CN102699262A

CN102699262A - Material converging method for G2500 crankshaft in pre-forging die

Info

Publication number: CN102699262A
Application number: CN2012101869797A
Authority: CN
Inventors: 蒋鹏; 余光中; 胡福荣; 曹飞; 杨勇
Original assignee: Beijing Research Institute of Mechanical and Electrical Technology
Current assignee: Beijing Research Institute of Mechanical and Electrical Technology
Priority date: 2012-06-07
Filing date: 2012-06-07
Publication date: 2012-10-03

Abstract

The invention provides a material converging method for a G2500 crankshaft in a pre-forging die. According to characteristics of various parts of a crank of a G2500 crankshaft forging, because the crank is wide, a die opposite to the wide crank is deep and is difficult to fill in the die forging process, and in order to completely fill the die in the finish forging process, the joint of a cavity of the pre-forging die and a cavity of a flash saddle is thickened in the pre-forging process, and the crank away from the periphery is radially shrunk, so that by the material converging method for the pre-forging die, the materials are converged to a die splitting surface along the periphery of the crank in the pre-forging process, and the crank is full in the finish forging process.

Description

The G2500 bent axle gathers the material method in the blocking mould

Technical field

The present invention provides a kind of G2500 bent axle in the blocking mould, to gather the material method; Promptly according to the characteristic of each position crank of G2500 crankshaft forging, because the crank broad, the crank corresponding position mould of broad is darker; In die forging process, be difficult to be full of; Intact in order to guarantee that the finish-forging process is full of, the place's of link thickening of blocking die cavity and overlap bridge portion die cavity in the blocking process, to around be radial and dwindle; Make material the die joint place gather crank around, be convenient to make in the finish-forging process each position of bent axle can both be full of method.

Background technology

Since the nineties, the automobile industry development of China is rapid.The advanced FMT of auto industry has driven the development of national die forging industry, and along with the increase year by year of auto output, the output of automobile forging also rises year by year.In the automobile forging, bent axle and front axle are maximum, also are most important forging, need set up the production of specialized die forging production line.

In the auto manufacturing, Production of Crankshaft is adopted two types of blanks in modern times, a kind of is the foundry goods of casting with spheroidal graphite cast-iron; Another kind is the steel forgings that forges with hot forging.Spheroidal graphite cast-iron because of its mechanical strength near or surpass medium carbon steel and cost is low, wearability is good, use wider in China.But casting crankshaft and crankshaft forging compare, and to same support width, the wearing and tearing of casting crankshaft supporting surface are very fast, and the noise of generation is higher, and the axial region seal failure is also very fast.And the forging bent axle can reduce the noise and the vibration of engine, improves the economy of fuel oil.In recent years; Automobile production just develops with the direction method that increases compression volume towards the average pressure that increases engine power, raising engine cylinder, reduction friction power loss, oversize piston stroke; Therefore, the ratio of casting crankshaft descends day by day, and the ratio of crankshaft forging day by day rises.Along with engine generally adopts supercharging technology, the output torque of bent axle strengthens, and crankshaft forging replaces casting crankshaft to become clear day by day.

The bent axle Forging Technology generally is blanking at present, and------roller forging sheet stamping---cut edge by blocking---finish-forging---in heating.The technology that generally adopts at present directly with the round bar heating, is carried out blocking and finish-forging on forcing press, and the crank broad of bent axle, all there is the problem that is not fully filled in present technology.In order to address this problem, the present invention innovates on blocker, material is accumulated in around each crank, to guarantee that bent axle is full of.Show in the practice that this technological full level is good.

Summary of the invention

The G2500 bent axle gathers the material method in the blocking mould; The Forging Technology of G2500 bent axle is divided into roller forging sheet stamping, three stations of blocking and finish-forging, and wherein blocking comprises upper die and lower die; The overlap of blocking patrix and blocking counterdie comprises bridge portion and chamber portion two parts; And the part that bridge portion links to each other with forging is gradient, and in the angle of inclination beta of the overlap bridge portion that is parallel to crankshaft center line crank place, its size is no more than 30 °; In the inclination angle theta perpendicular to the overlap bridge portion at crankshaft center line crank throw place, its size is no more than 30 °; Circumferentially be no more than 30 ° along 8 cranks to the inclination angle of overlap bridge portion; Overlap bridge portion inclination angle length d 1 perpendicular to crankshaft crank axis place is 107mm.

