Guangzhou YS Auto Parts Co.,LTD , https://www.zjysapcn.com
The part extrusion process is based on the dimensions of the cold extrusion part of the part. Considering that the preformed hole is to be drilled, the volume of the extruded blank is calculated to be 8708 mm3 according to the principle of volume. The blank is 16mm fine drawn round steel, which is cut by lathe and the length of blanking is 26.8mm. The process of extrusion is: lathe cutting→drilling pre-formed hole→annealing softening→rolling→acid washing→phosphating, saponification →镦镦 In order to prevent the punch from squeezing the internal spline, the wall of the hole is not supported, and the material of the internal spline cannot be in the state of three-way compressive stress, resulting in the lack of flesh or crack on the tooth surface during extrusion, so the top of the lower punch is set. A guide end, the guide end is first inserted into the preformed hole when squeezed.
The squeezing deformation degree check adopts the squeezing and compounding forming process, and the degree of deformation of the upsetting and the squeezing must be checked to ensure that the metal material is not scrapped or the rupture of the dies due to excessive deformation. The degree of deformation of the upset portion is generally expressed by the height reduction rate h.
The mold structure part is extruded and adopts a common black metal extrusion mold frame, and its mold structure is schematic. The punch is clamped to the punch seat by the punch sleeve. The lower mold adopts upper and lower split concave molds. The upper and lower split molds are all in the form of a three-layer combined die to save mold material.
The squeezing die structure shows that the preform is drilled in advance, and in order to prevent the punch from pressing the inner spline, the hole wall is not supported, and the inner spline part material cannot be in the three-direction compressive stress state, and the tooth surface is generated during the extrusion. There is no meat or crack, so the top of the lower punch is provided with a guiding end. When pressing, the guiding end is first inserted into the preforming hole, and then the internal spline is pressed to ensure the spline tooth shape extrusion during extrusion. General ferrous metal extrusion formwork, schematic diagram of its mold structure. The punch is clamped to the punch seat by the punch sleeve. The lower mold adopts upper and lower split concave molds. The upper and lower split die are full and smooth in the form of a three-layer combined die.
The convex and concave mold materials are made of W6Mo5Cr4V2 high speed steel. The other working parts are Cr12MoV, the heat treatment hardness is 61-63HRC. The reinforcing ring material is 40Cr, the medium reinforcement ring heat treatment hardness is 42~44HRC, and the outer reinforcement ring is 38~40HRC. Low temperature tempering at 200 ° C was performed to eliminate internal stress.