CN2396916Y

CN2396916Y - Spiral fluted pressure tap

Info

Publication number: CN2396916Y
Application number: CN 99250414
Authority: CN
Inventors: 齐长海; 杨景芳
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-11-23
Filing date: 1999-11-23
Publication date: 2000-09-20
Anticipated expiration: 2009-11-23

Abstract

The utility model relates to a spiral fluted extruding tap, which is composed of cut guiding teeth, cut correcting teeth, an extruding guiding tooth part, extruding correcting teeth, an empty cutter slot and a tap handle. The utility model is characterized in that a cut part is in a spiral fluted shape, an extruding part is in a spiral edge shape and cut and extruding spiral angles are same. The tooth ratio of the cross sections of the cut part and the extruding part is 1: 2. The distance between the extruding edge lines on the little back part of a cut oblique edge is 0 to 2.5 millimeters. The half angles of cut and the extruding guiding tap are same and the back shoveling quantities of the cut teeth and the extruding teeth are same. The cutter adopts half cut, half extrusion and small working torque. The precision of a processed inner thread is high.

Description

Helicla flute rib thread forming tap

The cutter of using when the utility model is a kind of machining.

At present, processing sucker rod box cupling the time, half thread forming tap of use, because of this screw tap difficulty of processing big, the quality instability, the workpiece that processes is jagged, the anti-strength of its taps direct back angle, moment of torsion is big, chip removal is not smooth during cutting, Yi Dachi, and two button that processes screw thread are corrugated; Along with the wearing and tearing of cutting teeth portion, the amount of compression of extruding tooth portion increases, and oil scupper produces cutting stream sometimes, and screw tap is easily twisted into two parts.

The purpose of this utility model is to propose a kind of helicla flute rib to push the silk vertebra, and its cutting teeth portion and extruding tooth portion are spirality, but the tapping one-shot forming, moment of torsion is little during work, and chip removal is unobstructed, and extruding is steady, the internal thread precision height that processes, cutter life is long.

The utility model is proofreaied and correct by cutting guide gear 1, cutting that tooth 2, undercut 3, extruding guide gear 4, extruding are proofreaied and correct tooth 5, tap holder 6 is formed, as shown in Figure 1; Wherein cut guide gear 1, cutting correction tooth 2 formation cutting portions, extruding guide gear 4, extruding are proofreaied and correct tooth 5 and are constituted press section, it between cutting portion and the press section undercut 3, the back of press section connects with tap holder 6, it is characterized in that: cutting portion is grooved in the shape of a spiral, press section is the rib type in the shape of a spiral, the cutting portion pitch angle gamma ₁With the press section pitch angle gamma ₂Identical, γ ₁=γ ₂Be the 2-8 degree, the cutting portion cross section number of teeth and press section cross section gear ratio are 1: 2, and the distance of cutting between the back partially extruding crest line of oblique sword is 0-2,5 millimeters, and cutting guide cone half-angle α ₁With extruding guide cone half-angle α ₂Identical, α ₁=α ₂Be the 3-8 degree, the back-off amount K of cutting teeth ₁, with extruding tooth back-off amount K ₂Identical, K ₁=K ₂Be the 0.7-1.5 millimeter, the oil scupper angle theta=45-60 degree of tooth cross section is proofreaied and correct in extruding.

