Large back milling cutter with adjustable milling radius

Abstract

The utility model relates to the technical field of back milling cutters, and particularly discloses a large back milling cutter with adjustable milling radius, which comprises a cutter main body, a cutter handle and a cutting edge, two ends of the cutter main body are respectively provided with a mounting groove arranged along the length direction of the cutter main body, one end of the cutter handle is movably arranged in the mounting groove, and the other end of the cutter handle is movably arranged in the cutting edge. One end of the cutter handle can move along the arrangement direction of the mounting groove and can be fixed at any position in the mounting groove, the other end of the cutter handle extends out of the mounting groove, the cutting edge is fixed at one end, extending out of the mounting groove, of the cutter handle, and the cutting edge can be driven to synchronously move in the displacement process of the cutter handle; due to the fact that the installation groove is formed in the length direction of the cutter body, the cutter handle can move to drive the cutting edges to move towards the position close to or away from the middle of the cutter body, then the milling radius is adjusted, and due to the fact that the positions of the cutting edges at the two ends can be adjusted, the adjustable range is large, and the cutter can be suitable for machining of large workpieces.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of back milling cutters, in particular to a large back milling cutter with adjustable milling radius. BACKGROUND

[0002] Back milling is a key process for back surface cutting, grooving or forming of large workpieces in the field of mechanical manufacturing, and is widely used in the machining of super-large size structural parts in the aerospace, shipbuilding, heavy machinery and other industries. Traditional large back milling cutters usually adopt fixed structure design, and the milling radius is determined by the geometric size of the cutter in advance, which cannot be flexibly adjusted according to the processing requirements. However, in actual production, if different radius back milling features need to be processed, the operator must replace cutters of different specifications, which not only reduces the processing efficiency, but also increases the cost of cutter procurement and maintenance.

[0003] In the prior art, some adjustable back milling cutters try to adjust the radius by modular inserts or additional shims, but such solutions have the following defects: first, the adjustment process requires disassembly of the cutter assembly, which is tedious and difficult to ensure the repeatability of the positioning accuracy; second, the additional structure may weaken the overall rigidity of the cutter, especially under heavy load cutting conditions, which may cause deformation or even failure of the cutter; third, the adjustment range is limited, which is difficult to meet the demand for super large cutting radius of large workpieces. In addition, the locking mechanism of the existing cutter relies on single direction bolt fixing, which may cause displacement of the cutter shank under the action of centrifugal force or cutting force during high speed milling, affecting the processing stability. SUMMARY

[0004] The utility model considers the foregoing problem and is made, the utility model discloses a kind of large back milling cutters with adjustable milling radius, milling radius can be adjusted, save cost, improve processing efficiency.

[0005] To achieve the above object, the utility model provides a kind of large back milling cutters with adjustable milling radius, comprising:

[0006] The cutter body is provided with a mounting groove arranged along its length direction at both ends;

[0007] The cutter shank is movably arranged in the mounting groove at one end, and can be fixed at any position in the mounting groove, and the other end of the cutter shank protrudes out of the mounting groove;

[0008] The cutting edge is fixed on the end of the cutter shank protruding out of the mounting groove.

[0009] The large back milling cutter with adjustable milling radius also comprises an adjusting bolt, the cutter body is further provided with an accommodating groove, the accommodating groove is located on one side of the mounting groove, one end of the adjusting bolt is movably arranged in the accommodating groove, the other end of the adjusting bolt is located in the mounting groove and is in threaded connection with the end of the tool shank and can drive the tool shank to displace.

[0010] The large back milling cutter with adjustable milling radius also comprises a limiting nut, the limiting nut is fixed on the inner wall of the accommodating groove, and one end of the adjusting bolt located in the accommodating groove is arranged through the limiting nut and is in threaded engagement with the limiting nut.

[0011] The large back milling cutter with adjustable milling radius, the limiting nut is fixed on the side of the accommodating groove close to the mounting groove, and the end of the adjusting bolt away from the mounting groove is provided with a nut, the diameter of the nut is greater than the inner diameter of the limiting nut.

