Evaluation of anti-galling ability of zinc phosphate coating by backward extrusion of cylindrical cup

Kada, Osamu; Wang, Zhigang; Miyanishi, Kei; Yanagi, Hidekazu; Nose, Yukari

doi:10.1016/j.jmatprotec.2020.116765

Cited by 8 publications

(2 citation statements)

References 20 publications

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“…The zinc phosphate coating with metal soap is a solid coating formed on the billet by chemical reaction and is proportionally thinned by cleavage deformation, following the surface area expansion of the billet being extruded. According to the report of Kada et al [8], the surface area expansion ratio with the cup depth of 43 mm is 50, and the zinc phosphate coating thickness near the cup bottom is about 0.1 μm.…”

Section: Experimental Methodsmentioning

confidence: 97%

Heat Transfer Coefficient of Zinc Phosphate Coating with Metal Soap during Cold Backward Extrusion

Kada

Wang

2022

DDF

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In cold forging, the temperature difference between the workpiece and the tool is small and thus deformation analysis is rarely coupled with thermal analysis. However, the friction coefficient of zinc phosphate coating with metal soap has a large temperature dependence. Consideration of the effects of workpiece and tool temperature change on the friction coefficient is thus expected to improve the analytical accuracy of cold forging. Thermally coupled cold forging analysis requires thermal conductivity, specific heat, heat transfer coefficient between the workpiece and the tool, in addition to the temperature dependence of flow stress and friction coefficient. The heat transfer coefficient between workpieces coated with zinc phosphate with metal soap and tools is investigated in this paper. Cold backward extrusion was performed with a 50% reduction of area, and the temperature history in the punch was measured with a thermocouple. The forging speed was 1, 3, and 10 spm. FEM analysis was performed to simulate the experiment by considering the temperature dependence of flow stress and friction coefficient. The heat transfer coefficient was estimated at 20 kW/(m2•°C) by comparing the experimental result and calibration curves.

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Section: Experimental Methodsmentioning

confidence: 97%

Heat Transfer Coefficient of Zinc Phosphate Coating with Metal Soap during Cold Backward Extrusion

Kada

Wang

2022

DDF

Self Cite

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“…Kada et al [ 170 ] devised a method to predict antigalling ability of coatings used for lubrication in forging process. According to the observations, it was found that increase in extrusion load with increase in stroke indicated galling effect of the lubricant due to continuous increase in friction coefficient.…”

Section: Monitoring Of Forging Processmentioning

confidence: 99%

A Systematic Review of Factors Affecting the Process Parameters and Various Measurement Techniques in Forging Processes

Sharma

Gupta

et al. 2023

steel research int.

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Forging is a primary manufacturing process used in several manufacturing industries. Aircraft and automobile industries are manufacturing products with high‐dimensional accuracy and quality that are highly precise or near the required shape. Customers require products that are free of cracks and fulfill their functional requirements. This leads to the advancement of the forging process due to its ability to form complicated and intricate shapes. Herein, a detailed review of the aspects of forging is given in which the optimization of factors like preform design, forging conditions, workpiece dimensions, die design, lubricant properties, and thermal treatment parameters are discussed, enhancing the tool life and forging quality of the product. The selection of die‐forging tool material and methods for enhancing the surface quality of forged products are also reviewed. The article also presents methods for measurement of forging quality, tool life, machine effectiveness, forging image acquisition, and forging parameters, which can significantly reduce the risk of error at every step of the forging process. This review serves as a reference for researchers to increase production rate, enhance the effectiveness of measurement system, and improve the quality of forged products with technological advancement.

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Grain size effect on the assembly quality of micro-scaled barrel formed by microforming

Hu,

Fang,

Zeng

et al. 2023

Adv. Manuf.

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Evaluation of anti-galling ability of zinc phosphate coating by backward extrusion of cylindrical cup

Cited by 8 publications

References 20 publications

Heat Transfer Coefficient of Zinc Phosphate Coating with Metal Soap during Cold Backward Extrusion

Heat Transfer Coefficient of Zinc Phosphate Coating with Metal Soap during Cold Backward Extrusion

A Systematic Review of Factors Affecting the Process Parameters and Various Measurement Techniques in Forging Processes

Grain size effect on the assembly quality of micro-scaled barrel formed by microforming

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