CN116833460A - Milling cutter with adjustable cutting width - Google Patents

Abstract

The application provides a milling cutter with adjustable cutting width, which comprises: the cutter head body can rotate around a central axis and is provided with a plurality of mounting parts which are rotationally symmetrical relative to the central axis; each mounting part is provided with a locking surface, a mounting seat surface positioned in front of the locking surface and a stepped hole penetrating through the locking surface and the mounting seat surface; the mounting seat surface is provided with a first guide part; the plurality of tool holders are respectively arranged on the plurality of mounting parts and can adjust positions along the central axis direction; the tool holder is provided with a locking hole and a second guide part; the tool holder is arranged on the mounting seat surface, and the second guide part is connected with the first guide part; and each locking component is correspondingly arranged in the stepped hole of the mounting part, can adjust the position in the stepped hole along the central axis direction, and the tail end of the locking component extends out of the stepped hole and can be connected and locked with the locking hole of the tool holder. The application can improve the position stability of the cutter holder on the cutter head body.

Description

Milling cutter with adjustable cutting width

Technical Field

The application relates to the technical field of cutting tools, in particular to a milling cutter with an adjustable cutting width.

Background

Chinese patent No. CN103894661B discloses a grooving tool with adjustable cutting width, which comprises a rotary tool body capable of rotating along a rotary shaft, and a movable cutting blade capable of adjusting position along the axial direction of the rotary tool body is mounted on the rotary tool body. The grooving tool is characterized in that the grooving tool further comprises a tool holder, a tool holder fastener and a blade fastener, the movable cutting blade is fixed on the tool holder through the blade fastener, more than two tool grooves used for installing the movable cutting blade are formed in the rotary tool body, long holes which are axially arranged along the rotary tool body are formed in the tool holder, the tool holder fastener penetrates through the long holes and is connected with the rotary tool body, a bottom supporting surface and a radial supporting surface are arranged in the tool grooves, a bottom end surface matched with the bottom supporting surface and a radial end surface matched with the radial supporting surface are arranged on the tool holder, a reserved gap is reserved between the radial supporting surface and the radial end surface, a first bulge is arranged on the bottom supporting surface, a first recess is formed in the bottom end surface in a supporting mode, and the first bulge and the first recess are parallel to the axial direction of the rotary tool body.

In the scheme, the tool holder is of an L-shaped structure, the long hole is formed in one side of the L-shaped structure, and the blade is arranged on the other side of the L-shaped structure. The slot and the holder fastener may have relative axial movement for adjusting the axial position of the holder relative to the rotary cutter body, and the holder fastener is coupled to the fastener threaded bore in the rotary cutter body when the axial position of the holder is adjusted to a predetermined position. In this structure, the clamp force of the fastener of the tool holder to the tool holder is concentrated in the position of slot hole, and the tool holder atress is inhomogeneous for the easy perk of another limit of tool holder, that is the position that the blade was installed, leads to processing instability.

Disclosure of Invention

The application aims to provide a milling cutter with adjustable cutting width, which improves machining stability.

In order to solve the technical problems, the application adopts the following technical scheme:

a milling cutter with adjustable cutting width, comprising:

the cutter head body can rotate around a central axis and is provided with a plurality of mounting parts which are arranged at intervals along the circumferential direction and are rotationally symmetrical relative to the central axis; each mounting part is provided with a locking surface, a mounting seat surface positioned in front of the rotation direction of the locking surface and a stepped hole penetrating through the locking surface and the mounting seat surface; the mounting seat surface is provided with a first guide part extending along the central axis direction;

a plurality of tool holders respectively mounted on the plurality of mounting portions and capable of adjusting positions along the central axis direction; one side of the tool holder is used for installing an insert, and the other side of the tool holder is provided with a locking hole and a second guide part extending along the central axis direction; the tool holder is arranged on the mounting seat surface, and the second guide part is connected with the first guide part; and

The locking parts are correspondingly arranged in a stepped hole of the mounting part, the positions of the locking parts can be adjusted in the stepped hole along the central axis direction, and the tail ends of the locking parts extend out of the stepped hole and can be connected and locked with the locking hole of the tool holder.

In some embodiments, the cutterhead body has a first chip surface located forward of the direction of rotation of the mounting portion and a second chip surface located rearward of the direction of rotation of the mounting portion, the first chip surface and the second chip surface being rotationally symmetrical with respect to the central axis; a space for accommodating the tool holder is arranged between the rear end of the first chip surface and the mounting seat surface; the front end of the second chip surface is connected with the locking surface of the mounting part.

In some embodiments, the locking surface of the mounting portion is biased forward of the rotational direction as it moves away from the second chip surface.

