Adjustable milling cutter head

Abstract

The adjustable milling cutter head comprises a cutter disc and a blade arranged on the cutter disc, the top of the cutter disc is provided with a mounting plate for mounting an adjusting mechanism for adjusting the height of the blade, and a gap is arranged between the mounting plate and the cutter disc. The principle of the present application is that the mounting plate is arranged on the top surface of the cutter disc, and the adjusting mechanism is arranged on the mounting plate, so that the structure is convenient to implement; and the mounting plate is added, so that the mounting and implementation of the adjusting mechanism are facilitated.

Description

Technical Field

[0001] This invention relates to the field of metal cutting, and in particular to an adjustable milling cutter head. Background Technology

[0002] Milling heads typically have several cutting inserts on the circumference of the cutter head for cutting the workpiece. As the cutter head rotates, each insert must mill the workpiece, ensuring even force distribution across all inserts. However, in actual operation, due to uneven hardness across different parts of the workpiece, or wear of the inserts after prolonged milling, the height of the inserts extending beyond the cutter head varies. This results in higher inserts receiving more cutting force, while lower inserts receive less. This uneven force distribution burdens the machine tool, reduces the lifespan of the milling cutter, and decreases the smoothness of the machined workpiece surface. To address the issue of inconsistent cutter head heights on the same cutter head, milling cutter devices capable of adjusting insert height have emerged. For example, Chinese Patent Publication No. CN103008748A describes a milling cutter device with adjustable insert height, comprising a cutter head body with a drive shaft hole at its center. At least one tool holder groove is cut inwardly on the circumferential surface of the cutter head body, extending to the side of the cutter head body. A tool holder is installed within the tool holder groove, and a chip removal ramp is provided corresponding to the tool holder. An insert is fixed on the tool holder, with the insert portion extending beyond the circumferential surface. The tool holder is equipped with a height adjustment screw for adjusting the insert height. While adjusting the insert height via the screw achieves the desired height adjustment, the structure is complex, requiring modifications to the cutter head or inserts to varying degrees, making implementation cumbersome. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an adjustable milling cutter head, with a simple adjustment mechanism that is easy to implement.

[0004] To solve the above-mentioned technical problems, the technical solution of the present invention is: an adjustable milling cutter head, including a cutter head and a cutting blade disposed on the cutter head, wherein the top of the cutter head is provided with a mounting plate for mounting an adjustment mechanism for adjusting the height of the cutting blade, and a gap is provided between the mounting plate and the cutter head. The principle of the invention: the mounting plate is disposed on the top surface of the cutter head, and the adjustment mechanism is disposed on the mounting plate; this structure is convenient to implement; by adding a mounting plate, the installation and implementation of the adjustment mechanism can be facilitated.

[0005] As an improvement, the cutter head and mounting plate are locked to the spindle by a first fixing bolt.

[0006] As an improvement, a boss is provided in the middle of the top surface of the cutter head, the boss abutting against the bottom surface of the mounting plate, and the first fixing bolt passes through the boss.

[0007] As an improvement, the bottom surface of the mounting plate is provided with a groove at the corresponding protrusion.

[0008] As an improvement, the mounting plate and the cutter head are an integral structure, and the cutter head is locked to the spindle by the first fixing bolt. The gap is formed by cutting.

[0009] As an improvement, the mounting plate is a disc, and the diameter of the mounting plate is the same as the diameter of the cutter head.

[0010] As an improvement, the adjustment mechanism includes a plurality of first adjustment bolts evenly distributed around the circumference of the mounting plate, the first adjustment bolts passing through the threaded holes of the mounting plate and abutting against the top surface of the cutter head.

[0011] As an improvement, a second adjusting bolt is provided on one side of the first adjusting bolt on the mounting plate. The second adjusting bolt passes through the mounting plate and is threadedly connected to the cutter head. A third adjusting bolt is provided between the cutter head and the mounting plate. The third adjusting bolt passes through the cutter head and is threadedly connected to the mounting plate.

