side milling cutter

Abstract

The invention relates to a side milling cutter (100) having a main body (10) and a disc-shaped cartridge (20), the main body extending along a predetermined axis of rotation (R) from a first end (11) having an interface for connection to a rotary drive to a free second end (12) on which a bearing face (14) for the disc-shaped cartridge (20) is configured, the disc-shaped cartridge being fastened to the second end (12) and being supported on the bearing face (14) by a first main surface (21) facing the main body (10), the cartridge's outer periphery projecting radially from the main body (10) and having a central through-opening (23) axially through the disc-shaped cartridge (20). A plurality of coolant supply channels (60) for supplying coolant to the second end (12) of the main body (10) are configured in the main body (10). A plurality of coolant distribution channels (50) for supplying coolant to the outer periphery of the cartridge (20) are formed on the disc-shaped cartridge (20). At least two of the plurality of coolant distribution channels (50) branch off from a common coolant distribution chamber (70; 55, 61, 62) which is configured between the main body (10) and the disc-shaped cartridge (20) and to which at least two of the plurality of coolant supply channels (60) open.

Description

Technical Field

[0001] The present invention relates to a side milling cutter having a body and a disc-shaped tool holder, the body extending along a predetermined axis of rotation from a first end having an interface for connection to a rotary drive to a free second end, on which a support surface for the disc-shaped tool holder is constructed, the disc-shaped tool holder being fastened to the second end. Background Technology

[0002] Side end mills are frequently used to create grooves or slots in workpieces and to cut materials that are primarily metallic. In the case of a side end mill, a disc-shaped tool holder is arranged on a body configured for connection to a rotary drive. This tool holder has multiple cutting edges arranged around its perimeter. Here, the cutting edges are typically formed by tool inserts held in place on the corresponding tool holder and are usually made of a harder and more wear-resistant material than the body and the disc-shaped tool holder. For example, the body and the disc-shaped tool holder can be made of tool steel, and the cutting edges can be made of carbides, cermets, ceramics, or superhard materials such as PCD (polycrystalline diamond) or CBN (cubic boron nitride).

[0003] DE 20 2017 105 606 U1 describes a side end mill having a body and a disc-shaped tool holder fastened to the body. Multiple coolant supply channels are configured in the body, each opening in an elongated end-side coolant distribution chamber, through which coolant is delivered in each case to multiple inlet openings of the disc-shaped tool holder. Summary of the Invention

[0004] The object of the present invention is to provide an improved side end mill in which the supply of coolant to the cutting edges is improved, and in which design freedom related to the construction of the disc-shaped tool holder is increased.

[0005] If the terms axial, radial, or tangential are used in the context of the description below, each of these specifications refers to the axis of rotation of the side milling cutter, unless the meaning is different from the specific context.

[0006] This objective is achieved by a side milling cutter according to the invention. Advantageous improvements are described in detail in other preferred embodiments.

[0007] The side end mill has a body and a disc-shaped tool holder. The body extends along a predetermined axis of rotation from a first end having an interface for connection to a rotary drive to a free second end. A support surface for the disc-shaped tool holder is formed on the free second end. The disc-shaped tool holder is fastened to the second end and supported on the support surface by a first main surface facing the body. The outer periphery of the tool holder projects radially from the body and has an axial through-hole extending through the center of the disc-shaped tool holder. Multiple coolant supply channels are formed in the body for supplying coolant to the second end of the body. Multiple coolant distribution channels are formed on the disc-shaped tool holder for supplying coolant to the outer periphery of the tool holder. At least two of the multiple coolant distribution channels branch from a common coolant distribution chamber constructed between the body and the disc-shaped tool holder, and at least two of the multiple coolant supply channels lead to this common coolant distribution chamber.

[0008] Because a common coolant distribution chamber is provided, and at least two of the multiple coolant supply channels lead to this common coolant distribution chamber, coolant can be reliably supplied to the outer periphery of the tool holder even if the coolant supply channels are blocked, for example, due to contaminants. Because an axial through-hole is provided through the center of the disc-shaped tool holder, the side end mill can be configured as a so-called insert side end mill, which can be fastened to a rotary drive from its free second end by means of a central fastening screw, the side end mill being connected to the rotary drive through an interface constructed at its first end. Preferably, all of the multiple coolant supply channels lead to the common coolant distribution chamber, and all coolant distribution channels of the tool holder branch from the common coolant distribution chamber.

