CN201205616Y

CN201205616Y - Sectional keyway broach

Info

Publication number: CN201205616Y
Application number: CNU2008200630326U
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: 2008-04-17
Filing date: 2008-04-17
Publication date: 2009-03-11
Anticipated expiration: 2018-04-17

Abstract

The utility model discloses a sectional type keyway pull broach. The edge of the pull broach comprises roughing teeth, precision teeth and finishing teeth. The pull broach has the following characteristics: the roughing teeth are divided into a plurality of roughing tooth sections; the rise per tooth is set as a waveform step-up structure; each roughing tooth section is composed of trapeziform teeth and integrated teeth, which are arranged in order; the top of each trapeziform tooth is set as a trapezoidally arranged structure; each trapeziform tooth is a longitudinal notch in the lengthwise direction; and the top of each integrated tooth is set as a rectangular structure. The sectional type keyway pull broach has the following advantages: the tooth depth and pitch of the pull broach can be adjusted according to requirements in order to ensure the strength of the edge; iron scraps produced in the process of cutting are fine and can be removed smoothly; the quality of a processed surface is high; cutting is quick; broaching force is low; the durability of the tool is good; and production efficiency is high.

Description

The segmented keyway broach

Technical field

The utility model relates to a kind of machining tool, is specifically related to a kind of segmented keyway broach.

Background technology

At present, the blade structure of the GB keyway broach that the processing keyway is used, as shown in Figure 1: the shape of blade is consistent with keyway shape, and the rise per tooth on roughing tooth evenly increases progressively, and its rise per tooth is that the oblique line rising distributes, referring to Fig. 2; 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, referring to Fig. 3.There is following shortcoming in this broaching tool:

1, cutter tooth is 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, and keyway has been processed the side caused scratch, influence surface quality, cutting force is increased;

2, to make the chip dividing groove slot pitch relatively need big distance could realize staggered for this chip dividing groove structure, and it is bigger to cause cutting the facewidth, and the iron filings of bulk are unfavorable for curling the chip removal difficulty greatly;

3, the groove width of chip dividing groove can not be excessive, for ease of processing, often adopts U-shaped chip dividing groove structure, and 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 utility model content

The purpose of this utility model is to overcome above-mentioned prior art deficiency, a kind of segmented keyway broach is provided, this segmented keyway broach has advantages such as brisk, the machined surface quality of cutting, cutter intensity height, wearability are good, easy to use, it can improve tool life, make the compact conformation of cutter hub, improve the broaching tool working (machining) efficiency.

For reaching the foregoing invention purpose, the technical scheme that is adopted is: a kind of segmented keyway broach, the blade of described broaching tool comprises roughing tooth, finishing tooth and the finishing teeth that is arranged in order, it is characterized in that: described roughing tooth is divided into some roughing tooth sections, its rise per tooth is set to wave ladder lift structure, and each described roughing tooth section is made up of tactic stepped tooth and complete tooth; The tooth top portion of described stepped tooth is set to trapezoidal arrangement architecture, is cannelure in the longitudinal direction; The tooth top portion of described complete tooth is set to rectangular configuration.

Segmented keyway broach according to the utility model provides is characterized in that: at least two of described roughing tooth section settings.

Segmented keyway broach according to the utility model provides is characterized in that: described roughing tooth is trapezoidal or arc-shaped structure on facewidth direction.

Segmented keyway broach according to the utility model provides is characterized in that: the roughing tooth in each described roughing tooth section is the wavy shaped configuration that ladder rises, and is provided with rise per tooth between the adjacent roughing tooth.

Segmented keyway broach according to the utility model provides is characterized in that: the minimum point of the peak of last described roughing tooth section and back one adjacent roughing tooth section is arranged on same level height.

By top narration as can be seen, the utlity model has following advantage:

1, every section forward part profile of tooth is the stepped tooth arrangement architecture after the roughing tooth segmentation, makes to downcut the iron filings triangularity, and is up-narrow and down-wide, is convenient to curl and chip removal;

2, stepped tooth is arranged, and makes the iron filings of cutting-out very tiny, and the volume bits can make the tooth pitch of broaching tool chip pocket and tooth depth reduce easily;

3, 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 profile of tooth, and does not have conventional broaching tool iron filings reinforcement situation, makes chip removal smooth and easy;

4, cutting tool shape is a triangle, makes point of a knife intensity height, and cutter is durable.

