CN103866331A

CN103866331A - Superhard superplastic knife mold material and knife mold capable of punching and shearing metal thin sheets

Info

Publication number: CN103866331A
Application number: CN201210531518.9A
Authority: CN
Inventors: 余德望
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-12-11
Filing date: 2012-12-11
Publication date: 2014-06-18

Abstract

A knife mold material is prepared by strip steel; the strip steel has the thickness of 2-4 mm, the width of 32-40 mm and the length of 100 m or less, and is supplied in a looping mode. One side or two sides of the width are ground into knife edges (as shown in the accompanying figure) and are subjected to heat treatment; the hardness of best knife edges in markets is 48-52 HRC, and the plasticity is evaluated by a way that with a steel bar having the diameter of 10 mm as a circle center, the knife mold material is bent into 70 DEG, 90 DEG and 110 DEG without cracking. The knife mold material has the knife edge hardness reaching 58-62 HRC, and the plasticity is evaluated by a way that with the bending circle center diameter of less than 10 mm, the knife mold material is bent into 180 DEG without cracking. The hardness of 58-62 HRC is just the standard hardness for cold-punching of iron sheets, copper sheets, aluminum sheets and stainless steel thin sheets, so the superhard superplastic knife mold can replace a cold-punching mold for punching and shearing metal thin sheets; and obviously, the knife edges with high hardness are used for punching and shearing soft leather and plastics, the punching shearing stress is small, and thus the service life is longer.

Description

The superhard super cutting die of moulding cutting die material and energy punching sheet metal thereof

Technical field

Cutting die material is with being with steel to make, and conventional specification (thickness × width) is 2 × 32,2.5 × 32,2.5 × 36,2.5 × 40,3 × 32,3 × 36,3 × 40,4 × 32mm, length in 100 meters, lopping supply.One side or the both sides of width grind the edge of a knife, and through quenching, tempering makes edge of a knife hardness high, and overall plasticity is good.While making cutting die, with curved mould machine, the shape of the various article of the leather shoe surface of cutting die material bending one-tenth design, leather sole, clothes neck, clothes sleeve, plastics bag etc. is not split at normal temperatures; again head and the tail two ends are welded, just formed the blanking knife mould of processing leather shoe surface, leather sole and various fabrics etc.

At present in the world top-quality cutting die material by the Sandvik (Sandvik) of Sweden and the production of Austrian VEW company, their edge of a knife hardness is 48-52HRC, the rod iron that plasticity is 10mm with diameter is that the center of circle becomes 70 degree cutting die material bending, and 90 degree 110 are spent and do not ftractureed.Only I in the time of the cutting die material of producing, the edge of a knife is through the special process of carburizing, quenching, low-temperaturetempering, therefore, our edge of a knife hardness is 58-62HRC, plasticity press the diameters that two times of cutting die material thickness size are bending center of circle rod iron, bending 180 spend and do not ftracture.Visible, our edge of a knife hardness exceeds current highest level in the world 10HRC, and the bending center of circle of plasticity is 4,5,6,8mm, and the 10mm of more current world best level is much smaller, and bends to 180 degree and also do not ftracture.The more current world of our plasticity index best level is much better as can be seen here.So our cutting die material is called the superhard super cutting die material of moulding.Make the materials such as punching leather shoe surface, leather sole, clothes neck during if be used for, because its plasticity is good, bending force is little, and almost the shape of any complexity can not be split.When punching because its edge of a knife hardness is high, therefore punching shear is little, long service life.The more important thing is due to the cutting die product that adopts our special process to produce, because its hardness is high, not only can the above-mentioned flexible material of punching, more can punching stainless steel thin slice, the material such as iron sheet, copper sheet, aluminium skin, be the unique cutting die that can punching sheet metal in the world today.

Technical background

Before 1986, China cannot produce cutting die material.The materials such as punching leather shoe surface, leather sole can only be used cold-punching mould punching.Make cold-punching mould and will make die, punch.Use steel are many, complex manufacturing technology, and man-hour is long, and cost is high.Leather shoes price.1982～nineteen eighty-three, State Scientific and Technological Commission proposed to capture cutting die material scientific research task in Beijing.I in the metallic substance thermal treatment of teaching of Shanghai Metallurgical Industry higher junior college, have accepted this scientific research task in nineteen eighty-three.Completed after this problem, because school can not produce, therefore I am temporarily transferred and go by Xiangshan County of Zhejiang Province, have founded Ningbo extraordinary cutting die factory in local Jue Xi town.In 1986, start to have produced first cutting die material of China, soon, the leather shoes output of China becomes the whole world the first, certainly, Ye Shi big export country.

Summary of the invention

The soft steel of cutting die material selection carbon content 0.18% left and right.High-frequency induction heating to 1 for the edge of a knife, under 100 DEG C～1, the 200 DEG C endothermic atmosphere that is 1: 7.2 at propane and air ratio, carburizing 2 minutes, gives and is chilled to 900 DEG C, and after direct quenching, again with 200 DEG C of tempering, edge of a knife hardness is 58～62HRC.This hardness is also the standard hardness of cold-punching mould punching sheet metal.Therefore superhardly super mould cutting die and can replace cold-punching mould punching sheet metal completely.Use that plasticity is good if make the cutting die of general punching leather, plastics, can bend to any complicated shape and not ftracture.Edge of a knife hardness height is the little and long service life of punching shear.

Brief description of the drawings

Fig. 1 is the blank sectional view after cold rolling by hot rolling with steel.

Fig. 2 is Fig. 1 blank grinds point of a knife sectional view by special purpose grinder.

Manufacture the cutting die material of all size, selecting the band steel of respective width and thickness is raw material, makes as the blank of Fig. 1 shape, then grind point of a knife with special purpose grinder by hot rolling is cold rolling.As Fig. 2

Embodiment

Grind the blank of the lopping cutting die material of the edge of a knife, with seven roller straightener alignments, then being pushed the cementing furnace of sealing through two friction wheels, is propane and air in stove, its ratio is 1: 7.2, furnace pressure is 20～60mm water column, with the high-frequency induction heating edge of a knife to 1,100 DEG C～1,200 DEG C, in stove, edge of a knife carburizing 2 minutes, the edge of a knife infiltrates carbon 0.3～0.4mm.Stove has again two friction wheels to haul cutting die outward to come out of the stove, give and be chilled to 900 DEG C of hardening, then lopping, puts into the tempering stove tempering 1.5 hours of 200 DEG C, has just become vendible cutting die material.

Claims

1. the starting material that the low charcoal steel of selecting 0.18% left and right is cutting die material, ratio-frequency heating to 1100 DEG C for the edge of a knife～1200 DEG C is oozed charcoal 2 minutes under propane and the AIR Proportional endothermic atmosphere of 1: 7.2, then give and being chilled to after 900 DEG C of direct quenchings, with 200 DEG C of tempering, making edge of a knife hardness is 58～62HRC again.This hardness is also the standard hardness of cold-punching mould punching sheet metal.Therefore superhardly super mould cutting die and can replace cold-punching mould punching sheet metal completely.Use that plasticity is good if make the cutting die of general punching leather, plastics, can bend to more complicated shape and not ftracture.Edge of a knife hardness height is the little long service life of punching shear.