[0009] According to one improvement, the common coolant distribution chamber extends in a ring around the axis of rotation. In this case, a particularly uniform distribution of coolant to all coolant distribution channels is achieved.

[0010] According to an improvement, each coolant distribution channel has a first channel portion extending inside the tool holder, having a closed structure on both the side of a first main surface and the side of a second main surface opposite to the first main surface of the tool holder, and having at least one outlet opening on the outer periphery of the tool holder, as well as an inlet portion leading to the through opening and the first main surface, and extending only on a portion of the thickness of the tool holder within the through opening region. In this case, a relatively large cross-section can be provided via the inlet portion to deliver coolant into the disc-shaped tool holder, resulting in low flow resistance.

[0011] According to one improvement, each coolant distribution channel has a connecting portion that connects the inlet portion to the first channel portion and has a closed configuration in the direction of the through opening and relative to the second main surface. Because of the connecting portion, the axial height of the inlet portion leading to the through opening can be selected such that it is only a relatively small fraction of the axial length of the through opening, and thus the remainder of the axial length of the through opening can be used for sealing to prevent unwanted coolant leakage.

[0012] If the axial height of the inlet portion leading to the through opening is at most one-third of the thickness of the disc-shaped tool holder at the through opening, a reliable seal can be provided to prevent unwanted coolant from escaping through the remaining majority of the axial height of the through opening. The thickness of the tool holder at the through opening can, for example, correspond to the thickness of the tool holder in the region for the tool insert. In particular, when the tool holder is stepped in the region of the through opening, the area of ​​the first main surface supported on the support surface is thus configured as a convex or concave shape; however, the thickness of the tool holder at the through opening differs from the thickness of the tool holder at its outer periphery.

[0013] According to one improvement, the coolant distribution chamber has a tool support side portion formed by a recess in a disc-shaped tool holder, the recess abutting a first main surface and a through opening and extending between the inlet portions of the corresponding coolant distribution channels. In this configuration, uniform distribution of coolant is achieved around the periphery of the tool holder, and a large overall flow cross-section is provided for the coolant to enter the coolant distribution channels.

[0014] If the axial height of the tool holder side portion of the coolant distribution chamber is at most one-third the thickness of the disc-shaped tool holder at the through opening, then sufficient remaining axial height of the through opening can be obtained in those regions along the circumferential direction, where the recess of the tool support side portion of the coolant distribution chamber is constructed to ensure a reliable seal against unwanted coolant leakage. The axial height of the tool holder side portion of the coolant distribution chamber, i.e., the axial height of the recess, preferably corresponds substantially to the axial height of the inlet portion of the coolant distribution channel leading to the through opening.

[0015] According to one improvement, a centering pin is constructed at the second end of the main body, protruding axially from the support surface, and the through opening in the tool holder conforms to the outer contour of the centering pin. In this case, the interaction between the through opening and the outer contour of the centering pin reliably prevents unwanted coolant leakage.

[0016] According to one improvement, the through opening at the second end extends through the centering pin. In this case, the side milling cutter can be easily secured to the rotary drive via the passage from the second end through the through opening. For example, it can be engaged into the through opening by means of a screwdriver.

[0017] Preferably, the inner circumferential surface of the through-hole of the tool holder seals against the outer circumferential surface of the centering pin. In this case, undesirable leakage of coolant can be reliably prevented. For example, to achieve a sealing fit, the inner circumferential surface of the through-hole and the outer circumferential surface of the centering pin can be honed. The outer circumferential surface of the centering pin and the inner circumferential surface of the through-hole can preferably have a rotationally symmetrical configuration about the axis of rotation. The outer circumferential surface of the centering pin and the inner circumferential surface of the through-hole can be, for example, conical; however, the inner circumferential surface is preferably a hollow cylindrical configuration, and the outer circumferential surface can be a correspondingly cylindrical configuration, as this makes particularly simple and inexpensive production possible.

[0018] According to one improvement, multiple coolant supply channels lead radially outward from the centering pin to a common coolant distribution chamber. In this case, the common coolant distribution chamber can be constructed particularly simply and inexpensively, minimizing flow resistance and ensuring reliable and uniform coolant distribution throughout the perimeter.

