Ceramic reamer for machining bearing hole of new energy motor shell and machining process

Abstract

The invention discloses a ceramic reamer for machining a bearing hole of a new energy motor shell. The ceramic reamer comprises a handle part and a reamer body arranged at one end of the handle part. The other end of the handle part is used for being connected with a cutter handle and connected with a machine tool spindle through the cutter handle. A plurality of ceramic cutting edges are arranged on the cutter body in the circumferential direction, and a calibration ring and a diameter adjusting device are further arranged on the cutter body. The calibration ring is annular, sleeves the outer part of one end, close to the handle part, of the cutter body, and is in interference fit with the end part of the cutter body; the diameter adjusting device comprises an adjusting mandrel arranged in the middle of the cutter body and a conical ring structure. The invention further discloses a motor shell bearing hole machining method adopting the ceramic reamer. The ceramic cutting edge is matched with the calibration function and the diameter adjusting function, the machining life of the cutter can be prolonged, and the machining precision of the bearing hole is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy motor housings, and in particular relates to a ceramic reamer and a processing technology for machining a bearing hole of a new energy motor housing. Background Art

[0002] The market share of new energy vehicles is gradually increasing, and the development trend of new energy vehicles is unstoppable. The motor housing is an indispensable component of new energy vehicles. At present, the material of the motor housing is generally 45 steel, so processing the bearing hole (steel sleeve hole) of the motor housing is a very important part.

[0003] The use of 45 steel for the bearing hole of the motor housing has certain advantages and characteristics: High strength: It can withstand various loads generated during the operation of the motor and ensure the structural stability of the bearing hole. Good processing performance: It is easier to obtain the required dimensional accuracy and surface quality through turning, milling, boring and other processing processes. Relatively low price: Compared with some special alloy steels, the cost of 45 steel is more economical and suitable for large-scale production applications.

[0004] However, the hardness of 45 steel is relatively high, which requires the tool to withstand greater cutting force during cutting, which not only places higher requirements on the power of the machine tool, but also easily causes wear of the tool; and 45 steel has good toughness, which makes it difficult for the chips to break during the formation process. The chips are likely to appear in a continuous strip shape, which may be entangled on the tool, affecting the normal progress of the machining process and may also damage the quality of the machined surface; in addition, 45 steel has a complex metallographic structure and high strength and toughness, but it also leads to a large deformation resistance of the material during the cutting process. During the drilling process, the drill bit needs to overcome a large material resistance to cut into the material, which easily causes wear and breakage of the drill bit.

[0005] Ceramic reamers have the following advantages when processing 45 steel: Ceramic reamers have the advantages of high hardness, high wear resistance and high temperature resistance. This enables it to maintain good cutting performance during the processing and is not easy to wear, thereby improving processing accuracy and surface quality. At the same time, ceramic tools have good chemical stability and are not easy to react chemically with the workpiece material, reducing tool wear and workpiece contamination.

[0006] However, after being used a certain number of times, the diameter of the ceramic reamer will gradually decrease due to the continuous wear of the cutting edge, and it will no longer meet the requirements for the processing of the workpiece bearing hole, affecting the processing life of the tool. In addition, current ceramic reamers often do not have a calibration function, and the processing accuracy cannot be guaranteed. Summary of the invention

[0007] In response to one or more of the above-mentioned defects or improvement needs in the prior art, the present invention provides a ceramic reamer and a processing technology for processing the bearing hole of a new energy motor housing. The ceramic cutting edge is combined with a calibration function and a diameter adjustment function to improve the tool processing life and ensure the processing accuracy of the bearing hole.

