206results about How to "Improve residual stress" patented technology

Components (1) have a thermal barrier coating (2-6) on the surface thereof, wherein the thermal barrier coating includes at least one layer (3) having chemically stabilized zirconia, and wherein at least indirectly adjacent to the layer (3) with chemically stabilized zirconia and on its surface facing side, there is provided a protective layer (4) and/or a infiltration zone (5) which does not react with environmental contaminant compositions that contain oxides of calcium and which does not react with the material of the layer (3) having chemically stabilized zirconia. Methods for making such components as well as to uses of specific systems for coating thermal barrier coatings, can prevent CMAS.

This invention relates to an electromagnetic progressive shaping method for plate moving coils and a device, in which, said device includes a computer control system, an electromagnetic force generation system and a three-shaft digital control shaping system including a plate clamping elevating device, a supporting model frame and an electromagnetic shaping clamping rod, in which, the computer controls the coil to move downward along the contour of a model profile from the top according to the contour data of the model profile and the plate is formed partly relying on the magnetic force of coil till to the bottom of the model and finish the entire process.

There is provided an improved laser shock hardening method and apparatus which can eliminate spattering of a liquid and waving of the liquid surface upon laser irradiation, and can stably irradiate a workpiece with a laser beam. Thus, the present invention provides in a laser shock hardening method for carrying out surface processing of a workpiece in contact with a liquid by irradiating through the liquid the surface of the workpiece with a pulsed laser beam intermittently emitted from a laser irradiation device, the improvement comprising: providing a solid transparent to the wavelength of the laser, serving as an entrance window to the surface of the liquid; allowing the liquid to be present in the light path of the laser beam between the solid and the surface of the workpiece; and allowing the laser beam to enter through the solid and irradiating through the liquid the surface of the workpiece with the laser beam, thereby shock-hardening the surface of the workpiece.

The present invention relates to a metal cutting insert that is primarily intended for turning operations. The cutting insert comprises an upper surface, a lower surface substantially parallel with the upper surface, and at least three side surfaces extending between the upper and lower surfaces. A transition between two adjacent side surfaces forms a rounded nose radius surface at a cutting insert corner. The cutting insert comprises a peripheral land bridging the upper and side surfaces at least at the corner portion at a chamfer angle. An intersection of the land and the nose radius surface forms a nose cutting edge. The nose cutting edge is defined by at least one radius. The cutting corner comprises at least one curved wiper edge. The chamfer angle in a cross-section at the nose cutting edge is smaller than the chamfer angle in a cross-section a distance away from the nose cutting edge. The chamfer angle has a minimum at a bisector of the corner portion.

A recess-projection fitting structure includes projections extending in an axial direction on an outer diameter surface of a shaft section of an outer joint member or an inner diameter surface of a hole of a hub wheel, press-fitting the projections in another of the outer diameter surface and the inner diameter surface along the axial direction, and forming recesses brought into contact and fitted with the projections by press fitting in the other of the outer diameter surface and the inner diameter surface, the projections and the recesses being held in contact with each other through intermediation. An outer member is fitted in a hole of a knuckle of a vehicle. Annular grooves are formed respectively in an outer peripheral surface of the outer member and an inner peripheral surface of the hole of the knuckle, and a snap ring is engaged with both the annular grooves.

The invention belongs to the technical field of plasma arc spraying, and particularly relates to a high-hardness, high-wear-resistance and high-toughness aluminum oxide ceramic coating and a preparation method thereof. The method comprises the following steps that (1.1) a matrix is selected; (1.2) sand blasting or sanding pretreatment is carried out on the matrix; (1.3) aluminum oxide raw materialpowder is prepared; (1.4) the aluminum oxide nano-sintered powder is heated to a molten state; and (1.5) an aluminum oxide nano-liquid material is sprayed. The core step of the method is the molten step which before the aluminum oxide nano-liquid material is sprayed, a traditional aluminum oxide spraying technology is characterized in that aluminum oxide nano particles are directly placed into aspray gun for heating and spraying, and the combination effect cannot sufficiently meet a strength requirement and an adhesion degree requirement; and the sintered powder is melted into the molten state before feeding by the spray gun through the method, so that the defect is avoided, and the comprehensive parameters of the strength, hardness, toughness and the like of the ceramic coating are obviously better than the effect of a common spraying technology.

A method of restoring a gas turbine engine component includes depositing a filler material onto a sulphidation section of an underside of a turbine engine platform and laser consolidating the filler material to produce a restored surface on the underside. The sulphidation section includes sulphidation pit portions that are filled during the laser consolidating to produce the restored surface. An eroded trailing edge of a turbine airfoil is laser cladded to produce a restored trailing edge thickness.

