CN102756029A - Hot-press forming method of rear axle half shell of automobile - Google Patents

Abstract

The invention relates to a hot-press forming method of a rear axle half shell of an automobile. The hot-press forming method is characterized by comprising the following steps of: heating a plate by a feed-through electrical heating furnace, wherein the heating temperature is 750-850 DEG C, and the thermal shrinkage ratio of the size of cavities of a male die and a female die of a hot-pressing forming mould is 1.0-1.2 percent; manufacturing a spherical surface at a lute circular part of a female die port of the hot-press forming mould of the rear axle half shell, forming an angle of slope of 15 degrees on other parts and then connecting a female die round corner of R30; manufacturing the male die and the female die with heat-resistant alloy steel 5GrNiMo, mounting a male die insert, a female die insert and an ejector insert on respective mounting plates by using a combined insert mounting structure in the mould respectively, remaining a gap of 1.5-2 mm between the inserts as expansion amount for the inserts at high temperature and maintaining the pressure for 5 seconds. The product with a triangle shape is subjected to one-time hot-press forming, a process of welding a triangle is not required any longer, the product cost is reduced, and a large amount of capital is saved for enterprises.

Description

Automobile axle half shells by hot forming method

Technical field

The present invention relates to a kind of automobile axle half shells by hot forming method, belong to the drop stamping field.

Technical background

Traditional truck vehicle bridge is a cast article, in order to enhance productivity, reduce weight, gains in strength, the hot-forming half shell welding method of external popular employing thick blanks.Domestic still do not have an axle housing hot extrusion briquetting technique, particularly with the automobile axle half shells by hot forming technology of set square.

Summary of the invention

The object of the present invention is to provide a kind of automobile axle half shells by hot forming method, its material that adopts is: ST540, SS4000; Sheet thickness is: 12mm-16mm; Solved plate heating-up temperature, product hot contraction ratio, punch and die gap effectively, mould die degree of lip-rounding shape, debugging moulding dwell time, once hot-forming for the product of band set square shape; No longer need weld the technical process of set square, reduce product cost.

Technical scheme of the present invention is achieved in that a kind of automobile axle half shells by hot forming method, it is characterized in that concrete step is following:

At first by through type electric furnace heating plate, heating-up temperature is 750-850 ℃, and the heat pressing and molding mold of back axle half shell is protruding, the thermal contraction ratio of concave die cavity size is 1.0-1.2%;

Secondly back axle half shells by hot forming mould mainly is made up of parts such as punch, die, backing-out punch, punch installing plate, die installing plate, backing-out punch installing plate, location-plate, guide pillar, lining, upper and lower base plates; Plate after the heating is placed on the die, and under the effect of press, punch is pressed into the die moulding with plate; The axle housing moulding ejects the die mouth by backing-out punch with product, above by playing the bar material returned after finishing; Flow in order to be beneficial to sheet material, the Chinese lute circle place of die mouth produces sphere, and other part is made the die entrance that meets R30 after 15 ° of slope angles again; Because of heating makes the sheet material thickening, the punch profile is pressed product shape processing, and it is thick that the empirical value in die and backing-out punch shape face and punch profile gap is that 1.1-1.3 doubly expects;

Protruding once more, die material adopts heat-resisting alloy steel 5GrNiMo; Air hardening makes protruding, die Hardness Control between HRC40-45, in mould, adopts the aggregate erection formula structure of inserting; Soon punch insert, die plate insert, backing-out punch are inserted and are installed in respectively on the installing plate separately; And between inserting, leave the gap of 1.5mm-2mm, as the stroke of inserting at high temperature, the dwell time is 5 seconds.

Good effect of the present invention is that its part accuracy can satisfy the product tolerance, and once hot-forming for the product of band set square shape, the technical process that no longer need weld set square reduces product cost, for enterprise has practiced thrift substantial contribution.

Description of drawings

Fig. 1 is the back axle product sketch map of invention.

Fig. 2 is the front view of back axle of the present invention.

Fig. 3 is the sectional view of back axle of the present invention.

The specific embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is done further description:

Embodiment 1

Because automobile axle half shell is at plate heated condition compacted under, entrucking is at room temperature used, and the heat pressing and molding mold of back axle half shell is protruding, the concave die cavity size will be considered a thermal contraction ratio, and thermal contraction ratio is confirmed as 1.0-1.2%.

Back axle half shells by hot forming mould mainly is made up of parts such as punch, die, backing-out punch, punch installing plate 4, die installing plate 5, backing-out punch installing plate 6, upper plate 7, lower shoes 8.Plate after the heating is placed on the die, and under the effect of press, punch is pressed into the die moulding with plate.The axle housing moulding ejects the die mouth by backing-out punch with product, above by playing the bar material returned after finishing.Flow in order to be beneficial to sheet material, die mouth 9 is transformed, the place produces sphere at the Chinese lute circle, and other part is made the die entrance that meets R30 after 15 ° of slope angles again.Because of heating makes the sheet material thickening, the punch profile is pressed product shape processing, and it is thick that the empirical value in die and backing-out punch shape face and punch profile gap is that 1.1-1.3 doubly expects.

