CN110560753A

CN110560753A - Drilling and rolling combined forming cutter

Info

Publication number: CN110560753A
Application number: CN201910846023.7A
Authority: CN
Inventors: 史东丽; 高建国; 周微; 陆轶凡; 高文娟
Original assignee: Changzhou Vocational Institute of Mechatronic Technology
Current assignee: Changzhou Vocational Institute of Mechatronic Technology
Priority date: 2019-09-09
Filing date: 2019-09-09
Publication date: 2019-12-13

Abstract

The invention belongs to the field of drilling tools, and relates to a drill and roller combined forming cutter. A drilling and rolling combined forming cutter comprises three parts, wherein the first part is a drill bit, the second part is a rolling cutter, the third part is a handle part, and the three parts are sequentially connected. The drill point part of drill bit be equipped with two chisel edges, the main cutting edge of drill point is the wave form sword, realizes super crowd's sharpness and intensity, the smear metal discharges more smoothly. Two secondary cutting edges are arranged on the main rear knife surface. The drill bit main body is provided with 2 cutting grooves with cylindrical spiral structures. According to the invention, the drilling and the rolling are processed simultaneously, so that the processing procedures are reduced, the processing time is shortened, and the processing efficiency is greatly improved; the slot type structure and the wave form cutting edge of optimizing realize super crowd's sharpness and intensity, and the smear metal is discharged more smoothly, and 140 apex angles have reduced the feed force of drilling initial stage, provide splendid self-centering ability to improve hole processingquality, improved hot rigidity and prevented long-pending bits.

Description

Drilling and rolling combined forming cutter

Technical Field

The invention belongs to the field of drilling tools, and relates to a drill and roller combined forming cutter.

Background

For deep hole processing with high surface precision requirement and aperture smaller than 30mm, at present, a traditional processing technology of drilling, reaming, rough reaming, fine reaming and honing holes is often adopted, a plurality of cutters are adopted in a plurality of processes, and the mode needs to be changed, so that the processing time is long, the efficiency is low, and the processing cost is high.

Disclosure of Invention

The invention aims to solve the technical problems that when small-diameter deep hole machining with high surface precision requirement is carried out, the production efficiency of the traditional machining process is low, the machining cost is high, the machining time is saved and the equipment utilization rate is improved by simultaneously machining the drilled and rolled holes, and the product quality is effectively ensured by one-time machining.

In order to solve the technical problems, the technical scheme of the invention is as follows:

A drilling and rolling combined forming cutter comprises three parts, wherein the first part is a drill bit, the second part is a rolling cutter, the third part is a handle part, the handle part is a clamping part of the drilling and rolling combined forming cutter, is used for being connected with a machine tool and transmitting torque and axial force, and the three parts are sequentially connected.

The drill point part of the drill is provided with two cross edges, and the included angle of the two cross edges, namely the vertex angle, is 140 degrees, so that the feeding force in the initial drilling stage is reduced, and the excellent self-centering capability is provided; the main cutting edge of the drill point is a waveform edge, thereby realizing the sharpness and strength of an ultra-group and discharging cuttings more smoothly. Two secondary cutting edges are arranged on the main rear knife surface. The drill bit main body is provided with 2 cutting grooves with cylindrical spiral structures, and the cylindrical spiral structures of the cutting grooves are provided with grooves which are spiral lines and are channels for containing chips and removing chips; the spiral angle is an included angle between a tangent line of an intersection line of an outer cylindrical surface of the drill and the cutting groove and an axis of the drill, and the spiral angle is selected to be 15-20 degrees.

further, the spiral angle is selected to be 20 degrees.

The outer surface of the rolling cutter is uniformly distributed with 4 rollers along the circumference, and the diameter l of each roller₁Is 4mm, length l₂＝3l₁Embedded in the roller groove; inner edge of rolling cutterThe axis is provided with a central hole, and the inside of the central hole is provided with a thread; the threaded mandrel is disposed in the central bore for supporting the roller.

Furthermore, the roller material is GCr15 or high-speed steel W18Cr 4V.

Furthermore, the drill-roll combined forming cutter main body is made of superfine hard alloy WC-6% Co-6% (W, Ti and Ta) with good strength, toughness and wear resistance, the drill bit part is a nano-structure nc-TiAlN coating combination, so that the cutter has a smooth surface and extremely high wear resistance, and the outstanding thermal stability and chemical stability provide effective protection for a cutting edge.

The invention has the following beneficial effects:

According to the invention, the drilling and the rolling are processed simultaneously, so that the processing procedures are reduced, the processing time is shortened, and the processing efficiency is greatly improved; through once processing the drilling and rolling hole, the processing clamping frequency is reduced, the processing precision is greatly improved, the product quality is effectively ensured, the rejection rate is reduced, and the qualification rate is increased. The unique coating process provides a smooth surface and extremely high wear resistance for the tool, and the outstanding thermal and chemical stability provides effective protection for the cutting edge. The slot type structure and the wave form cutting edge of optimizing realize super crowd's sharpness and intensity, and the smear metal is discharged more smoothly, and 140 apex angles have reduced the feed force of drilling initial stage, provide splendid self-centering ability to improve hole processingquality, improved hot rigidity and prevented long-pending bits.

Drawings

FIG. 1 is a schematic view of the structure of the cutter of the present invention.

