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And elastic limit, low elasticity aftereffect and linear expansion coefficient, at the same time have high thermal stability and fatigue strength, non-magnetic, corrosion-resistant, are widely used in aviation, electronics, machinery, electric vacuum, instrumentation and so on.
The more critical elastic elements of our various product components are made from this material. The spring guide leaf spring is one of the main parts made of this material (). The part's production process is more complex, the main process is: a locksmith caulking a stack of riveting a hole in a line cutting forming a deburr a manual leveling of a vacuum elastic aging test a small degree. The processed parts require a flatness of 0.1 mm or less and no scratches on the surface. The part is processed with a 0.1mm thick strip. The raw material is supplied in a rolled hard state. Due to the elasticity of the material during the rolling process, the thickness is thin, the manufacturer only supplies the strip, and the strip is natural after cutting. Radiant, the original flatness of the part can not be used directly after the wire cutting is formed. In the actual production process, the flatness is always ensured by hand-leveling, then the elasticity aging treatment is performed, and the elastic rebound during the leveling process is relatively large. To achieve a flatness of 0.1mm, it is difficult, and it requires repeated adjustments. Generally, it takes 30 to 40 minutes to complete the leveling of a part. This affects the processing cycle of the part and therefore requires a more effective process. Measures to increase production efficiency. To this end, the following technological measures were explored.
1 Test materials and equipment 1mm) The chemical composition is as follows: The test pieces are exactly the same as the real parts, and the vacuum aging heat-leveling test is performed using a ZG464 high-vacuum furnace. The furnace temperature uniformity is within 2*C, and the vacuum degree is 6X10-5Pa. Table 1 3J1 alloy chemical composition ()% balance 3 test method 3.1 Use different plywood the same aging temperature when the results of the use of non-graded parts of each furnace 5, the aging flatness before processing are in the 1 ~ 1.5mm between. According to the relationship between aging temperature and hardness and tensile strength, choose the peak aging temperature and time.
The aging treatment process adopts the furnace heating up to 680*Q aging time of 3h, air cooling. In order to prevent the workpiece fixtures from sticking to each other, the thickness of the TC4 titanium alloy used for the splint material is 12mm. The outer dimensions and the splint machining process are as follows. See (a to d): The outer dimensions are 100mmX 180mm, and the rough machining is smooth; 150mm, roughing A plywood is smoothed by annealing; it is degreased by annealed to a level; 65mm, roughened and plywood is annealed and flattened and degassed again and again.
The flatness of the spring plate after clamping by four dimensions of the splint is as follows: 3. Leveling results when the same splint is used at different aging temperatures Each furnace uses five parts that have not been leveled, and the aging flat table 2 is used in four dimensions. After the splint clamping process, the flatness of the spring flatness is averaged a clamping mode b clamping mode c clamping mode d clamping mode Table 4 manually leveling aging after flatness aging technology average parts into the furnace n, 1 After normal aging, the lifespan is still 0.2 鹕, using M8 screws. And use manual bookmark2 surface are between 1 ~ 1. 5mm, splint material is 1Ci.18Ni9Ti stainless steel, thickness are 12mm, dimensions are 65mmX65 mm, plywood roughing an annealing and grinding a degassing again and again. In the center hole of the splint, add two screws to tighten the clamping process with a manual press plus 500kg pressure.
According to the relationship between aging temperature and hardness and tensile strength *C began aging strengthening, 700 * C is the aging peak temperature, so choose the following two aging process system, the results are shown in the table with the furnace heating to 680 aging aging time of 3h, air cooling With the furnace heating up to 600 aging aging time of 2h, air cooling.
Table 3 The two kinds of aging system after the treatment of the spring plate flatness aging process average 3.3 The leveling results when not using the splint 5 pieces of the sample processing, has been significantly improved, the average reached 0.08mm, to meet the requirements.
When the size of the splint is large, the flatness to 0.02 is more difficult, and since the splint has a large area and is used several times, it is easily deformed. In order to reduce the difficulty of processing the splint, a splint with a size of c is designed to further reduce the size, and an annealing process is added after the rough machining, thereby reducing the deformation of the splint during use, and the plane press pressurizes the 500 kg pressure pressure. Tightly fastened. After testing, satisfactory results were obtained with c-sprung plates. The flatness of all five spring-plate specimens averaged 0.07 mm or less, satisfying the requirements for use, and the effect was better than those treated with b-sliding plates. To verify that the smaller the splint size, the higher the flatness, the more concentrated gripping force, the more uniform the clamping force of the test piece, the better the thermal leveling effect, the splint as shown in d is designed and processed, and the middle two are added. One hole and two heat treatment of the splint to further eliminate its processing stress. Using a manual press, pressurizing and tightening with 500kg pressure, the hole in the center of the clamping plate is tightened with screws to effectively prevent the negative effect of laminating elasticity, so that the spring sheet is better laminated with the plane of the clamping plate to achieve better heat Leveling effect. The results showed that the flatness of five springs in d-slabs exceeded the original design requirements by an average of 0.058mm, but the test pieces and the surface of the test pieces were partially bonded. The plastic plates with lower hardness were used to grind into a spade. Lightly shovel the workpiece without affecting the shape and flatness, and can be reused. The M8 screw adds clamping force to the clamping plate, which makes the workpiece contact with the plane of the clamping plate better, reducing the influence of thermal stress on the flatness, and has a certain effect.
3J1 alloy process allows the aging temperature range of 550 ~ 700 °C, reduce the aging temperature to 600 * C, reduce the holding time to 2h, using the shape of the pliers shown in d aging, the average flatness of the test specimen is 0.072mm , It is slightly worse than the flatness 0.058 obtained by peak temperature aging, but it can also meet the use requirements. This result also shows that the aging temperature and time have a certain influence on the flatness of the test piece, but the influence of the splint shape and clamping method far exceeds the effect of the aging system. Within the time limit system of this material, by using a splint of the shape shown by d, the correct gripping can be performed, and the flatness requirement can be guaranteed after aging.
The test pieces clamped into the furnace without clamps have a large change in flatness after heat treatment, with an average value of 0.144 mm, indicating that clamping of the clamps is necessary, and the effect is also significant.
5 Conclusions The clamping method and the size of the splint will affect the leveling effect. The smaller the splint size, the higher the flatness of the splint, the greater the clamping force, and the better the leveling effect; the manually-adjusted spring piece is performed without the splint. During aging, if there is the effect of processing stress and phase change stress, there will be a certain deformation after aging; in the case of using plywood for aging, if the accuracy of the splint is not enough or the processing method is not proper, the excess error may still occur after the aging is completed; The use of appropriate shape and clamping accuracy to meet the accuracy requirements of aging, the leveling of the spring has a significant effect. In the case of proper operation method and shape of the splint and meeting the accuracy requirements, the splint can be directly used in the thermal aging process without leveling to level out the spring sheet that meets the requirements. For this part, the 65mmX65mm splint is used. Grinding 680Cx3h aging treatment of the best flatness, to meet the flatness requirements.
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