Milling cutter for processing large woodcarving furniture

Abstract

The invention relates to a milling cutter for processing large woodcarving furniture, and belongs to the field of furniture processing. The milling cutter for processing the large woodcarving furniture comprises a milling cutter body, wherein the milling cutter body comprises a cutter handle, a cutting edge part and an excitation shaft assembly for applying horizontal excitation force to the milling cutter body. The shock excitation shaft assembly comprises a long shaft, the long shaft comprises a shaft handle located above the cutter handle and an optical shaft coaxially connected with the shaft handle, and the lower end of the optical shaft is fixedly connected with a plurality of eccentric blocks. According to the milling cutter, an existing milling cutter structure is optimally designed, horizontal exciting force is applied to the milling cutter body by installing the exciting shaft assembly, so that the chip removal effect during milling is remarkably improved, the milling cutter is particularly suitable for milling deep holes, and the phenomenon that a milling surface is burnt is avoided. In addition, the device can be used for long-time continuous milling operation, and the implementation effect is good.

Description

Technical Field

[0001] The invention relates to the technical field of furniture processing, in particular to a milling cutter for processing large-scale wood-carved furniture. Background Art

[0002] In the furniture field, large woodcarving furniture, especially three-dimensional round-carved furniture, is large in size, and the maximum carving section is usually more than 1m 2 The processing process is very complicated, and it is very strict from material selection to rough processing.

[0003] For this type of large woodcarving furniture, the original wood is cut, roughly polished, and roughly milled into a wood blank, and then surface treated as needed before the next step of carving and subsequent processing can be carried out. For the wood blanks of this type of large woodcarving furniture, the milling cutter used for rough milling is much larger than the milling cutter on a general milling machine, and the diameter of its handle / cutter head is generally more than 3cm. Although such a large milling cutter has a high processing efficiency, it usually has the defect of poor chip removal, and generally requires compressed air to assist in blowing wood chips. However, for a blank that is too thick, if the milling action exceeds 3cm in processing depth, it must be milled for a period of time, and then the milling must be stopped or the milling cutter speed must be reduced, and other means must be used to assist in chip removal, otherwise, it is easy to cause the milling surface to burn.

[0004] Based on this, the present invention is proposed. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a milling cutter for processing large-scale woodcarving furniture, and its technical solution is as follows:

[0006] A milling cutter for processing large-scale wood-carved furniture comprises a milling cutter body, wherein the milling cutter body comprises a cutter handle and a cutting edge portion, and also comprises an exciting shaft assembly for applying a horizontal exciting force to the milling cutter body.

[0007] As a further solution of the present invention, an eccentric block rotating cavity is arranged in the center of the handle of the tool handle, the exciting shaft assembly includes a long axis, the long axis includes a shaft handle located above the tool handle, an optical axis coaxially connected to the shaft handle, a plurality of eccentric blocks are fixedly connected to the lower end of the optical axis, and the eccentric blocks are all located inside the eccentric block rotating cavity; the optical axis is rotatably connected to the upper end of the tool handle.

[0008] As a further solution of the present invention, a bearing is embedded in the upper end of the tool handle, and the optical axis and the tool handle are rotatably connected by installing the bearing.

[0009] As a further solution of the present invention, a T-shaped hole for installing a bearing is provided at the upper end of the shank, and the T-shaped hole is connected to the rotating cavity of the eccentric block.

[0010] As a further solution of the present invention, three eccentric blocks are provided.

[0011] As a further solution of the present invention, the inner wall of the eccentric mass rotating cavity is provided with a spiral groove.

[0012] As a further solution of the present invention, when the rotation direction of the spiral groove is clockwise, the rotation direction of the optical axis is counterclockwise.

[0013] As a further solution of the present invention, the rotation speed of the milling cutter body is greater than the rotation speed of the long shaft.

[0014] As a further solution of the present invention, the orthographic projections of two upper and lower adjacent eccentric blocks are arranged to partially overlap.

[0015] As a further solution of the present invention, the rotating chamber of the eccentric block is filled with a non-Newtonian fluid.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The milling cutter for processing large-scale wood-carved furniture described in the present invention optimizes the existing milling cutter structure and applies horizontal exciting force to the milling cutter body by installing an exciting shaft assembly, thereby significantly improving the chip removal effect during milling, and is particularly suitable for milling deep holes (hole depth exceeding 3 cm) without the phenomenon of the milling surface being burnt. In addition, it can be used for long-term continuous milling operations with good implementation effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure is a schematic diagram of the structure of a milling cutter for processing large-scale wood-carved furniture.

