The maximum outer diameter of the large bevel gear is 121, the middle is the wheel, the outer diameter of the wheel is eight 50, the maximum size of the inner hole is 83, the maximum height of the gear is 170Inln, and the teeth of the outer circle are made of web and rib. Connected with the middle wheel, the hot section of the wheel is in the middle of the wheel and the web. The pouring position is that the teeth are facing downwards, and there is a long distance between the teeth and the wheel. In the original process, the iron liquid was played by four price slaves, and the bottom of the wheel was flown by the person, and then gradually passed through the eight ribs to flow the entire circle of teeth. Since it is a casting tooth, the iron liquid is at the exit of the eight ribs, and one tooth and one tooth are overturned, and finally the entire tooth is filled. In this process, the heat dissipation of the molten iron along the path to the molding sand is relatively large, and the temperature of the molten iron flowing to the tooth portion is relatively low, especially the bottom of the tooth, so that the bottom of the tooth is easily separated. Especially when the flow rate of the gate is limited and the temperature of the molten iron is low, it is easier to form a cold partition defect.
The maximum geometrical hot section diameter of the diesel flowmeter in the wheel is about 70n, and the diameter of the top geometrical hot section is about m. On the original process, the dome of the bamboo shoot 45 is placed on the hot section of the wheel, but it increases. Contact with the hot section to extend the contraction time at the wheel heat zone. The riser stops the feeding flow at a small solid phase rate, and the riser action time is correspondingly shorter. The contact hot section of the wheel and the riser has not yet reached the riser, and the flow of molten iron in the riser has been blocked. When the neck of the riser is blocked, except for the lower part of the riser, the top of the household ladder wheel has been formed into a hard shell, that is, the top heat center of the wheel has been moved to the root of the riser, and the top surface of the wheel is no longer flowable. liquid. If the wheel is still shrinking, the iron can only be sucked from the root of the sun, resulting in a shrinkage hole at the root of the riser. According to the above analysis, it is believed that the design of the pouring system must ensure a large flow of Jiang Guoqiang, and the filling should be smoother and faster, and the riser should have enough iron liquid to facilitate the feeding. According to the structure of the large bevel gear, it is considered that two pressure-feeding risers are placed symmetrically in the wheel-yielding part, so that the riser slightly deviates from the hot section of the wheel.
Sheet metal fabrication processing is formed by laser cutting or stamping process, shear and bending, bending, bending, welding, riveting. The Sheet metal fabrication used are cold-rolled plate (SPCC), hot-rolled plate, galvanized plate (SHCC) (SECC, SGCC), copper (CU) brass, copper, beryllium copper, aluminum (5052), stainless steel. Sheet metal fabrication processing steps: according to the parts drawing (3D) expanded into a plan (2D), laser cutting or die stamping shape, CNC punching each bending part, should pay attention to the direction of the burr of the workpiece. Then the students are welded or riveted (some). Surface treatment after processing: electroplating, passivation, sand blasting (powder), anode treatment. Products are generally made for the connection and the outer cover. Applications in robotics, drone, communications, medical devices, industrial automation equipment.
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