6 Cangzhou 350 Jia steam turbine generator stator punching film Tang Qunhua Shanghai Motor Factory Co., Ltd. Technology Rice Development Center. This paper introduces the stamping process of the stator punching piece of 350MW steam turbine generator, the structural characteristics of the blank film of the bulk film and the manufacturing quality control plan.
1 Introduction Zhangzhou 35, steam turbine generator is a product produced by Westinghouse and Shanghai Electric Turbine Generator Co., Ltd., and our company is responsible for the manufacture of stator and base parts.
The 300MW600MW turbo generator differs in that the stator adopts an axial ventilation structure, and the structure of the corresponding stator segment also varies greatly. Each stator segment has a plurality of axial ventilation holes distributed thereon, and the size of the punching piece is further Especially large, this brings a lot of difficulties to the structural design and manufacture of the fan-shaped blanking die. In order to reduce the same plate difference of the material, Westinghouse requires that the punching center of the stator segment must be on the center line of the roll blank, and the existing equipment of our company cannot process the stator segment stamping, only Can be operated by hand. In view of safety, higher requirements are placed on the mold structure design and the punch manufacturing process.
Compared with the previous 300MW600MW, the production process of the turbine fan-shaped stator blades of the 350 turbine generators requires all the inspections from the raw material storage identification to the process documentation, the production process control, the packaging and shipping, etc. according to the Westinghouse process specifications. New process measures to ensure the 350MW stator segment.
2 The main process in the Westinghouse process specification is difficult.
2.1 When punching, the direction of the tooth of the punching piece should be perpendicular to the direction of the material's milking direction. The center of punching punching should be on the center line of the material, and the sleeve should be used, that is, the direction of the tooth is up and down when the sample is placed.
2.2 Punching sheets are only allowed to have single-sided burrs, and no defects such as bending deformation are allowed. The die unloading device is not allowed to damage the punching sheets.
2.3 When the punching film is removed, the scratches cannot exceed the edge of the punching edge. 3 After the hair is removed, no burr is allowed to allow a small amount of random burrs. The height of the burr is less than 0.013, and the burr position of each punching piece cannot be in the same position.
2.4 After the painting, the punching film needs to be rustproof, but the rust inhibitor cannot be used.
3 Determination of the process plan The material used for the stator segment of the 350MW turbine generator is made in China. The 3290, 0.5, 1 thick cold-rolled silicon steel sheet is evaluated. The full circle is made up of seven semi-stator fan-shaped pieces, each of which has a fan-shaped piece. 36 axial vents and 2 screw holes, with different dimensions and positions on the stepped punch, the following process 2 and plan were determined according to the requirements of Westinghouse's process specifications.
3.1 Cutting materials Because Westinghouse's stamping equipment is advanced, its work surface is inclined, and the trapezoidal blank will be white and smooth when punching. Therefore, the trapezoidal trim size can be as long as the product sample. Our company's stamping equipment is relatively 6, trapezoidal trimming can only be manually fed into the die mouth when punching, and the blank has a wide mouth of 1000 claws. Therefore, the punching center should be punched on the center line of the rolled blank. The toothing is perpendicular to the rolling direction of the blank, and the process must be considered. The operator can completely operate the blank when the blank is blanked. It is determined that the size of the trimming material and the width of the blank of the scheme are 3.1.1 and the parallel polygon of the 10001677 is cut by the claw 1. Such as å› 3! And stacking 3.1.2 points in turn and cutting into 8 trapezoids, 315 pieces, the pieces are successively stacked on top of each other; 3.1.3 The 8 trapezoids are sequentially cut off the shaded parts of the big head. 30, and stack them one by one.
Rolling direction å›3 shape-selective shear é’ 3.2 all the outer shape venting holes and screw holes of the blanking body, and the blanking side and the side of the trapezoidal material are positioned during blanking.
3.3 Tangential rounding In order to prevent leakage at the end, the punching pieces at both ends of the iron core are stepped punching and slit punching, stepped punching, and cutting the inner circle of each gear.
3.4 punching slit, because the position of the slit groove is symmetrical to the center line of the punching piece, the sub-die cannot be stepped out, and it needs to be divided into half-punching, that is, after half-punching, the positioning is adjusted and then the other half is punched. The same plate difference of the material, in the yoke of the stator segment, a certain number of yoke pads are required, and the punching is positioned by the 2415.88 venting holes on the body punching piece, and punched by the CNC32 automatic punching machine.
3.6 Dehairing Because the company's existing belt deburring equipment has a width of 1000mm, and the chord length of the stator sector is more than 1000, it can't be removed according to the conventional method. Therefore, after the test, the punching piece is tilted at a fixed angle, and the yoke is sent to the hair. The machine performs hair removal.
3.7 Painting is painted and baked according to the special requirements of Westinghouse's impact coating.
4 The selection of the stamping equipment mainly refers to the selection of the punching equipment when the bulk punching is blank, and the punching force is calculated by the circumferential thickness and shear strength of the root punching sheet.
