MINIMUM WALL THICKNESS OF HOLLOW THREADED PARTS IN THREE-DIE COLD THREAD ROLLING

2008 ◽  
Vol 22 (31n32) ◽  
pp. 6112-6117 ◽  
Author(s):  
HUIPING QI ◽  
YONGTANG LI ◽  
JIANHUA FU ◽  
ZHIQI LIU
Keyword(s):  
Wall Thickness ◽  
High Efficiency ◽  
Low Cost ◽  
Work Piece ◽  
Forming Process ◽  
Minimum Thickness ◽  
Thread Rolling ◽  
Thin Walled ◽  
Rolling Technology ◽  
Good Agreement

The cold thread rolling technology was developed rapidly in recent years due to its high efficiency, low cost and perfect mechanical properties of its production. However, researches on the precise thread rolling of the hollow parts were very few. Traditionally, the minimum thickness of the thin-walled threaded parts by thread rolling was mainly determined by the empirical (trial and error) methods. In this study, the forming process of thin-walled thread parts rolled with three thread rolling dies was analyzed. The stress state of the hollow work piece was obtained by solving the statically indeterminate problems. Then, the equations for the minimum wall thickness were derived. Experiments are also performed. The experimental results are generally in good agreement with those by the current theoretical analysis. It could be concluded that the analysis presented in this study can provide a good guidance for the thread rolling of hollow parts.

Influences of Heat Treatment on Spinning Process with Large Thinning Rate and Performance of 30CrMnSiA

2012 ◽  
Vol 160 ◽  
pp. 97-102 ◽  
Author(s):  
Dong Han ◽  
He Yang ◽  
Mei Zhan ◽  
Ming Yang Yang ◽  
Shao Zheng Mou ◽  
...  
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
Annealing Process ◽  
Shape Accuracy ◽  
Spinning Process ◽  
Forming Efficiency ◽  
Thin Walled ◽  
And Performance ◽  
Lower Ratio ◽  
Thinning Rate

In order to improve the limits of wall thickness reduction of 30CrMnSiA steel in process of spinning, realize multi-pass continuous spinning process, and furthermore improve the forming efficiency and shape accuracy of thin-walled shell of 30CrMnSiA steel in spinning process, the influence of traditional annealing and austenization plus spheroidal annealing on the structure performance of 30CrMnSiA steel and the spun performance of 30CrMnSiA steel are studied. Process parameters of traditional anneal and austenize plus spheroidal annealing are optimized to obtain higher plastic performance and lower ratio of yield strength to tensile strength. Spinning experiments of the workpieces that have been heattreated by the optimized traditional annealing process and austenization plus spheroidal process are completed. The result shows that the optimized austenization plus spheroidal annealing is beneficial to achieve a large thinning rate for flow spinning process, and can meet the demands of low cost and high efficiency of batch production.

A Novel Desktop Device for Lapping Milled Micro Thin-Walled Structures

2011 ◽  
Vol 325 ◽  
pp. 508-513 ◽  
Author(s):  
Peng Zhang ◽  
Bo Wang ◽  
Mark J. Jackson ◽  
Xing Mao
Keyword(s):  
Surface Topography ◽  
High Efficiency ◽  
Low Cost ◽  
Three Dimensional ◽  
Structured Surfaces ◽  
Structured Surface ◽  
Thin Walled Structures ◽  
Key Points ◽  
Thin Walled ◽  
Small Parts

Current requirements for producing highly precise and ultra-smooth micro structured surfaces of small parts are proposed in certain situations. The following question arises: how to make a highly precise and ultra-smooth micro-structured surface with high efficiency and low cost? Novel desktop lapping and polishing devices should be developed to satisfy these requirements. In order to improve the surface topography and remove the surface damaged layer of a highly precise and ultra-smooth micro thin-walled structure after milling with the width of 150 μm and the depth of 10 μm, a novel lapping desktop device is designed and developed. There are two key points in the design of the lapping desktop device: one is the vertical coupled macro-micro movement axis; the other is the fixture with a thin and flexible hinge structure, which has the capability of measuring both force and displacement as a double-feedback sensor to control both the micro lapping force and the depth of lapping. The experimental results show that the surface topography of the micro thin-walled structured surface is much improved after lapping, and that the three-dimensional surface roughness decreased from 329 nm to 82.2 nm.

