CN215698293U

CN215698293U - Multi-tooth-number three-edge insert milling cutter

Info

Publication number: CN215698293U
Application number: CN202121952540.1U
Authority: CN
Inventors: 张琳; 王洪亮; 张秀云
Original assignee: Shenyang Aircraft Industry Group Co Ltd
Current assignee: Shenyang Aircraft Industry Group Co Ltd
Priority date: 2021-08-19
Filing date: 2021-08-19
Publication date: 2022-02-01
Anticipated expiration: 2031-08-19

Abstract

The utility model provides a multi-tooth three-edge insert milling cutter, belonging to the field of mechanical manufacturing. The multi-tooth three-face-edge insert milling cutter comprises a cutter head, a cutter bar, a left cutter tooth and a right cutter tooth. The cutter head is embedded with a left cutter tooth and a right cutter tooth which are combined into a cutting part, and the cutter head and the cutter bar are welded into a whole; the cutter bar is used for transmitting the power of the main shaft to the cutter head; the left cutter tooth and the right cutter tooth are provided with cutter teeth, the cutter head is provided with a cutter groove, and the cutter teeth on the left cutter tooth and the right cutter tooth and the cutter groove of the cutter head are squeezed by the same insection to realize the embedded connection. Compared with the traditional T milling cutter, the large-diameter three-edge insert milling cutter saves expensive high-speed steel (or hard alloy), greatly improves the overall performance of the cutter by the heat treatment of a high-speed steel blade, and has the advantages that the number of cutter teeth of the milling cutter can be increased and the process manufacturing is more flexible.

Description

Multi-tooth-number three-edge insert milling cutter

Technical Field

The utility model creates a novel milling cutter embedded with cutter teeth and a process manufacturing method of the milling cutter, and is applied to the field of mechanical manufacturing.

Background

In the aviation part machining process, due to the special structure of an airplane part product, a deep cavity and inner profile groove type position exists on the part, the machining difficulty of a common milling cutter is extremely high, special milling cutters with different diameters can be designed for meeting the production requirements of airplane parts, when the diameter of the milling cutter is larger than phi 100mm, the traditional integral structure and the welding blade structure are not ideal in the aspects of economy and manufacturability of cutter manufacturing, and the production efficiency is low.

SUMMERY OF THE UTILITY MODEL

The purpose of the utility model is as follows: because the aircraft has some special structural components, because of the production condition restriction, need to carry out processing with T type milling cutter. The diameter of the T-shaped milling cutter on the market is below 50, so that the use requirement cannot be met.

The technical scheme of the utility model is as follows:

a multi-tooth-number three-edge insert milling cutter comprises a cutter head 1, a cutter bar 2, a left cutter tooth 3 and a right cutter tooth 4. The cutter head 1 is embedded with a left cutter tooth 3 and a right cutter tooth 4 which are combined into a cutting part, and the cutter head 1 and the cutter bar 2 are welded into a whole; the cutter bar 2 is used for transmitting the power of the main shaft to the cutter head 1; the left cutter tooth 3 and the right cutter tooth 4 are provided with cutter teeth, the cutter head 1 is provided with a cutter groove, and the cutter teeth on the left cutter tooth 3 and the right cutter tooth 4 and the cutter groove of the cutter head 1 are squeezed by the same insections to realize the embedded connection.

The cutter groove is isosceles trapezoid, the tooth pattern on the cutter groove has 90-degree tooth shape, the space is 1.5, the bottom of the cutter groove is designed with a horseshoe-shaped hollow cutter, the hollow cutter in the groove enables a gap to be reserved between the cutter blade and the bottom of the cutter groove, the cutter is convenient to manufacture and install, a circumferential chip breaking groove is designed on the circumference of the cutter head and is convenient for chip breaking, and the size of the circumferential chip breaking groove is determined by the diameter and the number of teeth of the milling cutter.

The cutter teeth, the cutter head and the cutter bar can be made of different materials with different hardness, so that the cutter teeth are more reasonable to manufacture and convenient to replace. Determining parameters such as material grade, geometric dimension, form and position tolerance, surface roughness, heat treatment mode and matching form of components during assembly, and performing prescribed carding on the manufacturing process of the cutter head, the cutter bar and the cutter blade.

