CN217749517U - Profile milling cutter for scrolls - Google Patents

Abstract

The utility model relates to a forming milling cutter suitable for a scroll, comprising a cutter main body, the cutter main body is provided with a first cutter part and a second cutter part in sequence along a first direction of the milling cutter axis, the first cutter part and the second cutter part are arranged in sequence along the first direction of the milling cutter axis. The tool part is stepped; the outer circumference of the tool body is provided with at least two chip removal grooves, the chip removal grooves extend from the end face of the first tool part to the second tool part; the chip removal grooves are located on the first tool part, the second tool part A first peripheral blade and a second peripheral blade are respectively formed on the cutter part, and the diameter of the second peripheral blade is larger than that of the first peripheral blade. The first circumferential edge and the second circumferential edge are used to form different parts on the scroll, which simplifies the tool changing and positioning steps and improves the machining accuracy.

Description

Form milling cutters for scrolls

technical field

The utility model relates to the field of milling processing, in particular to a forming milling cutter suitable for scroll disks.

Background technique

The aluminum alloy scroll disc is the core component of the scroll compressor in the new energy vehicle, and its machining accuracy directly affects the performance of the scroll compressor. The scroll is a typical thin-walled part. The scroll includes complex scroll lines and chamfering structures, which increases the difficulty of the tool cutting manufacturing process. Specifically, the forming chamfering is different from the tools required for forming other parts, so that the forming chamfering structure needs to change the tool, and higher precision is required in the forming process. After the tool is replaced, the tool needs to be repositioned. In order to ensure the accuracy of the forming position, the positioning requirements are high.

Utility model content

Based on this, it is necessary to provide a form milling cutter suitable for scroll disks to solve the problem that the positioning accuracy is difficult to guarantee after changing the cutter.

The present application provides a form milling cutter suitable for a scroll, comprising a cutter body, the cutter body is provided with a first cutter part and a second cutter part in sequence along the first direction of the milling cutter axis, the first cutter part and the second cutter The part is stepped;

At least two chip flutes are provided on the outer periphery of the tool body, and the chip flutes extend from the end face of the first tool part to the second tool part; the chip flutes form a first circle on the first tool part and the second tool part Edge and the second peripheral edge, the diameter of the second peripheral edge is greater than the diameter of the first peripheral edge.

In the technical solution of the embodiment of the present application, the first cutter part and the second cutter part are arranged in a stepped shape, and the protruding second cutter part facilitates chamfering, so that the first cutter part is forming the hole groove while the second cutter part Forming chamfering, since the first tool part and the second tool part are relatively fixed in the forming process, the accuracy can be guaranteed, so the positioning step can be omitted.

In one of the embodiments, a transition slope is provided at the connection between the first cutter part and the second cutter part, and the transition slope includes a slope extending from the back of the first peripheral blade to the rear of the second peripheral blade; the slope is along the first direction Offset gradually away from the milling cutter axis;

Wherein, the tool backs of the first peripheral edge and the second peripheral edge are the surfaces formed by the intersection of the chip flutes and the outer peripheries of the corresponding first tool part and the second tool part.

In one of the embodiments, the slope includes a first slope and a second slope arranged in sequence along the first direction, and the included angle between the first slope and the back of the first peripheral blade is smaller than that between the second slope and the back of the second peripheral blade. The formed included angle.

In one embodiment, the flute intersects with the slope of the transition slope to form a secondary end edge.

In one of the embodiments, the main end edge is formed by intersecting the chip flute with the end surface intersecting the first direction on the first tool part.

In one of the embodiments, a chamfer is provided on the angle formed by the intersection of the main end edge and the knife back of the first peripheral edge. axis, and the ends of the main end edges do not intersect.

In one of the embodiments, the cutting edge of the main end edge gradually deviates from the end toward the chamfering direction to a side away from the axis of the milling cutter.

In one embodiment, the flute includes an entry surface, and the entry surface intersects with the main end edge to form an edge of the end edge.

