CN108067949B

CN108067949B - Radial precision grinding method for spiral milling cutter

Info

Publication number: CN108067949B
Application number: CN201611015516.9A
Authority: CN
Inventors: 李先健; 周良明; 李维亮; 罗志勇; 江波; 胥志兵; 王继均; 邓钦文
Original assignee: Chengdu Aircraft Industrial Group Co Ltd
Current assignee: Chengdu Aircraft Industrial Group Co Ltd
Priority date: 2016-11-18
Filing date: 2016-11-18
Publication date: 2021-08-03
Anticipated expiration: 2036-11-18
Also published as: CN108067949A

Abstract

The invention discloses a radial precision grinding method of a spiral milling cutter, which is characterized in that the milling cutter is arranged on a main shaft of a machine tool, and the rear angle of each cutting edge of the milling cutter is colored; the main shaft is rotated to the left, and the notch trial cutting of the semi-finished part is finished by one-time feeding; detecting the size of a notch of the part, and checking the coloring state of the blade; grinding the uncolored blade edges or grinding the uncolored blade edges in sequence; trial cutting and repeating the operation until the size of the notch of the part meets the technical requirement. The grinding method provided by the invention changes the traditional milling cutter static precision grinding mode, realizes the radial working precision adjustment of the milling cutter, can finish the high-precision notch processing of the part by one-time feeding, improves the notch milling production efficiency of the part, has stable processing quality and simple operation, and is suitable for the high-precision notch milling processing of large-batch parts.

Description

Radial precision grinding method for spiral milling cutter

Technical Field

The invention relates to the field of machining, in particular to a radial precision grinding method of a spiral milling cutter, which is suitable for high-precision notch milling of large-batch parts.

Background

In the aviation manufacturing industry, the number of groove-shaped parts of military and civil aircraft is large. The high accuracy notch of cell type part mills mainly through numerically-controlled machine tool milling and ordinary milling machine and mills, and the part notch precision that the numerically-controlled machine tool milled is good, the steady quality, but numerically-controlled machine tool mills and carries out with the mode of going eager, and the part surface can form the crest, and reciprocating stroke is many, and the processing cost is high, and the shallow slot part notch quality that utilizes the deep trouth that saw bit milling cutter milled or end milling cutter milled with ordinary milling machine is unstable, and the number of times of feed is many, needs the operator to have skilled professional skill.

The high-precision machining of the shallow groove of the part by one-time feeding of the radial size of the end mill is a shortcut for improving the high efficiency of notch machining, and the milling cutter ground by the grinding machine cannot meet the requirement of the part machining of the high-precision notch and usually needs to be ground by an operator.

The static grinding method has the defects that the radial runout of a milling machine is not determined in advance, the grinding amount of each cutting edge cannot be determined, the consistency of the cutting edge back angle cannot be maintained, the grinding precision of the radial dimension of the milling cutter is uncertain, and the cutter durability is poor.

The invention content is as follows:

in order to solve the technical problems, the invention provides a radial precision grinding method for a spiral milling cutter, which can enable the milling cutter to finish the high-precision notch processing of parts by one-time feeding on a milling machine, has stable processing quality, high surface roughness and simple operation and is suitable for the high-precision notch milling processing of large-batch parts.

The invention relates to a radial precision grinding method of a spiral milling cutter, which comprises the following steps:

a. selecting the diameter of a milling cutter close to the size of a notch of a part, wherein the number of teeth of the milling cutter is three or four;

b. installing a milling cutter on a main shaft of a machine tool, and coloring the rear angle of each cutting edge;

c. the main shaft is rotated to the left, and the notch trial cutting of the semi-finished part is finished by one-time feeding;

d. detecting the size of a notch of the part, and determining the radial grinding amount of the milling cutter;

e. checking the coloring state of each blade and determining the grinding sequence of each blade;

f. rotating the main shaft to the right at the rotating speed of 30r/min, and grinding uncolored blades or grinding the uncolored blades in sequence;

g. grinding the rear angle of the milling cutter by adopting green silicon carbide oilstone, wherein the green silicon carbide oilstone needs to be soaked by kerosene, and the oilstone is dipped in the machine oil during grinding;

h. grinding oilstone clings to the rear angle surface of the cutting edge and extends from the upper end of the cutting edge to the lower end of the cutting edge along the cutting edge helical angle, so that the rear angle of the cutting edge is kept unchanged;

i. trial cutting and repeating the steps b-h until the radial precision of the milling cutter meets the size of the notch of the part;

j. after grinding, the spindle is turned left, and aluminum scrap is used for lightly scraping from the lower end of the cutting edge to the upper end of the cutting edge at each cutting edge along the cutting edge helix angle.

The method for grinding the radial precision of the spiral milling cutter changes the traditional milling cutter static precision grinding mode, realizes the adjustment of the radial working precision of the milling cutter, can finish the high-precision notch processing of parts by one-time feeding, improves the notch milling production efficiency of the parts, has stable processing quality and simple operation, and is suitable for the high-precision notch milling processing of large-batch parts.

Drawings

FIG. 1 is a schematic view of a helical milling cutter;

in the figure: 1. a first blade; 2. a second blade; 3. a third blade; 4. a fourth blade; 5. a milling cutter body; 6. the upper end of the blade; 7. the lower end of the cutting edge.

Detailed Description

Referring to fig. 1, the method for grinding the radial precision of the spiral milling cutter of the invention comprises the following grinding steps:

a. selecting the diameter of a milling cutter close to the size of a notch of a part, wherein the number of teeth of the milling cutter is four;

b. installing a milling cutter body 5 on a main shaft of a machine tool, coloring each cutting edge back angle, and respectively marking a first cutting edge 1, a second cutting edge 2, a third cutting edge 3 and a fourth cutting edge 4 on the cutting edge back angle for distinguishing;

d. detecting the size of a notch of the part, wherein if the size of the notch is greater than 0.05mm under the technical condition, the radial total grinding amount of the milling cutter is 0.05 mm;

e. checking the coloring state of each blade, wherein the larger the coloring disappearance width of the edge at the rear angle of the blade is, the first blade is ground, so that the grinding sequence of each blade is determined, and the blade is not ground when the coloring is unchanged;

f. rotating the main shaft to the right at the rotating speed of 30r/min, grinding uncolored blades in sequence, and reducing the blade grinding amount from maximum to minimum in the blade grinding sequence;

g. grinding the rear angle of the milling cutter by adopting green silicon carbide oilstone, wherein the green silicon carbide oilstone needs to be soaked by kerosene for more than 24 hours, and the oilstone is dipped with engine oil during grinding;

h. the hand-held grinding oilstone clings to the rear angle surface of the cutting edge and extends from the upper end 6 of the cutting edge to the lower end 7 of the cutting edge along the cutting edge helical angle, so that the pressure is kept uniform, and the rear angle of the cutting edge is kept unchanged;

i. trial cutting is carried out again, and the steps b-h are repeated until the radial precision of the milling cutter meets the size of the notch of the part;

j. after grinding, the spindle is turned left, and aluminum scrap is used for lightly scraping from the lower edge 7 to the upper edge 6 of each blade along the blade helix angle to eliminate microscopic saw teeth on the blades.

Claims

1. A radial precision grinding method for a spiral milling cutter is characterized by comprising the following steps:

g. grinding the rear angle of the milling cutter by adopting green silicon carbide oilstone, wherein the green silicon carbide oilstone needs to be soaked by kerosene, and the oilstone is dipped with engine oil during grinding;