CN101985206A - Method for regulating turbulent flow generated by abrasive flow during precision finishing and device - Google Patents

Abstract

A turbulent flow control method and device for abrasive flow precision finishing, using the preparation of low-viscosity abrasive flow, changing the pressure and flow velocity of abrasive flow, designing and manufacturing uneven flow channels to form abrasive flow during precision machining Turbulent flow. The device includes an abrasive flow source device configured with a low-viscosity abrasive flow, the abrasive flow source device is provided with a pumping device, and the pumping device is connected with a pressure regulating device for changing the pressure and flow rate and A workbench device with an uneven flow path is provided, and the pressure regulating device and the workbench device are both connected with the abrasive particle flow source device. The invention has the beneficial effects of simple structure, convenient design and manufacture, and is conducive to the formation of turbulent flow in the microstructured flow channel.

Description

A turbulent flow control method and device for abrasive flow precision finishing

technical field

The invention relates to a turbulent flow control method and device for abrasive particle flow precision finishing.

Background technique

At present, the manufacturing industry has higher and higher requirements on the surface roughness of parts. However, it is difficult to use tools for contact finishing, such as polishing or grinding, for surfaces with small sizes or special geometries, whether it is automated or manual. , there is currently no effective solution to this problem. Abrasive grains are mixed with liquid to form a liquid-solid two-phase or multi-phase abrasive grain flow. The fluid properties of the abrasive grain flow determine that it can be changed, invisible and pervasive. Therefore, some surface finishing methods are formed based on the abrasive grain flow, such as extrusion Honing, abrasive water jet polishing, magnetorheological polishing, magnetic jet polishing, electrorheological fluid polishing, etc. These methods use the wall effect when the abrasive grain flow contacts the processed surface to form micro-cutting of the abrasive grain on the surface to achieve surface finishing. Since the abrasive grain flow can form a good profiling contact, it shows advantages in the processing of curved surfaces and special-shaped surfaces. . From the perspective of processing mechanism, both extrusion honing and abrasive water jet polishing belong to "hard" abrasive flow force processing. The so-called "hard" abrasive flow means that the abrasive flow has strong viscosity or strong impact force. Unlike "hard" abrasive flow, "soft" abrasive flow is a liquid-solid two-phase abrasive flow with weak or no viscosity, so it has better flow characteristics and can achieve turbulent flow, The effective processing of "soft" abrasive flow is carried out in the state of turbulent flow. It does not forcefully impact the processed surface in the form of jet flow, but uses the frequent action of micro-force and micro-cutting of abrasive particles to achieve gradual smoothing of the surface. Turbulent flow The randomness of the abrasive grain movement in the field realizes the disorder of the surface texture until the tool-less mirror-level processing of the structured surface is realized.

However, since the Reynolds number of the soft abrasive flow flowing in the narrow slits, narrow grooves, small holes and other geometrically shaped micro-flow channels of the parts is small, it is not easy to form turbulent flow, thus reducing the impact of the soft abrasive flow on the parts. Finishing effect of the processed surface.

Contents of the invention

The invention aims to solve the problem that the soft abrasive particle flow is not easy to form turbulent flow in the fine flow channel with special geometric shape, and provides a turbulent flow control method and device for the fine finishing process of the abrasive particle flow that is easy to form turbulent flow.

Technical scheme of the present invention:

A method for controlling turbulent flow in precision finishing of abrasive flow, which is characterized in that: the preparation of low-viscosity abrasive flow, changing the pressure and flow velocity of abrasive flow, and designing and manufacturing uneven flow channels make the abrasive flow create turbulent flow.

A device for realizing the turbulent flow control method of abrasive flow precision finishing according to the present invention, characterized in that it includes an abrasive flow source device configured with a low-viscosity abrasive flow, and the abrasive flow source device is provided with a pump The pumping device is connected with a pressure regulating device for changing the pressure and flow rate and a workbench device with uneven flow channels, and the pressure regulating device and the workbench device are connected with the abrasive flow source device connected.

Further, the abrasive flow source device includes a solution tank, the bottom of the solution tank is a truncated structure, and the solution tank is equipped with an abrasive flow, and the abrasive flow is formed by the emulsion and corundum (SiC) particles. The ratio of the volume ratio is 10:1; the solution tank is provided with an agitator to stir the concentration of the abrasive flow evenly, and the agitator includes a motor, a rotating shaft and a blade, and the blade is installed at the bottom of the solution tank; Both sides of the bottom of the solution tank are provided with wear debris absorbers for absorbing wear debris, and the wear debris absorbers include permanent magnets, stainless steel shells and end covers.

