A kind of driving axle housing integral forming method
technical field:
The present invention relates to tube extrusion forming technique field, be specifically related to a kind of driving axle housing integral forming method.
background technology:
Current automotive light weight technology is developing direction, driving axle housing is as one of of paramount importance parts of car load, for the basic part of Automobile drive and carrying, directly affect the important performances such as the bearing capacity of heavy goods vehicles, transport capacity and security, facilitate driving axle housing light-weight design under guarantee stiffness and strength prerequisite, need more effective technological forming scheme.The moulding process of driving axle housing mainly adopts casting technique and punch welding technique at present, and casting technique existing defects is that stock utilization is low, quality heavy, percent defective is high; Punch welding existing defects: with axle housing body welding forming after the first forging and molding of its spindle nose part, its spindle nose welding position easily ruptures, and technique is loaded down with trivial details, and axle housing anti-fatigue performance can be caused to reduce because of welding deformation, affect service life.
summary of the invention:
The object of the present invention is to provide a kind of production technology simple, axle housing body and spindle nose are an entirety, do not have a kind of driving axle housing integral forming method of direct weld seam.
The technical solution used in the present invention is: a kind of driving axle housing integral forming method, it is characterized in that the method comprises following operation:
1), blanking: getting the circular seamless pipe of 20Mn2 is the base material preparing driving axle housing, and diameter according to demand, wall thickness, length are carried out blanking and obtained central siphon;
2), Frequency Induction Heating: medium frequency induction heater is put at above-mentioned central siphon two ends and heats, central siphon two ends are heated to 850 DEG C-1000 DEG C;
3), spindle nose thickens: the central siphon after the heating of above-mentioned two ends is delivered to location clamping in extrusion equipment, extruder both sides thicken mould relative movement, the central siphon after being heated at two ends is thickening compression and thickening in mould;
4), spindle nose is shaping: the central siphon after being thickened by above-mentioned spindle nose is delivered to location in spindle nose extrusion moulding machine, clamping, and the spindle nose shaping dies relative movement of extrusion moulding machine both sides, by central siphon two ends extrusion molding in spindle nose shaping dies;
5), the pipe side of pushing away: the circular central portion of the central siphon after being shaped by above-mentioned spindle nose becomes square tube through rolled by cold rolling machine;
6), fabrication hole is opened: strip fabrication hole is offered at the middle part of the central siphon opposite face behind the above-mentioned side of pushing away;
7), Frequency Induction Heating: above-mentioned opening is put into medium frequency induction heater in the middle part of the central siphon after fabrication hole and heated, and central siphon is heated to 850 DEG C-1000 DEG C;
8), flange hole is shaped: be delivered in flange hole forming machine by the central siphon after the heating of above-mentioned middle part, start the hydraulic pump at two ends with the axial precompression 250 ± 20T of oil cylinder, two ends to central siphon apply axial compressive force, make the critical condition being in distortion in the middle part of central siphon, middle part diffusion frock enters central siphon fabrication hole position radial component simultaneously, radial component makes the material in the middle part of central siphon extend to external expansion, to the driving axle housing of preliminary dimension shape;
9), shaping: the driving axle housing after being shaped by above-mentioned flange hole is transported in shaping mould, carries out compacting shaping, makes the linearity of flange hole size and driving axle housing reach drawing requirement.
Described operation 1) in the base material of driving axle housing be No. 45 steel hot rolled seamless steel tubes.
Described operation 1) in the base material of driving axle housing be 40Cr hot rolled seamless steel tube.
As preferably, described operation 4) in spindle nose be shaped by twice extrusion molding.
As preferably, described operation 8) in flange hole be shaped and be shaped by twice diffusion.