In some embodiments, a mounting groove for accommodating the tool holder is further provided between the rear end of the first chip surface and the mounting seat surface, the mounting groove has a connection wall surface opposite to the mounting seat surface and a mounting bottom surface connecting the mounting seat surface and the connection wall surface, the mounting bottom surface is closer to the center of the cutter head body than the rear end of the first chip surface, and the connection wall surface is connected with the rear end of the first chip surface.

In some embodiments, the cutterhead body is further provided with an adjusting hole extending along the central axis direction, and the adjusting hole is adjacent to the installation bottom surface; the milling cutter further comprises an adjusting piece in threaded connection with the adjusting hole, wherein the adjusting piece is provided with a flange protruding out of the mounting bottom surface; the tool holder is provided with an open slot facing the installation bottom surface, and the open slot is clamped with the flange.

In some embodiments, the mounting seat surface is provided with the first guide portions at two sides of the stepped hole, and the second guide portions are provided at two sides of the locking hole of the tool holder.

In some embodiments, the locking member includes a locking bolt threadedly coupled with the toolholder and an elastic member elastically abutting an inner wall of the stepped hole and a head of the locking bolt.

In some embodiments, the stepped bore includes a first step bore, a second step bore, and a third step bore of sequentially decreasing cross-sectional dimensions, the first step bore extending through the locking face, the third step bore extending through the mounting seat face; the head of the locking bolt is accommodated in the first step hole, and the rod part of the locking bolt penetrates out of the third step hole to be connected with the tool holder; the elastic piece is accommodated in the second step hole.

In some embodiments, the resilient member is sleeved on the locking bolt.

In some embodiments, the elastic member is a spring, a rubber boot, or an elastic pad.

According to the technical scheme, the application has at least the following advantages and positive effects: in the milling cutter, the cutter holder is arranged on the mounting part of the cutter head body and is matched with the mounting seat surface, meanwhile, the locking component penetrates through the mounting seat surface to lock the cutter holder, and the locking force of the locking component on the cutter holder and the supporting force of the mounting part on the cutter holder are both applied to the mounting seat surface, so that the cutter holder can be uniformly stressed and firmly locked on the mounting seat surface, the phenomenon of tilting can not occur, and the position stability of the cutter holder on the cutter head body is ensured. Meanwhile, one side of the cutter holder is used for installing the cutter blade, and the other side of the cutter holder is matched with the installation seat surface, so that the cutter blade is subjected to cutting resistance of a workpiece during machining, and acting force applied to the cutter holder by the cutting resistance can be counteracted by supporting force of the installation seat to the cutter holder, so that the position stability of the cutter holder on the cutter head body can be ensured during machining. Based on the position stability of the cutter holder on the cutter head body, the position precision and the processing stability of the cutter blade are correspondingly improved, and the processing quality is improved.

Drawings

Fig. 1 is a perspective view of a milling cutter with adjustable cutting width according to a first embodiment of the present application.

Fig. 2 is a front view of fig. 1.

Fig. 3 is a bottom view of fig. 2.

Fig. 4 is an exploded perspective view of fig. 1 illustrating the construction of one of the cutting elements exploded from the cutterhead body.

Fig. 5 is a partial enlarged view at B in fig. 4.

Fig. 6 is a partial enlarged view at a in fig. 2.

Fig. 7 is a cross-sectional view of C-C in fig. 6.

Fig. 8 is a D-D sectional view of fig. 3.

Fig. 9 is a structural diagram of another modification of fig. 8.

Fig. 10 is a perspective view of a milling cutter with adjustable cutting width according to a second embodiment of the present application.

Fig. 11 is a perspective view of a milling cutter with adjustable cutting width according to a third embodiment of the present application.

The reference numerals are explained as follows:

1. a cutterhead body; 11. a first surface; 12. a second surface; 13. a central bore; 14. a mounting part; 141. a locking surface; 142. a mounting seat surface; 1421. a first guide part; 143. a stepped hole; 1431. a first step hole; 1432. a second step hole; 1433. a third-order hole; 144. an outer peripheral surface; 15. chip removal surface; 1501. a first chip surface; 1502. a second chip surface; 16. a mounting groove; 161. a mounting bottom surface; 162. connecting the wall surfaces; 17. an adjustment aperture; 171. a large end; 172. a small end;

2. a cutting member; 21. a tool holder; 211. a first side; 2111. a fastening groove; 2112. a fastening hole; 212. a second side; 2121. a locking hole; 2122. a second guide part; 213. a third side; 214. a fourth side; 215. an inner end surface; 2151. an open slot; 216. an outer end surface; 22. a blade; 221. a cutting edge; 2211. a main cutting edge; 2212. an auxiliary cutting edge; 222. a through hole; 23. a fastener;

3. a locking member; 31. a locking bolt; 311. a head; 312. a stem portion; 32. an elastic member;

4. an adjusting member; 41. and a flange.

