Supercharger impeller housing machining method and machining device

Abstract

The invention relates to the technical field of supercharger impeller housing machining, in particular to a supercharger impeller housing machining method and device. Comprising an outer pressing plate, an inner pressing plate, a screw rod, a fixing screw and a base, the outer pressing plate is fixedly connected with the base through the fixing screw and located at one end of the base, the inner pressing plate is connected with the screw rod in a sliding mode and arranged on the screw rod in a sleeving mode, the screw rod is connected with the base in a threaded mode and located at the inner bottom of the base, and the inner pressing plate is further located in the base. The stress condition during part machining is changed, the situation that the size and the form and location tolerance of the part cannot meet the design requirements due to clamping deformation during machining is improved, and in this way, the problems that according to the actual use requirements of the impeller housing, the wall thickness is small, the part strength is poor during machining, the part is prone to deformation in the machining process, and the machining cost is low are effectively solved. The size is out of tolerance after machining, and the use requirement cannot be met.

Description

Technical Field

[0001] The invention relates to the technical field of supercharger impeller casing processing, and in particular to a supercharger impeller casing processing method and processing device. Background Art

[0002] In recent years, with the changes in the international situation, my country's shipbuilding industry has developed rapidly, and its market share has maintained a leading position in the world. As an important component of the marine diesel engine, the main power unit of the ship, the technical level of the supercharger directly affects the working efficiency of the marine diesel engine. The impeller cover is an important part of the supercharger. Its material is GGG40, and the blank is cast as a whole. It mainly maintains a sufficient gap with the compressor impeller to ensure the normal operation of the compressor impeller. According to the structural characteristics of the impeller cover, its processing method mainly adopts turning.

[0003] However, due to the actual use requirements of the impeller cover, its wall thickness is relatively thin, the strength of the parts is poor during processing, and the parts are easily deformed during the processing, resulting in excessive dimensions after processing and failure to meet the use requirements. Summary of the invention

[0004] The purpose of the present invention is to provide a supercharger impeller cover processing method and processing device, aiming to solve the technical problems in the prior art that due to the actual use needs of the impeller cover, the wall thickness is relatively thin, the strength of the parts is poor during processing, the parts are easily deformed during the processing, resulting in out-of-tolerance dimensions after processing and failure to meet the use requirements.

[0005] To achieve the above-mentioned purpose, the present invention adopts a supercharger impeller casing processing device, including an outer pressure plate, an inner pressure plate, a screw, a fixing screw and a base, the outer pressure plate is fixedly connected to the base by the fixing screw and is located at one end of the base, the inner pressure plate is slidably connected to the screw and is sleeved on the screw, the screw is threadedly connected to the base and is located at the inner bottom of the base, and the inner pressure plate is also located inside the base.

[0006] Wherein, an anti-rotation screw is arranged on the bottom plane of the base, and the anti-rotation screw is also arranged at an end of the screw rod away from the inner pressure plate, and the tail of the anti-rotation screw is flush with the bottom plane of the base.

[0007] Wherein, a tightening screw is arranged at the other end of the base, and the tightening screw is threadedly connected to the base.

[0008] The present invention also provides a method for processing a supercharger impeller casing, which is applied to the supercharger impeller casing processing device described above and comprises the following steps:

[0009] S1: Clamp the tooling on the lathe workbench, use drilling equipment to drill a process countersink on the large end surface of the turbocharger impeller cover, and adjust the machine tool cutting parameters according to actual requirements;

[0010] S2: Install the impeller housing of the supercharger in the base, use the outer circle of the small end step and the reverse plane of the large end for positioning, then align and locate the inner hole and use the inner pressure plate to press the end face of the large end countersunk hole;

[0011] S3: Use a marker pen to mark the part of the supercharger impeller cover that needs to be processed, and use a rough turning tool to perform rough turning on the supercharger impeller cover. After completion, replace the fine turning tool, and fine turn the large outer circle and large end face, then press the large end face with the outer pressure plate, remove the inner pressure plate, and fine turn the inner hole and profile.

[0012] Among them, the specific steps of adjusting the machine tool cutting parameters according to actual requirements in step S1 are: adjusting the cutting parameters, divided into five-cut processing, and the processing allowances are 0.3mm, 0.2mm, 0.2mm, 0.2mm, and 0.1mm respectively.

[0013] Among them, in step S2: the specific steps of using the small end step outer circle and the large end anti-plane for positioning are: contacting the outer circle part of the supercharger impeller cover with the inner side part of the base, and using the steps of both for positioning.

[0014] The invention provides a method and device for processing a supercharger impeller cover, comprising an outer pressure plate, an inner pressure plate, a screw, a fixing screw and a base, wherein the outer pressure plate is fixedly connected to the base by the fixing screw and is located at one end of the base, the inner pressure plate is slidably connected to the screw and sleeved on the screw, the screw is threadedly connected to the base and is located at the inner bottom of the base, and the inner pressure plate is also located in the base. By using special tools for clamping, the stress conditions of parts during processing are changed, and the situation that the size and shape and position tolerances of parts do not meet the design requirements due to clamping deformation during processing is improved. In this way, the technical problem that the wall thickness of the impeller cover is relatively thin due to actual use needs, the strength of the parts during processing is poor, the parts are easily deformed during processing, the size after processing is out of tolerance, and the use requirements cannot be met is effectively solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1It is a schematic diagram of the internal structure of the supercharger impeller casing.

