A precision abrasive flow machining device for the inner surface of a turbine housing

Abstract

A precision abrasive flow machining device for the inner surface of a turbine housing comprises a workpiece machining section, a workpiece sealing section, an abrasive flow fluid supply section, an abrasive flow waste fluid collection section, and a worktable. Its features include: the workpiece machining section mounted on the worktable; a rotary clamping cylinder mounted on the workpiece machining section; a positioning pin mounted on a support plate; a push-button switch mounted on the worktable; an abrasive cylinder mounted on the worktable; a clamping cylinder mounted on the worktable via a bracket; and a motor and a hydraulic cylinder mounted on the worktable. The advantages of this invention are: by using a motor to drive a hydraulic pump, the flow rate can be controlled under the same output power conditions. This invention effectively overcomes the problem of cumbersome and labor-intensive clamping in current precision abrasive flow machining of the inner surface of turbine housings. By utilizing cylinder clamping and sealing, and through hydraulic cylinder compression, the abrasive flows through pipes onto the inner surface of the turbine housing, thereby performing cyclic polishing of the inner surface of the turbine housing.

Description

Technical Field

[0001] This invention relates to the field of abrasive flow machining technology, specifically to an abrasive flow precision machining device for the inner surface of a turbine housing. Background Technology

[0002] Turbochargers are widely used in aerospace, automotive, and military industries. The quality of the inner surface of the turbine casing, a crucial component, directly affects the performance of the entire component or machine. Due to the irregular shape and complex structure of the turbine casing's inner surface, traditional machining processes struggle to achieve a smooth finish. Extensive research has demonstrated that abrasive flow machining technology can significantly improve the inner surface quality of turbine casings. This invention focuses on turbine casings and researches abrasive flow precision polishing equipment for turbine casings. The turbine casing is a vital component of a turbocharger, directly impacting the performance of the entire system. Turbo casings are characterized by high temperature resistance, low surface roughness, rounded corners in their internal curved structure, burr-free internal ducts, and a smooth surface. Considering the curved structure of the turbine casing's inner surface, deburring and rounding corners using traditional machining methods is extremely difficult. Abrasive flow machining technology provides an effective solution to this problem.

[0003] The biggest difference between abrasive flow polishing and conventional cutting is the random distribution of the shape, size, and arrangement of the abrasive particles in the polishing fluid. The way a single abrasive particle contacts the workpiece is also random. If we consider a single abrasive particle as a small cutting tool, the rake angle of the cutting part could be positive, zero, or negative, and the angles of other cutting parts are also randomly distributed. During abrasive flow polishing, the abrasive particles in the polishing fluid interact with the workpiece surface under the pressure and flow rate. The cutting action is generated depending on the pressure of the abrasive flow polishing. If the pressure is too low, the abrasive particles only contact the workpiece, resulting in elastic deformation that cannot be removed. If the abrasive particles act on the workpiece surface with greater force and a larger rake angle, causing the protruding parts of the workpiece to reach the material's fracture limit, the micro-protrusions will be removed, forming chips that are carried away by the polishing fluid, effectively improving the workpiece surface quality. Summary of the Invention

[0004] To address the aforementioned shortcomings, this invention provides an abrasive flow precision machining device for the inner surface of a turbine housing. A workpiece is mounted on a support platform, its position determined by locating pins and clamped by a rotary clamping cylinder. Both sides are sealed by sealing cylinders. The support platform has pre-drilled openings to facilitate the inflow of abrasive flow machining fluid. The sealing cylinders are connected to sealing blocks with a channel in the center to allow the abrasive flow machining fluid to flow out. Through the abrasive flow machining fluid's thorough contact and friction on the inner surface of the turbine housing, the machining effect on the inner surface of the turbine housing is significantly improved.