[0012] As an improvement, the adjusting mechanism includes a first threaded rod threadedly connected to a cutter bar mounted on the cutter head, a first nut fitted on the first threaded rod and capable of pressing the cutter bar, a first threaded sleeve disposed in a mounting hole in the mounting plate, a second threaded sleeve passing through and threadedly engaged with the first threaded sleeve, a pressure plate for pressing the first threaded sleeve, and a second nut fitted on the threaded rod and capable of pressing the second threaded sleeve; the second threaded rod passes through the second threaded sleeve, the second threaded sleeve including a rotating head and a threaded portion, the threaded portion passing through the first threaded sleeve, and a pressure pad provided between the rotating head and the pressure plate.

[0013] As an improvement, the adjusting mechanism includes a second threaded rod threadedly connected to a tool holder mounted on the cutter head, a third nut fitted on the second threaded rod and capable of pressing the tool holder, a third threaded sleeve disposed in a mounting hole in the mounting plate, a second pressure plate for pressing the third threaded sleeve, and a fourth nut fitted on the second threaded rod and capable of pressing the third threaded sleeve; the second threaded rod includes an upper threaded section and a lower threaded section, the threads of the upper threaded section and the lower threaded section having the same thread direction, the tool holder and the third nut being threadedly connected to the lower threaded section respectively, and the third threaded sleeve and the fourth nut being threadedly connected to the upper threaded section respectively.

[0014] As an improvement, the adjustment mechanism includes a third threaded rod, a fourth threaded sleeve fitted on the third threaded rod, a fifth nut fitted on the third threaded rod and located above the fourth threaded sleeve, a sixth nut fitted on the fourth threaded sleeve and located above the mounting plate, and a seventh nut fitted on the third threaded rod and located between the mounting plate and the cutter head; the fourth threaded sleeve is threadedly connected to the mounting plate and the cutter head respectively.

[0015] The beneficial effects of this invention compared to the prior art are:

[0016] The mounting plate is located on the top surface of the cutter head, and the adjustment mechanism is located on the mounting plate. This structure is easy to implement; by adding the mounting plate, the installation and implementation of the adjustment machine can be facilitated. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the connection between the large-size cutter head and the spindle in Example 1.

[0018] Figure 2 This is a top view of the mounting plate for the large-size cutter head in Example 1.

[0019] Figure 3 This is a schematic diagram of the connection between the small-sized cutter head and the spindle in Example 1.

[0020] Figure 4 This is a top view of the mounting plate for the small-sized cutter head in Example 1.

[0021] Figure 5 This is a schematic diagram of the connection between the cutter head and the spindle in Example 2.

[0022] Figure 6 This is a schematic diagram of the adjustment mechanism in Example 2.

[0023] Figure 7 This is a schematic diagram of the connection between the cutter head and the spindle in Example 3.

[0024] Figure 8 This is a schematic diagram of the adjustment mechanism in Example 3.

[0025] Figure 9 This is a schematic diagram of the connection between the cutter head and the spindle in Example 4.

[0026] Figure 10 This is a schematic diagram of the adjustment mechanism in Example 4.

[0027] Figure 11 This is a top view of the mounting plate for a small cutter head.

[0028] Figure 12 This is a schematic diagram showing the connection between a large-size tool turret and the spindle. Implementation

[0029] The present invention will now be further described with reference to the accompanying drawings. Example

[0030] like Figure 1 , 3 As shown, an adjustable milling cutter head includes a cutter head 3 and a cutting blade disposed on the cutter head 3. The top of the cutter head 3 is provided with a mounting plate 2 for mounting an adjustment mechanism 4 for adjusting the height of the cutting blade. There is a gap between the mounting plate 2 and the cutter head 3. The mounting plate 2 is a disc, and the diameter of the mounting plate 2 is the same as the diameter of the cutter head 3.

[0031] likeFigure 1 , 3 As shown, the cutter head 3 and the mounting plate 2 are independent components. The cutter head 3 and the mounting plate 2 are locked to the spindle by the first fixing bolt 5. A boss is provided in the middle of the top surface of the cutter head 3, and a groove is provided on the bottom surface of the mounting plate 2 corresponding to the boss. The boss abuts against the bottom surface of the mounting plate 2, and the first fixing bolt 5 passes through the boss.

[0032] The mounting plate 2 and the cutter head 3 are an integral structure. The cutter head 3 is locked to the spindle by the first fixing bolt 5, and the gap is formed by cutting.