In sum, the overall merit of segmented keyway broach 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, the machined surface quality height; Cut briskly, cutting force is little, and tool life is good, the production efficiency height.

Description of drawings

Fig. 1 is the structure diagram of existing keyway broach;

Fig. 2 is the rise per tooth distribution schematic diagram of the blade tooth of existing keyway broach;

Fig. 3 is the structure chart of the tooth top chip dividing groove of existing keyway broach;

The structure diagram of the segmented keyway broach that Fig. 4 provides for the utility model;

The rise per tooth distribution schematic diagram of the segmented keyway broach that Fig. 5 provides for the utility model.

The stepped tooth profile of tooth schematic diagram of the segmented keyway broach that Fig. 6 provides for the utility model;

The complete tooth profile of tooth schematic diagram of the segmented keyway broach that Fig. 7 provides for the utility model.

The specific embodiment

The utility model will be further described below in conjunction with accompanying drawing:

The structure diagram of the segmented keyway broach that Fig. 4 provides for the utility model; The rise per tooth distribution schematic diagram of the segmented keyway broach that Fig. 5 provides for the utility model; The stepped tooth profile of tooth schematic diagram of the segmented keyway broach that Fig. 6 provides for the utility model; The complete tooth profile of tooth schematic diagram of the segmented keyway broach that Fig. 7 provides for the utility model.

As shown in the figure, a kind of segmented keyway broach, its blade is made up of roughing tooth, finishing tooth and finishing teeth, and its roughing tooth adopts segmentation structure, and its rise per tooth is arranged as wave ladder lift structure, roughing tooth can be divided into plurality of sections, be made up of two parts for every section, the forward part profile of tooth is the stepped tooth arrangement architecture on the facewidth, is cannelure in the longitudinal direction, the rear portion is divided into complete profile of tooth, does not process chip dividing groove on the profile of tooth.

The segmentation of roughing tooth can be divided into two sections or multistage.The forward part facewidth shape of roughing tooth often is a trapezium structure, also can be arc structure or other structure, and the tooth pitch on the facewidth also can be different size.The angle of stepped 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 stepped tooth shape, and the rear section tooth downcuts the trapezoidal metal surplus that stays after the cutting of forward part stepped tooth, and every section tooth has cut one section surplus on the keyway height.The multistage roughing tooth downcuts most of surplus of whole keyway height, finishes the roughing of keyway, and finishing tooth and the finishing teeth by routine processes remaining minority surplus again, finishes the machining of whole keyway height.

Segmented keyway broach provided by the utility model has following advantage: the tooth depth tooth pitch of broaching tool can reduce, and intensity improves; Iron filings are tiny, and chip removal is smooth and easy, the machined surface quality height; Cut briskly, cutting force is little, and tool life is good, the production efficiency height.

Though described embodiment of the present utility model in conjunction with the accompanying drawings, the protection domain that those of ordinary skills do not need various distortion that creativity work just can make or modification still to belong to this patent within the scope of the appended claims.

Claims

1, a kind of segmented keyway broach, the blade of described broaching tool comprises roughing tooth, finishing tooth and the finishing teeth that is arranged in order, it is characterized in that: described roughing tooth is divided into some roughing tooth sections, its rise per tooth is set to wave ladder lift structure, and each described roughing tooth section is made up of tactic stepped tooth and complete tooth; The tooth top portion of described stepped tooth is set to trapezoidal arrangement architecture, is cannelure in the longitudinal direction; The tooth top portion of described complete tooth is set to rectangular configuration.

2, segmented keyway broach according to claim 1 is characterized in that: at least two of described roughing tooth section settings.

3, segmented keyway broach according to claim 1, it is characterized in that: described roughing tooth is trapezoidal or arc-shaped structure on facewidth direction.

4, segmented keyway broach according to claim 1 is characterized in that: the roughing tooth in each described roughing tooth section is the wavy shaped configuration that ladder rises, and is provided with rise per tooth between the adjacent roughing tooth.

5, segmented keyway broach according to claim 1 is characterized in that: the minimum point of the peak of last described roughing tooth section and back one adjacent roughing tooth section is arranged on same level height.