CN2649236Y

CN2649236Y - Motorcycle drum brake front cover worm hole composite drilling bit

Info

Publication number: CN2649236Y
Application number: CN 03278046
Authority: CN
Inventors: 陈军
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-08-26
Filing date: 2003-08-26
Publication date: 2004-10-20
Anticipated expiration: 2013-08-26

Abstract

The utility model discloses a compound drill head with multiple steps endless screw of the motorcycle which located at the front cover of the drum arresting gear of the motorcycle, the compound drill head can be formed by one-time processing and has a high degree of accuracy. The drill head consists of a cone-type drill shank and multiple steps corresponding to the endless screw hole of the drum arresting gear front cover which owns similar coaxial-lines, the diameter of the steps increase gradually along the axial line of the drill body from the beginning of the end to the cone-type drill shank. The utility model can be formed at one time, compared with other techniques, and has a high degree of accuracy, high stiffness, convenient manufacture, and low cost, and especially can be applied in the processing of the endless screw hole of the drum arresting gear front cover of the motorcycle.

Description

Motor bike drum brake mechanism protecgulum worm hole composite drill bit

One, technical field

The utility model relates to a kind of composite drill bit, particularly a kind of composite drill bit that is used to process motor bike drum brake mechanism protecgulum worm hole.

Two, background technology

Motor bike is a kind of important vehicle, and its drg quality quality is directly connected to people's life security.The worm hole of machining brake protecgulum is a drill bit of using Φ 4.9, Φ 12, Φ 14.5 respectively at present, through three drillings, adding Φ 15 reamer millings forms, need 4 procedures altogether, because the worm hole of drg protecgulum is to place worm screw, for guaranteeing worm screw running accuracy and sensitivity, adapt to 3000 rev/mins demand, 1), pory right alignment is not more than 0.03 must reach:; 2), roughness of surface 3.2; 3), the stepped hole axial dimension is accurate, controls endplay effectively.From the condition of cutting, the matrix that is cut is an aluminum alloy, and blank has cast out partly hole among the figure, and the processing cutting face is a semicircle, makes cutter crooked easily.Its shortcoming is: 1, the precision of worm hole multi-hole coaxial is low, and the worm screw running effect after the assembling is poor; 2, condemnation factor height, service life is short, and production efficiency is low.

Three, summary of the invention

Goal of the invention of the present utility model provides a kind of can time processing the shaping and the high motor bike drum brake mechanism protecgulum worm hole composite drill bit of precision.

Goal of the invention of the present utility model is achieved like this: a kind of motor bike drum brake mechanism protecgulum worm hole composite drill bit, comprise the taper drillstock and bore body, it is characterized in that: described brill body is the step with same axis that adapts with motor bike drum brake mechanism protecgulum worm hole, and the diameter of described step begins from the end to become big gradually to taper drillstock place along the axis direction that bores body.

For the entrance face that makes motor bike drum brake mechanism protecgulum worm hole obtains processing, described step is used for chamfering and the flat maximum gauge step of ream being provided with taper drillstock connection.Described motor bike drum brake mechanism protecgulum worm hole composite drill bit also can be made into many steps of hard alloy taper shank composite drill bit.

For guaranteeing that composite drill bit has enough rigidity, small diameter portion length and its diameter ratio of described step are not more than 3.

Compared with prior art, the utility model adopts a clamping grinding of many steps to form, and its advantage is: 1, right alignment is good, and guidance quality is good, precision height, rigidity height; 2, easy to make, the production efficiency height; 3, owing to move after synchronizing them by the reconditioning axial dimension, can repeated use, thereby cost is low.

Four, description of drawings

Fig. 1 is the utility model structural representation;

Fig. 2 is a brake for motorcycle protecgulum scheme drawing;

Fig. 3 is the partial enlarged drawing of brake for motorcycle protecgulum worm hole.

Five, the specific embodiment

A kind of motor bike drum brake mechanism protecgulum worm hole composite drill bit described in the utility model, comprise taper drillstock 1 and bore body 2, boring body 2 is the steps with same axis 3 that adapt with motor bike drum brake mechanism protecgulum worm hole, and the diameter of described step 3 begins from the end to become big gradually to taper drillstock 1 place along the axis direction that bores body 2.For the entrance face that makes motor bike drum brake mechanism protecgulum worm hole also can obtain processing, step 3 is used for chamfering and the flat maximum gauge step of ream being provided with taper drillstock 1 connection.Motor bike drum brake mechanism protecgulum worm hole composite drill bit also can be made into many steps of hard alloy taper shank composite drill bit according to need.For guaranteeing that composite drill bit has enough rigidity, small diameter portion length and its diameter ratio of described step 3 are not more than 3.

The method for making of motor bike drum brake mechanism protecgulum worm hole composite drill bit described in the utility model is: with band taper shank Φ 16 standard fluted twist drills, with taper shank location and clamping, in with one procedure, divide multiple operation to be ground to the step drill bit through cutter and tool grinder, the right alignment height of its each surface of revolution, then, in the grinding machine upper shed, wherein must be noted that the making key element:

1, for guaranteeing compound enough rigidity that is drilled with, should make small diameter portion length and its diameter ratio≤3;

2, all make down back taper as the external diameter of large and small diameter parts, but major diameter partly is used for chamfering or ream at ordinary times, then this part external diameter just needn't be made back taper, for reducing the friction of drill bit and hole wall, it is the helical surface of 1-2 degree that the land of small diameter portion should grind off normal direction (perpendicular to helix line) relief angle.

3, composite drill bit also can be made into many steps of hard alloy taper shank composite drill bit according to need.

When processing motor bike drum brake mechanism protecgulum worm hole, can divide thick brill and smart boring to finish, but all be to cut simultaneously by compound brill to finish.

Claims

1, a kind of motor bike drum brake mechanism protecgulum worm hole composite drill bit, comprise taper drillstock (1) and bore body (2), it is characterized in that: described brill body (2) is the step with same axis (3) that adapts with motor bike drum brake mechanism protecgulum worm hole, and the diameter of described step (3) begins from the end to locate to become gradually big to taper drillstock (1) along the axis direction that bores body (2).

2, motor bike drum brake mechanism protecgulum worm hole composite drill bit according to claim 1 is characterized in that: described step (3) is used for chamfering and the flat maximum gauge step (4) of ream being provided with taper drillstock (1) connection.

3, motor bike drum brake mechanism protecgulum worm hole composite drill bit according to claim 1, it is characterized in that: small diameter portion length and its diameter ratio of described step (3) are not more than 3.