43results about How to "Guaranteed Dimensional Tolerances" patented technology

The invention discloses a manufacturing method of a pedestal bearing for a turbocharger and a positioning tool for the same. The manufacturing method comprises the following machining procedures of: 1), roughly turning one end surface and a hole of a workpiece; 2), roughly turning the other end surface and an outer circle of the workpiece; 3), annealing the workpiece to remove stress; 4), carrying out finish turning on the end surface and the hole; 5), carrying out the finish turning on the other end surface and the hole; 6), milling a semicircular positioning groove; 7), drilling radial holes at two ends; 8), milling the flat and square parts of the outer circle; 9), removing burrs by a bench worker; 12), milling an oil applying wedge surface of a thrust surface; 13), carrying out flaw detection; 14), removing the burrs by the bench worker and cleaning a part; and 15), carrying out comprehensive detection. The procedure 3) is adopted between the procedure 2) and the procedure 4) to anneal the workpiece to remove the stress; a procedure 10) and a procedure 11) are adopted between the procedure 9) and the procedure 12); the procedure 10) comprises the following steps of: adopting the positioning tool, positioning the outer circle of the workpiece by utilizing a tool hole, compacting the thrust surface of the workpiece, and accurately grinding the holes; and the procedure 11) comprises the following steps of: positioning the holes by utilizing a taper shaft, and accurately grinding the outer circle and the thrust surface. The manufacturing method and the positioning tool have the advantages that the procedures are arranged reasonably, and the machining quality and the machining efficiency can be effectively improved.

The invention relates to a method for rolling high-precision titanium alloy pipes. A prepared titanium alloy pipe billet is rolled in a combination way of two rollers and three rollers, and the rolling method adopts single feeding and double slew. The value Q of two-roller rolling is 0.4-2, the value Q of multiple-roller rolling is 0.4-9, and the amount of clearance is 0.2-2mm. The rolled finished pipe is processed in a way of outer surface grinding and inner surface honing to obtain the titanium alloy pipes, wherein the outer surface roughness Ra is less than or equal to 0.6 micrometers, the inner surface roughness Ra is less than or equal to 0.2 micrometers, the outside-diameter size tolerance is less than or equal to 0.04mm, the inside-diameter size tolerance is less than or equal to 0.03mm, and the wall-thickness size tolerance is less than or equal to 3 percent of a nominal wall thickness. Compared with the prior art, the method has the advantages that the size tolerance precision of the obtained products is relatively high, and the inside and outside surface quality is relatively good.

The invention discloses a technological method for processing an outer circular-arc surface and a rotary bracket used for the technological method. The rotary bracket comprises a central part which is a seamless steel pipe, wherein circular cover plates are arranged at the two ends of the central part; a plurality of triangular rib plates are arranged at the outer sides of the circular cover plates; and a plurality of groups of fixed parts are arranged at the outer side of the central part. In a processing process, the technological method is convenient in measuring the diameter of an outer circle of a workpiece, so that circular-arc-surface dimension tolerance can be effectively guaranteed; and a lathe is used for processing, so that the outer circle can be conveniently polished, and relatively large steps are prevented from being reserved in a circular arc surface processed by a milling machine; and the technological method is used for processing the circular arc surface of the workpiece, so that drawing requirements can be quickly and simply reached.

The invention discloses an austenitic stainless steel cladding tube used for a sodium-cooled fast reactor as well as a method for the production thereof. The stainless steel cladding tube has components, in weight proportion: 0.04 percent to 0.08 percent of C; less than or equal to 0.75 percent of Si; less than or equal to 0.02 percent of P; less than or equal to 0.02 percent of S; 1.5 percent to2.0 percent of Mn; 11.0 percent to 14.0 percent of Ni; 16.0 percent to 18.0 percent of Cr; 2.0 percent to 3.0 percent of Mo; 0.3 percent to 0.5 percent of Ti; less than or equal to 0.1 percent of Co;less than or equal to 0.002 percent of B; less than or equal to 0.035 percent of N; balance Fe. The double-smelting is adopted when in smelting, and the adding of rare earth elements is prohibited; the hydrogen protection or vacuum bright annealing treatment is adopted when in hot working; and a drawing process of empty sinking is banned in the cold working process, and the polishing treatment tosurfaces of finished pipes by mechanical method is prohibited. The stainless steel cladding tube made by the process can meet the requirements of the sodium-cooled fast reactor core subassembly.

