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Immersion oil quench cooling method adopting plurality of sections for bubble emission

A cooling method and oil immersion technology, used in heat treatment equipment, furnaces, heat treatment furnaces, etc., can solve the problems of workpiece quenching deformation hardness, unqualified, etc., and achieve the effect of improving fatigue life, improving internal quality, and reducing quenching distortion.

Active Publication Date: 2015-10-28
BEIJING HUALI FINE CHEM CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, on the one hand, in view of the characteristics of medium stirring and the complexity of stirring problems, it is impossible to obtain the same cooling effect by placing different workpieces quenched in the same furnace, or different parts of the same workpiece in quenching oil with uniform temperature at the same time; On the other hand, due to the influence of the shape and position of the workpiece, the uniformity of the temperature of the quenching oil does not mean the uniformity of the quenching hardness of the workpiece. question

Method used

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  • Immersion oil quench cooling method adopting plurality of sections for bubble emission
  • Immersion oil quench cooling method adopting plurality of sections for bubble emission
  • Immersion oil quench cooling method adopting plurality of sections for bubble emission

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0048] Experimental example 1. Comparison of cooling time

[0049] Take two samples, one is sample 1a without separator ring, the other is sample 1b with separator ring, the size is Φ30cm×135cm, the shape of the axial section of the separator ring is trapezoidal, the upper part is a horizontal plane, and the lower part is an inclined plane , the thickness of the base is 2mm, the thickness of the top is 1mm (the thickness of the top refers to the length of the farthest distance between the separator ring and the workpiece in the axial direction), the height is 3mm, and the distance between the separator rings is 25mm. Quenching cooling in the oil. Figure 7-Figure 9 The state change of these two samples 1a and 1b during quench cooling is shown. Figure 7 and Figure 8 They are four state diagrams of sample 1a without separator ring and sample 1b with separator ring at different moments during the cooling process, Figure 9 It is the extended diagram of the boundary line of t...

experiment example 2

[0050] Experimental example two, comparison of quenching hardness

[0051] Use the same 45# steel bar to process a sample 2b with a separator ring and a sample 2a without a separator ring. The base size of the sample is Ф20×135cm, except that there are four more spacer rings on the sample 2b with spacer rings, and the shape, size and spacing of the spacer rings are the same as those in Experimental Example 1. After being heated to 850°C under the same conditions, both are cooled vertically in the same rapid quenching oil. Figure 10 The left figure of the figure is the expanded boundary diagram of sample 2a without a separator ring, and the right figure is the expanded boundary diagram of sample 2b with a separator ring.

[0052]It can be seen from the figure that the lower end of the sample 2a without a partition ring cools faster, and its advanced expansion point appears at 5.5 seconds, while the upper end cools slowly, and its advanced expansion point appears later; and, t...

experiment example 3

[0057] Experimental example three, comparison of quenching oil

[0058] The two samples used in this experiment are taken from the same 42CrMo bar, and the basic dimensions of the samples are both Ф20×135mm. Among them, one is a sample 3a without a separator ring, and the other is a sample 3b with a separator ring, and the shape, size and spacing of the separator rings are the same as those in Experimental Example 1. After being heated to 850°C under the same conditions, sample 3b with a separator ring was cooled vertically in 60SN base oil, while sample 3a without a separator ring was cooled vertically in rapid quenching oil. In this experimental example, 60SN base oil is used to replace the original rapid quenching oil to quench the sample 3b with a partition ring, and compared with the sample 3a without a partition ring quenched with rapid quenching oil. Table 1 is the comparison of the cooling characteristics of the 60SN base oil and the rapid quenching oil used (the oil ...

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Abstract

The invention discloses an immersion oil quench cooling method adopting a plurality of sections for bubble emission. The method is adopted for perpendicular immersion oil quench cooling process of a workpiece. The workpiece is an axis workpiece or a workpiece with axis-shaped sections. The method comprises the following steps: reserving a plurality of axially distributed separation ring except the required size of the workpiece during the cutting process before the quench cooling process, so as to divide the workpiece into the sections axially; then, heating the axis workpiece with the separation rings or the axis-shaped sections, and carrying out cooling to fulfill quench cooling. The method provided by the invention has the advantages that the quench hardness, the hardness uniformity and the workpiece inner quality can be improved; the alloy element resource can be saved; the production cost can be reduced; the production efficiency can be improved.

Description

technical field [0001] The invention relates to the technical field of oil immersion cooling of workpieces in metal heat treatment, in particular to an oil immersion quenching cooling method for discharging air bubbles in multiple stages. Background technique [0002] At present, in the production process, in order to reduce the bending deformation of the workpiece during the heating and quenching and cooling process, most long-axis workpieces are heated and quenched and cooled by vertical suspension. The quenching mentioned here includes not only the quenching for the purpose of obtaining a certain depth of martensitic structure, but also the cooling process for obtaining a fine pearlite structure by immersing large-diameter workpieces in oil. At present, it is generally believed in the industry that parts with the same effective thickness on the same workpiece can usually obtain the same quenching cooling effect during the quenching and cooling process; the effective thick...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D9/28
Inventor 张克俭王水郝学志葛圣东
Owner BEIJING HUALI FINE CHEM CO LTD
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