A highly wear-resistant power head spindle

Abstract

The utility model provides a highly wear-resistant power head spindle, including a spindle, a boss is formed on the spindle, with the boss as a boundary, a spindle front end is formed on one side of the boss, and a spindle body is formed on the other side, a bearing position is provided on the spindle body, a ceramic wear-resistant layer is fused and embedded on the bearing position, and the outer periphery of the ceramic wear-resistant layer is flush with the outer periphery of the bearing position. The utility model first opens an annular groove on the bearing position of the spindle body of the power head spindle, and then uses flame spraying or flame spraying technology to spray molten ceramic particles into the annular groove, and numerous tiny molten ceramic particles collide with the annular groove and then melt, deposit and stack to form a lamellar superimposed deposition coating, and finally form a dense ceramic wear-resistant layer integrated with the spindle body, so that the bearing position of the spindle body engaged with the bearing has stronger wear resistance and stronger corrosion resistance, and a long service life.

Description

Technical Field

[0001] The utility model relates to the technical field of shaft components, in particular to a high-wear-resistant power head main shaft. Background Art

[0002] The power head is a power component that can realize the main motion and feed motion, and has automatic workpiece circulation. Its basic principle is that the motor drives a gear speed change mechanism, which can realize boring, milling, drilling and other functions. Some have guide rails and can move linearly in a small range. There are many components of the power head, among which the more important one is the main shaft that plays the role of transmission, also known as the power head spindle.

[0003] The spindle of the power head will produce friction during the transmission process. After long-term use, the bearing surface will be worn, which will increase the swing between the bearing and the shaft and reduce the grinding accuracy. At the same time, the current mainstream power head spindle has low wear resistance, which makes the power head run continuously at a high speed of 10,000 to 12,000, which will cause bearing damage and then damage the turning and milling composite CNC power head. There are several common solutions:

[0004] 1. Heat treatment of the shaft to improve the rigidity and wear resistance of the spindle body. This technical solution is disclosed in the patent with announcement number CN215033665U, but heat treatment cannot significantly improve the rigidity and wear resistance of the spindle body;

[0005] 2. Plating the shaft, electroplating a wear-resistant layer such as nickel and chromium on a part of the shaft to improve the wear resistance. This technical solution is disclosed in the patent with the announcement number CN217761685U, but the plating layer is often easily worn away;

[0006] 3. Apply a coating to the outer surface of the spindle body, such as epoxy wear-resistant coating, high-temperature wear-resistant ceramic coating, boron phosphide wear-resistant coating. This technical solution is disclosed in the patent with announcement number CN217990953U, but the coating is often easily worn away;

[0007] 4. A wear-resistant end sleeve is provided. The end of the spindle body is protected by the wear-resistant end sleeve, wear-resistant coating, ring groove and anti-slip mechanism. Mechanical friction acts on the wear-resistant end sleeve. After the wear-resistant end sleeve is damaged due to wear, only the wear-resistant end sleeve needs to be replaced, thereby improving the service life of the spindle body. This technical solution is disclosed in the patent with announcement number CN217761685U, but the wear of the power head spindle often does not occur at the end, so the end sleeve often does not play a role.

[0008] In view of the above problems, the applicant has proposed a solution. Utility Model Content

[0009] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a high wear-resistant power head spindle. The specific technical solution is as follows:

[0010] A highly wear-resistant power head spindle comprises a spindle, on which a boss is formed, with a spindle front end formed on one side of the boss and a spindle body formed on the other side, with a bearing seat provided on the spindle body, a ceramic wear-resistant layer fused and embedded in the bearing seat, and an outer periphery of the ceramic wear-resistant layer being flush with an outer periphery of the bearing seat.

[0011] According to a highly wear-resistant power head spindle of an embodiment of the utility model, the front end of the spindle includes a first shaft section and a second shaft section.

[0012] According to a highly wear-resistant power head spindle of an embodiment of the utility model, the spindle shaft body is sequentially formed with a third shaft segment, a fourth shaft segment, a fifth shaft segment, a sixth shaft segment, a seventh shaft segment and an eighth shaft segment in the outward extension area from one side of the shoulder, the fifth shaft segment and the seventh shaft segment are bearing segments, and ceramic wear-resistant layers are fused and embedded on the fifth shaft segment and the seventh shaft segment respectively.

