CN201231355Y

CN201231355Y - Cutter

Info

Publication number: CN201231355Y
Application number: CNU2008201219459U
Authority: CN
Inventors: 蒋根良
Original assignee: Ningbo Ruiming Machinery Co Ltd
Current assignee: Ningbo Ruiming Machinery Co Ltd
Priority date: 2008-07-24
Filing date: 2008-07-24
Publication date: 2009-05-06
Anticipated expiration: 2018-07-24

Abstract

The utility model discloses a reamer bit. A reamer bit head has two sections, the first section is provided with a main cutting edge 1, the angle of the main cutting edge 1 and the plane is 40-50 degrees, the second section is provided with a main cutting edge 2 and auxiliary cutting edges, the angle of the main cutting edge 2 and the plane is 73-77 degrees, the auxiliary cutting edges are arranged to be continuously extending helical lands, and a helical cuttings chute is arranged between the helical lands. Because the reamer bit head has two sections, the original one-time cutting output is divided into two cutting outputs; in addition, the horizontal angles of the main cutting edges are small, the cutting resistance is greatly lowered, and the chance of damaging the cutting edges is reduced; the helical cuttings chute follows the cuttings discharging helical direction, cuttings can not break the cut cutting face, thereby better smooth finish of inner holes is kept, and the processing precision is improved.

Description

A kind of reamer

Technical field:

The utility model relates to the reamer that a kind of machining is used, and specifically is a kind of reamer that metal processing piece is reamed.

Background technology:

Existing application in metal processing piece is reamed common reamer, generally all be to be divided into reamer bar and reamer head two parts, the reamer head is provided with main cutting edge and front cutting edge, the angle of main cutting edge and horizontal plane is generally 75 °, the angle of front cutting edge and horizontal plane is generally 90 °, the chip area that forms between the front cutting edge is the axially-aligned along knife bar, and the trend that is to say its chip area is perpendicular to horizontal plane; And its blade head end also is blunt plane, therefore when fraising, at first to carry out roughing earlier with cutter or fluted drill, just ream then with reamer, this reamer is used for machining accuracy and the not exigent workpiece of surface smoothness is to be suitable for, but the workpiece that is used for machining accuracy and fineness are had relatively high expectations is inapplicable, its main cause is: 1, the angle of main cutting edge and horizontal plane is bigger, the angle of front cutting edge and horizontal plane is generally 90 °, resistance when rotary cutting is bigger, strengthened the load of motor, also damage blade easily, shorten the service life of reamer; 2, the smear metal of reamer when fraising is spiral discharging, and the chip area of existing reamer is vertical, do not comply with the natural chip removal trend of chip curl formula, smear metal is forced in the vertical chip area and discharges, be easy to scratch the cutting face of having cut, this is the big drawback that existing reamer exists on structural design.

The utility model content:

The technical problems to be solved in the utility model is, a kind of cutting resistance that can reduce main cutting edge and front cutting edge is provided, and increases the service life, and can make the smooth and easy discharge of borings simultaneously, and is difficult for scratching the reamer in cutting face.

Technical solution of the present utility model is that a kind of reamer with following structure is provided.A kind of reamer, comprise reamer bar, reamer head, the reamer head is made as two joints, establish main cutting edge I on the first segment, the angle of main cutting edge I and horizontal plane is 40 degree-50 degree, and second joint is provided with main cutting edge II and front cutting edge, and the angle of main cutting edge II and horizontal plane is 73 degree-77 degree, front cutting edge is arranged to the spiral land of extension continuously, is arranged to spiral chip area between the spiral land.

After adopting above structure, compared with prior art, the utility model tool reamer has following advantage: because the reamer head is made as two joints, the rotary cutting of the rotary cutting of first segment and second joint is equivalent to original cutting at one time amount is divided into cutting output twice, simultaneously because the horizontal sextant angle of its main cutting edge is little, Cutting trajectory live width relative narrower, this structural change, the cutting resistance of reamer is reduced greatly, not only reduced motor load, save electric energy, also reduced the chance of damage cutting edge simultaneously, prolonged the service life of reamer; Moreover, front cutting edge is arranged to the spiral land of extension continuously, be arranged to spiral chip area between the spiral land, this sharp spiral chip area is complied with the natural chip removal trend of chip curl formula, smear metal is more easily discharged in spiral chip area, thereby can not scratch the cutting face of having cut, keep the good fineness of endoporus, improve machining accuracy workpiece.

As a kind of improvement of the present utility model, the angle of described main cutting edge I and horizontal plane is 45 degree.This is the main cutting edge actual reaming role who serves as " fluted drill " formula when reaming because of first segment, and bore wall is uneven, so the cutting output of main cutting edge can not be too big.That is to say, the Cutting trajectory line width of cutting edge when its rotary cutting is too wide, certainly will strengthen the cutting output of cutting edge, increased the resistance of cutting edge, its consequence may cause the damage of cutting edge, and the Cutting trajectory line width too hour, do not reach the cutting output of cutting edge, caused the cutting output certain waste, and the Cutting trajectory line width of main cutting edge when its rotary cutting of 45 degree horizontal sextant angles can be too little not too large yet, suitable to benefit.

As also a kind of improvement of the utility model, the angle of main cutting edge II and horizontal plane is 75 degree.This is because after the reaming cutting of the main cutting edge of first segment, hole wall surface is more smooth, the width of the Cutting trajectory line during main cutting edge II rotary cutting can be wideer than the width of the Cutting trajectory line of first segment main cutting edge I, fully satisfy the cutting output of the second joint main cutting edge II, in like manner, its cutting output can not be too big or too little.