[0019] According to one improvement, the coolant distribution chamber has a first main body side portion formed by a groove extending around a centering pin and having a deepened structure relative to the support surface. Here, a sufficient cross-section of the coolant distribution chamber can be provided particularly simply and cost-effectively, and uniform distribution of coolant is achieved over the entire periphery of the centering pin.

[0020] According to one improvement, the coolant distribution chamber has a second main body side portion formed by a circumferential recess formed on the centering pin. In this case, the cross-section of the coolant distribution chamber can be enlarged in a particularly simple manner, resulting in low flow resistance. Preferably, the recess can be constructed in the region between the sealing outer peripheral surface of the centering pin and the support surface of the disc-shaped tool holder.

[0021] According to one improvement, the tool holder has multiple tool holders distributed around the periphery of the disc-shaped tool support for receiving replaceable tool inserts. In this case, the tool holder can be inexpensively manufactured, for example, from tool steel, and the tool inserts, which only have an edge that contacts the workpiece, must be formed from a particularly hard and wear-resistant material, such as carbides (sintered carbides).

[0022] According to one improvement, the tool holder is configured to receive replaceable tool inserts, i.e., such that they all project axially from the disc-shaped tool holder on both sides. In this case, relatively narrow slots can also be constructed using a side milling cutter, and / or material cutting can be performed with a relatively small slot width.

[0023] If the side end mill has multiple replaceable cutting inserts, which are fastened to the tool holder and form the area where the side end mill protrudes furthest from the body in the axial direction, then the groove can also be constructed in the cavity, for example, very close to the bottom of the cavity. Attached Figure Description

[0024] Other advantages and conveniences of the present invention are based on the following description of an exemplary embodiment with reference to the accompanying drawings, wherein:

[0025] Figure 1 A schematic perspective view of a side end mill according to one embodiment is shown.

[0026] Figure 2 It shows the relationship with Figure 1 A perspective view of a corresponding side end mill, which has multiple replaceable cutting inserts fastened to a corresponding tool holder.

[0027] Figure 3 It shows Figure 2 A schematic exploded view of a side milling cutter.

[0028] Figure 4 A plan view of the free second end of the main body is shown in this embodiment.

[0029] Figure 5 It shows along Figure 4 A diagram of the cross section of line CC.

[0030] Figure 6 It shows Figure 5 A magnified view of detail D.

[0031] Figure 7 A schematic perspective view of the lower side of a disc-shaped tool holder on which cutting tools are arranged is shown.

[0032] Figure 8 A schematic perspective view of a disc-shaped tool holder with hidden lines indicated by dashed lines is shown.

[0033] Figure 9 A schematic perspective view of the lower side of a tool holder with hidden lines indicated by dashed lines is shown.

[0034] Figure 10 It shows Figure 9 A magnified view of detail E, marked with a circle.

[0035] Figure 11 A schematic diagram of a tool holder with hidden lines indicated by dashed lines, viewed from below, is shown.

[0036] Figure 12 It shows along Figure 11 A cross-sectional view of line DD in the middle.

[0037] Figure 13 A schematic diagram of a side end mill with a free second end showing a hidden line indicated by a dashed line is shown.

[0038] Figure 14 It shows along Figure 13 The sectional view of line FF in the middle.

[0039] Figure 15 It shows Figure 14 A magnified view of the detail G circled in the center.

[0040] Figure 16 It shows the corresponding Figure 13 The view,

[0041] Figure 17 It shows along Figure 16 A cross-sectional view of line HH in the diagram.

[0042] Figure 18 It shows Figure 17 A magnified view of detail I circled in the center.

[0043] Figure 19 It shows the corresponding Figure 13 The illustration,

[0044] Figure 20 It shows along Figure 19 A cross-sectional view of line JJ in the diagram.

[0045] Figure 21 It shows Figure 20 A magnified view of the details circled in the center.

[0046] Figure 22 A schematic perspective view of a modified disc tool holder is shown, and

[0047] Figure 23 A schematic perspective view of a modified disc tool holder with hidden lines indicated by dashes is shown. Detailed Implementation

[0048] Refer to the following text Figures 1 to 21 An embodiment of a side milling cutter is described in more detail.

[0049] In this particular embodiment, the side end mill 100 is configured as a so-called insert side end mill for end-mounting on the rotary drive of the machining tool.