[0033] like Figures 1 to 4 As shown, the adjustment mechanism 4 includes several first adjusting bolts 4 evenly distributed circumferentially on the mounting plate 2. The first adjusting bolts 41 pass through the mounting plate 2 and abut against the top surface of the cutter head 3. A third screw hole is provided on the mounting plate 2 corresponding to the position of the first adjusting bolt 41. The third screw hole is a through hole, and the first adjusting bolt 41 is threadedly connected to the third screw hole. The first adjusting bolt 41 is vertically downward, and its lower end passes through the gap to abut against the top surface of the cutter head 3. The clamping force on the cutter head 3 is adjusted by rotating the first adjusting bolt 41. Several third adjusting bolts 42 are evenly distributed circumferentially between the cutter head 3 and the mounting plate 2. A through hole is provided on the cutter head 3 corresponding to the position of the third adjusting bolt 42, and a second screw hole is provided on the mounting plate 2 corresponding to the position of the third adjusting bolt 42. The third adjusting bolt 42 passes through the through hole and gap of the cutter head 3 from below and connects to the second screw hole of the mounting plate 2. When the cutter head 3 is unbalanced, the cutter head 3 can be leveled by adjusting the tightness of the third adjusting bolt 42. Small-sized cutter heads may not require the third adjusting bolt 42. The distance L1 between the first fixing bolt 5 and the main shaft, the distance L2 between the third adjusting bolt 42 and the main shaft, and the distance L3 between the first adjusting bolt 41 and the main shaft, where L1 < L2 < L3. A second adjusting bolt 43 is provided on one side of the first adjusting bolt 41 on the mounting plate 2. The second adjusting bolt 43 can be located on one or both sides of the first adjusting bolt 41, in front of, behind, to the left of, or to the right of the first adjusting bolt 41. In this embodiment, the second adjusting bolt 43 is located on the left and right sides of the first adjusting bolt 41. The first adjusting bolt 41 and the second adjusting bolt 43 are on the same arc. The second adjusting bolt 43 passes through the mounting plate 2 and is threadedly connected to the cutter head 3. The second adjusting bolt 43 exerts a tension force on the cutter head 3, and this tension force can be adjusted by rotating the second adjusting bolt 43.

[0034] When it is necessary to adjust the blade level by adjusting the tilt of the cutter head 3, there are three or four first adjusting bolts 41, which are suitable for cutter heads 3 with smaller diameters. By pressing the cutter head 3 with the first adjusting bolts 41, the first fixing bolt 5 used to lock the cutter head 3 is stretched to a limited extent, thereby causing the side of the cutter head 3 with greater force to tilt, so as to achieve the purpose of adjusting each blade.

[0035] When leveling is required by adjusting the height of each blade, the number of the first adjusting bolts 41 is the same as the number of blades and corresponds one-to-one. This is suitable for a larger diameter cutter head 3. The first adjusting bolts 41 are located above the blades. The pressure of the first adjusting bolts 41 causes local deformation of the cutter head 3. While adjusting the clamping force, the second adjusting bolts 43 can be used to adjust the tension force, allowing for fine-tuning of the blade height in the corresponding area. The cutter head 3 has cutting grooves between adjacent blades. The cutting grooves divide the blades on the cutter head 3. After the cutter head 3 is deformed by the pressure of the first adjusting bolts 41, it will not affect the nearby blades, and it also makes it easier to deform the cutter head 3 locally. Example

[0036] like Figure 5 As shown, an adjustable milling cutter head includes a cutter head 3, a cutter shank 6 mounted on the cutter head 3, and a cutting insert 7 mounted at the lower end of the cutter shank 6. The top of the cutter head 3 is provided with a mounting plate 2 for mounting an adjustment mechanism for adjusting the height of the cutter shank 6. A gap exists between the mounting plate and the cutter head 3. The mounting plate 2 is a disc, and its diameter is the same as that of the cutter head 3. The cutter shank 6 has an elongated hole, the length of which can be set according to the height adjustment range. A locking bolt passes through the elongated hole to lock the cutter shank 6 onto the cutter head 2. After loosening the locking bolt, the cutter shank 6 can move up and down, but cannot rotate.

