CN111015081A

CN111015081A - Drilling chamfering method capable of simultaneously completing drilling chamfering

Info

Publication number: CN111015081A
Application number: CN201911049999.8A
Authority: CN
Inventors: 金卫国
Original assignee: Jiangsu Vocational College of Information Technology
Current assignee: Jiangsu Vocational College of Information Technology
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2020-04-17

Abstract

The invention discloses a drilling chamfering method for simultaneously completing drilling chamfering, which comprises the following steps: step 1) selecting a drill bit for drilling and a chamfered drill bit sleeve with a cutting edge, and installing; step 2) the drill bit sleeve and the drill bit are arranged on a machine tool drill chuck and clamped tightly; step 3), adjusting the position; step 4), feeding the machine tool, and drilling a hole on the workpiece downwards by using the drill bit; step 5), continuing feeding the machine tool to chamfer the drilled hole; and 6) after chamfering is finished, retracting the cutter of the machine tool. According to the method, the drill bit sleeve is used during drilling, so that the chamfer can be immediately chamfered during drilling, and the method is time-saving and convenient.

Description

Drilling chamfering method capable of simultaneously completing drilling chamfering

Technical Field

The invention relates to a machining process for simultaneously drilling and chamfering, in particular to a drilling and chamfering method for simultaneously drilling and chamfering, and belongs to the field of machining.

Background

With the continuous development of precision manufacturing technology, the precision requirement of machining is higher and higher, the machining efficiency is higher and higher, and the cost of machining working hours in the manufacturing process is more and more important. At present, machining is carried out on a common drilling machine or a numerical control machine tool firstly, and after the drilling is finished, an additional drill bit is used for chamfering, so that labor and time are wasted.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the technical problems that drilling is firstly carried out, and another drill bit is used for chamfering after drilling is finished, so that labor and time are wasted in the prior art are solved. The invention aims to provide a drilling and chamfering method for completing chamfering while drilling.

The technical scheme adopted by the invention is as follows:

a drilling and chamfering method for simultaneously completing drilling and chamfering comprises the following steps:

step 1) selecting a drill bit for drilling and a chamfered drill bit sleeve with a cutting edge according to the diameter of a drilled hole, wherein the drill bit sleeve is sleeved and fixed on the drill bit, and a certain distance is reserved between the working end surface of the drill bit sleeve and the working end surface of the drill bit according to the drilling depth;

step 2) mounting the drill bit sleeved with the drill bit sleeve in the step 1 on a machine tool drill chuck and clamping;

step 3) adjusting the position to enable the drill bit to be aligned to the drilling position on the workpiece, and fixing the workpiece on the machine tool;

step 4), feeding the machine tool, and drilling a hole on the workpiece downwards by using the drill bit;

step 5), after the drill hole on the workpiece reaches the drill hole depth, the cutting edge at the working end of the drill sleeve contacts the workpiece, the machine tool continues to feed, and the drill hole is chamfered;

and 6) after chamfering is finished, retracting the cutter of the machine tool.

Preferably, in the present invention, the cutting edge of the bit pocket corresponds to a chip space of the drill in the circumferential direction.

Preferably, the inner diameter of the drill bit sleeve is consistent with the diameter of the drill bit, the outer diameter of the drill bit sleeve is determined according to the diameter of the drilled hole, and the outer diameter of the drill bit sleeve is larger than the maximum diameter of the chamfer.

Compared with the prior art, the method has the beneficial effects that: according to the method, the drill bit sleeve is used during drilling, so that the chamfer can be immediately chamfered during drilling, and the method is time-saving and convenient.

Drawings

FIG. 1 is a first schematic view of a chamfered bit pocket.

FIG. 2 is a second schematic view of a chamfered bit pocket.

FIG. 3 is a cross-sectional view of a chamfered bit pocket.

Fig. 4 is a cross-sectional view of O-O in fig. 3.

Fig. 5 is a view in the direction of P in fig. 3.

Fig. 6 is a drill assembly drawing of the drill and the bit holder and the workpiece of example 1.

Detailed Description

The technical solution of the present invention is described in detail below, but the scope of the present invention is not limited to the embodiments.

In order that the present invention may be more fully understood, reference is now made to the following description taken in conjunction with the accompanying drawings, which illustrate, by way of example, embodiments of the invention.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1:

step 1) selecting a drill bit 1 for drilling and a chamfered drill bit sleeve 2 with a cutting edge 3 according to the diameter of a drilled hole, sleeving the drill bit 1 with the drill bit sleeve 2 and fixing, and reserving a certain distance between the working end surface of the drill bit sleeve 2 and the working end surface of the drill bit 1 according to the drilling depth;

step 2) mounting the drill bit 1 sleeved with the drill bit sleeve 2 in the step 1 on a machine tool drill chuck and clamping;

step 3), adjusting the position to enable the drill bit 1 to be aligned to the drilling position on the workpiece 5, and fixing the workpiece 5 on the machine tool;

step 4), feeding the machine tool, and drilling a hole on the workpiece 5 downwards by the drill bit 1;

step 5), after the drill hole on the workpiece 5 reaches the drill hole depth, the cutting edge 3 at the working end of the drill sleeve 2 contacts the workpiece 5, the machine tool continues to feed, and the drill hole is chamfered;

and 6) after chamfering is finished, retracting the cutter of the machine tool.

