CN2225318Y

CN2225318Y - Thread rolling mill for steel bar end connection

Info

Publication number: CN2225318Y
Application number: CN 95243988
Authority: CN
Inventors: 常纯哲; 周国富; 周申光; 凌湘帆
Original assignee: SHANGHAI IRON AND STEEL PROCESS TECHNOLOGY INST
Current assignee: SHANGHAI IRON AND STEEL PROCESS TECHNOLOGY INST
Priority date: 1995-05-16
Filing date: 1995-05-16
Publication date: 1996-04-24
Anticipated expiration: 2005-05-16

Abstract

The utility model provides a thread rolling mill for steel bar end connection, which is formed by rolling. The utility model is characterized in that a thread rolling mechanism is arranged between the profile modeling cutting head of the original threading machine and a speed reducer of the original threading machine by connection; the rolling mechanism is composed of a rolling wheel holder and three rolling wire wheels supported by the rolling wheel holder and is also provided with an adjusting gear and an intermediate gear. The utility model is used for making the connection threads of steel bars, and can avoid cutting off the thread fibres of the steel bars; the tensile strength of a joint achieves or exceeds the tensile strength of the original steel bars.

Description

End reinforced connecting thread rolling mill

The utility model relates in the construction in order to process the machining equipment of end reinforced connecting thread.

Existing in order to process the equipment of end reinforced connecting thread, be the screw thread steel die head threading machine that adopts shaping by stock removal, generally formed by motor, decelerator, copying cutting head, guide pillar detent mechanism, workpiece clamping mechanism, feed mechanism.The end reinforced circular cone or the cylindrical thread that cut out with this equipment, its material fiber is cut off, the original cross-sectional area of cutting position reinforcing bar reduces, and causes the tensile strength of reinforcing bar jointing to be lower than connected reinforcing bar tensile strength, therefore uses to be subjected to certain limitation.

For overcoming above-mentioned defective, the utility model proposes a kind of end reinforced connecting thread rolling mill that adopts rollforming, to improve the tensile strength of reinforcing bar jointing.

Design philosophy of the present utility model is to be connected into the thread rolling mechanism that cylindrical die roll is housed between the copying cutting head of original die head threading machine and decelerator.

Good effect of the present utility model is: processed end reinforced elder generation carries out the reinforcing bar outer surface through the copying cutting head and is cut to needed cylinder or cone, then send thread rolling mechanism to, by cylindrical die roll its cold conditions is rolled into needed screw thread form, the material fiber of having avoided cutted thread and having caused be cut off consequence, in rolling cold working process, can make simultaneously the thread surface sclerosis, thread surface is highly polished, thereby improved the tensile strength of screw thread, also improved the fatigue resistance of joint certainly.Through measuring, the screw thread steel bonding strength that the utility model processes obviously improves, its tensile strength can reach more than 1.05 times of former tensile strength of reinforcement, and the index of tensile and compressive property repeatedly in elasticity and plastic range has reached A grade standard in the mechanical connection technique of reinforcement rules.

Be described in further detail below in conjunction with most preferred embodiment of the present utility model and accompanying drawing thereof.

Fig. 1 is the general structure schematic perspective view of present embodiment.

Fig. 2 is the internal structure schematic diagram of rolling mechanism among Fig. 1.

Fig. 3 is that A among Fig. 2-A place saves the profile of roller mount.

As Fig. 1,2, most preferred embodiment shown in 3, end reinforced connecting thread rolling mill, by support 7, be contained in the motor 1 on the same main shaft, decelerator 2, copying cutting 5 organisation of working of forming, guide pillar detent mechanism 9, workpiece clamping mechanism 8 and feed mechanism 10 are formed, motor 1, decelerator 2 and copying cutting 5 is linked to be an integral body and is the shape that is slidingly matched and be contained on two guide pillars parallel with above-mentioned main shaft 6, its new design feature is to have added the thread rolling mechanism 3 that cylindrical die roll 32 is housed between copying cutting 5 and the decelerator 2, the central axis of rolling mechanism 3 is positioned on the above-mentioned main shaft, and with decelerator 2, copying cutting 5 fuses.