[0037] like Figure 5 , 6As shown, the adjusting mechanism 4 includes a first threaded rod 41 threadedly connected to a cutter bar 6 mounted on the cutter head 2, a first nut 47 fitted on the first threaded rod 41 and capable of pressing the cutter bar 6, a first threaded sleeve 46 disposed in the mounting hole 31 of the mounting plate 3, a second threaded sleeve 43 passing through and threadedly engaged with the first threaded sleeve 46, a pressure plate 45 for pressing the first threaded sleeve 46, and a second nut 42 fitted on the first threaded rod 41 and capable of pressing the second threaded sleeve 43. The mounting plate 3 is integrally formed with the cutter head 2, or the inner side of the mounting plate 3 is connected and fixed to the cutter head 2 by bolts; a gap is provided between the outer side of the mounting plate 3 and the top surface of the cutter head 2, which is used to accommodate the first nut 47, so that the first nut 47 has space for vertical adjustment. The mounting holes 31 correspond one-to-one with the tool holders 6. The mounting holes 31 are located above the tool holders 6, and the adjustment mechanism adjusts each tool holder 6 individually. The mounting holes 31 are stepped holes. The shape of the first threaded sleeve 46 is similar to that of the mounting holes 31. The first threaded sleeve 46 will not fall off after being installed in the mounting holes 31. When the pressure plate 45 presses down on the first threaded sleeve 46, the first threaded sleeve 46 exerts pressure on the stepped hole, increasing the friction between the two and thus restricting the rotation of the first threaded sleeve 46 in the stepped hole. After the pressure plate 45 is released, the first threaded sleeve 46 can rotate in the stepped hole due to the reduced pressure. The two states are adjusted by the pressure of the pressure plate 45. The second threaded sleeve 43 has a central through hole. The first threaded rod 41 passes through the central through hole of the second threaded sleeve 43 and is threadedly connected to the upper end of the tool holder 6. The second threaded sleeve 43 includes a rotating head 431 and a threaded portion 432. The threaded portion 432 has external threads and passes through the internal threaded hole of the first threaded sleeve 46. The internal threaded hole is threadedly engaged with the threaded portion 432 of the second threaded sleeve 43. The rotating head 431 is located above the first threaded sleeve 46. A wrench can be used to rotate the threaded portion 432 by applying force to the rotating head 431. The rotation of the threaded portion 432 can cause the entire second threaded sleeve 43 to move up and down relative to the first threaded sleeve 46. The pressure plate 45 is annular and covers the first threaded sleeve 46. The pressure plate 45 has a through hole for the threaded portion 432 to pass through. The pressure plate 45 presses the first threaded sleeve 46 with bolts 68. The pressure of the pressure plate 45 on the first threaded sleeve 46 can be changed by changing the tightness of the bolts 68.The first nut 47 is threadedly connected to the first threaded rod 41. The first nut 47 is located between the tool holder 6 and the second threaded sleeve 43. When the first nut 47 is locked and presses the upper end of the tool holder 6, the first threaded rod 41 and the tool holder 6 cannot rotate relative to each other. When the first nut 47 is loosened and moves away from the tool holder 6, the first threaded rod 41 can rotate relative to the tool holder 6. The second nut 42 is threadedly connected to the first threaded rod 41. The second nut 42 is located above the second threaded sleeve 43. When the second nut 42 is locked and presses the rotating head 431, the first threaded rod 41 and the second threaded sleeve 43 cannot rotate relative to each other. The first threaded rod 41 and the second threaded sleeve 43 form a whole and rotate together. When the second nut 42 is loosened and moves away from the rotating head 431, the first threaded rod 41 can be rotated independently without affecting the second threaded sleeve 43. A pressure pad 44 is provided between the rotating head 431 and the pressure plate 45. The pressure pad 44 is used to leave a gap between the rotating head 431 and the pressure plate 45. After the pressure pad 44 is removed, the second threaded sleeve 43 has enough space to rotate in both directions, ultimately realizing the up and down movement of the tool holder 6. The upper end of the first threaded rod 41 is provided with an internal hexagonal hole 411. When it is necessary to rotate the first threaded rod 41 alone, the first threaded rod 41 is rotated through the internal hexagonal hole 411. The thread pitch of the first threaded rod 41 is different from the thread pitch of the second threaded sleeve 43. In this embodiment, the thread pitch of the second threaded sleeve 43 is greater than the thread pitch of the first threaded rod 41, that is, the height of the second threaded sleeve 43 moving up and down per revolution is greater than the height of the tool holder 6 moving up and down per revolution of the first threaded rod 41.