[0019] Figure 2 It is a schematic diagram of the connection between the milling cutter body and the exciting shaft assembly.

[0020] Figure 3 Schematic diagram of the interior of the milling cutter body.

[0021] Figure 4 Schematic diagram of the orthographic projection of three eccentric blocks.

[0022] Figure 5 It is a curve diagram of the change of K value and relative burning rate P1. DETAILED DESCRIPTION

[0023] The present invention is described in detail below in conjunction with specific embodiments. The embodiments described below are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0024] Example 1

[0025] A milling cutter for processing large woodcarving furniture, such as Figure 1, 2 As shown, the milling cutter body 10 includes a shank 11 and a cutting edge portion 12 .

[0026] A milling cutter for processing large-scale wood-carved furniture further comprises a vibration shaft assembly 20 for applying a horizontal vibration force to the milling cutter body 10 .

[0027] The exciting shaft assembly 20 is an exciting source, which can provide horizontal exciting force to the milling cutter body 10 when started, so as to promote chip removal during milling, and is particularly suitable for milling deep holes (hole depth exceeds 3cm), and the milling surface will not be burned. In addition, continuous milling can be performed for a long time, and can be performed continuously for 19 minutes without stopping milling or reducing the milling cutter speed. Only low-pressure compressed air (pressure is 1-4bar) is needed to blow away the wood chips accumulated on the surface of the blank, and there is no need to use high-pressure compressed air (pressure greater than 30bar) to align the milling cutter mouth to assist in chip removal.

[0028] Example 2

[0029] Based on Example 1, Figures 2 to 4 As shown, an eccentric block rotating cavity 13 is provided at the center of the handle of the tool handle 11, and the exciting shaft assembly 20 includes a long axis, and the long axis includes a shaft handle 21 located above the tool handle 11, and an optical axis 22 coaxially connected to the shaft handle 21, and a plurality of eccentric blocks 23 are fixedly connected to the lower end of the optical axis 22, and the eccentric blocks 23 are all located inside the eccentric block rotating cavity 13; the optical axis 22 is rotatably connected to the upper end of the tool handle 11.

[0030] In this example, the tool handle 11 is connected to an external power head, and the shaft handle 21 is connected to another external power head. The two rotate under the drive of their respective power heads without interfering with each other; the rotation speed of the milling cutter body 10 is not equal to the rotation speed of the long axis, so that there is relative rotation between the optical axis 22 and the tool handle 11. In this way, the optical axis 22 drives the eccentric block 23 to rotate, generating centrifugal force, thereby causing the milling cutter body 10 to generate high-frequency vibration. Such a design makes the excitation direction horizontal vibration rather than vertical vibration. If vertical vibration is generated, it will not only be of little help in promoting chip removal, but also easily damage the tool handle 11, and it is also easy to cause safety hazards.

[0031] Among them, the rotation speed of the milling cutter body 10 is generally 600-1200r / min, and the rotation speed of the long shaft is generally 300-800r / min; the rotation speed of the long shaft needs to be less than the rotation speed of the milling cutter body 10. On the one hand, it is mainly considered that the long shaft is limited by volume and its rotation speed cannot be too high, otherwise it is prone to fatigue and aging; on the other hand, many studies have found that if the rotation speed of the long shaft is greater than the rotation speed of the milling cutter body 10, it will cause excessive exciting force and easily generate resonance. Not only will the subsequent bearing 30 be easily damaged, but the milling cutter body 10 and the long shaft have a certain probability of breaking. Once the high-speed rotating milling cutter body 10 breaks, there is a huge safety risk.

[0032] Example 3

[0033] In the second embodiment, a bearing 30 is embedded in the upper end of the tool handle 11 , and the optical axis 22 and the tool handle 11 are rotatably connected by installing the bearing 30 .

[0034] In some embodiments, in order to facilitate the installation of the bearing 30 , a T-shaped hole 15 for installing the bearing 30 is provided at the upper end of the shank 11 , and the T-shaped hole 15 is communicated with the eccentric block rotating chamber 13 .

[0035] Example 4

[0036] In Embodiment 2, three eccentric blocks 23 are provided. The inner wall of the eccentric block rotating chamber 13 is provided with a spiral groove 14 .