The calculation formula is ±=1,1L, the circumference of the blank, the thickness of the material of the blank, and the shear strength of the material of the blank. 2 According to the calculation data, the pressure is sufficient, and the work needs to be considered. The size of the countertop is sufficient to comprehensively analyze the existing production equipment of our company, and it is most suitable to select the new 3150KN gantry punch. The working surface of the punch is 16000, 2000 is estimated to be enough for the installation of the mold, and the punch has a robot, and the workpiece can be taken away by the robot when punching, which can facilitate the punching operation.
5. The selection of the structural design scheme mainly refers to the mold structure of the bulk stator blade multi-section blanking die. Since the punching die size is particularly large, the convex and concave die adopts the conventional large block structure, and the dimensional accuracy of the product is higher. , the number of punching, so the mold structure to the embodiment uses a flip-ball-type guide posts guide bush structure, but its structure is different from the conventional, which uses a removable guide post structure, i.e. with the guide post when mounting the die to be transferred After the school is qualified, the guide column near the left side of the operator is removed, which is convenient and safe to operate. The other key is that the unloading device and the way of discharging the mold are completely different. Because Westinghouse requires the die unloading device to not damage the punch. The sheet is unloaded, so the discharge device of the mold adopts a small guide column structure, which improves the guiding property of the top rod in the unloading device, so that the punching sheet stuck in the concave mold after punching is as flat as possible when the top rod is pushed down. Under the premise of determining the overall structure, there is still a question of waste. Because the size of the scrap hole on the stamping equipment is only 4,450, and the distribution size of the vent hole on the punching sheet is much larger than this diameter, in order to solve this problem, under the premise that the stamping equipment cannot be improved, how to weld on the lower mold base of the mold The ribs allow the waste to fall on the work surface between the ribs, and then the waste is manually removed, thus filling the shortage of the equipment, and under the premise of using the existing equipment, the equipment can be operated normally and can be guaranteed. product quality.
6Development of manufacturing quality control plan Due to the particularity of the product, in addition to the process card and the corresponding process code, the manufacturing quality control plan shall be prepared according to the requirements of the Westinghouse process specification. This plan must meet the production habits of our company, and must be recognized by Westinghouse. As a guiding document in production, it details all the contents of the manufacturing process and process. The main points are as follows: 6.1 Process technology preparation requirements The gauges and instruments used for all equipment inspection products are in good condition. The operator must hold the corresponding employment certificate and the quality assurance book for the raw materials.
6.2 When starting the cutting of the rolled blank, the production workshop is required to record the item number, the large volume number and the material weight on the logistics card. The trapezoidal trims of each small volume are stacked on a shelf. Make every punch have a source, cut 6 each! 1 check, and record whether the trapezoidal trim size is correct, if it is wrong, it should be corrected in time. Every step from the cutting of the paint to the end of the painting must pay attention to the light handling of the punching sheet to prevent the punching sheet from being bent and deformed.
6.3 Each stamping sheet shall be inspected first after stamping. The punched sheet that has passed the first inspection shall be taken as a sample. During the production inspection, the personnel shall carry out the inspection and inspection according to the sample. Any unqualified parts shall immediately stop to find the cause until the qualified party Production can continue.
6.4 When the main body punching sheet is stamped, the mold structure and equipment are completely passed through the garbage to prevent the garbage from being clogged and shorten the service life of the mold.
6.5 After the stepped punch is cut inward, every 50, 1 inspections, the size of the screw hole is smaller by 0.
20mm positioning pin positioning, if it is more than 0.
76! The above must be removed or reworked.
6.6 When punching all punching sheets, pay attention to the direction of the burr and keep the burr direction. When the hair is removed, the tilting angle of the punching film and the test are caused. After the thickness of the punching is adjusted according to the thickness of the punching sheet, the edge scratches cannot exceed 3, and the hair is removed. Do not damage the punched surface during the process, otherwise it must be removed. No burrs after hair removal.
6.7 When punching the paint, each punch must be carried out in sequence, and it must not be mixed. After the painting is finished, the rust is prevented from being rusted. It should be stacked on the shelf with special paper in turn. After the film is cooled, it should be covered with plastic bag in time, and the anti-rust powder should be placed in each plastic bag. After sealing, Each piece of the film shall be remedied in time if it is damaged during the lifting process.
7 Conclusion The punching of the 350MW turbine generator stator punching piece, with the strong support of the company's leaders and the cooperation of the production workshop, overcome various difficulties, solve the quality requirements of various technically difficult products, and complete the task ahead of time. Westinghouse experts highly praised. To this end, Westinghouse intends to continue the cooperation of the 900MW steam turbine generator stator segment with our company, so that our company has opened up a broader market.
Cnc Busbar Bending Machine is the computer-controlled equipment dedicated for busbar bending, performing various bending operations through the coordination of X-axis and Y-axis movements, assisted with manual feeding. The selection of different dies can complete the plane bending, side bending and other processes of busbar. The machine can be used in combination with GJ3D software, and is able to accurately calculate the spread length of the bend. As to the frequently bent workpiece, it can automatically find the bending order to achieve programming automation, simulate the bending order to place busbar and avoid errors in determining the bending positions.
Busbar Bending Machine,Cnc Servo Bending Machine,Cnc Busbar Bend Machine,Cnc Busbar Bending Equipment
JINAN EURO-ASIA INT'L CO., LTD , https://www.eaelectricmachine.com