CN211387076U - High-efficient branch bits milling cutter that can be used to deep hole reaming processing - Google Patents

Abstract

The utility model discloses a high-efficiency chip dividing milling cutter which can be used for deep hole reaming processing, and belongs to the technical field of milling cutters. The high-efficiency chip splitting milling cutter of the utility model comprises a shank and a cutting part, the cutting part has 4-12 spiral cutting edges distributed in the circumferential direction, the cutting edges have an unequal structure in the circumferential direction, and two adjacent cutting edges The difference between the maximum value and the minimum value of the included angle between the end edges of the blades is 3.5° to 9°; each cutting edge is provided with a number of chip splitting grooves at an axial interval, and the chip splitting grooves on each cutting edge are staggered from each other in the axial direction. The high-efficiency chip splitting milling cutter of the utility model adopts the unequal splitting design combined with the staggered tooth design of the chip splitting groove, which effectively reduces the vibration during the processing of the chip splitting milling cutter, is beneficial to the cutting force, and improves the machining accuracy and machining accuracy. High efficiency, can be used for deep hole reaming, deep shoulder milling and deep groove milling, etc., and the chip size is controllable, it can form fine chips, and it is more perfect for parts with special requirements for chip formation.

Description

A high-efficiency chip splitting cutter for deep hole reaming

technical field

The utility model relates to a milling cutter, in particular to a high-efficiency chip dividing milling cutter which can be used for deep hole reaming processing.

Background technique

A milling cutter is a rotary tool with one or more cutter teeth for milling, and each cutter tooth intermittently cuts off the allowance of the workpiece during operation. Milling cutters are mainly used for machining planes, steps, grooves, forming surfaces and cutting workpieces on milling machines. According to different processing characteristics, the common product types of milling cutters are cylindrical milling cutters, face milling cutters, end milling cutters, three-sided milling cutters, angle milling cutters, saw blade milling cutters and T-shaped milling cutters.

A milling cutter that can be used for hole reaming can be called a hole reaming cutter. Its structure generally includes a tool holder and a hole reaming milling part. Generally, the workpiece is side-milled by the hole reaming and milling part. Chips are usually long, long chips are difficult to remove, and they are easy to scratch the surface of the processed product, resulting in poor surface roughness, and long chips are difficult to clean. hole machining. Chinese patent application No. 201310567409.7, the application publication date is February 12, 2014, and the name of the invention is: A chip-breaking end mill. The application relates to a chip-breaking end mill, including a shank and a The cutter head is provided with a side cutting edge and a bottom cutting edge, the side cutting edge includes two cutting edges and two corrugated cutting edges, the cutting edge and the corrugated cutting edge are arranged at intervals, and a The helical side chip flutes, the helix angle is 40°±2°, the width of the cutting edge and the corrugated cutting edge is 20±1mm, the inclination angle is 3°-5°, and the bottom cutting edge is provided with four pieces. Bottom chip flutes are provided between adjacent bottom cutting edges. The patent application adopts the combined design of the cutting edge and the corrugated cutting edge to realize the chip separation effect of the milling cutter, which has a certain chip separation effect, but the combined design of the cutting edge and the corrugated cutting edge also makes it difficult to further improve the milling efficiency and machining accuracy of the milling cutter .

Milling cutters whose cutting edges are all corrugated structures are usually called corn milling cutters, and corn milling cutters are generally used for side milling and roughing. The outer surface of the double-end wave-edged corn milling cutter is provided with circumferential teeth, and the cutting edge of the circumferential teeth is provided with a double-end wave-edged chip splitter. This type of corn milling cutter also has a good chip separation effect, but it cannot be used for deep hole reaming milling, and can only be used for rough machining.