A surface treatment element having a textured surface with a plurality of deforming features is pressed against the surface of an article to induce deep and shallow layers of compressive residual stress to form a continuous layer of compressive residual stress extending from the surface to a depth beneath the surface. A method whereby a surface treatment apparatus is pressed into the surface of the apparatus to cause Hertzian loading thereby inducing a deep, high magnitude compressive residual stress below the surface. The deforming features of the surface treatment element cause the lateral displacement of material on the surface of the article thereby cold working the surface and providing a more shallow layer of compressive residual stress at the surface.

The invention provides a method of cooling a rail weld zone. The method includes a first rail web portion cooling process of cooling a rail web portion cooling region of the rail weld zone in a part of a temperature range until the completion of transformation from austenite to pearlite, a second rail web portion cooling process of cooling the rail web portion cooling region after the entire rail web portion of the rail weld zone is transformed to pearlite, a foot portion cooling process of cooling a foot portion of the rail weld zone, and a head portion cooling process of cooling a head portion of the rail weld zone. When cooling time of the first and second rail web portion cooling processes is t minute, a k value satisfies an expression represented as −0.1t+0.63≦k≦−0.1t+2.33.

The invention discloses a preparation method of a diamond compact. The method comprises the following steps: arranging a diamond powder layer (2) between a metal alloy plate (1) and a hard alloy substrate (3) to prepare a sintered blank; then putting the sintered blank into the synthesis cavity of a graphite pipe, carrying out warming-pressurizing sintering for 3-30 minutes at 1200-1500 DEG C under the pressure of 5.0-6.0GPa; and cooling and depressurizing the sintered product, thus obtaining the diamond compact. By utilizing the method provided by the invention, the problems that the product prepared in the prior art has poor sintered histology compact uniformity and large residual stress are solved.

A method of the surface treatment of a mold for casting, which comprises subjecting a cavity surface of a fixed mold made by the use of a SCM420 material to first shot peening, a sulfurizing-nitriding treatment and second shot peening. The resulting cavity surface of the fixed mold exhibits a high hardness of 700 or higher in terms of Vickers hardness due to the presence of a sulfurized and nitrided layer, and further has a compression residual stress of more than 1200 Mpa and a largest height, which is a surface roughness value defined by JIS standard, of 8 μm or less.

A method of restoring a gas turbine engine component includes removing a defect section of a turbine engine component according to a template. The template has a standardized shape and is used in a standardized location on the turbine engine component. The template is produced based upon common defect sections from other turbine engine components. A laser cladding is used to build a replacement section in place of the defect section. Thus, the turbine engine component is restored to near its original shape.

An outer race for a rocker bearing includes an internal sliding layer and an external support layer, wherein the sliding layer and the bearing layer are formed from a wound composite fiber material. The outer race is identified by exactly one parting line. A rocker bearing with such an outer race and a method for its production is also provided, in which a sliding layer and a support layer of synthetic resin impregnated fibers are wound in succession onto a winding mandrel, and outer races are formed after setting on the winding body thus produced. The sliding layer and the support layer are wound onto a cylindrical winding mandrel, and the outer race is provided with exactly one parting line opening it, and sliding layer material on its inside is removed to such an extent that a partially spherical contour is obtained for receiving a complementary inner race.

The invention relates to a hard coating and a preparation method thereof. The hard coating comprises multiple low stress layers and multiple high stress layers; the low stress layers and the high stress layers are alternatively formed on a metal matrix. The invention also provides a preparation method of the hard coating. The hard coating and the preparation method thereof of the invention can improve the residual stress distribution in the hard coating, and can increase the film-matrix bonding strength with the proviso that the high hardness and high wear resistance of the hard coating are maintained.

Super-thin float glass consists of SiO2 71.5-72.5wt%, Al2O3 1.3-2.5wt%, Fe2O3 0.04-0.9wt%, CaO 6.0-8.20wt%, MgO 4.3-5.0wt%, K2O 0.5-1.5wt%, and Na2O 11.0-13.4wt%. Its advantages include higher transmittance and elastic modulus, better hardness and quality, and no production defect.

