CN201211577Y

CN201211577Y - Combined round hole broach

Info

Publication number: CN201211577Y
Application number: CNU2008200641814U
Authority: CN
Inventors: 陈里; 罗彬�; 方元锋
Original assignee: SICHUAN TIANHU MACHINES CO Ltd
Current assignee: SICHUAN TIANHU MACHINES CO Ltd
Priority date: 2008-07-10
Filing date: 2008-07-10
Publication date: 2009-03-25
Anticipated expiration: 2018-07-10

Abstract

The utility model discloses a composite round broach. An edge part of the broach comprises rough cutting teeth, accurate cutting teeth and finishing teeth which are arranged in turn, wherein the rough cutting teeth is divided into two tooth segments and consists of triangular teeth and complete teeth which are sequentially arranged; the rise per tooth of the rough cutting teeth is arranged to be in a sawtooth rising structure; the triangular teeth are arranged to have an equant array arrangement structure; a longitudinal groove is arranged in the length direction; and the complete teeth are arranged to have a complete circular structure. The broach has the advantages that the tooth depth and tooth pitch of the broach can be regulated according to need so as to guarantee the strength of the edge part, and the broach is tiny in iron chips obtained after cutting, smooth to remove chips, high in the quality of processed surface, light and quick to cut, small in broaching force, high in tool durability, high in production efficiency and remarkable in effects especially when processing slender holes and deep holes.

Description

The combined type round broach

Technical field

The utility model belongs to a kind of combined type round broach in a kind of aperture knife tool.

Background technology

At present, the blade structure of the used round broach of processing circular hole is commonly used has with wide formula, wheel cut, comprehensively take turns three kinds of cuts.Rise per tooth with wide formula round broach and comprehensive wheel cut round broach roughing tooth evenly increases progressively, its roughing tooth rise per tooth is that the oblique line rising distributes, for ease of chip removal, on each tooth, grind chip dividing groove, and the chip dividing groove on the tooth of front and back is staggered, wheel cut round broach on the roughing tooth by per two teeth or more than two teeth be one group, every group of rise per tooth evenly increases progressively, diameter unanimity in its every group or every group of interior back one tooth diameter are slightly less than corresponding last tooth, adjacent teeth is provided with rise per tooth, the roughing tooth rise per tooth is that the waveform rising distributes, for ease of chip removal, in every group, grind chip dividing groove on the forward part tooth, and the rear section tooth is a round tooth, do not grind chip dividing groove, but there is following shortcoming in the broaching tool of conventional structure:

1, with wide formula round broach with comprehensively take turns cut round broach cutter tooth when cutting the chipping allowance that forms because of rise per tooth, also to downcut the iron filings that last tooth stays because of the mill chip dividing groove, so in the iron filings that downcut, can form a reinforcement, it is difficult that iron filings are curled, need bigger chip space, increase the cutter material cost and reduce cutter intensity, and the machined surface face is caused scratch, influence surface quality, cutting force is increased; And the structure of wheel cut round broach adds the per tooth rise per tooth to be twice, to have defectives such as above-mentioned chip space increasing, roughness of machining surface and cutter intensity variation equally.

2, this chip dividing groove structure makes the chip dividing groove slot pitch relatively need big distance, and it is bigger to cause cutting the facewidth, and big block iron filings are unfavorable for curling the chip removal difficulty.

3, often adopt U-shaped chip dividing groove structure with wide formula round broach, the side relief angle of U-shaped chip dividing groove is zero, during cutting and the iron filings friction big, corner wear is fast, the broaching tool durability is low; The chip dividing groove of wheel cut and comprehensive wheel cut round broach is an arc-shaped structure, and the angle, rear flank is big, but because of big increase relative with rise per tooth of its facewidth is twice, also causes the broaching tool durability to reduce.

The utility model content

The purpose of this utility model provide a kind ofly have cutting brisk, machined surface quality, cutter hub intensity height, wearability is good, easy to use can improve tool life, makes the compact conformation of cutter hub, improves the combined type round broach of broaching tool working (machining) efficiency.