The utility model is formed helicla flute rib thread forming tap by cutting portion, press section and handle, as shown in Figure 1; Wherein cutting portion comprises that cutting guide gear 1, cutting proofread and correct tooth 2, and press section comprises that extruding guide gear 4, extruding proofread and correct tooth 5, is that undercut 3 connects between cutting portion and the press section; Extruding is proofreaied and correct the tooth back and is connected with handle 6.Cutting portion and press section all are screw types, the pitch angle gamma of cutting portion ₁Pitch angle gamma with press section ₂, and γ ₁=γ ₂=2-8 degree, the cutting guide cone half-angle α of cutting portion ₁Extruding guide cone half-angle α with press section ₂Identical, α ₁=α ₂=3-8 degree, as shown in Figure 1; The cross section number of teeth of cutting portion and press section cross section gear ratio are 1: 2, shown in Fig. 2,3; The back-off amount K of cutting portion ₁With extruding tooth back-off amount K ₂Identical, K ₁=K ₂=0.7-1.5 millimeter is shown in Fig. 2,3; And the oil scupper angle theta=45-60 degree of tooth cross section is proofreaied and correct in extruding, as shown in Figure 3.Cut between oblique sword and the extruding crest line it and cut oblique sword and push crest line and can be the 0-2.5 millimeter in the back partially, and after must be partially.When processing during rod collar, its pitch is 2.54 millimeters, and the form of thread angle is 60 when spending, available this screw tap, and with its cutting guide gear 1 cutting, cutting is proofreaied and correct tooth 2 and is proofreaied and correct earlier; Proofread and correct then through extruding guide gear 4 thread-rolling screws, and with extruding correction tooth 5, can process high-precision internal thread.

The utility model has following advantage compared with prior art: this cutter is that a kind of hemisection is cut, the screw tool of half extruding, is exclusively used in the processing of the screw thread of rod collar internal thread.Because cutting teeth is identical with the helical angle of extruding tooth, its number of teeth is 1: 2 a relation, and the form of thread relief grinding is convenient, and to cut oblique sword be a helix with the extruding crest line, cutting extruding steadily, along with extruding going deep into partly, circumference split extruding point increases, and pushes more steady.Helical angle is identical, and axial advance speed is identical, and the chip removal smoothness is cooled off.The oil scupper angle theta of helicla flute rib thread forming tap is the 45-60 degree, from the oil scupper flute profile, be outer big, the lining is little; The flank of tooth forms negative rake, and tooth intensity is big, Integrated Chip not, and workpiece fineness is good, and cutter life is long.

Description of drawings:

Fig. 1 is a general structure schematic diagram of the present utility model;

Fig. 2 is the A-A profile of the utility model Fig. 1;

Fig. 3 is the B-B profile of the utility model Fig. 1.

Embodiment of the present utility model:

The utility model is proofreaied and correct by cutting guide gear 1, cutting that tooth 2, undercut 3, extruding guide gear 4, extruding are proofreaied and correct tooth 5, tap holder 6 is formed, as shown in Figure 1; Wherein cut guide gear 1 and cutting and proofread and correct tooth 2 formation cutting portions; Extruding guide gear 4, extruding are proofreaied and correct tooth 5 and are constituted press section.Cutting teeth, extruding tooth adopt high-speed steel, and tap holder is with No. 45 steel, with high speed steel and No. 45 steel to postwelding, just behind the car, use the moulding cutter then, mill the chip area of cutting portion, the oil scupper of extruding tooth after heat treatment, is used edge grinding machine, open lip surface, the polishing chip area is used cylindrical grinder then, cylindrical grinding, use screw grinder again, processing screw tap screw thread forms cutting teeth, extruding tooth-cutter grinding.

Claims

1, a kind of helicla flute rib thread forming tap, comprise cutting portion, press section, handle, wherein cut guide gear, cutting is proofreaied and correct tooth and is constituted the portion that cuts, extruding guide gear, extruding are proofreaied and correct tooth and are constituted press section, be undercut between cutting portion and the press section, the press section back connects with tap holder, it is characterized in that: cutting portion is grooved in the shape of a spiral, press section is the rib type in the shape of a spiral, the cutting portion pitch angle gamma ₁With the press section pitch angle gamma ₂Identical, γ ₁=γ ₂Be the 2-8 degree, the cutting portion cross section number of teeth and press section cross section gear ratio are 1: 2, and the distance of cutting between the back partially extruding crest line of oblique sword is the 0-2.5 millimeter, cutting guide cone half-angle α ₁With extruding guide cone half-angle α ₂Identical, α ₁=α ₂Be the 3-8 degree, the back-off amount K of cutting teeth ₁, with extruding tooth back-off amount K ₂Identical, K ₁=K ₂Be the 0.7-1.5 millimeter, the oil scupper angle theta=45-60 degree of tooth cross section is proofreaied and correct in extruding.