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

The invention provides a method for producing an engine gear case. The method comprises the following steps of: adding raw materials containing iron into an intermediate frequency electric furnace, melting the raw materials containing iron into molten iron by heating, performing a reaction of the molten iron, the modulizer and alloy materials to obtain molten alloy, forming a metal-back shell mold by cast iron, and pouring the molten alloy into the metal-back shell mold; and after a long-time research by an inventor, the working temperature of products, the pouring temperature and the pouring speed of the alloy and the stay time of a casting in the casting mold are strictly controlled, and the metal-back shell mold is a breakthrough adoption for casting, so that the technical problems existing in the field that the dimensional precision is poor and the yield rate due to artificial production of the mold by using green sand for a long time are solved.

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 method for controlling a hot-rolled side guide plate in the field of metallurgy, and is a method for controlling a hot-rolled coiling side guide plate to improve the quality of a hot-rolled coil. After the strip steel enters the side guide plate, the side guide plate switches from position control to pressure control; during the pressure control process of the side guide plate, it detects that the position of the side guide plate changes by more than △Xmm, then the side guide plate switches from pressure control to position control, if the position changes If it does not exceed △Xmm, the side guide plate is always under pressure control; after the side guide plate switches from pressure control to position control, detect the pressure feedback value of the side guide plate, if the pressure feedback value exceeds K times the pressure setting value under pressure control mode , the position of the side guide plate is opened once every 5s by 2mm until the pressure feedback value of the side guide plate is less than K times the pressure setting value in the pressure control mode; when the strip leaves the side guide plate, the side guide plate enters position control . The invention effectively solves the problems of misalignment, edge-out, and side-cut quality defects in the shape of the coil when there is swimming and sickle bending in the incoming strip steel.

The invention relates to a precision calibration method for clearance between rolls of hot-rolling vertical rolls, which mainly solves the technical problem that strip steel is deficient in quality because verticality and alignment to calibration of vertical rolls are not considered in current methods. The technical scheme is that the calibration method for clearance between rolls of hot-rolling vertical rolls comprises the steps of: 1, finding a rolling center line and marking; 2, the distance from the marker line to the rolling center line = the distance from the rolling center line to the roller center line (as |ZB|) + the distance from the roller center line to the marker line; 3, hitting apertures on both sides of the vertical rolls to marked positions, wherein a roll block is inside a marking line and aligned with the marking line; 4, measuring the distance from the lower ends on both sides of the vertical rolls to the rolling center line, and marking the measuring point as a point A, the radius of the rolls as R / 2 and the distances from A to a vertical roll operating side and from A to a transmission side as |OA| and |DA|; 5, comparing the measured value |OA|+R / 2 on the operating side with |ZB|, wherein if the difference is in a precision range, the verticality is good, and if the difference is not in the precision range, the clearance between rolls on the operating side is adjusted so that the difference is in the precision control range; 6, adjusting the clearance between rolls on the transmission side by the adjusting method in the step 5; and 7, measuring the total aperture of the vertical rolls, inputting the measured values and calibrating the clearance between rolls of vertical rolls after adjusting the verticality and alignment.

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.

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 advantages are high effect and high welding quality.

The invention relates to a method for avoiding the burr defect of the ultra-low carbon steel edge. The weight percentage of C in ultra-low carbon steel is less than 0.0035%. The method specifically includes the following steps that the installation accuracy of a water cutting board and a guide device on rough rolling R1 and R2 mills are improved; the cooling water pressure of each rack in a roughrolling area, the diameter of vertical roll body water nozzle, the spray angle and the forward slip value are controlled; at the times of rough rolling, the heating tapping temperature, the rough rolling outlet temperature, the intermediate billet thickness, the reduction rate of each rack in finish rolling, the side pressure amount and the vertical roll rolling force are controlled. The method can effectively improve the edge quality of ultra-low carbon hot rolled strip steel, the subsequent cold rolling process production is prevented from being affected by the burr defect, the user requirement is met, meanwhile, the cold rolling repair is reduced, and the production cost of enterprises is reduced.

The invention discloses a method for producing a traveling wheel, which comprises the following steps: putting an iron-containing raw material into a middle frequency furnace and heating the iron-containing raw material; melting the iron-containing raw material into molten iron; reacting the molten iron with a nodulizer and an alloy raw material to obtain a molten alloy; making a sand-lined metalmould with cast iron; and injecting the molten alloy to the sand-lined metal mould. The inventor controls the working temperature of a product, the casting temperature and the casting speed of the alloy, the standing time of a cast product in the mould strictly after long term grope and adopts the breakthrough sand-lined metal mould for casting so as to solve the technical problems of poor dimensional precision and low finished product ratio of a long-term used green sand hand-made mould in the field.

The invention provides a glass substrate coating device comprising a coating mechanism, a coating stage and a particle removal mechanism. The coating stage is used for carrying a glass substrate to carry out coating via the coating mechanism, the particle removal mechanism is arranged at one end of the coating stage away from the coating mechanism, and the particle removal mechanism removes particles when the particles on the glass substrate are found, personnel enters a machine less frequently, and more particles are avoided being brought in; in the mass production, it is possible to the quantity of glass substrates to be repaired and increase capacity.