Vibration reduction plunge milling cutter arbor with large length-diameter ratio

Abstract

The utility model relates to the technical field of plunge milling cutter arbor, and particularly discloses a vibration-damping plunge milling cutter arbor with a large length-diameter ratio, when the plunge milling cutter arbor is used, three bearings at the two ends and the middle part of a cutter body can play a role in restraining a mandrel, so that the mandrel and the cutter body rotate relatively and are always kept on the same axis, thereby avoiding vibration caused by eccentric motion generated by gravity center deflection. Meanwhile, according to the Lenz's law, the mandrel can generate certain induction current when rotating in the annular permanent magnet, part of kinetic energy of rotation is converted into tiny electric energy, energy causing vibration is released in the form of electric energy, and therefore vibration caused by impact is avoided; friction among all the components is reduced while shock absorption is achieved, the effect of prolonging the service life is achieved, the mandrel can be pulled out after the end cover is taken out, meanwhile, the mandrel can take out the connecting clamping block and the annular permanent magnet through the bearing, and maintenance can be conducted after all the components are taken out.

Description

Technical Field

[0001] The utility model relates to the technical field of plunge milling cutter bars, in particular to a large aspect ratio vibration-damping plunge milling cutter bar. Background Art

[0002] Vibration is bound to occur during the plunge milling process. Vibration not only affects the surface quality of the product, but also produces a lot of noise, which can easily cause wear or even damage to the blade, seriously affecting the company's production efficiency.

[0003] Existing Chinese patent: A friction-type vibration-damping plunge milling cutter bar, patent number: CN206550411U, including: a cutter seat, a tray, a friction assembly, a mass ball, a spindle assembly and a cutter body. A cavity is provided at the head of the cutter body, through holes are provided at the middle and tail of the cutter body, the small end of the spindle is located in the cavity of the cutter head, the large end of the spindle is fixed in the inner hole at the tail of the cutter body, and the spindle passes through the through hole in the middle of the cutter body; the cutter seat is connected to the head of the cutter body by a thread; the tray and the cutter body are fixed by a threaded connection, and a blind hole is provided on one side of the tray for placing a permanent magnet; an arc-shaped groove is provided on the friction base for placing a mass ball. A cavity is provided at the head of the cutter body for installing a tray, a friction assembly, a mass ball, a hexagonal nut, and a locking gasket, and the inner hole at the tail of the cutter body is used for installing the large end of the spindle. The utility model can effectively suppress the chatter phenomenon of a tool with a large aspect ratio.

[0004] However, during the implementation of the above technical solution, it was found that at least the following technical problems exist: the above-mentioned plunge milling cutter rod achieves the effect of vibration reduction through the damping generated by friction. When used for a long time, long-term friction will cause wear of various components, thereby reducing the service life of the plunge milling cutter rod. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the utility model provides a large aspect ratio vibration-damping plunge milling cutter bar, which solves the technical problem that the plunge milling cutter bar mentioned above achieves the vibration reduction effect through damping generated by friction, but when used for a long time, long-term friction will cause wear of various components, thereby reducing the service life of the plunge milling cutter bar.

[0007] (II) Technical solution

[0008] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] A large aspect ratio vibration-damping plunge milling cutter bar comprises a cutter body, three limit grooves are evenly arranged inside the cutter body, three connecting blocks are slidably installed inside the limit grooves, annular permanent magnets are fixedly installed inside the connecting blocks, bearings are fixedly installed inside the three connecting blocks, a spindle is fixedly installed on the inner side wall of the bearing, an end cover is installed on the side end of the cutter body, a first bolt is evenly threadedly installed on the end cover, a sleeve is installed on the side end of the spindle, and three first semi-threaded holes are evenly arranged on the side end of the sleeve.

[0010] Preferably, three second half threaded holes are evenly formed on the side end of the spindle.

[0011] Preferably, the interiors of the three first half threaded holes are all threadedly mounted with second bolts.

[0012] (III) Beneficial effects

[0013] 1. When in use, the three bearings at both ends and the middle of the cutter body can constrain the mandrel, so that the relative rotation of the mandrel and the cutter body is always kept on the same axis, thereby avoiding the eccentric motion caused by the deflection of the center of gravity and causing vibration. At the same time, according to Lenz's law, when the mandrel rotates inside the annular permanent magnet, a certain induced current will be generated, and a part of the rotational kinetic energy will be converted into tiny electrical energy, and the energy causing vibration will be released in the form of electrical energy, thereby avoiding vibration caused by impact. Through the relative rotation of the annular permanent magnet and the mandrel, a magnetic damping is formed in the air, which reduces the friction between the components while reducing shock, thereby achieving the effect of increasing the service life.

