Acetylene flame surface quenching method for frame structure cast iron pressing mold

A technology for pressing molds and frame structures, which is applied in the field of acetylene flame surface quenching of cast iron pressing molds, can solve problems such as deformation and easy cracking, and achieve the effects of small temperature difference, not easy to crack, and eliminating residual stress.

Inactive Publication Date: 2011-04-27
FAW GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides an acetylene flame surface quenching method for frame structure cast iron pressing molds to solve the problems of deformation and easy cracking of large cast iron frame structure pressing molds during heat treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Preheating before heat treatment: the time is 140°C, the temperature is 5 hours, and then the mold is taken out and fixed on the flat plate of the CNC machine tool;

[0018] (2) Use two flame quenching guns to start quenching at the symmetrical center of the mold geometry at the same time, move forward to both sides at the same speed, and end quenching when reaching the same end point;

[0019] (3) After the mold is cooled to room temperature, remove the fixed platen, send it back to the furnace for tempering, the temperature is 140°C, and the temperature is 5 hours, and it is cooled to room temperature with the furnace.

[0020] The flame quenching method is:

[0021] Selection of welding torch and nozzle: medium size H01, 3# nozzle,

[0022] Pressure adjustment of oxygen and acetylene gauge: oxygen 0.5Mpa, acetylene 0.05Mpa,

[0023] Adjustment of the flame: the flame is adjusted to be a neutral flame or a slight oxidizing flame, the length of the flame core is ...

Embodiment 2

[0029] (1) Preheating before heat treatment: the time is 160°C, the temperature is 4 hours, and then the mold is taken out and fixed on the flat plate of the CNC machine tool;

[0030] (2) Use two flame quenching guns to start quenching at the symmetrical center of the mold geometry at the same time, move forward to both sides at the same speed, and end quenching when reaching the same end point;

[0031] (3) After the mold is cooled to room temperature, remove the fixed platen, send it back to the furnace for tempering at 160°C for 4 hours, and then cool to room temperature with the furnace.

[0032] Flame quenching method of the present invention is:

[0033] Selection of welding torch and nozzle: medium size H016, 4# nozzle,

[0034] Pressure adjustment of oxygen and acetylene gauge: oxygen 0.6Mpa, acetylene 0.06Mpa,

[0035] Adjustment of the flame: the flame is adjusted to be a neutral flame or a slight oxidizing flame, the length of the flame core is 10mm,

[0036] He...

Embodiment 3

[0040] (1) Preheating before heat treatment: time 180°C, temperature 3 hours, then take out the mold and fix it on the CNC machine tool plate;

[0041] (2) Use two flame quenching guns to start quenching at the symmetrical center of the mold geometry at the same time, move forward to both sides at the same speed, and end quenching when reaching the same end point;

[0042] (3) After the mold is cooled to room temperature, remove the fixed platen, send it back to the furnace for tempering, the temperature is 180°C, and the temperature is 3 hours, and it is cooled to room temperature with the furnace.

[0043] Invention flame quenching method is:

[0044] Selection of welding torch and nozzle: medium size H12, 5# nozzle,

[0045] Pressure adjustment of oxygen and acetylene gauge: oxygen 0.7Mpa, acetylene 0.07Mpa,

[0046] Adjustment of the flame: the flame is adjusted to be a neutral flame or a slight oxidizing flame, the length of the flame core is 15mm,

[0047] Heating met...

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PUM

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Abstract

The invention relates to an acetylene flame surface quenching method for a frame structure cast iron pressing mold, belonging to an acetylene flame surface quenching method for a cast iron pressing mold. The method comprises the following steps: preheating at 140-180 DEG C for 3-5 hours, using two flame quenching lances to simultaneously quench the symmetry center of the geometric shape of a mold, advancing at the same speed at both sides, and finishing quenching when reaching the same end point; and removing fixed pressure plates when the mold is cooled to room temperature, tempering at 140-180 DEG C in a furnace for 3-5 hours, cooling to room temperature in the furnace, and discharging. The preheated mold has less temperature difference and less deformation in the quenching process; the symmetrical quenching process ensures that the mold can not be subject to torsional deformation; and the tempering process eliminates the residual stress, thereby preventing deformation and cracking.

Description

technical field [0001] The invention belongs to an acetylene flame surface quenching method of a cast iron pressing mold. Background technique [0002] With the rapid development of the mold manufacturing industry, the heat treatment technology of the mold is also improving, but there are certain difficulties in the local surface heat treatment of the frame structure cast iron (GGG70L) compression mold. The quenching area of ​​this kind of mold is mostly a symmetrical ring, and deformation and cracking are particularly easy to occur during surface heat treatment. Cause cracking, there is no better solution at present. Contents of the invention [0003] The invention provides an acetylene flame surface quenching method for a frame structure cast iron pressing die to solve the problems of deformation and easy cracking of a large cast iron frame structure pressing die during heat treatment. [0004] The technical scheme that the present invention takes is, comprises the fol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/08
Inventor 沈喜堂隋志华
Owner FAW GROUP
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