SUMMARY OF THE INVENTION

1. Technical problems to be solved by the utility model

The purpose of the utility model is to overcome the shortcomings of the existing chip splitting milling cutters such as low machining accuracy and machining efficiency, and difficulty in high-precision machining of deep holes or deep grooves, and provide a high-efficiency machine that can be used for deep hole reaming machining. The chip-separating milling cutter adopts the technical scheme of the present utility model. The high-efficiency chip-separating milling cutter adopts an unequal division structure design, and the difference between the maximum value and the minimum value of the included angle between the end edges of two adjacent cutting edges is 3.5° ～9°, and each cutting edge is provided with a number of chip splitters at intervals along the axial direction, and the chip splitters on each cutting edge are staggered from each other in the axial direction, and the unequal design combines the staggered chip splitter. The tooth design effectively reduces the vibration during the processing of the chip milling cutter, which is beneficial to the cutting force, and improves the processing accuracy and processing efficiency. It can be used for deep hole reaming, deep shoulder milling and deep slot milling, etc., and The chip size is controllable and can form fine chips for easy chip cleaning.

2. Technical solutions

In order to achieve the above object, the technical scheme provided by the present utility model is:

The utility model is a high-efficiency chip-separating milling cutter which can be used for deep hole reaming, comprising a tool holder and a cutting portion arranged at the front of the tool holder, wherein the cutting portion has 4 to 12 circumferentially distributed spirals The cutting edge has a spiral groove between two adjacent cutting edges, and each cutting edge has an end edge arranged on the end face of the milling cutter and a peripheral edge arranged in the circumferential direction of the milling cutter. It has an unequal division structure in the circumferential direction. On the end face of the high-efficiency chip milling cutter, the difference between the maximum value and the minimum value of the included angle between the end edges of two adjacent cutting edges is 3.5° to 9°; The cutting edges are provided with a number of chip splitting grooves at intervals along the axial direction, and the chip splitting grooves on each cutting edge are staggered from each other in the axial direction.

Furthermore, at least one pair of the included angle values between the end edges of two adjacent cutting edges is a decimal.

Furthermore, the said chip splitting groove is opened on the cutting edge along the circumferential direction of the high-efficiency chip splitting milling cutter.

Further, the cross-sectional shape of the chip splitter is rectangular.

Further, the edge length dimension L3 between two adjacent chip-dividing grooves on each cutting edge is determined according to the size of the chips.

Further, the width L4 of the chip splitting groove is 0.5-1.5 mm.

Further, the ratio of the length L2 of the cutting portion to the diameter D1 of the cutting portion is greater than or equal to 3.

Further, the number of edges of the cutting part is determined according to the diameter D1 of the cutting part. When the diameter D1 of the cutting part is 6-12 mm, the cutting part has 4-5 cutting edges; when the diameter D1 of the cutting part is greater than At 12 mm, the cutting portion has 6 to 12 cutting edges.

Further, the end of each of the cutting edges has a front chamfer, and the front chamfer is 45°.

Further, the peripheral edge of the cutting edge adopts a double relief angle design, and the double relief angle is 12°-24°; the end edge relief angle of the cutting edge is 10°-23°.

3. Beneficial effects

Using the technical solution provided by the present utility model, compared with the existing known technology, has the following remarkable effects:

(1) A high-efficiency chip-separating milling cutter that can be used for deep hole reaming of the present invention has 4 to 12 circumferentially distributed helical cutting edges in its cutting portion, and each cutting edge has a The end edge on the end face and the peripheral edge arranged in the circumferential direction of the milling cutter, the cutting edge has an unequal structure in the circumferential direction, and the difference between the maximum and minimum angle between the end edges of two adjacent cutting edges is From 3.5° to 9°, each cutting edge is provided with a number of chip splitting grooves at intervals along the axial direction, and the chip splitting grooves on each cutting edge are staggered in the axial direction; the high-efficiency chip splitting milling cutter passes through the cutting edge. The unequal split design combined with the staggered tooth design of the chip splitter, the unequal split design of the cutting edge can effectively reduce the vibration during the processing of the chip splitter milling cutter, and the staggered tooth design of the chip splitter is beneficial to the cutting force and greatly improves the machining process. Compared with the existing milling cutter, the precision and processing efficiency can be used for deep hole reaming, deep shoulder milling and deep groove milling, etc., and the chip size is controllable, which can form fine chips and facilitate chip cleaning;