Detailed Description

Exemplary embodiments that embody features and advantages of the present application will be described in detail in the following description. It will be understood that the application is capable of various modifications in various embodiments, all without departing from the scope of the application, and that the description and illustrations herein are intended to be by way of illustration only and not to be construed as limiting the application.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

First embodiment:

referring to fig. 1 to 9, the present embodiment provides a milling cutter (hereinafter referred to as "milling cutter") with an adjustable cutting width, which mainly includes a cutter head body 1, a plurality of cutting members 2 removably mounted on the cutter head body 1, and a plurality of locking members 3 respectively locking the cutting members 2.

The cutter head body 1 of the milling cutter can be arranged on a machine tool spindle (not shown in the figure) to rotate along with the machine tool spindle, a workpiece (not shown in the figure) is grooved by the cutting component 2, and grooves with different widths can be processed by adjusting the position of the cutting component 2 on the cutter head body 1. The milling cutter of the present embodiment further comprises an adjustment member 4 for adjusting the position of the cutting member 2.

Referring to fig. 1 to 3, the cutterhead body 1 is disc-shaped and has a first surface 11 and a second surface 12 opposite to each other, and the first surface 11 and the second surface 12 are parallel. The centre of the cutterhead body 1 has a central bore 13 through the first surface 11 and the second surface 12 for mounting on a machine spindle, the central axis L of the central bore 13 being coaxial with the machine spindle. Accordingly, the central axis L of the central hole 13 constitutes a rotation axis when the cutterhead body 1 rotates with the main spindle of the machine tool.

The cutterhead body 1 has a plurality of mounting portions 14 provided at intervals in the circumferential direction, and the plurality of mounting portions 14 are rotationally symmetrical with respect to the central axis L. Six mounting portions 14 are illustrated, the six mounting portions 14 being evenly distributed with respect to the central axis L. In other not-shown structures, the number of the mounting portions 14 may be set to other, for example, four, eight, or the like.

Between two adjacent mounting portions 14 there is a chip surface 15 recessed in the direction of the central bore 13, which chip surface 15 defines a chip space between the two mounting portions 14. For a cutterhead body 1 with six mounting portions 14, the chip surfaces 15, respectively, have six chip surfaces 15, which are likewise rotationally symmetrical with respect to the central axis L. In this embodiment, the chip surface 15 is an arc surface, and the center of the arc is located in the interval between the two mounting portions 14. In other embodiments not shown, the chip surface 15 may be other forms of curved surfaces, a plurality of abutting flat surfaces, a plurality of abutting curved surfaces, a combination of flat and curved surfaces, or the like.

Hereinafter, the structure of one of the mounting portions 14 will be described specifically, and for convenience of description, the chip surface 15 located at the front in the rotation direction of the mounting portion 14 will be referred to as a first chip surface 1501, and the chip surface 15 located at the rear in the rotation direction of the mounting portion 14 will be referred to as a second chip surface 1502. It should be noted that, the first chip surface 1501 and the second chip surface 1502 have substantially the same structure, and the first chip surface 1501 and the second chip surface 1502 are rotationally symmetrical with respect to the central axis L, and the distinction of "first" and "second" with respect to the chip surface 15 is merely for convenience in description.

The rotation direction refers to the rotation direction of the milling cutter during processing, and in fig. 1 and 3, the rotation direction of the milling cutter is shown by the arc lines with arrows, and the milling cutter rotates counterclockwise during processing according to the view direction shown in fig. 1 and 3. Unless otherwise indicated, references to directions of rotation are used hereinafter to refer to directions of "front" and "rear" of a structure.

As shown in fig. 3, the mounting portion 14 has a locking surface 141, a mounting seat surface 142 located forward of the rotational direction of the locking surface 141, an outer peripheral surface 144 connecting the locking surface 141 and the mounting seat surface 142, and a stepped hole 143 penetrating the locking surface 141 and the mounting seat surface 142. The locking surface 141, the mounting surface 142 and the outer circumferential surface 144 are all connected between the first surface 11 and the second surface 12. The locking surface 141 and the mounting surface 142 are spaced apart, the locking surface 141 is located on a side facing the second chip surface 1502, the mounting surface 142 is located on a side facing the first chip surface 1501, the outer circumferential surface 144 is an arc surface centered on the central axis L, and both ends of the outer circumferential surface 144 are respectively connected to an end of the locking surface 141 and an end of the mounting surface 142. The outer circumferential surfaces 144 of the plurality of mounting portions 14 are located on the same circular surface.

The locking surface 141 meets the front end of the second chip surface 1502, and the locking surface 141 together with the second chip surface 1502 serves as a boundary surface for the chip space. In the present embodiment, the locking surface 141 is planar and is biased toward the front in the rotational direction as it goes away from the second chip surface 1502, i.e., the locking surface 141 extends obliquely forward in the direction from the second chip surface 1502 to the outer peripheral surface 144. This arrangement of the locking surface 141 makes the chip space larger and more advantageous for the extraction of chips. The locking surface 141 is not limited to a flat surface, and may be a curved surface.

