Processing technology of water-cooled motor shell end face netting

Abstract

The application discloses a kind of water-cooled motor shell end surface net texture's processing technology, belong to water-cooled motor processing technical field.Net texture processing technology includes blank early-stage processing, preset effect parameter and processing parameter, determine single processing duration, trial processing, detect processing quality and correct process parameter etc.Step.The process of the present application processes net texture by presetting processing effect, setting process parameters of machining center according to formula, and pre-processing verifies the stability of preset parameters, revises processing parameters by adjusting processing coefficient, so as to realize the processing of large pattern density and shallow pattern gully, meet the requirement of new energy water-cooled motor shell on end surface roughness, avoid the risk of water leakage.In addition, the present application sets the tool single processing time, completes the net texture processing of the whole end surface of water-cooled motor shell in the form of segmented processing, ensures that single processing will not cause shell deformation, improves processing precision, and avoids the use of coolant.

Description

Technical Field

[0001] The invention belongs to the field of water-cooled motor processing technology, and in particular, a processing technology for the textured surface of the housing end face of a water-cooled motor. Background Technology

[0002] Water-cooled motors are special motors with internal circulation water cooling and variable frequency speed regulation. Currently, the sealing method for the end face of new energy water-cooled motor housings is to use end caps with glue. The mating surface of the motor housing has a planar structure, and its glue storage capacity is limited. Most of the sealant is squeezed out under pressure. When too much is squeezed out, it will cause the mating surface to have no glue, which will lead to water leakage from the water-cooled motor housing.

[0003] In terms of existing technology, machining a textured structure on the end face of a water-cooled motor housing increases the surface roughness, indirectly increasing the adhesion area of ​​the sealant and achieving effective sealing. Current requirements for the surface roughness of new energy water-cooled motor housings are generally within the RZ10-20 standard. This means that a high density of patterns and shallow grooves are necessary to provide a good coating environment for the sealant. Existing textured machining processes rely on empirical values ​​and repeated machining experiments to determine the tool speed and feed rate, resulting in a surface roughness of RZ40-64 for the textured structure. Efficiently and accurately adjusting these machining parameters is a key challenge in the textured machining process for water-cooled motor housings. Furthermore, during the textured machining of large water-cooled motor housings, the accumulation of frictional heat between the tool and the workpiece alters the surface structure of the workpiece, significantly impacting the texture quality. Currently, coolant is used to address the thermal deformation of the workpiece, but the debris generated during textured machining is too fine, hindering high-quality coolant recovery. Summary of the Invention

[0004] Purpose of the invention: To provide a processing technology for the textured surface of the housing of a water-cooled motor, so as to solve the above-mentioned problems existing in the prior art.

[0005] Technical solution: A processing method for creating a textured surface on the end face of a water-cooled motor housing, comprising the following steps:

[0006] Step 1: Preparation of the housing blank; rough machining of the two end faces of the water-cooled motor housing blank;

[0007] Step 2: Set the expected effect parameters; and calculate the tool feed rate based on the expected effect parameters and the tool speed of the preset machining parameters. The calculation formula is as follows: The machining parameters are set, where f represents the tool feed rate, λ represents the machining coefficient, n represents the tool rotation speed, and R... Z The value represents the expected roughness, ρ represents the density of the webbing segments, Z represents the number of tool teeth, and R represents the tool diameter.

[0008] Step 3: Setting the single processing time; Using the preset tool rotation speed n and calculated tool feed rate f from Step 2, the maximum heat accumulation Q affecting the end face processing is obtained based on the material characteristics of the machine housing blank. max Through formula For the maximum single processing time t max The calculation is performed, and the allowable processing time t0 is selected as the single processing time for texture machining, where k represents the heat accumulation coefficient, Q represents the amount of heat energy accumulated by the friction between the motor housing and the cutting tool, and t0 = (0.8~0.95)t max ;

[0009] Step 4: Trial machining; Assemble the roughened housing blank onto the housing fixture, input the machining parameters obtained in Step 2 and Step 3 into the machining center, plan multiple machining paths according to the dimensions of the motor housing, and perform a trial machining of the end face of the housing blank using the machining center.

[0010] Step 5: Inspect the machining quality and determine the reliability of the parameters; remove the machine housing blank after step 4 and check the surface roughness R of the machine housing blank end face. Z Whether the density ρ of the mesh line segments is close to the preset value to meet the requirements of glue sealing;

[0011] Step 6: Adjust the processing coefficient and correct the processing parameters; if the machine shell blank meets the standard and the parameters are reliable, then mass production can begin; if it does not meet the standard and the parameters are unreliable, then adjust the processing coefficient λ and repeat steps 2 to 5 until the textured processing effect meets the standard.

