CN112428028A

CN112428028A - Auxiliary blade processing method for plastic product drilling processing drill bit

Info

Publication number: CN112428028A
Application number: CN202011313241.3A
Authority: CN
Inventors: 冯定; 洪腾蛟; 丁凤娟; 王鹏; 冯云
Original assignee: Yangtze University
Current assignee: Yangtze University
Priority date: 2020-11-20
Filing date: 2020-11-20
Publication date: 2021-03-02
Anticipated expiration: 2040-11-20
Also published as: CN112428028B

Abstract

The invention relates to a method for treating an auxiliary cutting edge of a drill for drilling plastic products, belonging to the field of machining. Grinding the triangular connecting part of the auxiliary cutting edge and the main cutting edge by a drilling drill according to an angle of 118 degrees; to grind an avoidance surface; therefore, the problems that the cutting linear speed of the secondary cutting edge of the drill bit is higher than that of the main cutting edge, the cutting amount at the hole wall is large, the thickness of the cutting chip is thicker than that of the hole center, and the generated hole wall is strained and deformed, cannot be positioned, is broken by the drill bit, is collided, is thrown and the like under the action of toughness of the plastic product during the drilling process of the existing plastic product are solved.

Description

Auxiliary blade processing method for plastic product drilling processing drill bit

Technical Field

The invention relates to a method for treating an auxiliary cutting edge of a drill for drilling plastic products, belonging to the field of machining.

Background

When the plastic product is drilled and processed, the cutting linear velocity of the secondary cutting edge of the drill bit is higher than that of the main cutting edge, so that the cutting amount at the hole wall is large, the thickness of the cutting cuttings is thicker than that at the hole center, and under the action of toughness of the plastic product, the dangers of hole wall strain deformation, incapability of positioning, drill bit breakage, material collision, material throwing and the like exist, and a great deal of inconvenience is brought to the drilling and processing of the plastic product. To the above-mentioned problem, the current solution is to make special fixture to solve the situation that the pore wall strains deformation, can't fix a position, drill bit rupture, hits the material, gets rid of the material through increasing the centre gripping dynamics, this kind of mode can play certain effect, but can't stop above-mentioned danger completely, and can increase manufacturing cost, reduce work efficiency. Therefore, there is a need for improvement thereof.

Disclosure of Invention

The invention aims to: the method for processing the auxiliary cutting edge of the drill bit for drilling and processing the plastic products can effectively solve the problems that the conventional plastic products have the risks of hole wall strain deformation, incapability of positioning, drill bit breakage, material collision, material throwing and the like because the cutting linear speed of the auxiliary cutting edge of the drill bit is higher than that of the main cutting edge during drilling and processing.

The technical scheme of the invention is as follows:

a method for processing a secondary blade of a drill for drilling plastic products is characterized in that: it comprises the following steps:

1) grinding the triangular connecting part of the auxiliary cutting edge and the main cutting edge by the drilling drill bit according to an angle of 118 degrees; to grind an avoidance surface;

2) when the triangular connection part of the auxiliary blade and the main blade is ground to form a triangular plane, the avoidance surface is primarily ground; the avoidance surface which is primarily ground comprises an avoidance edge a, an avoidance edge b and an avoidance edge c;

3) aligning the avoiding edge a of the avoiding surface with a grinding wheel of a knife grinder to continuously grind, so that the avoiding edge a of the avoiding surface forms a step shape; namely, the grinding of the avoiding surface is completed, and the secondary blade of the drill bit is processed and finished.

The drilling processing drill bit is a universal twist drill bit.

The avoiding surface is a plane or a plane with small curvature and approximate curvature.

The length of the avoiding edge b is larger than that of the avoiding edge c and the avoiding edge a.

The length of the avoiding side a is 1/6-1/5 of the diameter of the drill bit for drilling.

The invention has the beneficial effects that:

the drill for drilling and processing after treatment has the advantages of simple structure and good practicability, and solves the problems that the cutting linear speed of the auxiliary cutting edge of the drill is higher than that of the main cutting edge, so that the cutting amount at the hole wall is large, the thickness of a drilling chip is thicker than that of the hole center, and the generated hole wall is strained and deformed, cannot be positioned, and is broken, collided and thrown under the action of the toughness of a plastic product.

