A kind of abrasive grain flow polishing special fluid abrasive machining performance detection device and method

Abstract

The application discloses a kind of abrasive flow lapping special fluid abrasive machining performance detection device and method, device includes fixture and sample;Clamp is placed on machine tool workbench, fixture clamps sample, sample is the cylinder with variable cross-section inner hole, lower abrasive cylinder is fixedly connected to the lower surface of machine tool workbench, fluid abrasive is loaded in lower abrasive cylinder, abrasive cylinder piston is built in lower abrasive cylinder, abrasive cylinder piston is connected with machine tool, machine tool can control abrasive cylinder piston and extrude fluid abrasive in lower abrasive cylinder and flow through the inner hole of sample.Based on the device of the application, abrasive flow lapping test based on brand-new fluid abrasive and old fluid abrasive is carried out under the condition of same pressure and fluid abrasive dosage, the time of two tests and the mass change of sample before and after test are obtained, and then fluid abrasive flow performance index and cutting performance index can be calculated.The application has low cost, simple operation and high reliability, can be directly used in production site, and quantitatively evaluates the cutting performance of fluid abrasive.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of fluid abrasives, and particularly relates to a fluid abrasive processing performance detection device and method special for abrasive flow finishing. BACKGROUND

[0002] The fluid abrasive is a solid-liquid two-phase mixture uniformly mixed by liquid polymer material, hard particles and lubricant additives. The fluid abrasive is widely used in precision and ultra-precision machining of rough surfaces due to good machining accessibility, wide material adaptability and high machining surface quality.

[0003] The abrasive flow finishing is a special machining technology for improving the machining surface quality by extruding the fluid abrasive on the workpiece surface. In the abrasive flow finishing, the processing performance of the brand-new fluid abrasive, such as the flowability and the cutting performance, will change after a period of use, which is manifested as the flowability and the cutting performance being deteriorated, and the finishing efficiency and the machining surface quality being changed, which is an important reason affecting the product quality stability in mass production. Therefore, the processing performance detection technology of the fluid abrasive gradually becomes one of the focuses in the field.

[0004] At present, the mainstream detection instrument for the rheological properties of the fluid abrasive is a viscometer and a rotary rheometer, but the detection instrument faces the problems of high detection cost, harsh detection conditions and inability to detect and characterize the cutting performance of the fluid abrasive, and thus is only suitable for laboratory and scientific research occasions and cannot meet the engineering application. Therefore, it is an urgent technical problem to be solved in the production field to seek a detection device and method which are simple and easy to operate, high in reliability and complete in functions. SUMMARY

[0005] The application aims to solve the technical problems of the prior art, and provides a fluid abrasive processing performance detection device and method special for abrasive flow finishing.

[0006] To achieve the above technical purpose, the application adopts the following technical scheme:

[0007] A fluid abrasive processing performance detection device special for abrasive flow finishing, comprising a clamp and two identical samples.

[0008] The clamp is placed on a workbench of an abrasive flow finishing machine, and the clamp is used for clamping the sample, and the sample is a cylinder with a variable cross-section inner hole.

[0009] A lower abrasive cylinder is fixed to the lower surface of the workbench, the lower abrasive cylinder is filled with the fluid abrasive, and the lower abrasive cylinder is provided with an abrasive cylinder piston, the abrasive cylinder piston is connected with the machine tool, and the machine tool can control the abrasive cylinder piston to extrude the fluid abrasive in the lower abrasive cylinder to flow through the inner hole of the sample.

[0010] To optimize the above technical solutions, the specific measures taken also include:

[0011] The inner hole shape of the sample includes a tapered cross-section circular straight hole and an equal cross-section circular curved hole.

[0012] The clamp includes an upper gasket, a gland, a lower gasket, a support ring, and a base;

[0013] The inner diameter of the support ring is greater than the outer diameter of the sample, and the sample is located inside the support ring, and the support ring is connected between the gland and the base;

[0014] The gland and the base are provided with a center hole;

[0015] The upper gasket and the lower gasket are circular rings, and the upper gasket and the lower gasket are respectively installed between the center holes of the gland and the base;

[0016] The sample is detachably installed between the upper gasket and the lower gasket, the inner hole of the upper gasket matches one end of the inner hole of the sample, and the inner hole of the lower gasket matches the other end of the inner hole of the sample;

[0017] After the clamp clamps the sample, the inner hole of the sample completely matches the inner holes of the upper gasket and the lower gasket.