[0005] This invention is achieved through the following technical solution: a precision machining device for abrasive flow on the inner surface of a turbine housing, characterized in that the device comprises a workpiece machining section, a workpiece sealing section, an abrasive flow liquid supply section, an abrasive flow waste liquid collection section, and a worktable. The workpiece machining section comprises a support column, a support plate, a rotary clamping cylinder I, a rotary clamping cylinder II, a proximity sensor, a washer, a feed pipe connector, a positioning pin, a clamp, and a cylinder clamping block. The workpiece sealing section comprises a cylinder connecting plate I, a cylinder connecting plate II, a linear cylinder I, a linear cylinder II, a cylinder sealing block I, a cylinder sealing block II, a sealing gasket I, a sealing gasket II, and a discharge pipe. The system comprises connector 1, discharge pipe connector 2, hose 1, hose 2, clamp 1, and clamp 2. The abrasive flow liquid supply section consists of an abrasive flow liquid supply tank, a motor unit, a coupling, a hydraulic pump, pipe 1, and pipe 2. The abrasive flow waste liquid collection section consists of an abrasive flow waste liquid collection tank, pipe 3, a recovery flexible pipe, and a waste liquid collection box. The support plate has threaded holes, and the rotary clamping cylinder is fixed to the support plate by threads. The mounting platform has threaded holes, and the start button, abrasive flow liquid supply tank, hydraulic pump, motor, and abrasive flow waste liquid collection tank are installed and fixed to the worktable through the threaded holes on the plate. The workpiece processing section is fixed to the worktable by threads.

[0006] Furthermore, as a preferred embodiment, the workpiece processing section comprises a support column, a support plate, a rotary clamping cylinder one, a rotary clamping cylinder two, a proximity sensor, a washer, a feed pipe connector, a positioning pin, a cylinder nylon clamping block one, and a cylinder nylon clamping block two. The support plate is fixed to the four support columns through threaded holes, the support columns are fixed to the worktable through threaded holes, the proximity sensor is fixed to the support plate through threaded holes, the rotary clamping cylinder one and the rotary clamping cylinder two are fixed to the support plate through threaded holes, the cylinder nylon clamping block one and the cylinder nylon clamping block two are respectively fixed to the rotary clamping cylinder one and the rotary clamping cylinder two through threaded holes, the fixing pin is interference-fitted with the hole processed on the support plate and fixed through the threaded hole, and the feed pipe connector clamping washer is fixed to the support plate through the threaded hole. The workpiece is positioned on the support plate by the positioning pin. The proximity sensor detects the presence of the workpiece, and the rotary clamping cylinder clamps the workpiece on the support plate by rotating it to the right. The support plate has a reserved abrasive inlet to facilitate the entry of abrasive, reduce the time of manual clamping, reduce scratches on the workpiece surface caused by manual clamping, and improve processing efficiency.

[0007] Furthermore, as a preferred embodiment, the workpiece sealing portion comprises a cylinder connecting plate 1, a cylinder connecting plate 2, a linear cylinder 1, a linear cylinder 2, a cylinder sealing block 1, a cylinder sealing block 2, a sealing gasket 1, a sealing gasket 2, a discharge pipe connector 1, a discharge pipe connector 2, a hose 1, and a hose 2. Cylinder connecting plate 1 and cylinder connecting plate 2 are respectively fixed to the worktable via threaded holes. Linear cylinder 1 and linear cylinder 2 are respectively fixed to cylinder connecting plate 1 and cylinder connecting plate 2 via threaded holes. Cylinder sealing block 1 and cylinder sealing block 2 are respectively fixed to linear cylinder 1 and linear cylinder 2 via threaded holes. Sealing gasket 1 and sealing gasket 2 are respectively fixed to cylinder sealing block 1 and cylinder sealing block 2 via threaded holes. An interference fit is fitted onto the cylinder sealing block. Discharge pipe connector one and discharge pipe connector two are fixed to cylinder sealing block one and cylinder sealing block two respectively through threaded holes. Flexible hose one and flexible hose two are tightly fitted onto discharge pipe connector one and discharge pipe connector two with clamps. After the workpiece is installed in place, the sealing cylinder extends, sealing the through holes on both sides of the workpiece. The abrasive enters the workpiece through the pre-drilled holes in the support plate, then flows through the sealing block and out through the flexible hose. Through the above installation and fitting, the inside of the workpiece can be fully enclosed, allowing the abrasive fluid to completely pass through the inner surface of the workpiece for thorough grinding. This results in high working efficiency. The sealing part uses a rubber gasket, which is less likely to scratch the workpiece and is easy to replace.