[0013] According to a highly wear-resistant power head spindle of an embodiment of the utility model, annular grooves are respectively provided on the fifth shaft segment and the seventh shaft segment, and a ceramic wear-resistant layer is fused and embedded in the annular grooves.

[0014] According to a highly wear-resistant power head spindle of an embodiment of the utility model, the depth of the annular groove is 0.6 mm.

[0015] According to a highly wear-resistant power head spindle of an embodiment of the utility model, the ceramic wear-resistant layer is an alumina composite ceramic layer.

[0016] According to a highly wear-resistant power head spindle of an embodiment of the utility model, the diameter of the first shaft section is greater than the diameter of the second shaft section.

[0017] According to a highly wear-resistant power head spindle of an embodiment of the utility model, the diameters of the third shaft segment, the fourth shaft segment, the fifth shaft segment, the sixth shaft segment, the seventh shaft segment and the eighth shaft segment decrease in sequence.

[0018] According to a highly wear-resistant power head spindle of an embodiment of the utility model, a plurality of connection grooves are arranged in a circumferential array on the first shaft segment for engaging with a wrench.

[0019] According to a highly wear-resistant power head spindle of an embodiment of the utility model, a connecting hole is opened in the spindle located on one side of the second shaft section.

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] The utility model firstly opens an annular groove on the bearing position of the main shaft body of the power head main shaft, and then uses flame spray welding or flame spraying technology to spray molten ceramic particles into the annular groove. After a large number of tiny molten ceramic particles hit the annular groove, they are melted, deposited and stacked to form a sheet-like superimposed deposition coating, and finally form a dense ceramic wear-resistant layer integrated with the main shaft body, so that the bearing position of the main shaft body engaged with the bearing has stronger wear resistance and stronger corrosion resistance, and a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 This is a schematic structural diagram of a highly wear-resistant power head spindle of the utility model;

[0024] Figure 2 The utility model is a schematic cross-sectional view of a high wear-resistant power head spindle.

[0025] Description of main component symbols:

[0026] 1. Main shaft; 10. Boss; 11. First shaft section; 12. Second shaft section; 13. Connecting hole; 14. Connecting groove; 15. Third shaft section; 16. Fourth shaft section; 17. Fifth shaft section; 18. Sixth shaft section; 19. Seventh shaft section; 20. Eighth shaft section; 21. Ceramic wear-resistant layer. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0028] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] The utility model provides a high-wear-resistant power head spindle, including a spindle 1, a boss 10 is formed on the spindle 1, with the boss 10 as the boundary, a spindle front end is formed on one side of the boss 10, and a spindle shaft body is formed on the other side, a bearing position is provided on the spindle shaft body, a ceramic wear-resistant layer 21 is fused and embedded on the bearing position, and the outer periphery of the ceramic wear-resistant layer 21 is flush with the outer periphery of the bearing position.

[0032] During processing, the spindle body is first heat treated, and then ceramic particles are formed into a mist and sprayed onto the spindle body through flame spraying technology. The numerous tiny molten ceramic particles sprayed hit the spindle body, melt, deposit and stack on the spindle body, and form a ceramic wear-resistant layer integrated with the spindle body on the bearing position.

[0033] Specifically, according to a highly wear-resistant power head spindle of an embodiment of the utility model, Figure 1 , 2 As shown, the main shaft body is sequentially formed with a third shaft segment 15, a fourth shaft segment 16, a fifth shaft segment 17, a sixth shaft segment 18, a seventh shaft segment 19 and an eighth shaft segment 20 in the area extending outward from one side of the boss 10. The fifth shaft segment 17 and the seventh shaft segment 19 are bearing segments, and ceramic wear-resistant layers 21 are fused and embedded in the fifth shaft segment 17 and the seventh shaft segment 19, respectively.

