60results about How to "Meet design accuracy requirements" patented technology

The invention relates to a processing method for bed die ferrules. The processing method is characterized by comprising the following steps of: grouping all ferrules according to the number of oil tanks, wherein each group of ferrules form one aggregate and each aggregate is processed with one blank; conducting rough processing, semi-refined processing and thermal treatment between the rough processing and semi-refined processing; drilling threading holes for line cutting and completing processing of other hole-shaped elements; conducting quenching thermal treatment; conducting finish processing of end surface of a disc, and carrying out qualitative thermal treatment; and cutting the disc into single pieces with a line cutting method. The processing method has the advantages of eliminating the quenching deformation of single parts, controlling the out-of-roundness of each single part to be within 0.07 and meeting the design precision requirement by adopting a multi-piece integrated processing manner, as well as removing repeatedly complicated processing procedures of single parts, reducing cutting quantity, improving the utilization rate of materials to 70% from original 30%, and further saving a great quantity of raw materials. In addition, the complicated tuning processing can be omitted, local process flows can be adjusted at any time according to change of production fieldconditions so as to be adapted to the needs of modern production.

The invention discloses a method for controlling accuracy of the shape of an ultrahigh-strength steel thin-wall cylinder. The method comprises the following steps of: 1) detecting the appearance of a cylinder; 2) mounting a special shape correction clamp; 3) tempering for stable shape; 4) discharging and cooling; 5) removing the special shape correction clamp and detecting the appearance; and 6) performing repeated shape correction. In the method, after a cylinder shell is quenched, the special shape correction clamp performs shape correction of the cylinder shell, and then the corrected shape is stabilized by tempering. The shape accuracy of the obtained cylinder shell is relatively high, and the requirement on the product design accuracy is completely met, wherein after the shape correction, the linearity error is not greater than 2.5 mm, and difference between large and small diameters is not greater than 1.5 mm. The processing method disclosed by the invention can be applied to the shape accuracy control on the cylinder shell of a secondary combustion chamber of a solid rocket ramjet.

The invention discloses a method for processing a circumferential taper hole of a special-shaped nozzle casing and a composite fixture thereof. The method includes: 1) rough machining of the nozzle casing; 2) flat grinding of the end surface of the nozzle casing; 3) the nozzle casing body semi-finishing; 4) Small end taper hole processing of the nozzle casing; 5) Outer taper taper hole processing of the nozzle casing; 6) Position accuracy detection of the circumferential taper hole. The invention adopts special composite fixtures, strict clamping and alignment methods to process the taper hole of the nozzle shell, high machining accuracy, and stable batch quality; during processing, alignment and tool alignment only need to be performed when processing the first taper hole , the follow-up taper hole is directly processed by adjusting the positioning plate, and the processing efficiency is improved; the space size of the taper hole is guaranteed by the composite fixture, and the positioning accuracy is high, which fully meets the product space dimension accuracy requirements.

The invention discloses a high-aspect-ratio wing optimization design method based on a model merging method, and belongs to the technical field of overall optimization design of aircraft. The method comprises the steps that a penalty function method is used for processing complex constraints for an optimization model and a system-level optimization model which are optimally divided into structure subjects as needed; a high precision pneumatic structure coupling analysis model and a low precision pneumatic structure coupling analysis model are built through a pneumatic structure coupling modeling technology; high precision sample points and low precision sample points are generated through an experiment design method; high precision sample information and low precision sample information are obtained by calling the high precision pneumatic structure coupling analysis model and the low precision pneumatic structure coupling analysis model respectively and stored; by using the model merging method, the high precision sample information and the low precision sample information are merged to build a surrogate model; optimization solution is conducted based on an optimization method for a current surrogate model, whether the optimization result is credible or not is judged according to a difference value of a true response value of the optimal solution and a surrogate model value based on the model merging method, if not, the step is executed again to rebuild a merging model for optimization solution, if yes, the optimal design result is output, and optimization design is completed.

The invention provides a special-shaped ceramic antenna cover machining device and method. The device comprises a head cone supporting ring, an inner molded surface aligning ring, end face pressing plates and a plurality of outer supporting mechanisms. Each outer supporting mechanism comprises an outer support and an adjusting screw rod, and the inner molded surface aligning ring comprises an insertion end and a fixed end. According to the device and method, the machining reference of an antenna cover is determined through a primary alignment tool, it is guaranteed that the position of a clamping space of the antenna cover in all working procedures is free of deviation, the machining reference is unified, and the machining precision is effectively controlled.

The invention relates to a measuring tool and a machining method thereof, particularly to a driving disc clamp detection measuring tool during machining of steam turbine blades and a machining method thereof. The driving disc clamp detection measuring tool during machining of the steam turbine blades and the machining method thereof are used for solving the problems of machining difficulty and low working precision of existing central measuring tools. The driving disc clamp detection measuring tool during machining of the steam turbine blades comprises an extension bar and a measuring tool body; the blade root portion at the lower end of the measuring tool body is identical in size and shape to the root of a blade to be simulated; the cylindrical boss of the measuring tool body is provided with a threaded hole, and the extension bar is connected with the cylindrical boss of the measuring tool body through threads. The machining method of the driving disc clamp detection measuring tool during machining of the steam turbine blades comprises, firstly, rough-milling out the measuring tool body and the extension bar, and performing quenched-tempered heat treatment on the measuring tool body and the extension bar; secondly, drilling out the threaded hold inside the cylindrical boss, and turning out the external threads of the extension bar; lastly, preforming finish turning after the measuring tool body and the extension bar are assembled to complete machining of the central measuring tool. According to the driving disc clamp detection measuring tool during machining of the steam turbine blades, the extension bar and the measuring tool body are of an assembly type structure, so that the machining time can be saved, and a locating degree within 0.03 mm can be reached.

The invention discloses a cold-drawing finishing device and a process. The cold-drawing finishing device comprises a die holder, and an outer die is fixedly mounted inside the die holder; the cold-drawing finishing device further comprises an inner die, wherein the inner die is fixedly mounted on a pull rod, and the pull rod is fixedly connected with a fixed core rod; the inner die and the outer die are used in pairs, and the distance between the inner die and the outer die is larger than or equal to 10 mm. The finishing device can carry out cold-drawing finishing on products which are generated in the cold-drawing production process and have out-of-tolerance dimensional accuracy again, so that the required dimensional accuracy is achieved, then the products are converted into qualified products, the purpose of saving resources is achieved, and meanwhile the cost is effectively reduced.