Rib-shaped electric spindle cooling water jacket

Abstract

A rib-shaped electric spindle cooling water jacket belongs to the technical field of ultra-precision machining and comprises a novel electric spindle cooling water jacket composed of three water jackets, and each water jacket is provided with a water inlet, two water outlets, three main runners and twelve branch runners. Compared with a traditional water jacket, the average temperature of the structure is reduced by 5 DEG C, the temperature of the water jacket part is reduced by 5 DEG C, and the temperature of the main shaft part is reduced by 2 DEG C. The cooling efficiency of the cooling water jacket is improved, so that the heat dissipation effect of the main heat generation part of the motorized spindle is improved, the thermal error of the motorized spindle is reduced, and the machining precision of the motorized spindle is obviously improved.

Description

Technical Field

[0001] The invention belongs to the technical field of ultra-precision machining, and in particular relates to a rib-shaped electric spindle cooling water jacket. Background Art

[0002] With the rapid development of mechanical processing and manufacturing industry, the development level of ultra-precision machining technology often represents the development level of the country. Ultra-precision machining is an indispensable key processing method in the development of cutting-edge technology. Both military industry and civilian industry need this advanced processing technology. In addition, the development of ultra-precision machining technology has also promoted the development of machinery, hydraulics, electronics, semiconductors, optics, sensors and measurement technology and materials science. In a sense, ultra-precision machining has the important mission of supporting the latest scientific and technological progress, and it is also an important symbol of a country's scientific and technological level. There are many factors that affect the accuracy of ultra-precision machining, and the error caused by the electric spindle accounts for about 40-70% of the total error. Therefore, it is very important to conduct in-depth research on the electric spindle. However, the traditional water jacket has the disadvantages of large flow resistance, uneven cooling temperature, and low heat exchange capacity. In order to overcome the above problems, a ribbed cooling water jacket is designed, which is particularly important for reducing the thermal error of high-speed electric spindles and improving machining accuracy. Summary of the invention

[0003] In order to reduce the influence of heat generation on machining accuracy of a high-speed electric spindle during operation, the present invention provides a rib-shaped electric spindle cooling water jacket.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] The invention discloses a rib-shaped electric spindle cooling water jacket, wherein the novel cooling water jacket is composed of three water jackets, each of which has a water inlet, two water outlets, three main flow channels and 12 branch flow channels.

[0006] Furthermore, cooling water flows into the ribbed cooling water jacket from the water inlet at a flow rate of 1m / s, flows through three main flow channels, 12 branch flow channels, and flows out from two water outlets, taking away the heat generated by the electric spindle during operation, thereby reducing the temperature rise of the electric spindle and improving its machining accuracy.

[0007] Furthermore, in order to verify the feasibility of the rib-shaped electric spindle cooling water jacket proposed in the present invention in reducing the heat generated by the electric spindle, a simulation analysis method is used for verification.

[0008] Furthermore, the contour map is copied into a sketch in SOLIDWORKS software. The thermal-fluid-solid coupling simulation results of the electric spindle using the new water jacket model and the traditional spiral water jacket electric spindle are compared.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] The present invention proposes a rib-shaped electric spindle cooling water jacket. The results show that the average temperature of the electric spindle using the newly designed cooling water jacket is reduced by 5°C, the temperature of the water jacket is reduced by 5°C, and the temperature of the spindle is reduced by 2°C. The results show that the rib-shaped electric spindle cooling water jacket proposed by the present invention has higher heat dissipation efficiency and can be better used in the electric spindle to reduce the thermal error of the electric spindle. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Schematic diagram of ribbed cooling water jacket Figure 1

[0012] Figure 2 Schematic diagram of ribbed cooling water jacket Figure 2

[0013] Figure 3 Schematic diagram of ribbed cooling water jacket Figure 3

[0014] Figure 4 This is the model of the electric spindle using a ribbed cooling water jacket.

[0015] Figure 5 a is the overall temperature field of the electric spindle using a rib-shaped cooling water jacket, and b is the overall temperature field of the electric spindle using a traditional spiral water jacket.

[0016] Figure 6 a is the temperature field of the rib-shaped cooling water jacket, and b is the temperature field of the traditional spiral water jacket.

[0017] Figure 7 a is the spindle temperature field after optimization, b is the spindle temperature field before optimization.

[0018] In the figure: 1 is a ribbed cooling water jacket 1; 2 is a ribbed cooling water jacket 2; 3 is a ribbed cooling water jacket 3; 11 is a water inlet; 12 is a main flow channel; 13 is a branch flow channel; 14 is a main flow channel; 15 is a water outlet; 16 is a water outlet; 17 is a branch flow channel; 18 is a main flow channel; 21 is a water inlet; 22 is a main flow channel; 23 is a branch flow channel; 24 is a main flow channel; 25 is a water outlet; 26 is a water outlet; 27 is a branch flow channel; 28 is a main flow channel; 31 is a water inlet; 32 is a main flow channel; 33 is a branch flow channel; 34 is a main flow channel; 335 is a water outlet; 36 is a water outlet; 37 is a branch flow channel; 38 is a main flow channel. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] The purpose of the present invention is to provide a rib-shaped electric spindle cooling water jacket that can reduce the influence of heat generation on the processing accuracy of the high-speed electric spindle during operation. In order to make the above-mentioned purpose and features of the present invention clearer and easier to understand, the following is a detailed description in conjunction with the accompanying drawings.

