The steel band stitch scissors cutting edge of PVD coating
Technical field
The present invention relates to a kind of steel band stitch scissors cutting edge of the PVD of being coated with coating, the shear forming processing of stitching for the connection of front and back two coil bands in all kinds of sheet band steel strip rollings or surface treatment continuous-output machine group.
Background technology
In sheet band steel strip rolling or surface treatment continuous-output machine group, for realizing the continuity of producing, need between uncoiler and looper, install a steel band robotic suturing device, to the afterbody of the head of a rear coil band and last coil band is sewed up and linked together.Like this, front and back two coil bands connect in aggregates, have just reached and have allowed last coil band bring a rear coil band into production equipment to carry out quantity-produced object.
Some (50 of one-sided maximum needs) shear-blades are respectively installed in the bolster of steel band robotic suturing device.In the time of need to sewing up, steel band is penetrated between the bolster of robotic suturing device and location, then by forcing press, make the bolster matched moulds of robotic suturing device, be arranged on shear-blade in bolster and shear steel band and form and connect seam.At the point of attachment that needs of last coil tail and a rear coil band head, shear out connection seam respectively, then the connection seam of two coil bands is mutually inserted on request, stretched, two coil bands are by an integral body of the mutual stranded connection formation of connection seam separately.
At present, the shear-blade on robotic suturing device adopts steel alloy manufacture then by quenching, nitriding or carburizing, to carry out case hardness strengthening, or directly adopts Hardmetal materials manufacture.
Adopt steel alloy manufacture and through the shear-blade of surface hardening, nitriding or carburizing, case hardness is HRC64~68, general shear number of times is 500 to 1200 times, and is difficult to shear tensile strength and surpasses 130Kg/mm
2high strength silicon steel.
The hardness of carbide alloy is HRC75~80, the shear-blade that adopts Hardmetal materials to manufacture, due to the high but poor toughness of hardness, easy tipping, and material cost is high, manufacturing process is complicated, be difficult for reparation reuses, so in overall use cost, there is no advantage although increase service life.
The above-mentioned shortcoming that existing stitch scissors cutting edge is manufactured and used, not only affects production efficiency and production cost, and has limited the application of robotic suturing device, and at present, there is the trend of using welding equipment to substitute robotic suturing device in steel mill.
Summary of the invention
The object of the present invention is to provide a kind of steel band stitch scissors cutting edge with single or multiple lift PVD coating, the shear forming processing of stitching for the connection of front and back two coil bands in all kinds of sheet band steel strip rollings or surface treatment continuous-output machine group, it comprises matrix and PVD coating, matrix adopting steel are manufactured, and surface applies anti abrasive PVD coating.
The PVD coating of mentioning in the present invention refers to a kind of coating obtaining by physical vapour deposition (PVD) (Physical Vapor Deposition) method, as evaporation plating, ion plating, the processes such as sputter plating.
The PVD coating of mentioning in the present invention can be individual layer homogeneous coating or comprise the coating that multilayer has different-thickness and different components, this PVD coating can be nitride, oxide or carbide or its any mixture of one or more elements in titanium (Ti), zirconium (Zr), chromium (Cr), tungsten (W), boron (B), aluminium (Al) and silicon (Si), for example, TiN, TiCN, TiAlN, AlTiN, WC/C, Si02, B4C, BN, AlCrN, Zr02, etc., according to the performance of the tool strip body that needs to shear, carry out coating selection and coating combination.
The gross thickness of the PVD coating of this shear-blade is generally 0.5 to 20 micron, and optimum thickness, between 2 to 10 microns, carries out coating layer thickness selection according to the performance of the tool strip body that needs to shear.
Steel band stitch scissors cutting edge constructed in accordance has the advantages that overall flexibility is good, case hardness is high, wear-resistant, is difficult for tipping, is easy to repair reuse.So steel band stitch scissors cutting edge long service life constructed in accordance, and can shear high strength silicon steel.
Steel band stitch scissors cutting edge constructed in accordance, owing to adopting steel (as steel alloy, high-speed steel, mould steel etc.) processing and manufacturing shear-blade matrix, not only the cost of material is low, and process easily realizes.
Accompanying drawing explanation
Accompanying drawing is schematic diagram of the present invention, illustrates a kind of steel band stitch scissors cutting edge of the PVD of being coated with coating, and in figure, dash area is anti abrasive PVD coating, and top and surrounding side are working face and shear blade.
The specific embodiment
The machining of shear-blade: according to the selected steel of drawing requirement, complete roughing through techniques such as line cutting, spark discharge, grindings.
The working face of shear-blade and shear blade are carried out to polishing, remove burr, its surface roughness is reached below Ra1.0.
Optional technique: the shear-blade after polishing is carried out to nitriding (must not use salt bath nitriding), and depth of nitration preferably reaches more than 0.5 millimeter.After nitriding operation completes, then the working face of shear-blade and shear blade are carried out to polishing, remove surface oxidation nitride layer, white layer, and its surface roughness is reached below Ra1.0.
With the shear-blade after alkaline cleaner cleaning polishing, then with clear water rinsing, totally dry again.
Ready shear-blade is installed in PVD coating apparatus; select coating kind; then through vacuumizing, heating, electronics deep layer cleaning, PVD coating, the processing step such as cooling complete coating, the rotation dimension that the thickness of coating should be by being installed, cover the methods such as protection, the setting of coating time and control.
If need the combination of multilayer different coating, for example TiN+AlCrN, can first complete TiN coating by abovementioned steps, then repeats aforementioned the last two steps processing step coating AlCrN coating.
Shear-blade after coating is carried out to post processing, with scouring pad, by coating position polishing 3 to 5 times, remove rat coating granule, so that smooth surface, reduction shearing friction.
On completing the shear-blade of coating, smear antirust oil so that the protection in storage and transport process.