[0012] The large back milling cutter with adjustable milling radius also comprises an upper cover, the upper cover is detachably fixed above the mounting groove by screws, and the bottom of the upper cover can be attached to the top of the tool shank.

[0013] The large back milling cutter with adjustable milling radius also comprises a first locking bolt, a plurality of first positioning holes are formed on one side of the cutter body, the plurality of first positioning holes are in communication with the mounting groove, the plurality of first locking bolts correspond to the plurality of first positioning holes one by one, and the plurality of first locking bolts can abut against one side of the tool shank through the first positioning holes.

[0014] The large back milling cutter with adjustable milling radius also comprises a second locking bolt, a plurality of second positioning holes are formed on the bottom of the cutter body, the plurality of second positioning holes are in communication with the mounting groove, the plurality of second locking bolts correspond to the plurality of second positioning holes one by one, and the plurality of second locking bolts can abut against the bottom of the tool shank through the first positioning holes.

[0015] The large back milling cutter with adjustable milling radius, the middle part of the cutter body is provided with a connecting part, and the connecting part is used for fixing the back milling cutter to the main shaft of the machine tool.

[0016] The large back milling cutter with adjustable milling radius, the connecting part comprises a plurality of first interfaces and a plurality of second interfaces, the plurality of first interfaces form a first interface ring with a first diameter, the plurality of second interfaces form a second interface ring with a second diameter, the second diameter is greater than the first diameter, and the main shaft of the machine tool is adapted to the first interface ring or the second interface ring.

[0017] According to the large back milling cutter with adjustable milling radius, the connecting part further comprises a plug-in part and two cross-arranged clamping grooves, the plug-in part is located at the intersection of the two clamping grooves and is used for being inserted into the main shaft of the machine tool, and the two clamping grooves are matched with the protrusions on the main shaft of the machine tool.

[0018] The utility model has the advantages of the following:

[0019] 1、The position of the shank in the mounting groove is adjustable, so that the distance between the cutting edge and the middle part of the cutter body can be adjusted, the milling radius is adjusted, the demand for different milling radii is met, the cutter does not need to be replaced, cost is saved, and the processing efficiency can be improved.

[0020] 2、The shank can be clamped and positioned in multiple directions by the upper cover, the first locking bolt and the second locking bolt, the clamping is more stable, the situation that the cutting edge shakes during processing can be avoided, and the processing effect is improved.

[0021] 3、The connecting part is provided with at least two interface rings, and can be suitable for at least two machine tool main shafts with different diameters, and has good applicability. BRIEF DESCRIPTION OF DRAWINGS

[0022] Fig. 1 It is a schematic diagram of the overall structure of the embodiment.

[0023] Fig. 2 It is a schematic diagram of the bottom structure of the embodiment.

[0024] Fig. 3 It is a schematic diagram of the shank assembly of the embodiment.

[0025] In the drawings:

[0026] 1, cutter body; 11, mounting groove; 12, containing groove; 2, shank; 3, cutting edge; 4, adjusting bolt; 5, limiting nut; 6, upper cover; 7, first locking bolt; 8, second locking bolt; 9, connecting part; 91, first interface; 92, second interface; 93, plug-in part; 94, clamping groove. DETAILED DESCRIPTION

[0027] The following is a specific embodiment of the utility model and is further described in combination with the drawings, but the utility model is not limited to these embodiments.

[0028] As Figs. 1-3 shown, a large back milling cutter with adjustable milling radius comprises a cutter body 1, a shank 2 and a cutting edge 3.

[0029] In the embodiment, the cutter body 1 is provided with a mounting groove 11 arranged along the length direction of the cutter body 1 at both ends thereof, and one end of the shank 2 is movably arranged in the mounting groove 11 and can be displaced along the arrangement direction of the mounting groove 11 and fixed at any position in the mounting groove 11, and the other end of the shank 2 extends out of the mounting groove 11, and the blade 3 is fixed on the end of the shank 2 extending out of the mounting groove 11, and the shank 2 can drive the blade 3 to synchronously displace during the displacement of the shank 2, since the mounting groove 11 is arranged along the length direction of the cutter body 1, the displacement of the shank 2 can drive the blade 3 to move towards or away from the middle part of the cutter body 1, thereby realizing the adjustment of the milling radius, and since the blades 3 at both ends can be adjusted in position, the adjustable range is large, and the machining of large workpieces can be realized.