Referring to fig. 4 and 5, the mounting surface 142 is provided for mounting the cutting member 2. The mount surface 142 is provided with a first guide portion 1421 extending in the direction of the central axis L. The middle area of the mounting surface 142 is planar, and the stepped hole 143 penetrates the middle area of the mounting surface 142. The mounting seat surface 142 is provided with first guide portions 1421 on both sides of the stepped hole 143. In this embodiment, the first guiding portion 1421 includes a plurality of grooves extending along the central axis L, and the plurality of grooves are arranged side by side, so that a tooth structure is formed on the mounting surface 142. The cross section of the groove is approximately triangular. In other constructions, not shown, the grooves may also be rectangular, trapezoidal, etc. in cross-section. In some embodiments, not shown, the first guiding portion 1421 may be just one groove, and the cross section of the groove may be rectangular, trapezoidal, or the like. The first guide portion 1421 may be a plane extending in the direction of the central axis L, and the mount surface 142 may be a plane as a whole. In addition, the middle region of the mount surface 142 is not limited to be a plane, but may be formed as a tooth surface, so that the mount surface 142 may have a tooth structure as a whole.

The mounting surface 142 is spaced from the rear end of the first chip surface 1501 to accommodate the cutting member 2. Namely: when the cutting member 2 is mounted on the mounting surface 142, the cutting member 2 will abut against the first chip surface 1501, and chips generated by cutting the cutting member 2 can be discharged easily under the guidance of the first chip surface 1501.

In this embodiment, a mounting groove 16 for receiving the cutting member 2 is preferably further provided between the mounting seat surface 142 and the rear end of the first chip surface 1501. The mounting groove 16 has a connection wall surface 162 facing the mounting seat surface 142, and a mounting bottom surface 161 connecting the mounting seat surface 142 and the connection wall surface 162. The mounting surface 161 is closer to the center of the cutterhead body 1 than the rear end of the first chip surface 1501, the mounting surface 161 defining a location where the mounting slot 16 is closest to the center of the cutterhead body 1. The connecting wall surface 162 is opposite the mounting seat surface 142, both defining the width of the mounting slot 16. By providing the mounting groove 16, the side wall of the mounting groove 16, i.e. the connecting wall surface 162, serves as a stop for the cutting member 2, preventing the cutting member 2 from flying out in an unexpected situation. Meanwhile, the mounting seat surface 142 has a larger length along the radial direction of the cutter head body 1, which is beneficial to the connection and the matching of the mounting seat surface 142 and the cutting part 2. In addition, in some embodiments, not shown, the mounting base surface 161 may also be configured to cooperate with the mounting base surface 142 to assist in positioning the cutting member 2.

In other embodiments, not shown, the mounting slot 16 may be eliminated and the mounting floor 161 may be directly contiguous with the first chip surface 1501.

In this embodiment, the cutter head body 1 is further provided with a plurality of adjustment holes 17 extending in the direction of the central axis L, and the number of adjustment holes 17 corresponds to the number of mounting portions 14. Each adjustment hole 17 is adjacent to the mounting bottom surface 161 of the mounting portion 14 and is located on a side of the mounting bottom surface 161 that is adjacent to the central hole 13. Specifically, each adjusting hole 17 is a counter bore, a large end 171 of the adjusting hole 17 is located on the first surface 11, a side portion of the large end 171 of the adjusting hole 17 is communicated with the mounting groove 16, and a small end 172 of the adjusting hole 17 is provided with an internal thread.

Referring to fig. 6, in the present embodiment, the cross section of the stepped hole 143 has a waist shape extending in the direction of the central axis L so that the locking member 3 can be adjusted in position in the direction of the central axis L in the stepped hole 143. The waist shape of the stepped hole 143 may be an ellipse, a long bar shape, or the like, and the dimension of the stepped hole 143 in the direction along the central axis L may be larger than the dimension of the locking member 3 in the direction along the central axis L.

Referring again to fig. 7, the stepped hole 143 includes a first stepped hole 1431, a second stepped hole 1432, and a third stepped hole 1433 having a sectional size decreasing in order, as viewed in a direction from the locking surface 141 to the mounting surface 142, the first stepped hole 1431 penetrating the locking surface 141, and the third stepped hole 1433 penetrating the mounting surface 142.

The cross-sectional dimension may be understood as a characteristic dimension of the cross-sectional shape, and taking the cross-section of the first-stage hole 1431, the second-stage hole 1432, and the third-stage hole 1433 as examples, the cross-sectional dimension may be understood as a length, a width, or an area of the waist-shaped hole extending along the central axis L. If the cross-sections of the first, second, and third order holes 1431, 1432, 1433 are elliptical holes whose long axes extend in the direction of the central axis L, the cross-sectional dimensions of the holes can be understood as the long axes, the short axes, or the areas of the elliptical holes. When the first, second and third stepped holes 1431, 1432 and 1433 are holes of other shapes, the meaning of the cross-sectional dimension can be understood with reference to the above examples of the waist-shaped holes and the elliptical holes. Due to the difference in cross-sectional dimensions, a step is formed between the first and second stepped bores 1431, 1432 and a step is formed between the second and third stepped bores 1432, 1433, respectively.

