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124results about How to "High surface hardness" patented technology

Process for manufacturing cold-rolled/cold-drawn precise welded steel pipe

The invention discloses a process for manufacturing a cold-rolled/cold-drawn precise welded steel pipe. The process comprises the following steps of: 1) feeding; 2) slitting; 3) processing the welded pipe; 4) deoiling and degreasing the finished product welded pipe at high temperature and washing at high temperature; 5) performing non-oxidation annealing on the welded pipe which is deoiled and degreased at high temperature; 6) pinching the head of the annealed welded pipe, and dipping the annealed welded pipe in rolling/drawing lubricating oil; 7) performing cold rolling/cold drawing on the welded pipe by using a cold rolling/cold drawing mill; and 8) comprehensively inspecting, packaging and putting in storage. By a cold rolling or cold drawing process, compact hardened films are formed on inner and outer surfaces of a pipe body through extrusion, the tensile strength, the surface hardness and the wear resistance of the steel pipe are improved obviously, and the application range of the steel pipe is widened. Meanwhile, by applying the non-oxidation annealing process, the processes of scouring, phosphorization and water and oil removing are eliminated, the process is shortened, the material and energy consumption in the technological process is reduced, the working efficiency is improved, and cost is reduced.
Owner:JIANGU DOM PIPE LTD

Novel material of piston of breaking hammer and manufacturing process of piston

InactiveCN102796964AHigh surface hardnessSolve low hardnessPistonTungsten
The invention discloses a novel material of a piston of a breaking hammer and a manufacturing process of the piston, belonging to the technical field of breaking hammers. The novel material is 18Cr2Ni4WA and comprises the following chemical components: 0.13-0.19% of carbon C, 0.17-0.37% of silicon Si, 0.30-0.60% of manganese Mn, not more than 0.025% of allowable residual content of sulfur S, not more than 0.025% of allowable residual content of phosphorus P, 1.35-1.65% of chromium Cr, 4.00-4.50% of nickel Ni, not more than 0.025% of allowable residual content of copper Cu, 0.80-1.20% of tungsten W and the balance of iron. The manufacturing process of the piston of the breaking hammer comprises steps of forging, normalizing and high-temperature tempering, machining, carburizing and quenching, subzero treatment, low-temperature tempering and finish machining. The piston of the breaking hammer, which is manufactured according to the method provided by the invention, is high in hardness and has better tensile property and the like than similar products in China; the problems that pistons of breaking hammers available in market are low in hardness and likely to be strained are solved; and the piston manufactured according to the method provided by the invention further has the advantages of low cost and good economical efficiency.
Owner:JIANGSU LIBOSHI MACHINERY

High strength low alloy wear resistance steel plate and preparation method thereof

The invention relates to high strength low alloy wear resistance steel plate and a preparation method thereof. The steel comprises the following chemical compositions by weight percent: 0.18-0.22% of C, 0.2-0.5% of Si, 1.0-1.6% of Mn, 0.010% or less of P, 0.005% or less of S, 0.02-0.03% of Al, 0.016-0.022% of Ti, 0.16-0.20% of Cr, 0.0005-0.0015% of B and the balance Fe and inevitable impurities. The carbon equivalent (Ceq) is equal to 0.5% or less than 0.5%, while Ceq (%) = C + Mn/6 + Si/24 + Ni/40+ Cr/5 + Mo/4 + V/14. The preparation method of the steel plate comprises the process of preparing ultra-pure steel, and the preparation method is characterized in that the specific parameters are controlled as follows: the plate blank is heated to the temperature range of 1180-1200 DEG C, the heating time is not less than 150min; the screw-down rate for rolling each pass is 15-30%, the accumulated screw-down rate is not less than 70%, the starting temperature of hot rolling is 1050-1100 DEG C, the finishing temperature is above 950 DEG C; and the heat treatment is performed after the steel plate is rolled and the heat treatment comprises quenching and low temperature tempering steps, wherein the quenching conditions are that the steel plate is heated to the temperature range of 910-950 DEG C and the holding time is 3min/mm and the tempering conditions are that the steel plate is heated to 250 DEG C and the holding time is 2.5min/mm. The method of the invention can increase the wear resistance, welding performance, strength and hardness, simplify production process and reduce cost of steel plates.
Owner:NORTHEASTERN UNIV