[0050] The side end mill 100 has a body 10 and a disc-shaped tool holder 20, the body being particularly... Figure 4 , Figure 5 and Figure 6 The image shows in more detail that the disc-shaped tool holder is particularly... Figures 7 to 10 It is shown in more detail below.

[0051] The main body 10 extends from the first end 11 to the free second end 12 along a predetermined rotation axis R, as follows: Figure 5 As particularly visible in the illustration, an interface for connection to a rotary drive is provided at the first end 11. In particular, two recesses 13 are provided at the first end 11 for interacting with corresponding drives on the rotary drive to transmit torque.

[0052] A support surface 14 for supporting the abutment disc-shaped tool holder 20 is constructed at the free second end 12 of the main body 10. In an exemplary embodiment, the support surface 14 is formed by a planar end side of the annular structure of the main body 10, which extends in a plane perpendicular to the axis of rotation R.

[0053] Starting from the second end 12 of the main body 10, a plurality of threaded holes 15 are provided in the support surface 14 for receiving fastening screws 30 for securing the disc-shaped tool holder 20 to the main body 10. Although a total of four such threaded holes 15 and four fastening screws 30 are provided in the embodiment specifically shown, the number of threaded holes 15 for the fastening screws 30 may be less than four or more than four.

[0054] A centering pin 16, projecting axially relative to the support surface 14, is constructed at the second end 12 of the body 10. The function of this centering pin 16 will be described in more detail below. In particular, as Figure 3 and Figure 5 As shown, the centering pin 16 has a cylindrical outer peripheral surface 16a.

[0055] like Figure 5As can be seen, a through opening 17 is specifically constructed in the body 10, extending along the axis of rotation R from the second end 12 to the first end 11. Here, the through opening 17 also extends, particularly through the centering pin 16, and has an opening at the second end 12. The through opening 17 is configured to receive a fastening device (not shown) by which the side mill 100 can be fastened to the rotary drive via its interface located at the first end 11. The inner wall of the through opening 17 is particularly stepped and has a shoulder 17a that extends substantially perpendicular to the axis of rotation R, and the fastening device can be securely supported on this shoulder to fasten the side mill 100 to the rotary drive. Operation of the fastening device can begin from either the body 10 or the free second end 12 of the side mill 100.

[0056] The disc tool holder 20 will be described in more detail below. For example... Figures 1 to 3 , Figure 7 and Figure 8 As can be seen, the disc-shaped tool holder 20 is relatively thin, having a first main surface 21 and a second main surface 22 parallel to the first main surface. In the assembled state of the side milling cutter 100, the first main surface 21 and the second main surface 22 each extend perpendicularly to the axis of rotation R. The first main surface 21 is constructed and arranged facing the body 10 to be supported on the support surface 14 by an annular region. The annular region may, for example, preferably have a planar configuration with respect to the rest of the first main surface 21. However, it is also possible for the annular region to have a stepped configuration relative to the rest of the first main surface 21, particularly as a protrusion. The second main surface 22 is constructed to face away from the body 10. The thickness of the disc-shaped tool holder 20 and the axial height of the centering pin 16 are adapted to each other such that, in the assembled state of the side milling cutter 100, the centering pin 16 does not protrude from the end side but is substantially flush with the second main surface 22 of the tool holder 20, as particularly in… Figure 1 and Figure 2 It can be seen in the image.

[0057] like Figure 7 and Figure 8 As shown, specifically, a through opening 23 penetrating the tool holder 20 from the second main surface 22 to the first main surface 21 is centrally constructed within the tool holder 20. The through opening 23 extends coaxially with respect to the axis of rotation R and has an inner circumferential surface 23a with a shape adapted to precisely fit into the outer circumferential surface 16a of the centering pin 16. In the exemplary embodiment specifically shown, the inner circumferential surface 23a has a hollow cylindrical shape. The inner circumferential surface 23a of the tool holder 20 and the outer circumferential surface 16a of the centering pin 16 are adapted to each other such that they abut against each other in a sealing manner with respect to the coolant, as will be described in more detail below.

[0058] Holes 24 for receiving fastening screws 30 are constructed in the tool holder 20 radially outward from the through opening 23, as specifically in Figure 7 and Figure 8 As can be seen. For example... Figure 8 As shown, in particular, the hole 24 has an inclined structure adjacent to the second main surface 22, resulting in... Figure 1 and Figure 2 In the installation state shown, the head of the fastening screw 30 does not protrude from the second main surface 22.

