CN2043146U

CN2043146U - Three-start spiral round hole push-type broach

Info

Publication number: CN2043146U
Application number: CN 89200585
Authority: CN
Inventors: 乔建国
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-01-11
Filing date: 1989-01-11
Publication date: 1989-08-23

Abstract

The utility model discloses a three-start spiral round hole push-type broach, comprising a broach body and a handle; the intermediate section of the broach body is in the cylinder shape, and the both sides of the broach body are circular cones; the entire broach body is naturally changed thinner from the intermediate section to the both ends of the broach body; the broach body is provided with a front course, a back course, a cutting tooth, a chip-breaker groove and finishing teeth; the broach tooth is a three-start spiral broach tooth, the lead angle are 0-43 DEG, and the taper lead angle are 30 minutes-4 DEG; the three-start spiral round hole push-type broach has the advantages of short broach body and long broach edge, having favorable smooth finish of processing work piece, having high accuracy, having easy manufacture, having low cost, and having high durability; the three-start spiral round hole push-type broach can process a round hole of work piece in thin type.

Description

Three-start spiral round hole push-type broach

The utility model belongs to cutting tool, and what be specifically related to that rectilinear motion cutting workpiece circular hole uses pushes away (drawing) cutter.

In known technology, existing people is improved to the helical tooth push broach by traditional annular tooth push broach, as Chinese patent " vertical pulling helical tooth broaching tool " (CN85201040U), though it has overcome many shortcomings of annular tooth push broach, cutting quality, efficient and cutter life have been improved relatively, but still have following deficiency: (1) segmentation assembled push broach processing is complicated, cost price is higher, use is inconvenient, and the long-pending little frangibility of axial cross section; (2) because this blade is single head, two or four-start spiral cutter tooth, so it locate on same circumference inadequately and to stablize, and influences cutting quality; (3) long owing to cutter hub, comparatively difficult for the slim workpiece of processing.

The purpose of this utility model task provides a kind of overall structure, cutter hub rectilinear motion spiral circular hole short, that blade is long, same circumferential registration is good pushes away (drawing) cutter.

Not only low, the easy processing of cost of this cutter, durable, but and the allowance workpieces with different sizes, especially for the processing of slim workpiece, be better than other any push broach.Use workpiece, the fineness of its cutting good, the accuracy to size height, be applicable to automatic or semi-automatic production line, can replace existing push-pull knife or reamer, tandem product can be used for plurality of devices and use.

The utility model is to constitute like this, its cutter hub is that the stage casing is cylinder, two ends are cone, and constitute whole mutually, make cutter hub attenuate naturally, be provided with cutting teeth, chip-breaker and finishing teeth by common helical tooth blade on the cutter hub from the stage casing to two ends, but cutter tooth is a lift angle is three spiral circumferential teeth of 0-43 °, and taper lead angle is 30 '-4 °, and with leading to making same circular cone, like this, help the allowance workpieces with different sizes.

This cutter can prolong cutter life after TiN handles.

Below in conjunction with description of drawings the utility model embodiment:

Accompanying drawing 1 is three spiral circular hole push broach structural representations.

Accompanying drawing 2 is that Fig. 1 is along B-B line sectional view.

Accompanying drawing 3 is three spiral round broach structural representations.

Among Fig. 1, (1) is that cutter hub, (2) are handle of a knife, and the section of this cutter hub (1) is that cylinder, both sides are that they constitute integral body mutually gradually to the cone of dual tapered; This front cone is leadingly to be back guiding (4) to (3), back circular cone, and back guiding circular cone also constitutes integral body with handle of a knife (2); Cutter hub (1) is provided with three spiral cutter teeths, and helical tooth blade is equally established cutting teeth (5), chip-breaker (6) and finishing teeth (7) routinely, and the lift angle of this cutter tooth is 30 °, and taper lead angle is 2 °.

Broaching tool structure among Fig. 2 is identical with the push broach structure, just its handle of a knife and leadingly be combined into integral body to cone.

The utility model ringless-type escape, should process slim workpiece, can make horizontal or vertical rectilinear motion, be applicable to that the processing of powder metallurgy, steel part and other material supplier's part is used.

Claims

1, the push broach of a kind of three spiral circular holes comprise have on handle of a knife (2), cutter hub (1), the cutter hub leading to (3), back guiding (4), cutting teeth (5), chip-breaker (6) and finishing teeth (7), it is characterized in that this cutter hub stage casing be cylinder, both sides be to the tapered cone in two ends, they constitute integral body mutually; This cutter tooth is three spiral cutter teeths, and its lift angle is 0-43 °, and taper lead angle is 30 '-4 °.

2,, it is characterized in that above-mentioned push broach can handle through TiN according to the described push broach of claim 1.