CN1250695A

CN1250695A - Static-pressure forge technology for cast wheel

Info

Publication number: CN1250695A
Application number: CN 99115135
Authority: CN
Inventors: 杨嘉钦
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-09-13
Filing date: 1999-09-13
Publication date: 2000-04-19
Anticipated expiration: 2019-09-13
Also published as: CN1080151C

Abstract

The static-pressure forging process for cast wheel uses cold-forging or hot-forging method to implement radial forging and axial forging of workpiece so as to greatly raise heat conductivity of cast wheel, its heat-resisting fatigue strength and mechanical strength, and its finished product rate is high.

Description

Static-pressure forge technology for cast wheel

What the present invention relates to is a kind of Forging Technology, particularly be a kind of static-pressure forge technology for cast wheel.Cast wheel (crystallizing wheel) is the casting vital part of production of copper, aluminium bar apparatus-copper, aluminium bar continuous casting and tandem rolling machine, it must have good heat conductivity, thermal fatigue resistance intensity and mechanical strength, and particularly the copper bar continuous casting and tandem rolling machine is higher to the qualitative performance requirements of cast wheel.

At present, domestic how tame manufacturer all adopts fine copper and Cu alloy material, become the annular foundry goods through centrifugal casting, be processed into the finished product cast wheel through turning again, its interior tissue of cast wheel of technology manufacturing is loose thus, heat conductivity, thermal fatigue resistance intensity and bad mechanical property, the ingot casting that can only satisfy aluminium bar tandem mill reluctantly require (aluminium ingot ingot casting temperature is 750C °) and can't use (the copper ingot casting temperature is 1150C °) at all on copper bar tandem mill.

In view of above reason, the objective of the invention is in order to overcome above deficiency, provide a kind of and can improve casting roller heat conductivity, thermal fatigue resistance intensity, mechanical performance, the cast wheel static pressure casting technique that product qualified rate is high.

The object of the present invention is achieved like this:

Static-pressure forge technology for cast wheel of the present invention is with the method for cold forging or forge hot workpiece to be carried out radial forging and axially forging, and forging ratio is greater than adopting hot forging method more than 1.5, and forging ratio adopts the cold forging methods less than 1.5.

Be annulus to be made in workpiece blank-cast wheel casting in bronze be positioned between head and the rotating supporting when the present invention adopts radial forging, has elasticity, and but the clamper of move left and right is located piece-holder, head moves down, the degree of depth that is pressed into workpiece promptly moves up to the projected depth and leaves workpiece, unclamp clamper, start building part rotation of supporting strap, then piece-holder is located, head is repetitive operation once more, repeating above-mentioned action, till the workpiece circumference is all forged, is that the workpiece with radial forging places between head and following stirrup when axially forging, head moves down, move up when being pressed into workpiece to projected depth again behind the contact workpiece, the rotation travelling workpiece repeats pressing action, until the whole thickness of workpiece plane axial compression, finish axial forging process.

The distance of above-mentioned radial forging or the each rotation of workpiece when axially forging is less than the head width.

Temperature when the present invention adopts hot forging method that workpiece is forged is at least 500 ℃.

Temperature was 830 ℃ when the present invention adopted hot forging method that workpiece is forged.

All have can be upper and lower (horizontal) movement pressure head (swaging) for left and right, and have and can make pressure (forging) equipment of copper, copper alloy (copper content is more than 99%) distortion all can be used for the present invention.

Compare with existing Forging Technology, Forging Technology of the present invention has following advantage:

1, improve heat conductivity:

Annular cast is under the high pressure effect, and its interior tissue can obtain higher matter density (compare and bring up again height), has improved heat conductivity greatly.

2, improve thermal fatigue resistance intensity:

To annular cast carry out respectively axle, radially (thickness, diameter) apply uniform load, make its inside in deformation process, uniformity avoids stress to concentrate, and has improved thermal fatigue resistance intensity.

3, improve mechanical strength:

It is big to forge the sectional area deflection, 0.8 meter foundry goods of diameter can be forged to diameter more than 2 meters, and percentage elongation is big, has improved mechanical strength.

4, the yield rate height:

By the deflection of forger part, in advance as calculated, to forcing press depress accurately presetting of distance, to guarantee the final size of workpiece.

Introduce embodiments of the invention below:

Fig. 1 is the radial forging process schematic representation.

Fig. 2 is axial Forging Technology schematic diagram.

Embodiment 1:

Forge 2220 millimeters of finished product external diameter φ, 2050 millimeters of internal diameter φ, thickness are 140 millimeters.

