32results about How to "Avoid Folding Defects" patented technology

The invention discloses a ball flat iron production technique, comprising steps of billet, heating, symmetrical rolling, straightening and dissection. The invention is characterized in that the dissection process is carried out after the processes of symmetric rolling and straightening; hole shapes in all the passages of a rolling mill are constituted by two ball flat iron hole shapes which are symmetrically identical. By adopting the technique of symmetric rolling, the invention solves the problems that existing large and medium rolling mills can not produce small ball flat irons with symmetrical rolling and dissection technology. The invention has the advantages of the small size fluctuation of profiles when producing, particularly the small size fluctuation of width, thickness, ball filling and the lower arc of the ball flat iron, rollers subject to uniform forces, easy control in rolling process, greatly reducing the scraping, the rolling mark and the waves of the product by 50% to 70%, improving the quality of the product, enlarging the types of rolled products, leading large profiled bar rolling mill to produce small ball flat iron, enlarging the profile of the billet, large corresponding compression ratio, improving the comprehensive performance of the products, etc.

The invention relates to a forming die and method for magnesium alloy thin webbed supporting fork forgings, in particular to an isothermal die forging forming die and method for a rare earth magnesium alloy thin webbed supporting fork. The problems that rare earth magnesium alloy thin webbed supporting fork forgings are prepared through conventional forging, blank manufacturing and forming are hard, forming defects are prone to occurring, the structure performance of the magnesium alloy forgings is hard to control, and the performance is low are solved. The forming method comprises the main steps that 1, blank manufacturing is carried out; 2, forging forming is carried out; 3, cooling is carried out; 4, primary acid pickling is carried out; 5, damage repairing is carried out; 6, final forging is carried out; 7, secondary acid pickling is carried out, wherein a magnesium alloy forging obtained in the sixth step is subjected to acid pickling, graphite on the surface is cleaned away, and a formed forging with the treated surface is obtained; and 8, the formed forging with the treated surface obtained in the seventh step is put into an aging oven to be subjected to aging treatment, and the finished rare earth magnesium alloy thin webbed supporting fork is manufactured. The forming die and method are used for preparing of the magnesium alloy thin webbed supporting fork.

The invention discloses a forging forming method of a triangular aluminum alloy control arm and aims at solving the problems in the prior art of low quality of a product, low material utilization ratio and low production efficiency. The forging forming method comprises the following steps: 1, blanking; 2, heating a blank: heating the blank in the first step in an electric induction heating furnace at the heating temperature of 420-480 DEG C, keeping the temperature for 5-8min to enable the blank to be uniformly heated, and finishing dynamic recrystallization after finishing forging to obtain uniform microstructures; 3, roll forgingforming: 1) calculating a roll forging pass n; 2) roll forging forming: comprising the following steps: from (1) first-pass roll forgingforming to (4) fourth-pass roll forging forming; 4, mis-shifted forming; 5, flattening forming; 6, pre-forging forming; 7, finish forging forming: carrying out finish forging forming on the basis of pre-forging forming, designing a die according to a hot forging drawing during finish forging forming, putting a pre-forging into a mold cavity of the finish forging die, and then obtaining a part in finish forging forming under the action of a press; and 8, shaping the forging.

The invention discloses a local loading forming-based optimization method for a preformed blank of a rib plate part. Isothermal local loading forming is realized by controlling material flow and macroscopic defects of a transitional region. The preformed blank subjected to optimization design can effectively improve the uniformity of the material flow, reduce transverse material flow of a cross rib in the transitional region, and improve the filling capability of a rib type cavity. In engineering application, the usage performance of members is improved, the production cost is reduced, and a foundation is laid for forming and integrated manufacturing of large complex members made of titanium alloy.