[0030] In order to realize the adjustment of the shank 2, an adjusting bolt 4 is further arranged, and a containing groove 12 is further arranged on the cutter body 1, the containing groove 12 is arranged on one side of the mounting groove 11 and along the length direction of the cutter body 1, so as to arrange the adjusting bolt 4 along the length direction of the cutter body 1, one end of the adjusting bolt 4 is movably arranged in the containing groove 12, and the other end of the adjusting bolt 4 is arranged in the mounting groove 11, and the end thereof arranged in the mounting groove 11 is threadedly connected with the end of the shank 2 and can drive the shank 2 to displace, that is, when the adjusting bolt 4 is rotated, since the adjusting bolt 4 is threadedly connected with the end of the shank 2, the adjusting bolt 4 can drive the shank 2 to displace along the direction of the mounting groove 11, thereby realizing the adjustment of the position of the shank 2.

[0031] In order to improve the adjustment efficiency of the shank 2, a limiting nut 5 is further arranged, the limiting nut 5 is fixed on the inner wall of the containing groove 12, the end of the adjusting bolt 4 arranged in the containing groove 12 is arranged on the limiting nut 5 and threadedly engaged with the limiting nut 5, and the other end of the adjusting bolt 4 is threadedly connected with the shank 2, as long as the rotation direction of the inner thread of the end of the shank 2 and the limiting nut 5 is set to be the same, when the adjusting bolt 4 is rotated, since the position of the limiting nut 5 does not change, the position of the adjusting bolt 4 changes, and since the adjusting bolt 4 is threadedly connected with the shank 2, the rotation of the adjusting bolt 4 can drive the shank 2 to move in position on the adjusting bolt 4, thereby realizing the synchronous displacement of the shank 2 and the adjusting bolt 4, the displacement of the shank 2 and the adjusting bolt 4 can be superimposed, thereby improving the adjustment efficiency of the shank 2 and reducing the operation difficulty.

[0032] The limiting nut 5 is fixed on the side of the containing groove 12 close to the mounting groove 11, the end of the adjusting bolt 4 away from the mounting groove 11 is provided with a nut, the diameter of the nut is larger than the inner diameter of the limiting nut 5, and the limiting nut 5 can improve the adjustment efficiency of the shank 2 and also has a limiting effect, which can prevent the end of the adjusting bolt 4 provided with the nut from being separated from the containing groove 12, thereby avoiding the problem of poor installation stability of the shank 2 caused by excessive adjustment.

[0033] In order to realize the stability of the shank 2, prevent the blade 3 from shaking in the machining process, also includes the upper cover 6, the upper cover 6 is detachably fixed above the installation groove 11 by the screw, and the bottom of the upper cover 6 can be combined with the top of the shank 2, then the upward freedom of the shank 2 can be limited by the upper cover 6, prevent it from acting upward, and can play a shielding shank 2, improve the appearance effect, because the upper cover 6 can be disassembled, it is also convenient for the installation and disassembly of the shank 2, that is, the upper cover 6 can be installed after the shank 2 is installed, when the shank 2 needs to be disassembled, the upper cover 6 can be disassembled first.

[0034] In order to realize the positioning and locking of the shank 2 in other directions, also includes the first locking bolt 7 and the second locking bolt 8, wherein the cutter body 1 is provided with a plurality of first positioning holes on one side, the plurality of first positioning holes are communicated with the installation groove 11, the plurality of first locking bolts 7 are corresponding to the plurality of first positioning holes, and can abut with one side of the shank 2 through the first positioning hole, that is, one end of the first locking bolt 7 can abut with one side of the shank 2 through the first positioning hole, which can drive the shank 2 to move to the other side until the shank 2 abuts with the other side of the installation groove 11, complete the lateral positioning, prevent the shank 2 from moving laterally.