Its Forging Technology is as follows:

1, workpiece-casting in bronze made its external diameter is 1140 millimeters of φ after the turning of annulus blank, 642 millimeters of internal diameter φ, 165 millimeters of thickness.

2, radial forging:

Workpiece 1 after turning is heated to 830 ℃ of forging temperatures, be positioned between the head 2 and supporting plug 3 as shown in Figure 1, has elasticity, and but the clamper 4 of move left and right is located workpiece 1 clamping, head 2 moves down, when contact workpiece, workpiece is stressed and is out of shape downwards, head is pressed into the degree of depth of workpiece for calculate the degree of depth (distance that moves down that presets in advance at every turn, the degree of depth is identical, and control automatically) by press device, promptly be moved upward to former desired location when head presses down for the first time after putting in place, unclamp clamper this moment, the supporting plug drives workpiece and rotates, workpiece rotary distance (being anglec of rotation chord length) is slightly less than the width L of head, clamper is located piece-holder then, and head repeats action for the first time again ... so repeat above-mentioned action, till the workpiece circumference is forged.This moment, workpiece external diameter φ was 1884 millimeters, 1522 millimeters of internal diameter φ, and thickness is constant substantially.

3, axially forge:

Workpiece through radial forging, waste heat (is looked its forging equipment automaticity, the length of forging time and decide) generally between 400～500 ℃, it is put into heating furnace immediately be heated to 830 ℃ again, the head 5 that the workpiece that is heated to forging temperature is positioned over as shown in Figure 2 reaches down between the stirrup 6, head moves down, be pressed into workpiece (pressing down the degree of depth presets in advance as calculated) behind the contact workpiece again, when pressing down preset position, arrival is moved upward to preset position, distance of rotational workpieces (this distance is less than the head width), action when head repeats to descend for the first time then, workpiece repeats above-mentioned same action ... so repeat above-mentioned action, until the whole pressurizeds of the whole thickness of workpiece, finish axial forging overall process.This moment, workpiece external diameter φ was 2220 millimeters, 2050 millimeters of internal diameter φ, and the amount of being pressed into of setting pressure equipment is 25 millimeters.

Embodiment 2:

The static pressure cold forging process is applicable to forging ratio less than 1.5 following workpiece, and workpiece plasticity is better, and the pressurized sectional area is less, does not heat, and directly forges by footpath, axially forging program respectively:

1, will cast copper coin ring blank and be machined to 1140 millimeters of outside diameter φ through turning (pulling out casting skin), 946 millimeters of internal diameter φ, thickness is 100 millimeters, is the preceding workpiece size of cold forging;

2, directly be positioned over position at normal temperatures with forging workpiece as Fig. 1, press the radial forging operation sequence among the embodiment 1, the workpiece external diameter is forged to 1270 millimeters of φ, 1096 millimeters of internal diameter φ, 100 millimeters of thickness are constant substantially;

3, again workpiece is positioned over position shown in Figure 2, make its thickness to 90 millimeter by axial forging operation program, promptly obtain 1410 millimeters of external diameter φ, 1240 millimeters of internal diameter φ, thickness are 90 millimeters forging finished product.

Claims

1, static-pressure forge technology for cast wheel is characterized in that described Forging Technology is with the method for cold forging or forge hot workpiece to be carried out radial forging and axially forging.

2, static-pressure forge technology for cast wheel according to claim 1, be annulus to be made in workpiece blank-cast wheel casting in bronze be positioned between head and the rotating supporting when it is characterized in that radial forging, has elasticity, and but the clamper of move left and right is located piece-holder, head moves down, the degree of depth that is pressed into workpiece promptly moves up to the projected depth and leaves workpiece, unclamp clamper, start building part rotation of supporting strap, then piece-holder is located, head is repetitive operation once more, repeating above-mentioned action, till the workpiece circumference is all forged, is that the workpiece through radial forging is placed between head and following stirrup when axially forging, head moves down, move up when being pressed into workpiece to projected depth again behind the contact workpiece, the rotation travelling workpiece repeats pressing action, until the whole thickness of workpiece plane axial compression, finish axial forging process.

3, static-pressure forge technology for cast wheel according to claim 2, it is characterized in that radial forging or the distance of the each rotation of workpiece when axially forging less than the head width.

4, according to claim 1 or 2 or 3 described static-pressure forge technology for cast wheel, the temperature when it is characterized in that adopting hot forging method that workpiece is forged is at least 500 ℃.

5, static-pressure forge technology for cast wheel according to claim 4, temperature is 830 ℃ when it is characterized in that adopting hot forging method that workpiece is forged.