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

The invention discloses a bonnet support processing method and clamp and processing equipment for a bonnet support. The bonnet support processing method includes fixing a bonnet support through the special clamp to enable the central line of the bonnet support to be coaxial with the processing equipment; cutting a flange plane and an end face of a valve rod nut through the processing equipment; changing a cutter, rough-boring or fine-boring a valve rod nut hole, assembling a seal seat and a gland box; changing a cutter to enable the cutter to be coaxial with the processing equipment, rotating a rotation disc at 180 degrees, and finish-milling a thread of the valve rod nut; changing a cutter to enable the cutter to be coaxial with the processing equipment, rotating the rotation disc at 180 degrees, and drilling a flange hole; rotating the rotation disc at 90 degrees, and drilling an eyelet bolt hole and a lubrication hole of the valve rod nut on the support; changing a cutter, rotating the rotation disc at 90 degrees, scraping reversely and facing the back end face of the flange hole; and after finishing processing the back end face of the flange hole, disassembling the bonnet support. By the bonnet support processing method, processing on components can be finished through being clamped only once, and product processing accuracy and quality are improved.

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 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 and the 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 end of 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 present invention relates to special machine tool technical field of mechanical machining; specifically the present invention is a long overhung single-arm boring lathe; the present invention solves the problem that the working performance of various large motor base cutting machine tools is affected because of structural defect; the present invention comprises a lathe bed and a workbench which can slide along the lathe bed; a nut is equipped under the workbench and the lathe bed is equipped with a vertical long feed screw rod; the lathe bed end is equipped with a vertical feed mechanism; the output shaft of the vertical feed mechanism is connected with the vertical long feed screw rod; the front end of the lathe bed is connected with a base equipped with an oil tank inside; the base is fixed with a gear box; one side of the gear box is equipped with radial feed mechanism and the other side is equipped with a cantilever component; the radial feed mechanism is connected with the cantilever component and the front end of the cantilever component is fixed with a boring head component. The present invention is characterized by high processing precision, wide range, simple structure, convenient operation and excellent reliability; in addition, the cost is low and the present invention has great dissemination and application value.

The invention relates to an aramid skin-paper honeycomb sandwich cylinder shell structure, a preparation method thereof and application thereof and particularly relates to a Kevlar49 aramid fiber woven fabric reinforced epoxy resin based composite material skin-Nomex perforated paper honeycomb sandwich cylinder shell structure applied to a spacecraft antenna sub-system support structure and a preparation method thereof, belonging to field of spacecraft composite material structures and the 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 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 provides an equipment and turning process for journal turning of large shaft parts, including a turning assembly, a power mechanism, and a turning mechanism clamped on the large shaft parts. The turning mechanism includes two clamping parts arranged at intervals in the axial direction , the turning assembly can be disassembled and assembled between two clamping parts. There are center holes on both clamping parts. The two center holes are set coaxially and are used to pass through large shaft parts. Both are equipped with a positioning assembly connected to the orientation of large shaft parts. Each clamping part is connected to the power mechanism through a transmission assembly. Driven by the power mechanism, the two clamping parts rotate around the large shaft parts synchronously to realize driving turning. Components are used for turning repair of the journal of large shaft parts. The present invention can control the amount of cutting and the cutting amount of the back, and adopt different processing parameters such as cutting speed according to the rough and finishing processing, so as to avoid equipment vibration and achieve high dimensional accuracy and shape and position tolerance.

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 provides a direct drive motor stator shell machining tool. The direct drive motor stator shell machining tool comprises a chuck connecting base, a positioning connecting shaft and a locking assembly, the positioning connecting shaft comprises a connecting mandrel and a positioning sleeve which is arranged on the connecting mandrel and used for being connected with a stator shell in asleeving mode, when the direct drive motor stator shell machining tool is used, the chuck connecting base is connected to a lathe chuck, one end of the connecting mandrel is connected with the chuckconnecting base, the positioning sleeve is sleeved with the stator shell, the stator shell is locked on the positioning sleeve through the locking assembly, a lathe tailstock abuts against the other end of the connecting mandrel, lathe power is transmitted to the chuck connecting base and then transmitted to the whole tool, and at the moment, the stator shell can be machined. According to the direct drive motor stator shell machining tool, an inner hole of the stator shell is in full-size contact, large in contact area and high in supporting rigidity, roundness of the stator shell can be guaranteed, and the integrated tool is adopted, so that the size and form and location tolerance of the stator shell is guaranteed, repeated clamping and positioning precision of a workpiece is high, a numerical control lathe is adopted for machining, stability and high efficiency in the machining process are guaranteed, and the machining effect of the stator shell is improved.

