Metallic cryogenic tempering method for improving milling stability

A processing method and a stable technology, applied in metal processing, metal processing equipment, metal processing machinery parts, etc., can solve problems such as workpiece scrapping, tool damage, and chatter

Active Publication Date: 2015-04-08
HUAZHONG UNIV OF SCI & TECH
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  • Description
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Problems solved by technology

Tests have shown that if the critical depth of cut is exceeded during the milling process, the process system will be unstable and chatter, resulting in excessive vibration displacement between t

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  • Metallic cryogenic tempering method for improving milling stability
  • Metallic cryogenic tempering method for improving milling stability
  • Metallic cryogenic tempering method for improving milling stability

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Embodiment Construction

[0037] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0038] figure 1 It is a structural schematic diagram of a liquid nitrogen cryogenic cooling system and a hammer test system according to a preferred embodiment of the present invention. Such as figure 1 As shown in , the following will take the VMC-50 machining center (the CNC system is the Huazhong 210B system) to process the 7075-T6 aluminum alloy as an example to clarify the process and eff...

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Abstract

The invention discloses a metallic cryogenic tempering method for improving milling stability. The method includes: (a), assembling a liquid nitrogen cooling nozzle, synchronously moving with a milling machine spindle and an end mill, to the milling machine spindle and the arranged end mill; (b), executing climb milling under the condition of cryogenic cooling, and performing experiment calculation to obtain cutting force coefficients of tangential milling force coefficients, tangential cutting edge force coefficients, radial milling force coefficients, radial cutting edge force coefficients and the like; (c), executing hammer test on a point of a milling cutter, acquiring a corresponding displacement frequency response function based on test result fitting, and extracting modal parameters such as modal mass, modal damping and modal stiffness; (d), constructing a two-degree-of-freedom milling dynamics equation, then predicating stability boundaries in the metal milling process based on the dynamics equation, and correspondingly adjusting the milling parameters. By the method, the problems of cutting heat and cutting process system unstability can be solved comprehensively, and the maximum chatter-free material removal rate of cryogenic tempering is significantly increased.

Description

technical field [0001] The invention belongs to the technical field of milling processing technology, and more specifically relates to a metal cryogenic processing method for improving milling stability. Background technique [0002] In various metal milling processes, coolant has been widely used. Spraying coolant to the cutting area can effectively reduce the friction coefficient between the tool and the workpiece material, and take away most of the incoming tool, workpiece and chips. The cutting heat can reduce the cutting temperature and improve the surface processing quality. However, for difficult-to-cut materials such as titanium alloys and superalloys that are widely used in the aerospace industry, a large amount of coolant is required and conservative process parameters are selected to ensure sufficient tool life and reliable surface quality, so the material removal rate and because the cooling liquid itself is harmful to the operators and the environment, its recy...

Claims

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Application Information

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IPC IPC(8): B23Q11/10B23Q17/09G06F19/00
CPCB23C3/00B23C2250/12B23Q11/1084B23Q17/0952B23Q2717/006
Inventor 丁汉黄信达张小明牟海阔张小俭
Owner HUAZHONG UNIV OF SCI & TECH
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