A method for processing a supercharger sealing ring groove

Abstract

The present invention relates to the technical field of sealing ring grooves, and in particular to a method for processing a sealing ring groove of a supercharger, comprising a clamping device and a controller, wherein the clamping device comprises a fixed base, a locking assembly is provided on the fixed base, a correction assembly is provided between the fixed base and the locking assembly, and a displacement detection assembly is provided on the fixed base; the correction assembly comprises a stepper motor fixedly mounted on the fixed base, a reduction gear set is connected to the output shaft of the stepper motor, and the reduction gear set connects the stepper motor and the locking assembly; the displacement detection assembly comprises three telescopic brackets evenly spaced and parallelly mounted on the fixed base, the telescopic brackets are respectively provided with a first displacement sensor, a second displacement sensor and a third displacement sensor, and the displacement detection assembly also comprises a signal mark detachably attached to a workpiece. The present invention can ensure the accurate processing position of the sealing ring groove and reduce the cracking of the sealing ring groove.

Description

Technical Field

[0001] The invention relates to the technical field of sealing ring groove processing, in particular to a processing method for a sealing ring groove of a supercharger. Background Art

[0002] The turbine shaft is one of the key components of a vehicle turbocharger, and is usually composed of a turbine impeller and a shaft.

[0003] In order to reduce the rotational inertia of the turbocharger rotor, the turbocharger turbine impeller can be made of titanium-aluminum alloy, ceramic and other materials with higher specific strength. For example, the density of titanium-aluminum alloy material is only 3.9×103kg / m3, while it has good high temperature performance and oxidation resistance, and has a large elastic modulus. The turbocharger turbine impeller made of titanium-aluminum alloy can greatly reduce the rotational inertia of the turbocharger.

[0004] However, when using new materials such as titanium aluminum alloy and ceramics to manufacture the turbocharger turbine impeller, due to the high hardness of titanium aluminum alloy and ceramics and the change of the overall stiffness and mass distribution characteristics of the turbine shaft, the existing process is easy to cause the sealing ring groove to crack during the processing of the turbine shaft sealing ring groove, and the surface quality of the sealing ring groove cannot be guaranteed, which seriously affects the sealing effect of the turbocharger turbine end. At the same time, during the processing, the position deviation of the workpiece will also seriously affect the performance of the sealing ring groove, affecting the installation of the sealing ring and the sealing effect after installation. Therefore, when the turbocharger turbine impeller uses new materials such as titanium aluminum alloy and ceramics, it is necessary to use a turbine shaft sealing ring groove processing method that is suitable for it to ensure the processing quality of the sealing ring groove. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method for processing a sealing ring groove of a supercharger, which can ensure the accuracy of the processing position of the sealing ring groove and reduce the cracking of the sealing ring groove.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A method for processing a sealing ring groove of a supercharger, comprising a clamping device and a controller, wherein the clamping device comprises a fixed base, a locking assembly is provided on the fixed base, a correction assembly is provided between the fixed base and the locking assembly, and a displacement detection assembly is provided on the fixed base; the correction assembly comprises a stepper motor fixedly mounted on the fixed base, a reduction gear set is connected to the output shaft of the stepper motor, and the reduction gear set connects the stepper motor and the locking assembly; the displacement detection assembly comprises three telescopic brackets evenly spaced and parallelly mounted on the fixed base, the telescopic brackets are respectively provided with a first displacement sensor, a second displacement sensor and a third displacement sensor, and the displacement detection assembly also comprises a signal mark detachably attached to a workpiece; the method for processing a sealing ring groove using the above-mentioned clamping device comprises the following steps:

[0008] S1, install the workpiece to the locking assembly for fixing, attach the signal mark to the position on the workpiece where the milling groove is not required, and ensure that the initial state of the second displacement sensor is aligned with the signal mark;

[0009] S2, determining the milling slot position, setting the milling slot parameters for the CNC machine tool, and controlling the blade to perform milling slot processing on the workpiece;

[0010] S3, during the processing, the middle displacement sensor No. 2 monitors whether the signal mark is displaced, and the displacement sensors No. 1 and No. 3 on both sides assist in monitoring. The measured offset distance between the initial state and the displacement sensor No. 1 and No. 3 is the offset range allowed for workpiece processing. When the signal mark appears in the monitoring range of one of the displacement sensors No. 1 and No. 3, a feedback signal is given to the controller;

[0011] S4, the controller controls the stepper motor to rotate and adjust the locking assembly so that the signal mark returns to the initial standard monitoring position of the second displacement sensor.

[0012] S5, the machining process keeps the workpiece always within the displacement range allowed in the initial state until the machining is completed.

[0013] Furthermore, the second displacement sensor is a linear displacement sensor or an angular displacement sensor. The angular displacement sensor can accurately track and monitor the offset angle. The first and third displacement sensors are linear displacement sensors.

[0014] Furthermore, the locking assembly includes a three-jaw chuck, and the three-jaw chuck is provided with a rotating seat, and the rotating seat is meshingly connected with the reduction gear set.