[0059] The tool holder 20 projects radially from the body 10 and has an outer diameter much larger than the body 10. Multiple tool holders 25 for receiving replaceable tool inserts 40 are configured to be distributed on the outer periphery of the tool holder 20, as specifically in… Figure 1 As can be seen in the illustration. Although the specific exemplary embodiment shown illustrates one implementation in which a total of eight tool holders 25 on which the cutting blades 40 are arranged are provided, for example, fewer or more tool holders 25 may also be provided. Here, in particular, the number of tool holders may vary, for example, depending on the outer diameter of the tool holder 20. The tool holders 25 are configured such that each cutting blade 40 arranged thereon protrudes radially from the tool holder 20 with a cutting edge 41.

[0060] In this embodiment, the tool holder 25 is configured such that the cutting edges 41 of the tool insert 40 each project axially from the tool holder 20 on both sides, that is, projecting axially beyond the second main surface 22 and projecting axially beyond the first main surface 21, as particularly in Figure 12 As can be seen in the image. Here, the axial width of the cutting edge is between 1.5 mm and 12 mm, preferably between 2 mm and 10 mm. The thickness of the tool holder 20, that is, the interval between the first main surface 21 and the second main surface 22, is slightly smaller than the width of the cutting edge (e.g., within one-tenth of a millimeter) to ensure sufficient free movement.

[0061] In the case of the side milling cutter 100, the cutting edge 41 forms the areas of the side milling cutter 100 that protrude axially at the second end 22.

[0062] In the exemplary embodiment shown, the replaceable cutting tool insert 40 is held on the tool holder 25 via resiliently deflectable clamping fingers and is constructed in the material of the tool holder 20. Grooves 26 are each constructed on the outer periphery of the tool holder 20, adjacent to the tool holder 25, as particularly in… Figure 7 and Figure 8 It can be seen in the image.

[0063] The side end mill 100 according to this embodiment has an internal coolant supply structure for directionally supplying coolant to a region of the tool holder 25. The coolant supply structure is configured such that coolant outlets are provided, each coolant outlet being allocated to the tool holder 25 and the tool insert 40 fastened to the tool holder. The construction of the internal coolant supply structure will be described in more detail below.

[0064] First, refer to Figures 7 to 10 The coolant distribution channel 50 constructed in the disc tool holder 20 is described in more detail.

[0065] Multiple individual coolant distribution channels 50 are constructed in the tool holder 20. In this embodiment, the number of coolant distribution channels 50 corresponds to the number of tool holders 25 for replaceable tool inserts 40, resulting in each tool holder 25 being assigned an individual coolant distribution channel 50.

[0066] In the illustrated exemplary embodiment, each coolant distribution channel 50 has an outlet opening 51 on the outer periphery of the tool holder 20, through which coolant escaping can be supplied to the base 25 or the region of the tool insert 40 disposed on the base. Although the illustrated example shows one implementation in which the outlet openings 51 are each arranged in the region of the lowest point of the recess 26, other embodiments are possible. For example, the outlet openings 51 may be arranged closer to the cutting surface of the respective tool insert 40, or adjacent to the open space of the respective tool insert 40. Although in the illustrated exemplary embodiment, each coolant distribution channel 50 has only one outlet opening 51, it may also be configured, for example, that the coolant distribution channels 50 branch and each have multiple outlet openings 51, for example, outlet openings oriented in the direction of the cutting surface and outlet openings oriented in the direction of the open space.

[0067] In particular, such as Figure 8 As can be seen, each of the coolant distribution channels 50 in the tool holder 20 has a first channel portion 52, which extends toward the corresponding outlet opening 51 and extends inside the tool holder 20. The first channel portion 52 extends inside the tool holder 20 such that it has a closed configuration on one side of the first main surface 21 and on one side of the opposing second main surface 22. The first channel portion 52 is preferably configured at least substantially centrally between the first main surface 21 and the second main surface 22 of the tool holder 20.