[0018] The center hole of the gland and the base is a counterbore through hole, and the diameter of the counterbore is equal to the outer diameter of the upper gasket, the lower gasket, and the sample;

[0019] The bottom hole diameter of the gland, the inner hole diameter of the upper gasket, and the inner hole diameter of the end surface of the sample matched with the upper gasket are equal;

[0020] The bottom hole diameter of the base, the inner hole diameter of the lower gasket, and the inner hole diameter of the end surface of the sample matched with the lower gasket are equal;

[0021] The lower surface of the gland and the upper surface of the base are provided with a first annular groove matched with the support ring;

[0022] The upper surface of the gland is provided with a second annular groove matched with the opening of the upper abrasive cylinder;

[0023] The upper abrasive cylinder is clamped on the upper surface of the gland through the second annular groove and communicates with the counterbore through hole of the gland.

[0024] The base is installed on the upper surface of the machine tool workbench, and the machine tool workbench is provided with a through hole matched with the counterbore through hole of the base;

[0025] The lower abrasive cylinder communicates with the counterbore through hole of the base.

[0026] The upper gasket and the lower gasket are made of flexible material, and the flexible material includes silicone rubber, fluororubber, latex, and polyurethane glue.

[0027] A kind of abrasive flow finishing special fluid abrasive machining performance detection method, under the condition of same pressure and fluid abrasive dosage, respectively implement abrasive flow finishing test based on brand new fluid abrasive and old fluid abrasive, obtain the time of two kinds of test and the mass change of sample before and after test, and then calculate to obtain fluid abrasive flow performance index ζ And cutting performance index ε.

[0028] The above method comprises the following steps:

[0029] Step 1, test design:

[0030] The inner hole shape and size of the sample are designed and the material is selected, and the machine tool working pressure and the fluid abrasive dosage are selected according to the characteristics of the fluid abrasive;

[0031] Step 2, abrasive flow finishing test based on brand new fluid abrasive:

[0032] Take a sample, measure the sample mass M1 before test by using electronic balance, then fill brand new fluid abrasive into the lower abrasive cylinder, and place the sample and clamp assembly on the machine tool workbench;

[0033] Set the machine tool working pressure according to the design of step 1, and control the fluid abrasive dosage by setting the machining cycle number, and start the machine tool;

[0034] After the test, record the test time T N , and measure the sample mass M1' after test by using electronic balance;

[0035] Step 3, abrasive flow finishing test based on old fluid abrasive:

[0036] Take a new sample, measure the sample mass M2 before test by using electronic balance, replace the brand new abrasive in the lower abrasive cylinder of the machine tool with the old abrasive to be tested, and place the new sample and clamp assembly on the machine tool workbench;

[0037] Set the same machine tool working pressure and machining cycle number as step 2, and start the machine tool;

[0038] After the test, record the test time T O , and measure the sample mass M2' after test by using electronic balance;

[0039] Step 4, data analysis: calculate the mass change of sample before and after test of step 2 and step 3, combine the test time, calculate to obtain fluid abrasive flow performance index ζ And cutting performance index ε.

[0040] The fluid abrasive flow performance index ζ And cutting performance index ε described in step 4 above, the calculation formula is respectively:

[0041]

[0042] T O is the time of abrasive flow finishing test based on old fluid abrasive;

[0043] T N is the time of abrasive flow finishing test based on brand-new fluid abrasive;

[0044] ΔM O is the mass change of sample before and after abrasive flow finishing test based on old fluid abrasive;

[0045] ΔM N is the mass change of sample before and after abrasive flow finishing test based on brand-new fluid abrasive;

[0046] ΔM O and ΔM N are calculated by the following formula respectively:

[0047] ΔM N = M1-M1’

[0048] ΔM O = M2-M2’.

[0049] The sample is made of metal or alloy material, and the hardness of the base material and the hardness of the inner hole surface shall not be higher than the hardness of the hard abrasive particles in the fluid abrasive;

[0050] The minimum diameter of the inner hole of the sample shall not be less than 20 times of the maximum diameter of the hard particles in the fluid abrasive, the height of the sample shall not be less than 5 times of the minimum diameter, and the volume of the fluid abrasive used in the abrasive flow finishing test shall not be less than 10 times of the volume of the inner hole of the sample.