As described above, each mounting portion 14 of the cutterhead body 1 has the same structure, and the description of the structure of other mounting portions 14 will not be repeated.

Referring next to fig. 4, 5 and 7, the cutting member 2 includes a holder 21, an insert 22 mounted on the holder 21, and a fastener 23 for fastening the insert 22.

The holder 21 is generally rectangular and block-shaped having a first side 211, a second side 212 opposite the first side 211, opposite third and fourth sides 213, 214 connected between the first and second sides 211, 212, and opposite inner and outer end surfaces 215, 216 connected between the first and second sides 211, 212.

The first side surface 211 is provided with a fastening groove 2111 for mounting the blade 22, and the fastening groove 2111 penetrates the outer end surface 216, the third side surface 213, and the fourth side surface 214. The fastening groove 2111 is adapted to the shape of the blade 22 to restrain the blade 22 therein, and the fastening groove 2111 is provided therein with a fastening hole 2112 for the fastening piece 23 to be connected.

The second side surface 212 is configured to be mounted in cooperation with the mounting seat surface 142 of the cutterhead body 1. The second side surface 212 is provided with a locking hole 2121 and a second guide 2122 extending in the direction of the central axis L. The middle region of the second side 212, i.e., the region where the locking hole 2121 is located, is planar and is adapted to the shape of the middle region of the mounting surface 142. The second guide portions 2122 are provided on both sides of the locking hole 2121, respectively. The second guide portion 2122 is configured to be in contact with the first guide portion 1421 of the mounting surface 142, and the second guide portion 2122 is configured to be adapted to the first guide portion 1421, in this embodiment, the second guide portion 2122 is a plurality of protrusions arranged in parallel, and these protrusions are combined to form a tooth shape, and the cross section of the protrusions is substantially triangular. Corresponding to other configurations of the mounting surface 142 and its first guide portion 1421, the second side surface 212 and its second guide portion 2122 may be configured as a variety of modifications.

The holder 21 is mounted on the mounting portion 14 of the cutterhead body 1, specifically, the second side 212 of the holder 21 is mounted on the mounting seat surface 142, the inner end of the holder 21 is received in the mounting groove 16, the inner end surface 215 of the holder 21 is opposite to the mounting bottom surface 161, the first side 211 of the holder 21 is opposite to the connecting wall surface 162, the third side 213 of the holder 21 is adjacent to the first surface 11, and the fourth side 214 is adjacent to the second surface 12. The tool holder 21 can be adjusted in position along the central axis L with respect to the cutterhead body 1, and the second guide portion 2122 extending along the central axis L cooperates with the first guide portion 1421 on the cutterhead body 1 to provide a guiding function when the tool holder 21 is adjusted in position.

It should be noted that, a gap is formed between the first side 211 of the holder 21 and the connecting wall 162, so as to adjust the position of the holder 21 relative to the cutterhead body 1. In this embodiment, since the first guide portion 1421 and the second guide portion 2122 are configured to have the protrusion and the groove engaged with each other, the structure can radially position the holder 21, and when the holder 21 is received in the mounting groove 16, a gap is provided between the inner end surface 215 of the holder 21 and the mounting bottom surface 161. In other arrangements not shown, if the first guide portion 1421 and the second guide portion 2122 are configured to mate with each other in a planar manner, the inner end surface 215 of the toolholder 21 may be adapted to engage the mounting bottom surface 161 to locate the radial position of the toolholder 21 via the mounting bottom surface 161.

In this embodiment, the insert 22 may be used in an indexable manner, and a plurality of cutting edges 221 are formed on the ridge line of the outer periphery thereof. The insert 22 is centrally provided with a through hole 222 for the fastener 23 to pass through to secure the insert 22 in the fastening groove 2111 of the toolholder 21. The fastener 23 may be a screw or bolt, or the like.

When the insert 22 is mounted to the toolholder 21, one of the cutting edges 221 protrudes beyond the toolholder 21 for cutting operations. In this embodiment, each cutting edge 221 includes a main cutting edge 2211 and a pair of cutting edges 2212 connected to the main cutting edge 2211 at one side of the main cutting edge 2211. The major cutting edge 2211 protrudes from the outer end surface 216 of the holder 21 and the minor cutting edge 2212 protrudes from the third side surface 213 or the fourth side surface 214 of the holder 21.

