Intelligent axial match grinding machining method for slide valve

Abstract

The invention belongs to the technical field of machining, and relates to an intelligent axial match grinding machining method for a slide valve. The method comprises the steps that valve element part features, machine tool features and rough machining basic parameters are obtained; according to valve element part characteristics, machine tool characteristics and rough machining basic parameters, calculating axial final coordinates after left and right side faces are roughly machined by a machine tool; roughly machining the valve element part through a grinding wheel according to the characteristics and the final coordinates of the valve element part; matching part axial match grinding detection data of the roughly machined valve element part are obtained; the overlapping amount of odd throttling edges and even throttling edges is judged; if the judgment result of the odd throttling edges is negative overlapping, redistributing overlapping amount data of each throttling edge; obtaining finish machining basic parameters; according to valve element part characteristics, machine tool characteristics, finish machining basic parameters and initial values, axial final relative coordinates after left and right side faces are subjected to finish machining by a machine tool are calculated, and the minimum allowance is not ground after conversion of the left and right side faces; and according to the characteristics of the valve element part, the valve element part is subjected to finish machining through a grinding wheel without grinding the minimum allowance and the final coordinates.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing and relates to an intelligent axial grinding processing method for a slide valve. Background Art

[0002] Through the relative axial displacement of the valve core and the valve sleeve, the size of the valve sleeve throttling window is changed. Based on the strictly established relationship between the relative axial displacement of the valve core and the valve sleeve and the valve flow, the flow output is controlled. The overlap between the throttling edges of the valve core and the corresponding square holes of the valve sleeve is a key indicator of the sliding valve. Due to the limitations of the existing processing methods and processing accuracy of the square holes of the valve sleeve, it is difficult for the valve core and the valve sleeve to interchange and match to meet the overlap index requirements. Usually, the valve sleeve and the valve core are matched and ground axially, that is, the axial position size of the corresponding throttling edge of the valve core is matched and ground based on the axial position size of the square holes of the valve sleeve to achieve and ensure the overlap index. The axial matching and grinding of the throttling edge of the valve core is a key manufacturing technology for sliding valves. For a long time, the flow matching and grinding detection data (the initial overlap data of the pairs measured by the hydraulic method) has been mainly recorded and transmitted on paper, the matching and grinding processing data has been mainly analyzed and calculated manually, and the matching and grinding of the throttling edge has been mainly processed by manually operated manual grinders. Each key link is greatly affected by human factors. Based on the above reasons, the axial matching and grinding of the throttling edge of the valve core is not efficient and the processing quality is unstable. With the continuous growth of production tasks, users' requirements for product performance and quality are constantly improving. The method of manually grinding the throttling edge of the valve core on a manual grinder cannot meet the ever-increasing demands for quality and efficiency. Summary of the invention

[0003] The purpose of the present invention is to provide a method for programming and processing a numerically controlled axial grinding process for a valve core throttling edge, so as to realize automated and intelligent axial grinding process for the valve core throttling edge on a numerically controlled cylindrical grinder, improve the grinding process quality, improve the grinding process efficiency, and fully meet various needs.

[0004] Technical Solution

[0005] Provided is a sliding valve intelligent axial grinding processing method, comprising:

[0006] Obtain valve core part features, machine tool features, and basic rough machining parameters;

[0007] According to the valve core parts features, machine tool features and rough machining basic parameters, the final axial coordinates of the left and right sides of each throttle edge of the valve after rough machining by the grinding wheel are calculated;

[0008] According to the valve core part features and final coordinates, the valve core parts are roughly machined by grinding wheel;

[0009] Obtain the axial wear test data of the valve core parts after rough machining; determine the overlap amount of the odd-numbered throttling edges and the even-numbered throttling edges respectively;

[0010] If the overlap amount of any throttle edge among the odd-numbered throttle edges is negative overlap, and the overlap amounts of the even-numbered throttle edges are all non-negative overlaps, the overlap amounts of each throttle edge are redistributed; the overlap amount data of each throttle edge is used as the initial value of the final axial relative coordinate after finishing the left side of the grinding wheel of the corresponding throttle edge;

[0011] Get basic finishing parameters;

[0012] According to the valve core parts features, machine tool features, basic finishing parameters and initial values, the final relative axial coordinates of the left and right sides of each throttle edge of the finishing valve are calculated, and the minimum margin after the left and right sides are converted without grinding is calculated;

[0013] According to the valve core parts features, without grinding the minimum allowance, and the final coordinates, the valve core parts are fine-machined by grinding wheels.

