42results about How to "Improve the passing rate of one-time inspection" patented technology

The invention provides a manufacturing process used for a high-stress valve spring, which can improve the quality and product qualification ratio of the spring product, reduce the production cost of the spring and comprises the processes as follows: spring rolling: steel wire blanks are rolled and made into semi-finished springs; primary temper: the spring is tempered at low temperature so that the stress is removed; spring grinding: two end surfaces of the spring are grinded so as to achieve the required length; chamfering: the burrs of the grinded spring are removed; stress optimization: secondary temper: the spring is tempered again at low temperature so that the stress is removed; shot blasting which is used for prolonging the service life of the spring; hot-pressing; load classification: the spring with bad load is removed and the product with qualified load is used as the high-stress valve spring product; oiling: the high-stress valve spring is oiled; and is prepared for packaging. The process improves the quality and the qualification ratio of the spring product and reduces the production cost of the spring as the working procedure of length classification is saved and the stress optimization process is arranged after the process of spring grinding and chamfering in the traditional process.

The invention discloses a sintering technology for a cemented carbide extrusion bar. The sintering technology comprises four continuous processes of positive-pressure hydrogen dewaxing, partial-pressure sintering, high-pressure and high-temperature sintering, and cooling. At a normal temperature, hydrogen is filled into an empty sintering furnace, the furnace temperature is gradually boosted to 600 DEG C stage by stage in 490 minutes, the hydrogen is cut off, a mechanical pump is used for controlling the vacuum degree in the furnace to be about 10 pascals of the inner pressure of a sintering box, argon is then filled into the sintering box so as to ensure that the inner pressure of the sintering box is between 300 and 600 pascals, the furnace temperature is gradually increased to 1410 DEG C in 235 minutes stage by stage under the pressure of 300-600 pascals, the furnace is kept at the temperature of 1410 DEG C for 60 minutes, high-pressure argon of 60 bars is filled into the furnace for 20 minutes after the thermal insulation at 1410 DEG C is maintained for 30 minutes, the high pressure of the argon is maintained for 10 minutes, the pressure maintaining and temperature maintaining are finished at the same time, and then, the furnace begins to be cooled. Under the condition of fully filling the high-pressure argon in the furnace, the furnace is naturally cooled to 900 DEG C and is then quickly cooled to below 50 DEG C after about 300 minutes. The sintering technology can be used for effectively improving the bending percent of pass of the thin cemented carbide extrusion bars with the diameter of no more than phi 6 millimeters.

The invention discloses a machining process of a propeller shell, comprising the following steps of: A, taking a steel plate and cutting the steel plate by a straight-line cutter or a cutting machine, so as to guarantee that the error degree of the cut steel plate is less than 2 mm; B, rolling the cut steel plate by using a rolling machine; C, butting and welding two ends of the rolled steel plate to form a cylinder, and carrying out nondestructive testing on a welding part; D, grinding a welding seam by using a grinding machine; and E, pressing and molding the grinded cylinder by using a mould to prepare the propeller shell. The machining process of the propeller shell has the advantages of improving the working efficiency and further improving the quality of products.

The invention discloses a technique for preventing defects of a surfacing wear-resistant layer of a part. By the technique, the surfacing quality of parts such as pistons is improved, the number of rework is reduced, the one-step delivery-check qualified rate of the parts is improved, and the production cost is reduced. According to the technical scheme, the technique comprises the following steps of (1) roughly turning outlines of a piston part to obtain a part with a cylindrical boss structure and forming an annular groove with the inverted-isosceles-trapezoid-shaped section in a cambered surface of a large end of the part; (2) surfacing a nickel-base superalloy auxiliary layer in the annular groove, performing crossing symmetrical welding, transversely welding the annular groove along the axial direction, sequentially welding the annular groove until surfacing on the whole annular groove of the part is finished and machining the auxiliary layer; (3) surfacing an aluminum bronze layer on the auxiliary layer and performing crossing symmetric welding; and (4) sequentially performing destressing treatment and finish machining on the piston part after the piston part is subjected to surfacing so as to obtain a finished product of a piston.

The invention discloses a wire/cable spinning mould, comprising a base, a thrust self-aligning roller bearing, a gear sleeve, a stranding die, an upper pressing cover, a signal pick-up device, a controller and a servo motor, wherein the thrust self-aligning roller bearing is arranged in each of the base and the upper pressing cover, the thrust self-aligning roller bearing is in interference fit with the gear sleeve, an external gear is arranged at one end of the gear sleeve, fastening antiskid bolts are arranged at the other end of the gear sleeve, the stranding die is in fixed connection with the gear sleeve by means of the fastening antiskid bolt, an in-die hole, a stranding tapered hole and a die exit are formed in the stranding die, and base fastening bolts are arranged at the lower part of the base. According to the wire/cable spinning mould disclosed by the invention, as the controller and the signal pick-up device are employed to acquire a spinning speed of an equipment stranding body, and a frictional force that is exerted by the stranding die in a tangential direction is eliminated by means of a synchronous and homodromous rotation of the servo motor and the spinning mould; the spinning mould has the advantages of small volume, low cost and long service life; material wastage is reduced by 15-20%; the one-time delivery qualification rate can reach 98-100%; and the product quality is improved greatly.