In one embodiment, a shank is provided at one end of the second cutter part, the first cutter part, the second cutter part and the shank are arranged in sequence along the first direction, and the diameter of the shank is not smaller than the diameter of the second peripheral edge.

In one of the embodiments, a zirconium nitride coating is provided on the aluminum alloy base layer of the first cutter part and the second cutter part.

Description of drawings

Fig. 1 is the front view of the milling cutter provided by one embodiment of the utility model;

Fig. 2 is a schematic structural view of a part of the milling cutter provided by an embodiment of the present invention;

Fig. 3 is a partially enlarged schematic diagram of a section at A place in Fig. 2;

Fig. 4 is a schematic structural view of the upper end edge of the milling cutter provided by an embodiment of the present invention;

Fig. 5 is a left view of the milling cutter provided by an embodiment of the present invention.

Reference signs:

11. The first tool department;

111, the first peripheral edge; 112, the main end edge; 113, chamfering;

1121. end;

12. The second cutting tool department;

121. The second week edge;

1211, the first slope; 1212, the second slope;

13. Chip flute;

131, groove bottom surface; 132, knife exit surface; 133, knife entry surface; 134, end edge edge;

14. End face;

15. Handle.

Detailed ways

In order to make the above purpose, features and advantages of the present utility model more obvious and understandable, the specific implementation of the present utility model will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a full understanding of the present invention. However, the utility model can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below limit.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial ", "radial", "circumferential" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, which are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying No device or element must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In this utility model, unless otherwise specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrated; may be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediary, and may be an internal communication between two elements or an interactive relationship between two elements, unless otherwise stated Clearly defined. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model according to specific situations.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first feature and the second feature through an intermediary indirect contact. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions are for the purpose of illustration only and are not intended to represent the only embodiment.

Referring to Figures 1 and 2, Figure 1 is a front view of a milling cutter according to some embodiments of the present application, and Figure 2 is a schematic structural diagram of a part of the milling cutter according to some embodiments of the present application. The present application provides a form milling cutter suitable for a scroll, comprising a cutter body, the cutter body is sequentially provided with a first cutter part 11 and a second cutter part 12 along the first direction of the milling cutter axis, the first cutter part 11 It is stepped with the second cutter part 12;

The outer periphery of cutter main body is provided with at least two flutes 13, and flutes 13 extend to the second cutter portion 12 from the end face 14 of first cutter portion 11; A first peripheral cutting edge 111 and a second peripheral cutting edge 121 are respectively formed on the cutter portion 12 , and the diameter of the second peripheral cutting edge 121 is larger than that of the first peripheral cutting edge 111 .

Specifically, the first cutter part 11 and the second cutter part 12 are stepped, and the outer diameter of the second cutter part 12 is larger than the outer diameter of the first cutter, so that a step is formed on the end surface of the second cutter part 12 . At the same time, through the same flute 13 , the end surface 14 penetrates through the first tool part 11 and extends to the second tool part 12 . The first peripheral cutting edge 111 and the second peripheral cutting edge 121 are formed at corresponding positions on the first cutter portion 11 and the second cutter portion 12 through the flutes 13 . And due to the diameter of the first cutter part 11 of the diameter of the second cutter part 12 self, the knife back as the first peripheral edge 111, the second peripheral edge 121 is constituted by the outer peripheries of the first cutter part 11, the second cutter part 12, so that the second The maximum contours of the peripheral cutting edge 111 and the second peripheral cutting edge 121 are determined by the outer peripheries of the first cutter part 11 and the second cutter part 12 . Finally, the diameter of the second peripheral edge 121 is larger than the diameter of the first peripheral edge 111 .