The invention discloses a fixing piece and fixing method for large-size annular bonded NdFeB magnet cutting and shaping. The fixing piece comprises a chuck and a hoop which is used for restraining thechuck to achieve expanding and clamping of the chuck, wherein a cavity is formed in the axis position of the chuck, the chuck comprises a connecting part and a positioning part, the side wall of thepositioning part is provided with at least one clamping groove used for achieving expanding and retracting of the positioning part, the positioning part comprises a driving segment and a snap ring segment, the outer wall of the driving segment is provided with a tapered face, the front portion of the snap ring segment is provided with a fixing cavity used for positioning an annular piece, and thebottom end of the fixing cavity is provided with a protruding fixing face; and the exterior of the chuck is sleeved with the hoop, the hoop does relative movement along the tapered face to achieve expanding and clamping of the chuck. The fixing piece has the beneficial effect of being long in service life.

The invention relates to a fully-hydraulic four-arm anchor rod / anchor cable drill carriage. The fully-hydraulic four-arm anchor rod / anchor cable drill carriage comprises a traveling mechanism, drilling mechanisms, a lifting mechanism, a drill arm mechanism, a temporary supporting mechanism, a pump station part, an electrical system and a hydraulic system, wherein the electrical system is connected with the pump station part and is used for controlling the pump station part; the hydraulic system comprises an oil tank and a hydraulic pipeline; the hydraulic pipeline is used for connecting the oil tank, the pump station part and each execution mechanism; the traveling mechanism is positioned at the bottom of the drill carriage; an installation platform is arranged on the upper part of the traveling mechanism; the oil tank, the pump station part and the electrical system are fixed on the installation platform; the lifting mechanism comprises a front lifting platform and a rear lifting platform, which can independently lift; the drill arm mechanism comprises two front drill arms and two rear drill arms, which are respectively arranged on the front lifting platform and the rear lifting platform; the top end of each drill arm is provided with a drilling mechanism; the temporary supporting mechanism is arranged on the front lifting platform and / or the rear lifting platform. By virtue of the fully-hydraulic four-arm anchor rod / anchor cable drill carriage provided by the invention, the supporting operation of a working face of a tunneling machine can be mechanized, supporting efficiency and operation safety coefficients are improved, and the labor intensity is reduced.

The invention relates to the field of printed circuit board manufacturing, in particular to an auxiliary tool for manufacturing a PTFE gasket and a method for manufacturing the same. Through manufacturing the auxiliary tool, a PTFE plate is adhered on the auxiliary tool for laser cutting, the small-sized gasket can be machined, the PTFE plate with the thickness ranging from 0.5mm to 1.6mm can be machined, the outer edge of the manufactured PTFE gasket is burr-free, and the dimensional tolerance is ensured to be within a range of + / -0.05 mm. Moreover, the auxiliary tool is a universal tool, thePTFE plate can be positioned by means of optical alignment holes formed in the auxiliary tool, when the PTFE gasket is manufactured, only the corresponding drilling belt of the PTFE gasket needs to be changed without corresponding die sinking independently, the auxiliary tool is suitable for size requirements of various kinds of PTFE gaskets, and can be reused. Meanwhile, the auxiliary tool has the function of protecting a platform of a laser drilling machine, and greatly reduces the processing cost of gasket production.

The invention provides a hole drawing process for a thin-wall stainless steel hard tube assembly. The hole drawing process comprises the following steps that 1, blanking is conducted, specifically, firstly, a long hard tube is cut into equal small sections through a full-automatic tube cutting machine; 2, chamfering is conducted, specifically, chamfering is conducted on the cut chamfering machine through an inner and outer diameter chamfering machine; 3, punching is conducted, specifically, an elliptical hole is formed through a punching machine; 4, hole drawing is conducted, specifically, the edge of the drawn hole is turned outwards through a hole drawing machine to form a turned edge, the turned edge is ejected out of the outer wall of a metal pipe, hole drawing machining is completed, and the machined drawn hole is a plain-end circle; 5, shaping is conducted, specifically, the hard pipe is bent to 90 degrees through a pressure shaping machine to form an elbow; 6, an end face is flattened, specifically, the end face of a pipe opening is flattened through a single-station opening flattening machine; and 7, welding is conducted, specifically, a second elbow and a second standard cup opening are welded to a third steel pipe through a water segregator welding machine. The dimensional tolerance can be guaranteed, and risks caused by many welding seams are avoided.

