CN2056620U

CN2056620U - Profile combined chain scraping out cutter

Info

Publication number: CN2056620U
Application number: CN 89214919
Authority: CN
Inventors: 李战群
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-08-10
Filing date: 1989-08-10
Publication date: 1990-05-02

Abstract

The utility model discloses a keyway pull broach for broaching workpieces on a broaching machine. The utility model is composed of two broaches; the first broach is mainly used for the processing of main cutting output; the second broach is used for the fine cutting to the bottoms and repairing side faces of the keyway of the broaching workpieces; therewith the dimensional precision and the smoothness of the workpieces are improved. The elementary structural form of the utility model is that the cutting positions of broach bodies are respectively provided with a groove-shaped positioning opening for inserting matched blade tooth pieces; the matching center of the broach bodies and the blade tooth pieces are connected and fastened by screws. Adopting the structure, the utility model not only overcomes the defect that broaches are discarded because of local excess wear, but also ensures that the workpieces fully achieve the standards of design dimensions.

Description

Profile combined chain scraping out cutter

The utility model relates to a kind of metal cutting tool, especially for a kind of combined type keyway broach of broaching machine broaching workpiece.

Broaching tool is a kind of widely used efficient cutter.In working angles, because broaching belongs to closed cutting, cutter can not in time be discharged with a large amount of heat in metal cuttings that the friction of broaching workpiece produces, and therefore, cutter tooth is subjected to very big pressure and friction when work.Because radiating effect is poor excessively, not only reduce the durability of cutter tooth, and be prone to the wearing and tearing of cutter tooth both sides land, cause the cutter tooth width dimensions to reduce and the situation that can't repair, thereby can not guarantee the dimensional requirement of workpiece.Make broaching tool under the situation of not giving full play to its proper efficiency, just caused and scrapped.In addition, for the processing of deep trouth workpiece, cutting blade length is longer owing to participating in simultaneously, and therefore, whole broaching tool cutter hub is longer, causes certain difficulty in manufacture process operations such as forging, heat treatment and alignment, has influenced the product qualified rate of cutter.Secondly, the key broaching tool is generally monolithic devices, and cutter tooth and cutter hub all adopt the high-speed superior steel to make, the manufacturing process complexity, and the high-quality steel of consumption are many, the cost height.

The purpose of this utility model provides that a kind of consumption high-quality steel are few, and manufacturing process is simple, and can guarantee and overcome after the tool wear influence that workpiece size precision and fineness are caused.Reduce a kind of special-shaped combination keyway broach of making the cost of charp tool.

Realize that the measure that the purpose of this utility model is taked is: this broaching tool is formed a cover by two, and is divided into first cutter and second cutter.The basic structure form of this cover broaching tool is: the interchangeable cutter tooth sheet by cutter hub and cutting tip constitutes combined type.For saving the high-quality high-speed steel, cutter hub adopts general carbon structural steel, and the cutting tip cutter tooth is made with the high-quality high-speed steel.Main cutting knife gear piece, the processing that is mainly used to undertake the main cutting amount are equipped with in the cutting position of the first cutter cutter hub.Because broaching tool often adopts multiple-pass broaching method when the part in addition of processing deep trouth or different groove depths.When multiple-pass, one broaching tool feed for several times, makes and leaves the uneven place of stairstepping on the cell wall, and fineness is poor.At this moment, can utilize second cutter that the broaching workpiece is carried out essence and cut and repair, improve the dimensional accuracy and the fineness of workpiece.The cutting position of second cutter is made up of two parts, and the front portion is the finishing tooth part, mainly finishes the fine finishining of first cutter cutting back keyway bottom land.The rear portion is the finishing toothed portion, mainly solves because the wearing and tearing of main broaching tool cutter tooth both sides land cause influencing the very little problem of the wide tooth of workpiece key.In order to reduce broach length, in the scope that equipment processing allows, increased by the first cutter cutting tip rise per tooth, thereby reached the shortening cutter hub, reduce the purpose of manufacturing process difficulty.

Utilize accompanying drawing to further describe embodiment of the present utility model.

Fig. 1 is the utility model first knife structure schematic front view;

Fig. 2 is the utility model second knife structure schematic front view;

Fig. 3 is that the utility model second knife structure is illustrated attached view.

In Fig. 1, label 1 is a cutter hub, and label 2 is main cutting knife gear pieces, has groove shape positioning port 4 at the cutting position of cutter hub 1, and in order to guarantee positioning accuracy, what present embodiment adopted is the locate mode of dovetail groove.Main cutting knife gear piece 2 made with the corresponding shape of groove shape positioning port be inserted in the notch, cooperate the centre with (the preferably 3) screw 3 more than at least 1 or adopt pin to link fastening at main cutting knife gear piece 2 and cutter hub 1.

In Fig. 2 and Fig. 3, label 5 is second cutter cutter hubs, and its cutting position has two groove shape positioning ports 9,10, is respectively applied for the smart grooving bed plate of plug-in mounting gear piece 6 and finishing key slot side cutter tooth sheet 8.Its locate mode and binding securing member mode are all identical with first cutter.Label the 7, the 11st, trip bolt.

Be used for being installed on the broaching tool cutter hub shank that broaching machine collet transmits broaching power among the above-mentioned figure, the tooth liter arrangement size of cutter tooth and the work tooth of determining etc. are to manufacture according to known method.When normal wear of cutter tooth part or improper damage, but the single-piece displacement.The broaching tool that adopts such scheme to make and now compares with same specification key broaching tool, not only overcome the overproof and defective of scrapping of its concentrated wear, and can guarantee that work piece reaches the design size standard fully.Can improve more than workpiece machining surface fineness 1-2 times, prolong about about 5 times of cutter life, simultaneously, also can save the high-quality steel of a large amount of manufacturing cutter hubs, reduce the manufacturing cost of cutter.

Claims

1, a kind of broaching cutters, form by cutter hub and cutter tooth, it is characterized in that: this cutter is formed a cover by two, every handle constitutes combined type by the interchangeable cutter tooth sheet at cutter hub and cutting position, have at least more than one groove shape positioning port (4.9.10) at the cutting position of cutter hub (1.5), mouth inserts main cutting knife gear piece (2) respectively in the groove, smart grooving bed plate gear piece (6) and finishing key slot side cutter tooth sheet (8), and the matching part of each cutter tooth sheet and cutter hub links with 1～3 securing member.

2, broaching cutters according to claim 1 is characterized in that: what groove shape positioning port (4.9.10) adopted is the form of dovetail groove.

3, broaching cutters according to claim 1 is characterized in that: the material of cutter hub (1.5) adopts general structural carbon steel.