[0008] To achieve the above object, according to one aspect of the present invention, there is provided a ceramic reamer for machining a bearing hole of a new energy motor housing, comprising a shank and a cutter body arranged at one end of the shank; The other end of the handle is used to connect with the tool handle, and is connected with the machine tool spindle through the tool handle; The knife body is provided with a plurality of ceramic cutting edges along the circumferential direction, and the knife body is also provided with a calibration ring and a diameter adjustment device; The calibration ring is annular and is sleeved on the outside of one end of the cutter body close to the handle and is interference fit with the end of the cutter body; The diameter adjustment device includes an adjustment mandrel and a cone ring structure arranged in the middle of the tool body, and an adjustment groove is axially arranged in the middle of the tool body, the adjustment groove includes a threaded section close to the shank and a bevel section close to the ceramic cutting edge, and the diameter of the bevel section gradually decreases from the head to the tail of the tool body; the outside of the cone ring structure is a bevel structure matching the bevel section of the adjustment groove, and the inside of the cone ring structure is provided with an axial through hole and the axial through hole is provided with an internal thread; the adjustment mandrel is an external thread structure, including a first-level external thread and a second-level external thread, wherein the first-level external thread matches the internal thread of the cone ring structure, and the second-level external thread matches the thread section of the adjustment groove; an adjustment hole is arranged in the middle of the top surface of the adjustment mandrel.

[0009] As a further improvement of the present invention, a pointer is provided on the top surface of the adjusting mandrel, and a plurality of scales are provided on the top surface of the cone ring structure along the circumferential direction.

[0010] As a further improvement of the present invention, the inner diameter of the calibration ring is tightly connected to the cutter body through an interference fit, and the tolerance of its outer diameter is controlled within the range of ±0.005~±0.01mm.

[0011] As a further improvement of the present invention, a cooling channel is provided in the middle of the shank along its axial direction, and the cooling channel extends from the inside of the shank to the ceramic cutting edge; Each ceramic cutting edge is provided with an inner cooling hole, the inner cooling hole is directed toward the ceramic cutting edge, and each inner cooling hole is connected with a cooling channel of the shank to deliver the coolant to the corresponding ceramic cutting edge.

[0012] As a further improvement of the present invention, the angle θ between the inner cooling hole and the ceramic cutting edge is 30°~60°.

[0013] As a further improvement of the present invention, the ceramic cutting edge is connected to the cutter body by welding.

[0014] According to another aspect of the present invention, a process for machining a bearing hole of a new energy motor housing is provided, using the ceramic reamer for machining the bearing hole of the new energy motor housing, comprising the following steps: Use the rough machining tool to perform rough machining of the bearing hole. Move the rough machining tool quickly to the initial position above the end face of the bearing hole, keep a safe height of at least 3mm, and then perform machining at a speed of 600~900 rpm and a feed speed of 300~500mm / min until it is at least 0.5mm away from the bottom surface of the bearing hole; the single-side allowance of rough machining is 0.07~0.1mm; Install the handle of the ceramic reamer on the tool holder and place it on the tool setting instrument for measurement. Measure the length of the ceramic reamer. Then align the measuring focus of the tool setting instrument on the calibration ring and rotate it one circle to measure the tool runout value to ensure that the runout value of the ceramic reamer is above the standard. The ceramic reamer with the tool handle is clamped on the machine tool spindle. During processing, the coolant will enter the cooling channel of the handle through the tool handle from the pipeline in the center of the machine tool spindle, and then spray out from the orifice of the inner coolant hole of the ceramic reamer. Use a ceramic reamer to finish the bearing hole; quickly move the ceramic reamer to the initial position above the end face of the bearing hole, maintain a safe height of at least 3mm, and then process at a speed of 600-900 rpm and a feed speed of 400-600mm / min until it is at least 0.5mm away from the bottom surface of the bearing hole; When the diameter of the ceramic reamer becomes smaller, the reduction in the bearing hole is measured according to the diameter of the processed bearing hole, and the corresponding scale of the mandrel rotation is controlled and adjusted.

[0015] In general, the above technical solution conceived by the present invention has the following beneficial effects compared with the prior art: (1) The ceramic reamer for machining the bearing hole of a new energy motor housing of the present invention can, through a diameter adjustment device, accurately control the diameter adjustment of the tool according to the required adjustment amount when the diameter of the ceramic reamer is reduced and no longer meets the machining requirements of the bearing hole of the workpiece, and can calibrate the ceramic reamer before using it for machining through a calibration ring on the tool body to ensure that the runout value of the ceramic reamer is below the standard. The present invention adopts a ceramic cutting edge with a calibration function and a diameter adjustment function, which can further improve the machining life of the tool and ensure the machining accuracy of the bearing hole.