The invention relates to the field of machining, in particular to a method for machining a lens cone part with the mass center deviating from the rotation center. The method includes the following steps that a blank is cast; heat treatment is conducted, wherein quench aging is adopted; a bench worker scribes a blank allowance distribution line with the non-machining surface as a reference; all the surfaces of an installation seat are milled on a milling machine, and the 0.1 mm finish machining allowance is reserved in the ruler lower end face; holes are roughly turned on a lathe, and the 0.5 mm allowance is reserved for the single side of the finish machining surface; heat treatment is conducted, wherein distressing artificial aging is conducted through heat treatment, and machining stress is removed; the finish reference installation surface is machined, in other words, the planeness of the lower end face scraped by the bench worker is within 0.006 mm, the other surface is scraped, and the perpendicularity of the other surface and the lower end face is within 0.006 mm. The operation is simple, vibration generated in the machining process is low, dimensional tolerances of the part can be guaranteed, and part machining accuracy and production efficiency are improved.

The invention relates to a numerical control machining method for a thin narrow notch with a thin edge. The notch is 32 mm in depth, and 3 mm in height, and is formed according to the following steps: 1) fixing a part on a tooling clamp; 2), carrying out roughing with a standard disk miller of which the diameter D is 60 mm and the thickness d is 2 mm; 3), carrying out semi-finishing with a standard disk miller of which the diameter D is 60 mm and the thickness d is 2.5 mm; and 4), carrying out finishing on the notch. According to the method, the problem that the size of the notch is extremely poor is solved; and a more reasonable method is provided for the numerical control machining of the whole tooling, so as to ensure high processing precision of the whole tooling and improve the production efficiency.

The invention discloses a busbar assembly device, a busbar self-piercing riveting system and a busbar assembly method. The busbar assembly device comprises a control device, a transverse reference device, a longitudinal reference device and a vertical reference device, wherein the control device is used for acquiring the parameter information of a busbar to be assembled and forming a control signal; the transverse reference device is used for providing a transverse reference of the busbar to be assembled; the longitudinal reference device is used for providing a longitudinal reference of the busbar to be assembled; the vertical reference device is used for providing a vertical reference of the busbar to be assembled; and the control device controls at least one of the transverse reference device, the longitudinal reference device and the vertical reference device according to the control signal and provides the transverse reference, the longitudinal reference and the vertical reference for the busbar to be assembled. In the busbar assembly device, the parameter information of the busbar to be assembled is acquired by using the control device, the control signal is formed, and the transverse reference, the longitudinal reference and the vertical reference, which are matched, are provided for the busbar to be assembled, so assembly accuracy and assembly efficiency can be improved, and the position relation between all parts of the busbar and the dimensional tolerance of the overall structure of the busbar are guaranteed.

The invention discloses a technological method for processing an outer circular-arc surface and a rotary bracket used for the technological method. The rotary bracket comprises a central part which is a seamless steel pipe, wherein circular cover plates are arranged at the two ends of the central part; a plurality of triangular rib plates are arranged at the outer sides of the circular cover plates; and a plurality of groups of fixed parts are arranged at the outer side of the central part. In a processing process, the technological method is convenient in measuring the diameter of an outer circle of a workpiece, so that circular-arc-surface dimension tolerance can be effectively guaranteed; and a lathe is used for processing, so that the outer circle can be conveniently polished, and relatively large steps are prevented from being reserved in a circular arc surface processed by a milling machine; and the technological method is used for processing the circular arc surface of the workpiece, so that drawing requirements can be quickly and simply reached.

The invention relates to a special-shaped steel pipe, an iron-making blast furnace cooling wall, butt-fitting tool and a butt-fitting method of a special-shaped steel pipe. the butt-fitting tool comprises a bottom plate, the two ends of the upper surface of the bottom plate are provided with a head-end butt-fitting device used for mounting a plurality of head ends of special-shaped steel tubes anda tail-end butt-fitting device used for mounting a plurality of tail ends of special-shaped steel tubes, the tail end butt-fitting device is fixedly connected with the bottom plate, and the head-endbutt-fitting device is movably connected with the bottom plate. According to the butt-fitting tool and the mounting method, the butt-fitting tool structure is reasonably designed, the size of the butt-fitting tool is controlled, the butt-fitting tool manufacturing process is formulated, and the butt-fitting tool is reasonably used, so that the size (interval, radian and taper) of the special-shaped steel pipe can meet drawing requirements before cast in the lower mold. The position of the assembled and formed special-shaped steel pipe cannot be changed in the process of transferring and hoisting, derusting and corrosion preventing because of the addition of the fixed supports. The problem that the assembling quality of the special-shaped steel tube cannot be guaranteed is solved, and meanwhile, the working efficiency is improved.

