43results about How to "Good thermal hardness" patented technology

The embodiment of the invention provides a zinc alloy for manufacturing a die. The zinc alloy comprises the following components in percentage by weight: 5 to 22 percent of aluminum (Al), 0.005 to 0.03 percent of magnesium (Mg), 1 to 10 percent of copper (Cu), 0.05 to 0.5 percent of rare earth, 0.01 to 0.05 percent of boron (B), 0.05 to 0.2 percent of titanium (Ti), 0.05 to 0.2 percent of manganese (Mn) and the balance of zinc (Zn), wherein the weight percent sum of the components is 100 percent. The Al is an important element of the zinc alloy, and has good heat resistance and casting property. The Cu is an important enhancing element in the zinc alloy, the Cu and the Zn can form a CuZn3 metal compound, and the Cu can improve the strength and plasticity of the zinc alloy. The Mg, Re, B, Ti, Mn and the like serving as trace additive elements can play a role in thinning crystal grains and reducing component segregation and 'bottom shrinkage' phenomenon. The hardness and abrasion resistance are further improved; and on the premise of ensuring that the tensile strength is basically not changed, the dimensional stability, die making precision, corrosion resistance and the like of the alloy are obviously improved.

A high-speed steel for high-strength and wear-resistant cutters is composed of, by weight, 1.2-1.6% of C, 0.55-0.85% of Si, 1.10-1.30% of Mn, 5.50-6.50% of Cr, 3.40-4.40% of Mo, 1.05-1.15% of V, 0.50-0.70% of Nb, 0.02-0.04% of Ti, 1.60-1.90% of W, 0.03-0.05% of Re, 0.0008-0.003% of B, 0.05-0.09% of N, P smaller than or equal to 0.015%, S smaller than or equal to 0.015% and the balance Fe and inevitable impurities. The high-speed steel is high in strength, good in wear resistance, thermal hardness and machinability and low in production cost.

The invention discloses a highly stable and friction-resistant train brake disc. The raw materials and proportions thereof are as follows: C: 0.10-0.22%; Ti: 0.21-0.31%; Mn: 0.37-1.21%; V: 0.05-0.15%; Cr: 1.46~3.77%; W: 0.34~1.77%; Mo: 0.65~0.98%; Cu: 0.50~0.80%; P: <0.005%; S: <0.005%; Nb: 2.01~3.78%; quantity. The invention also discloses a preparation method of a highly stable friction-resistant train brake disc. The brake disc of the present invention has low-temperature strength and toughness, and still maintains good friction coefficient stability under the temperature span of +20°C to -60°C, so the brake disc is suitable for long-distance and ambient temperature applications in the north-south region High-speed trains run between areas with large differences.

The invention relates to a hot roller laser restoration method allowing a restored surface to have good wear resistance. A transition alloy layer, a middle alloy layer and a surface alloy layer are cladded with laser layer by layer from the inside on the surface of a hot roller. Alloy powder adopted by the transition alloy layer includes components by mass: 0.31-0.35% of C, 3.2-3.6% of Si, 1.2-1.8% of B, 2.2-2.6% of Fe, and 7-8% of Cr, with the balance being Ni. Alloy powder adopted by the middle alloy layer includes components by mass: 0.4-0.5 % of C, 3.8-4.3% of Si, 12-13% of B, 2.5-3.2% of Fe, and 10-12% of Cr, with the balance being Ni. Alloy powder adopted by the surface alloy layer includes components by mass: 0.05-0.1% of C, 3.2-3.6% of Si, 2-4% of Fe, 16-19% of Cr and 27-30% of Mo, with the balance being Co. The surface of the hot roller restored by the method has good wear resistance, corrosion resistance and hot hardness, both toughness and strength of the inside of the hot roller are taken into account, and laser cladding effects are good.

The invention discloses a dry-point silicon nitride electric heating element and a manufacturing method. The dry-point silicon nitride electric heating element consists of a heating source and a heating body. The heating body comprises the following components: by weight percentage, 85-96% of nanometer silicon nitride, 1-4% of aluminum oxide and 4-8% of yttria, and is formed by preparing the components, making biscuit and sintering and the like. The dry-point silicon nitride electric heating element is resistant to high temperature and corrosion and excellent in thermohardening and wear resistance and can work for long time at the temperature within 1200 DEG C.

