Wheel bolt body action mode preset
Influenced by factors such as material properties, degree of deformation, preformed pore size, mold geometry, and lubrication conditions. Since the calculation method of the pressing force of the mixed extrusion composed of the positive extrusion and the radial extrusion is less introduced in the literature, the magnitude of the pressing force can be estimated according to the force required for the plastic deformation when the material is pressed. , namely: F = knsAmax = 1.34180163 = 117360N where: k safety factor, take k = 1.3; n bolt hole number, n = 4; s08F yield strength, MPa; Amax workpiece pressure maximum area, mm2.
According to the estimated pressing force, the J31-250B punch is selected to complete the extrusion of the nut seat hole. Mold design Cold extrusion relies on the mold to control the flow of metal, and the product is shaped by a large amount of metal volume transfer. Therefore, the structural form of the extrusion die, the size of each part, and the materials used have a great influence on the pressing force, the uniformity of the metal flow, the dimensional stability of the workpiece, the surface quality, and the service life itself.
Design of extruded convex and concave molds, concave mold material 124.00B Wheel spoke mounting structure Because the stress of convex and concave molds during cold extrusion is much larger than that of stamping, the material of convex and concave molds must have very High strength and hardness, with a certain degree of toughness and sufficient thermal fatigue strength, but also easy to forge and cut. Considering that the working part of the mold is small when the nut hole is squeezed, the material of the convex and concave molds is selected Cr12MoV.
Radial pressing convex and concave die structure The working size and shape of the convex and concave die are the key to forming the nut hole of the forming nut. The structural size is reasonable, the pressing force can be reduced, and the metal flow during the extrusion process is facilitated. When squeezing, the metal moves downward and around at the same time. When the extrusion is finished, the conical seat hole is extruded through the closed structure between the embossing die. Since the force for squeezing holes in the hollow blank is relatively small, its convex and concave molds are designed as a unitary structure.
When designing, the height of the guiding part of the front end of the punch should be greater than the thickness of the blank, and considering the longitudinal compression during wear and extrusion, the effective working size of the punch is 15+0.20mm, which should generally be 15+0.4 of the hole. 0.2mm design. The ejector and the unloading device are designed to eject the workpiece from the die, because the center hole of the workpiece is large, and the structural distance between the nut hole and the center hole is relatively close. The workpiece cannot be ejected by the ejector pin, so the pneumatic device is used to return the material from the top plate.
Since the extrusion has the possibility of adhering to the punch, a discharge device is also provided on the upper die for detaching the workpiece from the punch. Since the spokes are axisymmetric and the unloading force is small, the integral extrusion punch is used to extrude the die flat discharge plate (piece 14).
Mold structure nut seat hole integral mixed extrusion die structure as shown. Due to the symmetry of the structure of the workpiece and the small stroke of the press during extrusion, in the case of high processing precision, the special guide device can be used without the use of the die guide. The male and female molds are directly fixed to the mold base by screws and pins, and are the same as the stamping mold fixing method, and are firm and reliable.
Caution Cold extrusion is a plastic deformation of the metal blank under the strong pressure of the press, and is extruded from the slit of the convex and concave mold to obtain a predetermined shape and size. The pressure is great when squeezing, in order to smoothly realize the cold extrusion process, for this reason, the following points should be noted.
After the extrusion die structure discharge rubber (1) is assembled, the convex and concave molds (pieces 25, 26) of the four bolt holes must be flexible and the height should be consistent; (2) the top plate (piece 7) and the die The distance between the highest points should be kept between 56mm. If it is too small, the extruded bolt holes will be too small. If it is too large, the spokes will be easily deformed. (3) The assembled top material mechanism should be flexible and avoid jamming. .
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