[0021] Rib-shaped cooling water jacket 1, 2, 3, water inlets 11, 21, 1, main flow channels 12, 13, 14, 22, 23, 24, 32, 33, 34, branch flow channels 17, 18, 27, 28, 37, 38, and water outlets 15, 16, 25, 26, 35, 36. The rib-shaped cooling water jacket is fixed between the stator and the housing of the electric spindle.

[0022] The cooling water flows into the ribbed cooling water jacket from the water inlet at a flow rate of 1m / s, flows through three main flow channels, 12 branch flow channels, and flows out from two water outlets, taking away the heat generated by the electric spindle during operation, thereby reducing the temperature rise of the electric spindle and improving its processing accuracy.

[0023] In order to verify the feasibility of the rib-shaped electric spindle cooling water jacket proposed in the present invention in reducing the heat generation of the electric spindle, the rib-shaped cooling water jacket is replaced with the old spiral water jacket to form an assembly such as Figure 4 The new motorized spindle model was imported into COMSOL Multiphysics for thermal-fluid-solid coupling simulation analysis and compared with the traditional spiral water jacket model.

[0024] The electric spindle simulation model includes a solid and fluid heat transfer module, a laminar flow module, and a non-isothermal flow module coupled with the two modules. The boundary condition setting of the solid and fluid heat transfer module is: the micro heat dissipation structure in the calculation domain is set as solid, and the cooling water is set as fluid. The boundary condition setting of the laminar flow module is: the cooling water inlet velocity is 1m / s. In order to be fair, the two water jacket models use the same boundary conditions, and the specific boundary conditions are shown in Table 1.

[0025] Table 1

[0026] Stator heat generation <![CDATA[608753w / m 3 ]]> Rotor heat generation <![CDATA[687654w / m 3 ]]> Heat generation at front bearing <![CDATA[3176976w / m 3 <!-- 2 -->]]> Heat generation at rear bearing <![CDATA[3728081w / m 3 ]]> Heat flux between stator and rotor <![CDATA[201.5w / (m 2 ·k)]]> Heat flux between stator water jacket <![CDATA[317w / (m 2 ·k)]]> Front bearing heat flux <![CDATA[302w / (m 2 ·k)]]> Rear bearing heat flux <![CDATA[191w / (m 2 ·k)]]> Heat flux between shell and air <![CDATA[9.7w / (m 2 ·k)]]> Coolant flow rate 1m / s

[0027] Mesh division: The mesh division is extremely fine, which is more accurate for the calculation results. The physical field is used to control the mesh. Simulation result analysis: The results are as follows Figure 5As shown in the figure, the overall maximum temperature of the electric spindle before the improvement was 65°C. After the rib-shaped cooling water jacket was used, the temperature was reduced by 5°C to 60°C. The temperature of the water jacket was reduced from 36°C to 31°C. Finally, the spindle temperature was reduced by 2°C. From the simulation results, it can be seen that compared with the traditional spiral water jacket, the present invention greatly reduces the spindle, cooling water and the overall temperature of the electric spindle, thereby reducing the impact of thermal errors on the electric spindle during operation, and effectively suppressing the thermal errors of the electric spindle.

[0028] The specific working process of the present invention is as follows:

[0029] The present invention is composed of cooling water jacket rib 1, cooling water jacket rib 2 and cooling water jacket rib 3. Since the rib-shaped cooling water jackets 1, 2 and 3 have the same structure, the specific working process is mainly described with the rib-shaped cooling water jacket 1. Cooling water flows into the cooling water jacket from the water inlet 11, flows through the main flow channel 12, the main flow channel 14, the main flow channel 18 and 12 branch flow channels such as branch flow channels 13 and 17, and finally flows out from the water outlet 16 on the main flow channel 18 and the water outlet 15 on the main flow channel 14, taking out the heat generated by the electric spindle when it is working. The cooling water flow rate is 1m / s, the initial cooling water temperature is 25°C, and the outlet pressure is 0Pa. The angle of the branch flow channel relative to the main flow channel is 70°, the width of the main flow channel is 30mm, and the width of the branch flow channel is 10.33mm.

[0030] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. The present invention discloses a rib-shaped electric spindle cooling water jacket, characterized in that: include: There are three rib-shaped water jackets, each of which has one water inlet, two water outlets, three main flow channels and 12 branch flow channels. The cooling water jacket is installed between the stator and the housing of the electric spindle.

2. According to claim 1, cooling water flows into the ribbed cooling water jacket from the water inlet at a flow rate of 1m / s, flows through three main flow channels, 12 branch flow channels, and flows out from two water outlets, taking away the heat generated by the electric spindle during operation. This reduces the temperature rise of the electric spindle and improves its machining accuracy.

3. According to claim 1, the three rib-shaped water jackets are evenly arranged to form an integral cooling water jacket.

4. According to claim 2, the angle between the branch channel and the main channel is 70°.

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