scholarly journals Study on the Forming Process and Deformation Behavior of Inner Ring in the Wheel Hub Bearing Based on Riveting Assembly

Materials ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 3785
Author(s):  
Wei Xiong ◽  
You Wang ◽  
Xiao-Ping Li ◽  
Song Mei ◽  
Zhu-Xin Tian
Keyword(s):  
Deformation Behavior ◽  
High Efficiency ◽  
Low Cost ◽  
Clamping Force ◽  
Forming Process ◽  
Design And Optimization ◽  
Bearing Clearance ◽  
Riveting Process ◽  
Research Findings ◽  
Simulation Results

The orbital riveting process has been successively adopted in the assembly of wheel hub bearing, due to its special merits of high efficiency, low cost, and so on. The forming process and deformation behavior of the inner ring have significant influence on the axial clamping force and bearing clearance, however, which haven’t been addressed yet. In this study, a numerical simulation platform for the assembly of the hub bearing is established by the joint use of the static implicit and dynamic explicit algorithms. Based on the platform, the deformation process and deformation behavior of the inner ring are investigated, along with the interference assembly and riveting assembly on the loading process of the inner ring. Finally, relevant experimental verifications are carried out to consolidate the simulation results. The research findings could be used to guide the design and optimization of the axial clamping force and bearing clearance.

Mesh Dynamics Analysis of Gear Shaving Cutter Research Based on ADAMS Software

2015 ◽  
Vol 757 ◽  
pp. 93-97
Author(s):  
Chang Ming Zhang ◽  
Yan Yuan Shen ◽  
Hui Zhang
Keyword(s):  
Contact Pressure ◽  
High Efficiency ◽  
Simulation Analysis ◽  
Low Cost ◽  
Tooth Profile ◽  
Work Piece ◽  
Analysis Tool ◽  
Profile Curve ◽  
Software Analysis ◽  
Adams Software

Gear shaving machining is the one way of gear finish machining; this machining processing is applied in the gear manufacturing widely because of its high efficiency and low cost. Due to the use of standard involutes gear shaving cutter for shaving, the work piece profile nodes occur with varying degrees of "concave" phenomenon. This profile not only affects the gear transmission accuracy, but also can increase the transmission noise, shorten the service life of the gear. In this paper, by using ADAMS software analysis tool, the shaving cutter gear the non-backlash meshing process contact simulation analysis, reached along the tooth profile curve of the contact pressure distribution results. And in the ADAMS environment Post / Process module, in order to meet the needs of the whole tooth profile curve approach contact pressure as the goal, the shaving cutter gear meshing of the maximum contact pressure was carried out based on the experimental design optimization, which conducted the tooth profile modification.

scholarly journals THREAD ROLLING REPAIR METHOD FOR 3D PRINTED BOLTS

2021 ◽  
Vol 1 ◽  
pp. 3141-3148
Author(s):  
Tim Katzwinkel ◽  
Esanula Mohammad ◽  
Philipp Silberkuhl ◽  
Manuel Löwer
Keyword(s):  
3D Printing ◽  
Low Cost ◽  
New Method ◽  
Cold Forming ◽  
Repair Method ◽  
Explorative Study ◽  
Thread Rolling ◽  
Good Potential ◽  
3D Printed ◽  
Rolling Technology

AbstractWithin this paper, a new method for the quality refinement of external metric standard threads on 3Dprinted bolts is presented. The repair method is based on the application of thread rolling technology, which is applied in terms of cold forming after the regular printing has been finished. The explorative study proves, that the investigated technology has a good potential to solve known precision issues in FDM 3D printing regarding the required accuracy for function fulfilling standardized threads. The application of thread rolling can be done manually and with minimal tool effort, which makes the technology particularly attractive for low cost applications.