Description of drawings

Fig. 1 is the front view of G2500 bent axle blocking mould matched moulds state;

Fig. 2 is the preparatory forging drawing of G2500 bent axle;

Fig. 3 is a K1-K1 profile in the G2500 bent axle blocking spare die drawing 1;

Fig. 4 is a K-K profile among G2500 bent axle blocking spare Fig. 2;

Fig. 5 is a C-C profile among G2500 bent axle blocking spare Fig. 2;

The specific embodiment

Fig. 1 is the front view of G2500 bent axle blocking mould matched moulds state; Label 1 is the blocker patrix, and

label

3 and 8 is shaft shoulders of bent axle, and

label

4,5,6,7 is four crank throws of bent axle blocking spare; Like Fig. 1, shown in Figure 2; 00-00 is the die joint of G2500 bent axle blocking spare, also is the axis of bent axle, and the meaning of identical label representative is identical in the present embodiment.Fig. 2 is the preparatory forging drawing of G2500 bent axle, and the axle at

crank throw

4,5,6,7 places is axle B, and B1, B2, B3, B4 are respectively the labels of the axle of crank throw 4,7,6,5 place's different parts, and label A1, A2, A3, A4, A5, A6, A7, A8 are respectively 8 cranks of bent axle.Fig. 3 is a K1-K1 profile in the G2500 bent axle blocking spare die drawing 1; Label d is the height of overlap bridge portion; Label β is the inclination angle that is parallel to the overlap bridge portion at crankshaft center line, crank place, and β 1, β 2, β 3 are the inclination angle that different cranks place is parallel to crankshaft center line, and its angle is no more than 30 °.Fig. 4 is a K-K profile in the preparatory forging drawing of G2500 bent axle, and the location drawing of this forging is the location drawing that is placed on the die drawing among Fig. 1.Fig. 5 is a C-C profile among G2500 bent axle blocking spare Fig. 2; D1 is that the center line of axle B at crank throw place is to the distance of the intersection of θ and the overlap bridge d of portion; Be the inclination angle length D=107mm of overlap bridge portion, θ is that its size is no more than 30 ° perpendicular to the inclination angle of the overlap bridge portion at crankshaft center line crank throw place; The angle of overlap bridge portion is circumferentially arrived on the edge of 8 crank A1, A2, A3, A4, A5, A6, A7, A8, and its size is no more than 30 °.

The above is merely preferred embodiment of the present invention, and all changes of being made with claim of the present invention all should belong to covering scope of the present invention.

Claims

1.G2500 bent axle gathers the material method in the blocking mould; The Forging Technology of G2500 bent axle is divided into roller forging sheet stamping; Three stations of blocking and finish-forging, wherein blocking comprises upper die and lower die, the overlap of blocking patrix and blocking counterdie comprises bridge portion and chamber portion two parts; And the part that bridge portion links to each other with forging is gradient, it is characterized in that.

2. G2500 bent axle as claimed in claim 1 gathers the material method in the blocking mould, in the angle of inclination beta of the overlap bridge portion that is parallel to crankshaft center line crank place, its size is no more than 30 °.

3. G2500 bent axle as claimed in claim 1 gathers the material method in the blocking mould, in the inclination angle theta perpendicular to the overlap bridge portion at crankshaft center line crank throw place, its size is no more than 30 °.

4. G2500 bent axle as claimed in claim 1 gathers the material method in the blocking mould, circumferentially be no more than 30 ° to the inclination angle of overlap bridge portion along 8 cranks.

5. G2500 bent axle as claimed in claim 1 gathers the material method in the blocking mould, be 107mm in the overlap bridge portion inclination angle length d 1 perpendicular to crankshaft crank axis place.