CN220144846U - Discrete edge end mill with variable chip dividing groove parameters - Google Patents

Abstract

The utility model discloses a discrete edge end mill with variable chip flute parameters, which is composed of a tool handle and a blade. The blade is composed of four peripheral blades and four end blades. There is a device on the flank surface of the peripheral blade. For chip dividers with changing parameters, the spacing between chip dividers is unequal, and the width of a single chip divider has a narrow front and wide rear structure. The peripheral cutting edge is divided into two categories according to the arrangement of the chip flutes on the peripheral cutting edge. The first type of peripheral cutting edge has chip flutes arranged from dense to sparse, and the second type of peripheral cutting edge has chip flutes arranged from sparse to dense. . The utility model has two adjacent peripheral edges of different types, which can change the spectrum characteristics of the end mill during milling and suppress vibration during the processing. A smaller number of chip grooves on the peripheral edges can ensure the processing accuracy of the workpiece. The chip groove with a narrow front and wide rear structure can reduce axial milling force, produce shorter chips, and improve the heat dissipation performance of the tool.

Description

A discrete edge end mill with variational chip flute parameters

Technical field

The utility model relates to the technical field of milling tools, in particular to a discrete edge end mill with variable chip flute parameters.

technical background

End mills are a commonly used processing tool for CNC machine tools. In recent years, with the continuous development and changes of science and technology, the requirements for component structures have become higher and higher, such as deep cavity types required in aerospace, new energy equipment and other fields. parts, the demand for such parts is growing day by day.

When using traditional end mills to process deep-cavity parts, the large axial depth of cut results in large cutting forces. The overhang of the end mills is long during processing, which makes them easy to vibrate during the processing. The chips generated are not easy to break and are prone to curling. Long chips, too long chips are difficult to discharge, and will also scratch the machined surface of the workpiece, resulting in reduced machining accuracy of the workpiece. Therefore, it is particularly important to design an end mill for processing deep cavity parts.

Utility model content

In order to solve the problems of excessively long chips and high cutting force that easily occur in the processing of existing deep-cavity parts, the utility model provides a discrete-edge end mill with variable chip flute parameters.

The technical solution provided by the utility model is: a discrete edge end mill with variable chip flute parameters. It is an integral end mill composed of a tool handle and a blade. The blade is composed of four peripheral edges. There are chip grooves on the flank surface of the blade, and the spacing between the chip grooves is unequal. The chip grooves are arranged in an alternating dense and dense manner on adjacent peripheral edges. The width of the chip grooves is narrow in front and wide in the back. .

Further, the overall size of the discrete edge end mill with variable chip flute parameters is 105mm, the diameter is 20mm, the core thickness H is 12mm, the blade length is 40mm, and the helix angle is 30°.

Further, the circumferential edge rake angle γ _z of the discrete edge end mill with variable chip flute parameters is 10°, the rake face width B ₁ is 2 mm, the circumferential edge first clearance angle α z1 is 10°, and the circumferential edge rake angle α _z1 is 10°. The width of the first flank surface of the edge B _az1 is 1.5mm, the second relief angle α _z2 of the peripheral edge is 15°, the width of the second flank surface of the peripheral edge B _az2 is 1.5mm, and the radius of the edge groove curve R ₁ is 2.53mm. , R ₂ is 7.12mm; the first relief angle α _d1 of the end edge is 10°, the width B _ad1 of the first flank surface of the end edge is 2mm, and the second relief angle α _d2 of the end edge is 15°.

Further, there are five chip flutes on the peripheral edge of the discrete-edge end mill with variable chip flute parameters. The distances between the chip flutes are unequal, and the spacing between the central axes of the chip flutes ranges from close to The sparse arrangement, the distance from left to right is: K ₁ = 4.2mm, K ₂ = 6.7mm, K ₃ = 8mm, K ₄ = 8.7mm; according to the arrangement of the chip grooves on the peripheral edge, the peripheral edge It is divided into two categories. In the first type, the chip grooves on the peripheral edge are arranged from dense to sparse. The distance between the chip groove closest to the end edge and the end edge is W ₁ = 7.7mm. In the second type, the chip grooves on the peripheral edge are arranged from dense to sparse. The chip flutes are arranged from sparse to dense. The distance between the chip flute closest to the end edge and the end edge is W ₂ =6mm, and the types of the two adjacent peripheral edges are different.

Further, the discrete edge end mill with variable chip flute parameters is characterized in that: the width of the chip flutes on the peripheral edge is different, the width of the front groove C ₁ =1.2mm, the depth is 1mm, and the width of the rear groove is 1mm. The width C ₂ =1.5mm, the depth is 1.3mm, and the shape of the chip divider is a spline curve. The spline curve is constrained by the endpoints on both sides of the groove width and the groove depth endpoints of the chip divider.

Beneficial effects of this utility model:

The chip-dividing grooves on the flank surface of the peripheral edge of this utility model are arranged in an alternating sparse and dense arrangement on adjacent peripheral edges, which changes the spectrum characteristics of the end mill during processing, suppresses vibration during the processing, and makes the peripheral edge smaller A small number of chip dividers can ensure the machining accuracy of the workpiece.

When designing the structure of the chip divider, the width of the chip divider is designed to be narrow at the front and wide at the back, so that when processing the workpiece, the workpiece left by the narrower chip divider edge at the front does not participate in the cutting area and will not interfere with the chip divider at the back. friction and interference.

The existence of chip splitting grooves reduces the axial milling force when processing the workpiece, facilitates chip breaking, avoids the generation of long curled chips, and improves the heat dissipation performance of the tool.

