CN1040523A

CN1040523A - The mould and the technology of blossom type cold-drawn band steel

Info

Publication number: CN1040523A
Application number: CN 89104747
Authority: CN
Inventors: 苏志英
Original assignee: ANLITUN COLD-DRAWN STEEL FACTORY WENAN COUNTY HEBEI PROV
Current assignee: ANLITUN COLD-DRAWN STEEL FACTORY WENAN COUNTY HEBEI PROV
Priority date: 1989-07-25
Filing date: 1989-07-25
Publication date: 1990-03-21
Also published as: CN1013741B

Abstract

The present invention relates to a kind of steel cold drawing die and use this mould the technology of round steel drawing as band steel.This mould is the carbide alloy cold drawing mold with setting work cone angle and work conical surface, it is characterized in that its deformed area is flat blossom type.Five work cone angles and 20 work conical surfaces are arranged, three different oval work conical surfaces with 12 of different oval work cone angles are wherein arranged, use this mould a drawing of high quality round bar can be the finished product band steel.Reduction of cross sectional area reaches as high as 48.4% pair of band steel that the ratio of width to height number is big, can earlier through the cold shaping of the cold-rolling mill of special use once also can use the cold drawing mold shaping once to the band steel that the ratio of width to height number is little.And then be the finished product band steel through a drawing of blossom type cold drawing mold.Use mould of the present invention and technology can improve pass deformation rate, reduce drawing passes, solve sticking to mould, collapse problem such as mould, reduce production costs, improve draw efficient.

Description

The mould and the technology of blossom type cold-drawn band steel

The present invention relates to a kind of steel cold drawing mold and cold-drawing process, the carbide alloy cold drawing mold that particularly has the setting work conical surface and work cone angle, its deformed area is blossom type, five work cone angles and 20 work conical surfaces are arranged, and being used for a drawing of round steel is the finished product band steel, can improve pass deformation rate, reduce drawing passes, solve sticking to mould, collapse problem such as mould, reduce production costs, improve draw efficient.

At present, used cold-drawn band steel mould in the domestic and international metal drawing machine, be taper cold-drawn mould, when adopting round steel to make blank draw band steel, blank is out of shape in mould by four work conical surfaces and importing of a work cone angle and compression, so just limited the increase of deflection, thereby need repeatedly change the mould of difformity and dimensions, carry out the multi-pass draw progressively drawing be finished product.For the bigger cold drawn band steel traditional handicraft of the ratio of width to height number is to roll into the size bigger than cold drawn band steel with hot-rolling mill earlier, and then through conical die drawing finished product.If with above two kinds of explained hereafter, cost is too high, production efficiency is too low.

The objective of the invention is shortcoming at above-mentioned band steel cold drawing die, make improvements, be developed into blossom type cold-drawn band steel mould, thereby raising pass deformation, reduce drawing passes, improved drawing process, the sticking to mould that is easy to generate when solving the aximal deformation value drawing simultaneously, collapse problem such as mould, can reduce production costs, improve draw efficient.

The present invention has increased the work conical surface and work cone angle on the basis of existing taper cold-drawn mould, form 20 work conical surfaces and five work cone angles at the die entrance end, and its 20 conical surfaces constitute blossom type, are called the blossom type cold drawing die.

Introduce the structure and the principle of blossom type cold-drawn band steel mould in detail below in conjunction with accompanying drawing.

Fig. 1 is the front view of blossom type cold-drawn band steel mould;

Fig. 2 is the cutaway view of blossom type cold-drawn band steel mould;

Fig. 3 is the B partial sectional view of blossom type cold-drawn band steel mould;

Fig. 4 is the front view of shaping mould;

Fig. 5 is the cutaway view of shaping mould;

Fig. 6 is the B partial sectional view of shaping mould;

Fig. 7 is the pass of cold-rolling mill.

α 1 is the facial work of the plum blossom lobe cone angle of mould among Fig. 2, its value is 17～22 degree, α 2 is that the first plum blossom lobe elliptical section is divided the work cone angle, its value is 10～12 degree, and α 3 is that the second plum blossom lobe elliptical section is divided the work cone angle, and its value is 9～11 degree, α 4 is the work cone angle of the oval part of the 3rd plum blossom lobe, its value is 9～10 degree, and die entrance cone angle 6, its value are 17～20 degree.α 5 is a plum blossom lobe root work cone angle among Fig. 2, and its value is 7～10 degree.