[0068] As from Figure 10 The detailed view can be seen, especially from Figure 9As can be seen in the enlarged view of circled detail E, each of the coolant distribution channels 50 has an inlet portion 53 in the radially inner region of the tool holder 20, which has an opening configuration relative to the first main surface 21 and relative to the through opening 23. Starting from the first main surface 21 of the tool holder 20, the inlet portion 53 extends only over a portion of the thickness of the tool holder 20 in the region of the through opening 23; specifically over at most one-third of the thickness of the disc-shaped tool holder 20 at the through opening 23. In other words, the axial height of the inlet portion 53 is at most one-third of the thickness of the tool holder 20 at the through opening 23. The inlet portion 53 can be constructed, for example, by a milled portion starting from the first main surface 21 and from the through opening 23.

[0069] like Figure 10 and Figure 12 As shown, specifically, the inlet portion 53 is connected to the first channel portion 52 via its connecting portion 54. The connecting portion 54 can be constructed, for example, specifically via a transverse hole starting from the first main surface 21, which connects the inlet portion 53, opening toward the first main surface 21, to the first channel portion 52, which is further located inside the tool holder 20. The connecting portion 54 is closed relative to the second main surface 22 and in the direction of the through opening 23, resulting in the inner peripheral surface 23, which is sealed relative to the outer peripheral surface 16a of the centering protrusion 16, extending in the region of the inlet portion 53 beyond at least two-thirds of the thickness of the tool holder 20 in the region of the through opening 23. Specifically in Figure 12 These features can also be seen in the cross-sectional view of the area of ​​the entrance portion 53.

[0070] Similarly, Figure 10 and Figure 12 As shown, a recess 55 adjacent to the first main surface 21 and the through opening 23 is constructed between adjacent inlet portions 53 of adjacent coolant distribution channels 50. The function of the recess 55 will be explained in more detail later. In this embodiment, the recess 55 is formed by a chamfered surface or a bevel, which in each case connects adjacent inlet portions 53. Thus, the recess 55 can be produced in a particularly simple manner by a circumferential chamfer before or after the construction of the inlet portion 53. In the thickness direction of the tool holder 20, the recess 55 also extends at most more than one-third of the thickness of the tool holder 20 in the region of the through opening 23, resulting in the sealing inner circumferential surface 23a also extending in the region of the recess 55 more than two-thirds of the thickness of the disc tool holder 20 there.

[0071] Multiple coolant supply channels 60 are constructed in the main body 10, as will be referred to below. Figure 4 , Figure 5 and Figure 6The structure of the coolant supply channel 60 is described in more detail. Although a total of eight such coolant supply channels 60 are shown with respect to the specific exemplary embodiment, corresponding to the number of coolant distribution channels 50 in the tool holder 20, the number of coolant supply channels 60 may be more or less than eight, and in particular, it does not necessarily have to be consistent with the number of coolant distribution channels 50 or the number of bases 25 on the tool holder 20.

[0072] As in Figure 5 As can be seen, in the illustrated embodiment, the coolant supply channel 60 branches off from the through opening 17, through which coolant is introduced into the coolant supply channel from the side of the rotary drive. Figure 4 and Figure 5 As can be seen, in particular, the coolant supply channel 60 opens radially outward from the centering pin 16 and radially inward from the location of the threaded hole 15 at the second end of the body 10. Here, the openings of the coolant supply channel 60 are arranged in a ring-like manner on the outer periphery of the centering pin 16, that is, the openings are arranged in a ring-like manner around the centering pin 16.

[0073] In the annular region of the coolant supply passage 60 opening, a groove 61, deepened relative to the support surface 14, is formed circumferentially around the centering pin 16, as is particularly evident in... Figure 4 and Figure 6 As can be seen in the illustration. In the embodiment specifically shown, the groove 61 is configured as a cavity that deepens radially inward in the direction of the centering pin 16 on the support surface 14, which makes particularly simple manufacturing possible. However, other shapes of the annular circumferential groove 61 are also possible.

[0074] Similarly, Figure 6 As best shown, in the region between the outer peripheral surface 16a and the annular groove 61 constructed in the support surface 14, a circumferential recess 62 is formed on the centering pin 16, resulting in a local reduction in the outer perimeter of the centering pin 16 in this region. In other words, the annular recess is constructed in the region of the centering pin 16 adjacent to the support surface 14 through this circumferential recess 62.

[0075] In the following text, reference will be made to Figures 13 to 21 The interaction between the main body 10 and the tool holder 20, which have an internal coolant supply structure, is described.