Protruding, die material adopts heat-resisting alloy steel 5GrNiMo, and air hardening makes protruding, die Hardness Control (quenching hardness is too high, in use can burst) between HRC40-45, increases wearability, improves service life.In order to solve the difficult problem that mould at high temperature expands and needs often to keep in repair; In mould, adopt the aggregate erection formula structure of inserting; Being about to punch insert 1, die plate insert 2, backing-out punch inserts on 3 installing plates that are installed in respectively separately; And between inserting, leave the gap of 1.5mm-2mm, as the stroke of inserting at high temperature, obtained good effect aborning.This aggregate erection formula structure of inserting, not only easy to maintenance, also can when producing the two or more profiles product close, only change working portion, shared upper and lower bottom plate with size.So promptly can reduce die cost, can reduce the manufacturing cycle again, can also practice thrift and use producer to deposit the floor space of mould.

With a vapour vehicle back axle half shells by hot forming is example: like Fig. 1 is this vehicle back axle half shell product figure; Its material is: HT540; Sheet thickness is: 16mm; At first by through type electric furnace heating plate, heating-up temperature is 850 ℃, and the heat pressing and molding mold of back axle half shell is protruding, the thermal contraction ratio initial setting of concave die cavity size is 1.1%; Mainly constitute like Fig. 2, Fig. 3 back axle half shells by hot forming mould by parts such as punch, die, backing-out punch, punch installing plate 4, die installing plate 5, backing-out punch installing plate 6, upper plate 7, lower shoes 8; Plate after the heating is placed on the die, and under the effect of press, punch is pressed into the die moulding with plate.The axle housing moulding ejects die mouth 9 by backing-out punch with product, above by playing the bar material returned after finishing; Because this product corner shape is bevel (not being with set square), flow in order to be beneficial to sheet material, only die mouth 9 has been carried out the transformation that connects the die entrance of R30 after 15 ° of slope angles again,

Concrete technological process is: plate is heated to 850 ℃ in the through type electric furnace; Be put on the die mouth, the plate profile contacts the location with location-plate, and punch insert 1 is descending under press slide drives; Plate after the heating is pressed into moulding in the die mouth 9; The static pressurize of press bottom dead centre 5 seconds, punch insert 1 press slide drive up down in, air cushion ejects die mouth 9 through the product of pressure pin promotion backing-out punch after with moulding under the press; For preventing that product from wrapping on the punch insert 1, above by playing the bar material returned.Product after the moulding is taken off the placement cooling from mould, accomplish the drop stamping moulding of back axle half shell to this.

Embodiment 2

The heat pressing and molding mold of back axle half shell is protruding, the thermal contraction ratio initial setting of concave die cavity size is 1.1%; In mould, adopt the aggregate erection formula structure of inserting; Being about to punch insert 1, die plate insert 2, backing-out punch inserts on 3 installing plates that are installed in respectively separately; And between inserting, leave the gap of 1.5mm-2mm, as the stroke of inserting at high temperature, obtained good effect aborning.Shown in Fig. 2, accompanying drawing 3, the plate after the heating is placed on the die that is assembled by die plate insert 2, and under the effect of press, the punch that is assembled by punch insert 1 is pressed into moulding in the die with plate.After the axle housing moulding finishes, by backing-out punch product is ejected die mouth 9, above by playing the bar material returned; If axle housing corner shape band set square shape then needs produce at Chinese lute circle place the sphere of S50, other part to make the die entrance that meets R30 after 15 ° of slope angles again, intersection smooth transition; Because of heating makes the sheet material thickening, the punch profile is pressed the processing of product shape, and it is thick that 1.15 times of material are got by experience in die and backing-out punch shape face and punch profile gap.

Embodiment 3

Back axle half shell product of certain 2 vehicle, length dimension is respectively 1494mm and 1487mm, and axle housing the widest part is all 158mm, and the key dimension difference is Chinese lute radius of circle R250mm and R212.5mm.When producing these two kinds of profiles product close with size; Because product yield is not high,, the manufacturing cycle can be reduced again for reducing die cost; Can also practice thrift and use producer to deposit the floor space of mould; Taked two kinds of product punch installing plates 4, die installing plate 5, backing-out punch installing plate 6 and the identical scheme of outer profile size design that upper plate 7 and lower shoe 8 match are realized only changing working portion, a shared cover upper and lower bottom plate 8.

Claims (1)

1. automobile axle half shells by hot forming method is characterized in that concrete step is following:

At first by through type electric furnace heating plate, heating-up temperature is 750-850 ℃, and the heat pressing and molding mold of back axle half shell is protruding, the thermal contraction ratio of concave die cavity size is 1.0-1.2%;

Secondly back axle half shells by hot forming mould mainly is made up of parts such as punch, die, backing-out punch, punch installing plate, die installing plate, backing-out punch installing plate, location-plate, guide pillar, lining, upper and lower base plates; Plate after the heating is placed on the die, and under the effect of press, punch is pressed into the die moulding with plate; The axle housing moulding ejects the die mouth by backing-out punch with product, above by playing the bar material returned after finishing; Flow in order to be beneficial to sheet material, the Chinese lute circle place of die mouth produces sphere, and other part is made the die entrance that meets R30 after 15 ° of slope angles again; Because of heating makes the sheet material thickening, the punch profile is pressed product shape processing, and it is thick that the empirical value in die and backing-out punch shape face and punch profile gap is that 1.1-1.3 doubly expects;

Protruding once more, die material adopts heat-resisting alloy steel 5GrNiMo; Air hardening makes protruding, die Hardness Control between HRC40-45, in mould, adopts the aggregate erection formula structure of inserting; Soon punch insert, die plate insert, backing-out punch are inserted and are installed in respectively on the installing plate separately; And between inserting, leave the gap of 1.5mm-2mm, as the stroke of inserting at high temperature, the dwell time is 5 seconds.

Images