Drawings

FIG. 1 is a schematic view of a 118 angle abrasive drilling bit of the present invention;

FIG. 2 is a schematic view of an abraded avoidance surface of the present invention;

fig. 3 is an enlarged schematic view at a in fig. 2.

In the figure: 1. Drilling a drill bit; 2. a secondary blade; 3. an avoidance surface; 4. avoiding the edge a; 5. avoiding the edge b; 6. avoiding the edge c; 7. knife grinder emery wheel.

Detailed Description

The method for processing the auxiliary cutting edge of the drill for drilling the plastic products comprises the following steps:

grinding the triangular connection part of the auxiliary cutting edge 2 and the main cutting edge by the drilling drill bit 1 according to an angle of 118 degrees; the drilling bit 1 is a universal twist drill; to grind the avoidance surface 3; when the triangular connection part of the auxiliary blade 2 and the main blade is ground to form a triangular plane, the avoiding surface 3 is primarily ground; the avoiding surface 3 is a plane or a plane with approximate small curvature.

The avoidance surface 3 which is finished by primary grinding comprises an avoidance edge a4, an avoidance edge b5 and an avoidance edge c 6; the length of the avoidance edge b5 is greater than the avoidance edge c6 and the avoidance edge a 4. The length of the avoiding side a4 is 1/6-1/5 of the diameter of the drilling bit 1.

Aligning the avoiding edge a4 of the avoiding surface with a grinding wheel 7 of the knife grinder to continuously grind, so that the avoiding edge a4 of the avoiding surface 3 forms a step shape; the grinding of the avoiding surface 3 is completed, namely the processing of the secondary blade 2 of the drilling bit 1 is completed.

The drill bit 1 for drilling processing after treatment has simple structure and good practicability, and is ground by the avoiding surface 3; the cutting linear speed of the auxiliary blade 2 is reduced; the invention solves the problems that the cutting linear speed of the secondary blade of the drill bit is higher than that of the main blade, so that the cutting amount at the hole wall is large, the thickness of the drill cuttings is thicker than that at the hole center, and the generated hole wall is strained and deformed, cannot be positioned, and is broken, collided and thrown under the action of the toughness of the plastic product. The auxiliary cutting edge treatment of the invention does not damage the drilling bit 1, and the grinding and removing of the avoiding surface 3 can still be used as a common bit. Meanwhile, the invention is not only limited to the drilling operation of plastic parts, but also can be used for the drilling operation of non-metal parts such as rubber parts, PCB plates and the like.

Claims

1. A method for processing a secondary blade of a drill for drilling plastic products is characterized in that: it comprises the following steps:

1) grinding the triangular connecting part of the auxiliary cutting edge (2) and the main cutting edge by the drilling drill bit (1) according to an angle of 118 degrees; to grind an avoidance surface (3);

2) when the triangular connection part of the auxiliary blade (2) and the main blade is ground to form a triangular plane, the avoidance surface (3) is primarily ground; the avoidance surface (3) which is ground preliminarily comprises an avoidance edge a (4), an avoidance edge b (5) and an avoidance edge c (6);

3) aligning the avoiding edge a (4) of the avoiding surface (3) with a grinding wheel (7) of the knife grinder to continuously grind, so that the avoiding edge a (4) of the avoiding surface (3) forms a step shape; namely, the avoidance surface grinding (3) is finished, namely the auxiliary cutting edge of the drill bit is processed in a drilling mode.

2. The method for treating the secondary blade of the drill for drilling the plastic products as claimed in claim 1, wherein: the drilling machining drill bit (1) is a universal twist drill bit.

3. The method for treating the secondary blade of the drill for drilling the plastic products as claimed in claim 1, wherein: the avoiding surface (3) is a plane or a plane with small curvature and approximate to the plane.

4. The method for treating the secondary blade of the drill for drilling the plastic products as claimed in claim 1, wherein: the length of the avoiding edge b (5) is greater than that of the avoiding edge c (6) and the avoiding edge a (4).

5. The method for treating the secondary blade of the drill for drilling plastic products as claimed in claim 4, wherein the method comprises the following steps: the length of the avoiding edge a (4) is 1/6-1/5 of the diameter of the drilling bit (1).