[0015] Furthermore, a pointed milling cutter is used for processing, and the milling cutter is used in a spiral diffusion manner from the inner ring wall of the groove to the outer ring wall, and the processing is carried out in layers from the surface to the inside.

[0016] Furthermore, a distance-adjusting slide groove is provided on the fixed base, the telescopic bracket is slidably embedded in the distance-adjusting slide groove, and a scale ruler is provided on the groove wall of the distance-adjusting slide groove.

[0017] Beneficial effects of the present invention:

[0018] In actual use scenarios, displacement sensors No. 1, No. 2 and No. 3 are used to monitor the position offset of the workpiece during processing and reduce processing errors. The No. 2 displacement sensor located in the middle is the standard monitoring, and the No. 1 and No. 3 displacement sensors are used to monitor the maximum allowable position of the forward and reverse offsets. When the offset reaches the monitoring range of the No. 1 and No. 3 displacement sensors, it means that the allowable offset has reached the maximum value, and it is necessary to repair and correct the processing position of the workpiece in time. Because the material hardness of the supercharger is relatively large, there will be greater resistance during the milling process, and it is easy to offset. The pointed milling cutter is used for processing, which can reduce the contact area between the tool and the workpiece and reduce the probability of cracking. The milling cutter is spirally diffused from the inner ring wall to the outer ring wall of the groove, and the processing is layered from the surface to the inside. The specific milling path is set. If the workpiece is offset, it will definitely affect the processing accuracy of the groove, so it needs to be corrected in time. The stepper motor is connected to the reduction gear set to slowly correct the workpiece to prevent the reverse force between the workpiece and the milling cutter from increasing rapidly, damaging the tool and affecting the processing. The present invention can ensure that the processing position of the sealing ring groove is accurate and reduce the cracking of the sealing ring groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present invention.

[0021] Reference numerals:

[0022] 1-fixed base; 11-adjustable slide; 2-locking assembly; 21-three-jaw chuck; 22-rotating seat; 3-correction assembly; 31-stepping motor; 32-reduction gear set; 4-displacement detection assembly; 41-telescopic bracket; 42-displacement sensor No. 1; 43-displacement sensor No. 2; 44-displacement sensor No. 3; 45-signal marker. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments and drawings. The contents mentioned in the implementation modes are not intended to limit the present invention.

[0024] Example 1

[0025] like Figure 1-2As shown, a method for processing a supercharger sealing ring groove includes a clamping device and a controller, the clamping device includes a fixed base 1, a locking assembly 2 is provided on the fixed base 1, a correction assembly 3 is provided between the fixed base 1 and the locking assembly 2, and a displacement detection assembly 4 is provided on the fixed base 1; the correction assembly 3 includes a stepper motor 31 fixedly mounted on the fixed base 1, a reduction gear set 32 ​​is connected to the output shaft of the stepper motor 31, and the reduction gear set 32 ​​connects the stepper motor 31 and the locking assembly 2; the displacement detection assembly 4 includes three telescopic brackets 41 evenly spaced and parallelly installed on the fixed base 1, the telescopic brackets 41 are respectively provided with a first displacement sensor 42, a second displacement sensor 43 and a third displacement sensor 44, and the displacement detection assembly 4 also includes a signal marker 45 detachably attached to the workpiece.

[0026] The second displacement sensor 43 is a linear displacement sensor or an angular displacement sensor. The angular displacement sensor can accurately track and monitor the offset angle. The first displacement sensor 42 and the third displacement sensor 44 are linear displacement sensors.

[0027] The locking assembly 2 includes a three-jaw chuck 21 , on which a rotating seat 22 is disposed. The rotating seat 22 is meshedly connected with the reduction gear set 32 ​​.

[0028] The fixed base 1 is provided with a distance-adjusting slide groove 11 , and the telescopic bracket 41 is slidably embedded in the distance-adjusting slide groove 11 . A scale is provided on the groove wall of the distance-adjusting slide groove 11 .

[0029] In this embodiment, displacement sensor No. 1 42, displacement sensor No. 2 43 and displacement sensor No. 3 44 are used to monitor the position offset of the workpiece during processing and reduce processing errors. Displacement sensor No. 2 43 located in the middle position is used for standard monitoring, and displacement sensor No. 1 42 and displacement sensor No. 3 44 are used to monitor the maximum allowable position of the offset in the forward and reverse directions. When the offset reaches the monitoring range of displacement sensor No. 1 42 and displacement sensor No. 3 44, it means that the allowable offset has reached the maximum value, and it is necessary to repair and correct the processing position of the workpiece in time. Because the material hardness of the supercharger is relatively large, there will be greater resistance during the milling process, and it is easy to offset. A pointed milling cutter is selected for processing, which can reduce the contact area between the tool and the workpiece and reduce the probability of cracking. The milling cutter is spirally diffused from the inner ring wall to the outer ring wall of the groove, and layered processing is performed from the surface to the inside. A specific groove milling path is set. If the workpiece is offset, the processing accuracy of the groove will inevitably be affected, so it needs to be corrected in time. The stepper motor 31 is connected to the reduction gear set 32 ​​to perform slow correction on the workpiece in order to prevent the reverse force between the workpiece and the milling cutter from increasing suddenly, damaging the cutter and affecting the processing. The device can ensure the accurate processing position of the sealing ring groove and reduce the cracking of the sealing ring groove.