Further, the pumping device includes a filter, the filter is placed in the abrasive flow, and the filter is sequentially connected with a pump for delivering the abrasive flow, a pressure gauge for observing the pressure of the abrasive flow output by the pump, and preventing Non-return valve for the return flow of abrasive particles.

Further, the pressure regulating device has a pilot relief valve and a return pipe, and the pilot relief valve controls the pressure of the abrasive particle flow to form a turbulent flow.

Further, the workbench device includes a workbench, the surface of the workbench is flat, and a plurality of threaded holes and T-shaped slots for fixing fixtures and workpieces are provided on it;

The workpiece to be processed and a constraint module are installed on the workbench. The constraint module is designed and manufactured according to the shape of the workpiece to be processed. The surface of the constraint module that forms a flow channel with the workpiece to be processed is uneven. The workpiece and the constraint module are clamped and fixed on the workbench by the first fixture;

The two ends of the workpiece to be processed and the constraint module are provided with import and export blocks for the flow of abrasive grains in and out. The end faces of the import and export blocks have threaded holes and are connected with pipe joints. The pipeline is connected, the outlet block is connected to the input pipeline of the abrasive flow source device, and the inlet and outlet blocks are clamped and fixed on both ends of the processed workpiece and the constraint module by a second clamp;

The first clamp and the second clamp are combined by a bolt pressing plate device.

Technical idea of the present invention: the abrasive flow is prepared by emulsified liquid and corundum (SiC) particles according to the volume ratio of 10:1 to ensure that the abrasive flow has good fluidity and low viscosity; because the viscosity ratio of the emulsified liquid The water is larger and smaller than 45# engine oil, with good fluidity. The corundum (SiC) particles are selected to have a particle size of 1-5um, which is beneficial to obtain a higher quality of surface finishing. The bottom of the frustum-shaped structure of the solution tank is convenient to cooperate with the blades of the agitator. When the blades of the agitator rotate, the solution with high concentration at the bottom flows upward and outward, which is beneficial to make the concentration of the abrasive flow uniform in a short time.

The pore size of the filter screen is 10um, and solid matter larger than 10um is not allowed to pass through, so as not to damage the pump valve. The flow rate of the pump is 3.5m ³ /h, the head is 32m, and the power is 1.5KW, so as to ensure the required flow rate and pressure during the precision finishing of the abrasive flow.

The abrasive particle flow output by the pump is divided into two paths, one leads to the flow path composed of the workpiece to be processed and the restraint module, which is used to perform precision finishing on the surface of the workpiece to be processed; the other path passes through the pilot overflow valve and the return pipe Return to solution tank. There is no pressure in the pipeline at the output end of the pump, the pilot relief valve is closed, and the pressure of the abrasive flow in the pipeline at the output end of the pump reaches the opening pressure of the pilot relief valve, the circuit will be formed in this circuit. Once the circuit is formed in the circuit , because a large amount of abrasive particles flow quickly back to the solution tank, the pressure in the pipeline at the pump outlet drops. When the pressure drops below the opening pressure of the pilot relief valve, the relief valve closes, and The pressure of the abrasive particle flow in the pipeline at the output end of the pump is constantly changing, and the pressure change will also lead to a change in the flow rate, which is conducive to the formation of turbulent flow.

The surface of the flow channel formed by the constraint module and the processed workpiece is designed and manufactured in an uneven structural shape, so that the abrasive grain flow is more likely to form a turbulent flow when flowing through the flow channel.

The invention has the beneficial effects of simple structure, convenient design and manufacture, and is conducive to the formation of turbulent flow in the microstructured flow channel.

Description of drawings

Figure 1 is a schematic diagram of the regulation method of the present invention.

Fig. 2 is a structural schematic diagram of the regulating device of the present invention.

Fig. 3 is a structural diagram of the solution tank of the present invention.

Fig. 4 is a half-sectional schematic diagram of the solution tank of the present invention.

Fig. 5 is a structural view of the shaft and blades of the stirrer of the present invention.

Fig. 6 is a structural diagram of the abrasive debris adsorber of the present invention.

Fig. 7 is a cross-sectional view of the wear debris adsorber of the present invention along the line A-A in Fig. 6 .

Fig. 8 is an assembly diagram of the workbench device of the present invention.

Fig. 9 is an assembly diagram of the workbench, the workpiece to be processed, the constraint module and the import and export blocks of the present invention.

Fig. 10 is a part diagram of the workbench of the present invention.

Fig. 11 is a part diagram of the processed workpiece according to the present invention.