[0017] Figure 2 It is a schematic diagram of the structure of the rough-turned turbocharger impeller cover before process optimization.

[0018] Figure 3 It is a schematic diagram of the structure of the turbocharger impeller cover before process optimization.

[0019] Figure 4 It is a schematic diagram of the structure of the rough-turned turbocharger impeller casing after process optimization.

[0020] Figure 5 It is a schematic diagram of the structure of the turbocharger impeller cover after process optimization.

[0021] Figure 6 It is a schematic diagram of the internal structure of a supercharger impeller casing processing method and processing device of the present invention.

[0022] Figure 7 It is a schematic diagram of the internal structure of the base in the supercharger impeller shell processing method and processing device of the present invention.

[0023] Figure 8 It is a top view of the base in the supercharger impeller shell processing method and processing device of the present invention.

[0024] Fig. 9 It is a schematic diagram of the internal structure of the inner pressure plate in the supercharger impeller shell processing method and processing device of the present invention.

[0025] Fig.10 It is a schematic diagram of the internal structure of the outer pressure plate in the supercharger impeller shell processing method and processing device of the present invention.

[0026] Fig.11 It is a top view of the inner pressure plate in the supercharger impeller casing processing method and processing device of the present invention.

[0027] Fig.12 It is a structural schematic diagram of a screw in a supercharger impeller casing processing method and processing device of the present invention.

[0028] Fig.13 The invention discloses a flowchart of the steps of a method for processing a supercharger impeller casing.

[0029] 1-outer pressure plate, 2-inner pressure plate, 3-screw, 4-fixing screw, 5-base, 6-anti-rotation screw, 7-tensioning screw, 8-supercharger impeller casing body. DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below, examples of which 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.

[0031] See also Figures 1 to 13 The present invention provides a supercharger impeller casing processing device, including an outer pressure plate 1, an inner pressure plate 2, a screw 3, a fixing screw 4 and a base 5, wherein the outer pressure plate 1 is fixedly connected to the base 5 by the fixing screw 4 and is located at one end of the base 5, the inner pressure plate 2 is slidably connected to the screw 3 and is sleeved on the screw 3, the screw 3 is threadedly connected to the base 5 and is located at the inner bottom of the base 5, and the inner pressure plate 2 is also located in the base 5.

[0032] In this embodiment, special tools are used for clamping to change the stress conditions during part processing, and the situation in which the size and shape and position tolerances of the parts do not meet the design requirements due to clamping deformation during processing is improved. In this way, the technical problem that due to the actual use needs of the impeller cover, the wall thickness is relatively thin, the strength of the parts is poor during processing, and the parts are easily deformed during the processing, resulting in out-of-tolerance dimensions after processing and failure to meet the use requirements is effectively solved.

[0033] Furthermore, an anti-rotation screw 6 is provided on the bottom plane of the base 5 , and the anti-rotation screw 6 is also provided at one end of the screw rod 3 away from the inner pressure plate 2 , and the tail of the anti-rotation screw 6 is flush with the bottom plane of the base 5 .

[0034] In this embodiment, the anti-rotation screw 6 can be used to prevent the screw rod 3 from rotating when the inner pressure plate 2 is tightened. After the screw rod 3 is installed into the base 5, an anti-rotation screw 6 hole is designed, and the anti-rotation screw 6 cannot be higher than the bottom plane of the base 5 after installation, so as to prevent interference when the bottom plane of the base 5 contacts the lathe worktable.

[0035] Furthermore, a tightening screw 7 is provided at the other end of the base 5 , and the tightening screw 7 is threadedly connected to the base 5 .

[0036] In this embodiment, the tightening screw 7 can be used to tighten the other end of the workpiece, so that the workpiece is firmly fixed under the action of the fixing screw 4.

[0037] The present invention also provides a method for processing a supercharger impeller casing, which is applied to the supercharger impeller casing processing device described above and comprises the following steps:

[0038] S1: Clamp the tooling on the lathe workbench, use drilling equipment to drill a process countersink on the large end surface of the turbocharger impeller cover, and adjust the machine tool cutting parameters according to actual requirements;

[0039] S2: Install the impeller housing of the supercharger in the base 5, use the outer circle of the small end step and the reverse plane of the large end for positioning, then align and locate the inner hole and use the inner pressure plate 2 to press the end face of the large end countersunk hole;

[0040] S3: Use a marker pen to mark the part of the supercharger impeller housing that needs to be processed, and use a rough turning tool to perform rough turning on the supercharger impeller housing. After completion, replace the fine turning tool, and fine turn the large outer circle and the large end face, then use the outer pressure plate 1 to press the large end face, remove the inner pressure plate 2, and fine turn the inner hole and the profile.