[0016] (2) The ceramic reamer for machining the bearing hole of the new energy motor housing of the present invention can improve the machining efficiency: the high hardness and wear resistance of the ceramic reamer enable it to be machined at a higher cutting speed, thereby improving the machining efficiency; and can improve the machining quality: since the cutting edge of the ceramic tool is sharp, the surface roughness of the machined workpiece is low and the dimensional accuracy is high; at the same time, it can extend the tool life: compared with traditional carbide tools, the ceramic reamer has a longer life, reduces the frequency of tool replacement, and reduces the machining cost.

[0017] (3) The processing technology of the bearing hole of the new energy motor housing of the present invention first performs rough processing to leave a small amount of processing allowance for the ceramic reamer, and then processes the workpiece with the ceramic reamer. The surface roughness of the workpiece after processing is low and the dimensional accuracy is high. It can reduce the cost investment of the tool, improve the processing efficiency, greatly improve the processing quality, and reduce the processing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of a ceramic reamer according to an embodiment of the present invention; Figure 2 A schematic diagram of the angle setting of the cooling hole in the ceramic reamer according to an embodiment of the present invention; Figure 3 It is a schematic diagram of the separation structure of the diameter adjustment device of the ceramic reamer according to an embodiment of the present invention; Figure 4 It is a schematic diagram of the installation structure of the diameter adjustment device of the ceramic reamer according to an embodiment of the present invention; Figure 5 It is a schematic plan view of the structure of a diameter adjustment device for a ceramic reamer according to an embodiment of the present invention; Figure 6 Schematic diagram of the working state of the ceramic reamer according to an embodiment of the present invention.

[0019] In all the drawings, the same figure marks represent the same technical features, specifically: 1. Ceramic cutting edge; 2. Calibration ring; 3. Shank; 4. Internal coolant hole; 5. Adjustment groove; 6. Adjustment mandrel; 7. Conical ring structure; 8. Tool handle; 9. Machine tool spindle; 10. Bearing hole. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0021] In the description of the present invention, it is to 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”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, 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 limiting the present invention.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0025] As a preferred embodiment of the present invention, the present invention provides a ceramic reamer for machining the bearing hole of a new energy motor housing, comprising a shank 3 and a cutter body arranged at one end thereof, the cutter body being provided with a plurality of ceramic cutting edges 1 along the circumferential direction, the diameter of which matches the diameter of the bearing hole 10, and the cutter body being provided with a calibration ring 2 and a diameter adjustment device. The other end of the shank 3 is used to connect with the cutter handle 8, and is connected with the machine tool spindle 9 through the cutter handle 8.

[0026] Specifically, the calibration ring 2 is annular and is sleeved on the outside of the end of the cutter body near the handle 2. It has an interference fit with the end of the cutter body and is used to detect the runout of the cutter when the cutter is installed. During the assembly process of the calibration ring 2, the calibration ring 2 is heated to expand its inner diameter, and then quickly sleeved on the cutter body. After cooling, a tight interference fit is formed. The inner diameter of the calibration ring 2 is tightly connected to the cutter body through an interference fit, and the tolerance of its outer diameter is controlled within the range of ±0.005~±0.01mm to ensure good coaxiality.

[0027] Furthermore, if Figure 3 As shown, the diameter adjustment device includes an adjustment mandrel 6 and a cone ring structure 7 arranged in the middle of the cutter body, and an adjustment groove 5 communicating with the top of the cutter body is axially arranged in the middle of the cutter body, the adjustment groove 5 includes a threaded section near the shank 3 and a bevel section near the ceramic cutting edge 1, the outside of the cone ring structure 7 is a bevel structure matching the bevel section of the adjustment groove 5, the inside of the cone ring structure 7 is provided with an axial through hole and an internal thread on the axial through hole; the adjustment mandrel 6 is an external thread structure, including a first-stage external thread and a second-stage external thread, wherein the first-stage external thread matches the internal thread of the cone ring structure 7, and the second-stage external thread matches the thread section of the adjustment groove 5. An adjustment hole (such as an internal hexagonal structure) is arranged in the middle of the top surface of the adjustment mandrel 6.