Roll over another as the utility model and improve, the angle of described spiral chip area extensions and horizontal plane is 75 degree.This is to rotate up discharge because the smear metal that the rotary cutting of reamer produces generally is a horizontal sextant angle with the spiral extensions about 75 degree, the angle of chip area extensions and horizontal plane is arranged to 75 degree, complied with the natural chip removal trend of chip curl formula, smear metal is more easily discharged in spiral chip area, thereby can not scratch the cutting face of having cut, the fineness that has kept endoporus has improved the machining accuracy to workpiece.

Another improves as the utility model, and the end face of described reamer head is arranged to tapered.Being arranged to tapered mainly is in order to match with positioning mandril in the machining hole that is inserted in workpiece that is provided with in the frock clamp, tapered the awl pinnacle that is to say reamer is on the end face of positioning mandril on the anchor clamps, similar to the reason that the two ends of rotating shaft are positioned, reamer when making the rotation fraising can not produce and rock, thereby provides technical guarantee for improving machining accuracy.

Further improve as the utility model, tapered point angle of described reamer head is set to 60 degree.

As another improvement of the utility model, described second joint is gone up spiral land around helical ring that toggle forms, and rear end helical ring diameter is more smaller than the diameter of front end helical ring.Rear end helical ring diameter is arranged to littler, is made the spiral land of reamer rear end can not carry out secondary cutting, ensured that bore area fineness no longer is damaged the inner hole wall that processes than the diameter of front end helical ring.

Another improves as the utility model, and described rear end helical ring diameter is than the little 0.005mm of diameter of front end helical ring.

Description of drawings:

Fig. 1 is the schematic diagram of existing reamer;

Fig. 2 is the schematic diagram of the utility model reamer;

Fig. 3 is the utility model reamer main cutting edge I, main cutting edge II horizontal sextant angle schematic diagram.

Shown in the figure: 1, reamer bar, 2, the reamer head, 3, main cutting edge I, 4, main cutting edge II, 5 and front cutting edge, 6, spiral land, 7, spiral chip area, 8, tapered, 9, point angle, 10-1, main cutting edge I horizontal sextant angle, 10-2, main cutting edge II horizontal sextant angle.

The specific embodiment:

Below in conjunction with the drawings and specific embodiments a kind of reamer of the utility model is described further:

Fig. 1 is existing reamer structural representation, and it comprises reamer bar 1 and reamer head 2 two parts, and the reamer head is provided with main cutting edge and front cutting edge.

Fig. 2 is a kind of reamer structural representation of the utility model, include reamer bar 1, reamer head 2, the reamer head is made as two joints, establish main cutting edge I3 on the first segment, the angle 10-1 of main cutting edge I3 and horizontal plane is 40 degree-50 degree, second joint is provided with main cutting edge II4 and front cutting edge 5, the angle 10-2 of main cutting edge II4 and horizontal plane is 73 degree-77 degree, front cutting edge 5 is arranged to the spiral land 6 of extension continuously, be arranged to spiral chip area 7 between the spiral land 6, be arranged to tapered 8 at the end face of reamer head 2, tapered 8 summit is a point angle 9, second joint is gone up spiral land 6 around helical ring that toggle forms, and rear end helical ring diameter is more smaller than the diameter of front end helical ring.

Be that the main cutting edge I3 on the first segment and the angle of horizontal plane are 45 degree as preferred embodiment of the utility model; The main cutting edge II4 on second joint and the angle of horizontal plane are 75 degree; Tapered 8 point angle 9 of reamer head 2 is set to 60 degree; Spiral land 6 is around helical ring that toggle forms, and its rear end helical ring diameter is than the little 0.005mm of diameter of front end helical ring.

Claims

1, a kind of reamer, comprise reamer bar (1), reamer head (2), it is characterized in that: described reamer head (2) is made as two joints, establish main cutting edge I (3) on the first segment, described main cutting edge I (3) is 40 degree-50 degree with the angle (10-1) of horizontal plane, second joint is provided with main cutting edge II (4) and front cutting edge (5), described main cutting edge II (4) is 73 degree-77 degree with the angle (10-2) of horizontal plane, described front cutting edge (50) is arranged to the spiral land (6) of extension continuously, is arranged to spiral chip area (7) between the described spiral land (6).

2, a kind of reamer according to claim 1 is characterized in that: described main cutting edge I (3) is 45 degree with the angle (10-1) of horizontal plane.

3, a kind of reamer according to claim 1 is characterized in that: the angle (10-2) of described main cutting edge II and horizontal plane is 75 degree.

4, a kind of reamer according to claim 1 is characterized in that: the angle of described spiral chip area (7) extensions and horizontal plane is 75 degree.

5, a kind of reamer according to claim 1 is characterized in that: the end face of described reamer head (2) is arranged to tapered (8).

6, a kind of reamer according to claim 5 is characterized in that: the point angle of described tapered (8) (9) is set to 60 degree.

7, a kind of reamer according to claim 1 is characterized in that: described second joint is gone up spiral land (6) around the formed helical ring of toggle (1), and its rear end helical ring diameter is more smaller than the diameter of front end helical ring.

8, a kind of reamer according to claim 7 is characterized in that: described rear end helical ring diameter is than the little 0.005mm of diameter of front end helical ring.