The first peripheral cutting edge 111 and the second peripheral cutting edge 121 are helical protrusions formed by the outer circumferences of the first peripheral cutting edge 111 and the second peripheral cutting edge 121 between two adjacent chip flutes 13 and chip flutes 13. The cutting edge, the first peripheral cutting edge 111 and the second peripheral cutting edge 121 are arranged around the cutter side. The back surfaces of the first peripheral cutting edge 111 and the second peripheral cutting edge 121 are formed by the intersection of the chip flute 13 and the outer peripheral sides of the first peripheral cutting edge 111 and the second peripheral cutting edge 121 . The chip flute 13 divides the outer periphery of the tool into several raised helical peripheral edges, and the surface of the peripheral edge on the original outer peripheral side is the knife back.

Firstly, the chip flutes 13 on the first cutter part 11 and the second cutter part 12 have the same shape, direction of rotation and helix angle, and the helix angle of the chip flutes 13 ranges from 32° to 35°. The uniformity of the chip flutes 13 on the first cutter part 11 and the second cutter part 12 is guaranteed, and the chip flutes 13 are prevented from being too narrow at the junction of the first cutter part 11 and the second cutter part 12 to affect the chip flow out smoothly sex. More importantly, through the stepped tool body, it is convenient to cut different positions at the same time. Especially in the process of machining the inner chamfer, the position of the inner chamfer and the position of the forming hole are relatively fixed. When using two tools for machining, it is necessary to perform positioning operation after changing the tool, which requires high positioning accuracy. It is easy to have the problem that the position of the inner chamfer does not correspond to the hole groove, but in this application, the first cutter part 11 and the second cutter part 12 arranged in steps facilitate the first cutter part 11 to form the hole groove at the same time. The second cutter part 12 processes inner chamfering, and because the first cutter part 11 and the second cutter part 12 are coaxially arranged, because the positional relationship between the two is fixed, the problem of misalignment is avoided during the forming process. It can efficiently process the side wall and forming chamfer of the workpiece to ensure the accuracy and consistency of its processing.

According to some embodiments of the present application, refer to FIGS. 2 and 3 , and FIG. 3 is a partially enlarged schematic diagram of a section at A in FIG. 2 . The junction of the first cutter part 11 and the second cutter part 12 is provided with a transition slope, and the transition slope includes a slope extending from the back of the first peripheral blade 111 to the back of the second peripheral blade 121; the slope is gradually moved away from the mill along the first direction. Tool axis offset.

The transition slope is continuously ground from the first peripheral blade 111 to the second cutter part 12 along the first direction, so that the outer edge of the first peripheral blade 111 smoothly transitions to the second cutter part 12 . The transition slope includes a slope connected to the back of the first peripheral knife 111 and the back of the second peripheral knife 121 . The back side of the first peripheral blade 111 and the back side of the second peripheral blade 121 are the outer peripheral side walls of the first cutter portion 11 and the second cutter portion 12, because the diameter d ₂ of the second peripheral blade 121 is greater than that of the first peripheral blade 111 Diameter d ₁ , so the slope connecting the back of the first peripheral blade 111 and the back of the second peripheral blade 121 is a plane or an arc that is offset relative to the first direction. Specifically, the range of d ₁ is 8 mm to 10 mm.

Further, buffer lands are provided on the circumferential cutting edges of the first cutter part 11 and the second cutter part 12, and the buffer lands are used to protect the circumferential cutting edges. The thickness range of the cache margin is 0.03mm to 0.06mm, and the relief angle of the cache margin is 2° to 3°. By setting the caching margin to protect the circumferential cutting edge, the service life of the tool is improved.

The flanks of the first peripheral blade 111 and the second peripheral blade 121 adopt the form of straight flanks. Due to the small elastic modulus of the aluminum alloy, the workpiece is prone to large elastic deformation during cutting, and it is difficult to obtain high-quality Precision. At the same time, it will also cause severe friction between the flank and the machined surface, which will aggravate the wear of the tool and cause vibration, especially for the processing of thin-walled parts such as scrolls. The first relief angle of the first peripheral blade 111 and the second peripheral blade 121 is 10°-14°, and the second relief angle is 20°-25°. In order to increase the gap between the cutting tool and the machined surface, reduce the wear caused by the friction between the circumferential edge of the tool and the aluminum alloy material and reduce the heat generated by friction.

