reduction of parts - Achieves strength equivalent to larger parts when strength is increased through heat treatment - An indispensable technology in the current automotive industry, where miniaturization and weight reduction are required - Reduces material costs - Achieves strength equivalent to expensive materials even when using common materials *For more details, please refer to the PDF document or feel free to contact us.
Improving cutting performance, fatigue strength, and wear resistance! Introducing the purpose of heat treatment.
We will introduce the reasons why heat treatment is necessary and the purpose of quenching. The first reason is improved sharpness. By applying quenching only to the cutting edge, the strength of the cutting edge increases. Next, there is an improvement in fatigue strength. In today's demand for lightweight components and longer product lifespans, this fatigue strength is being emphasized. Finally, there is an enhancement in wear resistance. By applying high-frequency quenching to harden the surface, we can prevent wear on components and improve wear resistance. 【Objectives】 ■ Improved sharpness ■ Improved fatigue strength ■ Enhanced wear resistance *For more details, please refer to the PDF document or feel free to contact us. ★ For inquiries by phone, please call: Osaka Headquarters → TEL: 072-991-1361 Nagoya → TEL: 052-322-1361 Tokyo → TEL: 03-5472-1361 *When calling, please mention that you saw this on "Ipros." Operating hours: Monday to Friday, from 9 AM to 5 PM.
We would like to introduce our company's gear processing examples.
【High-Frequency Hardening Case Lineup】 ■ Helical Gear Single Tooth Movement High-Frequency Hardening ■ Φ720 Gear Tooth Base Single Shot High-Frequency Hardening ■ Spindle Internal Gear High-Frequency Hardening ■ Worm Shaft Single Tooth Rotational High-Frequency Hardening ■ Rack Gear High-Frequency Hardening 【Laser Hardening Case Lineup】 ■ M1 Gear Single Tooth Single Shot Laser Hardening ■ M1.5 Small Gear Tooth Surface Movement Laser Hardening ■ Ring Gear Laser Hardening ■ M2 Rack Gear Laser Hardening ■ Spiral Bevel Gear Tooth Surface Laser Hardening
We would like to introduce our company's "ring" processing examples.
【High-Frequency Hardening Case Lineup】 ■ Ring Guideway High-Frequency Hardening 【Laser Hardening Case Lineup】 ■ Large Ring Groove High-Frequency Hardening ■ Soft Zone Countermeasures with Laser Hardening ■ Ring V Groove Laser Hardening ■ Thin-Walled V Ring Laser Hardening
We would like to introduce our company's "rail" processing examples.
【High-Frequency Hardening Case Lineup】 ■ Ring Guideway High-Frequency Hardening 【Laser Hardening Case Lineup】 ■ 100mm Width Laser Hardening ■ L1200×10t Plate Laser Hardening ■ Laser Hardening of Rails with Small Diameter Holes
For high-frequency quenching and laser quenching, contact Fuji High-Frequency Industry, a specialized manufacturer of high-frequency heat treatment.
Our company's business is centered around two pillars: high-frequency hardening and laser hardening. In the high-frequency division, we provide quality, delivery, and cost that satisfy our customers, backed by over 60 years of technical expertise since our founding. Additionally, the laser division utilizes skilled laser technicians and the latest laser equipment to offer cutting-edge surface processing technologies such as laser hardening and laser cladding. To uphold our management philosophy of "being a company that is needed by society," we aim to remain a company that can adapt to changes and develop businesses that align with the times. We will work together as a company to meet our customers' needs. We kindly ask for your continued support and consideration in the future.
From single items to mass production, prototypes, and large products, we handle everything with our in-house coils. For "high-frequency hardening," leave it to us!
Since our establishment in 1956, we have accumulated high-frequency technology. We manufacture coils in-house even for complex shapes, responding with short lead times and low costs. We possess a variety of outputs and frequency ranges from low frequency to high frequency, accommodating everything from small-batch, diverse products to mass production. We offer optimal partial hardening solutions for our customers using two partial hardening technologies: high-frequency hardening and laser hardening. 【High-Frequency Hardening Equipment】 - Number of units: 10 units, 50Kw to 600Kw, 6 to 200KHz - Usable size: up to 5,000kg, up to φ6,000, up to L6,000mm - Production lot: 1 to 200,000 pieces/month