Provided is a hard-sealing spherical valve suitable for a water-coal-slurry working condition. The water-coal-slurry is featured by being high in corrosivity and temperature, great in erosion and high in particle hardness. The method comprises an end cover connected with a belleville spring which is connected with a pressing ring. The pressing ring is connected with a sealing ring. The sealing ring is connected with a valve seat. The valve seat is connected with a sphere. A shaft sleeve sleeves the outside of the sphere. A pivot joint externally sleeves the shaft sleeve. Due to the fact that a sealing surface is made by metal material, required seal pressure is much higher than that of soft sealing. The structure of a combined valve seat with a spring and a valve seat is utilized. Through a high-load belleville spring, the initial preload sealing pressure is provided. The linear expansion influence of metal material at high temperature is taken into consideration. A combined design mode of serial connection of the belleville spring is utilized so that the initial prestressing force provided by the belleville spring is satisfied. The invention is applied to the hard-sealing spherical valve suitable for the water-coal-slurry working condition.

The invention relates to a positioning and clamping tool, specifically relates to a positioning and clamping tool for a shell part, and aims to solve the problem that the dimensional accuracy and thegeometric tolerance are difficult to guarantee in the conventional shell part machining process. The positioning and clamping tool comprises connecting screws, a tool base, a positioning pin assembly,a tool gland, double-end studs and a plurality of nuts, a protrusion is machined on the lower end surface of the tool gland, a plurality of through holes are uniformly distributed and machined in thetool gland, the tool base is a plate body with the upper end surface and the lower end surface parallel to each other, a groove is machined in the upper end surface of the tool base, the part is arranged on the tool base, the bottom end of the part is arranged in the groove in the upper end surface of the tool base in a protruding mode, the part and the tool base are located through the positioning pin assembly, each threaded hole of the tool base is vertically connected with one double-end stud in a threaded mode, the connecting screws are inserted into the through holes of the tool base, and the tool base is arranged on the threaded holes of a flange plate of a three-jaw chuck through the connecting screws and clamped through the three-jaw chuck. The positioning and clamping tool is applied to the field of machining.

The invention relates to a grinding process for a sealing surface of a nuclear main pump mechanical sealing part. The grinding process is used for grinding the sealing surfaces of parts of a static bottom ring, a sliding bottom ring and a rotary sliding ring in the nuclear main pump mechanical sealing part. A working site: the grinding of the mechanical sealing part should be performed in a constant temperature room, an operation room is clean and dust-free, the temperature is required to be 20-25 DEG C, and the rapid change of the temperature larger than 1 DEG C is avoided in the grinding process. Through rough and fine plane grinding and polishing processes, the planeness of the sealing surfaces of the static bottom ring, the sliding bottom ring and the rotary sliding ring in the mechanical seal is ensured to reach the precision of +/-0.2 microns, and the roughness Ra is 0.02-0.01. The mechanical seal of a shaft seal main pump is formed by connecting three stages of flowing pressure mechanical seals with the same structure in series, and the effect is to prevent a primary loop medium from leaking to the outside of the main pump to cause radiation pollution to the external environment.

The invention provides a horizontal two-end synchronous shaping die for a crescent plate casting. The horizontal two-end synchronous shaping die comprises a movable die body and a fixed die body, an I-shaped containing plate is fixedly connected to the middle of the bottom end in the fixed die body, two shaping sliding blocks are symmetrically and slidably connected to the bottom end in the fixeddie body, and two extrusion sliding blocks are symmetrically and fixedly connected to the lower end of the movable die body; and the two extrusion sliding blocks are arranged at the ends, deviating from each other, of the two shaping sliding blocks in an attached mode respectively, first inclined faces are arranged at the ends, facing the extrusion sliding blocks, of the shaping sliding blocks, second inclined faces used in cooperation with the first inclined faces are machined at the ends, facing the shaping sliding blocks, of the extrusion sliding blocks, and limiting plates are fixedly connected to the left side and the right side of the upper end of the fixed die body. The limiting plates are arranged at the lower end of the movable die body. Compared with the prior art, the horizontaltwo-end synchronous shaping die has the following beneficial effects that a horizontal two-end synchronous movement shaping method is adopted, so that the form and location tolerance of the two endsof a shaped crescent plate casting is greatly improved, and the product quality of the crescent plate casting is improved.

A method for molding an improved sight tube for fluid level related applications comprising molding annular grooves a predetermined distance from respective sight tube ends, a conduit substantially traveling about central axis, along the length of the sight tube, with substantially constant or varying diameter, and a second embodiment of the invention comprising molding secondary annular grooves in addition to the above described features, to reduce the potential for leakage between a fluid level verification apparatus end pieces and the sight tube and to reduce material and manufacturing costs for manufacturing the sight tubes.