Chain tensioner

ActiveUS20090017949A1Minimize formationHigh surface hardnessGearingOil supplyCheck valve
A chain tensioner includes a plunger axially slidably inserted in the cylinder for pressing a chain. The plunger defines in the cylinder a pressure chamber filled with hydraulic oil. The volume of the pressure chamber is variable with the axial movement of the plunger. The pressure chamber communicates with the outside of the cylinder through a restricted passage defined between sliding surfaces of the plunger and the cylinder. A spring biases the plunger in a direction to increase the volume of the pressure chamber. The cylinder is formed with an oil supply passage through which the pressure chamber communicates with the outside of the cylinder. The chain tensioner further includes a check valve which allows only a flow of hydraulic oil through the oil supply passage from the outside of the cylinder to the pressure chamber. The check valve includes an annular valve seat, a check ball which is movable into and out of contact with the valve seat, and a retainer formed by drawing and retaining the check ball. The retainer includes a tubular portion and a bottom at one end of the tubular portion. The tubular portion of the retainer is formed with an opening through which hydraulic oil can flow into and out of the retainer. The opening extends to a border between the tubular portion and the bottom of the retainer and is formed by punching the tubular portion from inside to outside thereof.
Owner:NTN CORP

Intelligent window and manufacturing method thereof

The invention relates to the technical field of windows, and provides a manufacturing method for manufacturing an intelligent window. The method includes the steps that dyeing, stretching and color complementing are conducted on a first polyvinyl alcohol film, and the upper surface and the lower surface of the first polyvinyl alcohol film are covered by first triacetyl cellulose membranes to be dried; dyeing, stretching and color complementing are conducted on a second polyvinyl alcohol film, the upper surface and the lower surface of the polyvinyl alcohol film are covered by a third triacetyl cellulose membrane and a second triacetyl cellulose membrane to be dried, the second triacetyl cellulose membrane is coated with a pressure-sensitive adhesive layer, and then thermocuring and spontaneous curing are conducted; first glass, a first polaroid, a liquid crystal coating, a second polaroid and second glass are sequentially stacked. The invention further provides the intelligent window. The intelligent window comprises the first glass, the first polaroid, the liquid crystal coating, the second polaroid and the second glass. The first polaroid comprises the first polyvinyl alcohol film and the first triacetyl cellulose membrane. The second polaroid comprises the pressure-sensitive adhesive layer, the second triacetyl cellulose membrane, the second polyvinyl alcohol film and the third triacetyl cellulose membrane.
Owner:SHENZHEN SUNNYPOL OPTOELECTRONICS

Machining technology for internal gear of precision planetary reducer with small tooth difference

ActiveCN106825775AHigh surface hardnessRefining carrying capacityGear teethSmall teethCarrying capacity
The invention discloses a machining technology for an internal gear of a precision planetary reducer with the small tooth difference. The internal gear integrates the prominent features of an internal gear which is provided with a supporting bearing outer raceway and an arc containing groove as the hard tooth surface. The machining technology includes the steps that A, material selection is performed, and a blank is forged; B heat treatment is conducted; C, rough turning of an outer circle and an end face is carried out, and the outer circle is used as the datum to machine an inner hole and a bearing raceway; D, the arc containing groove is subjected to gear shaping machining; E, the raceway and the arc containing grove are subjected to quench hardening treatment; F, an inner circle, the outer circle and the end face are coarsely ground, and the bearing raceway is used as the datum to coarsely grind the arc containing groove; G, heat treatment is conducted again; H, the outer circle and the end face are accurately ground; and I, the bearing raceway and the arc containing groove are also accurately ground. By the adoption of the machining technology, the bearing raceway and the arc containing groove are machined using the same datum, so that machining precision is guaranteed, installation errors are reduced, and the high-precision requirement of the reducer is met; and due to the fact that the bearing raceway and the arc containing grove are subjected to quench hardening treatment, precision retaining ability and carrying capacity of the precision reducer are improved.
Owner:CHONGQING UNIV +1
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