Layered composite hard metal stretching die

A cemented carbide, layered composite technology, applied in wire drawing dies, metal processing equipment, forming tools, etc., can solve the problems of easy cracking of mold cores, low efficiency, and difficult implementation.

Inactive Publication Date: 2009-01-28
罗达成 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method achieves the purpose of saving W and Co resources and reducing the cost of raw materials, there are: (1) the process is complicated, difficult to implement and low in efficiency; (2) because the hard alloy is wrapped by cast steel in the inner layer , There are obvious defects (gaps) in the composite interface of the two types of materials, and the interface is a discontinuous transition. When the outer diameter and height of the cemented carbide core are smaller than the design requirements, the core is easy to break

Method used

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  • Layered composite hard metal stretching die
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0015] The implementation method takes the production of the cemented carbide part with the grade YG8 and the specification of 11-5.6-28 layered composite cemented carbide drawing die as an example:

[0016] A. Preparation of mixture: take a: TiC-WC / Ni composite: 75% / 25%; b: TiC / WC: 60% / 40%; c: Ni+Co / Mo: 85% / 15% as The basic composition of the layered composite cemented carbide drawing die is prepared, ball milled for 24 hours, and then unloaded, dried, mixed with glue according to the conventional cemented carbide production method, and the matrix mixture is prepared for use, while the working area and the sizing area The cemented carbide mixture used is prepared according to the corresponding YG8 brand process.

[0017] B. Determine the volume (or size) ratio and pressing conditions of the two-layer materials: the volume ratio of the substrate and the YG8 cemented carbide two-layer material is 15%, and the pressure test conditions are: substrate unit weight / YG8 cemented carb...

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PUM

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Abstract

The invention discloses a layered composite hard alloy drawing die for drawing metal wires, bars, pipes and section materials. The working area (reducing area) and sizing area of the drawing die comprise a tungsten carbide-based hard alloy layer, and the non-working area comprises a specially prepared matrix layer, the two layers are compounded by the powder metallurgic process which causes the interface between the two layers to transit continuously without defect. The use effect is the same as that of a monolayer homogeneous hard alloy drawing die, and the layered composite hard alloy drawing die can greatly save W and Co resources, reduce the cost of raw materials, and has the advantages of simple production implementation and high efficiency.

Description

technical field [0001] The invention relates to the field of hard alloy products, and in particular provides a layered composite hard alloy drawing die used in the field of drawing metal wires, rods, tubes and profiles. Background technique [0002] The commonly used cemented carbide drawing die is a uniform single-layer structure sintered material made of WC-Co material by powder metallurgy method, and the single-layer structure cemented carbide needs to consume a large amount of W and Co resources, which are scarce and Expensive, high cost of raw materials. In practical application, the cemented carbide drawing die only produces wear in the contact friction between the surface of the working area (reducing diameter area) and the sizing area and the workpiece. Therefore, compounding a layer of cemented carbide material suitable for stretching in the working area and the fixed warp area can achieve the same effect as that of a uniform single-layer structure cemented carbide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C3/02B21D37/12B21D37/01B22F3/16
Inventor 罗达成何跃进
Owner 罗达成
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