Steel tool or carbide tool treatment method

FIELD: metallurgy.

SUBSTANCE: steel tool or carbide tool treatment method involves application of diffusion coating by saturation of steel or carbide tool in eutectic lead-lithium melt with addition of copper and nickel so that the coating is obtained. After application of coating the tool is strengthened by its being aged on material with hardness of 10 to 18 HRCe at value of contact stresses of 2000 to 5000 MPa during 2-5 minutes.

EFFECT: obtaining the coating having high stability to adhesion hardness, mechanical abrasion and deformation at maintaining positive operating properties of nickel-copper coating.

2 tbl, 2 ex

 

The invention relates to technologies that enhance the stability of cutting and punching tools due to changes in the composition and structure of their surface layers, and can be used to increase the service life of the instrument, increasing productivity and quality of processing.

Known methods of increasing the performance of the instrument due to changes in the composition and structure of surface layers by diffusion saturation of the surface of the tool in the process of chemical-heat treatment of the elements of the implementation (nitration, retracements and others), welding, plating alloys specified composition: plasma-arc welding, plasma spraying, finishing plasma spraying, as well as physical and chemical methods of deposition of elements from gas, steam, liquid and solid phases [Instrumental materials. Educational. manual / Gasarabwe, Sea, Appleone, Vcharovi. - SPb.: Polytechnic, 2005. 268 C.]. The lack of technology chemical-thermal treatment is that they in most cases increase the fragility of the instrument. Surfacing and spraying does not provide a solid connection of the coating to the substrate, and is characterized by the irreversible loss applied to the surface of the tool material. General shortcomings of the physical and chemical the fir methods of deposition are the complexity of the technological process, the high cost technological equipment and technological complexity of forming a uniform coating on all surfaces of the product.

Closest to the claimed invention is patent No. 2271265 of the Russian Federation, IPC B23B 27/00 (2006.01). "Tool for metal cutting and pressure". According to this patent, the surface of the tool applied diffusion hardening Nickel-copper coating obtained by diffusion saturation in the melt eutectic alloy lead-lithium with additions of copper and Nickel, at a temperature of 1000-1200°C.

Application of diffusion Nickel-copper coatings on tool, having a low coefficient of friction, low tack with the processed material, high thermal conductivity and snowpocalypse effect, increase tool life, productivity and quality of processing.

The disadvantage of the prototype is the low initial hardness, and hence the wear resistance of the diffusion of the Nickel-copper coatings that may in the processing of alloys with solid-phase inclusions, or hardness of more than 30 HRCeto cause wear of the coating prior to the onset of the effect of work hardening of the coating.

The task of the invention is to increase the resistance to wear of Nickel-copper coatings deposited on the surface in the machining alloys, has a hardness of more than 30 HRCeor with solid-phase inclusions.

The technical result is an increase tool life, as well as the quality and performance when processing their alloys having a hardness of more than 30 HRCeand also alloys with solid-phase inclusions.

The problem is solved in that in the claimed method of treatment of tool steel or carbide, including the application of diffusion coatings by saturation of tool steel or carbide eutectic alloy in the molten lead-lithium with the addition of copper and Nickel to obtain coverage, wherein after coating carry out his hardening by running the tool on the material hardness of from 10 to 18 HRCewhen the magnitude of the contact stresses from 2000 to 5000 MPa, within 2 to 5 minutes.

With the introduction of the technological cycle of production tool hardening stage covered running the tool on the material hardness of from 10 to 18 HRCe(the hardness of the material is close to the hardness of the Nickel-copper plating after plating), the diffusion of the Nickel-copper will work harden by covering, its microhardness is increased to 6000 7000...MPa, and when this is not observed erosion ablation of the coating material. Formed as a result of the running-in treatment is their has a high resistance to adhesive hardening, mechanical abrasion and deformation while maintaining the positive performance properties, which have Nickel-copper coating.

Thus, with the introduction of the technological cycle stage running significantly expands the range of treatable alloys, the performance increase, the quality and durability of the tool.

Example 1. Conducted experimental turning bars of steel HMF hardness 40 HRCewhen the cutting speed 100 m/min, depth of cut 2.5 mm, feed 0.2 mm/Rev cutters with carbide inserts brand T15K6 coated with Nickel-copper coatings in molten lead + Li + copper + Nickel at a temperature of 1100°C. the First party incisors with coated carbide inserts were turning without hardening break-in (the prototype), and the second party incisors with covered plates before turning was subjected to hardening pererabotka by turning heat-treated steel 40 hardness 10 HRCeand 18 HRCewhen the cutting speed of 20 m/min, cutting depth was 5 mm, and the feed was changed, providing the contact stresses in the cutting zone 2000 MPa To 5000 MPa.

The results are given in table 1.

Table 1
The parameters of the running-inThe period of tool life, minThe surface roughness, Ra, mcm
The hardness of the processed material, HRCeContact stress in the cutting zone, MPaTime running
110200051100,75
218500021200,67
3the placeholder900,93

Hardening of extra income increased resistance cutters 1.3 times and reduced roughness Ra0.26 ám.

Example 2. Comparative test to determine effect of hardening running on tool life and the quality of treatment was subjected cutters high speed steel R6M5 with Nickel-copper coatings without hardening break (prototype) and with it (declared with the royals). The research was carried out by turning the dispersion-strengthened composite material on an aluminum basis, SAP-3. Modes turning: cutting speed 100 m/min, cutting depth of 5 mm, a feed of 0.1 mm/Rev..

Hardening breaking blades with Nickel-copper coating was carried out on 40 steel with a hardness of 15 to HRCewhen the cutting speed of 20 m/min, cutting depth was 5 mm, the contact stresses in the cutting zone 3000 MPa.

The results are given in table 2.

Table 2
№ p/pThe parameters of the running-inThe period of tool life, minThe surface roughness, Ra, mcm
The hardness of the processed material, HRCeContact stress in the cutting zone, MPaTime running
115300051300,65
2the placeholder0,95

Hardening of extra income increased resistance cutters 1.6 times and reduced roughness Raat 0.3 microns.

The method of processing of tool steel or carbide, including the application of diffusion coatings by saturation of tool steel or carbide eutectic alloy in the molten lead-lithium with the addition of copper and Nickel to obtain coverage, wherein after coating shall hardening tool by running on the material hardness of from 10 to 18 AUCewhen the magnitude of the contact stresses from 2000 to 5000 MPa for 2-5 minutes



 

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