[0014] 2. When maintenance is needed, first loosen the second bolt and unscrew the three second bolts from the first half threaded hole and the second half threaded hole. The three second bolts connect the sleeve and the spindle together through the first half threaded hole and the second half threaded hole, which can increase the stability of the tool rod during operation. After the second bolt is unscrewed, the sleeve can be taken out, and then the three first bolts can be unscrewed to remove the end cover to expose the interior of the tool body. After taking out the end cover, the spindle can be pulled out, and at the same time, the spindle will also bring out the connecting block and the annular permanent magnet through the bearing. After taking out the various components, maintenance can be carried out. When installing the connecting block back, the three protrusions on the outer wall of the connecting block need to be aligned with the three limit grooves opened in the tool body so that the connecting block can be smoothly installed in place. At the same time, the outer wall of the bearing can be fixed by the connecting block, thereby achieving the effect of easy maintenance and stable use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings.

[0016] Figure 1 This is a structural diagram of the cutter body of the utility model;

[0017] Figure 2 This is a cross-sectional structural diagram of the knife body of the utility model;

[0018] Figure 3 This is a structural diagram of the end cover of the utility model;

[0019] Figure 4 This is a structural diagram of the limit groove of the utility model;

[0020] Figure 5 This is a second bolt structure diagram of the utility model;

[0021] Figure 6 This is a structural diagram of a semi-threaded hole of the utility model.

[0022] Legend: 1. Cutter body; 2. Limiting groove; 3. Connecting block; 4. Annular permanent magnet; 5. Bearing; 6. Mandrel; 7. Sleeve; 8. End cover; 9. First bolt; 11. Second bolt; 12. First half threaded hole; 13. Second half threaded hole. DETAILED DESCRIPTION

[0023] The embodiment of the present application effectively solves the above-mentioned plunge milling cutter bar by providing a large aspect ratio vibration-damping cutter bar, and achieves the vibration reduction effect through the damping generated by friction. When used for a long time, long-term friction will cause wear of various components, reducing the service life of the plunge milling cutter bar. When in use, the three bearings at both ends and the middle of the cutter body can constrain the spindle, so that the relative rotation of the spindle and the cutter body always remains on the same axis, thereby avoiding eccentric motion caused by the deflection of the center of gravity and causing vibration. At the same time, according to Lenz's law, a certain induced current will be generated when the spindle rotates inside the annular permanent magnet, and a part of the rotational kinetic energy will be converted into tiny electrical energy, and the energy that causes vibration will be released in the form of electrical energy, thereby avoiding vibration caused by impact. Through the relative rotation of the annular permanent magnet and the spindle, magnetic damping is formed in the air to reduce the friction between the components while reducing shock, thereby achieving the improvement. The tool body has a long service life. When maintenance is needed, first loosen the second bolt and screw out the three second bolts from the first half threaded hole and the second half threaded hole. The three second bolts connect the sleeve and the spindle together through the first half threaded hole and the second half threaded hole, which can increase the stability of the tool rod during operation. After the second bolt is screwed out, the sleeve can be taken out, and then the three first bolts can be unscrewed to remove the end cover to expose the inside of the tool body. After taking out the end cover, the spindle can be pulled out, and at the same time, the spindle will also bring out the connecting block and the annular permanent magnet through the bearing. After taking out the components, maintenance can be carried out. When installing the connecting block back, the three protrusions on the outer wall of the connecting block need to be aligned with the three limit grooves opened in the tool body so that the connecting block can be smoothly installed in place. At the same time, the outer wall of the bearing can be fixed by the connecting block, which achieves the effect of easy maintenance and stable use.

[0024] Example

[0025] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the technical solution in the embodiment of the present application effectively solves the above-mentioned plunge milling cutter bar, and achieves the effect of vibration reduction through the damping generated by friction. When used for a long time, long-term friction will cause wear of various components, reducing the service life of the plunge milling cutter bar. The overall idea is as follows:

[0026] In view of the problems existing in the prior art, the utility model provides a large aspect ratio vibration-damping plunge milling cutter bar, comprising a cutter body 1, three limit grooves 2 are evenly opened inside the cutter body 1, three connecting blocks 3 are slidably installed inside the limit grooves 2, and an annular permanent magnet 4 is fixedly installed inside the connecting block 3.