According to the method, a special drill sleeve 2 is arranged outside a drill 1, the drill contacts a workpiece when drilling is started to drill, and the cutting edge 3 of the drill sleeve partially contacts the workpiece when the drilling is about to be finished to perform chamfering, so that the drilling and chamfering are finished at one time.

According to the method, a drill bit 1 for drilling is selected according to the diameter of the drill hole, a corresponding special chamfering drill bit sleeve 2 with a cutting edge is selected, the inner diameter of the drill bit sleeve is consistent with the diameter of the drill bit, and the outer diameter of the chamfering drill bit sleeve is determined according to the diameter of the drill hole and is slightly larger than the maximum diameter of the chamfer.

As shown in fig. 5, a narrow slit 4 is axially formed in the wall of the bit holder 2 according to the present embodiment, and the width of the narrow slit 4 is h. The slot 4 is designed to clamp the drill bit during installation. As shown in fig. 3, the outer diameter D of the bit housing 2 is determined according to the diameter D of the drill hole, and the outer diameter of the bit housing 2 is larger than the maximum diameter of the chamfer.

As shown in fig. 1 and 3, a cutting edge 3 for cutting a workpiece at the time of chamfering. The inclination angle of the cutting edge 3 is 30 °, 45 ° or determined according to the workpiece chamfer angle a. The cutting edges 3 are 1 or 2 or 3 or 4. The upper part of the cutting edge 3 is upwards provided with edge grooves, and the number of the edge grooves corresponds to the number of the cutting edges 3. The cutting edge 3 is provided with a rake angle X of between 0 ° and 8 ° and a relief angle Y of between 2 ° and 15 °.

In the method, the drill sleeve with the cutting edge is arranged on the position of a cutter handle of a drill, the relative positions of the drill sleeve and the drill are measured and adjusted, the cutting edge of the drill sleeve corresponds to a chip removal groove of the drill in the circumferential direction, the axial position of the drill sleeve is measured and adjusted according to the depth of a drilled hole, for processing a blind hole, the relative positions of the drill sleeve and the drill are strictly determined, and the chamfer size is ensured to be right in place when the drilled hole is in place. For machining through holes, care is taken to ensure that the drilled hole is completely drilled when the chamfer dimension is in place. Then, the drill is sleeved on a drill chuck of the machine tool and clamped.

When machining, the drill is used for drilling, and after drilling to a certain position, the cutting edge of the drill sleeve contacts with the workpiece to perform chamfering, and at this time, special attention needs to be paid to the actions of feeding and retracting to ensure that chips at the drilling part and chips at the chamfering part can be smoothly discharged. And after the drill bit reaches the corresponding position, finishing the machining, and completing drilling and chamfering at one time.

As noted above, while the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limited thereto. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A drilling and chamfering method capable of simultaneously completing drilling and chamfering is characterized by comprising the following steps:

step 1) selecting a drill bit (1) for drilling and a chamfered drill bit sleeve (2) with a cutting edge (3) according to the diameter of the drilled hole, wherein the drill bit sleeve (2) is sleeved on the drill bit (1) and fixed, and a certain distance is reserved between the working end surface of the drill bit sleeve (2) and the working end surface of the drill bit (1) according to the drilling depth;

step 2) mounting the drill bit (1) sleeved with the drill bit sleeve (2) in the step 1 on a machine tool drill chuck and clamping;

step 3), adjusting the position to enable the drill bit (1) to be aligned to the drilling position on the workpiece (5), and fixing the workpiece (5) on the machine tool;

step 4), feeding the machine tool, and drilling a hole on the workpiece (5) downwards by the drill bit (1);

step 5), after the drill hole on the workpiece (5) reaches the drill hole depth, the cutting edge (3) at the working end of the drill sleeve (2) contacts the workpiece (5), the machine tool continues to feed, and the drilled hole is chamfered;

and 6) after chamfering is finished, retracting the cutter of the machine tool.

2. A method according to claim 1, characterized in that the cutting edges (3) of the bit pocket correspond in the circumferential direction to the chip flutes of the bit (1).

3. Method according to claim 1, characterized in that the inner diameter of the bit housing (2) corresponds to the diameter of the drill bit (1), the outer diameter of the bit housing (2) being determined from the diameter of the drill hole, the outer diameter of the bit housing (2) being larger than the maximum diameter of the chamfer.