[0035] Among them, the bottom of the cutter body 1 is provided with a plurality of second positioning holes, the plurality of second positioning holes are communicated with the installation groove 11, the plurality of second locking bolts 8 are corresponding to the plurality of second positioning holes, and can abut with the bottom of the shank 2 through the first positioning hole, which can drive the shank 2 to abut with the bottom of the upper cover 6, and cooperate with the upper cover 6 to realize the clamping of the shank 2 in the upward and downward directions, and then the freedom of the shank 2 in four directions can be limited, so as to achieve the effect of complete positioning, which can ensure the stability of the shank 2, and can avoid the deviation of the blade 3 in the machining process, improve the machining precision.

[0036] In order to install the back milling cutter to the spindle of the machine tool, the middle part of the cutter body 1 is provided with a connecting part 9, which is used for fixing the back milling cutter to the spindle of the machine tool, after fixing, the spindle of the machine tool can drive the back milling cutter to move, so as to realize the milling action of the back milling cutter.

[0037] In order to be suitable for machine tool spindles of different diameters and improve the applicability of the back milling cutter, the connecting part 9 comprises a plurality of first interfaces 91 and a plurality of second interfaces 92, the plurality of first interfaces 91 enclose a first diameter interface ring, and the plurality of second interfaces 92 enclose a second diameter second interface 92 ring, wherein the second diameter is greater than the first diameter, and in this embodiment, the assembly of the machine tool spindle and the back milling cutter is realized through the interface ring, that is, the spindle of the machine tool is matched with the first interface 91 ring or the second interface 92 ring. Because there are at least two groups of interface rings with inconsistent diameters, at least two different models of machine tool spindles can be applied, thereby improving the applicability.

[0038] Of course, in addition to the first interface 91 ring and the second interface 92 ring mentioned in this embodiment, a plurality of third interfaces and a plurality of fourth interfaces can also be provided, which respectively combine to form interface rings of different diameters and can be suitable for machine tool spindles of various models.

[0039] In order to ensure the stability of the connection, the connecting part 9 further comprises a plug-in part 93 and two cross-arranged clamping grooves 94, the plug-in part 93 is located at the intersection of the two clamping grooves 94, which is used to be inserted into the spindle of the machine tool to assist in positioning, and the two clamping grooves 94 are matched with the protrusions on the spindle of the machine tool, that is, the clamping grooves 94 and the protrusions are used for clamping positioning, which ensures that the connecting part 9 can rotate with the spindle of the machine tool, and ensures the stability of the spindle drive of the machine tool.

[0040] Taking the back milling machining of an aero-engine casing as an example:

[0041] In the machining of a titanium alloy casing of an aero-engine, a sealing groove with a depth of 15 mm and a radius tolerance of ±0.05 mm needs to be machined on a ring structure with a diameter of 2.8 meters. The traditional process needs to replace three kinds of cutter, and the operation of this embodiment is as follows:

[0042] Cutter pre-adjustment:

[0043] Loosen the inner hexagonal screws of the upper cover 6 on both sides;

[0044] Rotate the nut of the adjusting bolt 4 counterclockwise, and every turn of the adjusting bolt 4 will cause a 2.5 mm displacement of the cutter handle 2;

[0045] Monitor the distance between the cutting edges 3 by a laser range finder, and adjust the radius from the default 800 mm to 1260 mm;

[0046] Multi-directional locking:

[0047] Lock the upper cover 6, and then lock the first locking bolt 7 and the second locking bolt 8 in turn, so that the cutter handle 2 is completely positioned;

[0048] Machining verification:

[0049] First, other materials are used for processing verification, such as determining that the requirements are met, and processing the materials that need to be processed.

[0050] Of course, in addition to the aviation field, the large back milling cutter is also suitable for shipbuilding and ocean engineering, energy equipment manufacturing, rail transportation field, and general precision manufacturing, such as shell, bearing seat, sealing groove, and hub machining, etc.

