CN100595000C

CN100595000C - Screw rolling machine for inner thread

Info

Publication number: CN100595000C
Application number: CN200710041828A
Authority: CN
Inventors: 储宏道; 储士强
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-06-11
Filing date: 2007-06-11
Publication date: 2010-03-24
Anticipated expiration: 2027-06-11
Also published as: CN101323006A

Abstract

A screw rolling device of an internal screw thread includes rollers the outer surfaces of which are provided with annular screw thread cogs; the quantities of the rollers are 2 to 5 pieces; the groupof rollers is uniformly arranged on the same circle of a roller seat; each roller consists of a cone and a cylinder; the middle part of the group of rollers is provided with a central annular gear axis meshed with each roller. The invention can lead each roller to obtain the coaxial locating for realizing screw rolling; besides, the invention also bears coaxial force and radical force when the roller group works and particularly leads the radical force of the roller with the largest load to be balanced and neutralized on the central annular gear axis, thus not only compacting the structure ofthe device, but also optimizing the stressed situation for the transmission of the device. The screw rolling device of the internal screw thread can be used for the screw rolling process for the internal screw thread of a crude steel rib connecting sleeve with an inner diameter which is larger than 16mm.

Description

Screw rolling machine for inner thread

Technical field

The present invention relates to a kind of machine tooling screw rolling machine for inner thread that is used for, relate in particular to the nut or the sleeve that is threaded are carried out the device that rolled thread is processed.

Background technology

The screw thread rolled thread is a kind of no Machining Technology for Cutting, is widely used in the manufacturing of external screw thread product, belongs to blank and use internal thread production substantially in China.This is because be subjected to the restriction in space (aperture): the roll that is used for machining internal thread, be subjected to very big radial load and axial force man-hour adding, in order to keep enough rigidity, the material of breaker roll, diameter have harsh requirement, thereby are difficult to internal diameter is carried out rolled thread processing less than 29 millimeters internal thread.The inventor is in the disclosed internal thread rolled thread device of utility model patent (patent No. 01253090.5) of calendar year 2001 application, owing to be provided with the center bolt that is meshed with each roll at the middle part of roll, thereby in production practices, though center bolt can be meshed with each roll, but can not realize pure rolling in the transmission, often generation moves axially, and effectively rolling goes out internal thread.If stop moving axially of roll, also only take the mode machining internal thread of " extruding ", be equal to thread forming tap, and only can process internal diameter less than 12 millimeters the lower material of hardness such as non-ferrous metal, but can't carry out the rolling processing of internal thread greater than high-strength materials such as 14 millimeters medium carbon steel, steel alloys to internal diameter.

Summary of the invention

The present invention is in order to overcome above-mentioned major defect, to provide a kind of compact conformation durable, can be used for internal diameter is carried out the internal thread rolled thread device that internal thread carries out rolled thread processing greater than high-strength materials such as 14 millimeters medium carbon steel, steel alloys.

The present invention includes one group of outer surface and have the roll of ring screw teeth, this group roll is distributed on the same circumference of roller seat.The quantity of roll can be 2 to 5, and every roll is made of cone and cylinder two parts.

The cone of roll and cylinder two parts outer surface are equipped with the ring screw teeth, and the tooth pitch t of roll annular thread tooth equals the thread distance of workpiece to be machined.Middle part at this group n (n=2-5) root roll is provided with center annular tooth axle.Center annular tooth axle is provided with the teeth of its cross section for annular.Each roll is meshed with the dislocation of center annular tooth axle, makes the ring screw teeth dislocation t/n of adjacent rollers.The two ends of center annular tooth axle are installed on the roller seat by sliding bearing or rolling bearing, thus the position of fixed center annular tooth axle.

Because center annular tooth axle is meshed with each roll simultaneously, not only make the axial location of the accomplished screw thread rolled thread of each roll, but also axial force and radial load when having born roll stacks work simultaneously, especially make the maximum roll radial load of load on center annular tooth axle, obtain balance and dissolve, the both compact structure of device, optimized the transmission force-bearing situation of device again, thereby make this professional skill field think that the hope that may implement hardly is achieved, can be used for the internal thread rolled thread of internal diameter at present greater than 16 millimeters bar reinforcement branch sleeve.In addition, because squeezing thread has the long-term high accuracy that continues than screw cutting, and the rolling thread has the characteristics of metal compaction and sclerosis, thereby can significantly improve the performance of its tension, shearing resistance and antifatigue, this becomes possibility for using mild steel or the general high-intensity nut of medium carbon steel instead of alloy steel rolling high-quality or the sleeve that is threaded in large quantities.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is that the A-A of Fig. 1 is to cutaway view.

The specific embodiment

Preferably 3 of the quantity of roll 5 of the present invention.Every roll 5 is made of cone 51 and cylinder 52.The surface of the cone 51 of roll 5 has equidistant ring screw thread teeth, plays the guiding to workpiece, crowded tooth effect during work.There are the ring screw teeth identical with cone on cylinder 52 its surfaces of roll 5, play extruding, corrective action to the workpiece internal screw thread.Three rolls 5 are uniform to be installed on the same circumference of roller seat 1 and 2, and three rolls 5 are 120 degree and distribute, and respectively with the axially dislocation engagement of center annular tooth axle 3 that is located at roller seat 1 and 2 middle parts, the workpiece internal thread pitch of the annular tooth dislocation 1/3 of adjacent rollers.The two ends of center annular tooth axle 3 be fixed on the roller seat 1,2 by rolling bearing 6 and dottle pin 7.Turn screw 4, can adjust and eliminate the axial motion gap of center annular tooth axle 3.

Identical with the process of general machining internal thread, the present invention is installed on the main shaft of drilling machine or milling machine, the workpiece 8 of internal thread to be processed is fixed on the workbench of lathe, start machine tool chief axis, make the internal diameter rotation of roll 5 relative workpiece 8, and axial feed, promptly roll out straight thread in inner diameter of workpiece.When roll is done dextrorotation to rotating relative to workpiece, and axial feed, promptly rolling dextrorotation straight thread makes the roll counter-rotating then, and then roll withdraws from the workpiece internal thread that is engaged with automatically.Adjust roll 5 and the axial dislocation order that center annular tooth axle 3 meshes, just can shut out left hand thread.

Also can use the present invention and be core technology, manufacture and design high efficiency special-purpose internal thread wire rolling mill.

Claims

1, a kind of screw rolling machine for inner thread, comprise that n outer surface has the roll of ring screw teeth (5), it is characterized in that n roll (5) is distributed on roller seat (1,2) on the same circumference, every roll is made of cone (51) and cylinder (52) two parts, the middle part of this group roll is provided with the center annular tooth axle (3) that is meshed with each roll, described center annular tooth axle is provided with the teeth of its cross section for annular, a described n roll (5) is axially dislocation engagement with center annular tooth axle (3), the ring screw teeth dislocation t/n of adjacent rollers, wherein n is 2 to 5, and t is the tooth pitch of roll annular thread tooth.

2, internal thread rolled thread device according to claim 1 is characterized in that the two ends of center annular tooth axle (3) are fixedly mounted on the roller seat by rolling bearing or sliding bearing.