145results about How to "Avoid crack phenomenon" patented technology

The invention relates to a laser three-dimensional forming method of large-size titanium-aluminum-based alloy. According to the method, a three-dimensional model of the titanium-aluminum-based alloy is established first, subdivision is carried out, then a fusion covering control program is compiled; the scanning speed of a powder feeding nozzle is controlled to be 100-200m/h, powder feeding speed is set to be 5-8g/min, the subdivision height of each layer is 0.1-0.2mm, 5-10 layers cover a base plate in a fusion mode, a base fusion covering layer is formed; the scanning speed of the powder feeding nozzle is adjusted to be 200-300m/h, the powder feeding speed of a powder feeding system is adjusted to be 6-10g/min, the subdivision height of each layer is adjusted to be 0.4-0.6mm, and even and stable forming is carried out until the forming process is over. The method can solve the problem that cracks can be generated easily during a titanium-aluminum-based alloy fusion covering process, and large-size crack-less titanium-aluminum-based alloy materials can be manufactured.

The invention relates to an antenna housing and provided a combined antenna housing. The combined antenna housing comprises an arc-shaped housing body (1) and a steel base (2) in a hollow cylindrical structure, wherein the steel base (2) is located on the lower portion of the arc-shaped housing body (1), and the arc-shaped housing body is in a sandwiched composite structure. Compared with existing products, the combined antenna housing has the advantages of being good in electromagnetic permeability and high and low temperature shock resistance and capable of protecting antennas to be used in severe weather such as sand, high wind and humid rainy climate and in regions with large temperature differences.

A high voltage hollow composite insulator of diameter variable type is prepared as sticking end connection pieces firmly at two ends of winding tube, setting a unified structure of umbrella body at external of winding tube, setting said winding tube to be tube body in variable diameter, using high temperature silicon sulfide rubber to form a unified structure of umbrella body by injection forming process.

The invention discloses a method for processing a rectangular-tooth spline sleeve using 42CrMoE high-quality alloy steel as a material, belonging to the technical field of thermal treatment. The method comprises the steps of: free forging of a blank, normalizing treatment, rough turning, hardening and tempering thermal treatment, finish turning, spline drawing, drilling, burr gripping, carburization treatment, surface deposition treatment, phosphorylation treatment, electroplating, drying and detection. In the invention, due to the new material and new technology, the wear resistance of the produced rectangular-tooth spline sleeve is greatly enhanced, the phenomenon of crack of the rectangular-tooth spline sleeve is avoided, the surface is smooth, the friction is low, the heat dissipation is good, and the service life is prolonged, thus the processing technology is widely applied.

The invention discloses a light-cured resin based ceramic composite material capable of providing the bright and clean contour of a formed part and a blank degreasing method of a ceramic blank. By optimally designing the resin system, the transmission depth of the ceramic slurry system can be improved and the dimension errors of the formed part are reduced while the reaction activity of the systemis maintained; the interlayer binding force of the ceramic blank and the adhesive property between the ceramic blank and a printing platform are increased, and the distance between the ceramic blankand the platform and cracks on the surface of the ceramic blank are reduced; moreover, the regularity of powder particles arranged along a model surface is improved, so that the material can be made into a model with improved brightness and cleanness of the contour.

The invention relates to a core of a heat exchanger, comprising a cold fluid channel and a hot fluid channels. The cold fluid channel and the hot fluid channel are distributed in an overlapping way, are partitioned by partition boards and are crossed in the extension direction. The edges of the two sides of the cold fluid channel are provided with cold fluid channel seal strips. The cold fluid channel comprises the two cold fluid channel seal strips and partition boards arranged above and below the cold fluid channel seal strips; the two cold fluid channel seal strips are respectively arrangedat the inlet and the outlet of the hot fluid channel, and the cold fluid channel seal strip which is arranged at the inlet of the cold fluid channel is provided with a hole lengthwise. Because the cold fluid channel seal strip which is arranged at the inlet of the hot fluid channel is provided with the hole and is hollow, the flexibility of the hot fluid channel seal strip is improved, and the flexibility of the inlet of the whole hot fluid channel is improved accordingly. Therefore, the thermal stress impact to the core of the heat exchanger can be reduced, and the part of core of the heat exchanger, where the hot fluid flows past, can not crack due to the sudden change of temperature.

The invention belongs to the technical field of grinding wheel preparation and particularly relates to a method for preparing a grinding wheel according to a wet method. The method comprises the following steps: respectively adding powder glue, water, starch, binder, foaming agent and curing agent in proportion at different time, and then controlling the stirring speed, temperature and pouring speed in different preparing steps. The method provided by the invention has the advantages of simple technology and production equipment; the prepared grinding wheel is uniform in pore size and distribution; the mechanical strength, the abrasive resistance and the grinding property of the grinding wheel are greatly increased; and especially, the maximum porosity can reach 75%.