The invention belongs to the technical field of plasma arc spraying and particularly relates to a zirconia ceramic coating with high hardness, wear resistance, toughness and extensibility and a preparation method of the zirconia ceramic coating. The method comprises the following steps: (1.1) selecting a substrate; (1.2) performing sand blast or frosted pretreatment on the substrate; (1.3) preparing zirconia raw material powder; (1.4) heating the sintered zirconia nano-powder to a molten state; (1.5) spraying a liquid zirconia nanomaterial to form the liquid zirconia ceramic coating. The corestep lies in melting before spraying of the liquid zirconia nanomaterial, in the traditional alumina spraying technology, alumina nanoparticles are directly placed into a spray gun for heating spraying, however, a combination effect cannot meet demands for sufficient strength and adhesion. In the method, the sintered powder is molten into the molten state before spray gun charging, the defect is overcome, and comprehensive parameters such as strength, hardness and toughness of the ceramic coating are obviously better than those in the common spraying technology.

The invention relates to a binder, in particular to a binder for extrusion molding of a hard alloy and a preparation method thereof. The binder is made from the following components by weight percentage: 65-80% of paraffin wax, 10-20% of styrene butadiene rubber, 3-5% of dibutyl phthalate, 3-5% of rapeseed oil, 3-5% of stearic acid, and the rest of organic solvents. The preparation method is as follows: the styrene butadiene rubber is dissolved into the organic solvents at normal temperature to prepare a rubber solution for spare use; the paraffin wax is added to a blender and heated to the temperature of 65-75 DEG C for melting, and then added with the dibutyl phthalate, the rapeseed oil, the stearic acid and the rubber solution and stirred for 2-5min to obtain the binder. The binder has the advantages of available and cheap raw materials, simple preparation process, good degreasing and shape retention properties, short degreasing time, improving the production efficiency and saving the production cost.

The invention provides a cold extrusion strengthening method for an assembling hole of a CFRP composite material laminate. The method comprises the following steps: (a) providing a bush, wherein the bush can be assembled in the assembling hole; (b) providing a metal core rod with the taper, and inserting the core rod into the bush; (c) arranging the bush in the assembling hole; (d) applying axial force to the core rod by virtue of extrusion equipment, so that the bush is extruded by the part, with the largest diameter, of the core rod; and (e) removing the core rod, so that the bush is fixedly arranged in the assembling hole. Aiming at the assembling hole of the CFRP composite material laminate, the bush is adopted and is matched with a cold extrusion strengthening process, so that the fatigue life of parts can be effectively prolonged, and the service time of an aircraft is prolonged. Because the bush is fastened in the assembling hole, the wear resistance of the connecting structure is improved, and the detachment of assembling fasteners and the maintenance of the parts can be promoted.

To provide a piston ring having a hard laminate coating for excellent scuffing resistance, wear resistance and peeling resistance, which can be used in an environment of high mechanical and thermal load in engines, the piston ring is provided with a hard laminate coating as thick as 10-60 μm on its outer peripheral surface, the laminate coating being formed by alternately laminating two types or more of layers made of different compounds, each of the compound layers being made of nitride of at least one metal selected from the group consisting of Ti, Cr, Zr, V, Hf and Al.

The present invention is to provide a method for surface treatment that substantially provides no nitride compound layer that causes heat checks and abrasion to a die, while nitride is introduced in large quantities into the die internally, and as a result a die-casting die with excellent heat check resistance and excellent abrasion resistance can be produced. The method comprises a step of a nitriding process for forming on an aesthetic surface of the die-casting die a nitrided layer that includes at least a compound layer composed of a nitrogen compound by introducing gas containing at least ammonia gas to a heating furnace, a step of decomposing the compound by exhausting the ammonia gas from the heating furnace and for introducing ambient gas to the heating furnace, to carry out a thermal process to decompose the nitrogen compound, and a step of processing a shot peening process on the aesthetic surface of the die. The thickness of the compound layer contained in the nitrogen layer that is formed in the step of nitriding process is within the range of from 2∫m to 7∫m.

The invention discloses a device and method for testing the relation between residual stress and surface hardness of a metal component. The device comprises a testing mechanism, a residual stress simulation testing device, a hardness detection module and a monitoring device. The method comprises a method for testing the relation between residual pressure stress and the surface hardness of the metal component and a method for testing the relation between residual tensile stress and the surface hardness of the metal component. The method for testing the relation between the residual pressure stress and the surface hardness of the metal component comprises the following steps: (1) mounting and positioning a tested component; (2) carrying out simulation loading on the residual pressure stress, and acquiring simulation loading capacity of the residual pressure stress and the surface hardness; and (3) acquiring a relation curve between the residual pressure stress and the surface hardness. According to the device and the method, the relation between the residual stress and the surface hardness of the metal component is established so as to provide basis for researching the residual stress of the metal component according to the surface hardness of the metal component.