[0012] Furthermore, the processing coefficient λ is greater than 1.25 × 10⁻⁶. -3 Less than 1.40×10 -3 When adjusting the processing coefficient λ in step 6, the preferred value is λ = 1.3 × 10⁻⁶. -3 Then, the appropriate processing coefficient λ is quickly found using the dichotomy method.

[0013] Furthermore, the housing fixture includes a bottom tray, a central column is mounted on the bottom tray, a pressure plate is fitted on the central column, fasteners are threaded onto the central column, and an expansion device is provided around the central column. The expansion device is mounted on the bottom tray and is used for horizontal positioning of the housing blank.

[0014] Furthermore, a limiting boss is provided on the bottom tray, and a chamfer is provided on the limiting boss. The maximum diameter of the limiting boss is 1mm smaller than the inner diameter of the housing blank, and the height of the limiting boss is less than the minimum distance from the stop to the end face.

[0015] Furthermore, step 4, assembling the roughened housing blank onto the housing fixture, includes the following steps:

[0016] Step 41: Clean the work platform of the machining center and fix the bottom tray to the machining platform;

[0017] Step 42: Fit the housing blank onto the limiting boss on the bottom tray;

[0018] Step 43: Activate the tire expansion device to fix the horizontal position of the machine casing blank;

[0019] Step 44: Place the pressure plate on the central column and fix the pressure plate to the stop on the inner wall of the housing blank with fasteners.

[0020] Furthermore, the tire expansion device is a pneumatic axle hole expansion device.

[0021] Furthermore, step 1 also includes rough machining the two end faces of the housing blank, and then rough machining the inner hole, locating pin hole and end cover mounting hole on the housing blank.

[0022] Furthermore, after the shell blank has completed the mesh pattern processing on one end face, the shell blank and the outer casing fixture are cleaned, and the shell blank is re-clamped to perform mesh pattern processing on the other end face.

[0023] Beneficial effects: The process of processing mesh patterns in this invention uses a preset processing effect method. Based on the formula, the effect parameters and process parameters of the machining center are set, and the stability of the preset parameters is verified by pre-processing. The processing parameters are revised by adjusting the processing coefficient, thereby quickly matching the optimal processing parameters, making the ratio of tool speed and tool feed rate more accurate, and thus achieving processing with high pattern density and shallow pattern grooves, meeting the requirements of new energy water-cooled motor housing for end face roughness.

[0024] In addition, the present invention sets the single processing time of the tool and completes the textured processing of the entire end face of the water-cooled motor housing in a segmented processing manner, ensuring that the housing deformation that would affect the processing effect will not be caused by a single processing, improving the processing accuracy, and also avoiding the use of coolant. Attached Figure Description

[0025] Figure 1 This is a flowchart illustrating the invention process.

[0026] Figure 2 This is a schematic diagram of the structure in the invention where the outer casing clamp fixes the machine casing blank.

[0027] Figure 3 This is a schematic diagram of the processing path in the invention.

[0028] The attached diagram is labeled as follows: 1. Bottom tray; 11. Limiting boss; 12. Wiring hole; 2. Central column; 3. Expansion device; 4. Pressure plate; 5. Fastener; 6. Housing blank; 61. Stop. Detailed Implementation

[0029] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid obscuring the invention.

[0030] like Figure 1 As shown, a processing method for creating a textured surface on the end face of a water-cooled motor housing includes the following steps:

[0031] Step 1: Preparation of housing blank 6. Rough turn the two end faces of the water-cooled motor housing blank 6, and then rough turn the inner hole, locating pin hole and end cover mounting hole on the housing blank 6.

[0032] Step 2: Set the expected effect parameters, and calculate the tool feed rate based on the expected effect parameters and the tool speed of the preset machining parameters. The calculation formula is as follows: The machining parameters are set, where f represents the tool feed rate and λ represents the machining coefficient, which is greater than 1.25 × 10⁻⁶. -3 Less than 1.40×10 -3 , n represents the numerical value of the tool rotation speed, R Z The values ​​represent the expected surface roughness, ρ represents the density of the webbing segments, Z represents the number of tool teeth, and R represents the tool diameter. An example is given to illustrate the expected surface roughness R. Z The density ρ of the mesh line segments is 2.084 lines / mm (each 1mm contains 2.084 alternating longitudinal and transverse stripes). A specific embodiment is provided, with a selected tool diameter R of 20mm, a tool tooth number Z of 4, a preset tool speed n of 2000 r / min, and a selected machining coefficient λ of 1.30 × 10⁻⁶. -3 Substituting the above parameters into the formula, the tool feed rate f is calculated to be 998.08 mm / min.

