CN102861826A

CN102861826A - Stretch bent mold sticking repairing method

Info

Publication number: CN102861826A
Application number: CN2012103372261A
Authority: CN
Inventors: 马金昌
Original assignee: Changchun Railway Vehicles Co Ltd
Current assignee: CRRC Changchun Railway Vehicles Co Ltd
Priority date: 2012-09-13
Filing date: 2012-09-13
Publication date: 2013-01-09

Abstract

A stretch bent mold sticking repairing method comprises the following steps of firstly clamping a profile to be stretched and bent onto a stretch bending machine to be fixedly clamped so as to be stretched and bent, comparing a stretch bent piece after being stretched and bent with a standard sample plate, and measuring a clearance value between an arc position of the stretched and bent piece and the sample plate; producing and selecting aluminum sheets with different thicknesses according to the clearance value, utilizing industrial glue water to stick the aluminum sheets onto the arc position of a stretching and bending mold, and making the part of the profile, which is contacted with the arc position of the stretching and bending mold, adequately bent in the stretching and bending process so as to realize the sample plate requirement. The aluminum sheets with different thicknesses are stuck to the arc position of the mold, the thickness of each aluminum sheet can be selected at will, convenience and rapidness can be realized, and not only can the production efficiency be improved, but also the repairing cost can be reduced; and the sticking repairing method is adopted, so that a mold steel plate is not heated, and the mold is free from being deformed, the microscopic tissues of the steel plate are not changed, so that not only is the repairing precision improved, but also the normal service life of the mold is guaranteed.

Description

A kind of bending Bonded Repair method

Technical field

The present invention relates to a kind of Bonded Repair method of bending, belong to machine-building, stretch wrap forming technical field.

Background technology

Stretch bending process is being brought into play great function in the vehicle body of railway vehicle manufacturing, bending directly affects the forming quality of stretch bending spare as the Core equipment of stretch wrap forming technology.The Design and manufacture of bending is a very complicated technology, extensively adopt numerical simulation technology to revise in the matrix design stage at present, although the precision of current main-stream numerical simulation software is more and more higher, but the factor that affects stretch bending spare forming quality is very many, and still there is certain error in numerical simulation technology; Make the process segment at mold, extensively adopt Digit Control Machine Tool to process, also there is certain error in digital control processing itself, because bending designs and processes the error accumulation of two aspects, cause in the production stretch bending spare forming accuracy not high, when stretch bending camber beam and column, it is large not that large arc and little arc connecting place tend to occur radian, the slit of radian and model is generally at the 1.5-4 millimeter, and the way that usually adopts mold to repair in the production improves forming accuracy.

Extensively adopt after the first built-up welding method of milling to repair in producing at present, there is very large defective in this method for repairing and mending, at first is that production efficiency is low, cost is high, often needs repeatedly to repair just and can get a desired effect; Next is that the repairing precision is low, and the built-up welding meeting causes very large heat input repeatedly, causes the bending local deformation, and the metallographic structure of mold steel plate is changed, and has reduced the service life of mold.

Summary of the invention

The purpose of this invention is to provide a kind of bending Bonded Repair technology, mainly solve traditional built-up welding milling method and repair that precision is low, efficient is low, cost is high and mold short problem in service life.

For achieving the above object, the invention provides a kind of bending Bonded Repair method, it is characterized in that comprising the following steps:

1, die trial: the section bar that will treat stretch bending is installed on the stretch benders, fixes to clamp, and carries out stretch bending, and the stretch bending spare behind the stretch bending and standard jig are compared, and measures the gap width between stretch bending spare circular arc place and the model;

2, Bonded Repair: the aluminium flake of making, selecting thickness not wait according to the size of gap width, with industrial glue aluminium flake is sticked on the circular arc place of bending, position abundant bending in the stretch bending process that section bar is contacted with the bending circular arc reaches the model requirement.

The built-up welding milling patching that contrast is adopted in producing at present, the present invention sticks on mold circular arc place by the aluminium flake of different-thickness, and aluminium flake thickness can be selected arbitrarily, and is convenient and swift, both improved production efficiency, reduced again the repairing cost; Adopt the Bonded Repair method, mold steel plate not subjected process, mold is without distortion, and the steel plate microscopic structure does not change, and has both improved the repairing precision, has guaranteed again the normal service life of mold.

Description of drawings

Fig. 1 is step 1 die trial schematic diagram of the present invention;

Fig. 2 is that step 2 of the present invention is pasted the aluminium flake schematic diagram;

Fig. 3 is the cutaway view along A-A line among Fig. 2.

The specific embodiment

Describe as an example of channel example

With reference to Fig. 1, die trial: the section bar that will treat stretch bending is installed on the stretch benders, fixes to clamp, and carries out stretch bending, and the stretch bending spare behind the stretch bending 2 and standard jig 1 are compared, and measures the value of stretch bending spare circular arc place and model gap 3;

With reference to Fig. 2, Fig. 3, Bonded Repair: according to the size making of gap width, the aluminium flake 4 of selecting thickness not wait, with industrial glue aluminium flake is sticked on the circular arc place of bending 5, the position that section bar is contacted with the bending circular arc is fully crooked in the stretch bending process, reaches the model requirement.

Claims

1. a bending Bonded Repair method is characterized in that comprising the following steps:

(1) die trial: the section bar that will treat stretch bending is installed on the stretch benders, fixes to clamp, and carries out stretch bending, and the stretch bending spare behind the stretch bending and standard jig are compared, and measures the gap width between stretch bending spare circular arc place and the model;

(2) Bonded Repair: according to the size making of gap width, the aluminium flake of selecting thickness not wait, aluminium flake is sticked on the circular arc place of bending with industrial glue, the position that section bar is contacted with the bending circular arc is fully crooked in the stretch bending process, reaches the model requirement.