[0034] During processing, annular grooves are respectively provided on the fifth shaft segment 17 and the seventh shaft segment 19, and a ceramic wear-resistant layer 21 is fused and embedded in the annular grooves. The ceramic wear-resistant layer 21 is an alumina composite ceramic layer. The specific operation is as follows:

[0035] S1, heat treating the bearing segments of the main shaft body, namely the fifth shaft segment 17 and the seventh shaft segment 19, so as to improve the surface hardness of the fifth shaft segment 17 and the seventh shaft segment 19 of the main shaft body;

[0036] S2, grinding the fifth shaft segment 17 and the seventh shaft segment 19 to remove the surface oxide layer;

[0037] S3, processing the fifth shaft segment 17 and the seventh shaft segment 19, forming annular grooves on the fifth shaft segment 17 and the seventh shaft segment 19 respectively. Generally, the depth of the annular groove is 0.6 mm. For example, if the diameter of the fifth shaft segment is 25 mm, the depth of the annular groove thereon is 0.6 mm, and if the diameter of the seventh shaft segment is 20 mm, the depth of the annular groove thereon is 0.6 mm;

[0038] S4, sandblasting the annular groove to make its surface rough;

[0039] S5, prepare a ceramic rod, use flame spray welding or flame spraying technology to heat the ceramic rod to a molten state, and under the impetus of high-speed airflow, ceramic particles form a mist flow and are sprayed into the annular groove. The sprayed numerous tiny molten particles collide with the annular groove to produce plastic deformation, and the ceramic particles are melted, deposited and stacked to form a sheet-like superimposed deposition coating, forming a ceramic wear-resistant layer 21 integrated with the fifth shaft segment 17 (and the seventh shaft segment 19);

[0040] S6. Grinding the formed ceramic wear-resistant layer 21 to ensure that the precision of the ceramic wear-resistant layer 21 meets the designed assembly requirements.

[0041] The utility model first opens an annular groove on the bearing position of the main shaft body of the power head main shaft, and then uses flame spraying or flame spraying technology to spray molten ceramic particles into the annular groove. After numerous tiny molten ceramic particles hit the annular groove, they are melted, deposited and stacked to form a sheet-like superimposed deposition coating, and finally form a dense ceramic wear-resistant layer 21 integrated with the main shaft body. Since the depth of the annular groove is relatively deep, which is 0.6mm, the thickness of the formed ceramic wear-resistant layer 21 is also relatively thick, which can provide sufficient wear support, so that the bearing position of the main shaft body engaged with the bearing has stronger wear resistance and stronger corrosion resistance, and a long service life.

[0042] It should be noted that after the two alumina composite ceramic layers are formed, wear resistance and hardness tests are required. We use a wheel friction loss test to test the wear resistance of the alumina composite ceramic layer material. The parameters of the wheel friction loss test are as follows: a load of 25N is applied to the alumina composite ceramic layer, and 180-mesh sandpaper is used to perform 5 times X 400 double strokes / times (a total of 2000 strokes) on the ceramic layer. The wear loss of the added alumina composite ceramic layer is the first time: 0.0268g, the second time: 0.0273g, the third time: 0.0236g, the fourth time: 0.0198g, and the fifth time: 0.0196g. It can be seen from the above data that the alumina composite ceramic coating can indeed increase the wear resistance of the power head spindle.

[0043] It should be noted that after the two alumina composite ceramic layers are formed, hardness and insulation tests are required. The voltage resistance of the alumina composite ceramic layer is 600VAC / 50Hz, ensuring that it will not be broken down by the cover voltage within one minute, and at the same time there is no electric spark flashing, the leakage current cannot exceed 5 mA, the insulation resistance is ≥5MΩ at 500VDC, and the hardness of the alumina composite ceramic layer is ≥HRC60 for a passed product.

[0044] Since the alumina composite ceramic layer is in an insulating state, it can effectively eliminate the arc generated during the operation of the DC motor, thereby protecting the grease in the bearing from being penetrated by the arc, making the bearing have a longer life. At the same time, it can also eliminate the damage of the arc to the circuit board components, thereby playing a unified protective role for the power head spindle, bearings and circuit boards.

[0045] The bonding strength between the alumina composite ceramic layer and the spindle shaft is tested through high and low temperature impact tests. The high and low temperature are switched between -40℃ and 155℃, and maintained for one hour at -40℃ and one hour at 155℃. Each switching time is within 1 minute. This cycle is repeated 10 times. If there is no crack in the alumina composite ceramic layer and no reduction in insulation resistance after the test, it is a qualified product.