The invention discloses a hollow near-forming forging method of a large MW wind power main shaft. The method is characterized by comprising the following specific steps that 1, a steel ingot is heatedto 1200-1250 DEG C, heat preservation is carried out, then chamfering is carried out, water removing and upsetting are carried out, and blanking is carried out after the steel ingot is pulled out; 2,the steel ingot subjected to the first step is heated to 1200-1250 DEG C, heat preservation is carried out, then upsetting is carried out by adopting a special anti-extrusion leakage disc, then the hole is punched downwards to a certain height through a special punching core rod, and then the special punching core rod is used for drawing to a certain size; 3, the steel ingot subjected to the second step is heated to 1200-1250 DEG C, heat preservation is carried out, then upsetting is carried out by adopting a special anti-extrusion leakage disc, then the hole is punched downwards to a certainheight through a special punching core rod, and then a flange is printed out; and 4, the steel ingot subjected to the third step is heated to 1150-1250 DEG C, heat preservation is carried out, then locally upsetting the flange through the leakage disc, and finally the flange is formed and finished to obtain a finished product. According to the method, the problem that the small-head-end inner hole is very small in wind power main shaft production is solved, the waste of raw materials in the production process is greatly reduced, and the production cost is low.

The invention discloses a multi-direction combined extrusion die for a large-dimension flange three-way valve body. A die chamber is partitioned into a middle die chamber and a side flange die chamber, the die is simple in structure and convenient to use, a blank does not need to be manufactured, metal in the molding process can be controlled to flow reasonably, the folding defect is effectively avoided, and the product quality is improved. The invention further discloses a multi-direction combined extrusion method for the large-dimension flange three-way valve body. The multi-direction combined extrusion die for the large-dimension flange three-way valve body is used, the middle die chamber and the side flange die chamber are used, the metal in the molding process can be controlled to flow reasonably, and the folding defect is effectively avoided; by means of the control method that a lower extrusion tray retreats first and then an upper extrusion tray carries out feeding, the metal die filling quality of the flange die chamber can be effectively improved; by means of the control method, the molding quality of materials can be effectively improved.

The invention discloses a production method capable of reducing a side part folding occurrence rate of a wide plate, and relates to the technical field of steel material forming and control. Continuously-cast casting blank adopts big-chamfer crystallizer drawn steel, and the big-chamfer casting blank is subjected to secondary chamfering after a continuous casting section is discharged, wherein secondary chamfering pressure is set to be 70-80 bar, and a secondary chamfering dimension is 13-15 mm; according to a rolling schedule, a widening-pass single-pass pressing rate is set to be smaller than 10%, and phosphorous removal operation is not performed in a widening process; after forming pass and widening, phosphorous removal operation is a performed in fine-rolling pass; a widening ratio isgreater than 1.5 times, trimming amount of a rolled steel plate is greater than or equal to 80 mm, a widening ratio of all steel types is lower than or equal to 2.0 time; and a widening ratio is setto be lower than or equal to 1.8 times if the strength grade of the steel type is greater than 500 MPa, and trimming amount of the rolled steel plate is greater than or equal to 100 mm if a widening ratio is greater than 1.5 times. The production method solves the manufacturing defect of side part folding in a production process of an extra-wide steel plate.

The invention discloses a combined split mold once extrusion forming method with a large flange middle through body, and meanwhile, discloses a vertical double-acting extrusion combination mold of combined split molds. Left/right horizontal concave molds are closed to form a peripheral mold cavity; upper/lower vertical extrusion molds and the closed left/right horizontal concave molds form an axial mold cavity of a flange; upper/lower vertical perforating tools are arranged in the upper/lower vertical extrusion molds; and water cooling devices are arranged in perforating needles. The forming method comprises the steps of preheating of the combination mold, returning of the molds to a given initial position, placement and positioning of heated blanks, horizontal mold closing, vertical double-acting extrusion and demolding after extrusion shaping; the once extrusion forming of the vertical double-acting extrusion combination mold is realized; each mold can be independently operated to move; the reasonable flowing of metal can be flexibly controlled to prevent folding defects; the flange part is fully filled with metal, so that products only need one-fire heating and once extrusion forming; and the method is short in procedure flow, low in energy consumption, high in efficiency and precise in size of the products.