The utility model has the beneficial effects that:

compared with the traditional T milling cutter, the large-diameter three-edge insert milling cutter saves expensive high-speed steel (or hard alloy), greatly improves the overall performance of the cutter by the heat treatment of a high-speed steel blade, and has the advantages that the number of cutter teeth of the milling cutter can be increased and the process manufacturing is more flexible. Meanwhile, more reasonable and efficient process construction steps and methods are created according to actual production needs, so that the cost of the cutter product is saved, and the production efficiency is improved. The novel milling cutter product is processed in a split mode, and a cutter head, a cutter bar and a cutter blade are manufactured independently; the product assembly adopts the methods of inlaying and welding for combination and connection.

Description of the drawings:

fig. 1 is a front view of a three-sided insert milling cutter assembly.

Fig. 2 is a side view of a three-sided insert milling cutter assembly.

FIG. 3 is a view showing the structure of a cutter head of a three-sided insert milling cutter, wherein (a) is a front view, and (B) is a side view, and (c) is a sectional view taken along line A-A, and (d) is a sectional view taken along line B-B.

Fig. 4 is a view showing a structure of a holder of a three-sided insert milling cutter.

FIG. 5 is a view showing the structure of a left cutter tooth, wherein (a) is a front view of the cutter tooth, (b) is a left view of the cutter tooth, (c) is a sectional view of the cutter tooth at a rounded corner, (d) is a top view of the cutter tooth, and (e) is a sectional view of the tooth pattern of the cutter tooth.

FIG. 6 is a view showing the structure of a right cutter tooth, wherein (a) is a front view of the cutter tooth, (b) is a left view of the cutter tooth, (c) is a sectional view of the cutter tooth at a rounded corner, (d) is a top view of the cutter tooth, and (e) is a sectional view of the tooth pattern of the cutter tooth.

In the figure: 1, a cutter head; 2, a cutter bar; 3, left cutter teeth; 4 right cutter teeth.

Detailed Description

The technical solution of the present invention is further explained below with reference to the examples and the drawings.

(1) Fig. 1 is a schematic view of a three-sided insert milling cutter assembly: a cutter head 1; a cutter bar 2; a left cutter tooth 3; a right cutter tooth 4; the key technology is that the milling cutter with high-speed steel insert usually adopts the insection fit, the insert is a rake face ground before assembly, and the rake angle is ensured by the sizes a and h on the cutter body groove after assembly. After the assembly is finished, the jumping tolerance of the excircle of the cutting edge relative to the reference plane of the cutter rod is required to be within a specified range, and meanwhile, the whole surface of the cutter is ensured to be intact without damage.

The processing technology steps after the assembly of the three-edge insert milling cutter are as follows:

leveling: grinding a large sheet of 5-degree blank keeping excircle with the tooth pattern surface as a reference, keeping the blank allowance of 1-3 and the blank allowance of 0.5-1.5, and symmetrically assembling and tightening.

And (3) outside: grinding the excircle to the size according to the drawing and keeping the excircle vertical to one end face of the plain edge part.

Leveling: and grinding two planes of the edge part by taking the smooth surface as a reference until the size of the edge part keeps the extension of the blades on two sides.

Cutting edge: grinding R and each section back angle, and grinding the centripetal angle maintaining plane part.

(2) Fig. 3 is a cutter head structure view of a three-edge insert milling cutter. The cutter head 1 is divided into a cutter body and a joint: the position of the cutter body groove needs to be calculated according to the requirement of the front angle of the milling cutter. The milling cutter adopts a staggered equal-division tooth groove and is provided with a groove hollow cutter and a circumferential chip removal groove; the end surface of the joint part has high finish, and is used for butt welding process steps, and the diameter of the outer circle is selected according to requirements.

The manufacturing process of the three-edge insert milling cutter head comprises the following steps:

turning: and the residual grinding amount of the inner hole after turning is 0.35-0.45 of the thickness of the residual grinding gauge plug gauge.

Milling: milling the left and right staggered equant tooth grooves by using a 5-degree milling cutter according to the figure and detecting by using a 5-degree gauge.

Milling: the milling cutter groove is hollow.

Inserting: the 5 ° retention of the slotting was checked with an insection gauge.

Milling: and (5) milling a circumferential chip removing groove.

Clamping: and (4) deburring, namely filing a chip groove at the R part.

Heating: and (5) quenching and tempering HRC 33-48.

Blowing: and (6) blowing sand.

Table: and (4) surface oxidation.

Leveling: and grinding the other surface by taking the smooth surface as a reference until the size keeps the two end surfaces parallel and vertical to the axis for demagnetization.

