Tool design for inner race cold forging with skew-type cross ball grooves

Ku, Tae-Wan; Kang, Beom-Soo

doi:10.1016/j.jmatprotec.2014.02.021

Cited by 24 publications

(12 citation statements)

References 9 publications

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“…By doing so, the excessive plastic deformation and critical defects can be prevented in advance. On the other hand, the mechanical strength of the raw material, as well as the elongation, can be improved through a series of heat treatments including spheroidizing and annealing [13,18].…”

Section: Process Design For Two-stage Cold Forgingmentioning

confidence: 99%

“…The two-stage cold forging process in this study was defined as a quasi-static process, so any influence of the strain rate was disregarded. As for the other consideration, the friction coefficient between the tool components and the workpieces was assumed to be 0.098 as the shear friction behavior, during the two-stage cold forging operations were performed, because the surface of the spheroidized and annealed billet material was treated to reduce the friction effect by a phosphophyllite coating (Zn2Fe(PO4)2) [8,12,13]. Figure 5a shows the forging punch and the dies to simulate the forward extrusion process, and Figure 5b displays the backward extrusion punch and the forward extrusion-gearing die to realize the drive shaft by the forward-backward forging.…”

Section: Three-dimensional Finite Element Modelsmentioning

confidence: 99%

“…Because this combined forging process is classified as merging similar or different sequences adjoining each other into one simplified procedure, it is essential that the mechanical properties of the billet workpiece have enough workability and forgeability. These mechanical properties and material characteristics can be provided and improved through suitable material selection and a series of heat treatments such as spheroidizing and annealing, and so forth [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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A Study on Two-Stage Cold Forging for a Drive Shaft with Internal Spline and Spur Gear Geometries

2018

Metals

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A two-stage cold forging process was proposed to manufacture a drive shaft with an internal spline and spur gear geometries, and this process was mainly composed of a forward extrusion for preform and a forward-backward extrusion for the drive shaft. In the process design, the preform was designed using a volume apportioning scheme from the required target shape, thereafter, the initial round billet was outlined. AISI 1035 carbon steel was selected as the raw material, and a spheroidizing heat treatment was adopted. Using the raw and spheroidizing annealed workpieces, uni-axial tensile and compression tests were carried out to evaluate the effect of the heat treatment and to measure the mechanical properties. Finite element simulations were sequentially performed to assure the suitability of the proposed process design. Considering the results from the process design and the numerical simulations, the related tool components were prepared and applied to a series of experimental investigations. The preform and the drive shaft fabricated by the two-stage cold forging experiments were compared with the required target and the numerically predicted configurations. The results indicated that the two-stage cold forging process proposed in this study could be well applied to the production of the drive shaft with an internal spline and spur gear structures.

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Section: Process Design For Two-stage Cold Forgingmentioning

confidence: 99%

Section: Three-dimensional Finite Element Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Study on Two-Stage Cold Forging for a Drive Shaft with Internal Spline and Spur Gear Geometries

2018

Metals

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“…Cold forging is a metal forming process which enables high speed mass production with great mechanical properties. Leading automobile companies starts to prefer complex forged parts for their superior mechanical properties over cast and machined parts [1]. This forces forging companies to decrease production costs.…”

Section: Introductionmentioning

confidence: 99%

Soğuk Cıvata Dövme İşleminde Kalıp Ömrünün Arttırılması: Dövme Kademe Tasarımının Etkisi

Kılıçaslan¹,

İnce²

2017

SAÜ Fen Bilimleri Enstitüsü Dergisi

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Bu çalışmada özel M10x32 dog-point cıvataların soğuk dövme işleminde meydana gelen kalıp hasarı Simufact.forming sonlu elemanlar simülasyon programı kullanılarak incelenmiş ve dövme kademe tasarımlarında değişimler yapılarak kalıplar üzerinde meydana gelen yüksek gerilme değerlerinin azaltılması amaçlanmıştır. Çalışmanın ilk kısmında cıvataya ait beş farklı dövme kademesinde meydana gelen malzeme akışı modellenerek belirlenmiş, kalıp kırılmasının yaşandığı dövme kademesinde oluşan kontak basınçları ile kalıp gerilmeleri tespit edilmiştir. Simülasyonlar cıvata kafa ve flanş kısmının dogpoint'in oluşturulduğu dövme kademesinde aynı anda şekillendirilmesi nedeniyle sabit kalıp üzerinde yüksek çekme gerilmesinin oluştuğunu ve kalıbın bu nedenle hasara uğradığını tespit etmiştir. Bu durumu engellemek amacıyla dog-point kısmı bir sonraki dövme kademesine alınmış ve hazırlık açısı 40°'ye düşürülmüştür. Buna ek olarak tek parça olan dövme kalıbı tasarımı iki parçalı tasarım ile değiştirilmiştir. Bu tasarımlar ile gerçekleştirilen simülasyonlar dövme kalıbındaki gerilmenin yaklaşık %70 oranında azaldığını göstermiştir. Son olarak yenilenen kalıplar ile yapılan üretim denemelerinde kalıp ömrünün 3.8 kat arttığı görülmüştür.

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“…Functionality of the joints in steering is critical and hence the complex geometry. Constant velocity joints 1 also called CV joints are used in steering mechanisms of automotives. They are used in front wheel drive and many modern rear wheel drive cars.…”

Section: Introductionmentioning

confidence: 99%

Design and development of a gauging system for constant velocity ball cage component of constant velocity joint assembly

Swaminathan

Narayana

2015

Proceedings of the Institution of Mechanical Engineers, Part B:

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Gauges used for dimension inspection of critical components in various assemblies need to be precise and accurate. At the same time, the rate of inspection should be as high as possible for increased production. This is more so with regard to steering assemblies of automobiles. In automotive lines, the dimension inspection of the steering assemblies (constant velocity assembly) by Coordinate Measuring Machine would not be feasible as the process is slow and productivity would be affected. The proposed constant velocity gauging system can be considered as an alternative. The constant velocity assembly has six opening windows whose height is extremely critical. The accuracy of the component and the criticality demand complete inspection of the window height and identification of oversized window parts. The proposed cost-effective gauging system has a separate replaceable probe for each window to check the window height. All six windows are checked simultaneously to save production time. The qualified components and rejected components have been checked by first principles and on Coordinate Measuring Machine. Both have been found to be in good agreement.

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Tool design for inner race cold forging with skew-type cross ball grooves

Cited by 24 publications

References 9 publications

A Study on Two-Stage Cold Forging for a Drive Shaft with Internal Spline and Spur Gear Geometries

A Study on Two-Stage Cold Forging for a Drive Shaft with Internal Spline and Spur Gear Geometries

Soğuk Cıvata Dövme İşleminde Kalıp Ömrünün Arttırılması: Dövme Kademe Tasarımının Etkisi

Design and development of a gauging system for constant velocity ball cage component of constant velocity joint assembly

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