The first purpose of the invention is to provide a forging and pressing method of steel rail heel; a steel rail heel comprises a pre-forging heel and a final forging heel; the pre-forging heel comprises a first section, a second section, and a third section; the final forging heel comprises a fourth section and a fifth section; the method specifically comprises the following steps: implementing a first stage forging and pressing after heating the first section, the second section and the third section, wherein the first two sections are molded by forging and pressing, the third section is pre-deformed; and implementing a second stage forging and pressing after heating the last three sections. The provided forging and pressing method adopts a measure of molding twice, thereby being able to solve the defect that the size of the molded final forging heel is unqualified, as well as greatly reducing the molding force in the entire steel rail heel product molding process. The second purpose of the invention is to provide a three-position molding die with a simple integral structure; a second upper die section inside a pre-forging rail molding cavity and a first pre-forging insert inside a final forging molding cavity are both in detachable structures, thereby meeting different requirements to the three-position molding die in the twice forging and pressing process; the three-position molding die is convenient to be assembled, and strong in practicability.

The invention provides equipment and a method for eliminating the edge black line defect of a large-width steel rolled material. The equipment comprises two opposite wide-face copper plates and two opposite narrow-face copper plates; the connection portions of the wide-face copper plates and the corresponding narrow-face copper plates are two continuous chamfers, each of which comprises a first crystallizer chamfer and a second crystallizer chamfer; and on the inner side of a crystallizer, an included angle between a first chamfer hot surface of each narrow-face copper plate and the corresponding wide-face copper plate is 155-165 degrees, and an included angle between a second chamfer hot surface of each narrow-face copper plate and the first chamfer hot surface of the corresponding narrow-face copper plate is 155-165 degrees. By utilizing the crystallizer and the method provided by the invention, a casting billet with a large-thickness chamfer surface can be produced, the corners of the casting billet during biting of each pass can be kept in a form of an obtuse angle at the whole broadening rolling stage, and the edge black line defect is not liable to occur on the rolled material.

The invention relates to a forming method of forging rounded square steel through a precision forging machine, and belongs to the technical field of steel forging. In order to solve the problem that the precision forging machine cannot forging the rounded square steel billet, the invention provides the forming method of forging rounded square steel by the precision forging machine. According to the method, a circular hammerhead is used for forging and forming, four passes are designed, the first to third passes are mainly circular deformation, and the fourth pass is the round billet which is transformed into the finished rounded square billet. According to the invention, the forging process parameters of the precision forging machine are optimized, the rounded square billet material finished product with high quality, high dimensional precision, dense and uniform structure and good surface quality are forged and used for hot processing such as forging, rolling, the folding defect of the products can be avoided, and the product qualification rate is improved. According to the forging method, the problem that the square hammerhead of the precision forging machine cannot produce the rounded square billet material is solved, the rounded square billet material is forged by using the round hammerhead, not only is the product requirement met, but also the working time of replacing thehammerhead is replace, the equipment production efficiency is improved, and flexible production organization is facilitated.

The invention discloses a one-time extrusion forming method of a horizontal double-acting combined mold of a double-flange middle body. Meanwhile, the method discloses a horizontal double-acting extrusion combined mold for vertical parting, the vertical upper female die and the vertical lower female die form a circumferential die cavity during die closing, the left horizontal extrusion die and theright horizontal extrusion die form an axial die cavity of the flange together with the vertical upper female die and the vertical lower female die after the die closing, the left horizontal punchingneedle and the right horizontal punching needle are arranged in the left horizontal extruding die and the right horizontal extruding die respectively, a water cooling device is arranged in each penetrating pin, the top head is arranged in the vertical downward concave die, wherein the vertical mold, the horizontal extrusion mold and the perforation tool can move independently. By utilizing the stroke of the extrusion head and the punching needle, the metal can be flexibly controlled to flow reasonably, and the folding defect is avoided, the metal filling of the flange part is full, the product can be formed only by one-time heating and one-time extrusion, the process flow is short, the energy consumption is low, the efficiency is high, and the product size is accurate.