According to some embodiments of the present application, further, the chip flute 13 intersects with the slope of the transition slope to form a secondary end edge as a third cutting edge.

The intersection of the chip flute 13 and the slope of the transition slope forms a secondary end edge different from the cutting direction of the first peripheral edge knife 111 and the second peripheral edge knife 121, so as to facilitate the formation of a more complicated structure of the secondary end edge. The strength at the connection position between the first cutter part 11 and the second cutter part 12 can be effectively improved by setting the transition slope, and the transition slope forms a third cutting edge between the first cutter part 11 and the second cutter part 12 to increase the The area of the cutting edge is increased, and the cutting efficiency is improved.

According to some embodiments of the present application, the slope includes a first slope 1211 and a second slope 1212 arranged in sequence along the first direction, and the angle formed between the first slope 1211 and the back of the first peripheral edge 111 is smaller than that between the second slope 1212 and the second slope 1212. The included angle that the second peripheral edge 121 knife back forms.

The included angle δ ₁ formed by the first slope 1211 and the back of the first peripheral edge 111 , and the included angle δ ₂ formed by the second slope 1212 and the back of the second peripheral edge 121 , where δ ₁ <δ ₂ is satisfied. Specifically, the included angle at δ1 is the included angle formed by the intersection of the _first slope 1211 and the straight line where the back of the blade at the section of the first peripheral edge 111 is located. The included angle at δ2 is the included angle formed by the intersection of the _second inclined plane 1212 and the straight line where the back of the blade at the section of the second peripheral edge 121 is located.

The first inclined surface 1211 and the second inclined surface 1212 with different inclinations are convenient for forming different types of chamfering structures. Or because the first bevel 1211 and the second bevel 1212 have different degrees of inclination, so the cutting amount of the first bevel 1211 and the second bevel 1212 are different, and the single cutting amount can be reduced by the first bevel 1211 and the second bevel 1212 working together, thereby Protect the secondary end edge and increase the service life of the tool.

According to some embodiments of the present application, the chip flute 13 intersects with the end surface 14 intersecting the first direction on the first cutter portion 11 to form a main end edge 112 . The end surface 14 is located at the starting end of the milling cutter in the first direction, specifically, the end surface 14 is preferentially in contact with the cutting material during cutting.

The chip flute 13 intersects with one end of the first peripheral cutting edge 111 at the end surface 14 to form a main end cutting edge 112 . The main end edge 112 serves as the first contact with the cutting material to form the bottom. In this solution, the end of the main end edge 112 away from the axis is in contact with the cutting material to achieve cutting material. The side wall is formed by cutting the first peripheral edge 111, and the bottom surface is formed by the main end edge 112, so as to improve the surface finish of the workpiece and improve the cutting efficiency.

Specifically in this case, refer to Figures 4 and 5, Figure 4 is a schematic structural view of the upper end edge of the milling cutter according to some embodiments of the present application, and Figure 5 is a left view of the milling cutter according to some embodiments of the present application. There are four chip flutes 13 , four first peripheral edges 111 are formed by the four chip flutes 13 , and each first peripheral edge 111 is located on the end surface 14 to form a main end edge 112 . The flutes 13 are arranged in an uneven distribution with respect to the circumference of the cutter. The included angles between at least two adjacent first peripheral edges 111 are different, that is, θ1≠θ2, and the angle difference is 3°˜6°. The design of the first peripheral edge 111 with unequal tooth division can produce alternating cutting frequency during high-speed cutting, and it is not easy to resonate with the machine tool, effectively eliminating or avoiding cutting chatter when the tool is processing thin-walled parts.

According to some embodiments of the present application, specifically, a chamfer 113 is provided on the angle formed by the intersection of the main end edge 112 and the knife back of the first peripheral edge 111, and the other side of the main end edge 112 corresponding to the chamfer 113 is The end 1121 is close to the axis of the first cutter portion 11 , and the ends 1121 of the main end edge 112 do not intersect each other.