[0038] The blade height adjustment method of the present invention includes the following steps:

[0039] (1) Loosen the first nut 47 so that the first threaded rod 41 can rotate relative to the tool bar 6, and loosen the pressure plate 45 so that the second threaded sleeve 43 can rotate relative to the mounting plate 3;

[0040] (2) Rotate the first threaded rod 41. The first threaded rod 41 drives the second threaded sleeve 43 and the first threaded sleeve 46 to rotate together. The first threaded rod 41 selects the tool bar 6 to rotate, causing the tool bar 6 to move up and down, thereby achieving the coarse adjustment of the height of the tool bar 6.

[0041] (3) Press the first threaded sleeve 46 with the pressure plate 45 to restrict its rotation, remove the pressure pad to leave an adjustment gap between the rotating head 431 and the pressure plate 45, and lock the second nut 42 to connect the second threaded sleeve 43 and the first threaded rod 41 into one piece.

[0042] (4) Rotate the second threaded sleeve 43. The second threaded sleeve 43 drives the first threaded rod 41 to rotate. The tool bar 6 moves up and down relative to the first threaded rod 41. The second threaded sleeve 43 drives the first threaded rod 41 to move up and down relative to the first threaded sleeve 46. The direction of movement of the tool bar 6 is opposite to the direction of movement of the first threaded rod 41. The height of the tool bar 6 is finely adjusted by the height difference between the tool bar 6 and the first threaded rod 41. When the tool bar 6 is finely adjusted downward, rotate the second threaded sleeve 43 so that it drives the first threaded rod 41 to move down a distance L1 relative to the first threaded sleeve 46. The distance of upward movement of the tool bar 6 relative to the first threaded rod 41 is L2. L1-L2 is the distance of downward movement of the tool bar 6.

[0043] (5) After the height of the tool holder 6 is adjusted, tighten the first nut 47 and the second nut 42. Example

[0044] like Figure 7 As shown, an adjustable milling cutter head includes a cutter head 3, a cutter shank 6 mounted on the cutter head 3, and a cutting insert 7 mounted at the lower end of the cutter shank 6. The top of the cutter head 3 is provided with a mounting plate 2 for mounting an adjustment mechanism for adjusting the height of the cutter shank 6. A gap exists between the mounting plate and the cutter head 3. The mounting plate 2 is a disc, and its diameter is the same as that of the cutter head 3. The cutter shank 6 has an elongated hole, the length of which can be set according to the height adjustment range. A locking bolt passes through the elongated hole to lock the cutter shank 6 onto the cutter head 2. After loosening the locking bolt, the cutter shank 6 can move up and down, but cannot rotate.

