Method for machining a bearing seat of a turbocharger and clamping tool therefor

Abstract

The present application relates to the field of mechanical processing, and particularly relates to a turbocharger bearing seat processing method and clamping tool thereof; comprising a bearing seat drilling jig, a bearing seat drilling tool and a bearing seat turning tool; the present application arranges the process route reasonably, processes the waist-shaped groove and hole after rough machining, avoids machining the hole and groove first, and avoids deformation after finishing machining; meanwhile, the turning tool is designed reasonably, clamping deformation is avoided, important dimensions and shape and position tolerance requirements are ensured by one-time clamping; the drilling tool is designed reasonably, the pin holes on the circumference are machined on the numerical control machining center at one time, the size and position requirements are ensured, and finally the parts meeting the drawing requirements are machined, so that the technical problems that the existing turbocharger bearing seat processing method in the prior art is prone to clamping deformation due to the copper parts and the local wall thickness being thin are solved.

Description

Technical Field

[0001] This invention relates to the field of machining, and in particular to a method for machining a bearing housing of a turbocharger and its clamping tool. Background Technology

[0002] A turbocharger is an air compressor driven by the exhaust gas produced by an internal combustion engine. Marine turbochargers are a type of turbocharger. As a component of diesel engines, marine turbochargers are turbocharger products independently developed by the company. The bearing housing, as a component of this product, plays a key role. As the supporting component of the bearing, the bearing housing has high requirements for dimensional accuracy and geometric tolerances. Its machining and manufacturing precision directly affects the overall performance of the turbocharger.

[0003] However, the existing methods for machining the bearing housing of turbochargers have the problem that the parts are made of copper and the wall thickness is too thin in some areas, making them prone to deformation during clamping. Summary of the Invention

[0004] The purpose of this invention is to provide a method for machining a bearing housing of a turbocharger and its clamping tool, aiming to solve the technical problem in the existing method for machining a bearing housing of a turbocharger, where the part is made of copper and has a thin local wall thickness, making it prone to deformation during clamping.

[0005] To achieve the above objectives, the present invention provides a bearing housing machining and clamping tool for a turbocharger, comprising a bearing housing drill jig, a bearing housing drilling fixture, and a bearing housing turning fixture.

[0006] The bearing housing drill jig is used to clamp the bearing housing of the turbocharger to machine the holes on the end face and mill the waist-shaped groove.

[0007] The bearing housing drilling fixture is used to clamp the bearing housing of the turbocharger for machining the circumferential pin holes and waist-shaped grooves.

[0008] The bearing housing fixture is used to clamp the bearing housing of the turbocharger for machining the large end face and outer circle, and the small end face and outer circle.

[0009] The bearing housing drill jig includes a fixed jig body, a movable jig body, a first screw, and a positioning pin. One end of the first screw passes through the movable jig body and is tightened onto the fixed jig body. The positioning pin is disposed on the movable jig body, and a drill sleeve is disposed on the fixed jig body.

[0010] The bearing housing drill jig also includes a washer, which is fitted onto the first screw and contacts the moving mold body.

[0011] The number of drill sleeves is multiple.

[0012] The bearing housing drilling fixture includes a main body, a pin, a second screw, and a first pressure plate. The main body is positioned by the outer diameter and end face of the large end of the part and by the pin. The second screw is connected to the first pressure plate.

[0013] The bearing housing tooling includes a body, a screw, a second pressure plate, and a clamping assembly. The clamping assembly is mounted on the body, and the screw cooperates with the second pressure plate to press the part against the small end face.

[0014] The bearing housing tooling also includes a protective component, which is disposed on the clamping assembly.

[0015] The present invention also provides a method for machining a bearing housing of a turbocharger, which is applied to the machining and clamping tool for the bearing housing of a turbocharger as described above.

[0016] Includes the following steps:

[0017] First, the workpiece undergoes heat treatment;

[0018] After heat treatment, the workpiece is rough-machined to remove excess material.