In other constructions, not shown, the cutting edge 221 of the insert 22 may further include a primary cutting edge 2211 and two secondary cutting edges 2212 located on opposite sides of the primary cutting edge 2211, the two secondary cutting edges 2212 protruding from the third and fourth sides 213, 214, respectively, of the toolholder 21.

The specific structure of the blade 22 may be set according to practical situations, and is not limited herein.

As shown in fig. 3, 4 and 7, and referring mainly to fig. 7, the locking member 3 is correspondingly installed in the stepped hole 143 of the mounting portion 14, and is capable of adjusting the position in the central axis L direction in the stepped hole 143. The distal end of the locking member 3 protrudes through the stepped hole 143 and can be coupled and locked with the locking hole 2121 of the holder 21, thereby locking the position of the holder 21 on the mounting portion 14.

In the present embodiment, the locking member 3 includes a locking bolt 31 and an elastic member 32. The diameters of the lock bolt 31 and the elastic member 32 are smaller than the length of the stepped hole 143 in the direction of the central axis L, so that the positions of the stepped hole 143 can be adjusted in the direction of the central axis L.

The head 311 of the lock bolt 31 is received in the first stepped bore 1431 of the stepped bore 143, the shank 312 of the lock bolt 31 passes through the second and third stepped bores 1432, 1433, and the distal end of the shank 312 of the lock bolt 31 passes outwardly through the third stepped bore 1433 to be threadedly coupled with the lock bore 2121 of the holder 21. When the head 311 of the lock bolt 31 abuts the step between the first stepped bore 1431 and the second stepped bore 1432 and the second side 212 of the toolholder 21 abuts the mounting face 142 of the mounting portion 14, the locking force between the lock bolt 31 and the toolholder 21 will prevent the lock bolt 31 from moving in the stepped bore 143 in the direction of the central axis L, thereby locking the position of the toolholder 21 on the mounting portion 14.

The elastic member 32 of the present embodiment is a spring, and is sleeved on the locking bolt 31. The elastic member 32 is accommodated in the second step hole 1432, and both ends of the elastic member 32 elastically abut against the inner wall of the stepped hole 143 and the head 311 of the locking bolt 31, respectively. In other embodiments not shown, the elastic member 32 may also be a rubber boot, an elastic pad, or the like.

The elastic member 32 provides elastic force in the axial direction of the stepped hole 143. When the locking bolt 31 locks the tool holder 21, the elastic member 32 is compressed by the head 311 of the locking bolt 31 and the inner wall of the stepped hole 143, and the elastic resilience of the elastic member 32 tends to move the locking bolt 31 backward, so that the tool holder 21 is pulled to the mounting seat surface 142, and the stability of mounting the tool holder 21 on the cutter head body 1 is improved. When the position of the tool holder 21 needs to be adjusted, the locking bolt 31 is unscrewed, and at this time, the tool holder 21 is still pressed close to the mounting seat surface 142 under the elastic force of the elastic member 32, so that the position of the tool holder is not changed with the mounting seat surface 142 immediately due to the loss of the locking force of the locking bolt 31. Because the elastic force provided by the elastic member 32 is smaller than the locking force of the locking bolt 31, the position of the tool holder 21 along the axial direction of the cutter head body 1 can be adjusted after the acting force along the axial direction of the cutter head body 1 is applied. After the tool holder 21 moves to a predetermined position, the locking bolt 31 is locked, during the locking operation, due to the existence of the elastic force of the elastic member 32, the tiny movement of the tool holder 21 under the action of the locking force can be reduced, and when the elastic force is large enough, the tiny movement of the tool holder 21 can be basically eliminated, so that the accuracy of position adjustment of the tool holder 21 on the cutter head body 1 is further improved by utilizing the elastic member 32.

Referring to fig. 8 and 9, in this embodiment, the adjusting member 4 is matched with the adjusting hole 17 on the cutter head body 1 and the matching structure on the cutter holder 21, so that the accuracy of adjusting the position of the cutter holder 21 can be further improved.

Specifically, the inner end surface 215 of the holder 21 is provided with an open groove 2151, and the open groove 2151 communicates with the adjustment hole 17.

The adjusting piece 4 is provided with threads, so that the adjusting piece 4 is in threaded connection with the adjusting hole 17 of the cutter head body 1, and the position of the adjusting piece 4 can be adjusted along the direction of the central axis L by adjusting the threaded connection length of the adjusting piece 4 and the adjusting hole 17. The adjustment member 4 has a protruding flange 41, which flange 41 is in the large end 171 of the adjustment hole 17 and protrudes beyond the mounting bottom surface 161. The flange 41 is engaged with the open groove 2151 of the holder 21, thereby adjusting the position of the holder 21 in the direction of the central axis L. Since the pitch of the screw thread of the adjusting member 4 is known, when the adjusting member 4 is rotated one turn, i.e., moved by one pitch distance in the direction of the central axis L, the adjustment of the predetermined size can be precisely achieved, and the adjustment manner is simple and convenient.