[0028] The cone ring structure 7 is embedded in the inclined surface section of the adjustment groove 5, and the adjustment mandrel 6 passes through the axial through hole of the cone ring structure 7. At the same time, the first-level external thread of the cone ring structure 7 is matched and connected with the internal thread of the cone ring structure 7, and the second-level external thread is matched and connected with the thread section of the adjustment groove 5. When the adjustment hole of the adjustment mandrel 6 is rotated, the adjustment mandrel 6 moves axially under the action of the thread, thereby driving the cone ring structure 7 to move axially. Since the diameter of the inclined surface section of the adjustment groove 5 gradually decreases from the head of the tool body (the end close to the ceramic cutting edge 1) to the tail (the end close to the handle 3), the axial movement of the cone ring structure 7 will cause the ceramic cutting edge 1 of the head of the tool body to expand radially outward or contract radially inward, thereby realizing the adjustment of the tool diameter.

[0029] Preferably, if Figure 5 As shown, a pointer is provided on the top surface of the adjusting mandrel 6, and a plurality of scales are provided along the circumferential direction on the top surface of the cone ring structure 7. Through the cooperation of the pointer and the scales, the adjusting mandrel 6 can be controlled to rotate clockwise or counterclockwise to the required adjustment amount, and the diameter adjustment of the tool can be accurately controlled according to the required adjustment amount, and the adjustment accuracy is high.

[0030] Furthermore, a cooling channel is provided in the middle of the shank 3 along its axial direction, and the cooling channel extends from the inside of the shank 3 to the ceramic cutting edge 1 for conveying coolant. Furthermore, each ceramic cutting edge 1 is provided with an inner cooling hole 4, the direction of the inner cooling hole 4 is aligned with the ceramic cutting edge 1, and each inner cooling hole 4 is connected to the cooling channel of the shank 3 to convey coolant to the corresponding ceramic cutting edge 1. In the embodiment of the present invention, there are a total of 10 ceramic cutting edges 1, and 10 inner cooling holes 4 are provided accordingly.

[0031] Preferably, if Figure 2 As shown, the angle θ between the inner coolant hole 4 and the ceramic cutting edge 1 is 30°~60°. By setting the inner coolant hole and setting its angle, the coolant can simultaneously cool the ceramic cutting edge 1 and effectively flush the chips. When the coolant is sprayed onto the ceramic cutting edge 1, it can push the chips away from the cutting area and discharge them smoothly, which can not only improve the quality of the machined surface, but also prevent the chips from accumulating in the cutting area and affecting the machining accuracy.

[0032] In a preferred embodiment, the cutting edge of the ceramic cutting blade 1 is a straight blade. The straight blade reamer has a relatively stable axial force during the reaming process and is suitable for reaming straight holes with high precision requirements. The diameter tolerance of the ceramic cutting blade 1 is controlled between ±0.005-±0.01mm, and the dimensional accuracy is high to ensure the accuracy of the reamed hole diameter.

[0033] In a preferred embodiment, the ceramic cutting edge 1 is connected to the cutter body by welding, and the welding method is to connect the ceramic cutting edge 1 to the cutter body by high-temperature welding technology. In the welding process, active metal brazing technology is adopted, and brazing materials containing active elements such as titanium and zirconium are used to form a firm connection between the ceramic and the metal cutter body at high temperature, so as to ensure the connection strength and precision between the ceramic cutting edge and the cutter body.

[0034] The present invention also provides a processing technology for a bearing hole of a new energy motor housing using the ceramic reamer implemented by the present invention, comprising the following steps: (1) Use a rough machining tool (such as a double-edged boring tool) to perform rough machining of the bearing hole. Move the rough machining tool quickly to the initial position above the end face of the bearing hole, maintain a safety height of at least 3 mm, and then perform machining at a speed of 600-900 rpm and a feed speed of 300-500 mm / min until it is at least 0.5 mm away from the bottom surface of the bearing hole; the single-side allowance for rough machining is 0.07-0.1 mm; Before machining the ceramic reamer, it is necessary to use a roughing tool to roughen it, leaving a single-side machining allowance of 0.07~0.1mm for the ceramic reamer finishing, to ensure the machining accuracy and quality of the ceramic reamer and reduce tool wear. Then, the machining is performed at a speed of 600~900 rpm and a feed speed of 300~500mm / min until it is at least 0.5mm away from the bottom surface of the bearing hole to prevent the blade from touching the bottom and damaging the tool, thus reducing the tool life.

