CN104259789A - Preparation method of two-sheet aluminum alloy rim - Google Patents

Abstract

The invention discloses a preparation method of a two-sheet aluminum alloy rim. The preparation method includes the steps: preparing materials: placing a 6061 aluminum bar into an electric heating furnace, insulating the aluminum bar for at least three hours at the temperature of 500-550 DEG C, and heating a ring grinding mould to reach the temperature of 200-300 DEG C and keeping the temperature; placing the heated aluminum bar on an air hammer for upsetting to form a coarse material, and punching a center hole in the center of the coarse material; transferring the coarse material with the center hole onto a ring rolling mill for rolling a ring to form a ring rolling blank; placing the ring rolling blank into a spinning mould for spinning to form a semi-finished product; performing heat treatment and machining for the formed semi-finished product to form a finished product. The diameter of the 6061 aluminum bar ranges from 180mm to 250mm, the height of the coarse material is 1/2-2/3 of that of a hub needing to be formed, the diameter of the center hole ranges from 100mm to 150mm, and the diameter of the ring rolling blank reaches that of the hub needing to be prepared. The preparation method has the advantages of simplicity, high material use ratio and low cost.

Description

The preparation method of aluminium alloy two-chip type wheel rim

Technical field

The present invention relates to a kind of preparing technical field of automobile rim, especially relate to a kind of preparation method of aluminium alloy two-chip type wheel rim.

Background technology

Aluminium alloy two-chip type wheel rim fully can meet the individual demand of driver's uniqueness, thus it is more and more applied on racing car, offroad vehicle, bus and high-grade car.At present, the preparation method of this aluminium alloy two-chip type wheel rim mainly comprises: get the raw materials ready, clean, aluminium bar heating and thermal insulation, mold heated, bar carried out die forging in insulating process, and, then the step such as cutter point, again heating, spinning under car.The method stock utilization only has 20%, and expend again machined man-hour in a large number, production cost is too large.In other words, current method complex process, material yield rate are low, cost remains high.

Summary of the invention

The present invention is to provide a kind of preparation method of aluminium alloy two-chip type wheel rim, and it has, and method is simple, stock utilization is high, lower-cost feature.

The technical solution adopted in the present invention is: the preparation method of aluminium alloy two-chip type wheel rim, comprises the following steps:

(1) get the raw materials ready: be that electric furnace put into by 6061 aluminium bars of 180 ~ 250mm by diameter, rolling ring mold heated is incubated to 200 ~ 300 DEG C with 500 ~ 550 DEG C of temperature at least 3 hours, meanwhile;

(2) aluminium bar after heating is placed on pneumatic hammer forges and slightly forms coarse fodder, make it highly reach 1/2 ~ 2/3 of the height of the wheel hub that will be formed, and go out at the center of coarse fodder the centre bore that diameter is 100 ~ 150mm;

(3) in 60 ~ 90 seconds, the coarse fodder with centre bore that step (2) is formed is transferred on the ring rolls of D51 ~ 350 and carry out rolling ring formation rolling ring blank, and the diameter of this rolling ring blank reaches the diameter of the wheel hub of required preparation;

(4) rolling ring blank is put on spinning mold and carry out spinning formation semi-finished product;

(5) semi-finished product formed step (4) are heat-treated and are made finished product with machined.

The present invention is compared to the prior art advantageously: method is simple, stock utilization is high, cost is lower.Preparation method's rolling ring ejection of aluminium alloy two-chip type wheel rim of the present invention instead of die forging ejection technique, decrease the unstability of the material structure produced because of Repeat-heating in forging process, ensure that the stability of metallographic structure and prevent grain size because repeatedly heating and thick defect.Meanwhile, put english by rolling ring and be pressed with effect and improve stock utilization, improve production efficiency, add the density at wheel rim position.And, decrease mould and drop into: according to statistics, average 3000 ~ 5000 of forging die life-span, and rolling ring mould average life span 7000 ~ 9000 times; Decrease the investment cost of equipment, ring rolls only has 1/10 of forging press price; Decrease the problem of workpiece Repeat-heating, save energy consumption in a large number.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the present invention is further described:

Fig. 1 a is the schematic front view of the thick front and back of bar of the present invention forging;

Fig. 1 b is the front sectional view (not shown Section line) going out the coarse fodder of centre bore of the present invention

Fig. 2 is the operating diagram that rolling ring blank of the present invention is formed;

Fig. 3 is the operating diagram of mould pressing of the present invention.

