Unlock instant, AI-driven research and patent intelligence for your innovation.

Expanding die effectively avoiding straight flanges

A technology of mold and diameter expanding machine, which is applied in the field of machinery, can solve problems such as the roundness of steel pipes not meeting the requirements, and achieve the effects of high precision, improved roundness precision, and good roundness

Inactive Publication Date: 2014-08-27
山东华津机电科技股份有限公司
View PDF6 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, since the contact surfaces between adjacent expansion dies are flat, when the expansion blocks expand, a longitudinal linear gap is formed between the adjacent expansion blocks. After the diameter of the steel pipe is expanded, the linear gap between adjacent expansion blocks is due Plastic deformation fits to form a straight edge, resulting in that the roundness of the steel pipe after diameter expansion cannot meet the requirements

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
  • Expanding die effectively avoiding straight flanges
  • Expanding die effectively avoiding straight flanges
  • Expanding die effectively avoiding straight flanges

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] see figure 1 , figure 2 , the expansion die 1 of the present embodiment is connected with the guide keyway 21 of the rhombic cone 2 using the guide key 11 to form a cylindrical barrel; by figure 1 , figure 2 It can be seen that the side edge of the expanding die 1 is wavy and interlocks with the adjacent dies. figure 1 Among them, when the expanding die 1 shrinks to the minimum diameter through the cone 2, the wavy edge of the expanding die 1 bites into a full circle; when the expanding die 1 expands to the maximum diameter through the cone 2, the wave of the expanding die 1 The edge of the shape has never been completely separated from the occlusal shape, and it is still a complete circle.

Embodiment 2

[0022] see image 3 , Figure 4 , Figure 5 , The structure of this embodiment is basically the same as that of Embodiment 1, the difference is that the side edge of the expanding die 1 adopts a tooth shape to engage with the adjacent die.

[0023] image 3 , Figure 4 Among them, 1 is an expanding die, 2 is a diamond-shaped cone, 12 is a longitudinal guide key, 13 is a radial guide key, and 3 is an intermediate guide ring. The surface of the diamond-shaped cone 2 is evenly provided with a plurality of longitudinal guide grooves, the bottom surface of each expanding die 1 is equipped with a longitudinal guide key 12, the side of each expanding die 1 is equipped with a radial guide key 13, and the pull rod 4 stretches the diamond The tapered cone 2 forces the expansion die 1 to expand and contact the inner wall of the steel pipe, and the steel pipe is plastically deformed to obtain a complete circle of diameter expansion.

[0024] from Figure 5 It can be seen that the ma...

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

No PUM Login to View More

Abstract

The invention belongs to the field of machines and particularly relates to an expanding die capable of carrying out mechanical expanding precisely and effectively avoiding straight flanges. The expanding die effectively avoiding the straight flanges is applied to a mechanical expanding machine, and is connected with a pyramid-shaped guide key groove through a guide key to form a cylindrical barrel. The expanding die effectively avoiding the straight flanges is characterized in that wave forms or tooth forms are adopted by the side edges of the expanding die to be meshed with adjacent dies. When the expanding die is shrunk to a minimum diameter through the pyramid, the wave-form or tooth-form edges of the expanding die are meshed to form a whole circle, and when the expanding die is expanded to a maximum diameter through the pyramid, the wave-form or tooth-form edges of the expanding die are not broken away from a meshed mode all the time and is still in a whole circle. Steel pipes expanded by the expanding die effectively avoiding the straight flanges is good in circular degree and high in precision, the precision of the circular degree of the steel pipes after expanding is improved by more than 50 percent compared with that of the steel pipes expanded in the prior art, and the most precise circular degree is 0.2 mm.

Description

technical field [0001] The invention belongs to the field of machinery, and in particular relates to a diameter-expanding die with high-precision mechanical diameter-expanding that can effectively avoid straight edges. Background technique [0002] Mechanical diameter expansion is an important process to ensure the quality of steel pipes in the production of welded pipes. Mechanical diameter expansion is a material processing technology that uses the principle of oblique block hole expansion and plastically deforms the tube blank through the split punch. Mechanical diameter expansion belongs to the rigid mold bulging technology in the field of pipe secondary processing. Mechanical diameter expansion can eliminate part of the residual stress caused by forming and welding, improve the internal stress distribution of steel pipes, and at the same time make the steel pipes reach the roundness and Straightness reduces construction difficulty. Diameter expansion has become an impo...

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
Patent Type & Authority Applications(China)
IPC IPC(8): B21D37/10B21D39/08
Inventor 陈佳彭德平蒙家才王占理刘伟曾强吴耀星张鑫罗儒鸿
Owner 山东华津机电科技股份有限公司