[0045] like Figure 7 , 8As shown, the adjusting mechanism 4 includes a second threaded rod 41 threadedly connected to a cutter bar 6 mounted on the cutter head 2, a third nut 45 fitted on the second threaded rod 41 and capable of pressing the cutter bar 6, a third threaded sleeve 43 disposed in the mounting hole 31 of the mounting plate 3, a second pressure plate 44 for pressing the third threaded sleeve 43, and a fourth nut 42 fitted on the second threaded rod 41 and capable of pressing the third threaded sleeve 43. The mounting plate 3 is integrally formed with the cutter head 2, or the inner side of the mounting plate 3 is connected and fixed to the cutter head 2 by bolts; a gap is provided between the outer side of the mounting plate 3 and the top surface of the cutter head 2, which is used to accommodate the third nut 45, so that the third nut 45 has space for vertical adjustment. The mounting hole 31 corresponds one-to-one with the cutter bar 6, and the mounting hole 31 is located above the cutter bar 6. The adjusting mechanism 4 adjusts each cutter bar 6 individually; the mounting hole 31 is a stepped hole, and the mounting hole 31 is a through hole. The third threaded sleeve 43 includes a rotating part 432 similar in shape to the stepped hole and a protrusion 431 on the top of the rotating part 432. The second pressure plate 44 is used to press the rotating part 432. When the second pressure plate 44 presses the third threaded sleeve 43 downward, the third threaded sleeve 43 generates pressure on the stepped hole, increasing the friction between the two and thus restricting the rotation of the third threaded sleeve 43 in the stepped hole. After the second pressure plate 44 is released, the third threaded sleeve 43 can rotate in the stepped hole due to the reduced pressure. The two states are adjusted by the pressure of the second pressure plate 44. The fourth nut 42 is used to press the protrusion 431. When the fourth nut 42 is locked and presses the protrusion 431, the second threaded rod 41 and the third threaded sleeve 43 are connected as one unit and can rotate together. The third threaded sleeve 43 is provided with an internal threaded hole that is threadedly engaged with the second threaded rod 41. The third nut 45 is threadedly connected to the second threaded rod 41. The third nut 45 is located between the tool bar 6 and the third threaded sleeve 43. When the third nut 45 is locked and presses the upper end of the tool bar 6, the second threaded rod 41 and the tool bar 6 cannot rotate relative to each other. When the third nut 45 is loosened and moves away from the tool bar 6, the second threaded rod 41 can rotate relative to the tool bar 6. The second threaded rod 41 includes an upper threaded section 412 and a lower threaded section 413. The threads of the upper threaded section 412 and the lower threaded section 413 are in the same direction. The tool holder 6 and the third nut 45 are threadedly connected to the lower threaded section 413, and the third threaded sleeve 43 and the fourth nut 42 are threadedly connected to the upper threaded section 412. The upper end of the second threaded rod 41 is provided with an internal hexagonal hole 411 to facilitate the rotation of the second threaded rod 41 by the tool. The pitches of the upper threaded section 412 and the lower threaded section 413 are different. In this embodiment, the pitch of the upper threaded section 412 is greater than the pitch of the lower threaded section 413, that is, the height that the second threaded rod 41 moves up and down relative to the third threaded sleeve 43 for each rotation is greater than the height that the tool holder 6 moves up and down relative to the threaded section.The second pressure plate 44 is provided with a through hole for the protrusion 431 to extend out. The second pressure plate 44 is locked to the mounting plate 3 by bolts. The pressure of the second pressure plate 44 on the third threaded sleeve 43 is adjusted by the tightness of the bolts.

[0046] The blade height adjustment method of the present invention includes the following steps:

[0047] (1) Loosen the third nut 45 so that the second threaded rod 41 can rotate relative to the tool bar 6, and loosen the second pressure plate 44 so that the third threaded sleeve 43 can rotate relative to the mounting plate 3;

[0048] (2) Rotate the second threaded rod 41 to move the tool holder 6 up and down relative to the second threaded rod 41, thereby achieving coarse adjustment of the height of the tool holder 6;

[0049] (3) The second pressure plate 44 presses the third threaded sleeve 43 to restrict its rotation, and the fourth nut 42 is loosened so that the second threaded rod 41 can rotate relative to the third threaded sleeve 43;

[0050] (4) Rotate the second threaded rod 41, and the tool bar 6 moves up and down relative to the lower threaded section 413, and the upper threaded section 412 moves up and down relative to the third threaded sleeve 43. The direction of movement of the tool bar 6 is opposite to the direction of movement of the second threaded rod 41. The height of the tool bar 6 is finely adjusted by the difference in the height of the two. When the tool bar 6 is finely adjusted downward, rotate the second threaded rod 41 so that the second threaded rod 41 moves downward relative to the third threaded sleeve 43 by a distance L1, and the tool bar 6 moves upward relative to the second threaded rod 41 by a distance L2. L1-L2 is the distance that the tool bar 6 moves downward.

[0051] (5) After the height of the tool bar 6 is adjusted, tighten the third nut 45 and press the tool bar 6, tighten the fourth nut 42 and press the third threaded sleeve 43. Example

[0052] like Figures 9 to 11 As shown, an adjustable milling cutter head includes a cutter head 2 and inserts 7 mounted on the cutter head 2. The top of the cutter head 2 is provided with a mounting plate 3 for mounting an adjusting mechanism 4 for adjusting the height of the cutter shank. A gap exists between the mounting plate and the cutter head 2. The mounting plate 3 is a disc, and its diameter is the same as that of the cutter head 2. The cutter head 2 and the mounting plate 3 are independent components, and are locked to the spindle by a first fixing bolt 5. A boss is provided in the center of the top surface of the cutter head 2, and a groove is provided on the bottom surface of the mounting plate 3 corresponding to the boss. The boss abuts against the bottom surface of the mounting plate 3, and the first fixing bolt 5 passes through the boss. The cutter head has several axially circumferentially distributed cutting grooves, and the adjusting mechanism and inserts are arranged in the area between adjacent cutting grooves. Figure 12 As shown, if the cutter head 2 is of a large disc size, a second fixing bolt 8 can be added between the third threaded rod 41 and the first fixing bolt.