When the circle cross section blank enters the work zone of blossom type cold-drawn mould, at first form the 20 face cone bodies that constitute by 20 work conical surfaces, form four bights subsequently gradually and fill crowded good four sides rectangular cone, promptly entering the setting band then, through the expansion typing, form the finished product band steel.In this mould five work cone angle with increased cooperating of 20 work conical surfaces by the deflection of circle cross section to the band steel rectangular cross section, and changed the molding condition of metal in mould, section compression and length extensional are carried out simultaneously, meet the cold-drawn band steel of standard-required with formation.

Experimental result shows, reached 48% for the highest pass deformation rate of round steel in quincunx cold-drawn mould of A3 and 45# steel.Use the pass deformation rate that conical die allowed to improve 2 than general.1～3。8 times, become the band steel finished product of same size with identical high quality round bar blank draw, drawing passes reduces to once lumber-preserving by 4～10 roads, and the band steel end product quality of once lumber-preserving meets the technical standard requirement of GB906～82.Since lubricating when the different approach cone corner structures of each conical surface help deformation of steel, the easy problem that the bight sticking to mould takes place when having solved draw.Simultaneously because the pyramidal structure of five cone angles, 20 conical surfaces has changed the stress of mould, avoided because of the draw deformation rate increase produce collapse the mould phenomenon.

For requiring the bigger band steel of the ratio of width to height number, for finished product band steel surface quality and every mechanical performance index are further improved, in the process of using blossom type cold-drawn mould draw band steel, it is rolling often to need to increase by one cold rolling shaping, uses custom-designed cold rolling shaping roller and drawing sizing die to carry out drawing.The structure of this shaping mould such as Fig. 4, shown in Figure 5, be with four parts to form by inlet cone angle, work zone, setting band, outlet, the work conical surface is four curved working faces, all become double tapered angle blossom type shaping cold-drawn mould, the work cone angle that wherein enters the mouth 9 is 15～20 degree, and oval work cone angle 7 is 10～12 degree, bight cone angle 8 is 8 degree, inlet cone angle 10 is 20～27 degree, and the concrete condition during also by use is decided, and setting band section is illustrated chimb rectangle.

Shaping mould and blossom type cold drawing die are used the finished product band steel of drawing, and its surface quality and mechanical performance are better, in strict conformity with the technical standard requirement of the world.It is that blank is produced in the drawbench of all size band steel that the present invention can be used for the round steel.

The present invention compares with existing taper cold drawing mold, can improve 2～5 times of draw efficient, reduces production costs 2～3 times, improves passage maximum distortion rate 2. 1～32 times, and the Interventions Requested such as surface quality, mechanical performance all meet GB906～82, the relevant art requirement of GB3078～82.

One embodiment of the present of invention below:

The 45# high-quality carbon structure hot rolled circular steel of φ 28mm is once cold rolling, be configured as again annealing behind the ellipse, pickling, lubricated, becoming opposite side distance through the quincunx finished product mould of five cone angles, 20 conical surfaces draw then is the finished product band steel of 10 * 30mm. Finished product band steel through this technology draw is compared with the identical material of existing technology utilization taper cold-drawn mould draw, the finished product band steel of specification, and its pass deformation rate improves 3. 1 times, the draw passage reduces 8 times, and production cost reduces by 4 times.

Claims

1, a kind of steel cold drawing mold particularly has setting work cone angle and the carbide alloy cold drawing mold of the conical surface of working.It is characterized in that this cold drawing mold deformed area is flat blossom type, 20 work conical surfaces of five work cone angles are arranged, wherein have 12 different oval work conical surfaces of three different oval work cone angles to be used for the drawing band steel.

2, cold drawing mold according to claim 1, it is characterized in that said five work cone angles are respectively: the facial work of plum blossom lobe cone angle 1, its value are 17～22 degree; Plum blossom lobe root work cone angle 5, its value are 7～10 degree; The work cone angle of three different ellipsoid parts of plum blossom lobe is respectively α 2, and its value is 10～12 degree; α 3 its values are 9～11 degree; α 4 its values are 9～10 degree, and die entrance cone angle 6, its value are 17～20 degree.

3, a kind of steel cold-drawing process, it is characterized in that using the blossom type cold drawing mold, can be the finished product band steel with a drawing of high quality round bar, the band steel big to the ratio of width to height, then need earlier once through the oval pass shaping of cold-rolling mill, the band steel little to the ratio of width to height number can be with the drawing of shaping cold drawing mold once.And then be the finished product band steel through a drawing of blossom type cold drawing mold.

4, technology according to claim 3 is characterized in that described shaping cold drawing mold has two work cone angles, and oval work cone angle 7, its value are 10～12 degree; Inlet work cone angle 9, its value are 15～20 degree; Bight cone angle 8, its value are 8 degree, the ellipse angle α 10 that enters the mouth, and its value is 20～27 degree, typing band section is the chimb rectangle.