[0008] Furthermore, as a preferred embodiment, the abrasive flow fluid supply section comprises an abrasive flow fluid supply tank, a motor unit, a hydraulic pump, and a first pipeline. The abrasive flow fluid supply tank is fixed to the worktable via a threaded hole, the motor unit is fixed to the worktable via a threaded hole, and the hydraulic pump is fixed to the worktable via a threaded hole. The motor unit and the hydraulic pump are connected via a coupling. This hydraulic pump is driven by an electric motor, thus being an electric hydraulic pump. It has good flow performance, the output flow can be adjusted as needed, the movement is smooth, the noise is low, and the working efficiency and volumetric efficiency are high. The abrasive flow fluid supply tank and the hydraulic pump are connected via a clamp through the first pipeline, and the hydraulic pump is connected to the feed pipe connector via a second pipeline. This fluid supply device has a simple structure, stable power output, good economy, and high working efficiency.

[0009] Furthermore, as a preferred embodiment, the abrasive flow waste liquid collection section comprises an abrasive flow waste liquid collection tank, a recovery flexible pipe, and a waste liquid collection box. The abrasive flow waste liquid collection tank is fixed to the workbench by threads, and the waste liquid collection box is also fixed to the workbench by threads. Flexible pipe one and flexible pipe two are connected to discharge pipe connector one and discharge pipe connector two by clamps and are connected to the waste liquid collection box. The waste liquid collection box and the waste liquid collection tank are connected by pipe three. This device has a simple structure for collecting waste liquid, can effectively control the waste liquid flow rate, is economical, and has high working efficiency.

[0010] Furthermore, as a preferred embodiment, the workbench is welded together from two parts, upper and lower. The workbench is threaded, and the workpiece processing part, cylinder connecting plate, motor device, hydraulic pump, and abrasive flow supply tank are installed and fixed to the workbench through threaded holes. All devices installed on this mounting platform are fixed by threaded connection. This fixing method is a detachable fixing connection, with a simple structure, easy and reliable connection, convenient disassembly and assembly, simple operation, material saving, and good economy. This fixing method is stable and reliable. Attached Figure Description

[0011] Figure 1 A schematic diagram of the overall structure of the abrasive flow precision machining device for the inner surface of the turbine housing.

[0012] Figure 2 Top view of an abrasive flow precision machining apparatus for the inner surface of a turbine housing.

