Heat treatment process of stone cutting saw blade

Abstract

The invention discloses a heat treatment process of a stone cutting saw blade. The heat treatment process comprises the following steps: (1) blanking, forging and preheating treatment; (2) preserving heat; (3) oil quenching; (4) shaping and tempering: performing uniform shaping and tempering, namely performing common tempering for 2 hours, and performing uniform tempering for 4 hours; (5) cryogenic treatment:-60 DEG C cold treatment is adopted, the cooling rate is 0.25-0.5 DEG C / min, and the cold treatment time is 4-6 h; and (6) low-temperature tempering is conducted, specifically, the saw blade is taken out after being subjected to subzero treatment, and after the surface temperature of the saw blade returns to the room temperature, low-temperature tempering is conducted for 4-6 h. According to the heat treatment process of the stone cutting saw blade, the traditional quenching and tempering procedures are broken through, and shaping and tempering are updated; in order to prolong the service life and improve the mechanical property, a new cold treatment process is added; and in the aspect of a cold treatment mechanism, deformation is reduced, retained austenite is eliminated, the comprehensive mechanical property of a steel material subjected to cold treatment is obviously improved, and the wear resistance and the service life of a cutter are greatly improved after cold treatment.

Description

technical field

[0001] The invention relates to a heat treatment process of a stone cutting saw blade, and belongs to the technical field of heat treatment process of a stone cutting saw blade. Background technique

[0002] As a high-grade building decoration material, stone is widely used in indoor and outdoor decoration design, curtain wall decoration and public facilities construction. Stone is one of the indispensable building materials in urban construction, and its consumption is very large. And processing stone is inseparable from stone processing tools-cutting stone saw blades. The quality of saw blades directly affects work efficiency, so the quality of saw blades is very important.

[0003] The stone cutting saw blade (65Mn saw blade) widely used in China at present has the following deficiencies: poor heat resistance, general toughness and wear resistance, and extremely easy to damage. The reason is that the performance of the base material of the stone cutting ...

Examples

Embodiment 1

[0033] Embodiment 1 The heat treatment process of the stone cutting saw blade

[0034] The steps are as follows (such as figure 1 shown):

[0035] (1) Cutting, forging, and preheating treatment: hoist the 70 spring steel saw blade equipped with fixtures on the hanger for hanging and burning, put it into the well-type gas protection furnace, and drip protection (drip methanol protection, 60 drops / min), heating uniformly without oxidation, heating at 100°C / h to the optimum quenching heating temperature of 780°C (Ac1+50°C);

[0036] (2) Heat preservation: the heat preservation time is calculated as 1min / mm, plus 20min / furnace, and it is baked out after being thoroughly baked;

[0037] (3) Oil quenching: the quenching temperature is selected at Curie point 768°C and then quenched after loss of magnetism. The purpose is to refine austenite, control the grade of austenite grains, and hinder the growth of grains; evenly heat, and the oil temperature is controlled at 80 Within ℃, ...

Embodiment 2

[0044] Embodiment 2 Traditional 65Mn thermal processing technology

[0045] The steps are as follows (such as figure 2 shown):

[0046] Normalizing: Normalizing temperature 880℃;

[0047] Oil quenching: the quenching temperature is 850°C±15°C, the oil temperature is controlled within 80°C, the spreader comes out of the furnace, puts oil into it, moves it into the quenching press, pressurizes and cools down to room temperature;

[0048] Tempering at medium temperature: control the tempering temperature at 420°C and temper for 2 hours.

[0049] According to the traditional technique (Example 2) and the technique of the present invention (Example 1), four kinds of stone saw blades were trial-manufactured respectively. After testing and comparison, the performance was improved, and the qualified rate was increased by 80%. As we all know, the blade should have sufficient strength and hardness to maintain the wear resistance of the blade. After setting tempering and cryogenic tr...

technical field

[0001] The invention relates to a heat treatment process of a stone cutting saw blade, and belongs to the technical field of heat treatment process of a stone cutting saw blade. Background technique

[0002] As a high-grade building decoration material, stone is widely used in indoor and outdoor decoration design, curtain wall decoration and public facilities construction. Stone is one of the indispensable building materials in urban construction, and its consumption is very large. And processing stone is inseparable from stone processing tools-cutting stone saw blades. The quality of saw blades directly affects work efficiency, so the quality of saw blades is very important.

[0003] The stone cutting saw blade (65Mn saw blade) widely used in China at present has the following deficiencies: poor heat resistance, general toughness and wear resistance, and extremely easy to damage. The reason is that the performance of the base material of the stone cutting ...

Examples

Embodiment 1

[0033] Embodiment 1 The heat treatment process of the stone cutting saw blade

[0034] The steps are as follows (such as figure 1 shown):

[0035] (1) Cutting, forging, and preheating treatment: hoist the 70 spring steel saw blade equipped with fixtures on the hanger for hanging and burning, put it into the well-type gas protection furnace, and drip protection (drip methanol protection, 60 drops / min), heating uniformly without oxidation, heating at 100°C / h to the optimum quenching heating temperature of 780°C (Ac1+50°C);

[0036] (2) Heat preservation: the heat preservation time is calculated as 1min / mm, plus 20min / furnace, and it is baked out after being thoroughly baked;

[0037] (3) Oil quenching: the quenching temperature is selected at Curie point 768°C and then quenched after loss of magnetism. The purpose is to refine austenite, control the grade of austenite grains, and hinder the growth of grains; evenly heat, and the oil temperature is controlled at 80 Within ℃, ...

Embodiment 2

[0044] Embodiment 2 Traditional 65Mn thermal processing technology

[0045] The steps are as follows (such as figure 2 shown):

[0046] Normalizing: Normalizing temperature 880℃;

[0047] Oil quenching: the quenching temperature is 850°C±15°C, the oil temperature is controlled within 80°C, the spreader comes out of the furnace, puts oil into it, moves it into the quenching press, pressurizes and cools down to room temperature;

[0048] Tempering at medium temperature: control the tempering temperature at 420°C and temper for 2 hours.

[0049] According to the traditional technique (Example 2) and the technique of the present invention (Example 1), four kinds of stone saw blades were trial-manufactured respectively. After testing and comparison, the performance was improved, and the qualified rate was increased by 80%. As we all know, the blade should have sufficient strength and hardness to maintain the wear resistance of the blade. After setting tempering and cryogenic tr...

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