A vacant slot is formed on the end surface 14 close to the axis, thereby increasing the area of the chip flute on the end surface 14 to expand the cutting chip space of the tool. At the cutting point where the main end edge 112 intersects the back of the first peripheral edge 111, the intersecting angles are chamfered. In this solution, the intersecting angles are rounded, which can effectively eliminate or avoid the knife Stress concentration at the tip improves the strength of the tip edge and reduces the risk of tip chipping, damage or plastic deformation wear.

According to some embodiments of the present application, the cutting edge of the main end edge 112 gradually deviates from the end 1121 toward the direction of the chamfer 113 to a side away from the axis of the first cutter portion 11 .

The edge of the main end edge 112 is sunken towards the axis, and the concave angle of the edge of the main end edge 112 is 3.5°, so as to reduce the contact area between the edge of the main end edge 112 and the material, thereby increasing the cutting of the main end edge 112 force, making the main end edge 112 sharper. On the other hand, the cutting edge of the main end edge 112 is concave inward, so that an inward concave space is formed on the end surface 14, so as to further expand the chip cutting space of the tool. Improving the chip holding capacity during cutting can avoid the problems of low machining accuracy and poor surface roughness caused by poor chip removal.

According to some embodiments of the present application, as shown in FIG. 4 . The flute 13 includes an entry surface 133 , and the entry surface 133 intersects with the main end edge 112 to form an end edge 134 .

The flute 13 includes an entry surface 133 , a bottom surface 131 , and an exit surface 132 . The knife exit surface 132 and the knife entrance surface 133 are arranged on two sides corresponding to the groove bottom surface 131 , so that the knife entrance surface 133 and the main end edge 112 form an end edge 134 as a cutting edge. The cutting surface 132 forms the heel back of the main end edge 112 . The entry surface 133 is inclined relative to the tangent line of the connection point with the groove bottom surface 131, so as to adjust the included angle formed by the entry surface 133 where the end edge 134 is located and the main end edge 112, and adjust the first circle on the first cutter portion 11. The size and cutting edge strength of the edge 111 and the main end edge 112 are to improve the cutting performance of the milling cutter.

According to some embodiments of the present application, one end of the second cutter part 12 is provided with a shank 15, and the first cutter part 11, the second cutter part 12 and the shank 15 are sequentially arranged along the first direction, and the diameter of the shank 15 is not less than The diameter of the second peripheral edge 121 .

The shank 15 is used for clamping and fixing the cutter. At the same time, the first cutter part 11, the second cutter part 12 and the handle 15 are coaxially arranged so as to reduce the centrifugal force generated by inertia when rotating the milling cutter. The diameter of the shank portion 15 is greater than or equal to the diameter d ₂ of the second knife portion 12 .

According to some embodiments of the present application, multiple crystal structure coatings are provided on the cutter on the milling cutter. Zirconium nitride coatings are provided on the aluminum alloy base layers of the first cutter part 11 and the second cutter part 12 .

The material of the milling cutter is a high-hardness HRA ultra-fine-grained hard alloy rod, specifically, the material of the milling cutter is aluminum alloy. The aluminum alloy material contains silicon and cobalt, wherein the cobalt content is 9%. For silicon-aluminum alloys, the Si-containing element can effectively improve the tensile strength, hardness and strength at high temperature of the material, but at the same time, it is also prone to hard spots of free silicon, which makes the machinability worse, especially for high-silicon aluminum alloys ( Si≥12%) is more obvious. The melting point of aluminum alloy is low, and the plasticity increases after the temperature rises. When the chips flow out, under the action of high temperature and high pressure, the friction between the bottom layer of the chips and the rake face is relatively large, and the stagnation phenomenon is serious, which easily produces built-up edge, which leads to the machining accuracy of the workpiece. Decrease, the surface roughness becomes worse, and the tool life is reduced. In this solution, the rake angle of the peripheral edge ranges from 9° to 12°. While preventing chipping and damage of the cutting edge, it takes into account the strength, sharpness and chip removal performance of the tool.