The invention discloses a processing method for an inner-ring-free cylindrical roller bearing alloy steel solid retainer, and relates to the technological field of bearings. The problems that after anexisting bearing retainer processing process, the working accuracy of a pocket hole of the bearing retainer and the surface roughness of the pocket hole do not reach the standard, and rolling surfacecan generate cracks in the lock opening rolling process are solved. The processing method comprises the following processes of lathe forming, hardening and tempering, rough grinding of the outer diameter, fine lathing of the two end faces, fine lathing of the inner diameter, even grinding of the two end faces, final grinding of the outer diameter, final grinding of the inner diameter, turning ofinner steps, marking, drilling, milling of square holes, pulling of the square holes, deburring, cleaning, stress relief annealing, glazing, lock opening rolling, dynamic balancing, magnetic powder inspection, silver plating, final inspection and packaging. According to the processing method, stress relief annealing is carried out before lock opening rolling is carried out, and the cracks generated by machining stress superposition and a surface cold hardening layer on the rolling surface are avoided. The processing method is suitable for processing the inner-ring-free cylindrical roller bearing alloy steel solid retainer.

The invention relates to a casting technique, in particular to a method for processing a metal mold low-pressure casting medium sand core for an aluminum alloy cylinder of an engine, wherein a method for coating a coating layer, removing water content and drilling vent holes is adopted to process the sand core so as to achieve the aim of preventing phenomena of sand inclusion, air holes, looseness, cracks, and the like.

The invention discloses a power supply component and an electronic cigarette with the same. The power supply component comprises a body and a rear cover fixedly mounted on the body, one end of the body is provided with a connection portion which is fixedly and electrically connected with an external load, the other end of the body is provided with an inner cavity for storage of electronic elements, the rear cover is fixedly mounted on the body and covers the inner cavity, and one end, away from the connection portion, of the body is provided with an extending portion facing the rear cover. Theextending portion covers the end, away from the connection portion, of the rear cover. Damages of an outer shell away from the end of a smoking port due to hitting in falling of the electronic cigarette can be effectively avoided.

The invention discloses a welding process of a hydrogenation reaction kettle cylinder body which is used for producing various chemical raw materials with a method of continuous hydrogenation. A plate resulted from compounding common carbon steel and stainless steel with the explosive technology is welded and processed into a cylinder shape, thereby overcoming phenomena such as easily-occurring welding cracks, and the like, which are caused by different material properties of the carbon steel and the stainless steel and by the welding among great-thickness carbon steels; and the production cost of the reaction kettle is greatly reduced. The hydrogenation reaction kettle cylinder body produced according to the welding process is widely applied in chemical engineering, pharmaceutical and other industries for producing sorbierite, xylitol, maltose, furfuryl alcohol, and the like.

The flat spring steel for automobile is produced via converter smelting process. Compared with available technology, the present invention has the following advantages and positive effects: utilizing molten iron with less harmful elements as material to result in high flat spring steel quality; higher finished product rate and lower power consumption to result in lower cost than production in electric furnace; casting molten steel into small square billet to omit the billet cutting step and lower cost; and high size precision of the continuously cast small square billet to ensure high size precision of flat spring steel.

The invention discloses a bimetal liner with a flanged flange and a manufacturing method of the bimetal liner. The bimetal liner with the flanged flange and the manufacturing method of the flanged flange have the advantages that the structure is simple, the process performance is good, the self-lubricating property is excellent, a copper alloy layer of a flange face cannot crack, and the production efficiency is high. The bimetal liner with the flanged flange comprises a shaft-sleeve-shaped bimetal liner, wherein an outer layer of the bimetal liner is made of steel material, and an inside lining of the bimetal liner is a copper alloy layer; and an outward-flanged flange side is arranged at one end of the bimetal liner and is also in a bimetal structure consisting of the steel material and the copper alloy layer. The bimetal liner is characterized in that the copper alloy layer is not arranged at an outer arc face at a bending part between the bimetal liner and the flange side. As the copper alloy layer is not arranged at the bending part, a situation that the copper alloy layer cracks is avoided in a flanging process. According to a flanging die used in the manufacturing method, the outward-flanged flange side is located in a pit of an upper die, and the outer edge of the flange side is limited by the edge of the pit and cannot extend and deform outwards without limit, so that a phenomenon that the copper alloy layer on the flange side cracks is avoided.