[0051] The present application has the following beneficial effects:

[0052] The device of the present application comprises a clamp and two identical samples; the clamp is placed on the workbench of the abrasive flow finishing machine, and is used to clamp the samples, which are cylinders with variable cross-section inner holes; the lower abrasive cylinder is fixed to the lower surface of the machine workbench, and is filled with fluid abrasive, and the abrasive cylinder piston is arranged in the lower abrasive cylinder; the abrasive cylinder piston is connected with the machine, and the machine can control the abrasive cylinder piston to extrude the fluid abrasive in the lower abrasive cylinder to flow through the inner holes of the samples. Based on the device of the present application, the abrasive flow finishing tests based on brand-new fluid abrasive and old fluid abrasive are respectively carried out under the same pressure and fluid abrasive dosage, and the time of the two tests and the mass change of the samples before and after the tests are obtained, and then the fluid abrasive flow performance index and the cutting performance index can be calculated.

[0053] The device has low cost, simple operation and high reliability, and can be directly used in the production site to quantitatively evaluate the cutting performance of the fluid abrasive. BRIEF DESCRIPTION OF DRAWINGS

[0054] Figure 1 is a schematic diagram of the measuring device of the present application;

[0055] Figure 2 is a schematic diagram of the sample in the measuring device of the present application.

[0056] In the figure, 1 is an upper abrasive cylinder, 2 is an upper gasket, 3 is a gland, 4 is a sample, 5 is a fluid abrasive, 6 is a lower gasket, 7 is a support ring, 8 is a base, 9 is a machine tool workbench, 10 is an abrasive cylinder piston, and 11 is a lower abrasive cylinder. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0058] The steps in the present application are arranged by using labels, but are not used to limit the order of the steps, unless the order of the steps is explicitly stated or the execution of a certain step needs other steps as a basis, otherwise the relative order of the steps can be adjusted. It can be understood that the term "and / or" used herein involves and covers any and all possible combinations of one or more of the associated listed items.

[0059] As shown in Figure 1 and Figure 2 , the present application is a kind of abrasive flow finishing special fluid abrasive processing performance detection device, including clamp, two identical samples 4;

[0060] The clamp is placed on the abrasive flow finishing machine tool workbench 9, the clamp is used to clamp the sample 4, the sample 4 is a cylindrical hole with variable cross section, and the sample 4 is a variable cross section hollow cylindrical metal sample assembled in the clamp;

[0061] The lower abrasive cylinder 11 is fixedly connected to the lower surface of the machine tool workbench 9, the fluid abrasive 5 is loaded in the lower abrasive cylinder 11, and the abrasive cylinder piston 10 is built in the lower abrasive cylinder 11, the abrasive cylinder piston 10 is connected with the abrasive flow finishing machine tool, and the machine tool can control the abrasive cylinder piston 10 to extrude the fluid abrasive 5 in the lower abrasive cylinder 11 to flow through the hole of the sample 4.

[0062] The silicon carbide fluid abrasive with organic silicon polymer material as a base is widely used in abrasive flow finishing, and its components will be changed irreversibly and the processing performance will be degraded after long-term use. The flowability and cutting performance of the old abrasive can be detected and evaluated by using the device.

[0063] In the embodiment, the inner hole shape of the sample 4 includes a tapered cross-section straight hole and an equal cross-section curved hole.

[0064] For example, the sample 4 is a 304 stainless steel material cylinder with a tapered cross-section straight hole, the inner hole of which is processed by turning, the diameter is 40 mm, the length is 100 mm, the inner hole major diameter is 30 mm, the taper angle is 3°, and the inner hole surface roughness is R a 0.2 μm.

[0065] The clamp includes an upper gasket 2, a gland 3, a lower gasket 6, a support ring 7 and a base 8.

[0066] The inner diameter of the support ring 7 is greater than the outer diameter of the sample 4, and the sample 4 is located inside the support ring 7, and the support ring 7 is connected between the gland 3 and the base 8.

[0067] The gland 3 and the base 8 are provided with center holes.

[0068] The upper gasket 2 and the lower gasket 6 are circular rings, and the upper gasket 2 and the lower gasket 6 are respectively installed between the center holes of the gland 3 and the base 8.

[0069] The sample 4 can be detachably installed between the upper gasket 2 and the lower gasket 6, the inner hole of the upper gasket 2 matches one end of the inner hole of the sample 4, and the inner hole of the lower gasket 6 matches the other end of the inner hole of the sample 4.