(2) In a high-efficiency chip splitting milling cutter of the present invention that can be used for deep hole reaming, at least one pair of the included angle values between the end edges of two adjacent cutting edges is a decimal. The unequal division design of each cutting edge makes the cutting vibration frequency of each cutting edge different, further reduces the resonance of each cutting edge during the cutting process, ensures the accuracy of milling processing, can be processed at a higher cutting speed, and improves the processing efficiency;

(3) A kind of high-efficiency chip-separating milling cutter of the present invention that can be used for deep hole reaming processing, the chip-separating groove is opened on the cutting edge along the circumferential direction of the high-efficiency chip-separating milling cutter, and the cross-sectional shape of the chip-separating groove is The rectangular shape is not only convenient for the processing of chip grooves, but also more convenient for chip breaking, making the chips smaller, especially for the cleaning of chips in deep holes or deep grooves;

(4) According to a high-efficiency chip splitting milling cutter of the present invention that can be used for deep hole reaming, the edge length dimension L3 between two adjacent chip splitting grooves on each cutting edge is determined according to the size of the chips, and the The width L4 of the chip groove is designed to be 0.5~1.5mm, and the length of the peripheral edge of the tool can be flexibly designed according to the processing needs, which is beneficial to improve the service life of the tool;

(5) A high-efficiency chip milling cutter of the present invention that can be used for deep hole reaming, the ratio of the length L2 of the cutting portion to the diameter D1 of the cutting portion is greater than or equal to 3, and the number of cutting edges of the cutting portion is based on the cutting portion. It depends on the diameter D1, and can be used for deep hole expansion processing.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of a kind of high-efficiency chip splitting milling cutter that can be used for deep hole reaming according to the present invention;

Fig. 2 is the partial enlarged structure schematic diagram of K place in Fig. 1;

3 is a schematic side view of the structure of a high-efficiency chip splitting milling cutter that can be used for deep hole reaming according to the present invention;

FIG. 4 is a schematic diagram of the unequal division design structure of a high-efficiency chip splitting milling cutter that can be used for deep hole reaming according to the present invention.

Description of the labels in the diagram:

1. Shank; 2. Cutting part; 2-1, Cutting edge; 2-2, Spiral groove; 2-3, End edge; 2-4, Chip splitter; 2-5, Front chamfer.

Detailed ways

In order to further understand the content of the present utility model, the present utility model is described in detail with reference to the accompanying drawings.

1 to 4, a high-efficiency chip milling cutter that can be used for deep hole reaming processing of the present invention includes a tool holder 1 and a cutting portion 2 arranged at the front of the tool holder 1. The cutting portion 2 has 4 to 12 spiral cutting edges 2-1 distributed in the circumferential direction, the number of cutting edges of the cutting part 2 can be determined according to the diameter D1 of the cutting part 2, in this utility model, when the diameter D1 of the cutting part 2 is 6～12mm When the diameter D1 of the cutting part 2 is greater than 12mm, the cutting part 2 has 6-12 cutting edges 2-1, That is, the design of six-blade or seven-blade or eight-blade is adopted. There is a helical groove 2-2 between two adjacent cutting edges 2-1, the helical groove 2-2 is used for chip storage and chip removal, and each cutting edge 2-1 has an end edge 2 arranged on the end face of the milling cutter -3 and the peripheral edge arranged in the circumferential direction of the milling cutter, the cutting edge 2-1 of the high-efficiency chip-breaking milling cutter has an unequal division structure in the circumferential direction, and on the end face of the high-efficiency chip-breaking milling cutter, two adjacent cutting edges The difference between the maximum value and the minimum value of the included angle between the end edges 2-3 of the cutting edge 2-1 is 3.5°～9°, and each included angle is not equal. The above-mentioned unequal cutting edge design can effectively reduce the cutting edge. At the same time, each cutting edge 2-1 is provided with a number of chip splitting grooves 2-4 at intervals along the axial direction, and the chip splitting grooves 2-4 on each cutting edge 2-1 Offset from each other in the axial direction, the chip splitter 2-4 breaks the peripheral edge of each cutting edge 2-1, and forms a concave-convex serrated structure on the surface. The staggered tooth design of the chip splitter is conducive to the cutting force, and The chip can be cut off to form fine chips, and the unequal design of the cutting edge and the staggered tooth design of the chip groove are combined, which greatly improves the machining accuracy and machining efficiency. The high-efficiency chip-separating milling cutter of the present invention, which can be used for deep hole reaming processing, is similar in appearance to a corn milling cutter with a corrugated cutting edge. End edge and peripheral edge, with unequally designed cutting edge and staggered tooth design chip splitter, the processing application is more extensive, can be used for deep hole reaming, deep shoulder milling and deep slot milling, etc., and the chip The size is controllable, and it can form fine chips, which is convenient for chip cleaning; and can be used for roughing and finishing, and the surface roughness Ra≤0.8.

For the above-mentioned unequal design of cutting edges, preferably, at least one pair of the included angle values between the end edges 2-3 of two adjacent cutting edges 2-1 is a decimal number, for example, at least one pair of included angles has a "Half-degree" angle, experiments show that the use of this unequal design makes the cutting vibration frequency of each cutting edge different, further reduces the resonance of each cutting edge during the cutting process, ensures the accuracy of milling, and can be used with higher high cutting speed for processing, which improves the processing efficiency.

In addition, as shown in FIG. 3, in the present invention, the above-mentioned chip splitter 2-4 is opened on the cutting edge 2-1 along the circumferential direction of the high-efficiency chip splitter, that is, the chip splitter 2-4 is located on the cutting edge. 2-1 is arc-shaped, and the chip splitter 2-4 is perpendicular to the axial direction of the high-efficiency chip splitter milling cutter, and the cross-sectional shape of the chip splitter 2-4 is preferably a rectangle, which is not only convenient for the chip splitter 2-4 It is more convenient for chip breaking, making the chips smaller, especially for the cleaning of chips in deep holes or deep grooves. The edge length dimension L3 between the adjacent two chip splitting grooves 2-4 on each cutting edge 2-1 can be determined according to the size of the chips, and the smaller the edge length dimension L3 is, the shorter the chip length is. The width L4 of the chip splitter 2-4 can be designed to be 0.5-1.5mm, and the chip splitter 2-4 can be formed by relief grinding.

In the present invention, the ratio of the length L2 of the cutting portion 2 to the diameter D1 of the cutting portion 2 is greater than or equal to 3, which is especially suitable for the machining of deep holes or deep grooves with a diameter of 3 times or more. The ratio of the diameter D1 of the portion 2 is preferably designed to be 5 to 8 times. As shown in FIG. 2 , the end of each cutting edge 2-1 has a front chamfer 2-5, and the front chamfer 2-5 is 45°. The peripheral edge of the cutting edge 2-1 adopts a double relief angle design, and the double relief angle is 12°～24°; the end edge 2-3 of the cutting edge 2-1 has a relief angle of 10°～23°.

The present utility model will be further described below in conjunction with the embodiments.

Example

In this embodiment, the four-blade high-efficiency chip-breaking milling cutter shown in FIGS. 1 to 4 is used as an example to further illustrate the design principle of a high-efficiency chip-breaking milling cutter of the present invention that can be used for deep hole reaming. In this embodiment, the high-efficiency chip splitting milling cutter includes a shank 1 and a cutting portion 2 integrally provided at the front of the shank 1. The cutting portion 2 has four circumferentially distributed helical cutting edges 2-1, adjacent to each other. There is a spiral groove 2-2 for chip removal between the two cutting edges 2-1. The peripheral edge, the end edge 2-3 and the peripheral edge all have relief angles. Different from the existing milling cutter, the cutting edge 2-1 of the high-efficiency chip-breaking milling cutter has an unequal division structure in the circumferential direction, and the unequal division structure of the cutting edge 2-1 is designed as follows: The difference between the maximum value and the minimum value of the included angle between the end edges 2-3 of the two adjacent cutting edges 2-1 is 3.5°～9°, and each included angle is not equal. At least one pair of the included angle values between the end edges 2-3 of the two cutting edges 2-1 is a decimal number, for example, at least one pair of the included angles is a "half degree" angle, as shown in Figure 4, in the four In the cutting edge 2-1, the included angles between the two adjacent cutting edges 2-1 are 91°, 93°, 88.5° and 87.5° respectively, two of which have 0.5°, and the maximum value of the included angle is the same as that of the cutting edge 2-1. The difference between the minimum values is 5.5°. Experiments show that the unequal division design makes the cutting vibration frequency of each cutting edge 2-1 different, further reduces the resonance of each cutting edge during the cutting process, and ensures the accuracy of milling. It can be processed at a higher cutting speed, which improves the processing efficiency. On the basis of the unequal division design of the cutting edges 2-1, each cutting edge 2-1 also has a chip splitter 2-4 with a staggered tooth design, and a chip splitter 2-4 on each cutting edge 2-1 They are staggered in the axial direction, and the chip splitter 2-4 breaks the peripheral edge of each cutting edge 2-1. During machining, the peripheral edge length is used for milling, and the chip splitter 2-4 breaks the chips. Small chips are formed, and the staggered tooth design of the chip splitter 2-4 is beneficial to the cutting force, reduces the cutting resistance, facilitates the improvement of processing efficiency, and can realize one-time hole forming processing of deep holes. In addition, in the above-mentioned unequal division design, the helix angles corresponding to the cutting edges 2-1 can also be designed to be inconsistent. The helix angles of 35° and 36°, that is, the helix angles of the four cutting edges 2-1 are 35°, 36°, 35° and 36° in turn.

Referring to Figures 1, 2 and 3, in this embodiment, the above-mentioned chip splitter 2-4 is opened on the cutting edge 2-1 along the circumferential direction of the high-efficiency chip splitter, namely the chip splitter 2- 4. The cutting edge 2-1 is arc-shaped, and the chip separation groove 2-4 is perpendicular to the axial direction of the high-efficiency chip separation milling cutter, and the cross-sectional shape of the chip separation groove 2-4 is preferably rectangular, which is not only convenient for chip separation The processing of grooves 2-4 is more convenient for chip breaking, making the chips smaller, especially for cleaning chips in deep holes or deep grooves. The edge length dimension L3 between two adjacent chip splitter grooves 2-4 on each cutting edge 2-1 can be determined according to the size of the chips. The smaller the edge length dimension L3 is, the shorter the chip length is. The edge length L3 between the chip flutes 2-4 can be designed to be 3.5mm, the width L4 of the chip flutes 2-4 can be designed to be 1mm, and a concave-convex serrated structure is formed on the peripheral edge of the cutting edge 2-1. The four-blade high-efficiency chip splitting cutter of this embodiment is especially suitable for deep hole or deep groove machining. Therefore, the ratio of the length L2 of the cutting portion 2 to the diameter D1 of the cutting portion 2 is generally designed to be greater than or equal to 3. The ratio of the length L2 to the diameter D1 of the cutting portion 2 is preferably designed to be 5 to 8 times. In order to increase the strength of the cutting portion 2 , the core thickness diameter D2 of the cutting portion 2 is preferably designed to be 0.6 times the diameter D1 of the cutting portion 2 . As shown in FIG. 2 , the end of each cutting edge 2-1 has a front chamfer 2-5, and the front chamfer 2-5 is preferably 0.1 mm×45°. The peripheral edge of the cutting edge 2-1 adopts a double relief angle design, and the double relief angle is preferably 12° to 24°, and the angle of the second peripheral edge relief angle is greater than the angle of the first peripheral edge relief angle; The relief angle of the end blade 2-3 is preferably 10° to 23°.

The high-efficiency chip-separating milling cutter of the utility model, which can be used for deep hole reaming processing, adopts an unequal division structure design, and the difference between the maximum value and the minimum value of the included angle between the end edges of two adjacent cutting edges is 3.5°～9°, and each cutting edge is provided with several chip splitters at intervals along the axial direction, and the chip splitters on each cutting edge are staggered from each other in the axial direction, and the unequal design combines the chip splitter The staggered tooth design effectively reduces the vibration during the processing of the chip milling cutter, which is beneficial to the cutting force, and improves the processing accuracy and processing efficiency. It can be used for deep hole reaming, deep shoulder milling and deep slot milling, etc. , and the chip size is controllable, which can form fine chips, which is convenient for chip cleaning, and is more perfect for parts with special requirements for chip formation.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which the present invention belongs. The terms used herein are for the purpose of describing specific embodiments only, and are not intended to limit the present invention.

