35results about How to "Reduce the amount of rework" patented technology

A technique for eliminating the deviation blowing of electric arc of welding austenite electrode by permanent includes measuring magnetic induction intensity and magnetic pole direction of the bevel to be welded, sucking a permaneng magnet to the bevel in such manner that their magnetic polarities are reversed, measuring the magnetic induction intensity less than 2 mT, and welding. Its advantagesare high effect and high welding quality.

The present invention discloses a method and a special clamping fixture for UV glue repair in the process of mobile phone camera assembling. Wherein, the method includes steps below: (1) Spreading UV glue between a lens base and a flexible printed circuit board; (2) Vertically arranging products with finished UV glue and keeping the flexible printed circuit board downward; (3) Taking a group of products processed in step (2) into a UV machine for UV solidification. In addition, the clamping fixture comprises a group of arranging boards to conveniently fix and withdraw product fastening pieces. After UV glues are spread between the lens base and the flexible printed circuit board, the method of the present invention vertically arranges products with finished UV glue and keeps the flexible printed circuit board downwards. Thus, gravity of the glue is utilized to balance glue penetration, thus reducing loss due to UV glue penetration and quantity of products returned for reworking.

The invention discloses a welding method for a nickel-based membrane type wall tube panel. The welding method includes the following steps that a tube panel is formed by nickel-based tubes (1) and nickel-based flat steel (2), and an anti-deformation tool (3) is arranged at each of the two ends of the tube panel; during welding, a specific welding sequence, a specific welding mode and specific welding line energy are adopted; and it is always kept that flowing cooling water exists in the tube panel in the welding process. The nickel-based tube panel is welded through the welding method, deformation and heat cracks, generated in the welding process, of the nickel-based tube panel can be effectively avoided, therefore, the dimensional precision requirement of the nickel-based tube panel is guaranteed, the repair amount of the nickel-based tube panel is reduced, the production period of the nickel-based tube panel is shortened, and the quality of the nickel-based tube panel is improved.

The invention discloses a fabrication method of copper crafts. The copper crafts are refined by eight procedures of smelting and melting copper; casting a sand table; welding accessories; polishing, trimming, finishing and plating; marking off and engraving; engraving designs, and spraying baking finish and molding. The mass fraction percent of copper and other metals is reasonably set, so that the processed copper crafts do not change in color, and are not easily oxidized at the same time. By adopting the procedures, the problems of size deformation, air shots, air bubbles and the like of the crafts are completely eradicated effectively, the repair amount and the defective index of the crafts are reduced, meanwhile, the quality of the crafts is improved, and the production cost is reduced.

The invention relates to a two-time positioning construction process for pre-buried channels of an overhead line system of a high-speed railway tunnel. By adjusting the procedure of installing the pre-buried channels, a larger operation space is provided for construction, and operators can conveniently and rapidly install channel sets on a lining trolley and can rapidly install C type channel sets, D type channel sets and E type channel sets by standing on edges of the lining trolley by means of frames such as ladders. The channels can be positioned in advance while secondary lining reinforcing steel bars are bound, time is used while the space is used sufficiently, multiple steps are executed at the same time and do not affect one another, and the result is gained with half effort.

The invention discloses an axial clearance matching machine for a hub bearing. A preselecting mechanism can be used for measuring an axial clearance of a bearing formed by assembling a to-be-assembled inner ring, a to-be-assembled outer ring and a standard retainer combination together and transmitting information to a control system; a ball storehouse is used for placing to-be-assembled retainer combinations with different tolerance ranges; a nesting mechanism can be used for pressurizing and nesting a preassembled product formed by the to-be-assembled inner ring, the to-be-assembled outer ring and a set of to-be-assembled retainer combination; a carrying mechanism can be used for conveying the pressurized and nested product into a measuring mechanism, carrying the product in the measuring mechanism to a defective product discharging station and carrying the product on the defective product discharging station to a subsequent output station; the measuring mechanism can be used for measuring the axial clearance of the product and transmitting information to the control system; a defective product discharging mechanism can be used for discharging the product on the defective product discharging station; and the control system is used for controlling the action of each mechanism. By using the axial clearance matching machine, the fit rate is increased, the phenomenon that a great number of intermediate products are detained does not appear, and the production efficiency and yield rate are increased.

The invention relates to a method for mine underground deep engineering support. The method is characterized in that a double-layered flexible rigid excess limited yielding type relative coupling support mode is adopted in the support process. According to the novel support principle for establishing deep engineering of a mine, namely the double-layer flexible rigid excess limited yielding type relative coupling support theory, a support process and a matched construction method of deep double-layered flexible rigid excess limited yielding type relative coupling of the mine are established. By adopting the method, the purposes that the deep engineering deformation and cracking of the mine are effectively inhibited, the service life of a tunnel is prolonged, the engineering repairing amount is reduced, the cost is reduced, and the normal construction, production and security orders under wells are ensured are achieved.