[0030] Example 2

[0031] The workpiece is fixed to the locking assembly 2, and the signal mark 45 is attached to the position on the workpiece where the groove is not required, and the initial state of the second displacement sensor 43 is ensured to be aligned with the signal mark 45, and the position at this time is recorded as point A; the groove milling position is determined, the groove milling parameters are set for the CNC machine tool, and the blade is controlled to perform groove milling on the workpiece. During the processing, the middle second displacement sensor 43 monitors whether the signal mark 45 is displaced, and the first displacement sensor 42 and the third displacement sensor 44 on both sides assist in monitoring, and the measurement allowable offset distance L between the initial state and the first displacement sensor 42 is set, and the measurement allowable offset distance -L between the first displacement sensor 44 and the third displacement sensor 44 is set. The point after the signal mark 43 deflects with the workpiece is recorded as point B. When the absolute value of the distance between point A and point B is equal to L, the controller receives feedback data, controls the stepper motor 31 to start, judges the correction direction according to the positive and negative values ​​of the distance between point A and point B, and starts correction. When the distance between point A and point B is 0 again, the correction is stopped. During the processing, the workpiece is always kept in the displacement range allowed by the initial state until the processing is completed.

[0032] A pointed milling cutter is used for processing, and the milling cutter is used in a spiral diffusion manner from the inner ring wall of the groove to the outer ring wall, and the processing is carried out in layers from the surface to the inside.

[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, those skilled in the art can make a variety of similar expressions without violating the purpose and claims of the present invention, and such changes all fall within the protection scope of the present invention.

Claims

1. A method for processing a supercharger sealing ring groove, characterized in that: The invention comprises a clamping device and a controller, wherein the clamping device comprises a fixed base (1), a locking assembly (2) is provided on the fixed base (1), a correction assembly (3) is provided between the fixed base (1) and the locking assembly (2), and a displacement detection assembly (4) is provided on the fixed base (1); The correction component (3) comprises a stepper motor (31) fixedly mounted on the fixed base (1), a reduction gear set (32) being connected to the output shaft of the stepper motor (31), and the reduction gear set (32) connecting the stepper motor (31) and the locking component (2); The displacement detection assembly (4) comprises three telescopic brackets (41) which are evenly spaced and installed in parallel on the fixed base (1), and the telescopic brackets (41) are respectively provided with a first displacement sensor (42), a second displacement sensor (43) and a third displacement sensor (44), and the displacement detection assembly (4) also comprises a signal mark (45) which is detachably attached to the workpiece; The method for processing the sealing ring groove using the above-mentioned clamping device comprises the following steps: S1, installing the workpiece to the locking assembly (2) for fixing, attaching the signal mark (45) to a position on the workpiece where no groove milling is required, and ensuring that the initial state of the second displacement sensor (43) is aligned with the signal mark (45); S2, determining the milling slot position, setting the milling slot parameters for the CNC machine tool, and controlling the blade to perform milling slot processing on the workpiece; S3, during the processing, the middle displacement sensor No. 2 (43) monitors whether the signal mark (45) is displaced, and the displacement sensors No. 1 (42) and No. 3 (44) on both sides assist in monitoring. The initial state and the measured offset distance between the displacement sensor No. 1 (42) and the displacement sensor No. 3 (44) are the offset range allowed for workpiece processing. When the signal mark (45) appears in the monitoring range of one of the displacement sensor No. 1 (42) and the displacement sensor No. 3 (44), a feedback signal is given to the controller; S4, the controller controls the stepping motor (31) to rotate and adjust the locking assembly (2), so that the signal mark (45) returns to the initial standard monitoring position of the second displacement sensor (43); S5, the machining process keeps the workpiece always within the displacement range allowed in the initial state until the machining is completed.

2. The method for processing a supercharger sealing ring groove according to claim 1, characterized in that: The second displacement sensor (43) is a linear displacement sensor or an angular displacement sensor. The angular displacement sensor can accurately track and monitor the offset angle. The first displacement sensor (42) and the third displacement sensor (44) are linear displacement sensors.

3. The method for processing a supercharger sealing ring groove according to claim 1, characterized in that: The locking assembly (2) comprises a three-jaw chuck (21), a rotating seat (22) is provided on the three-jaw chuck (21), and the rotating seat (22) is meshingly connected with the reduction gear set (32).

4. The method for processing a supercharger sealing ring groove according to claim 1, characterized in that: A pointed milling cutter is used for processing, and the milling cutter is used in a spiral diffusion manner from the inner ring wall to the outer ring wall of the groove, and the processing is carried out in layers from the surface to the inside.

5. The method for processing a supercharger sealing ring groove according to claim 1, characterized in that: The fixed base (1) is provided with a distance-adjusting slide groove (11), the telescopic bracket (41) is slidably embedded in the distance-adjusting slide groove (11), and a scale is provided on the groove wall of the distance-adjusting slide groove (11).

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