In situ chip formation analyses in micro single-lip and twist deep hole drilling

Kirschner, M.; Michel, Sebastian; Berger, Sebastian; Biermann, Dirk; Debus, J.; Braukmann, D.; Bayer, М.

doi:10.1007/s00170-017-1339-1

Cited by 10 publications

(5 citation statements)

References 10 publications

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“…With the aggravation of wear and the deterioration of the lubrication conditions of the chip and the rake face, the roughness of the chip's extruded surface is increased, and grooves appear. The friction between the chip and the rake face increases, the resistance of the chip flow increases, and the chip thickness increases [31,32]. In addition, after the bluntness of the teeth and the abrading of tool coating, the cutting force, and the heat generated in the cutting zone increase.…”

Section: Chimentioning

confidence: 99%

Investigation of Chip Deformation and Breaking with a Staggered Teeth BTA Tool in Deep Hole Drilling

Zheng

et al. 2019

Metals

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The problem of chip breaking and evacuation is the key point of staggered teeth boring and trepanning association (BTA) drilling. The factors that influence chip breaking with staggered teeth BTA deep hole drilling are analyzed by using the chip bending deformation mechanism for chip formation and flow through the rake face and chip breaker. This study investigated the distribution and variation of chip deformation and breaking along drilling conditions, with respect to drilling radius, drilling process parameters, tool wear, and chip breaker geometric parameters. The results show that the tool-chip contact length is about 1.65 times the chip thickness in staggered teeth BTA drilling. The cutting radius of the teeth has a considerable influence on the chip thickness. Compared with the drilling speed, the feed has a greater impact on chip deformation and breaking, and the chip thickness and strain increase with increased feed. Increased drilling depth and tooth wear aggravates the friction state between the chip and the rake face, augments chip thickness and tool-chip contact length, and increases the chip’s strain increment. As the width of chip breaker decreases and the height increases, the chip strain increases and the breaking conditions are improved.

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Section: Chimentioning

confidence: 99%

Investigation of Chip Deformation and Breaking with a Staggered Teeth BTA Tool in Deep Hole Drilling

Zheng

et al. 2019

Metals

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“…However, this super high strength steel has extremely poor cutting performance and belongs to the typical aviation difficult processing material. In the current cutting process, there are the following main problems [5][6][7]: ① is the complex inner cavity of the landing gear front / main piston rod and the outer cylinder parts of the modern advanced aircraft and the large aircraft, the step hole, the ring slot, the keyway, the conical hole, the threaded hole, Many special structures such as bottom cavity coexist, which makes machining more difficult, especially in deep hole machining, the cutter rod is more deep, the rigidity of tool rod is insufficient and the inherent defect of tool durability is low, it is very difficult to meet the machining requirements of parts.② in the front / main lifting cylinder and piston rod of the landing gear, most of the parts are deep holes whose aspect ratio is greater than 10, the main difficulties in machining these parts are the large cutting force, the easy wear of the tool, the low durability, the long chip-discharge channel and the difficult chip removal [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Research on Deep Hole Machining Based on Aircraft Landing Gear

Cao

Yang

Huang

et al. 2023

J. Phys.: Conf. Ser.

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A landing gear is the main large bearing structural part of an aircraft. The change of material and structure makes the processing of the aircraft landing gear more difficult. Aiming at the structural characteristics of the aircraft landing gear deep cavity, the deep hole processing technique of a 300M steel workpiece was studied. A separated NC deep hole drilling and boring machine was adopted to process the workpiece. Cavity hole special cutting tools were introduced. Fixture and sealing mode were improved. NC programs were optimized. Thus, the processing problems of deflection, vibration, chip breaking and chip removal were solved. The workpiece with width to diameter ratio greater than 10 and surface roughness of hole is 3.2 μm was successfully machined by machining experiment, and the high efficiency machining of deep hole of ultra-high strength steel was realized. Thus the theoretical foundation is laid for the machining of complex cavity deep holes for cutting high-strength alloy materials.

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“…Nickel-based alloy materials have a range of advantages, such as high strength, high temperature resistance, and corrosion resistance, enabling engines to withstand extremely high temperatures and mechanical stresses, and are widely used in the aerospace industry [1][2][3]. However, the high elongation and low thermal conductivity of nickel-based alloy led to significant plastic deformation resistance and high cutting temperature during the machining, which is prone to tool sticking, resulting in tool wear and work hardening, affecting chip flow direction and fracture [4][5][6][7]. Therefore, automatic chip breakage during the machining of nickel-based alloy is a critical factor that restricts high-quality and efficient processing.…”

Section: Introductionmentioning

confidence: 99%

Development of a low-frequency vibration-assisted turning device for nickel-based alloy

Shi,

Zheng,

Zhu

et al. 2023

Preprint

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As a typical difficult-to-machine material which is widely used in aerospace and aviation field, the high quality and efficient machining of nickel-based alloys has always been the hotspot in mechanical machining. However, the problem of force and heat concentrations can reduce the machining stability of nickel-based alloys, leading to tool wear and work hardening, seriously affecting the flow direction and fracture of chips. Therefore, a novel low-frequency vibration-assisted turning device is developed by using adjustable dual eccentric mechanism in this paper. The chip separation conditions of low-frequency vibration turning is analyzed. The relationship between cutting parameters and cutting force, cutting temperature, tool wear, workpiece surface morphology, and tool life was studied through experiments. The experimental results demonstrate that the low-frequency vibration-assisted turning device can effectively suppress cutting force fluctuations, reduce cutting temperature, delay tool wear speed, improve surface quality, and increase tool life, meeting the high-quality and efficient machining requirements of nickel-based alloys. The research results will provide theoretical support for the problem of chip breakage in difficult to machine materials and the study of low-frequency vibration-assisted cutting technology.

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In situ chip formation analyses in micro single-lip and twist deep hole drilling

Cited by 10 publications

References 10 publications

Investigation of Chip Deformation and Breaking with a Staggered Teeth BTA Tool in Deep Hole Drilling

Investigation of Chip Deformation and Breaking with a Staggered Teeth BTA Tool in Deep Hole Drilling

Research on Deep Hole Machining Based on Aircraft Landing Gear

Development of a low-frequency vibration-assisted turning device for nickel-based alloy

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