The invention discloses a simple log cracking prevention method with obvious effects. The log cracking prevention method is characterized in that a cylindrical pressure-reducing through hole is drilled in the axial center of a log. According to the log cracking prevention method provided by the invention, by virtue of the pressure-reducing through hole drilled in the center of the log, water of the log is released through the pressure-reducing through hole in the center of the log and an outer circumference surface of the log simultaneously. Therefore, the center and the outer surface of the log are more uniformly dried, the inner and outer contraction consistency of the log is good, and cracks are difficult to generate. Particularly, in a log drying and contraction process, the middle of the log is hollow, so that relative tension disappears when the former outward surrounding tension loses a center object supplying center counter-acting force (or supporting force) according to a principle of acting force and counter acting force. Therefore, the cracks are prevented on the four sides of the log, and the yield and the use rate of timber can be greatly improved.

Treatment of diesel engine cam shaft is carried out by high-frequency heating for cam gear, bearing gear and gear, spraying cooling liquid, quenching, taking water as cooling liquid, coating magnetic-conductive powder onto surface of inductor, stopping cooling at 160degree, controlling temper temperature and time and eliminating heat stress. It's cheap, has no crack and environmental pollution.

The invention relates to a calcium silicate board, and particularly relates to an environmental-friendly calcium silicate board and a production process thereof. The calcium silicate board comprises the following components in percentage by weight: 6%-7% of slaked lime, 9%-11% of wollastonite, 37%-39% of quartz powder, 36%-38% of cement and 6%-7.5% of paper pulp. According to the production process, because the temperature and water content of slurry are controlled in a pallet board preparation process, the pallet adhesion and the pallet dropping are prevented, and the temperature change and the water content during steam curing can prevent the phenomena of lamination and cracking of the pallet board; the finished product ratio of products is enhanced, and the cost is reduced.

The invention relates to a salt-bath furnace quenching method for teeth of a chain wheel. The method comprises the following steps of (1) placing a mixture containing BaCl2 and KCl in an intermediate-temperature salt-bath furnace for heating, wherein based on the total amount of 100 parts, the mixture contains 65 to 75 parts by weight of BaCl2 and 25 to 35 parts by weight of KCl, the mixture is heated to be completely melted at the heating temperature of 720 to 940 DEG C, and the melted mixture is the melt of a salt bath; (2) placing the teeth of the chain wheel in the salt bath for heating, wherein the heating temperature of the salt bath is 900 to 920 DEG C, and the heating time is set to be 26 to 30 seconds per millimeter of the tooth thickness of the chain wheel; (3) performing rapid quenching by utilizing a quenching medium after heating and heat preservation; (4) performing tempering heat preservation for 3.5 to 4.5 hours after quenching, and after heat preservation, discharging the teeth of the chain wheel out of the furnace, and air-cooling the teeth. According to the method, a salt-bath furnace quenching process for the teeth of the chain wheel is adopted, so that the hardened layer depth can reach more than 12mm; moreover, hardened layers with different depths can be obtained by regulating the heating time of the salt-bath furnace; the salt-bath furnace quenching process is high in the heating speed and convenient to operate, a workpiece is difficult to oxidize and decarburize, and the temperature is easy to control.

The invention provides a vehicle wheel spoke machining technique which is characterized in that a turned clamping spring groove is replaced with a pressed clamping spring groove. Specifically, the technique can comprise the steps of S1) spoke compressing, S2) clamping spring groove pressing and S3) center hole flange punching or the first step and the second step can be conducted at the same time. According to the vehicle wheel spoke machining technique, due to the fact that clamping spring groove pressing is conducted after spoke compressing or clamping spring groove pressing and spoke compressing are conducted at the same time before center hole flanging punching, the process of clamping spring groove turning is omitted, and damage to the internal structure and surface shape of a steel plate material is avoided; furthermore, through clamping spring groove pressing, the density of materials at the position of a clamping spring groove is improved, and as a result, the overall strength of a spoke is effectively improved, and cracking at the position of the clamping spring groove is avoided; meanwhile, the process design enables production efficiency to be improved greatly.

The invention relates to the technical field of tracked trolley bus frog welding, in particular to a welding process of alloy steel and a trough type steel rail. According to the welding process of the alloy steel and the trough type steel rail, the alloy steel and the trough type steel rail are welded together through a flash welding method; the welding process comprises a flash levelling stage,a preheating stage, a burning stage, an upset forging stage and a postheating stage; the total duration time of the welding process is 114s to 115s; the upset forging amount of the welding process is12mm to 12.8mm; and the total consumption amount of the steel rail of the welding process is 30 to 31.8mm. According to the welding process of the alloy steel and the trough type steel rail provided by the invention, the flash welding of the alloy steel and the trough type steel rail is realized successfully, the mechanical property of a formed welding joint is good, and the welding quality is stable.