[0035] Preferably, when the rough machining tool exits the bearing hole of the product, the rough machining tool needs to be reversed (the rotation speed is preferably 5000 rpm) to prevent the long chips from being entangled in the tool, causing damage to the blade and reducing the tool life.

[0036] Preferably, after the rough machining, the bottom of the bearing hole is machined with a T-shaped tool, and a radial backing groove of the bearing hole is machined.

[0037] (2) Install the shank 3 of the ceramic reamer on the tool handle 8 and place it on the tool setting instrument for measurement. Measure the length of the ceramic reamer. Then align the measurement focus of the tool setting instrument on the calibration ring 2 and rotate it one circle to measure the tool runout value to ensure that the runout value of the ceramic reamer is above the standard (that is, the runout value must be below the required minimum value). Before using the ceramic reamer for finishing, calibrate it with the calibration ring 2. Install the handle 3 on the tool handle 8 and tighten it with screws. First, measure the length of the ceramic reamer on the tool setting instrument, then focus the measurement of the tool setting instrument on the calibration ring 2, rotate it once to measure the tool runout value, which needs to be less than 0.01; if the runout exceeds 0.01, the ceramic reamer needs to be slightly rotated and fine-tuned in the tool handle again until the tool runout value is less than 0.01.

[0038] (3) The ceramic reamer with the tool handle 8 is clamped on the machine tool spindle 9. During processing, the coolant will enter the cooling channel of the handle 3 from the pipeline in the center of the machine tool spindle 9 through the tool handle 8, and then be sprayed out from the orifice of the internal coolant hole 4 of the ceramic reamer.

[0039] (4) Finishing of the bearing hole using a ceramic reamer; Move the ceramic reamer quickly to the initial position above the end face of the bearing hole, keep the safe height at least 3mm, and then process at a speed of 600-900 rpm and a feed speed of 400-600mm / min until it is at least 0.5mm away from the bottom surface of the bearing hole; During fine machining, the cutting depth is 0.07~0.1mm on one side, and the machining is continued until there is at least 0.5mm away from the bottom surface of the bearing hole to prevent the blade from touching the bottom and damaging the tool. Then the product is withdrawn at the same speed to complete the fine machining.

[0040] (5) When the diameter of the ceramic reamer becomes smaller according to the diameter of the processed bearing hole, the reduction amount of the bearing hole is measured, and the corresponding scale of the rotation of the mandrel 6 is controlled and adjusted; In a specific embodiment, a ceramic reamer can process about 2,000 products at a time. Due to the wear of the ceramic reamer, its diameter will gradually decrease. For example, when processing about 1,000 pieces, the aperture size of the motor housing bearing hole will gradually change from φ80.016mm to φ80.003mm. At this time, the data will be reflected in the three-coordinate measurement report. When the data is φ80.003mm or below, it needs to be adjusted. After the adjustment, the product will be sent for three-coordinate measurement again.

[0041] Taking this embodiment and the accompanying drawings as an example, the specific adjustment steps are as follows: remove the shank 8 and the ceramic reamer from the machine tool spindle 9, align the adjusting hole of the adjusting mandrel 6 with the hexagonal wrench, and turn it clockwise (i.e. the direction of the + sign in the figure) by 2 grids, one grid is 0.005mm, that is, the total adjustment is 0.01mm. After completion, reinstall the ceramic reamer on the machine tool spindle 9, and the ceramic reamer can process another 1,000 pieces, that is, the single life can reach 2,000 pieces. Compared with the single-edged boring tool in the prior art, not only the processing size is stable, but also the tool life is greatly improved.