[0033] Step 3: Setting the single processing time, using the preset tool rotation speed n and calculated tool feed rate f from Step 2, and based on the material characteristics of the machine housing blank 6, obtaining the maximum heat accumulation Q affecting the machined end face. max Through formula For the maximum single processing time t max The calculation is performed, and the allowable processing time t0 is selected as the single processing time for mesh processing, t0 = (0.8~0.95)t maxWhere k represents the heat accumulation coefficient (which is related to factors such as room temperature, the thermal expansion coefficient of the blank 6, the end face size of the blank 6, and the material of the cutting tool), and Q represents the amount of heat energy accumulated by the friction between the motor housing and the cutting tool during a single machining cycle; taking a 5.5KW 3500rpm 72VDC dual-axis water-cooled motor housing as an example, with the cutting tool material being cemented carbide, Q is approximately 900J, and k is 1.35×10 -5 The maximum processing time t for a single operation was calculated to be 8.1 seconds, and t0 was chosen to be 7 seconds.

[0034] Step 4: Trial machining. Assemble the roughened housing blank 6 onto the housing fixture. The specific steps are as follows:

[0035] Step 41: Clean the work platform of the machining center and fix the bottom tray 1 to the machining platform;

[0036] Step 42: Fit the housing blank 6 onto the limiting boss 11 of the bottom tray 1;

[0037] Step 43: Start the tire expansion device 3 to fix the horizontal position of the machine casing blank 6;

[0038] Step 44: Place the pressure plate 4 onto the central column 2 and fix the pressure plate 4 to the stop 61 on the inner wall of the housing blank 6 using fasteners 5.

[0039] Input the machining parameters obtained in steps 2 and 3 into the machining center, and plan multiple machining paths based on the motor housing dimensions (e.g., ...). Figure 3 As shown, the cutting tool sequentially processes along segmented paths a, b, c, and d, and the end face of the housing blank 6 is subjected to trial machining using a machining center to produce a textured finish. Figure 3 The processing path shown is segmented sequentially, which avoids heat accumulation caused by continuous processing, effectively mitigating the impact of thermal deformation of the housing blank 6 on processing accuracy. Moreover, the processing does not require the participation of coolant, so that the surface texture processing effect of the housing blank 6 meets the roughness required for the end face sealing of the new energy water-cooled motor housing.

[0040] Step 5: Inspect the machining quality and determine the reliability of the parameters; remove the machine housing blank 6 after processing in Step 4 and inspect the surface roughness R of the end face of the machine housing blank 6. Z Check whether the density ρ of the mesh line segments is close to the preset value to meet the requirements of glue sealing.

[0041] Step 6: Adjust the machining coefficient and correct the machining parameters. If the machine housing blank 6 meets the standards and the parameters are reliable, then mass production can begin. If it does not meet the standards and the parameters are unreliable, it may be affected by factors such as the accuracy of the machining center, the clamping effect, and the material properties of the machine housing blank 6. Adjust the machining coefficient λ and repeat steps 2 to 5 until the textured finish meets the standards. The bisection method is used when adjusting the machining coefficient λ.

[0042] like Figure 2 As shown, the outer casing fixture in step 4 includes a bottom tray 1, a central column 2 mounted on the bottom tray 1, a pressure plate 4 fitted on the central column 2, fasteners 5 threadedly connected to the central column 2, and an expansion device 3 provided around the central column 2. The expansion device 3 is mounted on the bottom tray 1 and is used for horizontal positioning of the casing blank 6.

[0043] The bottom tray 1 has a limiting boss 11 with a chamfer. The maximum diameter of the limiting boss 11 is 1mm smaller than the inner diameter of the housing blank 6, and the height of the limiting boss 11 is less than the minimum distance from the stop 61 to the end face. The limiting boss 11 facilitates the horizontal positioning of the two end faces of the housing blank 6 and is easy to use. The tire expansion device 3 is a pneumatic shaft hole expansion device. The air passage of the tire expansion device 3 passes through the wiring hole 12 and is connected to an external air source. The tire expansion device 3 can quickly complete the horizontal positioning of the housing blank 6.

[0044] Finally, after completing step 7, once the shell blank 6 has completed the mesh pattern processing on one end face, clean the shell blank 6 and the outer casing fixture, and re-clamp the shell blank 6 to perform mesh pattern processing on the other end face.