[0051] The technical solutions of the utility model are described in detail above with reference to the drawings, and the described embodiments are used to help understand the idea of the utility model. The specific embodiments described in this paper are only illustrative of the spirit of the utility model. Those skilled in the art to which the utility model belongs can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but without deviating from the spirit of the utility model or exceeding the scope defined by the appended claims.

[0052] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0053] In addition, the descriptions such as "first", "second", "one" and the like in the utility model are only for description purposes and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0054] In the utility model, unless otherwise specifically defined and limited, the terms "connection", "fixation" and the like should be understood broadly, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0055] In addition, the technical solutions of each embodiment of the utility model can be combined with each other, but it must be based on the realization of ordinary technical personnel in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the protection scope required by the utility model.

Claims

1. A large diameter back-cutter with adjustable milling radius, characterized in that, The utility model relates to a cutter tool, comprising: a cutter body having a mounting slot arranged along a length direction of the cutter body at each end of the cutter body; a shank movably arranged in the mounting slot and fixable at any position in the mounting slot, the shank having an end extending out of the mounting slot; a cutting edge fixed to the end of the shank extending out of the mounting slot.

2. A large diameter back-cutter with adjustable milling radius according to claim 1, characterized in that, The utility model further comprises an adjusting bolt, a receiving slot arranged on a side of the mounting slot, one end of the adjusting bolt movably arranged in the receiving slot, and the other end of the adjusting bolt arranged in the mounting slot and threadedly engaged with an end of the shank to drive the shank to move.

3. A large diameter back-cutter with adjustable milling radius according to claim 2, characterized in that, The utility model further comprises a limiting nut fixed to an inner wall of the receiving slot, the end of the adjusting bolt arranged in the receiving slot passing through the limiting nut and threadedly engaged with the limiting nut.

4. A large diameter back-cutter with adjustable milling radius according to claim 3, characterized in that, The limiting nut is fixed to a side of the receiving slot close to the mounting slot, an end of the adjusting bolt away from the mounting slot is provided with a nut, and a diameter of the nut is greater than an inner diameter of the limiting nut.

5. A large diameter back-cutter with adjustable milling radius according to claim 1, characterized in that, The utility model further comprises an upper cover detachably fixed to a top of the mounting slot by screws, and a bottom of the upper cover is attachable to a top of the shank.

6. A large diameter back-cutter with adjustable milling radius according to claim 1 or 5, characterized in that, The utility model further comprises a first locking bolt, a plurality of first positioning holes arranged on a side of the cutter body, the first positioning holes being in communication with the mounting slot, the first locking bolt corresponding to the first positioning hole, and the first locking bolt abutting against a side of the shank through the first positioning hole.

7. A large diameter back-cutter with adjustable milling radius according to claim 6, characterized in that, The utility model further comprises a second locking bolt, a plurality of second positioning holes arranged on a bottom of the cutter body, the second positioning holes being in communication with the mounting slot, the second locking bolt corresponding to the second positioning hole, and the second locking bolt abutting against the bottom of the shank through the first positioning hole.

8. A large diameter back-cutter with adjustable milling radius according to claim 1, characterized in that, A connecting portion is arranged in a middle portion of the cutter body, and the connecting portion is used for fixing the back milling cutter to a main shaft of a machine tool.

9. A large diameter back-cutter with adjustable milling radius according to claim 8, characterized in that, The connecting portion comprises a plurality of first interfaces and a plurality of second interfaces, the first interfaces are combined to form a first interface ring having a first diameter, the second interfaces are combined to form a second interface ring having a second diameter, the second diameter is greater than the first diameter, and the main shaft of the machine tool is adapted to the first interface ring or the second interface ring.

10. A large diameter back-cutter with adjustable milling radius according to claim 9, characterized in that, The connecting portion further comprises a plug-in piece and two cross-arranged clamping grooves, the plug-in piece is arranged at a cross of the clamping grooves and is used for being inserted into the main shaft of the machine tool, and the clamping grooves are adapted to protrusions on the main shaft of the machine tool.

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