[0070] After the clamp clamps the sample 4, the inner hole of the sample 4 completely matches the inner holes of the upper gasket 2 and the lower gasket 6.

[0071] The center holes of the gland 3 and the base 8 are counterbore through holes, and the counterbore diameter is equal to the outer diameters of the upper gasket 2, the lower gasket 6 and the sample 4.

[0072] The bottom hole diameter of the gland 3, the inner hole diameter of the upper gasket 2 and the inner hole diameter of the end surface of the sample 4 matched with the upper gasket 2 are equal.

[0073] The bottom hole diameter of the base 8, the inner hole diameter of the lower gasket 6 and the inner hole diameter of the end surface of the sample 4 matched with the lower gasket 6 are equal.

[0074] The lower surface of the gland 3 and the upper surface of the base 8 are provided with a first annular groove matched with the support ring 7.

[0075] The upper surface of the gland 3 is provided with a second annular groove matched with the opening of the upper abrasive cylinder 1.

[0076] The upper abrasive cylinder 1 is clamped on the upper surface of the gland 3 through the second annular groove and communicates with the counterbore through hole of the gland 3.

[0077] The base 8 is installed on the upper surface of the machine tool workbench 9, and the machine tool workbench 9 is provided with a through hole matched with the counterbore through hole of the base 8;

[0078] The lower abrasive cylinder 11 is fixedly connected to the lower surface of the machine tool workbench 9;

[0079] The lower abrasive cylinder 11 communicates with the counterbore through hole of the base 8;

[0080] The fluid abrasive 5 is installed in the lower abrasive cylinder 11, the abrasive cylinder piston 10 is built in the lower abrasive cylinder 11, and the abrasive cylinder piston 10 is connected with the machine tool; the abrasive cylinder piston 10 is used to extrude the fluid abrasive 5 in the lower abrasive cylinder 11 to flow through the inner hole of the sample.

[0081] The upper gasket 2 and the lower gasket 6 are made of flexible materials, including but not limited to silicone rubber, fluororubber, latex and polyurethane glue and the like.

[0082] A kind of fluid abrasive machining performance detection method for abrasive flow finishing, under the condition of same pressure and fluid abrasive dosage, respectively implement abrasive flow finishing test based on brand new fluid abrasive and old fluid abrasive, obtain the time of two kinds of tests and the mass change of sample before and after test, and then calculate to obtain fluid abrasive flow performance index ζ and cutting performance index ε.

[0083] The machining performance detection of the fluid abrasive 5 includes the following operation steps:

[0084] Step 1, test design:

[0085] The inner hole shape and size of the sample 4 are designed and the material is selected, the machine tool working pressure and the fluid abrasive dosage are selected according to the characteristics of the fluid abrasive; for example, the machine tool pressure is set to 800 psi, and the fluid abrasive dosage is set to 100 kg;

[0086] Step 2, abrasive flow finishing test based on brand new fluid abrasive:

[0087] Take a sample 4, measure the sample mass M1 before test by using an electronic balance, then fill the brand new fluid abrasive into the lower abrasive cylinder 11, and assemble the sample 4 and the clamp and place them on the machine tool workbench 9;

[0088] Set the machine tool working pressure according to the design of step 1, control the fluid abrasive dosage by setting the number of machining cycles, and start the machine tool;

[0089] After the test, record the test time T NAnd the mass of the sample after the test M1' is measured by using an electronic balance;

[0090] Step 3, abrasive grain flow finishing test based on old fluid abrasive:

[0091] Take a new sample 4, measure the mass of the sample before the test M2 by using an electronic balance, replace the brand-new abrasive in the abrasive cylinder 11 under the machine tool with the old abrasive to be tested, and place the new sample 4 and the clamp assembled together on the machine tool workbench 9;

[0092] Set the same machine tool working pressure and processing cycle number as in step 2, and start the machine tool;

[0093] After the test, record the test time T O And the mass of the sample after the test M2' is measured by using an electronic balance;

[0094] Step 4, data analysis: calculate the mass change of the sample before and after the test in steps 2 and 3, and combine the test time to calculate the fluid abrasive flow performance index ζ and the cutting performance index ε.