[0014] Furthermore, the valve core part features include:

[0015] Taking the third throttling edge as the reference, the axial coordinate values ​​of other throttling edges to the reference;

[0016] The distance between the third throttling edge and the left end face of the part, the axial distance between the opposite faces of the throttling edge of the valve core / 2, the diameter size of the throttling edge of the valve core, the diameter size of the narrow neck, the reserved clearance for narrow neck grinding, the measuring depth of the probe, the radial measuring coordinates of the probe, and the radial grinding depth.

[0017] Furthermore, the machine tool characteristics include: a system error of the left side measured by the probe, a system error of the right side measured by the probe, a tool allowance for the left side when the grinding wheel is grinding, and a tool allowance for the right side when the grinding wheel is grinding.

[0018] Furthermore, the rough machining basic parameters include: the fine machining basic parameters include: the reserved margin after machining the throttling edge on the side opposite to the reference throttling edge, the average overlap, the minimum margin for not grinding the right side, and the minimum margin for not grinding the left side.

[0019] Furthermore, the calculation formula of the final axial coordinates after the grinding wheel of each throttle edge of the machine tool rough machining valve grinds the left and right sides is:

[0020] #181=#141+#140-#129-#131;

[0021] #182=#142+#140+#128+#130-#137;

[0022] #155=#143+#140-#129-#131;

[0023] #189=#144+#140+#128+#130-#137;

[0024] #185=#145+#140-#129-#131;

[0025] #186=#146+#140+#128+#130-#137;

[0026] #187=#147+#140-#129-#131;

[0027] #188=#148+#140+#128+#130-#137;

[0028] #181-#188 are the final axial coordinates after the machine tool roughly processes the left and right sides of the first to eighth throttling edges of the valve with the grinding wheel; #141-#148 are the axial coordinate values ​​from the first to the eighth throttling edges to the reference; #140 is the distance between the third throttling edge and the left end face of the part; #149 is the result of dividing the axial distance between the opposite faces of the throttling edges of the valve core by 2; #121 is the diameter size of the throttling edge of the valve core; #122 is the diameter size of the narrow neck; #123 is the reserved gap for the narrow neck grinding; #124 is the depth measured by the probe; #125=#121-#124 is the radial measurement coordinate of the probe, and #126=#122+#123 is the radial grinding depth; #128 is the system error of the probe measuring the left side; #129 is the system error of the probe measuring the right side; #130 is the tool allowance for the left side when the grinding wheel is grinding; #131 is the tool allowance for the right side when the grinding wheel is grinding.

[0029] Furthermore, the calculation formula of the final axial coordinates after the grinding wheel of each throttling edge of the machine tool finishing valve grinds the left and right sides is:

[0030] #191'=-#191-#129-#131;

[0031] #192'=#192+#128+#130-#137;

[0032] #193'=-#193-#129-#131;

[0033] #194'=#194+#128+#130-#137;

[0034] #195'=-#195-#129-#131;

[0035] #196'=#196+#128+#130-#137;

[0036] #197'=-#197-#129-#131;

[0037] #198'=#198+#128+#130-#137;

[0038] #191-#198 are the redistributed overlaps of the first to eighth throttle edges; #191'-#198' are the final axial coordinates of the left and right side surfaces of the first to eighth throttle edges of the machine tool finishing valve after the grinding wheel is ground; #137 is the reserved allowance after machining the throttle edge opposite to the reference throttle edge; #138 is the average overlap; #156 is the minimum allowance for not grinding the right side; #157=#137 is the minimum allowance for not grinding the left side.

[0039] Furthermore, the calculation formula for the minimum margin without grinding after conversion of the left and right sides is:

[0040] #158=-#156-#129-#131;

[0041] #159=#157+#128+#130-#137;

[0042] #158 is the minimum allowance without grinding after conversion on the right side; #159 is the minimum allowance without grinding after conversion on the left side.

[0043] Furthermore, the overlap data of each throttling edge is redistributed, including:

[0044] The minimum overlap in the negative overlap is assigned to 0, and the absolute value of the minimum overlap is added to the overlap of other throttling edges to obtain the overlap of each throttling edge after redistribution.

[0045] Beneficial effects: The invention consolidates the best axial grinding processing method and process of the throttling edge of the valve core, and the knowledge and experience of manual grinding processing in the module program, and the axial grinding detection data of the paired parts are registered and intelligently output by information technology; the program guides the machine tool probe to measure online, the grinding processing data is calculated and analyzed in real time, the grinding status is decided independently, and the CNC grinder is controlled to execute accurately, so that the sliding valve core and the valve sleeve can realize intelligent axial grinding processing on the CNC grinder, while greatly improving the grinding processing quality and doubling the grinding processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic diagram of the relationship between the throttling edge of the valve core and the variable of the present invention.