[0013] Figure 3 Schematic diagram of the workpiece machining section

[0014] Figure 4 Sectional view of the machined part of the workpiece

[0015] Figure 5 Schematic diagram of the sealing part of the workpiece

[0016] Figure 6 Schematic diagram of the cross section of the sealing block

[0017] Figure 7 Schematic diagram of cylinder support for sealing

[0018] In the diagram: 1—Workbench; 2—Abrasive flow supply tank; 3—Hydraulic pump; 4—Workpiece machining section; 401—Support plate; 402—Nylon clamping block one for cylinders; 403—Positioning pin one; 404—Nylon clamping block two for cylinders; 405—Support column; 406—Proximity sensor; 407—Rotary clamping cylinder two; 408—Positioning pin two; 409—Feed pipe connector; 410—Rotary clamping cylinder one; 411—Washer; 412—Clamp; 5—Workpiece sealing section one; 501—Cylinder connecting plate one; 502—Linear cylinder one; 50 3—Cylinder plugging block one; 504—Plugging gasket one; 505—Discharge pipe connector one; 506—Clamp one; 6—Workpiece plugging part two; 601—Cylinder connecting plate two; 602—Linear cylinder two; 603—Cylinder plugging block two; 604—Plugging gasket two; 605—Discharge pipe connector two; 606—Clamp two; 7—Pipe two; 801—Hose one; 802—Hose two; 9—Waste liquid collection box; 10—Motor; 11—Pipe three; 12—Start button; 13—Waste liquid collection tank; 14—Pipe one; 15—Coupling. Detailed Implementation

[0019] This invention provides an abrasive flow precision machining apparatus for the inner surface of a turbine housing. To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention. Other embodiments obtained by those skilled in the art without inventive effort are all within the protection scope of this invention.

[0020] This invention mainly consists of five parts: a workpiece processing section, a workpiece sealing section, an abrasive flow fluid supply section, an abrasive flow waste liquid collection section, and a worktable. The specific installation steps are as follows: [Worktable, workpiece processing section, workpiece sealing section, abrasive flow fluid supply section, abrasive flow waste liquid collection section]. The specific installation is carried out according to the following steps:

[0021] Step 1: Install the workbench. The workbench (1) is provided with threaded holes and reserved openings, in which the abrasive flow supply tank (2), motor device (10), hydraulic pump (3), workpiece processing part (4), workpiece sealing part one (5), workpiece sealing part two (6), waste liquid collection box (9), waste liquid collection tank (13), and start button (12) are fixed by bolts through the threaded holes on the workbench, thereby realizing the installation of the installation table.

[0022] Step 2: Install the workpiece processing part. The workpiece processing part (4) is composed of a support plate (401): cylinder nylon clamping block one (402): positioning pin one (403): cylinder nylon clamping block two (404): support column (405): proximity sensor (406): rotary clamping cylinder two (407): positioning pin two (408): feed pipe connector (409): rotary clamping cylinder one (410): washer (411): clamp (412). First, connect the support plate (401) to the four support columns (405) with bolts. The four support columns (405) are connected to the worktable (1) with bolts. Rotary clamping cylinder one (410) The first and second rotary clamping cylinders (407) are bolted to the support plate (401). The first cylinder nylon clamping block (402) and the second cylinder nylon clamping block (404) are bolted to the first rotary clamping cylinder (410) and the second rotary clamping cylinder (407). The first positioning pin (403) and the second positioning pin (408) are bolted to the support plate (401). The proximity sensor (406) is threaded onto the support plate (401). The feed pipe connector (409) is bolted to the support plate (401) via a clamping washer (411). The installation of the workpiece processing part is completed through the above installation.

[0023] Step 3: Install the workpiece sealing part. The workpiece sealing part (5) consists of cylinder connecting plate 1 (501): linear cylinder 1 (502): cylinder sealing block 1 (503): sealing gasket 1 (504): discharge pipe connector 1 (505): clamp 1 (506). First, cylinder connecting plate 1 (501) is installed and fixed to the pre-reserved threaded hole on the workbench (1) by bolts. Linear cylinder 1 (502) is fixed to cylinder connecting plate 1 (501) by bolts. Cylinder sealing block 1 (503) is connected to the linear cylinder by its own thread. Tighten and fix 1 (502), and fit the sealing gasket 1 (504) onto the cylinder sealing block 1 (503) with an interference fit. Connect the discharge pipe connector 1 (505) to the cylinder sealing block 1 (503) with bolts. Clamp 1 (506) clamps the hose (8) to the discharge pipe connector 1 (505). The above installation process completes the installation of the workpiece sealing part (5). The installation of the workpiece sealing part (6) is the same as the installation of the workpiece sealing part (5). Therefore, the above process completes the installation of the workpiece sealing part.

