Eccentric inner hole turning tool

Abstract

The utility model discloses an eccentric inner hole turning tool which is used for compensating the eccentric distance of an eccentric conical surface of a nozzle diffuser cover, so that the nozzle diffuser cover is convenient to machine, and the stable quality of the nozzle diffuser cover is ensured. Comprising a cylindrical eccentric positioning plate, the peripheral face of the eccentric positioning plate is in a step shape, an annular boss is arranged in the middle of the peripheral face of the eccentric positioning plate, the outer side end face of the eccentric positioning plate is used for being positioned on a machine tool workbench, and the annular boss of the eccentric positioning plate is used for being fixed to an outer cylinder at the small end of the nozzle diffuser cover. The outer circle face of the inner side end of the eccentric positioning plate is used for being attached to the inner circle face of an outer cylinder at the small end of the nozzle diffuser cover for positioning. An annular groove used for alignment is formed in an orifice in the inner side end of the eccentric positioning plate, and the axis of the annular groove and the axis of the eccentric conical face of the nozzle diffuser cover are located on the same straight line.

Description

Technical Field

[0001] The utility model relates to the technical field of nozzle diffusers, in particular to an eccentric internal hole turning tool. Background Art

[0002] As an important exhaust device at the turbine end of a supercharger, the main function of a nozzle diffuser is to decelerate and guide gas. After the exhaust gas drives the turbine blades to rotate, it flows into the nozzle diffuser. Due to the special structure of the nozzle diffuser, the air flow deviates from the free flow trajectory and flows in the direction of increasing direction angle, increasing the flow area of the gas to achieve the purpose of deceleration. Since there is an eccentricity between the inner hole conical surface and the outer circle reference of the nozzle diffuser, it is not convenient for direct machining. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide an eccentric internal hole turning tool, which compensates the eccentricity of the eccentric conical surface of the nozzle diffuser cover by using the turning tool, facilitating the machining of the nozzle diffuser cover and ensuring the stable quality of the nozzle diffuser cover.

[0004] The purpose of the utility model is achieved as follows:

[0005] An eccentric internal hole turning tool includes an eccentric positioning plate in a cylindrical shape. The outer peripheral surface of the eccentric positioning plate is in a stepped shape. There is an annular boss in the middle of the outer peripheral surface of the eccentric positioning plate. The outer end face of the eccentric positioning plate is used for positioning on the machine tool workbench. The annular boss of the eccentric positioning plate is used for fixing with the outer cylinder at the small end of the nozzle diffuser cover. The outer cylindrical surface at the inner end of the eccentric positioning plate is used for fitting and positioning with the inner cylindrical surface of the outer cylinder at the small end of the nozzle diffuser cover;

[0006] There is a ring groove for alignment at the inner end hole of the eccentric positioning plate, and the axis of this ring groove is on the same straight line as the axis of the eccentric conical surface of the nozzle diffuser cover.

[0007] Preferably, there are marked lines corresponding to the eccentric direction on the eccentric positioning plate.

[0008] Preferably, the inner end face of the annular boss of the eccentric positioning plate is in contact and positioned with the end face of the outer cylinder at the small end of the nozzle diffuser cover, and the annular boss of the eccentric positioning plate is connected to the end face of the outer cylinder at the small end of the nozzle diffuser cover through screws and positioning pins.

[0009] Due to the adoption of the above technical solution, the utility model has the following beneficial effects:

[0010] This patent provides an eccentric internal hole turning tool, aiming to solve the problem of non - concentricity during the turning of the internal hole conical surface and the outer - circle reference. The present invention adopts an eccentric internal hole turning tool. The working principle of this tool is to transfer the eccentricity between the reference internal hole of the workpiece and the eccentric conical surface to the turning tool by using an eccentric positioning plate, and compensate for the eccentricity through the machine tool's centering circle, ultimately meeting the workpiece processing requirements.