[0046] It is understandable that the surface of the spindle shaft after machining should be smooth, without defects such as knocks and scratches, and finally the surface is coated with anti-rust oil to improve the anti-rust ability. The resulting alumina composite ceramic layer has high wear resistance and high corrosion resistance.

[0047] The power head spindle provided by the utility model is mainly used in the transmission spindles of the end face milling power head and the radial milling power head in the turning and milling compound CNC lathe.

[0048] According to a highly wear-resistant power head spindle of an embodiment of the utility model, Figure 1 , 2As shown, the diameters of the third shaft segment 15 , the fourth shaft segment 16 , the fifth shaft segment 17 , the sixth shaft segment 18 , the seventh shaft segment 19 and the eighth shaft segment 20 decrease in sequence.

[0049] According to a highly wear-resistant power head spindle of an embodiment of the utility model, Figure 1 , 2 As shown, the front end of the spindle includes a first shaft section 11 and a second shaft section 12, and the diameter of the first shaft section 11 is larger than that of the second shaft section 12; a plurality of connecting grooves 14 are arranged in a circumferential array on the first shaft section 11 for engaging with a wrench, and are used for quick disassembly and assembly through a wrench when connecting to a turning and milling compound power head, and a connecting hole 13 is arranged in the spindle on one side of the second shaft section 12, and a butt connection is performed through the connecting hole 13.

[0050] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprising a reference structure" do not exclude the presence of other identical elements in the process, method, article or device including the elements.

Claims

1. A highly wear-resistant power head spindle, characterized in that: The invention comprises a main shaft (1), wherein a boss (10) is formed on the main shaft (1), and a main shaft front end is formed on one side of the boss (10), and a main shaft body is formed on the other side of the boss (10), with the boss (10) as a boundary. A bearing seat is provided on the main shaft body, and a ceramic wear-resistant layer (21) is fused and embedded in the bearing seat, and the outer periphery of the ceramic wear-resistant layer (21) is flush with the outer periphery of the bearing seat.

2. The highly wear-resistant power head spindle according to claim 1, characterized in that: The main shaft body is formed with a third shaft segment (15), a fourth shaft segment (16), a fifth shaft segment (17), a sixth shaft segment (18), a seventh shaft segment (19) and an eighth shaft segment (20) in sequence in an area extending outward from one side of the boss; the fifth shaft segment (17) and the seventh shaft segment (19) are bearing segments, and ceramic wear-resistant layers (21) are fused and embedded in the fifth shaft segment (17) and the seventh shaft segment (19), respectively.

3. The highly wear-resistant power head spindle according to claim 2, characterized in that: Annular grooves are respectively provided on the fifth shaft segment (17) and the seventh shaft segment (19), and ceramic wear-resistant layers (21) are fused and embedded in the annular grooves.

4. The highly wear-resistant power head spindle according to claim 3, characterized in that: The depth of the annular groove is 0.6 mm.

5. The highly wear-resistant power head spindle according to claim 1, characterized in that: The ceramic wear-resistant layer (21) is an alumina composite ceramic layer.

6. The highly wear-resistant power head spindle according to claim 1, characterized in that: The front end of the main shaft comprises a first shaft section (11) and a second shaft section (12).

7. The highly wear-resistant power head spindle according to claim 6, characterized in that: The diameter of the first shaft section (11) is greater than the diameter of the second shaft section (12).

8. The highly wear-resistant power head spindle according to claim 2, characterized in that: The diameters of the third shaft segment (15), the fourth shaft segment (16), the fifth shaft segment (17), the sixth shaft segment (18), the seventh shaft segment (19) and the eighth shaft segment (20) decrease in sequence.

9. The highly wear-resistant power head spindle according to claim 6, characterized in that: A plurality of connection grooves (14) are arranged in a circumferential array on the first shaft section (11) for engaging with a wrench.

10. The highly wear-resistant power head spindle according to claim 6, characterized in that: A connecting hole (13) is provided in the main shaft (1) located on one side of the second shaft section (12).

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