[0047] Figure 2 It is a schematic diagram of the probe measuring the throttling edge of the valve core of the present invention.

[0048] Figure 3 It is a schematic diagram of the flow matching and grinding detection data registration system. DETAILED DESCRIPTION

[0049] The present invention is based on intelligent, standardized, modular CNC machining program design, and automatically realizes intelligent axial grinding of the valve core throttle edge under different machine tools, different parts, and different machining conditions through the scientific combination and application of each module program. The intelligent valve core throttle edge axial grinding method includes:

[0050] 1. NC programming of each intelligent and standardized module

[0051] 1) Valve core parts feature module program

[0052] O2003 (XXX1 valve core feature module program)

[0053] %;

[0054] O2003;

[0055] #141 = -33.5; see Figure 1

[0056] #142 = -11.8;

[0057] #143=0;

[0058] #144=21.7;

[0059] #145=48.7;

[0060] #146=70.4;

[0061] #147=82.2;

[0062] #148=103.9;

[0063] #140=48; Distance between the 3 sides and the left end face of the part

[0064] #149=21.7 / 2 Axial distance between the throttling edge of the valve core and the opposite surface / 2

[0065] #121=18.18; Valve core throttling edge diameter

[0066] #122=12.98; Neck diameter

[0067] #123=0.4; Neck grinding reserved clearance (diameter size)

[0068] #124=1; Probe penetration depth (diameter dimension)

[0069] #125=#121-#124; Probe radial measurement coordinates (diameter size)

[0070] #126=#122+#123; Radial grinding depth (diameter size)

[0071] M99;

[0072] %;

[0073] 2) Machine tool feature module program

[0074] O2006 (XX1 machine tool feature module program)

[0075] %;

[0076] O2006;

[0077] #128=0; Probe measuring the left side system error (surface normal to the left is the left side) A1 #129=0; Probe measuring right side system error (surface normal to the right, i.e. right side) A0 #130=0; Grinding wheel grinding left side cutter allowance

[0078] #131=0; Grinding wheel grinding right side cutter allowance

[0079] M99;

[0080] %;

[0081] 3) Rough machining parameter module program

[0082] O3001 (rough machining parameter module program)

[0083] %;

[0084] O3001;

[0085] #137=0.05; After the throttling edge on the opposite side to the reference throttling edge is processed, a reserve margin of M99 is reserved;

[0086] %;

[0087] 4) Rough machining calculation management module program

[0088] O3005 (rough machining calculation management module program)

[0089] %;

[0090] O3005;

[0091] #181=#141+#140-#129-#131;

[0092] #182=#142+#140+#128+#130-#137; Final axial coordinate after grinding the left side with the grinding wheel #155=#143+#140-#129-#131; Final axial coordinate after grinding the right side with the grinding wheel #189=#144+#140+#128+#130-#137;

[0093] #185=#145+#140-#129-#131;

[0094] #186=#146+#140+#128+#130-#137;

[0095] #187=#147+#140-#129-#131;

[0096] #188=#148+#140+#128+#130-#137;

[0097] M99;

[0098] %;

[0099] 5) Rough machining module program

[0100] O3006 (rough machining module program)

[0101] %;

[0102] O3006;

[0103] G206 A1 M2 T1 X#125Z0; Roughly grind the leftmost end face of the measured part G9600 A0 T1 Grinding wheel adjustment program

[0104] G9201 X#126Z#181T1 A5 B0.3 C0.3 Q15 D1 E0.3 F0.1;

[0105] G9201 X#126Z#155T1 A5 B0.3 C0.3 Q15 D1 E0.3 F0.1;

[0106] G9201 X#126Z#185T1 A5 B0.3 C0.3 Q15 D1 E0.3 F0.1;

[0107] G9201 X#126Z#187T1 A5 B0.3 C0.3 Q15 D1 E0.3 F0.1;

[0108] G9201 X#126Z#182T11 A5 B0.3 C0.3 Q15 D1 E0.3 F0.1;

[0109] G9201 X#126Z#189T11 A5 B0.3 C0.3 Q15 D1 E0.3 F0.1;

[0110] G9201 X#126Z#186T11 A5 B0.3 C0.3 Q15 D1 E0.3 F0.1;

[0111] G9201 X#126Z#188T11 A5 B0.3 C0.3 Q15 D1 E0.3 F0.1;

[0112] M99;

[0113] %;

[0114] 6) Finishing parameter module program

[0115] O4001 (fine machining parameter module program)

[0116] %;

[0117] O4001;

[0118] #137=0.015; Reserve margin after machining the throttling edge on the opposite side of the reference throttling edge