[0011] After the workpiece is positioned by the turning tool, the eccentric conical surface of the internal hole can be directly machined on the machine tool. Since the eccentricity of the conical surface has been compensated by the turning tool, the machining of the internal hole conical surface of this workpiece is no different from that of an ordinary part. This tool simplifies the machining steps of eccentric workpieces, reduces the preparation time before workpiece machining, unifies the machining reference, reduces machining errors, and improves the quality stability of workpiece machining. Description of the Drawings

[0012] Figure 1 It is a schematic assembly diagram of the nozzle diffuser;

[0013] Figure 2 It is a schematic machining diagram of the nozzle diffuser cover;

[0014] Figure 3 It is a schematic diagram of the eccentric turning tool;

[0015] Figure 4 It is a schematic diagram of the eccentric positioning plate;

[0016] Figure 5 It is a schematic diagram of the 30 - process;

[0017] Figure 6 It is a schematic diagram of the 40 - process;

[0018] Figure 7 It is a schematic diagram of the 50 - process;

[0019] Figure 8 It is a schematic diagram of the 80 - process. Detailed Embodiment

[0020] An eccentric internal hole turning tool includes an eccentric positioning plate 1 in a cylindrical shape. The outer peripheral surface of the eccentric positioning plate 1 is in a stepped shape. There is an annular boss in the middle of the outer peripheral surface of the eccentric positioning plate 1. The outer end face of the eccentric positioning plate 1 is used for positioning on the machine tool workbench. The annular boss of the eccentric positioning plate 1 is used for fixing with the outer cylinder at the small end of the nozzle diffuser cover. The outer cylindrical surface at the inner end of the eccentric positioning plate 1 is used for fitting and positioning with the inner cylindrical surface of the outer cylinder at the small end of the nozzle diffuser cover.

[0021] There is a ring groove for centering at the inner - end hole opening of the eccentric positioning plate 1, and the axis of this ring groove is on the same straight line as the axis of the eccentric conical surface of the nozzle diffuser cover.

[0022] The inner end face of the annular boss of the eccentric positioning plate 1 is in fit positioning with the outer cylinder end face of the small end of the nozzle diffuser cover, and the annular boss of the eccentric positioning plate 1 is connected to the outer cylinder end face of the small end of the nozzle diffuser cover through screws 2 and positioning pins 3. A marking line corresponding to the eccentric direction is provided on the eccentric positioning plate 1.

[0023] Description of the processing process route:

[0024] 10 Sand cleaning: The blank is a casting, and the residual sand needs to be cleaned before processing;

[0025] 20 Marking: After leveling the starting surface of the workpiece for processing, mark the processing lines of each end face and the calibration circle line for processing;

[0026] 30 Rough turning: Rough turn the blank to remove most of the allowance at the small end;

[0027] 40 Rough turning: Rough turn the taper surface with allowance;

[0028] 50 Finish turning: Finish turn the dimensions of the small end;

[0029] 60 Marking: Mark the vertical center line on the large end face with a marked position for alignment in subsequent processes;

[0030] 70 Numerical control drilling: Drill each hole and positioning hole of the workpiece;

[0031] 80 Finish turning: Finish turn the eccentric inner hole and taper surface;

[0032] 90 Fitting: Remove burrs and chamfer the hole openings.

[0033] Instructions for using turning tools:

[0034] First, place the turning tool on the machine tool workbench. After aligning the inner hole of the turning tool, clamp the part. To facilitate distinguishing the eccentric direction of the workpiece, align the casting marked position with the marking line of the turning tool when installing the workpiece. After the workpiece is pressed tightly and safety is ensured, the workpiece processing is completed.

[0035] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in terms of form and details without departing from the scope defined by the claims of the present invention.

Claims

1. An eccentric inner hole turning tool, characterized in that: It includes a cylindrical eccentric positioning plate, the outer peripheral surface of the eccentric positioning plate is stepped, an annular boss is provided in the middle of the outer peripheral surface of the eccentric positioning plate, the outer end surface of the eccentric positioning plate is used to be positioned on the machine tool workbench, the annular boss of the eccentric positioning plate is used to be fixed with the outer cylinder of the small end of the nozzle diffuser cover, and the inner end outer cylindrical surface of the eccentric positioning plate is used to fit and position with the inner cylindrical surface of the outer cylinder of the small end of the nozzle diffuser cover; An annular groove for alignment is provided at the inner end opening of the eccentric positioning plate, and the axis center line of the annular groove is located on the same straight line as the axis center line of the eccentric cone surface of the nozzle diffuser cover.

2. The eccentric inner hole turning tool according to claim 1, characterized in that: The eccentric positioning plate is provided with a marking line corresponding to the eccentric direction.

3. The eccentric inner hole turning tool according to claim 1, characterized in that: The inner end face of the annular boss of the eccentric positioning plate is fitted and positioned with the outer cylinder end face of the small end of the nozzle diffuser cover, and the annular boss of the eccentric positioning plate is connected with the outer cylinder end face of the small end of the nozzle diffuser cover through screws and positioning pins.

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