[0076] When the tool holder 20 is fastened to the main body 10, the area of ​​the first main surface 21 of the tool holder 20 abuts against the support surface 14 of the main body 10, and the outer peripheral surface 16a of the centering pin 16 seals against the inner peripheral surface 23a of the through opening 23. From the results of observing the accompanying drawings together, Figure 15 , Figure 18 and Figure 21Each section is shown in detail in a plane containing the axis of rotation R, but at different points in the circumferential direction. Figure 15 The details are of the cross-section in the area where there is neither an opening in the coolant supply passage 60 nor an inlet portion 53 of the coolant distribution passage 50. Figure 18 Details of the cross-section in the area where the inlet portion 53 of the coolant distribution channel 50 is located are shown. Figure 21 This is a detail of the cross-section in the area where the coolant supply passage 60 is open.

[0077] As from Figure 15 , Figure 18 and Figure 21 As can be seen together, a coolant distribution chamber 70 is formed in the region between the main body 10 and the tool holder 20. The coolant distribution chamber 70 is formed by the interaction of an annular groove 61 in the support surface 14, a circumferential recess 62 on the centering pin 16, and a recess 55 on the tool holder 20. Therefore, this common coolant distribution channel 70 extends annularly around the rotation axis R or the centering pin 16. Thus, the common coolant distribution chamber 70 has a tool holder side portion formed by the recess 55 on the tool holder 20. A groove 61 with a deepened structure relative to the support surface 14 forms a first main body side portion of the common coolant distribution chamber 70. A circumferential recess 62 on the centering pin 16 forms a second main body side portion of the common coolant distribution chamber 70.

[0078] like Figure 21 As shown, coolant supply channels 60 lead to a common coolant distribution chamber 70, which is formed in this area by recesses 62, grooves 61, and depressions 55. Figure 15 As shown, the coolant can then be distributed circumferentially through the coolant distribution chamber 70. In the area where the inlet portion 53 of each coolant distribution channel 50 is located, coolant can then enter each coolant distribution channel 50 from the common coolant distribution chamber 70, as... Figure 18 As shown.

[0079] During operation of the side end mill 100, coolant is supplied from the first end 11 of the body 10 via the through opening 17 to the coolant supply channel 60. Coolant leakage at the second end 12 via the axial end side of the through opening 17 is prevented by a fastening device (not shown) housed therein for the body on the rotary drive. Coolant is supplied via the coolant supply channel 60 to the common coolant distribution chamber 70, and then distributed circumferentially to the corresponding coolant distribution channels 50. Coolant leakage at the second end 12 between the centering pin 16 and the through opening 23 is prevented by the fact that the inner circumferential surface 23a of the through opening 23 seals against the corresponding outer circumferential surface 16a of the centering pin 16. Coolant is supplied in a targeted manner to the region of the corresponding tool holder 25 via the coolant distribution channel 50 in the tool holder 20.

[0080] Due to the annular structure of the common coolant distribution chamber 70, and because it is radially located inside the threaded hole 15 and the fastening screw 30, the distribution of the inlet portion 53 of the coolant distribution channel 50 around the periphery of the through opening 23 is independent of the number and distribution of the orifices of the coolant supply channel 60 around the centering pin 16. In this way, different tool holders 20 can be used on the same body 10, these tool holders 20 differing from each other, for example, in their outer diameter and / or the number of pins 25 and coolant distribution channels 50.

[0081] Figure 22 and Figure 23 An embodiment of the tool holder that can also be used on the aforementioned body 10 is shown.

[0082] like Figure 22 and Figure 23 As shown, the modified tool holder 20' differs from the tool holder 20 described above in that it has a greater number of tool holders 25 on which the inherent cutting tool inserts 40 are clamped, and correspondingly, a greater number of coolant distribution channels 50. Since the tool holder 20' is otherwise identical to the tool holder 20 described above, the same reference numerals are used, and detailed descriptions of the various features of the cutting tool holder are not repeated.

[0083] Due to the annular structure of the common coolant distribution chamber 70, the modified tool holder 20' can be easily used on the main body 10, so that the tool insert 40 is reliably supplied with coolant.

[0084] Although one embodiment has been described, in which the common coolant distribution chamber 70 has a tool holder side portion (recess 55) and a first body side portion (groove 61) and a second body side portion (recess 62), which makes particularly satisfactory coolant distribution possible while also enabling simple manufacturing, it is also possible, for example, to provide only one or both of these portions. In this case, the coolant can also be distributed on the periphery.

