CN-121992269-A - Self-repairing metal ceramic cutter material for cast iron processing and preparation method thereof

Abstract

The invention discloses a self-repairing metal ceramic cutter material for cast iron processing and a preparation method thereof, belonging to the technical field of metal ceramic cutters. The cutter material has the multiple functions of automatically inducing Al, S and Si in cast iron of a workpiece to be processed to expand towards the surface of the cutter, forming a coating layer with self-lubricating and wear-resisting functions on the surface of the cutter in situ, realizing dynamic balance of cutter wear and self-repairing, and simultaneously realizing reduction of comprehensive performance lossy elements Al, S and Si in the cast iron workpiece to be processed. The cutter material does not contain Ta and Nb, and can obviously reduce the production cost. The invention solves the problems of high cost, difficult purification of harmful elements of processed materials, short service life of a metal ceramic cutter when used for rough machining and the like of the traditional cutter through the adaptation design of raw materials, components and preparation processes and the regulation and control of magnetic properties, and has the advantages of low cost, long service life and optimal machining performance.

Inventors

• WANG SHIYANG
• ZHANG LI

Assignees

• 嘉兴鸷锐新材料科技有限公司

Dates

Publication Date

20260508

Application Date

20260324

Claims (3)

1. 1. A self-repairing metal ceramic cutter material for cast iron processing is characterized in that a processed object matched with the cutter material is cast iron, the cutter material does not contain Ta and Nb, the cutter material has the following component characteristics of Ti (C x ,N 1-x )-15~25%WC-3~5%Mo 2 C-0.8~1.5%Cr 3 C 2 -13-18% (Co-Ni), wherein the balance of Ti (C x ,N 1-x ) is x=0.5 or 0.6, the mass fraction ratio of Co/Ni is 1-2, the coercive force of the cutter material is 8.00-12.00 kA/m, the cobalt magnetism is 4.00-6.00%, namely, the cobalt magnetism is saturated, al, S and Si in a cast iron processed piece are independently induced to expand to the surface of a cutter in the cast iron processing process, a coating layer with self-lubricating and wear-resisting functions is formed on the surface of the cutter in situ, the dynamic balance of cutter abrasion and self-repairing is realized, and meanwhile, the reduction of elements Al, S and Si with the comprehensive performance of the cast iron processed piece is realized; The magnetic performance of the cutter material is controlled, namely, the coercive force is 8.00-12.00 kA/m, and the cobalt magnetism is 4.00-6.00%, and the control is realized by the following preparation method: The method comprises the steps of A, selecting raw materials, namely Ti (C x ,N 1-x )、Mo 2 C、Cr 3 C 2 and Co raw material powder with the Fisher particle size not larger than 1.5 mu m, carbonyl Ni raw material powder with the Fisher particle size not larger than 2.5 mu m, WC raw material powder with the specific surface area average particle size not larger than 0.3 mu m, and selecting the total carbon content of Ti (C x ,N 1-x ) according to the selection standard that the total carbon content reaches 95% -98% of the theoretical carbon content, wherein the selection standard of other various carbides is that saturated carbon control requirements are required to be met, namely the total carbon content is required to reach the theoretical carbon content; The preparation of the wet grinding mixture comprises the steps of adopting alcohol as a wet grinding medium and adopting PEG6000 and PEI70000 as a forming agent and a dispersing agent, wherein the PEG refers to polyethylene glycol and the PEI refers to polyethyleneimine, and the average molecular weights of the PEI are 6000 and 70000 respectively; The method comprises the steps of removing a forming agent and a dispersing agent and sintering an alloy, wherein the forming agent and the dispersing agent are removed and the alloy is sintered in a pressure sintering furnace with a rapid cooling function, after the forming agent is removed, vacuum sintering is carried out, when the temperature is raised to 1350-1400 ℃, high-purity argon is introduced to enable the pressure in the sintering furnace to reach 5-8 kPa, the pressure is kept until the temperature in the sintering furnace reaches the sintering temperature of 1490-1510 ℃, the temperature is kept for 15-20 minutes at 1490-1510 ℃ and then high-purity argon is continuously introduced to enable the pressure in the sintering furnace to be raised to 2.0-5.5 MPa, the heat-keeping time of the pressure sintering is 50-70 minutes at 1490-1510 ℃ and 2.0-5.5 MPa, after the sintering heat-keeping is completed, the rapid cooling function of the sintering furnace is invoked, the temperature in the furnace is cooled to 1200 ℃ within 1 hour, and then the furnace is cooled to the tapping temperature below 70 ℃.
2. 2. The self-repairing cermet tool material for cast iron processing according to claim 1, wherein in the step B of the preparation method, the ratio of PEG6000 to PEI70000 in the total mass fraction of the powder is 2.0-2.3% and the ratio of PEI70000 in the total mass fraction of the powder is 0.05-0.1%, respectively.
3. 3. The self-repairing metal ceramic cutter material for cast iron processing according to claim 1, wherein in the preparation method step B, a rolling ball mill is adopted, the mass ratio of the hard alloy grinding balls to the mixture is (4:1) - (5:1), and the wet grinding time is 60-72 hours.

