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Vibration-solidified low-stress lathe bed casting and casting method thereof

A low-stress, casting technology, applied in casting molding equipment, molds, mold components, etc., can solve the problems of low stress, high dimensional accuracy, uneven composition and structure, and large residual stress, so as to reduce residual stress and promote The effect of solidification nucleation and improvement of carbide morphology

Active Publication Date: 2016-09-21
SICHUAN JIANYANG HAITE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a vibration solidification production method of low-stress and high-precision large-scale bed castings, which solves the problems that the existing large-scale bed castings are prone to uneven composition and structure, coarse grains, and excessive residual stress. Casting structure to obtain castings with low stress and high dimensional accuracy

Method used

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  • Vibration-solidified low-stress lathe bed casting and casting method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) The composition is standard gray cast iron HT300: C 2.9~3.2Mn 0.9~1.1Si 1.2~1.5P≤0.15S≤0.12;

[0033] (2) Put scrap steel, ferrosilicon, ferromanganese, low-carbon ferrochromium, copper and other raw materials in a 2.5t intermediate frequency induction furnace for melting, use ferrosilicon and ferromanganese for deoxidation, and use silicon-calcium diffusion deoxidation for refining. The melting temperature is 1400 ~1500°C, the temperature of molten iron is not lower than 1430°C, and the pouring temperature is 1350°C.

[0034] (3) Sand mold making, the sand mold is made of quartz sand, water glass is used as a binder, carbon dioxide is solidified, the sand mold is compacted and compacted, the surface of the mold is painted with zircon powder paint, the box is closed, and the box is locked.

[0035] (4) After the molten iron fills the casting cavity, a vibrating rod is probed into the riser, and the first-order frequency, second-order frequency, third-order frequency...

Embodiment 2

[0042]Carry out vibration solidification with the steps of Example 1, and the rest of the process parameters and process are the same as Example 1, the difference is that the chemical composition of the selected casting material is different, the chemical composition of the casting in this example is HT250: C 3.16~3.30Mn 0.89~1.04Si1 .79~1.93P 0.120~0.170S 0.094~0.125. The residual stress of the low-stress HT250 prepared by the method of the present invention is detected according to the blind hole method in the residual stress detection method stipulated in Article 5.3 of the Machinery Industry Standard JB / T5926-2005 of the People's Republic of China. The average value of random residual stress at 8 points is 198 MPa. The average value of random residual stress at 8 points is 127 MPa, the residual stress reduction rate is 35.86%, and the stress homogenization degree is 32.45%.

Embodiment 3

[0044] Carry out vibration solidification with the step of embodiment 1, all the other process parameters and processes are the same as embodiment 1, the difference is that the chemical composition of the selected casting material is different, the chemical composition of the casting in this example is HT350: C: 2.8~3.4Si: 1.8~ 2.3Mn 1.0~1.3S0.045p:0.045. The residual stress of the low-stress HT250 prepared by the method of the present invention is detected according to the blind hole method in the residual stress detection method stipulated in Article 5.3 of the Machinery Industry Standard JB / T5926-2005 of the People's Republic of China. The average value of random residual stress at 8 points is 158 MPa. The average value of random residual stress at 8 points is 231 MPa, the residual stress reduction rate is 31.60%, and the stress homogenization degree is 27.13%.

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Abstract

The invention relates to a production method of a lathe bed casting and application, in particular to a vibration-solidified low-stress lathe bed casting and a casting method thereof. The casting method comprises the steps that a sand mould of the lathe bed casting is firstly manufactured; liquid metal is smelted and poured; and three-dimensional vibration solidification is performed. For three-dimensional vibration solidification, through a wavelet spectral analysis technology, after a casting mould cavity is filled with molten iron, a 10-200 Hz low-frequency three-dimensional resonance field is applied; when the molten iron is cooled to a temperature in the range of a Fe-C eutectic point+ / -50 DEG C, 200-2000 Hz high-frequency three-dimensional resonance is performed; the casting sand mould is subjected to still standing; a riser and a runner are cut off; and a flash is ground and removed. The low-frequency three-dimensional resonance field enables the mould cavity to be fully filled with the liquid metal, so that pores, impurity mingling, segregation, cavity shrinkage and other casting defects which often happen during a traditional casting process are overcome; by utilizing the high-frequency three-dimensional resonance, the supercooling degree of the molten iron is improved; solidification nucleation is facilitated; the number of nucleation is increased; and the structure refinement of crystals is facilitated. The casting method is simple in process, low in cost, simple for operation and wide in application range and is pollution-free; the quality of the casting can be obviously improved; and the residual stress of the casting is lowered.

Description

technical field [0001] The invention relates to a production method and application of a bed casting, in particular to a vibration-solidified low-stress bed casting and a casting method thereof. Background technique [0002] High-end large-scale CNC machine tools are the key equipment of modern equipment manufacturing industry and the core equipment of intelligent manufacturing industry. The bed is the most important basic component of the machine tool. It is the benchmark for measuring the geometric accuracy of the machine tool. It is used as the base of the whole machine, and other components are carried on it to work. The bed castings of high-end large-scale CNC machine tools account for about 70-80% of the total weight of the machine tool, and the weight is generally between several tons to dozens of tons. , accuracy and accuracy retention play a vital role. The production risk of bed castings is very high. If one piece is scrapped, the direct economic loss may reach h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/08B22C9/02B22C9/22
CPCB22C9/02B22C9/22B22D27/08
Inventor 范洪远周长春吴亚楠王均孙兰殷国富
Owner SICHUAN JIANYANG HAITE
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