[0042] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A ceramic reamer for machining bearing holes of new energy motor housings, characterized in that: It comprises a handle and a knife body arranged at one end of the handle; The other end of the handle is used to connect with the tool handle, and is connected with the machine tool spindle through the tool handle; The knife body is provided with a plurality of ceramic cutting edges along the circumferential direction, and the knife body is also provided with a calibration ring and a diameter adjustment device; The calibration ring is annular and is sleeved on the outside of one end of the cutter body close to the handle and is interference fit with the end of the cutter body; The diameter adjustment device includes an adjustment mandrel and a cone ring structure arranged in the middle of the tool body, and an adjustment groove is axially arranged in the middle of the tool body, the adjustment groove includes a threaded section close to the shank and a bevel section close to the ceramic cutting edge, and the diameter of the bevel section gradually decreases from the head to the tail of the tool body; the outside of the cone ring structure is a bevel structure matching the bevel section of the adjustment groove, and the inside of the cone ring structure is provided with an axial through hole and the axial through hole is provided with an internal thread; the adjustment mandrel is an external thread structure, including a first-level external thread and a second-level external thread, wherein the first-level external thread matches the internal thread of the cone ring structure, and the second-level external thread matches the thread section of the adjustment groove; an adjustment hole is arranged in the middle of the top surface of the adjustment mandrel.

2. The ceramic reamer for machining the bearing hole of the new energy motor housing according to claim 1 is characterized in that: A pointer is arranged on the top surface of the adjusting mandrel, and a plurality of scales are arranged on the top surface of the cone ring structure along the circumferential direction.

3. The ceramic reamer for machining the bearing hole of the new energy motor housing according to claim 1 is characterized in that: The inner diameter of the calibration ring is tightly connected to the cutter body through interference fit, and the tolerance of its outer diameter is controlled within the range of ±0.005~±0.01mm.

4. The ceramic reamer for machining the bearing hole of a new energy motor housing according to any one of claims 1 to 3, characterized in that: A cooling channel is provided in the middle of the shank along its axial direction, and the cooling channel extends from the inside of the shank to the ceramic cutting edge; Each ceramic cutting edge is provided with an inner cooling hole, the inner cooling hole is directed toward the ceramic cutting edge, and each inner cooling hole is connected with a cooling channel of the shank to deliver the coolant to the corresponding ceramic cutting edge.

5. The ceramic reamer for machining the bearing hole of the new energy motor housing according to claim 4 is characterized in that: The angle θ between the inner cooling hole and the ceramic cutting edge is 30° to 60°.

6. The ceramic reamer for machining the bearing hole of a new energy motor housing according to any one of claims 1 to 3 or 5, characterized in that: The ceramic cutting edge is connected to the cutter body by welding.

7. A processing technology for a bearing hole of a new energy motor housing, using a ceramic reamer for processing a bearing hole of a new energy motor housing according to any one of claims 1 to 6, characterized in that: The steps include: Use the rough machining tool to perform rough machining of the bearing hole. Move the rough machining tool quickly to the initial position above the end face of the bearing hole, keep a safe height of at least 3mm, and then perform machining at a speed of 600~900 rpm and a feed speed of 300~500mm / min until it is at least 0.5mm away from the bottom surface of the bearing hole; the single-side allowance of rough machining is 0.07~0.1mm; Install the handle of the ceramic reamer on the tool holder and place it on the tool setting instrument for measurement. Measure the length of the ceramic reamer. Then align the measuring focus of the tool setting instrument on the calibration ring and rotate it one circle to measure the tool runout value to ensure that the runout value of the ceramic reamer is above the standard. The ceramic reamer with the tool handle is clamped on the machine tool spindle. During processing, the coolant will enter the cooling channel of the handle through the tool handle from the pipeline in the center of the machine tool spindle, and then spray out from the orifice of the inner coolant hole of the ceramic reamer. Use a ceramic reamer to finish the bearing hole; quickly move the ceramic reamer to the initial position above the end face of the bearing hole, maintain a safe height of at least 3mm, and then process at a speed of 600-900 rpm and a feed speed of 400-600mm / min until it is at least 0.5mm away from the bottom surface of the bearing hole; When the diameter of the ceramic reamer becomes smaller, the reduction in the bearing hole is measured according to the diameter of the processed bearing hole, and the corresponding scale of the mandrel rotation is controlled and adjusted.

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