The technical solution of the utility model is shown in Fig. 1,2,3,4, the blade of broaching tool comprises roughing tooth, finishing tooth and the finishing teeth that is arranged in order, roughing tooth is divided into two sections, form by tactic lance tooth and complete tooth, its rise per tooth is set to the zigzag lift structure, lance tooth is five equilibrium arrayed structure triangular in shape on circumference, be cannelure in the longitudinal direction, complete tooth is set to the complete circle structure, the structure that roughing tooth diameter in the roughing tooth section linearly rises is provided with rise per tooth between the adjacent roughing tooth.The rise per tooth of last described roughing tooth section and back one described roughing tooth section initial sum terminal point diameter dimension basically identical is set, also can be inequality.

Every section forward part profile of tooth is branch arrayed structures such as triangle after the segmentation of the utility model roughing tooth, makes to downcut the iron filings triangularity, and is up-narrow and down-wide, the iron filings that downcut are very tiny, the volume bits are convenient to chip removal easily, and the tooth pitch of broaching tool chip pocket and tooth depth are reduced.Every section rear section profile of tooth is complete profile of tooth after the segmentation, and the tiny iron filings muscle that stays after the forward part cutting is very easy to be excised by the rear section tooth, and does not have conventional broaching tool iron filings reinforcement situation, makes chip removal smooth and easy.Cutting tool shape is a triangle, makes point of a knife intensity height, and cutter is durable.

The utility model advantage is: the tooth depth tooth pitch of broaching tool can reduce, and intensity improves; Iron filings are tiny, and chip removal is smooth and easy, and the machined surface quality height cuts briskly, and cutting force is little, and tool life is good, the production efficiency height; Especially particular significant effect when processing slim hole and deep hole.

Description of drawings

The structural representation of Fig. 1 combined type round broach;

Fig. 2 is the odd number tooth chip dividing groove schematic diagram and the complete tooth schematic diagram of even number tooth of combined type round broach;

The rise per tooth distribution schematic diagram of Fig. 3 combined type round broach.

The specific embodiment

The utility model is implemented by technique scheme:

The segmentation of roughing tooth generally is divided into two sections, and the broaching tool roughing tooth bigger to surplus can be divided into multistage.The forward part castellated shape of roughing tooth often is a triangular structure, also can be arc structure or other structure, is the five equilibrium arrangement architecture on circumference.The angle of lance tooth also can be selected different numerical value according to different broaching tools.

During use, the forward part tooth machines away the iron filings of lance tooth shape, the rear section tooth downcuts the triangle metal surplus that stays after the cutting of forward part lance tooth, finish the roughing of circular hole, finishing tooth and finishing teeth by routine processes remaining minority surplus again, finishes the machining on whole circular hole surface.

Combined round hole broach provided by the utility model has following advantage: the tooth depth tooth pitch of broaching tool can subtract Little, intensity improves; Iron filings are tiny, and chip removal is smooth and easy, the machined surface quality height; Cut briskly, cutting force is little, Tool life is good, the production efficiency height; Especially particular significant effect when processing slim hole and deep hole.

Claims

1, a kind of combined type round broach, the blade of broaching tool comprises roughing tooth, finishing tooth and the finishing teeth that is arranged in order, it is characterized in that: roughing tooth is divided into two sections, form by tactic lance tooth and complete tooth, its rise per tooth is set to the zigzag lift structure, lance tooth is set to five equilibrium arrayed structure, is cannelure in the longitudinal direction, complete tooth be set to the complete circle structure.

2, combined type round broach according to claim 1 is characterized in that: described roughing tooth leading portion five equilibrium triangular in shape on circumference distributes, and back segment is a circular configuration.

3, combined type round broach according to claim 1 is characterized in that: the structure that the roughing tooth diameter in the described roughing tooth section linearly rises is provided with rise per tooth between the adjacent roughing tooth.

4, combined type round broach according to claim 1, it is characterized in that: the initial sum terminal point diameter dimension basically identical of the initial sum terminal point diameter of last described roughing tooth section and back one described roughing tooth section, the distribution indention lift structure of its rise per tooth also can be inequality.