[0019] Then, mark the center crosshair and the position line of the waist-shaped groove on the workpiece after removing the excess material;

[0020] Use processing equipment to align and scribing the holes and oblong grooves on the end face;

[0021] The bearing seat drilling tool is used to fix the workpiece after the holes and waist-shaped grooves on the machined end face are completed, and the pin holes and waist-shaped grooves on the circumference are machined.

[0022] The bearing housing drill jig is used to fix the workpiece with the circumferential pin hole and waist groove completed by machining, and then countersinking is performed.

[0023] After the countersinking is completed, the workpiece is fixed using the bearing seat lathe tooling, and then the large end face and outer circle, and the small end face and outer circle are machined.

[0024] Finally, deburring is performed on the machined workpiece to obtain the bearing housing of the turbocharger.

[0025] This invention discloses a method for machining a turbocharger bearing housing and its clamping tool. By rationally arranging the process route, the invention machines a waist-shaped groove and hole after rough machining, avoiding deformation that occurs after finishing the hole and groove during finishing. Simultaneously, a rationally designed turning fixture prevents clamping deformation, ensuring important dimensions and their geometric tolerances are met in a single clamping operation. A rationally designed drilling fixture is used to machine the circumferential pin hole in one operation on a CNC machining center, ensuring its dimensional and positional requirements. Finally, a part that meets the drawing requirements is machined. This method solves the technical problem in existing turbocharger bearing housing machining methods where the part is made of copper and has locally thin walls, making it prone to clamping deformation. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the bearing housing drill jig of the present invention.

[0028] Figure 2 This is a partial structural schematic diagram of the bearing housing drill jig of the present invention.

[0029] Figure 3 This is a schematic diagram of the bearing housing drilling tool of the present invention.

[0030] Figure 4 This is a schematic diagram of the bearing housing tooling of the present invention.

[0031] Figure 5 This is a schematic diagram of rough machining of the large end and hole in the bearing housing machining method of the turbocharger of the present invention.

[0032] Figure 6 This is a schematic diagram of rough machining the outer diameter and inner hole of the small end in the bearing housing machining method of the turbocharger of the present invention.

[0033] Figure 7 This is a schematic diagram of the precision machining of the large end face and inner hole in the bearing housing machining method of the turbocharger of the present invention.

[0034] Figure 8 This is a schematic diagram of the outer diameters of each of the large end, the A and B references, and the inner end face dimensions in the machining method of the bearing housing of the turbocharger of the present invention.

[0035] Figure 9 This is a schematic diagram of the machining process of the bearing housing of the turbocharger of the present invention.

[0036] In the figure: 1-fixed mold body, 2-moving mold body, 3-first screw, 4-locating pin, 5-washer, 6-drill bushing, 7-main body, 8-pin, 9-second screw, 10-first pressure plate, 11-body, 12-screw, 13-second pressure plate, 14-clamping assembly, 15-protective component. Detailed Implementation

[0037] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0038] Please see Figures 1-4 ,in Figure 1 This is a schematic diagram of the bearing housing drill jig of the present invention. Figure 2 This is a partial structural schematic diagram of the bearing housing drill jig of the present invention. Figure 3 This is a schematic diagram of the bearing housing drilling tool of the present invention. Figure 4 This is a schematic diagram of the bearing housing tooling of the present invention.

[0039] This invention provides a bearing housing machining and clamping tool for a turbocharger, including a bearing housing drill jig, a bearing housing drilling fixture, and a bearing housing turning fixture;

[0040] The bearing housing drill jig is used to clamp the bearing housing of the turbocharger to machine the holes on the end face and mill the waist-shaped groove.

[0041] The bearing housing drilling fixture is used to clamp the bearing housing of the turbocharger for machining the circumferential pin holes and waist-shaped grooves.

[0042] The bearing housing fixture is used to clamp the bearing housing of the turbocharger for machining the large end face and outer circle, and the small end face and outer circle.