The invention relates to a stator base processing and manufacturing method, comprising the steps of: (1) inspecting the size allowance of a stator base blank piece; (2) using a carrying pole beam to lift the stator base blank piece to a vertical lathe workbench; (3) in a clamping process, welding three layers of pressing plates on a cylinder wall in a step shape, wherein each layer is provided with four pieces in a crossing mode to compress the stator base blank piece; and first performing rough turning, then loosening the pressing plates, and lightly pressing the pressing plates to perform finish turning on the size at each position; (4) measuring on the vertical lathe workbench to record all sizes to be used as a final installation size recording of a stator base; (5) using the carrying pole beam to lift the stator base after finish turning, and installing the stator base on a turning tool after assembling with a stator support; (6) turning the stator base, driving a turning mould to be lifted to a boring mill workbench, and using a drill lifting tool to lift a drill to distribute drilling holes after assembling with a sealing cover plate; and (7) turning trunnion apertures on two sides of a boring mill; and performing circularity regulation when deformation of the stator base is greater. The stator base processing and manufacturing method can effectively solve the problems of deformation and poor dimension.

The invention discloses a method for preparing a composite film on the surface of a rare-earth magnesium alloy structural part, which sequentially includes the steps of degreasing, first water washing, micro-arc oxidation, second water washing, electrophoresis, three times of water washing, and drying and solidification; micro-arc oxidation electrolyte Contains sodium silicate, sodium fluoride, sodium hydroxide, graphene, Cu(NO 3 ) 2 and triethanolamine aqueous solution, the electrical parameters of micro-arc oxidation are: forward current density 5~15A / dm 2 , negative current density 2~3A / dm 2 , the positive duty cycle is 25~70%, the negative duty cycle is 40~50%, the positive frequency is 200~800Hz, the negative frequency is 300~500Hz, the positive and negative series are both 1, and the micro-arc oxidation time is 10~20min; the electrophoresis liquid used for electrophoresis is an aqueous solution containing acrylate, matting agent and carbon black pigment, the electrical parameters of electrophoresis are: voltage 50~80V, time 10~30s; through the coordination of micro-arc oxidation and electrophoresis, it can be prepared A composite film that satisfies high hardness, high bonding strength, and UV aging resistance at the same time.

The invention relates to a fluid filter (10) for filtering a fluid, in particular air, comprising a filter housing (12) having a central support tube (22) which extends along a longitudinal axis (16)of the filter housing (12) within the filter housing (12) and a primary filter element (24) arranged inside the filter housing (12) in an exchangeable manner. There is a secondary filter element (26)positioned inside the filter housing (12) which serves as a safety-element during a replacement of the primary filter element (24). A sealing between a first end portion of the secondary filter element (26) and the filter housing (12) is effected partially or solely by the filter medium (28) of the secondary filter element (26). The first end portion of the secondary filter element may engage in agroove-shaped retaining structure of the filter housing (12). The invention further relates to a secondary filter element (26) for such a fluid filter (10).

The invention relates to a rolling method of high-precision titanium alloy pipe material. The method is to roll the prepared titanium alloy tube billet by combining two rolls and three rolls. The rolling method is single-feeding and double-turning, controlled The Q value of two-roll rolling is 0.4-2, the Q value of multi-roll rolling is 0.4-9, and the gap is 0.2-2mm. After the rolled finished pipe is processed by external surface polishing and internal surface honing Titanium alloy pipes with outer surface roughness Ra≤0.6μm, inner surface roughness Ra≤0.2μm, outer diameter tolerance≤0.04mm, inner diameter tolerance≤0.03, and wall thickness tolerance≤3% of the nominal wall thickness were obtained. Compared with the prior art, the present invention has higher dimensional tolerance precision of the obtained product and better inner and outer surface quality.