(3) Fig. 4 is a view showing a structure of a holder of a three-sided insert milling cutter. The cutter arbor 2 is divided into joint and caudal peduncle: the end surface of the joint part has high finish, and is used for butt welding process steps, and the diameter of the excircle is selected according to the requirements of No. 1 cutter heads. The structure of the tail handle can be selected according to the condition of a machine tool clamp.

The manufacturing process of the three-edge insert milling cutter bar comprises the following steps:

turning: and the axle is provided with a threaded bottom hole at the tail part.

Turning: and tapping tail threads to size.

Turning: the residual grinding amount of the tail cone is 0.4-0.5, and the rest is the size.

Clamping: and (4) deburring.

Heating: and (5) quenching and tempering HRC 33-48.

Blowing: and (6) blowing sand.

Table: and (4) surface oxidation.

Clamping: grinding a central hole and polishing a screw thread.

And (3) outside: grinding the outer circle of the Morse cone to the size, wherein the tightness of the Morse cone detected by a sleeve gauge is not more than 90%.

(4) Fig. 5 is a left insert structure view of a three-edge insert milling cutter. FIG. 5 is a view showing the structure of the right cutter tooth. The cutter teeth are provided with insection structures, and the front angle and the rear angle are reasonably selected according to requirements.

The manufacturing process steps of the left and right blades of the three-edge insert milling cutter are as follows:

planing: and (4) planing the width according to the direction of the forge piece, and reserving the allowance of 0.8-1 according to the thickness of the clamping plate.

Milling: milling back angle 30 deg. keeps the margin uniform 0.25.

Planing: planing at 5 degrees and checking by using a 5-degree clamping plate.

Milling: cut into single pieces according to the width inclination of 15 degrees and pay attention to the left and right quantity.

Milling: and (5) milling the gear pattern by using a hobbing cutter, and inspecting according to a clamping plate.

Clamping: and drawing R and angle lines.

Milling: milling a back angle of 30 degrees and a chamfer angle of 30 degrees when milling 0.6R multiplied by 45 degrees at the position R.

Clamping: a deburring file R and a relief angle.

Leveling: repeatedly grinding a 5-degree surface by taking the insection as a reference and keeping the allowance of 0.3 tooth point on the insection surface to be 0.15-0.3 plane.

Heating: and (5) quenching and tempering HRC 63-66.

Blowing: and (6) blowing sand.

Table: and (4) surface oxidation.

(5) Selecting materials of components of the three-edge insert milling cutter: the cutter head 1 and the cutter bar 2 are made of carbon structural steel No. 45 or 40Cr, and the quenching hardness of the cutter body is HRC 33-48; the left cutter tooth 3 and the right cutter tooth 4 are made of high-speed steel W18Cr4V, and the quenching hardness of the cutter teeth is HRC 63-66.

(6) Technical conditions of the insert milling cutter are as follows: the front, back, end face and inner hole surface of the surface finish cutter tooth of the milling cutter are not lower than 7 grades, and the supporting surface of the cutter body groove and the supporting surface behind the cutter tooth are not lower than 5 grades; the pitch tolerance is + -0.03 mm within 20 pitches.

Claims

1. The multi-tooth-number three-edge insert milling cutter is characterized by comprising a cutter head (1), a cutter bar (2), a left cutter tooth (3) and a right cutter tooth (4); the cutter head (1) is embedded with a left cutter tooth (3) and a right cutter tooth (4) which are combined into a cutting part, and the cutter head (1) and the cutter bar (2) are welded into a whole; the cutter bar (2) is used for transmitting the power of the main shaft to the cutter head (1); the left cutter tooth (3) and the right cutter tooth (4) are provided with cutter teeth, the cutter head (1) is provided with a cutter groove, and the cutter teeth on the left cutter tooth (3) and the right cutter tooth (4) and the cutter groove of the cutter head (1) are squeezed by the same insections to realize embedded connection.

2. The multi-tooth three-sided insert milling cutter according to claim 1, wherein the pocket has an isosceles trapezoid shape, the tooth pattern of the pocket has a 90-degree tooth shape, and the pitch is 1.5.

3. The multi-tooth, three-sided insert milling cutter according to claim 1, wherein the bottom of the pocket is designed with a horseshoe-shaped hollow cutter, the hollow cutter in the pocket leaving a gap from the insert to the bottom of the pocket; the circumference of the cutter head is provided with a circumferential chip breaker groove.