Fig. 2 is a cross-sectional view of the inventive tool.

Fig. 3 is a bottom view of the inventive cutter.

In the figure: 1, a rake face; 2, edge; 3, spiral groove; 4 helix angle; 5, a roller; 6, roller grooves; 7, a central hole; 8, a threaded mandrel; 9 vertex angle; 10 a main cutting edge; 11 a chisel edge; 12 primary relief surfaces; 13 minor cutting edge.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

The technical scheme adopted by the invention is that the drill-roll combined forming cutter is characterized in that the whole material of the cutter is superfine hard alloy WC-6% Co-6% (W, Ti and Ta) with good strength, toughness and wear resistance, and the drill bit part is a nano-structure nc-TiAlN coating combination, so that the cutter has a smooth surface and extremely high wear resistance, and the outstanding thermal stability and chemical stability provide effective protection for a cutting edge. The roller material is GCr15 or high-speed steel W18Cr 4V. Mainly comprises 3 parts, as shown in figure 2, the first part is a drill bit, the second part is a rolling cutter, and the third part is a handle part which is a clamping part of a drill hob and is used for being connected with a machine tool and transmitting torque and axial force. As shown in fig. 3, a chisel edge 11 is designed at the drill tip of the drilling hob, as shown in fig. 1, the first part of the drill has 2 cutting grooves 3 which are cylindrical helical structures and are uniformly distributed, and the cylindrical helical grooves are spirally provided and are channels for containing chips and discharging chips; the spiral angle 4 is the included angle between the tangent of the intersection line of the outer cylindrical surface of the drill bit and the spiral groove and the axis of the drill bit, and the included angle is 20 degrees; the second part is a hob part, 4 rollers 5 are uniformly distributed on the hob along the circumference, the diameter of each roller is 4mm, the length of each roller is 12mm, and the rollers are embedded in the grooves 6; the central hole 7 is a matching mandrel; a threaded mandrel 8 cooperates with the central bore 7 for supporting the rollers. As shown in fig. 2, the drill tip angle 9 is designed to be 140 degrees, which reduces the feeding force at the initial stage of drilling and provides excellent self-centering capability to improve the hole processing quality. The main cutting edge is designed as a waveform edge, thereby realizing the sharpness and strength of super group and discharging the cuttings more smoothly. As shown in fig. 3, the main cutting edge 10 is designed as a waveform cutting edge, which realizes the sharpness and strength of the super group, and the chip discharge is smoother, and two chisel edges 11 are designed, and the included angle, i.e., the vertex angle, of the two chisel edges is 140 degrees. The major relief surface 12 is provided with two minor cutting edges 13.

the operation process is as follows: when the drill bit part drills, the feeding is performed intermittently, so that chip removal is facilitated, and after rough machining and semi-finish machining of the hole are completed, the rolling machining of the hole is performed.

Claims

1. A drilling and rolling combined forming cutter is characterized by comprising three parts, wherein the first part is a drill bit, the second part is a rolling cutter, the third part is a handle part, the handle part is a clamping part of the drilling and rolling combined forming cutter, is used for being connected with a machine tool and transmitting torque and axial force, and the three parts are sequentially connected;

The drill point part of the drill is provided with two cross edges (11), and the included angle of the two cross edges, namely the vertex angle (9), is 140 degrees; the main cutting edge (10) of the drill point is a wave-shaped edge, so that the sharpness and the strength of an ultra-group are realized, and the chip discharge is smoother; two auxiliary cutting edges (13) are arranged on the main rear cutter face (12); 2 cutting grooves (3) with cylindrical spiral structures are arranged on the drill bit main body, and the cylindrical spiral structures of the cutting grooves (3) are provided with grooves which are spiral lines and are channels for containing chips and removing chips; the spiral angle (4) is an included angle between a tangent line of an intersection line of the outer cylindrical surface of the drill bit and the cutting groove (3) and the axis of the drill bit, and the spiral angle (4) is selected to be 15-20 degrees;

The outer surface of the rolling cutter is uniformly distributed with 4 rollers (5) along the circumference, and the diameter l of each roller (5)₁Is 4mm, length l₂＝3l₁Embedded in the roller groove (6); a central hole (7) is formed in the rolling cutter along the axis, and threads are arranged in the central hole (7); the threaded mandrel (8) is arranged in the central hole (7) and is used for supporting the roller (5).

2. The drill-roll composite forming tool according to claim 1, wherein the drill bit is a nanostructured nc-TiAlN coating composite.

3. The drill-roll composite forming cutter as claimed in claim 1 or 2, wherein the material of the roller (5) is GCr15 or high-speed steel W18Cr 4V.

4. the drill-roll composite forming tool according to claim 1 or 2, wherein the three parts of the drill-roll composite forming tool are made of cemented carbide WC-6% Co-6% (W, Ti, Ta).

5. The drill-roll composite forming tool according to claim 3, wherein the three parts of the drill-roll composite forming tool are made of cemented carbide WC-6% Co-6% (W, Ti, Ta).

6. A drill-roll gang forming tool as claimed in claim 1, 2 or 5 wherein said helix angle is selected.

7. A drill-roll combination forming tool as claimed in claim 3, wherein the helix angle (4) is selected to be 20 degrees.

8. The drill-roll combination forming tool as claimed in claim 4, wherein the helix angle (4) is selected to be 20 degrees.