[0024] Step 4: The abrasive flow waste liquid collection section consists of hose 1 (801), hose 2 (802), waste liquid collection box (9), pipe 3 (11), and waste liquid collection tank (13). First, hose 1 (801) and hose 2 (802) are connected to waste liquid collection box (9), and waste liquid collection box (9) and waste liquid collection tank (13) are connected through pipe 3 (11). The installation of the abrasive flow waste liquid collection section is completed according to the above operation.

[0025] Step 5: Install the abrasive flow liquid supply section. The abrasive flow liquid supply section consists of an abrasive flow liquid supply tank (2), a hydraulic pump (3), pipe two (7), a motor (10), pipe one (14), and a coupling (15). First, the abrasive flow liquid supply tank (2) and the hydraulic pump (3) are connected through pipe one (14), the motor (10) and the hydraulic pump (3) are connected through the coupling (15), and the hydraulic pump (3) is connected to the feed pipe connector (409) through a clamp (412). Following the above steps, complete the installation of the abrasive flow waste liquid supply section.

[0026] When this device is in operation, place it vertically and follow these steps:

[0027] Step 1: Place the turbine housing stably with positioning pin 1 (403) and positioning pin 2 (408), and remove both hands from the workpiece processing part (4). At this time, the proximity sensor (406) detects that the workpiece is in the processing position. The operator presses the start button (12) and the worktable starts working.

[0028] Step 2: First, the rotary clamping cylinder 1 (410) and the rotary clamping cylinder 2 (407) fix the workpiece on the support plate (401) by rotary clamping. The workpiece blocking part (5) and the workpiece blocking part (6) are extended by the linear cylinder 1 (502) and the linear cylinder 2 (602) respectively to block both ends of the workpiece.

[0029] Step 3: After the cylinder reaches its position, the abrasive flow supply section begins operation. The motor (10) drives the hydraulic pump (3) to deliver the abrasive. The abrasive is delivered from the hydraulic pump (3), passes through pipe two (7) to the inlet pipe joint (409), and then reaches the inside of the workpiece. Inside the workpiece, it flows through compression, towards the outlet cylinder sealing block one (503) and cylinder sealing block one (603), then through hose one (801) and hose two (802) to the waste liquid collection box (9), and finally flows back to the waste liquid collection tank (13) through pipe three (11). The workpiece is then removed, and the inner surface of the turbine volute is machined.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An abrasive flow precision machining apparatus for the inner surface of a turbine housing, characterized by, The utility model provides a kind of device for the processing of workpiece, and the device is composed of workpiece processing part, workpiece blocking part, abrasive flow liquid supply part, abrasive flow waste liquid collection part and workbench.The workpiece processing part is composed of support column, support plate, rotary clamping cylinder one, rotary clamping cylinder two, proximity sensor, gasket, inlet pipe joint, positioning pin, cylinder clamping block.The workpiece blocking part is composed of cylinder connecting plate one, cylinder connecting plate two, linear cylinder one, linear cylinder two, cylinder blocking block one, cylinder blocking block two, blocking rubber pad one, blocking rubber pad two, outlet pipe joint one, outlet pipe joint two, clamp one, clamp two, hose one and hose two.The abrasive flow liquid supply part is composed of abrasive flow liquid supply tank, motor device, coupling, hydraulic pump, pipeline one and pipeline two.The abrasive flow waste liquid collection part is composed of abrasive flow waste liquid collection tank, pipeline three, recovery hose and waste liquid collection box.The support plate is provided with threaded hole, and rotary clamping cylinder is fixed with support plate through thread.The workbench is provided with threaded hole, and start button, abrasive flow liquid supply tank, hydraulic pump, motor and abrasive flow waste liquid collection tank are fixed with workbench through threaded hole of plate.The workpiece processing part is fixed with workbench through thread.The workpiece processing part is composed of support column, support plate, rotary clamping cylinder one, rotary clamping cylinder two, proximity sensor, gasket, inlet pipe joint, positioning pin, cylinder nylon clamping block one and cylinder nylon clamping block two.Support plate is fixed with four support columns through threaded hole.Support column is fixed on workbench through threaded hole.Proximity sensor is fixed on support plate through threaded hole.Rotary clamping cylinder one and rotary clamping cylinder two are fixed with support plate through threaded hole.Cylinder nylon clamping block one and cylinder nylon clamping block two are respectively fixed with rotary clamping cylinder one and rotary clamping cylinder two through threaded hole.Fixed pin is interference fit with hole on support plate and is fixed through threaded hole.Inlet pipe joint is fixed with support plate through threaded hole.Workpiece is positioned on support plate through positioning pin.Proximity sensor detects the presence of workpiece.Rotary clamping cylinder fixes workpiece on support plate through right clamping.The workpiece blocking part is composed of cylinder connecting plate one, cylinder connecting plate two, linear cylinder one, linear cylinder two, cylinder blocking block one, cylinder blocking block two, blocking rubber pad one, blocking rubber pad two, outlet pipe joint one, outlet pipe joint two, hose one and hose two.Cylinder connecting plate one and cylinder connecting plate two are respectively fixed with workbench through threaded hole.Linear cylinder one and linear cylinder two are respectively fixed with cylinder connecting plate one and cylinder connecting plate two through threaded hole.Cylinder blocking block one and cylinder blocking block two are respectively fixed with linear cylinder one and linear cylinder two through threaded hole.Blocking rubber pad one and blocking rubber pad two are respectively interference fit on cylinder blocking block one and cylinder blocking block two through threaded hole.Outlet pipe joint one and outlet pipe joint two are respectively fixed with cylinder blocking block one and cylinder blocking block two through threaded hole.Two side hoses are sleeved on outlet pipe joint one and outlet pipe joint two through clamp.After workpiece is installed in place, blocking cylinder is extended to seal the through hole of workpiece.The abrasive enters the workpiece through the reserved hole of the support plate, and then flows out through the plugging block and the hose.