[0041] Furthermore, in step S1, the specific steps of adjusting the cutting parameters of the machine tool according to actual requirements are: adjusting the cutting parameters, divided into five-cut processing, and the processing allowances are 0.3mm, 0.2mm, 0.2mm, 0.2mm, and 0.1mm respectively.

[0042] In this embodiment, after removing the large excess, the inner pressure plate 2 needs to be loosened and then lightly tightened again to reduce the influence of processing stress on part deformation.

[0043] Furthermore, in step S2: the specific steps of using the small end step outer circle and the large end anti-plane for positioning are: the outer circle of the supercharger impeller cover is brought into contact with the inner side of the base 5, and the steps of both are used for positioning.

[0044] In this embodiment, in terms of processing deformation, the tooling is clamped on the lathe workbench. Since the structural strength of the tooling is much greater than that of the soft three-jaw, when the tooling is clamped and positioned, the workpiece is not subject to the radial clamping force when clamped, and the radial deformation during clamping is greatly reduced, and no processing radial deformation will occur due to clamping deformation; at the same time, the outer pressure plate 1 and the inner pressure plate 2 are used axially to process the large plane and the inner hole surface respectively. The place where the outer pressure plate 1 presses is a solid, and a larger pressing force can be applied without deforming the workpiece, while the place where the inner pressure plate 2 presses is a suspended position. However, since the workpiece has an outer circle positioning, the workpiece will not fly out during rotation. Therefore, the clamping force of the inner pressure plate 2 is smaller when it is clamped. Compared with the use of soft three-jaw clamping, the stress on the workpiece will be greatly reduced, and the clamping deformation can be controlled within a smaller range, which significantly improves the processing quality of the workpiece.

[0045] In this embodiment, from the perspective of processing safety, a vertical lathe is used for processing, and the force direction of the workpiece and the tooling is in the vertical direction, which is consistent with the direction of gravity, and the clamping safety of the workpiece is more reliable.

[0046] In this embodiment, in terms of processing time, the original clamping method cannot have too large a clamping force and needs to consider processing deformation, resulting in a small cutting feed rate and a long processing time. However, when the outer pressure plate 1 is tightened in the improved processing method, a larger feed rate can be used to reduce processing time.

[0047] In this embodiment, in terms of clamping efficiency, when using soft three-jaw clamping, the soft three-jaw needs to be precision-turned to ensure that the soft three-jaw and the workpiece fit well when clamping, which increases the clamping and positioning time. At the same time, due to the influence of gravity, the workpiece is clamped slowly. If the positioning surface of the flat soft three-jaw does not fit well, it will affect the final axial dimension. Now, when using tooling and vertical lathes for processing, it is only necessary to place the tooling in the center of the workbench and align it. At the same time, due to the influence of gravity, the workpiece and the positioning plane of the tooling fit well, and there will be no problem of poor fit of the positioning surface affecting the axial dimension.

[0048] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A supercharger impeller casing processing device, characterized in that: It includes an outer pressure plate, an inner pressure plate, a screw, a fixing screw and a base. The outer pressure plate is fixedly connected to the base by the fixing screw and is located at one end of the base. The inner pressure plate is slidably connected to the screw and is sleeved on the screw. The screw is threadedly connected to the base and is located at the inner bottom of the base, and the inner pressure plate is also located inside the base.

2. The supercharger impeller casing processing device according to claim 1, characterized in that: The bottom plane of the base is provided with an anti-rotation screw, which is also provided at one end of the screw rod away from the inner pressure plate, and the tail of the anti-rotation screw is flush with the bottom plane of the base.

3. The supercharger impeller casing processing device according to claim 2, characterized in that: A tightening screw is arranged at the other end of the base, and the tightening screw is threadedly connected to the base.

4. A method for processing a supercharger impeller casing, applied to the supercharger impeller casing processing device as claimed in claim 3, characterized in that: The steps include: S1: Clamp the tooling on the lathe workbench, use drilling equipment to drill a process countersink on the large end surface of the turbocharger impeller cover, and adjust the machine tool cutting parameters according to actual requirements; S2: Install the impeller housing of the supercharger in the base, use the outer circle of the small end step and the reverse plane of the large end for positioning, then align and locate the inner hole and use the inner pressure plate to press the end face of the large end countersunk hole; S3: Use a marker pen to mark the part of the supercharger impeller cover that needs to be processed, and use a rough turning tool to perform rough turning on the supercharger impeller cover. After completion, replace the fine turning tool, and fine turn the large outer circle and large end face, then press the large end face with the outer pressure plate, remove the inner pressure plate, and fine turn the inner hole and profile.

5. The method for processing a supercharger impeller shell according to claim 4, characterized in that: The specific steps of adjusting the cutting parameters of the machine tool according to the actual requirements in step S1 are: adjusting the cutting parameters, divided into five-cut processing, and the processing allowances are 0.3mm, 0.2mm, 0.2mm, 0.2mm, and 0.1mm respectively.

6. The method for processing a supercharger impeller shell according to claim 5, characterized in that: In step S2, the specific steps of using the small end step outer circle and the large end anti-plane for positioning are: the outer circle of the supercharger impeller cover is brought into contact with the inner side of the base, and the steps of both are used for positioning.

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