Fig. 12 is a part diagram of the constraint module of the present invention.

Fig. 13 is a part diagram of the import and export block of the present invention.

Detailed ways

Referring to Figure 1-13, a turbulent flow control method for precision finishing of abrasive grain flow, adopts the preparation of low-viscosity abrasive grain flow, changes the pressure and flow velocity of abrasive grain flow, and designs and manufactures uneven flow channels to make abrasive grain flow flow in precision Creates turbulent flow during processing.

A device for realizing the turbulent flow control method for precision finishing of abrasive grain flow according to the present invention, comprising an abrasive grain flow source device configured with a low-viscosity abrasive grain flow, the abrasive grain flow source device is provided with a pumping device, the The pumping device is connected with a pressure regulating device for changing the pressure and flow rate and a worktable device with uneven flow channels, and the pressure regulating device and the workbench device are both connected with the abrasive particle flow source device.

The abrasive flow source device includes a solution box 2, the bottom of which is a truncated cone structure, and the solution box 2 is equipped with an abrasive flow 1, and the abrasive flow 1 is composed of an emulsion and corundum (SiC ) particles are prepared according to the volume ratio of 10:1; the solution tank 2 is provided with an agitator 4 for uniformly stirring the concentration of the abrasive flow 1, and the agitator 4 includes a motor, a rotating shaft and a blade, and the blade is installed At the bottom of the solution tank 2 ; both sides of the bottom of the solution tank 2 are provided with a wear debris absorber 3 for absorbing debris, and the wear debris absorber 3 includes a permanent magnet 302 , a stainless steel shell 301 and an end cover 303 .

The pumping device includes a filter 5, the filter 5 is placed in the abrasive flow 1, the filter 5 is sequentially connected with a pump 6 for delivering the abrasive flow 1, and observing the abrasive flow 1 output by the pump 6. Pressure gauge 7 and non-return valve 8 to prevent backflow of abrasive particle flow 1.

The pressure regulating device has a pilot overflow valve 9 and a return pipe 10, and the pilot overflow valve 9 controls the pressure of the abrasive particle flow 1 to form a turbulent flow.

The workbench device includes a workbench 11, the surface of the workbench 11 is smooth, and a plurality of threaded holes and T-shaped slots for fixing fixtures and workpieces are provided on it;

The workpiece 13 to be processed and the constraint module 14 are installed on the workbench 11. The constraint module 14 is designed and manufactured according to the shape of the workpiece 13 to be processed. uneven, the workpiece 13 to be processed and the constraint module 14 are clamped and fixed on the workbench 11 by the first clamp 1602;

The two ends of the processed workpiece 13 and the constraint module 14 are provided with import and export blocks 12, 15 through which abrasive particles flow in and out, and the end faces of the import and export blocks 12, 15 have threaded holes connected with pipe joints. The introduction block 12 is connected to the output pipeline of the pumping device, the export block 15 is connected to the input pipeline of the abrasive flow source device, and the introduction and export blocks 12, 15 are clamped and fixed on the Processing the two ends of the workpiece 13 and the constraint module 14;

The first clamp 1602 and the second clamp 1601 are combined by a bolt clamping device.

Technical idea of the present invention: the abrasive grain flow 1 is prepared by the emulsion and corundum (SiC) particles according to the volume ratio of 10:1 to ensure that the abrasive grain flow 1 has good fluidity and low viscosity; because the emulsion Viscosity is higher than water and smaller than 45# engine oil, and fluidity is good. The corundum (SiC) particles are selected to have a particle size of 1-5um, which is beneficial to obtain a higher quality of surface finishing. The bottom of the frustum-shaped structure of the solution tank 2 is convenient to cooperate with the blades of the agitator 4 . When the blades of the agitator 4 rotate, the solution with high concentration at the bottom flows upward and outward, which is beneficial to make the concentration of the abrasive grain flow 1 uniform in a short time.

The pore diameter of the filter 5 is 10um, and solid matter larger than 10um is not allowed to pass through, so as not to damage the valve of the pump 6 . The flow rate of the pump 6 is 3.5m ³ /h, the head is 32m, and the power is 1.5KW, so as to ensure the flow rate and pressure required for the precision finishing of the abrasive flow 1 .