Above screw thread rolled thread mechanism preferred design becomes three cores, and three cylindrical die rolls 32 are promptly arranged, and they are installed in the roller mount 31 of cylindrical shell shape, and by roller mount 31 supportings.Three cylindrical die rolls 32 connect 120 degree central angles and distribute, and are axially differing 1/3rd pitch each other, and the cylindrical die roll axis is parallel with main shaft and equate with the distance of main shaft.For guarantee three between the cylindrical die roll 32 pitch difference and make their synchronous rotations, each cylindrical die roll is furnished with one and adjusts 33, three of gears and adjust gear 33 and be meshing with each other by an idler gear 34.

The course of work of the present utility model is: an end of reinforcing bar passes the workpiece clamping mechanism 8 clamped station positions that are in.Starter motor 1, whole organisation of working, the motor 1 that promptly fuses, decelerator 2, rolling mechanism 3 and copying cutting 5 is driven to rotate.With feed mechanism 10 whole organisation of working is shifted to end reinforced and with guide pillar detent mechanism 9 location, carried out surface cut by the copying cutting head earlier along guide pillar 6.

When end reinforced after the copying cutting head is machined to required degree, withdrawing, operate feed mechanism 10 again, push to rolling mechanism end reinforced, three cylindrical die rolls 32 are made circular motion around reinforcing bar on the one hand under the drive of roller mount 31, be subjected to axial compressive force simultaneously and be pressed in end reinforced surface separately and do rotation and roll, carry out the thread-rolling operation, as shown in Figure 3.After treating that screw thread is rolling and finishing, stop motor, and counter-rotating, entire processing apparatus can withdraw from.

In use, can change various different taperings, tooth shapes, the cylindrical die roll 32 of different pitch according to the requirement of construction.Its tapering is generally 0 to 8 degree, and tapering is 0 when spending, and is cylindrical thread; Thread form can adopt any in triangle, trapezoidal, zigzag or the circle; Pitch is generally got 1 to 5 millimeter.

For guaranteeing that being cut the iron filings that get off in the process can successfully discharge, between copying cutting 5 and rolling mechanism 3, can leave iron filings discharge ring 4.

Claims

1. end reinforced connecting thread rolling mill, by support, be contained in the organisation of working that motor, decelerator, copying cutting head on the same main shaft are formed, the guide pillar detent mechanism, workpiece clamping mechanism and feed mechanism are formed, motor, decelerator and copying cutting head are linked to be an integral body and are the shape that is slidingly matched and be contained on two guide pillars parallel with above-mentioned main shaft, it is characterized in that being connected into the thread rolling mechanism that cylindrical die roll is housed between copying cutting head and the decelerator, its central axis is positioned on the above-mentioned main shaft.

2. end reinforced connecting thread rolling mill according to claim 1, it is characterized in that described thread rolling mechanism is by the roller mount of cylindrical shell shape and is installed in the roller mount and is made of three cylindrical die rolls of roller mount supporting, three cylindrical die rolls distribute by 120 degree central angles, axially differing 1/3rd pitch each other, the cylindrical die roll axis is parallel with main shaft and equate with the distance of main shaft, each cylindrical die roll is furnished with one and adjusts gear, adjusts gear for three and is meshing with each other by an idler gear.

3. end reinforced connecting thread rolling mill according to claim 1 and 2, the thread taper span that it is characterized in that described cylindrical die roll is 0 to 8 degree, the thread form of screw thread is a kind of in triangle, trapezoidal, zigzag or the circle, and the pitch span of screw thread is 1 to 5 millimeter.

4. end reinforced connecting thread rolling mill according to claim 1 is characterized in that being provided with the iron filings discharge ring between copying cutting head and the thread rolling mechanism.