The invention relates to a method for improving an adhesive force between a metal film layer and a high-dielectric-constant ceramic substrate and belongs to the technical field of fine processing of microwave integrated circuits. According to the method, array scribing type etching roughening treatment is performed on the surface layer of a substrate by adopting ultraviolet laser with specific performance; high-temperature calcination is performed on the coarsened substrate under a high-temperature condition on the basis of a specific temperature curve, so that the roughness Ra value of the surface of the substrate is stabilized within the range of 0.25-0.3 mm, and good roughening uniformity is achieved; and the adhesive force between the metal film layer and the high-dielectric-constant substrate which serves as a base material in the process of manufacturing a microwave integrated thin film circuit.

The invention discloses a method for manufacturing a special-shaped ring forge piece of a pressurizing kettle flange, which comprises the following operation steps of: forming a kettle cover, pre-rolling a blank, replacing a special-shaped integrated main roller, rolling and forming, forming a kettle body, pre-rolling until an inner hole of the blank is larger than the maximum diameter of an integrated core roller, replacing the special-shaped integrated core roller, and forming the special-shaped ring forge piece of the pressurizing kettle flange. And then rolling and forming. According to the manufacturing method for the special-shaped ring forge piece of the pressurizing kettle flange, the core roller and the main roller are designed, a near-net forming mode is adopted, a kettle body and a kettle cover are rolled through a horizontal ring rolling machine, special-shaped rolling forming is adopted according to the product structure, a forming die is reasonably designed, and a performance heat treatment system is optimized; according to the special-shaped rolling production mode, the utilization rate of raw materials is increased, the production cycle is shortened, the manufacturing cost is reduced, the metal flow direction state of the product is guaranteed to the maximum extent, the comprehensive mechanical property of the product is further improved, and the market competitiveness of enterprises is further improved.

The invention relates to the technical field of wheel shafts, and provides a detection device of a wheel shaft. The detection device comprises: a base; a plurality of rollers installed on the base andcapable of rotating around the axle of the rollers themselves, wherein a mounting space of a wheel component is formed between the rollers; and a support piece arranged at least one side of the rollers in the axial direction of the rollers, wherein a limiting groove/limiting hole of a shaft component is formed on the support piece. When the detection device of the wheel shaft is used for detecting the wheel shaft, the rollers are rotated to expose the portion of visual inspection to the maximum extent to ensure the more comprehensive and careful inspection by inspectors. The different portions of the wheel shaft are inspected, the rollers only need to rotate with no need for carrying the wheel shaft, so that the inspection efficiency is improved, the labor intensity of the personnel is reduced, and the workers are avoided to be damaged. Besides, the detection device of the wheel shaft reduces the problem incidence of product quality, such as the rework rate and the rework rate that the shaft caused because of unexpected bumping, and the one-time handing-over and inspection qualification rate of wheel shaft is improved.

The invention belongs to the technical field of precision grinding technologies and particularly relates to a grinding tool and method for a square hole of a servo mechanism roller transmission piston rod. The tool comprises a base, a support assembly fixed on the base, a fixed block fixed on the side surface of the support assembly and located at the upper part of the base, a sliding block fixed on the side surface of the fixed block and located at the upper part of the base, a vertical rod fixed at the upper part of the support assembly, a press plate fixed on the vertical rod and capable of moving up and down, a spring with one end fixed at the lower end of a middle hole of the press plate as well as a spring fixing seat fixed at the other end of the spring; and opposite V-shaped grooves are formed in the fixed block and the sliding block. With the precision grinding technology for the square hole of the servo mechanism roller transmission piston rod, the edge collapsing phenomenon is eliminated, the first-time yield is substantially increased to be 95% or higher, machining procedures are reduced, the workload of surface treatment and grinding procedures is also reduced, and the production quality and efficiency are substantially improved.

The invention provides a rapid positioning and mounting tool for a chain stopper and a positioning and mounting method. The rapid positioning and mounting tool for the chain stopper at least comprises a plurality of groups of positioning and mounting parts. Each group of positioning and mounting parts at least comprises a first fixing part (1), a second fixing part (2) and a length adjusting part (3), wherein one end of the length adjusting part (3) is connected with the first fixing part (1); the other end of the length adjusting part (3) is connected with the second fixing part (2); and the length of the length adjusting part (3) can be adjusted. During positioning and mounting, the first fixing parts (1) are fixedly connected to the chain stopper (4); the second fixing parts (2) are fixedly connected to surfaces, to be mounted, of the chain stopper (4); the plurality of positioning and mounting parts are distributed along the periphery of the chain stopper (4); and the mounting position of the chain stopper (4) is adjusted by adjusting the lengths of the length adjusting part (3). The rapid positioning and mounting tool for the chain stopper is advantaged in that the rapid positioning and mounting tool is easy to operate, a plurality of adjusting operations can be realized within a short time, autonomy, controllability and mobility can be enhanced and the cost can be reduced.

The invention particularly relates to a method for finely adjusting the glossiness of a water-based matte finish paint by improving a spraying process, and belongs to the technical field of water-based coating spraying construction. The technical problem to be solved is paint film glossiness deviation caused by construction factors. The method for finely adjusting the glossiness of the water-basedmatte finish paint by improving the spraying process comprises the following process conditions: (1) the paint viscosity of the water-based epoxy finish paint spraying process is improved to be 20-23s; 2) the flash-drying time of the water-based epoxy finish paint is canceled, and 3) the finish paint is baked at 45-53 DEG C for 2-2.5 h. The problem of paint film glossiness deviation caused by construction factors is effectively solved by investigating the factors such as the drying mode, the flash-drying time and the paint viscosity, and the one-time delivery qualification rate of products is improved.