Carbide wire drawing die operations in the damage
Extending the failure of the carbide drawing die can usually find the following types of damage: longitudinal, transverse, core, run, normal wear and tear, summed up the reasons for several damage analysis is as follows:
Longitudinal: Carbide core of the cylindrical outer processing, mold sleeve hole processing quality is poor, tapered hole, trapezoidal hole, inlaid enough, geometric angle is unreasonable, the amount of compression is too large, carbide defects Or grade selection is not appropriate, the material tensile strength is not enough.
Cross-section: carbide outer circumscribed, mold sets of holes in the processing of poor quality, was ladder-like, inlaid up and down different contacts, carbide defects, improper selection of grades, material tensile strength is not enough;
Runway: Carbide material is not wear, lubrication is not good when drawing;
Core: inks almost no interference, mold sets of poor quality materials;
In summary, summarized as carbide materials (quality defects, grade selection) reasons, mold processing, manufacturing reasons and mold sets of material reasons. In the present situation, the quality of the carbide material of the drawing die is improved, including reasonable grade selection, material design, ensuring high abrasion resistance, high tensile strength uniformity, reasonable hole design (lubrication area, working area, Positioning area, export angle, size design) is to improve the overall level of drawing the key.
Carbide Drawing Die Wear Mechanism
Stretched high carbon steel, especially high carbon steel, spring steel, special hard steel, high viscosity alloy steel and the like, the use of WC / Co type carbide is often expressed as wear resistance or tensile strength is not enough, life is very not ideal.
When such materials are stretched, the interface adheres and diffuses. Since the diffusion of Fe from the material at the interface of such materials to the cemented carbide occurs, the diffusion rate of Fe is weaker due to the higher carbon content of the stretched material, and the Co in the alloy The diffusion is unusually strong due to the high carbon content of the material. The strong diffusion of cobalt makes the alloy abruptly worn, thereby weakening the WC / Co bond on the surface of the cemented carbide.
The loose WC phase is pulled away by the abrasive material. In the absence of cooling dry grinding conditions, this wear and tear will often be due to thermal fatigue effect and speed up.
In view of the wear of cemented carbide tensile material is mainly due to the diffusion of cobalt when the high carbon material consumption, weakened the WC / Co caused by the bond, so inhibit or prevent such Co diffusion is to solve such materials wear, The key to its life.
Carbide die is the life of steel mold ten times or even several times, carbide mold only high hardness, high strength, corrosion resistance, high temperature and expansion coefficient is small, are generally used tungsten cobalt carbide. Casting casting process will encounter a lot of problems, such as: 1, filling conditions, gate
Carbide die is the life of steel mold ten times or even several times, carbide mold only high hardness, high strength, corrosion resistance, high temperature and expansion coefficient is small, are generally used tungsten cobalt carbide.
Casting casting process will encounter a lot of problems, such as:
1, fill the poor conditions, gate location, diversion way, the number of gate to choose improperly, or the gate cross-sectional area is too small to form a large flow resistance.
2, metal liquid and mold temperature is too low.
3, pouring volume is insufficient.
4, poor exhaust.
5, there are mold cavity cavity residue.
Carbide mold features are particularly prominent in the technical field
1, the designer benefits: the use of rapid prototyping technology, the designer in the initial stages of the design can get real product samples, in a single parts and assembly parts level, the product design checks and optimization, and in the Different stages of rapid changes, redo the sample, and even make trial production tool and a small amount of products, which will give designers to create a good design ring mirror, to provide a fast, powerful physical simulation means, without repeated thinking, Modify, you can get as soon as possible to optimize the results, which can significantly shorten the design cycle and reduce costs.
Carbide products are to miniaturization, precision direction. Foreign manufacturers continue
Improve its product accuracy, many carbide die size accuracy has reached the micron level, or even reached
Ultra-micron level. This marks the carbide industry has entered the stage of product precision.
2, the manufacturer benefits: the manufacturer in the initial stages of product design can also get real product samples, and even trial production of spiral molds and a small amount of products, which makes them early on product design advice, good raw materials, standards Processing, processing and mass production of drawing dies and other preparatory work, to minimize errors and rework, greatly saving time, reduce costs and improve product quality.
3, the seller benefited: the seller in the initial stages of product design can also get real product samples or even a small amount of products, which makes them rush to this, and really to the user publicity and comments, as well as more accurate market Demand forecasts, rather than just abstract product descriptions or drawings, samples to sell.
4, the user benefits: the user in the initial stage of product design, but also to see product samples and even a small amount of products, which allows users to early and profound understanding of the product, the necessary testing, and timely comments, which can be as short as possible Of the time, with the most reasonable price to get the most qualified products. |
