The composite extruding fine-punching formation method of a kind of processing low-plasticity or thick-plate parts and mould
Technical field
The invention belongs to the sheet forming technology, be specifically related to a kind of fine-punching formation technology.
Background technology
Existing fine-punching formation technology has powerful flanging fine blanking technology, subtend die fine blanking technology etc., and they each have its pluses and minuses and accommodation:
1. powerful flanging fine blanking technology is a separation circuit from see in form, but in fact workpiece with remain before billot in the end separates as a whole.Essence is broken through the process that journey is a plastic deformation, and the part of processing has that dimensional uniformity is good, and the shear surface roughness can reach Ra3.6~0.2, and collapse angle and burr are all than advantages such as common stamping part are little.Its shortcoming is to process cut deal inductile part.
2. smart the dashing of subtend die grows up on the basis in powerful flanging essence, towards unmanageable part, can adopt subtend die essence to dash for the powerful flanging essence of the thicker employing of the relatively poor thickness of material plasticity.Its shortcoming is because on protruding die and the die size or install, or the reason of kinematic error, essence towards the time as easy as rolling off a logly on section, leave a trace, cause cross section quality poor.
Summary of the invention
The objective of the invention is to the deficiency that exists at prior art, a kind of composite extruding fine-punching formation method and mould of processing low-plasticity thick-plate parts is provided, not only can the processing low-plasticity slab, and can obtain the good part of section uniformity.
Technical scheme of the present invention is as follows:
The shaped device that this composite extruding fine-punching formation method adopted comprises pressing plate, punch, die and anti-top board etc., and v shaped ring E is arranged on the pressing plate, has corresponding V-shaped groove F on the die, and method comprises step:
The first step: stripper plate is relative with punch to be locked and moves downward, and v shaped ring enters blank fully, and a part of blank flows into the die V-shaped groove.
Second step: stripper plate and punch continue descending, the blank waste part is extruded fully, material flows in the die cavity of die in a large number simultaneously, and anti-top board is forced to back off, and wherein the sub-fraction material is gone in the shallow die cavity of stripper plate by backward extrusion, shallow depth of cavity is the angle thickness that collapses of workpiece, in this process, waste material is under the Compound Extrusion effect, and major part radially outwards flows, a part enters V-shaped groove, and sub-fraction is radially to center flow.When outer blank by ironed to about thickness 2/3 the time (concrete size is determined according to material character and part thickness) pressing plate stop descending.
The 3rd step: stripper plate keep-ups pressure, invariant position, and punch is downward, and blank enters die under the forward extrusion effect.
The 4th step: the mould die sinking, with anti-top board part to be released, the composite extruding fine-punching process finishes.
Advantage of the present invention shows following several aspect:
1. the good product quality of Huo Deing: dimensional tolerance is IT8~7 grade, and the shear surface roughness can reach 0.8um~0.4um, and the essence of being produced can be directly used in the assembling of machinery towards part, saves subsequent handling.
2. can process inductile, thick-plate parts that existing fine blanking technology is difficult to processing.In the composite extruding fine-punching process, plastic deformation does not occur over just the place that separates of part and waste material, and bigger plastic deformation has also taken place in the waste material zone.One of main feature of composite extruding fine-punching is exactly that its pressing plate is broken through in the journey in essence waste material has been carried out Compound Extrusion, impel waste material to produce plasticity depletion, to around waste material almost can't redeformation, at this moment, when punch moves downward again just as forward extrusion workpiece in rigid cylinder, thereby the essence of high-carbon steel part 3mm that has substantially exceeded fine blanking technology processing is towards the limit, and can obtain high surface quality.
3. workpiece section uniformity is fine, can not produce burr.In composite extruding fine-punching technology, pressing plate indent (the being shallow die cavity) degree of depth is the angle thickness that collapses of workpiece, and the two-sided angle of collapsing has appearred in the extruding at two, has removed the chamfer machining of two part end faces from, has saved man-hour.
4. can enhance productivity, save production equipment.Dash can only working plastic material because existing gear ring pressing plate is smart, thickness can not be too big (domestic can only arrive 12mm), China adopts mechanical processing technique mostly for the inductile thick-plate parts at present, if adopt composite extruding fine-punching technology, production efficiency can greatly improve, and, therefore can save equipment such as milling machine, grinding machine because part just has Grinding Machining Quality after essence has been dashed.
This method has extraordinary application prospect aspect the inductile thick-plate parts processing such as high-carbon steel.
Description of drawings
Fig. 1 is the shaped device state diagram that realizes each step of this manufacturing process;
Wherein: a of Fig. 2, b, c, d are the shaped device state diagram in first, second, third and fourth step of method successively.
The specific embodiment
Shaped device such as Fig. 1 that this method adopts show that it is made up of pressing plate 1, die 3, punch 4 and anti-top board 5.V shaped ring E is arranged on the pressing plate 1, has corresponding V-shaped groove F on the die 3,
As seen a, b, c, d in conjunction with Fig. 2 scheme, and the implementation process of this method is as follows:
1, Fig. 2 a: stripper plate 1 and punch 4 are relative to be locked and moves downward, and v shaped ring enters blank fully, and a part of blank flows into the die V-shaped groove.
2, Fig. 2 b: stripper plate 1 and punch 2 continue descending, the blank waste part is extruded, and simultaneously, material is clamp-oned in the die cavity of die 3 in a large number, anti-top board 5 is forced to back off, wherein a part of material is gone into by backward extrusion in the shallow die cavity of stripper plate 1, and shallow depth of cavity is controlled to be the angle thickness that collapses of workpiece, in this process, waste material is under the Compound Extrusion effect, major part radially outwards flows, and a part enters V-shaped groove, and sub-fraction is radially to center flow.When outer blank by ironed to about thickness 2/3 the time (concrete size is determined according to material character and part thickness) pressing plate stop.
3, Fig. 2 c: stripper plate keep-ups pressure, invariant position, and punch is downward, and blank enters die under the forward extrusion effect.
4, Fig. 2 d: the mould die sinking, anti-top board 5 is released part, and the composite extruding fine-punching process finishes.