[0043] In this specific embodiment, the present invention, through a reasonable process route, produces the waist-shaped groove and hole after rough machining, avoiding deformation that occurs after finishing machining the hole and groove first. Simultaneously, a reasonable machining fixture is designed to prevent clamping deformation, ensuring important dimensions and their geometric tolerances are met in a single clamping operation. A reasonable drilling fixture is also designed to machine the circumferential pin hole in one operation on a CNC machining center, ensuring its dimensional and positional requirements are met. Finally, a part that meets the drawing requirements is produced. This method solves the technical problem in existing turbocharger bearing housing machining methods where the part is made of copper, resulting in thinner local walls and easy clamping deformation.

[0044] The bearing housing drill jig includes a fixed jig body 1, a movable jig body 2, a first screw 3 and a positioning pin 4. One end of the first screw 3 passes through the movable jig body 2 and is tightened onto the fixed jig body 1. The positioning pin 4 is disposed on the movable jig body 2. A drill sleeve 6 is disposed on the fixed jig body 1.

[0045] The bearing housing drill jig also includes a washer 5, which is sleeved on the first screw 3 and contacts the moving mold body 2;

[0046] The number of drill sleeves 6 is multiple;

[0047] The parts are pressed together by connecting the fixed mold body 1 and the moving mold body 2 with the first screw 3 and the positioning pin 4. Before pressing, the position is fixed by the positioning pin 4. Due to the reduced stability of the drilling machine spindle, in this process, each hole on the large end face is machined by a GM100 CNC milling machine, and several pin holes on the circumference are completed on a VCN535 CNC milling machining center.

[0048] Secondly, the bearing seat drilling fixture includes a main body 7, a pin 8, a second screw 9 and a first pressure plate 10. The main body 7 is positioned by the outer circle and end face of the large end of the part and by the pin 8. The second screw 9 is connected to the first pressure plate 10.

[0049] The main body 7 is positioned by the outer circle and end face of the large end of the part, and is positioned by the pin 8. The part is pressed by the second screw 9 in cooperation with the first pressure plate 10.

[0050] Meanwhile, the bearing seat tooling includes a body 11, a screw 12, a second pressure plate 13 and a clamping assembly 14. The clamping assembly 14 is disposed on the body 11, and the screw 12 cooperates with the second pressure plate 13 to press the part on the small end face.

[0051] The bearing housing tooling also includes a protective component 15, which is disposed on the clamping assembly 14;

[0052] When the machine approaches the large end face and outer circle, the screw 12 is used to press the second pressure plate 13 onto the small end face to press the part tightly; when the small end outer circle and end face are machined, the clamping assembly 14 is used to press the part tightly, and the protective component 15 is used to prevent the part from being crushed.

[0053] This invention utilizes a turbocharger bearing housing machining and clamping tool according to an embodiment. By rationally arranging the process route, the invention machines the waist-shaped groove and hole after rough machining, avoiding deformation that occurs after finishing the hole and groove during finishing. Simultaneously, a rationally designed turning fixture prevents clamping deformation, ensuring important dimensions and their geometric tolerances are met in a single clamping operation. A rationally designed drilling fixture is used to machine the circumferential pin hole in one operation on a CNC machining center, ensuring its dimensional and positional requirements. Finally, a part that meets the drawing requirements is machined. This method solves the technical problem in existing turbocharger bearing housing machining methods where the part is made of copper and has locally thin walls, making it prone to clamping deformation.

[0054] Please see Figures 5-9 , Figure 5 This is a schematic diagram of the rough machining of the large end and hole in the bearing housing machining method of the turbocharger of the present invention. Figure 6 This is a schematic diagram of the rough turning of the outer diameter of the small end and the inner hole in the bearing housing machining method of the turbocharger of the present invention. Figure 7 This is a schematic diagram of the precision machining of the large end face and inner hole in the bearing housing machining method of the turbocharger of the present invention. Figure 8 This is a schematic diagram showing the dimensions of the outer diameters, references A and B, and the inner bore end face of the large end in the machining method of the bearing housing of the turbocharger of the present invention. Figure 9 This is a schematic diagram of the machining of the bearing housing of the turbocharger of the present invention.

