Automobile engine valve blank cross wedge rolling accurate forming method

A technology of automobile engine and cross wedge rolling, which is applied in the direction of rolling, metal rolling, metal rolling, etc. It can solve the problems of large length-to-diameter ratio, small diameter of valve blank stem, sensitive process parameters, etc., and achieves improved production efficiency, The effect of improving mold life and yield

Inactive Publication Date: 2010-07-28
UNIV OF SCI & TECH BEIJING
View PDF0 Cites 19 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The diameter of the stem part of the valve blank is small and the length-to-diameter ratio is large, which brings certain difficulties to the cross wedge rolling forming; t

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Automobile engine valve blank cross wedge rolling accurate forming method
  • Automobile engine valve blank cross wedge rolling accurate forming method
  • Automobile engine valve blank cross wedge rolling accurate forming method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026] like Image 6 An example of a precisely formed automotive engine valve blank of the present invention is shown. Install a pair of rolls with a mold with a forming angle of α=26°, a widening angle of β=6°, and a transition fillet radius of R=10mm on the cross wedge rolling mill. The mold expansion diagram is as follows image 3 shown. After heating a metal round bar with a diameter of 16mm and a length of 169mm to 1150°C through an electromagnetic induction furnace, it is placed in the pass between the upper and lower molds through an axial feeding device (such as figure 2 shown), under the action of the wedge, it rotates under the action of the wedge, after continuous radial compression and axial extension deformation, the formed rolled piece is cut from the middle to form a length of 175mm, the radius of the step transition fillet is 10mm, and the diameter of the thin rod is 8.5mm, a pair of automotive engine valve blanks with a length of 124.2mm.

example 2

[0028] A pair of rolls with a mold with a forming angle of α=30°, a widening angle of β=5°, and a transition fillet radius of R=5mm is installed on the cross wedge rolling mill. After the metal round bar with a diameter of 15mm and a length of 179mm is heated to 1180°C by an electromagnetic induction furnace, it is placed between the upper and lower molds through an axial feeding device, and it rotates under the action of a wedge to continuously compress radially. 1. After axial extension and deformation, cut the formed rolled piece from the middle to form a pair of automobile engine valve blanks with a length of 183mm, a step transition fillet radius of 5mm, a thin rod diameter of 8.5mm, and a length of 132mm.

example 3

[0030] A pair of rolls with a mold with a forming angle of α=23°, a widening angle of β=8°, and a transition fillet radius of R=15mm is installed on the cross wedge rolling mill. After the metal round bar with a diameter of 16mm and a length of 170mm is heated to 1100°C by an electromagnetic induction furnace, it is placed between the holes of the upper and lower molds through an axial feeding device, and it rotates under the action of a wedge to continuously compress radially. 1. After axial extension and deformation, the formed rolled piece is cut from the middle to form a pair of automobile engine valve blanks with a length of 176mm, a step transition fillet radius of 15mm, a thin rod diameter of 8.5mm, and a length of 125mm.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Lengthaaaaaaaaaa
Diameteraaaaaaaaaa
Lengthaaaaaaaaaa
Login to view more

Abstract

The invention relates to an automobile engine valve blank cross wedge rolling accurate forming method, which comprises the following processes that: a roller with two wedge-shaped molds is arranged on a cross wedge rolling machine; then a round metal rod material is heated to 1100 to 1180 DEG C; finally, the round metal rod material is arranged on a caliber between an upper mold and a lower mold through an axial feed device, the roller with the sedge-shaped molds rotates in the same direction; and the heated round metal rod material carries out the rotary motion under the action of the side wall and the top surface of a mold wedge, continues the deformation of radial compression and axial extension, and is cut in the middle thereof to gain a pair of automobile engine valve blanks; the forming angle Alpha of the wedge-shaped mold is 23-30 degrees, the widening angle Beta thereof is 5-8 degrees, and the knuckle R thereof is 5-15mm; and compared with the traditional electrical upsetting process, the invention has the advantages that the cost is reduced, the production rate is improved, and the remarkable economic benefit is brought.

Description

technical field [0001] The invention belongs to the field of plastic forming of shaft parts, and in particular provides a precise cross-wedge rolling forming method for an automobile engine valve blank, which is suitable for the production of the automobile engine valve blank. technical background [0002] The valve is an important part of the engine. With the development of the domestic automobile industry, the demand for the valve is increasing. Most of the existing valve blanks are produced by electrothermal upsetting, which has the problems of unstable quality and easy over-burning of materials during processing. Cross-wedge rolling technology is an advanced technology for plastic forming of shaft parts. Its working principle is: two rolls with wedge-shaped molds rotate in the same direction, driving the circular bar to rotate in the opposite direction, and the action of the bar on the die pass Next, rolled into various stepped shafts. Its main deformation is radial co...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): B21H1/22B21B27/02
Inventor 刘晋平胡正寰龙思习杨翠苹郑振华黄江华张弢莫东强
Owner UNIV OF SCI & TECH BEIJING
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap