CN204893055U - Circular milling cutter piece - Google Patents

Abstract

The utility model provides a circular milling blade, which belongs to the technical field of processing tools. It solves the problems of short service life and low processing efficiency of existing milling inserts. The circular milling insert comprises a circular table-shaped insert body having a rake face, a rear end face and a insert side. The middle part of the insert body has a central hole arranged through it. The surface includes a first positive rake surface and a second positive rake surface arranged in sequence along the direction from the side to the center hole, the second positive rake surface extends to the annular plane at the center of the blade, the second positive rake surface and the annular plane The chipbreaker structure of the insert is formed through a circular arc surface transition connection, and the second positive rake surface is provided with space-avoiding grooves, and there are several space-avoiding grooves uniformly arranged along the central axis of the central hole. The utility model can deform, curl and break chips, and has the advantages of long service life and high processing efficiency.

Description

A round milling blade

technical field

The utility model belongs to the technical field of mechanical processing cutters, and relates to a circular milling blade, in particular to a circular milling blade with chip control performance.

Background technique

During the milling process, the cutting edge of the milling cutter cuts the surface of the workpiece to be processed, and the reaction force of the workpiece to the tool forms the cutting force. During the cutting process, the angle between the cutting edge and the cutting plane, that is, the main deflection angle, has a great influence on the radial cutting force and cutting width. The size of the radial cutting force directly affects the cutting power and the shock resistance of the tool. The smaller the entering angle of the milling cutter, the smaller the radial cutting force and the better the shock resistance, but the cutting width also decreases. Different from straight-edged inserts, round milling inserts have circular arc-shaped cutting edges, and the main deflection angle changes continuously from 0° to 90°. The pressure generated during processing mainly depends on the cutting width. The development of the geometric groove shape of the insert enables the circular milling insert to have a stable cutting effect, reduce the power requirement of the machine tool, and improve the processing stability. It is widely used in face milling and end milling.

When the workpiece is semi-finished or finished, the workpiece is required to achieve high dimensional accuracy and surface roughness. However, when the workpiece is milled, multiple blades are often involved in cutting at the same time, and the processing efficiency is high. There are many chips, but when ordinary circular milling cutters are processed, if the cutting parameters are large, short and small unit chips will be generated, and the chips will splash in disorder, impact the workpiece, tool, fixture, etc., affect the dimensional accuracy of the workpiece, and cause hidden dangers to operation safety ; If the cutting parameters are small, long circular spiral chips will be generated, which will easily scratch the workpiece and cause the surface quality of the workpiece to decline. In the machining process, the ideal chip type is similar to "C", "6" shaped chips or short spiral chips with a length of no more than 50mm, and the outflow of chips is required to be controllable.

Contents of the invention

The purpose of the utility model is to solve the above-mentioned problems in the existing technology, and propose a circular milling insert capable of producing ideal chip shapes and making the chips flow out in a direction.

The purpose of this utility model can be achieved through the following technical solutions:

The circular milling insert comprises a circular truncated insert body having a rake face, a bottom face of the insert, and a side face of the insert. The middle part of the insert body has a central hole arranged through it. The cutting edge, the rake face includes a first positive rake surface and a second positive rake surface arranged in sequence along the direction from the side edge to the central hole, and the second positive rake surface extends to the annular plane at the center of the insert At the position, the second positive rake surface and the annular plane are transitionally connected through an arc surface to form a chipbreaker structure of the insert. The second positive rake surface is provided with a space-avoiding groove, and the space-avoiding groove There are several and are evenly arranged along the central axis of the central hole. The unique avoidance groove structure can increase the heat dissipation area of the milling insert, reduce the friction area between chips and the milling insert, and allow the coolant to better enter the insert surface, which is beneficial to the lubrication and cooling of the cutting system. Moreover, the circular milling insert adopts a unique cutting edge structure, which is suitable for finishing or semi-finishing the workpiece material. It can cut off the blade material sharply, which can improve the dimensional accuracy and surface quality of the workpiece, and at the same time cooperate with the unique chip breaker The structure can better curl and break the chips, form ideal short spiral chips, and guide the chips to flow out in a direction.

In the above-mentioned circular milling insert, the relief groove extends into the annular plane at the center of the insert, and the relief groove gradually becomes wider and wider along the direction from the second positive rake surface to the annular plane. deep.

In the above-mentioned circular milling insert, there are 8-16 escaping grooves.

In the above-mentioned circular milling insert, there are 12 escaping grooves.

In the above-mentioned circular milling insert, the angle between the first positive rake surface and the plane perpendicular to the axis of the central hole is the first positive rake angle, and the first positive rake angle is 0°; The angle between the second positive rake surface and the plane perpendicular to the axis of the central hole is the second positive rake angle, and the second positive rake angle is 10°-20°.

In the aforementioned circular milling insert, the second positive rake angle is 16°.

In the above-mentioned circular milling insert, the edge width of the first positive rake surface along the second positive rake surface to the blade side is 0.1-0.15 mm; the annular plane to the first positive rake angle The vertical distance of the surface is 0.2-0.4mm.

In the above-mentioned circular milling insert, the edge width of the first positive rake surface is 0.12mm; the vertical distance from the annular plane to the first positive rake surface is 0.3mm.

In the above-mentioned circular milling insert, four side positioning planes arranged symmetrically along the central axis of the central hole are provided on the side of the insert close to the bottom of the insert, and the side positioning planes extend to the bottom of the insert and are aligned with the insert. Bottoms intersect. The flattened side positioning plane cooperates with the corresponding tool handle, which can make the positioning of the blade more accurate and stable. During the processing, it can reduce the risk of the blade loosening caused by the vibration of the circular milling blade during processing.

Compared with the prior art, the circular milling insert has the following advantages:

The unique avoidance groove is used to increase the heat dissipation area of the milling blade, reduce the friction area between chips and the milling blade, and make the coolant enter the surface of the blade better, which is beneficial to the lubrication and cooling of the cutting system; at the same time, the utility model The unique cutting edge structure can sharply remove the blade material, improve the dimensional accuracy and surface quality of the workpiece, and at the same time cooperate with the unique chipbreaker structure, which can better curl and break the chips and form ideal short spiral chips. And guide the directional flow of chips.

Description of drawings

Fig. 1 is a top view of a preferred embodiment provided by the utility model.

Fig. 2 is a bottom view of a preferred embodiment provided by the utility model.

Fig. 3 is a sectional view at A-A in Fig. 1 provided by the utility model.

Fig. 4 is an enlarged view of B in Fig. 3 provided by the utility model.

Fig. 5 is an enlarged view of B in Fig. 3 provided by the present invention.

In the figure, 1, the rake face; 11, the first positive rake face; 12, the second positive rake face; 13, the annular plane; 14, the arc surface; 2, the blade bottom surface; 3, the blade side; Insert body; 5. Center hole; 6. Cutting edge; 7. Avoidance groove; 8. Side positioning plane; β, second positive rake angle; d, edge width; h, vertical distance.

Detailed ways

The following are specific embodiments of the utility model and in conjunction with the accompanying drawings, the technical solution of the utility model is further described, but the utility model is not limited to these embodiments.

The circular milling insert shown in Fig. 1 and Fig. 3 comprises a circular truncated insert body 4 having a rake face 1, an insert bottom surface 2 and an insert side surface 3. A cutting edge 6 is formed between the knife face 1 and the insert side 3 . As shown in Figures 1 and 4, the rake face 1 includes a first positive rake surface 11 and a second positive rake surface 12 arranged in sequence along the direction from the side edge to the central hole 5, and the second positive rake surface 12 extends to At the annular plane 13 in the center of the insert, the second positive rake surface 12 and the annular plane 13 are transitionally connected by an arc surface 14 to form a chipbreaker structure of the insert, and at the same time, the second positive rake surface 12 is provided with a hollow groove 7. There are several escaping grooves 7 and they are uniformly arranged along the central axis of the central hole 5 . The unique escaping groove 7 structure is adopted to increase the heat dissipation area of the milling insert, reduce the friction area between chips and the milling insert, and allow the coolant to better enter the milling insert, which is beneficial to the lubrication and cooling of the cutting system. Moreover, this round milling insert adopts a unique cutting edge 6 structure, which is suitable for finishing or semi-finishing of workpiece materials. It can cut off the blade material sharply, which can improve the dimensional accuracy and surface quality of the workpiece, and at the same time cooperate with the unique chip breaking The flute structure can better curl and break chips, form ideal short spiral chips, and make chips discharge quickly.

As shown in Figure 1, the relief groove 7 extends into the annular plane 13 at the center of the blade, and the relief groove 7 gradually becomes wider and deeper along the direction from the second positive rake surface 12 to the annular plane 13. In this embodiment Among them, there are 12 avoidance grooves 7.

The angle between the first positive rake surface 11 and a plane perpendicular to the axis of the central hole 5 is a first positive rake angle, and the first positive rake angle is 0°. As shown in FIG. 5 , the included angle between the second positive rake surface 12 and a plane perpendicular to the axis of the central hole 5 is a second positive rake angle β, and the second positive rake angle β is 16°.

As shown in Figure 5, the edge width d of the first positive rake surface 11 along the second positive rake surface 12 to the blade side 3 is 0.12mm, and the vertical distance h between the annular plane 13 and the first positive rake surface 11 is 0.3mm.

As shown in FIG. 2 , four side positioning planes 8 are arranged symmetrically along the central axis of the central hole 5 near the blade bottom 2 on the blade side 3 , and the side positioning planes 8 extend to the blade bottom 2 and intersect with the blade bottom 2 . The flattened side positioning plane 8 cooperates with the corresponding knife handle, which can make the positioning of the blade more accurate and stable. During the processing, the risk of the blade loosening caused by the vibration of the circular milling blade can be reduced.

The specific embodiments described herein are only examples to illustrate the spirit of the present invention. Those skilled in the technical field to which the utility model belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the utility model or go beyond the appended claims defined range.

Claims (9)

1. a circular milling cutter blades, comprise and there is rake face (1), the round table-like blade body (4) of blade bottom surface (2) and blade side (3), the middle part of described blade body (4) has the centre bore (5) of through setting, cutting edge (6) is formed between described rake face (1) and blade side (3), it is characterized in that, described rake face (1) comprises the first positive rake angle face (11) and the second positive rake angle face (12) that set gradually along side to centre bore (5) direction, the second described positive rake angle face (12) extends to planar annular (13) place of blade center, second positive rake angle face (12) is connected by an arc surface (14) transition with planar annular (13), form inserts groove structure, the second described positive rake angle face (12) is provided with empty avoiding groove (7), described empty avoiding groove (7) for several and the centrally axis of hole (5) is evenly arranged.

2. a kind of circular milling cutter blades according to claim 1, it is characterized in that, described empty avoiding groove (7) extends in planar annular (13), and described empty avoiding groove (7) broadens gradually along the second positive rake angle face (12) to the direction of planar annular (13) and deepens.

3. a kind of circular milling cutter blades according to claim 2, is characterized in that, described empty avoiding groove (7) is 8-16.

4. a kind of circular milling cutter blades according to claim 3, is characterized in that, described empty avoiding groove (7) is 12.

5. a kind of circular milling cutter blades according to claim 1, is characterized in that, the first described positive rake angle face (11) is the first positive rake angle with the angle perpendicular to the plane of centre bore (5) axis, and the first described positive rake angle is 0 °; The second described positive rake angle face (12) is the second positive rake angle (β) with the angle perpendicular to the plane of centre bore (5) axis, and described the second positive rake angle (β) is 10 ° ~ 20 °.

6. a kind of circular milling cutter blades according to claim 5, is characterized in that, described the second positive rake angle (β) is 16 °.

7. a kind of circular milling cutter blades according to claim 1, is characterized in that, the first described positive rake angle face (11) along the second positive rake angle face (12) to sword hem width degree (d) of blade side (3) be 0.1 ~ 0.15mm; Described planar annular (13) is 0.2 ~ 0.4mm to the vertical range (h) in the first positive rake angle face (11).

8. a kind of circular milling cutter blades according to claim 7, is characterized in that, sword hem width degree (d) in described first positive rake angle face (11) is 0.12mm; Described planar annular (13) is 0.3mm to the vertical range (h) in the first positive rake angle face (11).

9. a kind of circular milling cutter blades according to claim 1, it is characterized in that, described blade side (3) is provided with the symmetrically arranged side, axis plane of orientation (8) of 4 centrally hole (5) near blade bottom surface (2) place, described side plane of orientation (8) extends to (2) place, blade bottom surface and crossing with blade bottom surface (2).