[0055] The present invention also provides a method for machining a bearing housing of a turbocharger, which is applied to the machining and clamping tool for the bearing housing of a turbocharger as described above.

[0056] Includes the following steps:

[0057] First, the workpiece undergoes heat treatment;

[0058] After heat treatment, the workpiece is rough-machined to remove excess material.

[0059] Then, mark the center crosshair and the position line of the waist-shaped groove on the workpiece after removing the excess material;

[0060] Use processing equipment to align and scribing the holes and oblong grooves on the end face;

[0061] The bearing seat drilling tool is used to fix the workpiece after the holes and waist-shaped grooves on the machined end face are completed, and the pin holes and waist-shaped grooves on the circumference are machined.

[0062] The bearing housing drill jig is used to fix the workpiece with the circumferential pin hole and waist groove completed by machining, and then countersinking is performed.

[0063] After the countersinking is completed, the workpiece is fixed using the bearing seat lathe tooling, and then the large end face and outer circle, and the small end face and outer circle are machined.

[0064] Finally, deburring is performed on the machined workpiece to obtain the bearing housing of the turbocharger.

[0065] The above description discloses only one preferred embodiment of the present invention, and should not be construed as limiting the scope of the present invention. Those skilled in the art will understand that all or part of the processes of the above embodiments can be implemented, and equivalent changes made in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A tool for machining and clamping a bearing housing of a turbocharger, characterized in that, This includes bearing housing drill jigs, bearing housing drilling fixtures, and bearing housing machining fixtures; The bearing housing drill jig is used to clamp the bearing housing of the turbocharger to machine the holes on the end face and mill the waist-shaped groove. The bearing housing drilling fixture is used to clamp the bearing housing of the turbocharger for machining the circumferential pin holes and waist-shaped grooves. The bearing housing tooling is used to clamp the bearing housing of the turbocharger for machining the large end face and outer circle, and the small end face and outer circle. The bearing housing drill jig includes a fixed jig body, a movable jig body, a first screw and a positioning pin. One end of the first screw passes through the movable jig body and is tightened onto the fixed jig body. The positioning pin is disposed on the movable jig body, and a drill sleeve is disposed on the fixed jig body. The bearing housing drilling fixture includes a main body, a pin, a second screw, and a first pressure plate. The main body is positioned by the outer circle and end face of the large end of the part and by the pin. The second screw is connected to the first pressure plate. The bearing housing tooling includes a body, a screw, a second pressure plate, and a clamping assembly. The clamping assembly is disposed on the body, and the screw cooperates with the second pressure plate to press the part on the small end face.

2. The bearing housing machining and clamping tool for a turbocharger as described in claim 1, characterized in that, The bearing housing drill jig also includes a washer, which is fitted onto the first screw and contacts the moving mold body.

3. The bearing housing machining and clamping tool for a turbocharger as described in claim 2, characterized in that, The number of drill bushings is multiple.

4. The bearing housing machining and clamping tool for a turbocharger as described in claim 3, characterized in that, The bearing housing tooling also includes a protective component, which is disposed on the clamping assembly.

5. A method for machining a bearing housing of a turbocharger, applied to the machining and clamping tool for the bearing housing of a turbocharger as described in claim 4, characterized in that, Includes the following steps: First, the workpiece undergoes heat treatment; After heat treatment, the workpiece is rough-machined to remove excess material. Then, mark the center crosshair and the position line of the waist-shaped groove on the workpiece after removing the excess material; Use processing equipment to align and scribing the holes and oblong grooves on the end face; The bearing seat drilling tool is used to fix the workpiece after the holes and waist-shaped grooves on the machined end face are completed, and the pin holes and waist-shaped grooves on the circumference are machined. The bearing housing drill jig is used to fix the workpiece with the circumferential pin hole and waist groove completed by machining, and then countersinking is performed. After the countersinking is completed, the workpiece is fixed using the bearing seat lathe tooling, and then the large end face and outer circle, and the small end face and outer circle are machined. Finally, deburring is performed on the machined workpiece to obtain the bearing housing of the turbocharger.

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