CN2140272Y

CN2140272Y - Rotating bull block

Info

Publication number: CN2140272Y
Application number: CN 92243020
Authority: CN
Inventors: 张秀凤; 邹春明; 崔宝华; 张恩
Original assignee: Tianjin No1 Initial Stress Factory
Current assignee: Tianjin No1 Initial Stress Factory
Priority date: 1992-11-30
Filing date: 1992-11-30
Publication date: 1993-08-18
Anticipated expiration: 2002-11-30

Abstract

The utility model belongs to the mould for producing heterotype steel wires. In the past, the class mould has always circular holes. The shape of a steel wire cross section drawn is also circular. For increasing the gripping force between the steel wire and the concrete, the steel wire is cold-processed into the nicking or screw-thread steel wire. Although the gripping force is improved, the steel wire does not still bear the oversize impact load. Therefore, the utility model designs a novel mould, and namely 3-6 convex ribs are uniformly arranged on the sizing band of a mould hole. The rib is parallel to the axis direction of the mould hole. The shape of a normal cross section of the utility model looks like a rectangle or a trapezium or a bow. When the utility model is used, a transmission mechanism which makes the utility model rotated is increased. The steel wire with a spiral torsion slot on a surface can be directly drawn conveniently.

Description

Rotating bull block

The utility model belongs to produces the profile wire mould.

Produce the wire-drawing die of prestressed concrete pipe pile in the past with steel wire, it is circular die always, the steel wire that institute's drawing goes out is round wire, and the bond stress between round wire and the concrete is very poor, therefore generally the as-cold reduced profile wire of round wire, indented wire for example, spiral, but using as-cold reduced profile wire, the pile tube of making still to hold can't stand bigger impact load, and make pile tube transverse fissure occur, promptly come off between reinforcing bar and the concrete.

The purpose of this utility model is relatively poor for overcoming between round wire or cold rolling profile wire and the concrete bond stress, causes pile tube easily to produce the shortcoming of transverse fissure, provides the direct drawing of a kind of energy to go out outer surface and has been carved with the mould that spiral is turned round groove.

The utility model is mainly realized by following structure.The 3-6 bar raised ribs parallel with the nib axis evenly arranged on the die channel calibrating strap, and the cross section of this muscle is that rectangle is trapezoidal or arc.The long L=1.5-3.5mm of its muscle, wide S=1,0-3,0mm, high H=0.2-0.6mm.

When above-mentioned raised ribs normal direction cross section was trapezoidal, wide S was 1.2-1.5 with the ratio S/S ' of last wide S ' under it; When arc, its radius R=0.5-5.2mm; For rectangle or when trapezoidal, radius of corner r=0.05-0.6mm on it.

Special-shaped wire-drawing die of the present utility model is applicable to that the drawn steel wire diameter is the steel wire of 6.0-14.0 millimeter.Be that wire drawing die nib calibrating strap diameter D is the 6.0-14.0 millimeter, nib sizing belt length is the 3.0-9.0 millimeter, and the outlet tapering is long to be the 2.0-6.0 millimeter.

Below in conjunction with description of drawings: Fig. 1 is the axial cutaway view of nib.Fig. 2 is Figure 1A A cutaway view.Fig. 3 is a wire drawing die nib calibrating strap expanded view.Fig. 4,5,6 is three kinds of difform Fig. 3 BB cutaway views.D represents wire drawing die nib calibrating strap diameter in the accompanying drawings, and L represents that raised ribs is long along the nib axis direction, and S represents the transversal face width of raised ribs normal direction (or wide down), wide in S ' expression, H represents the raised ribs height, radius when R represents that raised ribs normal direction cross section is arc, r represents radius of corner, L ₁Expression nib sizing belt length, L ₂Expression mould outlet tapering is long.Each parameter range is shown in subordinate list 1.

Be the axial cutaway view of nib with wire drawing die of 3 protruding muscle as shown in Figure 1, wherein protruding muscle is positioned on the wire-drawing die hole inwall, and parallel with the nib axis, and its length is less than the general value of sizing belt length between the 1.5-3.5 millimeter. Its normal direction cross section can be made into rectangle, trapezoidal and arc. Shown in Fig. 4,5,6. In addition, the height of convex tendon and width be along with the increase of wire drawing die is that the increase of nib calibrating strap diameter can be increased and widened, and so more is conducive to improve steel wire that drawing goes out and the bond stress between the concrete. Along with the increase of horizontal tool, the number of its protruding muscle also can improve, and namely gets higher limit equally. Normal direction cross section such as the above-mentioned rectangle, trapezoidal and arc that can be made into that protruding muscle is arranged again, this mainly is the characteristic according to concrete steel grade, decides such as the requirement of drawing complexity and profile wire. No matter be rectangle or trapezoidal all with fillet, it or not theoretical rectangle and trapezoidal. Bow-shaped cross-section is namely semicircle or less than semicircular cross section.

Enumerate embodiment below.

When selecting wire-drawing die calibrating strap diameter D=9.0mm for use, 4 raised ribs are evenly arranged on the nib calibrating strap, this muscle length is got the 1.5-2.0 millimeter, and it is the 1.0-1.5 millimeter that the normal direction cross section is taken as the rectangle muscle wide, and the muscle height is the 0.2-0.3 millimeter.6.0 millimeters of nib sizing belt lengths, long 4.0 millimeters of outlet tapering.

Its material of wire drawing die of the utility model design is a carbide alloy.The processing method of its nib has two kinds, the one, adopt the circular mode thermo forming, the 2nd, with special-purpose mold with cemented carbide powder compression moulding.When this kind mould has when use or drawn steel wire, need it to be rotated according to certain rotating speed, thereby directly drawing goes out the profile wire that appearance is carved with the screw twisted groove by means of a special-purpose transmission mechanism.

The wire drawing die of the utility model design is because its special nib structure and Hubbing method, can directly produce outer surface and be carved with the spiral fluted steel wire, this kind steel wire greatly improved and concrete between bond stress, satisfied prestressed concrete pipe pile with the demand of steel wire.

Claims

1, a kind of rotary-type wire drawing die is characterized in that the 3-6 bar raised ribs parallel with the nib axis evenly arranged on the wire drawing die nib calibrating strap; This muscle normal direction cross section is that rectangle is trapezoidal or arc.

2, wire drawing die according to claim 1 is characterized in that the long L=1.5-3.5mm of muscle, wide S=1.0-3.0mm, high H=0.2-0.6mm.

3, the wire drawing die according to claim 1 and 2 following wide S that it is characterized in that trapezoidal raised ribs is 1.2-2.5 with the ratio of last wide S '; The radius R of arcuate convex muscle is 0.5-5.7mm.

4, wire drawing die according to claim 1 and 2 is characterized in that die throat diameter D is the 6.0-14.0 millimeter, sizing belt length L ₁=3.0-9.0mm, outlet tapering L ₂=2.0-6.0mm.

5, wire drawing die according to claim 1 and 2 is characterized in that the radius of corner R=0.05-0.6mm on rectangle or the trapezoidal cross-section.