[0053] like Figure 10 As shown, the adjusting mechanism 4 includes a third threaded rod 41, a fourth threaded sleeve 43 screwed onto the third threaded rod 41, a fifth nut 42 screwed onto the third threaded rod 41 and located above the fourth threaded sleeve 43, a sixth nut 44 screwed onto the fourth threaded sleeve 43 and located above the mounting plate 3, and a seventh nut 45 screwed onto the third threaded rod 41 and located between the mounting plate 3 and the cutter head 2. The fourth threaded sleeve 43 is threadedly connected to both the mounting plate 3 and the cutter head 2. The external thread of the fourth threaded sleeve 43 is threadedly connected to the mounting plate 3, and the internal thread of the fourth threaded sleeve 43 is threadedly connected to the third threaded rod 41. The pitches of the internal and external threads of the fourth threaded sleeve 43 are different, and different pitches can be set according to the adjustment accuracy. Generally speaking, the pitch of the external thread is greater than the pitch of the internal thread.

[0054] The blade height adjustment method of the present invention includes the following steps:

[0055] (1) Tighten the seventh nut 45 so that the third threaded rod 41 cannot rotate, and loosen the fifth nut 42 and the sixth nut 44 so that the fourth threaded sleeve 43 can rotate freely;

[0056] (2) Rotate the fourth threaded sleeve 43. Since the external thread of the fourth threaded sleeve 43 is threadedly connected to the mounting plate and the internal thread is threadedly connected to the third threaded rod 41, the direction of movement of the fourth threaded sleeve 43 relative to the mounting plate is opposite to the direction of movement of the fourth threaded sleeve 43 relative to the third threaded rod 41. That is, when the fourth threaded sleeve 43 rotates one revolution and moves downward a distance L1 relative to the mounting plate, the distance that the third threaded rod 41 moves upward relative to the fourth threaded sleeve 43 is L2. The total downward movement distance of the third threaded rod 41 is L1-L2. The downward movement of the third threaded sleeve can force the cutter head to deform, thereby causing the blade to move and realizing the fine adjustment of the blade position.

[0057] (3) After adjustment, tighten the fifth nut 42 and the sixth nut 44.

Claims

1. An adjustable milling cutter head, comprising a cutter head and inserts disposed on the cutter head, characterized in that: The top of the cutter head is provided with a mounting plate for installing an adjustment mechanism for adjusting the blade height, and there is a gap between the mounting plate and the cutter head; the adjustment mechanism includes a plurality of first adjustment bolts evenly distributed on the mounting plate around its circumference, the first adjustment bolts passing through threaded holes in the mounting plate and abutting against the top surface of the cutter head; a second adjustment bolt is provided on one side of the first adjustment bolts on the mounting plate, the second adjustment bolt passing through the mounting plate and threadedly connected to the cutter head; a third adjustment bolt is provided between the cutter head and the mounting plate, the third adjustment bolt passing through the cutter head and threadedly connected to the mounting plate.

2. The adjustable milling cutter head according to claim 1, characterized in that: The cutter head and mounting plate are locked onto the spindle by the first fixing bolt.

3. An adjustable milling cutter head according to claim 2, characterized in that: A boss is provided in the middle of the top surface of the cutter head, and the boss abuts against the bottom surface of the mounting plate. The first fixing bolt passes through the boss.

4. An adjustable milling cutter head according to claim 3, characterized in that: The bottom surface of the mounting plate has a groove corresponding to the protrusion.

5. An adjustable milling cutter head according to claim 1, characterized in that: The mounting plate and the cutter head are an integral structure. The cutter head is locked to the spindle by the first fixing bolt, and the gap is formed by cutting.

6. An adjustable milling cutter head according to claim 1, characterized in that: The mounting plate is a disc, and the diameter of the mounting plate is the same as the diameter of the cutter head.

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