Device and method for testing influence of sub-dry type cooling condition on surface quality of material

A technology of cooling conditions and surface quality, applied in the direction of measuring devices, analytical materials, thermal analysis of materials, etc., can solve the problems of uneven quality of parts, increase production costs, increase production costs, etc., to achieve easy operation and improve enterprise economic benefits , the effect of improving product quality and production efficiency

Active Publication Date: 2014-12-03
JIANGSU UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of this process method are: 1. Due to the different degrees of difficulty in processing the materials to be cut, in order to meet the cooling needs during cutting, the operator only adjusts the valve switch based on experience to control the flow of the coolant, thereby controlling the flow of the cutting fluid. 2. Repeated entrainment of chip powder in cutting fluid is not conducive to precision machining; 3. It causes certain pollution to the environment, and environmental protection work increases production costs
[0005] However, when using the sub-dry method for cooling cutting, there are the following problems: how to set the cooling conditions and related parameters for different materials, so as to achieve the best cooling effect and the best surface quality of the material? How to ensure the dimensional accuracy and dimensional stability of the processed parts? In the existing technology, the cooling conditions and related parameters are adjusted on the spot by relying on human subjective judgment and limited personal experience after the part processing starts, so the quality of the processed parts is uneven
Sometimes in the process of processing, a large number of workpieces will be scrapped due to continuous adjustment and trying of the best parameters, which not only wastes raw materials, but also greatly increases the production cost of the enterprise

Method used

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  • Device and method for testing influence of sub-dry type cooling condition on surface quality of material
  • Device and method for testing influence of sub-dry type cooling condition on surface quality of material
  • Device and method for testing influence of sub-dry type cooling condition on surface quality of material

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Experimental program
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Effect test

Embodiment 1

[0035]The experimental sample material in the present embodiment, that is, the test piece 18 is 45 steel, and the sub-dry cooling condition is tested to affect the surface quality of the material, that is, the sub-dry cooling condition affects the process steps of the metallographic structure of the material surface as follows:

[0036] a. Install the test piece 18 on the resistance furnace 19; set the temperature of the resistance furnace so that the surface temperature of the test piece 18 reaches the initial set temperature.

[0037] b. Turn on the air compressor 1 and adjust the temperature regulator 5 so that the ejected gas temperature is -10°C and the gas pressure is 0.15Mpa; select the first switch 14 (or second switch 15) of the liquid medium pipeline, and adjust differently The liquid medium (mainly used here as coolant) is measured up to 0.020ml / S, and the position of the first nozzle 17 is adjusted so that it is perpendicular to the test piece 18; if the second swit...

Embodiment 2

[0046] The experimental sample material of the present embodiment, i.e., the test piece 18, is a titanium alloy. The impact of the sub-dry cooling condition on the surface quality of the material, that is, the process steps of the sub-dry cooling condition on the microhardness of the material surface are as follows:

[0047] Process step a, b, c, d, e are similar to embodiment 1, and its difference mainly contains:

[0048] e. The grinding surface of the test piece after fine grinding needs to be mechanically polished; then etched in hydrogen fluoride and nitric acid solution; under a certain pressure, measure the microhardness of the surface of the test piece 18 with a microhardness tester, and pass Measure the diagonal length of the indentation left after the diamond cone indenter is pressed into the surface of the measured object, and calculate the surface microhardness value.

[0049] f. Change sub-dry cooling parameters, repeat the experiment, record the size of the surfa...

Embodiment 3

[0054] Experimental sample material of the present invention is test piece 18 is nickel-base superalloy and 45 steels, and test sub-dry type cooling condition influences on material surface quality and carries out two kinds of material comparisons, namely sub-dry type cooling condition influences material surface residual stress The process steps are as follows:

[0055] Process step a, b, c, d, e are similar to embodiment 1, and its difference mainly contains:

[0056] e. Carry out mechanical polishing to the grinding surface of the test piece after fine grinding; then etch in aqueous regia solution; measure the residual stress of test piece 18 under the stress analyzer Xstress3000; measure the residual stress of different depths from the surface of test piece 18 respectively Stress value, and analyze the size of the residual stress.

[0057] f. Change the sub-dry cooling parameters, repeat the experiment, record the magnitude of the surface residual stress of the test piece...

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Abstract

The invention discloses a device and a method for testing the influence of a sub-dry type cooling condition on the surface quality of a material. The device comprises a test piece, a resistance furnace for fixing the test piece and simulating cutting heat, a gas cooling device and a liquid medium cooling device, wherein the gas cooling device comprises an air compressor, an air filter, a temperature adjuster, a gas flowmeter, a gas pressure meter, a temperature meter and an air drying pipe in sequence; the tail end of the air drying pipe is connected with a first nozzle; the liquid medium cooling device comprises a liquid medium, a liquid flowmeter and a liquid medium pipeline in sequence; the tail end of the liquid medium pipeline is connected with a first nozzle and a second nozzle respectively after being branched. According to the invention, a workpiece does not need to be actually processed; the resistance furnace is used for simulating cutting heat, and experiment operation is simple and easy; before the beginning of processing, optimal cooling conditions and parameters of the material can be tested, and after the conditions and the parameters are fixed, actual processing is carried out, so that the production cost is lowered, and the economic benefit of an enterprise is improved.

Description

technical field [0001] The invention relates to an experimental device and a method thereof in the technical field of mechanical manufacturing metal cutting technology, in particular to a device and a method for testing the influence of sub-dry cooling conditions on the surface quality of materials. Background technique [0002] When cutting metal materials, a large amount of cutting heat will be generated, which will increase the cutting temperature in the cutting area, increase the cutting force, intensify the tool wear, make the whole cutting process difficult, and finally affect the surface quality, dimensional accuracy and Productivity of parts processing, etc. Therefore, in the cutting process, it is often necessary to increase the coolant to cool the cutting and improve the cutting environment to improve the surface quality of the parts. [0003] The current cutting cooling process is mainly to use cutting fluid to cool cutting. A cooling pump, a cooling liquid box, ...

Claims

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Application Information

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IPC IPC(8): G01N25/00G01N25/72
Inventor 任家隆任近静赵礼刚韩剑敏张春燕管小燕樊玉杰胡小康王明建
Owner JIANGSU UNIV OF SCI & TECH
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