[0037] During processing, the T-shaped hole 15 is processed first, then the eccentric block rotating cavity 13 is processed, and then the spiral groove 14 is processed by a boring tool. When installing the eccentric block 23, the optical axis 22 with the bearing 30 and the eccentric block 23 installed is passed through the T-shaped hole 15 and extended into the eccentric block rotating cavity 13, and then the eccentric block rotating cavity 13 is filled with non-Newtonian fluid, and finally the bearing 30 is installed for sealing.

[0038] The eccentric block rotating chamber 13 is filled with a non-Newtonian fluid. If starch and water are used in a ratio of 1:3, a non-Newtonian fluid can also be made, but there are two disadvantages. One is that water may cause rust in the eccentric block rotating chamber 13 after long-term use; therefore, an organic solvent is preferred. On the other hand, the initial viscosity of the non-Newtonian fluid of the starch-water system is still relatively low and not viscous enough, and a higher rotation speed is required to achieve the "hardening" effect.

[0039] Therefore, after a large number of experiments, the non-Newtonian fluid used in the present invention is prepared by mixing starch, acetone, iron filings and calcium-based grease in a mass ratio of 2.5:1:0.2:0.07.

[0040] When the rotation direction of the spiral groove 14 is clockwise, the rotation direction of the optical axis 22 is counterclockwise.

[0041] The orthographic projections of two upper and lower adjacent eccentric blocks 23 are partially overlapped, and the ratio of the overlapping area to the orthographic projection of the eccentric block 23 is K, and K is preferably 11%.

[0042] Example 5

[0043] The only difference between this example and Example 4 is that in this example, when the rotation direction of the spiral groove 14 is clockwise, the rotation direction of the optical axis 22 is also clockwise, and the rest are the same.

[0044] Example 6

[0045] The only difference between this example and embodiment 4 is that in this example, the spiral groove 14 is not provided, and the rest are the same.

[0046] Example 7

[0047] The only difference between this example and Example 4 is that in this example, the major axis does not rotate, and the rest is the same.

[0048] Example 8

[0049] In this example, the orthographic projections of the two adjacent eccentric blocks 23 are tested according to whether they overlap. If they overlap, the ratio of the overlapping area to the orthographic projection of the eccentric block 23 is K. The K value changes. According to the "Milling Cutter Chip Removal Performance Characterization Test", the test is carried out continuously for 15 minutes. The corresponding relative scorch rate P1 change curve is shown in Figure 5 ,Depend on Figure 5 It can be seen that K is preferably 11%.

[0050] 《Test for characterization of chip removal performance of milling cutter》

[0051] A birch trunk was used as a test wood blank, and a milling cutter (a milling cutter for processing large woodcarving furniture as described in Example 4) was used for milling. The milling depth was 5 cm, and the milling was continuous for 10 to 30 minutes. During milling, compressed air with an air pressure of 2 bar was used to blow away the wood chips near the milling cutter to prevent wood chips from accumulating. After the milling operation is completed, compressed air is continued to be used to clean the milling groove (the serpentine groove obtained by the milling cutter on the wood blank), and then the dust on the surface of the milling groove is wiped dry with a wet rag. Observe whether there is a charred black area on the surface of the milling groove. If so, the area of ​​the charred black area is calculated by the grid method, and the total area of ​​all the charred black areas in the milling groove is accumulated and calculated as S1. The surface area of ​​the milling groove is S0. Relative charring rate P1 = 2000*S1 / S0. Because it was found in the experiment that there is almost no charring in the first 3 minutes of milling, and the charred area is limited, therefore, for the convenience of comparison, it is characterized by the relative charring rate P1. The test results are shown in Table 1:

[0052] Table 1

[0053]

[0054] Example 9

[0055] The only difference between this example and Example 4 is that in this example, the non-Newtonian fluid is replaced by water, and the rest is the same.

[0056] Example 10

[0057] The only difference between this example and Example 4 is that in this example, the non-Newtonian fluid is replaced by air (that is, the eccentric mass rotating chamber 13 is empty), and the rest are the same.

