WO2012152101A1

WO2012152101A1 - Indexable expanding drill

Info

Publication number: WO2012152101A1
Application number: PCT/CN2012/071225
Authority: WO
Inventors: 范晖; 唐弘斌; 张卫群; 陈英
Original assignee: 上海锅炉厂有限公司
Priority date: 2011-05-10
Filing date: 2012-02-16
Publication date: 2012-11-15
Also published as: PL222659B1; PL403058A1; CN102389992A; ZA201300782B

Abstract

Disclosed in the present invention is an indexable expanding drill comprises a cutter body (2) and a guide head (1) arranged on the cutter body. The cutter body is provided with a double spiral chip-removing groove (201). The guide head is provided with two symmetrical outer blades (101) using indexable blades installed symmetrically outside the guide head. The expanding drill reduces generating eccentric distance, improves the rigidity of the cutter, and reduces vibration during cutting, thus improving cutting efficiency, ensuring automatic chip-removing- holding capacity and reducing cutter friction during cutting.

Description

A » reamer

Technical field

The invention relates to an indexable reamer. Background technique

In power station boilers, a large number of tubes are used in the headers. In order to ensure the quality of the welding assembly, the inner diameter of the tubes must be uniform. Therefore, the inner diameter of the tubes needs to be reamed. The ratio of length L to aperture D is >6 ( The structure is shown in Figure 1).

At present, the processing of such parts adopts automatic feeding and CNC machining, so the cutting tools require uniformity and durability, ensuring product accuracy and efficiency. The existing indexable rotor on the market is a shallow hole drill (see Figure 2). The maximum cutting depth is 4 times the diameter. The shallow hole drill uses two inner and outer blades, and the high wear resistant alloy blade is used as the outer edge 11. Toughness The high blade acts as the inner edge 22, the inner edge 22 is centered during cutting, and the outer edge 11 is cut, so the drill bit has certain advantages for drilling a solid hole. However, for the reaming, the drill has a large problem, the positions of the inner edge 22 and the outer edge 11 are asymmetrical (as shown in FIG. 3), and the inner edge 22 and the outer edge 11 have an angle β, since the inner edge does not participate in the cutting. Positioning, relying solely on external cutting, is prone to offset and vibration, and the tool has poor durability. Summary of the invention

The invention provides an indexable reamer, which improves processing efficiency and processing quality.

In order to achieve the above object, the present invention provides an indexable reamer, the reamer comprising a cutter body and a guide head disposed on the cutter body;

a double spiral flute is arranged on the cutter body;

Two symmetrical outer edges are provided on the guide head.

The guide head is further provided with an inner cold cutting liquid hole.

The cutter body is made of 40Cr steel.

The diameter of the guide head is l~1.2 mm larger than the diameter of the body.

The width of the double spiral flute is 1/4~1/5 of the circumferential length of the cutter body, and the depth is the diameter of the cutter body.

1/3.

The outer blade adopts an indexable insert, and the blade is symmetrically mounted on the outer side of the guide head. The invention reduces the eccentricity of the cutting process, improves the rigidity of the tool, reduces the generation of vibration, improves the cutting efficiency, ensures the ability of automatically discharging chips and chipping during the cutting process, and reduces the friction of the cutter body. DRAWINGS

1 is a schematic view showing the structure of a pipe which needs to be reamed in the background art;

2 is a schematic structural view of a shallow hole drill in the background art;

3 is a schematic view of a slanting structure of a shallow hole drill in the background art;

4 is a schematic structural view of an indexable reamer provided by the present invention;

Figure 5 is a schematic view of the directional structure of an indexable reamer according to the present invention;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be specifically described with reference to FIGS. 4 and 5.

As shown in FIG. 4, the present invention provides an indexable reamer comprising a cutter body 2 and a guide head 1 disposed on the cutter body 2;

The cutter body 2 is made of 40Cr steel;

In this embodiment, the diameter of the guide head 1 is larger than the diameter of the cutter body by 1 mm to reduce the friction between the cutter body and the workpiece;

The double-screw flute 201 is disposed on the cutter body, and the double-screw flute 201 satisfies the rigidity of the cutter body, and the depth and the width of the spiral groove are increased as much as possible, and the spiral groove is required to be smooth and smooth;

The width of the double spiral flutes 201 is generally 1/4 to 1/5 of the circumferential length of the cutter body, and the depth is about 1/3 of the diameter of the cutter body, and the spiral groove is required to be smooth and smooth.

In this embodiment, the groove width of the double spiral flutes 201 is increased by l~2 mm than the width of the spiral groove of the same size shallow hole drill, which can ensure chip discharge;

The guiding head is provided with two symmetrical outer edges 101 (shown in FIG. 5). The outer blade 101 adopts an indexable insert, and the blades are symmetrically mounted on the outer side of the guiding head, and the double blades are symmetrically arranged to reduce the eccentricity during the cutting process. The generation of the tool increases the rigidity of the tool and reduces the generation of vibration, and the double edge simultaneously participates in the cutting to improve the cutting efficiency;

The inner head is also provided with an inner cold cutting liquid hole 102, which can take away the cutting heat in time during the cutting process, rapidly cool the tool and the workpiece, and also timely remove the short chips during the cutting process to ensure the durability of the tool. #.

Large size double-coil flutes and guide heads ensure automatic chip removal and chip removal during cutting, reducing tool body friction.

Although the present invention has been described in detail by the preferred embodiments thereof, it should be understood that the foregoing description should not be construed as limiting. Various modifications and alterations of the present invention will be apparent to those skilled in the art. Therefore, the scope of the invention should be limited by the appended claims.

Claims

Rights request:

An indexable reamer, characterized in that the reamer comprises a cutter body (2) and is disposed on the cutter body

(2) the upper guide head (1);

a double spiral flute (201) is arranged on the cutter body;

Two symmetrical outer edges (101) are provided on the guide head.

2. The indexable reamer according to claim 1, wherein said guide head is further provided with an inner cold cutting fluid hole (102).

3. The indexable reamer according to claim 1, wherein the cutter body (2) is made of 40Cr steel.

4. The indexable reamer according to claim 1, wherein the diameter of the guide head (1) is l~1.2 mm larger than the diameter of the body.

5. The indexable reamer according to claim 1, wherein the width of the double spiral flute (201) is 1/4 to 1/5 of the circumferential length of the cutter body, and the depth is a cutter body. 1/3 of the diameter.

6. The indexable reamer according to claim 1, wherein said outer blade (101) employs an indexable insert, and the blade is symmetrically mounted on the outer rim of the guide head.