Detailed description of the invention

Embodiment 1

The preparation method of aluminium alloy two-chip type wheel rim, comprises the following steps:

(1) getting the raw materials ready: see shown in Fig. 1 a, is that electric furnace put into by 6061 aluminium bars of 180mm by diameter, rolling ring mold heated is incubated to 200 DEG C with 500 DEG C of temperature 3 hours, meanwhile;

(2) aluminium bar after heating is placed on pneumatic hammer forges and slightly forms coarse fodder, make it highly reach 1/2 of the height of the wheel hub that will be formed, and go out at the center of coarse fodder the centre bore that diameter is 100mm, specifically see shown in Fig. 1 b;

(3) in 60 seconds, the coarse fodder with centre bore that step (2) is formed is transferred on the ring rolls of D51 ~ 350 and carry out rolling ring formation rolling ring blank, and the diameter of this rolling ring blank reaches the diameter of the wheel hub of required preparation, as shown in Figure 2;

(4) put into by rolling ring blank on spinning mold and carry out spinning formation semi-finished product, the object of spinning is that blank is revolved thin elongation, until the size required for billet size to product blank, as shown in Figure 3;

(5) semi-finished product formed step (4) carry out normative heat treatment and finished product is made in machined.

Embodiment 2

The preparation method of aluminium alloy two-chip type wheel rim, comprises the following steps:

(1) getting the raw materials ready: see shown in Fig. 1 a, is that electric furnace put into by 6061 aluminium bars of 220mm by diameter, rolling ring mold heated is incubated to 300 DEG C with 530 DEG C of temperature 5 hours, meanwhile;

(2) aluminium bar after heating is placed on pneumatic hammer forges and slightly forms coarse fodder, make it highly reach 2/3 of the height of the wheel hub that will be formed, and go out at the center of coarse fodder the centre bore that diameter is 150mm, specifically see shown in Fig. 1 b;

(3) in 90 seconds, the coarse fodder with centre bore that step (2) is formed is transferred on the ring rolls of D51 ~ 350 and carry out rolling ring formation rolling ring blank, and the diameter of this rolling ring blank reaches the diameter of the wheel hub of required preparation, as shown in Figure 2;

(4) put into by rolling ring blank on spinning mold and carry out spinning formation semi-finished product, the object of spinning is that blank is revolved thin elongation, until the size required for billet size to product blank, as shown in Figure 3;

(5) semi-finished product formed step (4) carry out normative heat treatment and finished product is made in machined.

Embodiment 3

The preparation method of aluminium alloy two-chip type wheel rim, comprises the following steps:

(1) getting the raw materials ready: see shown in Fig. 1 a, is that electric furnace put into by 6061 aluminium bars of 250mm by diameter, rolling ring mold heated is incubated to 250 DEG C with 550 DEG C of temperature 8 hours, meanwhile;

(2) aluminium bar after heating is placed on pneumatic hammer forges and slightly forms coarse fodder, make it highly reach 7/12 of the height of the wheel hub that will be formed, and go out at the center of coarse fodder the centre bore that diameter is 130mm, specifically see shown in Fig. 1 b;

(3) in 80 seconds, the coarse fodder with centre bore that step (2) is formed is transferred on the ring rolls of D51 ~ 350 and carry out rolling ring formation rolling ring blank, and the diameter of this rolling ring blank reaches the diameter of the wheel hub of required preparation, as shown in Figure 2;

(4) put into by rolling ring blank on spinning mold and carry out spinning formation semi-finished product, the object of spinning is that blank is revolved thin elongation, until the size required for billet size to product blank, as shown in Figure 3;

(5) semi-finished product formed step (4) carry out normative heat treatment and finished product is made in machined.

In sum, preparation method's ring rolling of aluminium alloy two-chip type wheel rim of the present invention adds the new technology of spinning, and acquisition production cost is low, the aluminium alloy two-chip type wheel rim of quality better.Adopt aluminum alloy materials (6061) bar, on the ring rolls of D51 ~ 350, carry out disposablely rolling out ring; Elongating required size by carrying out spinning to wheel rim position again, further increasing material density, turn improving material yield rate 40%.For 19 cun of wheel rims, contour forging technique originally needs consumptive material 36 kilograms, as long as and 22 kilograms now; Improve production efficiency one times, equally for 19 cun of wheel rims, originally 6 minutes one, as long as 3 minutes now one, save labour 50%; Add die life, equally for 19 cun of wheel rims, originally the stamp forging mould life-span 4000, can reach 8000 now, there is good economic benefit and social benefit.

The foregoing is only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize description of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.

Claims (1)

1. the preparation method of aluminium alloy two-chip type wheel rim, comprises the following steps:

(1) get the raw materials ready: be that electric furnace put into by 6061 aluminium bars of 180 ~ 250mm by diameter, rolling ring mold heated is incubated to 200 ~ 300 DEG C with 500 ~ 550 DEG C of temperature at least 3 hours, meanwhile;

(2) aluminium bar after heating is placed on pneumatic hammer forges and slightly forms coarse fodder, make it highly reach 1/2 ~ 2/3 of the height of the wheel hub that will be formed, and go out at the center of coarse fodder the centre bore that diameter is 100 ~ 150mm;

(3) in 60 ~ 90 seconds, the coarse fodder with centre bore that step (2) is formed is transferred on the ring rolls of D51 ~ 350 and carry out rolling ring formation rolling ring blank, and the diameter of this rolling ring blank reaches the diameter of the wheel hub of required preparation;

(4) rolling ring blank is put on spinning mold and carry out spinning formation semi-finished product;

(5) semi-finished product formed step (4) are heat-treated and are made finished product with machined.