The invention provides a terminal crack prevention process of Q420 high-strength steel flux copper backing (FCB) submerged-arc welding. The terminal crack prevention process comprises the following steps of processing Y-shaped welding grooves at welding portions of steel plates, and after processing is finished, cleaning away oxidation layers and impurities on the faces of the Y-shaped welding grooves and the portions within the range of 20 mm away from the peripheries of the Y-shaped welding grooves; conducting assembling and positioned welding on the to-be-welded grooves of the steel plates;preparing arc striking plates and arc quenching plates; installing each arc striking plate and each arc quenching plate at the two ends of the corresponding welding groove; conducting backing weldingon the portion 200-250 mm away from the top of each Y-shaped welding groove and on the portion 450-500 mm away from the terminal of each Y-shaped welding groove; selecting a welding material which meets the requirement for conducting FCB submerged-arc welding; heating and welding a terminal trapezoid area; after welding is finished and weld joints are cooled, cutting off the arc striking plate and the arc quenching plate at the two ends of each weld joint. By means of the terminal crack prevention process, the terminal welding crack problem of Q420 high-strength steel flux copper backing submerged-arc welding can be effectively solved, and the repair workload for post-welding weld joint terminal cracks is reduced.

The invention discloses a negative-pressure vacuumizing pouring method for a high-pressure regulating valve casting. The method includes the following steps that S1, a sand mold is closed and put intoa tool which is a box body with an opening formed in the upper end, an air suction cavity is formed in the lower end of the box body, and the air suction cavity is separated from the box body througha filter screen; S2, the space between the box body and the sand mold is filled with dry sand; S3, after the spaced is full of the dry sand, plastic is laid at the upper end of the box body, and thedry sand is laid on the plastic; S4, a vacuum pump is started, and the air suction cavity is vacuumized; S5, pouring is conducted in the sand mold, and the vacuum pump is kept to be started; and S6, after pouring is completed, the vacuum pump is stopped. According to the method, the pouring speed is increased, the mold filling time of the high-pressure thick-wall casting is shortened, the qualityof the casting is further improved, particularly, the shrinkage crack defects of the chromium-molybdenum steel shot casting of the high-pressure regulating valve are overcome, and the problem of structure segregation of the high-pressure thick-wall valve body casting is effectively solved.

The invention relates to a flame cutting machine nitrogen accompanying purging system and method. The system comprises a metal hose, a high-pressure nitrogen hard pipe, spray nozzles and a fixing device; the high-pressure nitrogen hard pipe is fixed to the front/back position of a flame cutting machine cutting torch in the casting direction of a cast blank through connection of the metal hose; andthe spray nozzles at the tail end of the high-pressure nitrogen hard pipe act on the position of oxides, in a molten state, on the cast blank at the specified heights, intervals and included angles.The method includes the steps that the flame cutting machine nitrogen accompanying purging system is assembled; and an nitrogen source is opened, the spray nozzles of the flame cutting machine nitrogen accompanying purging system rapidly cool oxidative products which are in a molten state and are generated through flame cutting through a continuous high-pressure high-speed nitrogen stream, and thetwo ends of slits are stripped under impact and purging of the nitrogen stream. By means of the flame cutting machine nitrogen accompanying purging system and method, the cut end faces are more smooth and flatter, information is fed back simultaneously according to continuous rolling, and the amount of repair caused by hot rolling roll head and tail scab defects is decreased substantially.

The invention relates to an automobile wheel with inserts and an installation method of the inserts. The automobile wheel comprises a disc face, a center hole, bolt installation holes and spokes. The center hole is formed in the middle of the disc face, the bolt installation holes are evenly formed in the central disc face on the periphery of the center hole in the radial direction, and the center hole is used for containing an automobile axle coaxially. A plurality of spoke through holes are evenly formed in the portion, on the peripheries of the bolt installation holes, of the disc face at intervals, and a connecting structure between every two adjacent spoke through holes is a spoke. A rim is manufactured outside the disc face in the axial direction. A structural groove is formed in the portion, on the periphery of each spoke through hole, of the disc face. One insert used for wrapping the edge of the inner ring of each spoke through hole is installed in the structural groove of the corresponding spoke through hole. A plurality of installation holes are evenly formed in the lower ends of the inserts. The modeling of the inserts of the structure are consistent with the modeling of a window, the surfaces of the inserts are smooth and bright, the appearance can be more attractive, in addition, the inserts can improve the strength of the window, a window coating is protected, the wheel is protected, the spokes are prevented from being damaged, the overall performance of the wheel is improved, and the service life of the wheel is prolonged.

The invention relates to a small hole punching mechanism which comprises an upper die and a lower die, wherein the upper die comprises an upper clamping plate, a stopping plate, a stripping plate anda punching device; and the punching device comprises a first punching head clamping block, a second punching head clamping block, a punching head, a first stripping plate insert and a second strippingplate insert. The small hole punching mechanism provided by the invention has the beneficial effects that by adoption of the first punching head clamping block, the second punching head clamping block, the first stripping plate insert and the second stripping plate insert, the length of the punching head can be effectively shortened, the strength of the punching head can be improved, and the punching head breakage frequency can be reduced; the machining efficiency is high, the punching head can be directly replaced on a punching machine, the replacement time is short, the punching head need not be frequently replaced, the service life of the punching head is long, the waste of resources can be avoided, and the machining cost can be reduced; and the phenomenon that the punching of severalproducts is omitted can be avoided, the quantity of the products which are scrapped and need to rework can be reduced, the raw material utilization ratio can be improved, and the production cost can be reduced.