The shape of the flange 41 and the open groove 2151 may be varied, for example, in the structure shown in fig. 8, the cross sections of the flange 41 and the open groove 2151 are triangular, and in the structure shown in fig. 9, the cross sections of the flange 41 and the open groove 2151 are rectangular.

The adjusting member 4 may be a screw, a bolt, or the like, and the head of the screw or the bolt may constitute the flange 41. The adjustment member 4 may be of other constructions having threads and a flange 41.

Based on the above description of each structural member, the assembly process and the working principle of the milling cutter of this embodiment are as follows:

mounting the insert 22 in the fastening groove 2111 of the holder 21 by means of a fastener 23 to form an integral cutting member 2; the cutting member 2 is mounted on the mounting portion 14 of the cutterhead body 1, the cutter holder 21 is mounted in cooperation with the mounting seat surface 142 of the mounting portion 14, the second guide portion 2122 is connected with the first guide portion 1421, and the locking hole 2121 is opposite to the stepped hole 143; the elastic piece 32 is sleeved on the locking bolt 31, the locking bolt 31 is installed into the stepped hole 143 from one side of the locking surface 141, and the tail end of the locking bolt 31 extends into the locking hole 2121; the axial position of the holder 21 relative to the mounting portion 14 is adjusted by the adjuster 4 according to actual needs, and the locking bolt 31 is locked after the adjustment is in place. When the axial position of the tool holder 21 relative to the mounting portion 14 is adjusted, the tool holder 21 and the mounting portion 14 can be guaranteed to move relatively only along the direction of the central axis L by matching the first guide portion 1421 and the second guide portion 2122, and cannot rotate relatively or move relatively along the radial direction of the cutterhead body 1.

Referring back to fig. 1 and 2, as a whole, the plurality of cutting members 2 are mounted on the plurality of mounting portions 14, respectively, wherein the minor cutting edges 2212 of the inserts 22 of one portion of the cutting members 2 are located on one side of the first surface 11 and the minor cutting edges 2212 of the inserts 22 of the other portion of the mounting portions 14 are located on one side of the second surface 12. For example, as shown in fig. 2, the minor cutting edges 2212 of the blades 22 mounted on two adjacent mounting portions 14 face different sides in the present embodiment, wherein the minor cutting edge 2212 of the blade 22 on one mounting portion 14 axially extends beyond the first surface 11, and the minor cutting edge 2212 of the blade 22 on the other mounting portion 14 axially extends beyond the second surface 12.

The pitch of the secondary cutting edges 2212 along the central axis L defines the groove width W of the milling cutter for grooving the workpiece. By adjusting the axial position of the holder 21 relative to the mounting portion 14, the distance between the secondary cutting edge 2212 of the insert 22 relative to the first surface 11 or the second surface 12 will be correspondingly changed, thereby correspondingly adjusting the groove width of the grooving process to meet the machining requirements.

Based on the above description, according to the structure of the milling cutter of the present embodiment, the holder 21 of the cutting member 2 is mounted on the mounting portion 14 of the cutter head body 1 to cooperate with the mounting seat surface 142, and at the same time, the locking member 3 passes through the mounting seat surface 142 to lock the holder 21, and both the locking force of the locking member 3 to the holder 21 and the supporting force of the mounting portion 14 to the holder 21 act on the mounting seat surface 142, so that the holder 21 can be uniformly and firmly locked on the mounting seat surface 142 without occurrence of a tilting phenomenon, and the positional stability of the holder 21 on the cutter head body 1 is ensured. Meanwhile, the insert 22 is mounted on the first side 211 of the holder 21, and the second side 212 opposite to the first side 211 is matched with the mounting seat surface 142, so that the insert 22 is subjected to the cutting resistance of the workpiece during processing, and the acting force applied to the holder 21 by the cutting resistance can be counteracted by the supporting force of the mounting seat surface 142 on the holder 21, so that the position stability of the holder 21 on the cutterhead body 1 can be ensured during processing. Based on the position stability of the cutter holder 21 on the cutter head body 1, the position precision and the processing stability of the cutter blade 22 are correspondingly improved, and the processing quality is improved.

Further, since the cutting member 2 is mounted in cooperation with the mounting seat surface 142 of the mounting portion 14, the cutting member 2 occupies only a small space between two adjacent mounting portions 14, so that for the cutting member 2, the space between two adjacent mounting portions 14 can have a large space for chip removal, which is beneficial to smooth discharge of chips and ensures smooth machining process.

Second embodiment:

referring to fig. 10, the milling cutter of the present embodiment differs from the first embodiment in that: the adjustment members 4 are arranged in different ways.