The invention provides a machining method of a rotor root blade locking window provided with threads, and relates to the field of steam turbines. By adoption of the machining method, the problems that according to an existing rotor root blade locking window provided with threads, due to the fact that a mounting window is a rhombic window, two parts of semi-sectioned threads need to be machined on the blade locking window, and the structure is complex; and in the machining process, the machining difficulty is high, the precision is low, the machining time is long, and the efficiency is low are solved. The machining method of the rotor root blade locking window provided with the threads comprises the steps that firstly, a rotor is mounted and aligned; secondly, the contour of the T-shaped root blade locking window of the rotor is roughly machined through a first vertical milling tool; thirdly, the T-shaped root blade locking window of the rotor is fine machined through a second vertical milling tool; fourthly, bottom holes of T-shaped root blade half-thread holes of the rotor are machined through a third vertical milling tool; fifthly, the bottom relief part of the T-shaped root blade locking window of the rotor is machined through a fourth milling tool; and sixthly, half-thread holes of the T-shaped root blade locking window of the rotor are machined through a thread milling tool. The machining method is used for machining the rotor root blade locking window provided with the threads.

The invention discloses a gear cleaning device for a gear roller of a titanium sponge single roller crusher. The device mainly consists of the gear roller (1), a housing case (2) and a gear cleaning knife (3); the gear cleaning knife (3) is fixed at one side of the gear roller (1) of the crusher and is positioned oppositely to a jaw plate; a gap between the knife edge of the gear cleaning knife (3) and gear spaces of the gear roller (1) is adjustable; when the crusher is in work, the gear roller (1) rotates to squeeze with the jaw plate for cutting titanium sponge; and at the same time, the gear cleaning knife (3) picks out the titanium sponge on the gear roller (1), and the principle is similar to the process of metal-cutting. The gear cleaning device provided by the invention has the technical effects that no additional power source or transmission mechanism are needed, and a gear can be cleaned by utilizing the self-power of the crusher; the gear cleaning knife structure is of a combined type, so that the cost is low; gaps between gears can be adjusted according to a practical application situation, so that the capability of cleaning the gear is improved; the gear cleaning knife head is good in thermohardening property and high in strength; and the knife edge of the knife head is additionally provided with a rake angle and a relief angle, so that the force for cleaning the gear is reduced, and the friction is reduced.

The invention relates to a wear-resistant and abrasion-resistant and a preparation process for forming a protective coating on a working surface of a mould substrate. The wear-resistant and abrasion-resistant mould is provided with a substrate which is made of an iron-based material, and the working surface of the substrate is provided with a nanometer titanium aluminum nitrogen (TiAlN) coating which is prepared in a preset powder or synchronously-fed laser smelting and coating way and is combined with the working surface of the substrate in a metallurgical form. The preparation process for forming the protective coating on the working surface of the mould substrate comprises steps of: (1) pre-treating mould substrate; and (2) laser cladding. According to the wear-resistant and abrasion-resistant mould and the preparation process, the technical problems of the existing ion nitrogenization plus physical vapor deposition process for depositing a metal ceramic hard coating on a mould that a complicated surface or a large-size mould cannot be processed, the coating adhesion is required to further improve and the production equipment and production process are complicated can be solved.

A high-speed steel for high-strength and wear-resistant cutters is composed of, by weight, 1.2-1.6% of C, 0.55-0.85% of Si, 1.10-1.30% of Mn, 5.50-6.50% of Cr, 3.40-4.40% of Mo, 1.05-1.15% of V, 0.50-0.70% of Nb, 0.02-0.04% of Ti, 1.60-1.90% of W, 0.03-0.05% of Re, 0.0008-0.003% of B, 0.05-0.09% of N, P smaller than or equal to 0.015%, S smaller than or equal to 0.015% and the balance Fe and inevitable impurities. The high-speed steel is high in strength, good in wear resistance, thermal hardness and machinability and low in production cost.