35results about How to "Improve geometric tolerance" patented technology

The invention discloses a box body of a railway vehicle traveling gearbox. The box body comprises an upper box body and a lower box body, wherein the upper and lower box bodies are fixedly connected to form the box body; an input shaft bearing pedestal and an axle bearing pedestal are arranged in the box body; the axle bearing pedestal is of a split structure, one half is located on the upper box body and the other half is located on the lower box body; the combination surface between the upper and lower box bodies is inclined; a plurality of reinforcement ribs are distributed on the surfaces of the upper and lower box bodies; the reinforcement ribs extend outwards from the periphery of the axle bearing pedestal; the input shaft bearing pedestal is integrally located on the upper box body; the end of the combination surface between the upper and lower box bodies close to the input shaft bearing pedestal is lower than the end close to the axle bearing pedestal; the included angle between the combination surface and the horizontal direction is ranged in 25-35 degrees; a torsion bar connection boss is arranged at the lower part of the end of the upper box body close to the input shaft bearing pedestal; and a safety support is arranged at the upper part of the end of the upper box body close to the input shaft bearing pedestal. The box body of the railway vehicle traveling gearbox is simple and reasonable in structure, safe, reliable and capable of satisfying the high-speed traveling requirement.

The invention discloses a milling processing technology of a solid solution steel double-gooseneck hinge. A milling process that lug areas are processed, and then a base area is processed is adopted, the phenomenon that the base thickness is small, and consequently, the form and location tolerance of the double-gooseneck hinge is too large is avoided, through addition of a feeding path, the radial cutting depth of a tool at the round corner is reduced, and the method for controlling cutting force mutation is used for improving the form and location tolerance; and a ring cutting processing tool path and reasonable milling parameters are selected for meeting the processing coaxiality requirement of two lugs of a hinge workpiece, the processing efficiency of the double-gooseneck hinge is improved, and the assembling hole position precision requirement is met.

The invention relates to an aramid skin-paper honeycomb sandwich shell structure and its preparation method and application, in particular to a Kevlar49 aramid fiber woven cloth reinforced epoxy resin base compound applied to the support structure of the spacecraft antenna subsystem The material skin-Nomex porous aramid paper honeycomb sandwich shell structure and its preparation method belong to the field of aerospace composite material structure and its forming technology.

A multi-redundancy dual-channel non-contact rotary transformer comprises a dual-redundancy ring transformer, a first dual-channel rotary transformer and a second dual-channel rotary transformer. A first ring transformer body and a second ring transformer body share the same iron core and have the same winding parameters completely; the multi-redundancy dual-channel non-contact rotary transformer is of a split magnetic path structure, a magnetic path of the first dual-channel rotary transformer is impendent from a magnetic path of the second dual-channel rotary transformer, and the single-pole dual-channel rotary transformer and the multiple-pole dual-channel rotary transformer are of a common magnetic path structure; two lead wires are led out of each of the input point, the output point and the earth point of the multi-redundancy dual-channel non-contact rotary transformer and connected with two electric connectors. According to the multi-redundancy dual-channel non-contact rotary transformer, the single-pole rotary transformer and the multiple-pole rotary transformer are combined, non-contact is achieved, multiple redundancies are achieved by adopting the dual-redundancy structural form, the dual-redundancy magnetic path form and the dual-redundancy circuit form, reliability of the multi-redundancy dual-channel non-contact rotary transformer is improved to a greater degree, the service life of the multi-redundancy dual-channel non-contact rotary transformer is prolonged to a greater degree, the failure rate of a system is reduced greatly, reliability of the system is improved greatly, angle measuring precision of the system is improved, and the service life of the system is prolonged.