In this embodiment, three adjusting members 4 are mounted on the cutterhead body 1 from the first surface 11, and the secondary cutting edges 2212 of three cutting members 2 corresponding to the three adjusting members 4 are located at one side of the second surface; three further adjustment members, not shown in the figures, are mounted on the second surface, and the secondary cutting edges 2212 of the three cutting members 2 corresponding to the three adjustment members mounted on the second surface are located on one side of the first surface 11. In this arrangement, the six cutting members 2 may be aligned in groups, and for example, the axial positions of the corresponding three cutting members 2 on the cutter head body 1 may be aligned from the first surface 11, and then the axial positions of the other three cutting members 2 on the cutter head body 1 may be aligned from the second surface.

Other features of the milling cutter in this embodiment may refer to the first embodiment, and will not be described in detail.

Third embodiment:

referring to fig. 11, the milling cutter of the present embodiment differs from the first embodiment in that: in this embodiment, no adjusting member is provided, and accordingly, no adjusting hole is provided in the cutterhead body 1, and no open slot is provided in the holder 21 of the cutting member 2.

In this structure, the position adjustment of the tool holder 21 on the cutter head body 1 can be achieved by manually moving the tool holder 21, and the position accuracy of the tool holder 21 can be ensured by means of a tool table, a measuring instrument or other tools.

Other features of the milling cutter in this embodiment may refer to the first embodiment, and will not be described in detail.

While the application has been described with reference to several exemplary embodiments, it is to be understood that the terminology used is intended to be in the nature of words of description and of limitation. As the present application may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims (10)

1. A milling cutter with adjustable cutting width, comprising:

the cutter head body can rotate around a central axis and is provided with a plurality of mounting parts which are arranged at intervals along the circumferential direction and are rotationally symmetrical relative to the central axis; each mounting part is provided with a locking surface, a mounting seat surface positioned in front of the rotation direction of the locking surface and a stepped hole penetrating through the locking surface and the mounting seat surface; the mounting seat surface is provided with a first guide part extending along the central axis direction;

a plurality of tool holders respectively mounted on the plurality of mounting portions and capable of adjusting positions along the central axis direction; one side of the tool holder is used for installing an insert, and the other side of the tool holder is provided with a locking hole and a second guide part extending along the central axis direction; the tool holder is arranged on the mounting seat surface, and the second guide part is connected with the first guide part; and

The locking parts are correspondingly arranged in a stepped hole of the mounting part, the positions of the locking parts can be adjusted in the stepped hole along the central axis direction, and the tail ends of the locking parts extend out of the stepped hole and can be connected and locked with the locking hole of the tool holder.

2. The milling cutter of claim 1, wherein the cutterhead body has a first chip surface located forward of the direction of rotation of the mounting portion and a second chip surface located rearward of the direction of rotation of the mounting portion, the first chip surface and the second chip surface being rotationally symmetrical with respect to the central axis; a space for accommodating the tool holder is arranged between the rear end of the first chip surface and the mounting seat surface; the front end of the second chip surface is connected with the locking surface of the mounting part.

3. The milling cutter according to claim 2, wherein the locking surface of the mounting portion is biased forward of the rotational direction as it is away from the second chip surface.

4. The milling cutter of claim 2, wherein a mounting groove for receiving the holder is further provided between the rear end of the first chip surface and the mounting seat surface, the mounting groove having a connecting wall surface opposite to the mounting seat surface and a mounting bottom surface connecting the mounting seat surface and the connecting wall surface, the mounting bottom surface being closer to the center of the cutter head body than the rear end of the first chip surface, the connecting wall surface being contiguous with the rear end of the first chip surface.

5. The milling cutter according to claim 4, wherein the cutter head body is further provided with an adjustment hole extending in the direction of the central axis, the adjustment hole being adjacent to the mounting bottom surface; the milling cutter further comprises an adjusting piece in threaded connection with the adjusting hole, wherein the adjusting piece is provided with a flange protruding out of the mounting bottom surface; the tool holder is provided with an open slot facing the installation bottom surface, and the open slot is clamped with the flange.

6. The milling cutter according to claim 1, wherein the mounting seat surface is provided with the first guide portions on both sides of the stepped hole, and the locking hole of the holder is provided with the second guide portions on both sides thereof.

7. The milling cutter according to any one of claims 1 to 6, wherein the locking member comprises a locking bolt threadedly coupled with the holder, and a resilient member resiliently abutting an inner wall of the stepped bore and a head of the locking bolt.

8. The milling cutter of claim 7, wherein the stepped bore comprises a first step bore, a second step bore, and a third step bore of successively decreasing cross-sectional dimensions, the first step bore extending through the locking face and the third step bore extending through the mounting seat face; the head of the locking bolt is accommodated in the first step hole, and the rod part of the locking bolt penetrates out of the third step hole to be connected with the tool holder; the elastic piece is accommodated in the second step hole.

9. The milling cutter of claim 8, wherein the resilient member is sleeved on the locking bolt.

10. The milling cutter according to claim 9, wherein the resilient member is a spring, a rubber sleeve or a resilient shim.