[0045] The preferred embodiments of the invention have been described in detail above with reference to the accompanying drawings. However, the invention is not limited to the specific details of the above embodiments. Within the scope of the inventive concept, various equivalent transformations can be made to the technical solutions of the invention, and all such equivalent transformations fall within the protection scope of the invention.

Claims

1. A processing technology for the textured surface of the housing end face of a water-cooled motor, characterized in that, Includes the following steps: Step 1: Preparation of the housing blank (6); rough machining of the two end faces of the water-cooled motor housing blank (6); Step 2: Set the expected effect parameters, and calculate the tool feed rate based on the expected effect parameters and the tool speed of the preset machining parameters; the calculation formula is as follows: Where f represents the tool feed rate, λ represents the machining coefficient, n represents the tool rotation speed, and R... Z The value represents the expected roughness, ρ represents the density of the webbing segments, Z represents the number of tool teeth, and R represents the tool diameter. Step 3: Setting the single processing time; Using the preset tool rotation speed n and calculated tool feed rate f in Step 2, the maximum heat accumulation Q affecting the end face processing is obtained based on the material characteristics of the machine housing blank (6). max Through formula For the maximum single processing time t max The calculation is performed, and the allowable processing time t0 is selected as the single processing time for texture machining, where k represents the heat accumulation coefficient, Q represents the amount of heat energy accumulated by the friction between the motor housing and the cutting tool, and t0 = (0.8~0.95)t max ; Step 4: Trial machining; Assemble the roughened housing blank (6) onto the housing fixture, input the machining parameters obtained in Step 2 and Step 3 into the machining center, plan multiple machining paths according to the size of the motor housing, and perform a mesh trial machining on the end face of the housing blank (6) through the machining center. Step 5: Inspect the machining quality and determine the reliability of the parameters; remove the machine housing blank (6) after processing in Step 4 and check the surface roughness R of the machine housing blank (6). Z Whether the density ρ of the mesh line segments is close to the preset value to meet the requirements of glue sealing; Step 6: Adjust the processing coefficient and correct the processing parameters; if the machine shell blank (6) meets the standard and the parameters are reliable, then mass production can begin; if it does not meet the standard and the parameters are unreliable, then adjust the processing coefficient λ and repeat steps 2 to 5 until the textured processing effect meets the standard.

2. The processing technology for the textured end face of a water-cooled motor housing according to claim 1, characterized in that: The processing coefficient λ is greater than 1.25 × 10 -3 Less than 1.40×10 -3 Step 6 uses the bisection method to adjust the processing coefficient λ.

3. The processing technology for the textured end face of a water-cooled motor housing according to claim 1, characterized in that: The outer casing clamp includes a bottom tray (1), a central column (2) is mounted on the bottom tray (1), a pressure plate (4) is fitted on the central column (2), a fastener (5) is threaded onto the central column (2), and an expansion device (3) is provided around the central column (2). The expansion device (3) is mounted on the bottom tray (1) and is used for the horizontal positioning of the casing blank (6).

4. The processing technology for the textured end face of a water-cooled motor housing according to claim 3, characterized in that: A limiting boss (11) is provided on the bottom tray (1). The limiting boss (11) has a chamfer. The maximum diameter of the limiting boss (11) is 1 mm smaller than the inner diameter of the housing blank (6). The height of the limiting boss (11) is less than the minimum distance from the stop (61) to the end face.

5. The processing technology for the textured end face of a water-cooled motor housing according to any one of claims 1-4, characterized in that: Step 4, which involves assembling the roughened housing blank (6) onto the housing fixture, includes the following steps: Step 41: Clean the work platform of the machining center and fix the bottom tray (1) to the machining platform; Step 42: Fit the housing blank (6) onto the limiting boss (11) of the bottom tray (1); Step 43: Start the tire expansion device (3) to fix the horizontal position of the machine housing blank (6); Step 44: Place the pressure plate (4) onto the central column (2) and fix the pressure plate (4) to the stop (61) on the inner wall of the housing blank (6) using fasteners (5).

6. The processing technology for the textured end face of a water-cooled motor housing according to claim 3, characterized in that: The tire expansion device (3) is a pneumatic shaft hole expansion device.

7. The processing technology for the textured end face of a water-cooled motor housing according to claim 1, characterized in that: Step 1 further includes rough machining the two end faces of the housing blank (6), and then rough machining the inner hole, the locating pin hole and the end cover mounting hole on the housing blank (6).

8. The processing technology for the textured end face of a water-cooled motor housing according to claim 1, characterized in that: It also includes step 7, after the housing blank (6) completes the mesh processing on one end face, the housing blank (6) and the housing fixture are cleaned, and the housing blank (6) is re-clamped and the mesh processing is performed on the other end face.

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