Jiangsu Ruizhifeng Engineering Tools Co., Ltd, formerly known as Dongtai Shiping Hardware Tools Co., Ltd., was established in 2006, now mainly produces high-speed tool steel and tunnel engineering shield machine tools. As a new product developed in recent years, projects of all kinds of accessory tool items have been established with the idea of giving priority to quality and catching up with the advanced level at home and abroad. After entering the market, the products has successfully entered a number of tunnel engineering in China and gained good reputation.
All kinds of hob parts produced by our company are made of domestic high-quality low alloy carbon steel and have good comprehensive mechanical properties by adopting reasonable heat treatment process.
Using self - developed high quality materials, the knife ring produced by our company leads the domestic counterparts and achieves international standards. Its HRC is 56 to 58 after a special process treatment, and the impact energy value detected by National Steel Yannake Testing Center is up to 40 J (internationally recognized), and the impact power of domestic products of the same trade generally 24 to 30J. Therefore, our cutters have the characteristics of good impact resistance, high hardness, good wear resistance and long service life. Our company will choose different types of cutter rings for different strata to meet the needs of customers. After trial application, 750 rings have been drilled in the complex stratum of Guangzhou, Qingdao and Fuzhou, and the wear of the rings is superior to that of domestic counterparts.
● Bearings: TIMKEN Corp.
● Floating seal:Trelleborg
● Floating seal seat, left and right end cap material: 40CrNiMoA HRC36 ± 3
● Mandrel material: 40CrNiMoA HRC42 ± 3
● Oil type: Shell SHEL460
Forgings are made by the closed die method as Germany. Subsequent processing consisting of two machining steps and four heat treatment steps are completed in China.
The steel manufacturing processes are designed to keep impurities to the lowest.Melting in an Electric Arc Furnace is followed by vacuum degassing. Ingot molds are filled from the bottom with the liquid steel shrouded in argon gas. Exceptionally clean steel ensures high resistance to fatigue, resulting in longer cutter disc life
Carburized and case-hardened, uses Timken tapered roller bearings that outperform other bearings in dynamically loaded conditions and harsh environments. During assembly, the bearings are pre-loaded to effectively excavate hard rock in the most severe operating conditions.
Durable metal-to-metal face seals eliminate ingress of foreign materials while silicone torics maintain elasticity even at high temperatures.
The patented compensation retainer has a superior piston design with a much larger surface area than other cutter manufacturers. The outer surfaces are carburized and case-hardened for extended life in harsh conditions.
Made of durable alloy steel, hubs are furnace heat-treated, quenched, and tempered for toughness. The disc-mounting surface is further induction hardened and finished by grinding.
shafts are made of the same alloy steel as the hubs, and go through an identical process of heat-treatment, quenching, and tempering. They are additionally gas nitride for surface hardness
All types of finished products of cutting rings: Standard cutter ring, heavy cutter ring, arc cutter ring, surface automatic surfacing wear-resistant welding cutting ring, bal-tooth cutting ring, insert cutter ring, etc