The present invention and its embodiments have been described above schematically, and the description is not restrictive, and what is shown in the accompanying drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it, without departing from the purpose of creation of the present utility model, creatively design a structural mode and an embodiment similar to this technical solution, all should belong to the present utility model. protected range.

Claims (10)

1. A high-efficiency chip splitting milling cutter that can be used for deep hole reaming, comprising a tool holder (1) and a cutting portion (2) provided at the front of the tool holder (1), the cutting portion (2) having 4 to 12 helical cutting edges (2-1) distributed in the circumferential direction, a helical groove (2-2) is arranged between two adjacent cutting edges (2-1), and each cutting edge (2-1) is The utility model has an end edge (2-3) arranged on the end face of the milling cutter and a peripheral edge arranged in the circumferential direction of the milling cutter, and is characterized in that the cutting edge (2-1) of the high-efficiency chip splitting milling cutter has different diameters in the circumferential direction. Equally divided structure, on the end face of the high-efficiency chip splitting milling cutter, the difference between the maximum value and the minimum value of the angle between the end edges (2-3) of two adjacent cutting edges (2-1) is 3.5°～9 °; Each of the cutting edges (2-1) is provided with a number of chip splitting grooves (2-4) at intervals along the axial direction, and the chip splitting grooves (2-4) on each cutting edge (2-1) 4) staggered from each other in the axial direction. 2. A high-efficiency chip splitting milling cutter that can be used for deep hole reaming according to claim 1, characterized in that: between the end edges (2-3) of two adjacent cutting edges (2-1) At least one pair of the included angle values is a decimal. 3. A high-efficiency chip splitting milling cutter that can be used for deep hole reaming according to claim 1 or 2, characterized in that: the chip splitting groove (2-4) is at the cutting edge (2-1) The upper part is opened in the circumferential direction of the high-efficiency chip splitting cutter. 4 . The high-efficiency chip splitting milling cutter according to claim 3 , wherein the chip splitting groove ( 2 - 4 ) has a rectangular cross-sectional shape. 5 . 5. A high-efficiency chip splitting milling cutter that can be used for deep hole reaming according to claim 4, characterized in that: two adjacent chip splitting grooves (2-4) on each cutting edge (2-1) ) between the edge length dimension L3 depends on the chip size. 6 . The high-efficiency chip splitting milling cutter according to claim 5 , wherein the chip splitting groove ( 2 - 4 ) has a width L4 of 0.5-1.5 mm. 7 . 7. A high-efficiency chip milling cutter that can be used for deep hole reaming according to claim 1 or 2, characterized in that: the length L2 of the cutting portion (2) and the diameter of the cutting portion (2) The ratio of D1 is greater than or equal to 3. 8 . The high-efficiency chip splitting milling cutter that can be used for deep hole reaming according to claim 7 , wherein the number of cutting edges of the cutting portion ( 2 ) varies according to the diameter D1 of the cutting portion ( 2 ). 9 . It is determined that when the diameter D1 of the cutting portion (2) is 6 to 12 mm, the cutting portion (2) has 4 to 5 cutting edges (2-1); when the diameter D1 of the cutting portion (2) is greater than 12 mm, the cutting portion (2) has 4 to 5 cutting edges (2-1). (2) There are 6 to 12 cutting edges (2-1). 9 . The high-efficiency chip splitting milling cutter that can be used for deep hole reaming according to claim 8 , wherein the end of each of the cutting edges ( 2 - 1 ) has a front chamfer ( 9 . 2-5), the front chamfer (2-5) is 45°. 10. A high-efficiency chip splitting milling cutter that can be used for deep hole reaming according to claim 9, characterized in that: the peripheral edge of the cutting edge (2-1) adopts a double relief angle design, and the double relief angle is designed. The relief angle is 12°-24°; the relief angle of the end edge (2-3) of the cutting edge (2-1) is 10°-23°.

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