Continuous extrusion method and extrusion tool for lead frame material of shallow wheel trough

Abstract

The invention discloses a continuous extrusion method for a lead frame material of a shallow wheel trough. The continuous extrusion method comprises the following steps that (a) billets are pressed into a shallow wheel trough extrusion wheel by a shallow wheel trough compaction wheel; (b) the billets pressed into the shallow wheel trough extrusion wheel rotate with the shallow wheel trough extrusion wheel and are subjected to plastic deformation under the driving of a fraction force; (c) after forwards moving to a shallow wheel trough baffling block, the billets enter a shallow wheel trough cavity through a shallow wheel trough cavity inlet and are subjected to expansion deformation; (d) after being subjected to the expansion deformation, the billets are extruded through a mold in the shallow wheel trough cavity, so as to form a product. The continuous extrusion method and an extrusion tool for the lead frame material of the shallow wheel trough have the advantages that the service life of the mold is prolonged, and meanwhile, due to the decrease of the difficulty of the expansion deformation, deformed metal can rapidly enter the cavity and can be rapidly extruded from the mold, so that the production energy consumption of the unit product is reduced; secondly, a shallow wheel trough extrusion device with the same main shaft diameter can be used for producing products having larger widths and sections.

Description

technical field [0001] The invention relates to a method for continuously extruding lead frame materials of shallow wheel grooves and extrusion tooling. Background technique [0002] In the prior art, the lead frame material is an important material used in the packaging of integrated circuits and semiconductor components. It has high requirements for the strength, formability, electrical conductivity, and thermal conductivity of the material. At present, continuous extrusion The lead frame material is processed by the pressing method. The extrusion wheel rotates in the direction shown in the figure under the power drive of the main shaft. There is an annular groove on the circumference of the extrusion wheel. The blank is pressed into the groove of the extrusion wheel by the compaction wheel. With the movement of the extrusion wheel, the temperature of the billet gradually rises under the action of friction and begins to deform. The movement along the circumferential direct...

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Problems solved by technology

[0002] In the prior art, the lead frame material is an important material used in the packaging of integrated circuits and semiconductor components. It has high requirements for the strength, formability, electrical conductivity, and thermal conductivity of the material. At present, continuous extrusion The lead frame material is processed by the pressing method. The extrusion wheel rotates in the direction shown in the figure under the power drive of the main shaft. There is an annular groove on the circumference of the extrusion wheel. The blank is pressed into the groove of the extrusion wheel by the compaction wheel. With the movement of the extrusion wheel, the temperature of the billet gradually rises under the action of friction and begins to deform. The movement along the circumferential direction at the block is blocked, and it enters the cavity of the cavity, and then is extruded through the mold installed in the cavity. The shape of the extrusion wheel and the wheel groove of the finished product is basically a semi-open circle, and the depth is equivalent to the diameter of the billet. The disadvantage of this structure is that the depth of the extrusion wheel groove is relatively deep, and there The diameter difference (thickness of the extrusion wheel) decreases, the strength of the extrusion wheel decreases, and it often cracks from around the wheel groove; the matching height of the block and the wheel groove of the extrusion wheel is large, and the block is damaged by radial impact force As the torque increases, the raised part of the stop block is easy to crack at the root; the temperature gradient of the stop block is large, and the service life is short; the height of the convex edge of the compaction wheel is large, and it is easy to collapse or break; the deformed metal entrance of the cavity is small, and the production efficiency Low; because the lead frame material is copper alloy, its raw material has high hardness and high tensile strength in the initial state. Using the current structure to process the lead frame material, the service life of main tooling molds such as extrusion wheels, material blocking blocks, and compaction wheels lower production costs

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