The invention has the advantages that: by adopting the synchronous hot extrusion molding in seamless steel pipe two ends, middle heat expansion shaped insertion-type technique, technique is simple, saves welding procedure, axle housing body and spindle nose are an entirety, and do not have direct weld seam, axle housing bulk strength is high; Increase spindle nose thickens operation and makes spindle nose intensity enhancing, avoids spindle nose to rupture; Increase trimming, make driving axle housing appearance and size precision higher, more can meet drawing requirement.
accompanying drawing illustrates:
Below in conjunction with the drawings and specific embodiments, the present invention is described in further details:
Fig. 1 is a kind of driving axle housing integral forming method of the present invention operation 1) schematic diagram;
Fig. 2 is a kind of driving axle housing integral forming method of the present invention operation 2) schematic diagram;
Fig. 3 is a kind of driving axle housing integral forming method of the present invention operation 3) schematic diagram;
Fig. 4 is a kind of driving axle housing integral forming method of the present invention operation 4) schematic diagram;
Fig. 5 is a kind of driving axle housing integral forming method of the present invention operation 5) schematic diagram;
Fig. 6 is a kind of driving axle housing integral forming method of the present invention operation 6) schematic diagram;
Fig. 7 is a kind of driving axle housing integral forming method of the present invention operation 7) schematic diagram;
Fig. 8 is a kind of driving axle housing integral forming method of the present invention operation 8) schematic diagram;
Fig. 9 is a kind of driving axle housing integral forming method of the present invention operation 9) schematic diagram.
detailed description of the invention:
A kind of driving axle housing integral forming method of the present invention, the method comprises following operation:
1), blanking: as shown in Figure 1, under to get external diameter be φ 200, wall thickness is the hot rail seamless pipe of 20Mn2 of 14mm is the central siphon preparing driving axle housing;
2), Frequency Induction Heating: as shown in Figure 2, above-mentioned central siphon two ends are put into medium frequency induction heater (1) heating, central siphon two ends are heated to 850 DEG C-1000 DEG C, 3.5 minutes heat times, heated length 500mm;
3), spindle nose thickens: as shown in Figure 3, central siphon after the heating of above-mentioned two ends is delivered in extrusion equipment with clamping device (3) clamping, extruder both sides thicken mould (2) relative movement, the central siphon after being heated at two ends is thickening compression and thickening in mould (2);
4), spindle nose is shaping: as shown in Figure 4, central siphon after being thickened by above-mentioned spindle nose is delivered in spindle nose extrusion moulding machine with clamping device (5) clamping,, spindle nose shaping dies (4) relative movement of extrusion moulding machine both sides, by central siphon two ends extrusion molding in spindle nose shaping dies (4);
5), the pipe side of pushing away: as shown in Figure 5, the circular central portion of the central siphon after being shaped by above-mentioned spindle nose becomes square tube through rolled by cold rolling machine;
6), open fabrication hole: as shown in Figure 6, the bar shaped fabrication hole that two length are 650mm is offered at the middle part of the central siphon opposite face behind the above-mentioned side of pushing away;
7), Frequency Induction Heating: as shown in Figure 7, above-mentioned opening in the middle part of the central siphon after fabrication hole is put into medium frequency induction heater (6) heating, and central siphon is heated to 850 DEG C-1000 DEG C, 3.5 minutes heat times, heated length 600mm;
8), flange hole is shaped: as shown in Figure 8, central siphon after the heating of above-mentioned middle part is delivered in flange hole forming machine, start the hydraulic pump at two ends with the axial precompression 250 ± 20T of oil cylinder (7), two ends to central siphon apply axial compressive force, make the critical condition being in distortion in the middle part of central siphon, middle part diffusion frock (8) enters central siphon fabrication hole position radial component simultaneously, and radial component makes the material in the middle part of central siphon extend to external expansion, to the driving axle housing of preliminary dimension shape;
9), shaping: as shown in Figure 9, the driving axle housing after being shaped by above-mentioned flange hole is transported in shaping mould (9), carries out compacting shaping, makes the linearity of flange hole size and driving axle housing reach drawing requirement.
Described operation 1) in the base material of driving axle housing be No. 45 steel hot rolled seamless steel tubes.
Described operation 1) in the base material of driving axle housing be 40Cr hot rolled seamless steel tube.
As preferably, described operation 4) in spindle nose be shaped by twice extrusion molding.
As preferably, described operation 8) in flange hole be shaped and be shaped by twice diffusion.
Above-mentioned embodiment, as preferred embodiment of the present invention, is not used for limiting the scope of the invention.