[0095] The fluid abrasive flow performance index ζ and the cutting performance index ε in step 4 are calculated by the following formulas respectively:

[0096]

[0097] Wherein, T O is the abrasive grain flow finishing test time based on old fluid abrasive;

[0098] T N is the abrasive grain flow finishing test time based on brand-new fluid abrasive;

[0099] ΔM O is the mass change of the sample before and after the abrasive grain flow finishing test based on old fluid abrasive;

[0100] ΔM N is the mass change of the sample before and after the abrasive grain flow finishing test based on brand-new fluid abrasive;

[0101] ΔM O and ΔM N are calculated by the following formulas respectively:

[0102] ΔM N = M1-M1'

[0103] ΔM O = M2-M2'.

[0104] The sample 4 is made of metal or alloy material, and the hardness of the base material and the hardness of the inner hole surface shall not be higher than the hardness of the hard abrasive grains in the fluid abrasive;

[0105] The inner bore of the test piece 4 must not have a minimum diameter less than 20 times the maximum diameter of the hard particles in the fluid abrasive, the height of the test piece 4 must not be less than 5 times its minimum diameter, and the volume of fluid abrasive 5 used in the abrasive flow finishing test must not be less than 10 times the volume of the inner bore of the test piece 4.

[0106] It should be noted that the terms such as "upper", "lower", "left", "right", "front", "back" and the like used in the description of the invention are only for the convenience of description and are not intended to limit the scope of the invention. The change or adjustment of the relative relationship without substantial change of the technical content is also regarded as the scope of the invention.

[0107] It will be obvious to a person skilled in the art that the application is not limited to the details of the above-described exemplary embodiments, but that the application can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. The embodiments should therefore be considered in all respects as illustrative and not restrictive, the scope of the application being defined by the appended claims rather than that of the above description, and it is therefore intended to embrace all variations falling within the meaning and scope of the equivalent elements of the claims. Any reference signs in the claims should not be considered as limiting the claims involved.

[0108] Furthermore, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the present specification is described in this way only for the sake of clarity, and a person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by a person skilled in the art.

Claims

1. An apparatus for detecting the abrasive performance of a fluid abrasive for abrasive flow finishing, characterized by, The clamp and two identical samples (4) are included. The clamp is placed on the abrasive particle flow finishing machine tool workbench (9) and is used to clamp the sample (4), which is a cylinder with a variable cross-section inner hole. The lower abrasive cylinder (11) is fixed to the lower surface of the machine tool workbench (9), the fluid abrasive (5) is contained in the lower abrasive cylinder (11), and the abrasive cylinder piston (10) is built in the lower abrasive cylinder (11), the abrasive cylinder piston (10) is connected with the abrasive particle flow finishing machine tool, and the machine tool can control the abrasive cylinder piston (10) to extrude the fluid abrasive (5) in the lower abrasive cylinder (11) to flow through the inner hole of the sample (4). The abrasive particle flow finishing special fluid abrasive processing performance detection method using the device comprises the following steps: under the condition of the same pressure and fluid abrasive dosage, the abrasive particle flow finishing tests based on the new fluid abrasive and the old fluid abrasive are respectively carried out, the time of the two tests and the mass change of the sample before and after the test are obtained, and then the fluid abrasive flow performance index ζ and the cutting performance index ε are calculated.

2. The device for detecting the performance of the fluid abrasive machining for the abrasive flow machining according to claim 1, wherein The inner hole shape of the sample (4) includes a gradually changing cross-section circular straight hole and an equal cross-section circular curved hole.

3. The device for detecting the performance of the fluid abrasive machining for the abrasive flow machining according to claim 1, wherein, The clamp includes an upper gasket (2), a gland (3), a lower gasket (6), a support ring (7), and a base (8). The inner diameter of the support ring (7) is greater than the outer diameter of the sample (4), and the sample (4) is located inside the support ring (7), and the support ring (7) is connected between the gland (3) and the base (8). The gland (3) and the base (8) are provided with central holes. The upper gasket (2) and the lower gasket (6) are circular rings, and the upper gasket (2) and the lower gasket (6) are respectively installed between the central holes of the gland (3) and the base (8). The sample (4) can be detachably installed between the upper gasket (2) and the lower gasket (6), the inner hole of the upper gasket (2) matches one end of the inner hole of the sample (4), and the inner hole of the lower gasket (6) matches the other end of the inner hole of the sample (4). After the clamp clamps the sample (4), the inner hole of the sample (4) completely matches the inner holes of the upper gasket (2) and the lower gasket (6).

