The method of hardening the cutting tool

 

The invention relates to the field of engineering, in particular to thermal processing of steel products in concentrated source of energy. The technical result of the invention is to reduce the energy intensity of the process and increase the quality of the tool. To achieve a technical result of the first product is subjected to volumetric hardening, then high-energy induction heating of the cutting edges at a frequency of 440 kHz when the specific power of 5-10 kW/cm2within 1-2 with, leaving the bulk metal tool cold, and cooling the heated edges of the jet of water at an initial pressure of 2-2 .5 ATM. table 1.

The invention relates to thermal processing of steel products are concentrated sources of energy, specifically, induction heating, and can be used in mechanical engineering in the manufacture of cutting tools.

The known method of induction hardening tool, comprising induction heating of the product during the few seconds when the specific power level of 1 kW/cm2up to the hardening temperature and subsequent cooling in oil or water-based polymeric environment [1].

The disadvantage of this method is the high solid the am and the output of the tool inoperable. The decrease in hardness of the product during induction heating leads to wrinkling of the cutting edges during operation. While the power of the HF generator is 60 kW.

Closest to the proposed invention is a method of induction hardening of the cutting edges of steel products with a carbon content of 0.55 to 1.2)% by induction heating for hardening the entire cutting edge currents with a frequency of 8-10 kHz for 8 with subsequent cooling in a quenching medium [2]. As a result, at depths of 2 mm, hardened zone get dispersed martensite with a hardness of more than 60 Re.

The disadvantage of the prototype are low specific power induction heating (up to 1 kW/cm2), the length of time of heating. When the desired depth of hardening of the cutting edges of the pliers and diagonal cutters of the order of 1 mm blade width at this depth is about 1 mm, which is much less than the depth of the skin layer at frequencies (8-10) kHz, and the use of these frequencies to heat dramatically reduces the efficiency of the process, increasing energy costs.

Application for induction heating of the cutting edges of the narrow blades of the pliers and wire cutters, the specific capacities of the order of 1 kW/cm2leads to large time heat and high energy losses due to removal approchant cutting tool, including the initial volumetric hardening, heat cutting edges and cooling (see SU 1747408 A1, IPC 7 To 21 D 8/09, 15.07.1992).

Object of the invention is to reduce the energy intensity of the process and increase the quality of the tool, such as pliers and wire cutters, by ensuring that all over the cutting edge patterns of dispersed martensite to a depth of not less than 1 mm when the hardness of the hardened layer is not less than 60 Rewhile the core part of the tool has a hardness (35-36) Re.

This object is achieved in that the conduct of the initial volumetric hardening of the entire product, then high-energy induction heating of the cutting edges at a frequency of 440 kHz, when the specific power of 5-10 kW/cm2within 1-2 with, leaving the bulk metal tool cold, and subsequent cooling of the heated edges of the jet of water at an initial pressure of 2-2 .5 ATM.

These characteristics have been identified in other technical solutions in the study of the level of the art and, therefore, the decision is novel and involves an inventive step.

The method is as follows.

First by oven volumetric hardening lots of products (material - steel grades a, AA, HP) on hardness (35-36) Rethen heat 5-10 kW/cm2and the operating frequency of 440 kHz, leaving the bulk of the product cold. After heating the cutting edges of each product within 1-2 with immediately produce cooling of the edges with water using a water jet with an initial pressure of at least 2 ATA.

When the operating frequency of 440 kHz depth hot skin layer is of the order of 1 mm, which allows to optimally carry out the process. To increase the specific power of 5-10 kW/cm2and heating of the edges within 1-2 to provide rapid heating of the cutting edges for hardening at low heat in the bulk of the product. For efficient heating of the cutting edges of complex shape and hardening them to a depth of 1-1,5 mm using an inductor with a ferrite energy hubs [3] and flat working area, overlapping cutting edges on their whole length, with widths up to 6 mm the table shows the comparative characteristics of traditional induction method of hardening of pliers and diagonal cutters (column 2) and the proposed method (column 3).

The proposed method can dramatically reduce waste and energy consumption of the process.

Sources of information 1. Heat treatment in mechanical engineering. The Handbook. // M: Mechanical Engineering, 1980.

2. A. C. Shestakov, S. S. Iskhakov, A. A. Kuznetsov et al. Ed. with the 1, 21 D 8/09, 15.07.1992 prototype.

Claims

The method of hardening tool, including the initial volumetric hardening tool, heating the cutting edges and cooling, characterized in that conduct high-energy induction heating of the cutting edges at a frequency of 440 kHz, at a power density of 5-10 kW/cm2within 1-2 with, leaving the bulk metal tool cold and cooling the cutting edges are jet of water at an initial pressure of 2-2 .5 ATM.

 

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