Description

Self-repairing metal ceramic cutter material for cast iron processing and preparation method thereof Technical Field The invention belongs to the technical field of metal ceramic cutters, and particularly relates to cutting processing of a self-repairing metal ceramic cutter material for cast iron processing. Background The Ti (C, N) -based cermet has low demand for strategic key metal W, has toughness of metal materials and high hardness and high wear resistance of ceramic materials, and has been successfully applied as a cutting tool in the field of machining. The core advantages of the method are represented by excellent high-speed finish machining performance, particularly in semi-finish machining and finish machining procedures of steel parts and cast iron, excellent machining surface quality and longer tool life can be obtained, but the method is limited by larger brittleness and is difficult to meet the requirements of rough machining working conditions. Gray cast iron is a commonly used structural material in machine manufacturing, and has high requirements on impact resistance and strong abrasion resistance of a cutter in the rough machining process. Thus, CVD coated cemented carbide tools are commonly used for cast iron roughing. In the prior art, in order to improve the wear resistance and the service life of a Ti (C, N) -based cermet cutter, rare metal carbides such as Ta, nb and the like are usually added into cutter materials, and the addition of the rare metal carbides can improve the cutter performance, but can obviously increase the cutter production cost. Meanwhile, when the traditional uncoated hard alloy cutter is used for cutting cast iron, alloy components in a machined workpiece diffuse to the surface of the cutter, so that formation of accumulated chippings is often caused, the accumulated chippings can cause the cutter to be worn and the machining precision to be reduced, and the service life of the cutter is further shortened. In addition, the existing cutter material is difficult to effectively reduce the comprehensive performance loss elements in the processed material through the self-action, and the synchronous improvement of the performance of the processed material is difficult to realize. Therefore, developing a metal ceramic tool material which does not need to add Ta and Nb elements, has low cost, can effectively avoid the formation of accumulated dandruff, realize self-repairing, prolong the service life and improve the performance of processed materials is a technical problem to be solved in the current field. Meanwhile, the comprehensive performance of Ti (C, N) -based metal ceramic is improved, so that the rough machining of a machined part can be well realized, and the technical problem to be solved in the field is also needed. Disclosure of Invention The invention aims to develop a tool material capable of replacing a CVD coating hard alloy, reduce the production cost of a cutting tool in the cast iron processing prior art, solve the series of problems that Ti (C, N) -based cermet is difficult to meet the requirement of rough machining on the comprehensive performance of the tool, prolong the service life of the tool and improve the comprehensive performance of a machined workpiece. In order to achieve the aim, the self-repairing metal ceramic cutter material for cast iron processing is a cast iron, a processed object which is adapted to the cutter material is cast iron, the cutter material does not contain Ta and Nb, the cutter material has the following component characteristics that Ti (C x,N1-x)-15~25%WC-3~5%Mo2C-0.8~1.5%Cr3C2 -13-18% (Co-Ni), wherein Ti (C x,N1-x) is the balance, x=0.5 or 0.6, the mass fraction ratio of Co/Ni is 1-2, the coercive force of the cutter material is 8.00-12.00 kA/m, the cobalt magnetism is 4.00-6.00%, the cobalt magnetism is saturated, namely, the magnetic saturation is a measurement result obtained by taking the specific saturation magnetization of pure cobalt as a reference value according to the prior national standard, the cutter material is formed by autonomously inducing Al, S and Si in a processed piece of cast iron to expand towards the surface of a cutter in the process of processing cast iron, a coating layer with self-lubricating and wear-resisting functions is formed on the surface of the cutter in situ, so that the dynamic balance of cutter wear and the self-repairing is realized, and the reduction of the comprehensive performance elements such as Al, S and Si in the processed piece are reduced simultaneously; The magnetic performance of the cutter material is controlled, namely, the coercive force is 8.00-12.00 kA/m, and the cobalt magnetism is 4.00-6.00%, and the control is realized by the following preparation method: The method comprises the steps of A, selecting raw materials, namely Ti (C x,N1-x)、Mo2C、Cr3C2 and Co raw material powder with the Fisher particle size not larger than 1.5 mu m, carbonyl Ni raw material p