[0058] 《Milling cutter stability characterization test》

[0059] The rotation speed of the milling cutter body 10 is 1200r / min, and the rotation speed of the long axis is 800r / min; first measure the decibel value of the maximum noise when milling the wood blank, represented by A0. Then, at the above rotation speed, mill the limestone. After the cumulative milling time is 100h, the milling cutter is subjected to a high-intensity fatigue test; after that, use the milling cutter to mill the wood blank again, and measure the decibel value of the maximum noise when milling the wood blank, represented by A1. ΔA=A1–A0. The larger ΔA is, the more unstable the system of the milling cutter is after the high-intensity fatigue test. When rotating at high speed, it will emit a harsh and abnormal noise, which is not conducive to the stability of the milling cutter operation. The test results are shown in Table 2:

[0060] Table 2

[0061]

[0062]

[0063] In Table 2, the reference example is a conventional milling cutter, and its shank 11 is processed into a hollow shank.

[0064] In the present invention, the main factor affecting ΔA is the wear caused by long-term eccentric vibration. If the wear is too great, it is easy to cause system instability, thereby generating harsh noise.

[0065] Embodiment 11

[0066] The only difference between this example and Example 4 is that the non-Newtonian fluid used in this example is prepared by mixing starch, acetone, and iron filings in a mass ratio of 2.57:1:0.2; the rest are the same.

[0067] Example 12

[0068] The only difference between this example and Example 4 is that the non-Newtonian fluid used in this example is prepared by mixing starch, acetone, iron filings and soybean oil in a mass ratio of 2.5:1:0.2:0.07.

[0069] 《Non-Newtonian Fluid Characterization Experiment》

[0070] The viscosity and shear rate of the fluid were measured using a rheometer. The results are shown in Table 3:

[0071] Table 3

[0072]

[0073] It can be seen from Table 3 that the viscosity of the non-Newtonian fluid in Example 4 increases dramatically with the increase of shear rate. This property enables the non-Newtonian fluid to still exert a certain level of exciting force transmission effect when the rotational speed difference between the milling cutter body 10 and the long axis changes, and also meet the milling requirements of the milling cutter body 10 at different rotational speeds.

[0074] In addition, it should be understood that those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A milling cutter for processing large-scale wood-carved furniture, comprising a milling cutter body (10), wherein the milling cutter body (10) comprises a handle (11) and a blade portion (12), characterized in that: It also includes an exciting shaft assembly (20) for applying a horizontal exciting force to the milling cutter body (10).

2. A milling cutter for processing large-scale woodcarving furniture according to claim 1, characterized in that: An eccentric block rotating chamber (13) is arranged at the center of the handle of the tool handle (11); the exciting shaft assembly (20) comprises a long axis, the long axis comprises a shaft handle (21) located above the tool handle (11), and an optical axis (22) coaxially connected to the shaft handle (21); a plurality of eccentric blocks (23) are fixedly connected to the lower end of the optical axis (22); the eccentric blocks (23) are all located inside the eccentric block rotating chamber (13); the optical axis (22) is rotatably connected to the upper end of the tool handle (11).

3. A milling cutter for processing large-scale wood-carved furniture according to claim 2, characterized in that: A bearing (30) is embedded in the upper end of the knife handle (11), and the optical axis (22) and the knife handle (11) are rotatably connected by installing the bearing (30).

4. A milling cutter for processing large-scale wood-carved furniture according to claim 3, characterized in that: The upper end of the knife handle (11) is provided with a T-shaped hole (15) for installing a bearing (30), and the T-shaped hole (15) is communicated with the eccentric block rotating chamber (13).

5. The milling cutter for processing large-scale wood-carved furniture according to claim 1, characterized in that: The eccentric blocks (23) are provided in three pieces.

6. A milling cutter for processing large-scale wood-carved furniture according to claim 2, characterized in that: The inner wall of the eccentric block rotating chamber (13) is provided with a spiral groove (14).

7. A milling cutter for processing large-scale wood-carved furniture according to claim 6, characterized in that: When the rotation direction of the spiral groove (14) is clockwise, the rotation direction of the optical axis (22) is counterclockwise.

8. The milling cutter for processing large-scale wood-carved furniture according to claim 2, characterized in that: The rotation speed of the milling cutter body (10) is greater than the rotation speed of the long shaft.

9. A milling cutter for processing large-scale wood-carved furniture according to claim 5, characterized in that: The orthographic projections of two upper and lower adjacent eccentric blocks (23) are arranged to partially overlap.

10. The milling cutter for processing large-scale wood-carved furniture according to claim 1, characterized in that: The eccentric block rotating chamber (13) is filled with a non-Newtonian fluid.

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