Influences of Heat Treatment on Spinning Process with Large Thinning Rate and Performance of 30CrMnSiA

2012 ◽  
Vol 214 ◽  
pp. 395-400
Author(s):  
Dong Han ◽  
He Yang ◽  
Mei Zhan ◽  
Ming Yang Yang ◽  
Shao Zheng Mou ◽  
...  
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
Annealing Process ◽  
Shape Accuracy ◽  
Spinning Process ◽  
Forming Efficiency ◽  
Thin Walled ◽  
And Performance ◽  
Lower Ratio ◽  
Thinning Rate

In order to improve the limits of wall thickness reduction of 30CrMnSiA steel in process of spinning, realize multi-pass continuous spinning process, and furthermore improve the forming efficiency and shape accuracy of thin-walled shell of 30CrMnSiA steel in spinning process, the influence of traditional annealing and austenization plus spheroidal annealing on the structure performance of 30CrMnSiA steel and the spun performance of 30CrMnSiA steel are studied. Process parameters of traditional anneal and austenize plus spheroidal annealing are optimized to obtain higher plastic performance and lower ratio of yield strength to tensile strength. Spinning experiments of the workpieces that have been heattreated by the optimized traditional annealing process and austenization plus spheroidal process are completed. The result shows that the optimized austenization plus spheroidal annealing is beneficial to achieve a large thinning rate for flow spinning process, and can meet the demands of low cost and high efficiency of batch production.

scholarly journals Research on AZ80 + 0.4%Ce (wt %) Ultra-Thin-Walled Tubes of Magnesium Alloys: The Forming Process, Microstructure Evolution and Mechanical Properties

Metals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 563 ◽  
Author(s):  
Zhaoming Yan ◽  
Min Fang ◽  
Zhendong Lian ◽  
Zhimin Zhang ◽  
Jiaxuan Zhu ◽  
...  
Keyword(s):  
Magnesium Alloys ◽  
Wall Thickness ◽  
Vickers Hardness ◽  
Hardness Test ◽  
Optical Microscope ◽  
Forming Process ◽  
Average Grain Size ◽  
Thin Walled Tube ◽  
Thin Walled ◽  
Variable Wall

Ultra-thin-walled tubes of magnesium alloys have received more and more attention in producing precision components for medical devices. Therefore, thin-walled tubes with high quality are desperately needed. In this study, the process of multi-pass variable wall thickness extrusion was carried out on an AZ80 + 0.4%Ce Mg alloy with up to five passes—one-pass backward extrusion and four-pass extension—to fabricate the seamless thin-walled tube with an inside diameter of 6.0 mm and a wall thickness of 0.6 mm. The average grain size decreased from 46.3 μm to 8.9 μm at the appropriate deformation temperature of 350 °C with the punch speed of 0.1 mm/s. X-ray diffraction (XRD), optical microscope (OM), scanning electron microscopy (SEM), and the Vickers hardness (HV) tester were utilized to study the phases, microstructure, and hardness evolution. It can be observed that low deformation temperatures (240 °C and 270 °C) and low strain (1 pass extrusion and 1 pass extension) lead to twins that occupy the grains to coordinate deformation, and a slip system was activated with the accumulation of strain. The results of the Vickers hardness test showed that twinning, precipitation of second phases, twinning dynamic recrystallization (TDRX), and work hardening were combined to change the hardness of tubes at 240 °C and 270 °C. The hardness reached 93 HV after the third pass extension without annealing at 350 °C.

Design and Implementation of Control System in Warm Extrusion Forming Process Manipulator for Steel Connecting Sleeve

2013 ◽  
Vol 404 ◽  
pp. 678-681
Author(s):  
Xin Ju Zhang ◽  
Xiu Hong Ma ◽  
Fu Xiang Zhang ◽  
Hui Qin Cao
Keyword(s):  
Control System ◽  
Simple Structure ◽  
High Efficiency ◽  
Low Cost ◽  
Forming Process ◽  
Backward Extrusion ◽  
Working Principle ◽  
Production Automation ◽  
Extrusion Forming ◽  
Warm Extrusion

There are three work posts in this warm extruder: upsetting station backward extrusion station and blanking station. They work continuously. The manipulator is mainly used to passing artifacts from one station to another. The warm extrusion forming process manipulator for steel connecting sleeve typically was designed to reduce labor intensity and enhance production automation level. The machines structure and working principle were described. In the same time, the machine control system that adopts the PLC programmable controller can simplify the control system, and its reliability strengthens further. Practices show that the strapping machine has the advantages of simple structure, high efficiency, low cost and small vibrating noise.