4. The device for detecting the performance of the fluid abrasive machining for the abrasive flow machining according to claim 3, wherein, The central holes of the gland (3) and the base (8) are counterbore through holes, the counterbore diameter of the counterbore through holes is equal to the outer diameters of the upper gasket (2), the lower gasket (6), and the sample (4). The bottom hole diameter of the gland (3), the inner hole diameter of the upper gasket (2), and the inner hole diameter of the end surface of the sample (4) that matches the upper gasket (2) are equal. The bottom hole diameter of the base (8), the inner hole diameter of the lower gasket (6), and the inner hole diameter of the end surface of the sample (4) that matches the lower gasket (6) are equal. The lower surface of the gland (3) and the upper surface of the base (8) are provided with a first annular groove that matches the support ring (7). The upper surface of the gland (3) is provided with a second annular groove that matches the opening of the upper abrasive cylinder (1). The upper abrasive cylinder (1) is clamped on the upper surface of the gland (3) through the second annular groove and communicates with the counterbore through hole of the gland (3).

5. The device for detecting the performance of the fluid abrasive machining for the abrasive flow machining according to claim 4, wherein, The base (8) is installed on the upper surface of the machine tool workbench (9), and the machine tool workbench (9) is provided with a through hole that matches the counterbore through hole of the base (8). The lower abrasive cylinder (11) is communicated with the counterbore through hole of the base (8).

6. The device for detecting the performance of the fluid abrasive machining for the abrasive flow machining according to claim 3, wherein The upper gasket (2) and the lower gasket (6) are made of flexible materials, including silicone rubber, fluororubber, latex and polyurethane glue.

7. The device for detecting the performance of the fluid abrasive machining for the abrasive flow machining according to claim 1, wherein, The method comprises the following steps: Step 1, test design: The inner hole shape and size of the sample (4) are designed, and the material is selected, and the machine tool working pressure and the fluid abrasive amount are selected according to the fluid abrasive characteristics; Step 2, abrasive grain flow finishing test based on new fluid abrasive: Take a sample (4), measure the sample mass M1 before the test by using an electronic balance, then fill the new fluid abrasive into the lower abrasive cylinder (11), and assemble the sample (4) and the clamp on the machine tool workbench (9); Set the machine tool working pressure according to the design of step 1, and control the fluid abrasive amount by setting the machining cycle number, and start the machine tool; After the test, the test time T is recorded N and the mass of the test sample M1'after the test is measured using an electronic balance. Step 3, abrasive grain flow finishing test based on old fluid abrasive: Take a new sample (4), measure the sample mass M2 before the test by using an electronic balance, replace the new abrasive in the lower abrasive cylinder (11) of the machine tool with the old abrasive to be tested, and assemble the new sample (4) and the clamp on the machine tool workbench (9); Set the same machine tool working pressure and machining cycle number as step 2, and start the machine tool; After the test, the test time T is recorded O and the mass M2' of the test sample after the test is measured using an electronic balance. Step 4, data analysis: calculate the mass change of the sample before and after the test in step 2 and step 3, and combine the test time to calculate the fluid abrasive flow performance index ζ and the cutting performance index ε.

8. The device for detecting the performance of the fluid abrasive machining for the abrasive flow machining according to claim 7, wherein, The fluid abrasive flow performance index ζ and the cutting performance index ε in step 4, the calculation formulas are respectively: wherein T O is the test time for abrasive flow finishing based on old fluid abrasive T N The test time for abrasive flow finishing based on a brand new fluid abrasive ΔM O ΔM is the mass change of the sample before and after the abrasive flow finishing test based on the old fluid abrasive; ΔM N ΔM is the mass change of the sample before and after the abrasive flow finishing test based on the new fluid abrasive. ΔM O and ΔM N respectively using the following equations: ΔM N = M1 - M1' ΔM O = M2 - M2'.

9. The device for detecting the performance of the fluid abrasive machining for the abrasive flow machining according to claim 7, wherein, The sample (4) is made of metal or alloy material, and the hardness of the base material and the inner hole surface hardness shall not be higher than the hardness of the hard abrasive particles in the fluid abrasive; The minimum diameter of the inner hole of the sample (4) shall not be less than 20 times of the maximum diameter of the hard particles in the fluid abrasive, the height of the sample (4) shall not be less than 5 times of the minimum diameter, and the volume of the fluid abrasive (5) used in the abrasive grain flow finishing test shall not be less than 10 times of the inner hole volume of the sample (4).

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