[0027] The three connecting blocks 3 are all fixedly installed with bearings 5, the inner wall of the bearing 5 is fixedly installed with a spindle 6, the side end of the cutter body 1 is installed with an end cover 8, and the end cover 8 is evenly threaded with a first bolt 9.

[0028] A sleeve 7 is installed on the side end of the spindle 6, and three first half threaded holes 12 are evenly opened on the side end of the sleeve 7. Three second half threaded holes 13 are evenly opened on the side end of the spindle 6, and second bolts 11 are threadedly installed inside the three first half threaded holes 12.

[0029] Working principle:

[0030] The first step is that when in use, the three bearings 5 ​​at both ends and the middle of the blade body 1 can constrain the spindle 6, so that the spindle 6 and the blade body 1 always rotate relative to each other on the same axis, thereby avoiding the eccentric movement caused by the deflection of the center of gravity and causing vibration. At the same time, according to Lenz's law, when the spindle 6 rotates inside the annular permanent magnet 4, a certain induced current will be generated, and a part of the rotational kinetic energy will be converted into tiny electrical energy, and the energy causing vibration will be released in the form of electrical energy, thereby avoiding vibration caused by impact. Through the relative rotation of the annular permanent magnet 4 and the spindle 6, magnetic damping is formed in the air to reduce the friction between the components while reducing shock, thereby achieving the effect of increasing the service life.

[0031] In the second step, when maintenance is needed, first loosen the second bolt 11, and screw the three second bolts 11 out of the first half threaded hole 12 and the second half threaded hole 13. The three second bolts 11 connect the sleeve 7 and the spindle 6 together through the first half threaded hole 12 and the second half threaded hole 13, which can increase the stability of the tool bar during operation. After the second bolt 11 is screwed out, the sleeve 7 can be taken out, and then the three first bolts 9 are screwed down, and the end cover 8 can be removed to expose the interior of the cutter body 1. After taking out the end cover 8, the spindle 6 can be pulled out, and at the same time, the spindle 6 will also bring out the connecting block 3 and the annular permanent magnet 4 through the bearing 5. After taking out the various components, maintenance can be carried out. When installing the connecting block 3 back, the three protrusions on the outer wall of the connecting block 3 need to be aligned with the three limit grooves 2 opened in the cutter body 1, so that the connecting block 3 can be smoothly installed in place, and at the same time, the outer wall of the bearing 5 can be fixed by the connecting block 3, so as to achieve the effect of easy maintenance and stable use.

[0032] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. A large aspect ratio vibration-damping plunge milling cutter bar, comprising a cutter body (1), characterized in that: The blade body (1) is evenly provided with three limiting grooves (2), three connecting blocks (3) are slidably mounted inside the limiting grooves (2), and an annular permanent magnet (4) is fixedly mounted inside the connecting block (3).

2. A large aspect ratio vibration-damping plunge milling cutter bar as claimed in claim 1, characterized in that: A bearing (5) is fixedly mounted inside each of the three connecting blocks (3), and a spindle (6) is fixedly mounted on the inner side wall of the bearing (5).

3. A large aspect ratio vibration-damping plunge milling cutter bar as claimed in claim 1, characterized in that: An end cover (8) is installed on the side end of the knife body (1).

4. A large aspect ratio vibration-damping plunge milling cutter bar as claimed in claim 3, characterized in that: The end cover (8) is evenly threadedly mounted with a first bolt (9).

5. A large aspect ratio vibration-damping plunge milling cutter bar as claimed in claim 2, characterized in that: A sleeve (7) is installed on the side end of the spindle (6).

6. A large aspect ratio vibration-damping plunge milling cutter bar as claimed in claim 5, characterized in that: The side end of the sleeve (7) is evenly provided with three first half threaded holes (12).

7. A large aspect ratio vibration-damping plunge milling cutter bar as claimed in claim 2, characterized in that: Three second half threaded holes (13) are evenly formed on the side end of the spindle (6).

8. A large aspect ratio vibration-damping plunge milling cutter bar as claimed in claim 6, characterized in that: Second bolts (11) are threadedly installed inside the three first half threaded holes (12).

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