Claims

1. Side end mill (100), with The main body (10), which extends along a predetermined axis of rotation (R) from a first end (11) having an interface for connection to a rotary drive to a free second end (12), on which a support surface (14) for a disc-shaped tool holder (20) is constructed, and A disc-shaped tool holder (20), which is fastened to the second end (12) and supported on the support surface (14) by a first main surface (21) facing the body (10), the outer periphery of the disc-shaped tool holder protrudes radially from the body (10) and has a central through opening (23) axially passing through the disc-shaped tool holder (20). Multiple coolant supply channels (60) for supplying coolant to the second end (12) of the body (10) and are constructed within the body (10). A plurality of coolant distribution channels (50) for supplying coolant to the outer periphery of the disc tool holder (20) and constructed within the disc tool holder (20), and at least two of the plurality of coolant distribution channels (50) branch from a common coolant distribution chamber (70; 55, 61, 62) constructed between the body (10) and the disc tool holder (20), and at least two of the plurality of coolant supply channels (60) lead to the common coolant distribution chamber, wherein each of the coolant distribution channels (50) has a first channel portion (52) extending within the disc tool holder (20), on the side of the first main surface (21) and at the junction with the disc tool holder (20). The first main surface (21) of the disc tool holder (20) has a closed structure on the side opposite to the second main surface (22), and has at least one outlet opening (51) on the outer periphery of the disc tool holder (20), and an inlet portion (53) that leads to the central through opening (23) of the disc tool holder (20) and the first main surface (21), and extends from the first main surface (21) of the disc tool holder (20) only on a portion of the thickness of the disc tool holder (20) in the region of the central through opening (23), and the axial height of the inlet portion (53) leading to the central through opening (23) is at most one-third of the thickness of the disc tool holder (20) at the central through opening (23).

2. The side milling cutter according to claim 1, wherein the common coolant distribution chamber (70; 55, 61, 62) extends in a circumferential manner around the axis of rotation (R).

3. The side milling cutter according to claim 1 or 2, wherein each of the coolant distribution channels (50) has a connecting portion (54) that connects the inlet portion (53) to the first channel portion (52) and has a closed structure in the direction of the central through opening (23) and relative to the second main surface (22).

4. The side milling cutter according to claim 1 or 2, wherein the coolant distribution chamber (70; 55, 61, 62) has a tool holder side portion formed by a recess (55) in the disc tool holder (20), the recess (55) being adjacent to the first main surface (21) and the central through opening (23) and extending between the inlet portions (53) of the respective coolant distribution channels (50).

5. The side milling cutter according to claim 1 or 2, wherein a centering pin (16) protruding axially from the support surface (14) is constructed at the second end (12) of the body (10), and the central through opening (23) in the disc-shaped tool holder (20) is adapted to the outer contour of the centering pin (16).

6. The side milling cutter according to claim 5, wherein the through opening (17) at the second end (12) extends through the centering pin (16).

7. The side milling cutter according to claim 5, wherein the inner circumferential surface (23a) of the central through opening (23) of the disc-shaped tool holder (20) sealably abuts against the outer circumferential surface (16a) of the centering pin (16).

8. The side milling cutter according to claim 5, wherein the plurality of coolant supply channels (60) lead to the common coolant distribution chamber (70; 55, 61, 62) radially outside the centering pin (16).

9. The side milling cutter according to claim 5, wherein the coolant distribution chamber (70; 55, 61, 62) has a first main body side portion formed by a groove (61) extending around the centering pin (16) and has a deepened structure relative to the support surface (14).

10. The side milling cutter according to claim 5, wherein the coolant distribution chamber (70; 55, 61, 62) has a second main body side portion formed by a circumferential recess (62) formed on the centering pin (16).

11. The side milling cutter according to claim 1 or 2, wherein the disc-shaped tool holder (20) has a plurality of tool holders (25) distributed on the periphery of the disc-shaped tool holder (20) for receiving replaceable tool inserts (40).

12. The side milling cutter according to claim 11, wherein the tool holder (25) is configured to receive replaceable tool inserts (40) such that they each project axially from the disc-shaped tool holder (20) on both sides.

13. The side end mill according to claim 11, having a plurality of replaceable cutting inserts (40) secured to the cutter holder (25) and forming the area of ​​the side end mill that protrudes axially furthest from the body (10).

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