2. An abrasive flow precision machining apparatus for the inner surface of a turbine housing according to claim 1, characterized in that: The abrasive particle flow liquid supply part is composed of an abrasive particle flow liquid supply tank, a motor device, a hydraulic pump, and a pipeline. The abrasive particle flow liquid supply tank is fixed to the workbench through threaded holes. The motor device is fixed to the workbench through threaded holes. The hydraulic pump is fixed to the workbench through threaded holes. The motor device is connected to the hydraulic pump through a shaft coupling. The hydraulic pump is driven by the motor, i.e. an electric hydraulic pump. The flow performance is good. The output flow can be adjusted according to the needs. The abrasive particle flow liquid supply tank is connected to the hydraulic pump through the pipeline. The hydraulic pump is connected to the inlet pipe joint through the pipeline.

3. An abrasive flow precision machining apparatus for the inner surface of a turbine housing according to claim 1, wherein: The abrasive particle flow waste liquid collection part is composed of an abrasive particle flow waste liquid collection tank, a recovery hose pipeline, and a waste liquid collection box. The abrasive particle flow waste liquid collection tank is fixed to the workbench through threads. The waste liquid collection box is fixed to the workbench through threads. The outlet pipe joint one and the outlet pipe joint two are connected to the waste liquid collection box through the hoses on both sides. The waste liquid collection box is connected to the waste liquid collection tank through the pipeline three.

4. An abrasive flow precision machining apparatus for the interior surface of a turbine housing shell as defined in claim 1 wherein: The workbench is composed of two parts welded together. The workbench is provided with threads. The workpiece machining part, the cylinder connecting plate, the motor device, the hydraulic pump, and the abrasive particle flow liquid supply tank are fixed to the workbench through threaded holes. The devices installed on the workbench are fixed in a threaded connection mode.

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