A single-layer low-cost reflectarray antenna using dual-resonant element approach

Frequenz ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ting Liu ◽  
Lin Zhang ◽  
Jialiang Wu ◽  
Jing Zhao ◽  
Zhiguo Zeng
Keyword(s):  
Phase Shift ◽  
High Efficiency ◽  
Low Cost ◽  
Single Layer ◽  
Center Frequency ◽  
Gain Bandwidth ◽  
Element Approach ◽  
Reflectarray Antenna ◽  
Good Agreement ◽  
Ku Band

Abstract A single-layer wideband high efficiency reflectarray in Ku-band has been presented in this paper. A novel dual-resonant patch element approach has been analyzed and optimized to obtain good radiation performances within the operating frequency band. The phase shift range of 573° can be obtained with less steep linear phase shift curve. To compensate the differential spatial phase delays from the feed to the elements, the variable size technique has been utilized for obtaining required phase shifts. The reflectarray aperture has been designed, manufactured and measured. Measured results are in good agreement with the simulated ones. The measured gain of the reflectarray aperture at center frequency can reach 27.2 dBi, which is equivalent to aperture efficiency of 51.3%, and the 1-dB gain bandwidth of the aperture is 18.4%.

scholarly journals PROCESS SIMULATION AND QUALITY EVALUATION IN INCREMENTAL SHEET FORMING

2011 ◽  
Vol 12 (3) ◽  
Author(s):  
Meftah Hrairi ◽  
Salah B. M. Echrif
Keyword(s):  
Wall Thickness ◽  
Metal Forming ◽  
Tool Path ◽  
Incremental Forming ◽  
Low Cost ◽  
Single Point ◽  
Single Point Incremental Forming ◽  
Forming Process ◽  
Metal Forming Process ◽  
Complex Parts

Single Point Incremental Forming (SPIF) is a promising sheet-metal-forming process that permits the manufacturing of small to medium-sized batches of complex parts at low cost. It allows metal forming to work in the critical ‘necking-to-tearing' zone which results in a strong thinning before failure if the process is well designed. Moreover, the process is complex due to the number of variables involved. Thus, it is not possible to consider that the process has been well assessed; several remaining aspects need to be clarified. The objective of the present paper is to study some of these aspects, namely, the phenomenon of the wall thickness overstretch along depth and the effect of the tool path on the distribution of the wall thickness using finite element simulations.Abstrak: Pembentukan Tokokan Mata Tunggal (Single Point Incremental Forming (SPIF)) merupakan satu proses pembentukan kepingan logam yang membolehkan pembuatan dalam jumlah yang kecil hingga sederhana, bahagian-bahagian yang kompleks pada kos yang rendah. Jika proses ini direka dengan baik, kaedah ini membolehkan pembentukan logam yang baik terhasil. Jika tidak, semasa peringkat zon kritikal ‘perleheran-ke-pengoyakan' menyebabkan penipisan keterlaluan yang boleh menyebabkan logam tersebut rosak. Tambahan pula, proses ini agak kompleks, kerana ia melibatkan beberapa pemboleh ubah. Maka, walaupun proses ini telah dinilaikan seeloknya; masih terdapat beberapa aspek lain yang perlu diperjelaskan. Objektif kertas ini dibentangkan adalah untuk mengkaji beberapa aspek tertentu, seperti, ketebalan dinding regangan berlebihan di sepanjang kedalaman dan kesan tool path (beberapa siri posisi koordinat untuk menentukan pergerakan alatan memotong ketika operasi memesin) terhadap pengagihan ketebalan dinding menggunakan simulasi unsur terhingga.

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