The abrasive particle flow 1 output by the pump 6 is divided into two paths, one path leads to the flow path formed by the workpiece 13 and the restraint module 14, and is used for precise finishing of the surface of the workpiece 13 to be processed; the other path passes through the pilot overflow The flow valve 9 and the return line 10 flow back into the solution tank 2 . There is no pressure in the pipeline at the output end of the pump 6, and the pilot relief valve 9 is closed. When the pressure of the abrasive particle flow 1 in the pipeline at the output end of the pump 6 reaches the opening pressure of the pilot relief valve 9, the circuit will form in this circuit. Once the road forms a circuit, since a large amount of abrasive grain flow 1 quickly flows back to the solution tank 2, the pressure in the pipeline at the output end of the pump 6 drops. When the pressure drops below the opening pressure of the pilot relief valve 9, the overflow The valve 9 is closed, and the pressure of the abrasive particle flow 1 in the pipeline at the output end of the pump 6 changes continuously through the on-off of the overflow valve 9, and the pressure change will also lead to a change in the flow rate, which is conducive to the formation of turbulent flow.

The surface of the flow channel formed by the constraint module 14 and the processed workpiece 13 is designed and manufactured in an uneven structural shape, so that the abrasive particle flow 1 is more likely to form a turbulent flow when flowing through the flow channel.

The content described in the embodiments of this specification is only an enumeration of the implementation forms of the inventive concept. The protection scope of the present invention should not be regarded as limited to the specific forms stated in the embodiments. The protection scope of the present invention also extends to the field Equivalent technical means that the skilled person can think of based on the concept of the present invention.

Claims (6)

1. an abrasive Flow precise finishing processing turbulent flow regulate and control method is characterized in that: adopt the low viscous abrasive Flow of preparation, change abrasive Flow pressure and the rough runner of flow velocity, design and manufacturing to make abrasive Flow form turbulent flow when Precision Machining.

2. device of realizing the described abrasive Flow precise finishing of claim 1 processing turbulent flow regulate and control method, it is characterized in that: the abrasive Flow source apparatus that comprises configuration low viscosity abrasive Flow, described abrasive Flow source apparatus is provided with pumping installations, be connected with pressure controlling device that changes pressure and flow velocity and the table device that is provided with rough runner on the described pumping installations, described pressure controlling device all links to each other with described abrasive Flow source apparatus with table device.

3. a kind of device of realizing abrasive Flow precise finishing processing turbulent flow regulate and control method according to claim 2, it is characterized in that: described abrasive Flow source apparatus comprises liquor box, the bottom of described liquor box is the circular platform type structure, in the described liquor box abrasive Flow is housed, described abrasive Flow is prepared according to 10: 1 ratio of volume ratio by emulsion and diamond dust (SiC) particle; Described liquor box is provided with the agitator that abrasive Flow concentration is stirred, and described agitator includes motor, rotating shaft and blade, and described blade is installed in the bottom of liquor box; The two bottom sides of described liquor box is provided with the abrasive dust absorber of absorption abrasive dust, and described abrasive dust absorber includes permanent magnet, stainless steel casing and end cap.

4. according to claim 2 or 3 described a kind of devices of realizing abrasive Flow precise finishing processing turbulent flow regulate and control method, it is characterized in that: described pumping installations comprises filter, described filter is placed in the abrasive Flow, the Pressure gauge of the abrasive Flow pressure of be connected with the pump of carrying abrasive Flow on the described filter in turn, observing pump output and prevent the check valve that abrasive Flow refluxes.

5. a kind of device of realizing abrasive Flow precise finishing processing turbulent flow regulate and control method according to claim 4, it is characterized in that: described pressure controlling device has pilot operated compound relief valve and reflux line, described pilot operated compound relief valve is controlled the pressure of described abrasive Flow, makes it form turbulent flow.

6. a kind of device of realizing abrasive Flow precise finishing processing turbulent flow regulate and control method according to claim 5, it is characterized in that: described table device includes workbench, described workbench surface is smooth, which is provided with the screwed hole and the T-slot of a plurality of stationary fixtures and workpiece;

Workpiece to be machined, constraints module are installed on the described workbench, described constraints module designs and makes according to the shape of workpiece to be machined, form the surface irregularity of runner on the described constraints module with workpiece to be machined, described workpiece to be machined, constraints module are fixed on the workbench by the first anchor clamps clamping;

The two ends of described workpiece to be machined, constraints module are provided with the piece that imports and exports that abrasive Flow flows to outflow, the described end face that imports and exports piece has screwed hole, be connected with pipe joint, described importing piece links to each other with the output pipe of pumping installations, described derivation block links to each other with the intake line of abrasive Flow source apparatus, describedly imports and exports piece is fixed on described workpiece to be machined, constraints module by the second anchor clamps clamping two ends;

Described first anchor clamps and second anchor clamps are combined by the bolt clip plate device.

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