The invention discloses a high rigidity and flexibility locating clamp which comprises a chuck base body and a work support plate, wherein the chuck base body and the work support plate are connected by a connecting device. The locating clamp is characterized in that the lower end of the work support plate is provided with a boss, the end surface of the boss is provided with a Z shaft locating surface, a plurality of locating grooves are arranged in the boss, the upper end of the chuck base body is provided with a plurality of locating teeth matched with the locating grooves, and the upper end of the chuck base body is provided with a Z shaft datum plane matched with the Z shaft locating surface. The side inclination of the locating teeth is 80-90 DEG, the side inclination of the locating grooves is 81-90 DEG, the side inclination of the locating grooves is 1-3 DEG bigger than that of the locating teeth, the bottom width of the locating grooves is 0.01-0.5mm smaller than the root width of the locating teeth, and both of the two sides of each locating groove are provided with dodge holes. The high rigidity and flexibility locating clamp has the advantages of high repeated locating accuracy, simple structure and low processing cost.

The invention relates to a processing technology for a plunger and barrel assembly. The plunger and barrel assembly comprises a plunger and a barrel. The plunger and the barrel are processed through processing technologies for the plunger and the barrel respectively, and then the plunger and the barrel are assembled together, so that the plunger and barrel assembly is formed. According to the processing technology for the plunger and barrel assembly, the processing is convenient; the technology is simplified; the processing flow is reduced; and on the premise that the product quality is guaranteed, the production cost is reduced, and the processing accuracy is improved.

The invention relates to a winding and curing device for thin-walled skirts made of carbon fiber composite materials, which includes a mandrel, a core mold installed on the mandrel, an inner wedge-shaped cylinder, an outer wedge-shaped cylinder, an upper pressure plate, a base, a screw, The upper regulating plate and the lower regulating plate, after using the winding curing device of the carbon fiber composite material thin-walled skirt type part of the present invention, can squeeze and solidify the fibers wound in the mandrel as a whole, and then heat and demould, in this way An extrusion curing process is added between winding and heating, which can further improve the dimensional accuracy, shape tolerance and surface finish of the carbon fiber composite thin-walled skirt.

The invention relates to an ultra thin reed forming die, comprising an upper die and a lower die which are connected and are provided with a plurality of upper cores and lower cores; the upper die andthe lower die are provided with connected reed support positioning surfaces which are configured mutually and are vertical to the moving direction of the upper core and the lower core; the lower endof the front vertical plane of the upper core is provided with a springback angle beta which is inclined inwards along the moving direction; the bottom surface of the upper core is provided with a springback surface which is vertical to the moving direction; the upper end of the rear vertical plane of the lower core is provided with a prebending angle alpha which is inclined outwards along the moving direction; the rear vertical plane of the lower core and the front vertical plane of the upper core correspond; the cross section of the upper core is set as a section with arc rectangles at the front side and the rear side; and the springback angle beta and the springback surface are arranged at the front side of the arc section. The invention has the advantages of being capable of greatly improving geometric accuracy and geometric tolerance of the reed in the process of bending and pressing, and being capable of realizing the accordance of stress points and deformation amount of a plurality of reeds between the upper die and the lower die, thus being capable of greatly improving qualification rate of products and reducing the cost of products.

The invention discloses a manufacturing method for a motor shell body. The method includes the flowing steps: S100, pre-machining a central hole of a motor base; S200, fixedly connecting the motor base with either end cover, taking the axis of the central hole as a standard to machine a circle of an externally connected stopping opening of the fixedly connected end cover, and taking the end face of the motor base as a standard to machine an externally connected stopping opening end face of the externally connected stopping opening of the end cover; S300, fixedly connecting the motor base with the other end cover, taking the axis of the machined circle of the externally connected stopping opening as a standard to machine bearing installation holes of two end covers and a circle of an externally connected stopping opening of the other end cover, and taking the machined end face of the externally connected stopping opening as a standard to machine an end face of the externally connected stopping opening of the other end cover. Compared with the prior art, the manufacturing method for the motor shell body enables the motor shell body to have a high-precision form and location tolerance, an assembled motor can still meet requirements of the high-precision size and the shape position tolerance even under the condition that assembling errors exist in an accumulated assembling process, the repairing rate of the motor shell body is reduced, abrasion of a motor in the running process is reduced, and the service life of the motor is prolonged.