Specifically, for the grinding and manufacturing of the milling cutter, an ultra-fine abrasive diamond resin grinding wheel is selected, and the inside of the tool groove and the front and flank faces of the cutting edge are finely polished to reduce the friction coefficient between chips and the rake face. Make chip removal smoother. At the same time, the cutting edge must be rounded and passivated by quartz sand blasting before coating to ensure that the cutting edge has a smooth grinding pattern and no microscopic defects such as sawtooth.

After passivation treatment, zirconium nitride (ZrN) coating treatment was carried out on the tool surface by physical vapor deposition (PVD). Zirconium nitride (ZrN) is an insoluble compound with a golden yellow color, high decomposition temperature, good chemical stability, and good high temperature resistance, corrosion resistance and surface lubricity. Zirconium nitride (ZrN) coating can effectively reduce the friction coefficient between the chip and the rake face of the tool while improving the surface hardness and comprehensive mechanical properties of the tool, block the element affinity reaction between the tool and the workpiece, and eliminate or Avoid bonding and diffusion wear on the cutting edge.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the utility model, and the description thereof is relatively specific and detailed, but it should not be interpreted as a limitation on the patent scope of the utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the scope of protection of the utility model patent should be based on the appended claims.

Claims (10)

1. The formed milling cutter suitable for the scroll is characterized by comprising a cutter body, wherein the cutter body is sequentially provided with a first cutter part and a second cutter part along a first direction of the axis of the milling cutter, and the first cutter part and the second cutter part are in a step shape;

at least two chip grooves are formed in the periphery of the cutter main body, and extend from the end face of the first cutter part to the second cutter part; the chip groove is provided with a first peripheral edge and a second peripheral edge on the first cutter part and the second cutter part respectively, and the diameter of the second peripheral edge is larger than that of the first peripheral edge.

2. The milling cutter according to claim 1, wherein a junction of the first cutter portion and the second cutter portion is provided with a transition ramp comprising a chamfer extending from the first peripheral shelf back face to the second peripheral shelf back face; the bevel is offset gradually away from the milling cutter axis in a first direction;

the tool back surfaces of the first and second peripheral edges are surfaces formed by intersecting the chip grooves and the peripheries of the corresponding first and second tool parts.

3. The milling cutter according to claim 2, wherein the chamfer includes a first chamfer and a second chamfer disposed in series along a first direction, the first chamfer forming a smaller included angle with the first peripheral edge back surface than the second chamfer forming a smaller included angle with the second peripheral edge back surface.

4. The milling cutter according to claim 2, wherein the intersection of the flute with the chamfer of the transition ramp forms a minor end edge.

5. The milling cutter according to claim 1, wherein the flutes intersect end surfaces on the first tool portion that intersect the first direction to form major end edges.

6. The milling cutter according to claim 5, wherein the main end edge intersects the back surface of the first peripheral edge to form a chamfer, the main end edge has a distal end on the other side thereof corresponding to the chamfer, the distal end is close to the axial center of the first tool portion, and the distal ends of the main end edges do not intersect with each other.

7. The milling cutter according to claim 6, wherein the edge of the major end edge is gradually offset to a side away from the milling cutter axis from the tip in a direction toward the chamfer.

8. The milling cutter according to claim 5, wherein the flute comprises a rake face that intersects the major end edge to form an end edge.

9. The milling cutter according to any one of claims 1 to 8, wherein the second tool part has a shank portion at one end, the first tool part, the second tool part and the shank portion being arranged in the first direction in this order, the shank portion having a diameter not smaller than the diameter of the second peripheral edge.

10. The milling cutter according to claim 9, wherein a zirconium nitride coating is provided on the aluminum alloy base layer of the first and second tool portions.

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