Description of the drawings

In order to more intuitively explain the technical solutions in the examples and technical requirements of the present invention, the following is an example diagram showing the technical requirements.

Figure 1 is an overall structural diagram of the utility model;

Figure 2 is a cross-sectional view of the blade taken at A-A in Figure 1;

Figure 3 is an enlarged view of the end blade of the utility model;

Figure 4 is an expanded view of the peripheral blade of the present utility model;

Figure 5 is a partial enlarged view of the chip separator of the present invention.

Figure 6 is a shape diagram of the chip separator of the present invention.

Reference symbols: 1. End edge; 2. Peripheral edge; 2-1. First type of circumferential edge; 2-2. Second type of circumferential edge; 3. Chip splitter; 4. Peripheral edge flank; 5. Blade; 6. Tool shank; 7. Endpoints on both sides of the groove width of the chip divider; 8. Endpoints of the groove depth of the chip divider.

Detailed ways:

The utility model will be further described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, an end mill with variable chip flute parameters includes a tool handle 1, a cutting edge 2, four peripheral cutting edges 3 and four end cutting edges 7. The overall size is 105mm, the diameter is 20mm, and the blade length is 105mm. is 40mm, and the helix angle is 30°.

As shown in Figures 2 and 3, the core thickness H is 12mm, the circumferential edge rake angle γ _z is 10°, the rake face width B ₁ is 2mm, the circumferential edge first relief angle α _z1 is 10°, and the circumferential edge first relief angle α z1 is 10°. The blade face width B _az1 is 1.5mm, the peripheral edge second flank angle α _z2 is 15°, the peripheral edge second flank width B _az2 is 1.5mm, the groove curve radius R ₁ of the edge 2 is 2.53mm, R ₂ is 7.12mm; the first relief angle α _d1 of the end edge is 10°, the first flank width B _{ad1 of} the end edge is 2mm, and the second relief angle α _d2 of the end edge is 15°.

As shown in Figure 4, a discrete-edge end mill with variable chip flute parameters has five chip flutes 3 on the peripheral edge 2. The distances between the chip flutes 3 are unequal, and the distance between the central axes of the chip flutes 3 is The spacing is arranged from dense to sparse, and the distances from left to right are:

K ₁ =4.2mm, K ₂ =6.7mm, K ₃ =8mm, K ₄ =8.7mm. The peripheral edge 2 is divided into two categories. In the first type, the chip grooves 3 on the peripheral edge 2-1 are arranged from dense to sparse. The distance between the chip groove 3 closest to the end edge 1 and the end edge 1 is W ₁ = 7.7 mm, the chip grooves 3 on the second type of peripheral edge 2-2 are arranged from sparse to dense, the distance between the chip groove 3 closest to the end edge 1 and the end edge 1 is W ₂ =6mm, and the distance between the two adjacent peripheral edges is Blade 2 has different types.

As shown in Figure 5, the chip dividing groove 3 is narrow in front and wide in the rear. The width of the front groove is C ₁ =1.2 mm and the depth is 1 mm. The width of the rear groove is C ₂ =1.5 mm and the depth is 1.3 mm. The shape of the chip dividing groove 3 is a spline curve, and the spline curve is constrained by the end points 7 on both sides of the groove width and the groove depth endpoint 8 of the chip dividing groove 3 .

The specific embodiments are only explanations of the present utility model, and they are not limitations of the present utility model. Those skilled in the art can make modifications to the present embodiments without creative contribution as needed after reading this description. However, as long as the present utility model is are protected by patent law within the scope of their claims.

Claims (3)

1. A variable flute parameter discrete edge end mill characterized by: including handle of a knife (6) and cutting part (5), cutting part (5) are by four week cutting edges (2) and four end cutting edges (1) are constituteed, are equipped with chip separating groove (3) on week cutting edge back knife face (4), and the distance between chip separating groove (3) is inequality, and chip separating groove (3) present the alternate arrangement mode of density on adjacent week cutting edge (2), and the width of chip separating groove (3) presents the structure of front and back width.

2. A variable flute parametric discrete edge end mill as claimed in claim 1, wherein: five chip-separating grooves (3) are formed in the peripheral edge (2), the distances among the chip-separating grooves (3) are unequal, the distance among central axes of the chip-separating grooves (3) is distributed densely to sparsely, and the distances are sequentially from left to right:K ₁ ＝4.2mm，K ₂ ＝6.7mm，K ₃ ＝8mm，K ₄ =8.7 mm; dividing the peripheral edge (2) into two types according to the arrangement mode of the chip-dividing grooves (3) on the peripheral edge (2), arranging the chip-dividing grooves (3) on the first peripheral edge (2-1) from dense to sparse, and enabling the chip-dividing groove (3) closest to the end edge (1) to be separated from the end edge (1) by the distance W ₁ =7.7 mm, the chip-separating grooves (3) on the second peripheral edge (2-2) are arranged from sparse to dense, the distance W between the chip-separating groove (3) closest to the end edge (1) and the end edge (1) ₂ =6mm, and the kinds of adjacent two peripheral edges (2) are different.

3. A variable flute parametric discrete edge end mill as claimed in claim 1, wherein: the chip dividing grooves (3) on the peripheral edge (2) have different widths, and the front groove has a width C ₁ =1.2 mm, depth 1mm, backset width C ₂ =1.5 mm, depth 1.3mm; the shape of the chip dividing groove (3) is spline curve, and the spline curve is formed by restraining groove width two side end points (7) and groove depth end points (8) of the chip dividing groove (3).