[0119] #138=0.005; mean overlap

[0120] #156=0.003; The minimum allowance for not grinding the right side

[0121] #157=#137; Minimum allowance for not grinding the left side

[0122] M99;

[0123] %;

[0124] 7) The detection data module program is automatically generated (throttling edge 3 is the reference throttling edge)

[0125] O1101 (Test data module program)

[0126] %;

[0127] O1101

[0128] #199=1;

[0129] M99;

[0130] %;

[0131] like Figure 3 As shown, a flow matching and grinding detection data registration system is developed, and the axial matching and grinding detection data of the paired parts is input or transmitted to the data registration system. After confirmation, the detection data module program with the part number as the program number is automatically generated and output, so that the finishing main program can automatically call the matching and grinding detection data according to the program number.

[0132] 8) Finishing calculation management module program

[0133] O4006 (fine machining calculation management module program)

[0134] %;

[0135] O4006;

[0136] #181=#141; Probe measures the axial starting point coordinates of the left side

[0137] #182=#141; The probe measures the coordinates of the starting point of the right axis

[0138] #155=#143;

[0139] #189=#143;

[0140] #185=#145;

[0141] #186=#145;

[0142] #187=#147;

[0143] #188=#147;

[0144] #191=-#191-#129-#131; Final relative coordinates of the axial direction after the grinding wheel grinds the right side

[0145] #192=#192+#128+#130-#137; Final relative coordinate of the axial direction after the grinding wheel grinds the left side #193=-#193-#129-#131;

[0146] #194=#194+#128+#130-#137;

[0147] #195=-#195-#129-#131;

[0148] #196=#196+#128+#130-#137;

[0149] #197=-#197-#129-#131;

[0150] #198=#198+#128+#130-#137;

[0151] #158=-#156-#129-#131; The right side does not grind the minimum allowance after conversion #159=#157+#128+#130-#137; The minimum margin M99 is not ground after conversion on the left side;

[0152] %;

[0153] 9) Finishing processing module program

[0154] O4008 (fine machining module program)

[0155] %;

[0156] O4008;

[0157] G9600 A0 T1

[0158] IF[#199EQ-1]GOT0 9

[0159] N1 IF[#191GE#158]GOT0 2

[0160] G206 A0 M2 T1 X#125Z#181;

[0161] IF[ABS[#102-#103]GE 0.001]GOT0 11;

[0162] M3 S300;

[0163] G9201 X#126Z#191T1 A5 B0.3 C0.3 Q15 D1 E0.2 F0.1

[0164] G0 X100;

[0165] M5;

[0166] GOTO 2;

[0167] N11 M1;

[0168] GOTO 1;

[0169] N2 IF[#192LE#159]GOT0 3

[0170] G206 A1 M2 T1 X#125Z#182;

[0171] IF[ABS[#102-#103]GE 0.001]GOT0 21;

[0172] M3 S300;

[0173] G9201 X#126 Z#192 T11 A5 B0.3 C0.3Q15 D1 E0.2 F0.1; G0 X100;

[0174] M5;

[0175] GOTO 3;

[0176] N21 M1;

[0177] GOTO 2;

[0178] N3 IF[#193 GE#158]GOT0 4;

[0179] G206 A0 M2 T1 X#125 Z#155;

[0180] IF[ABS[#102-#103]GE 0.001]GOT0 31;

[0181] M3 S300;

[0182] G9201 X#126 Z#193 T1 A5 B0.3 C0.3 Q15 D1 E0.2 F0.1;G0 X100;

[0183] M5;

[0184] GOTO 4;

[0185] N31 M1;

[0186] GOTO 3;

[0187] N4 IF[#194 LE#159]GOT0 5

[0188] G206 A1 M2 T1 X#125 Z#189;

[0189] IF[ABS[#102-#103]GE 0.001]GOT0 41;

[0190] M3 S300;

[0191] G9201 X#126 Z#194 T11 A5 B0.3 C0.3 Q15 D1 E0.2 F0.1;G0 X100;

[0192] M5;

[0193] GOTO 5;

[0194] N41 M1;

[0195] GOTO 4;

[0196] N5 IF[#195 GE#158]GOT0 6

[0197] G206 A0 M2 T1 X#125 Z#185;

[0198] IF[ABS[#102-#103]GE 0.001]GOT0 51;

[0199] M3 S300;

[0200] G9201 X#126 Z#195 T1 A5 B0.3 C0.3 Q15 D1 E0.2 F0.1;G0 X100;

[0201] M5;

[0202] GOTO 6;

[0203] N51 M1;

[0204] GOTO 5;

[0205] N6 IF[#196 LE#159]GOT0 7

[0206] G206 A1 M2 T1 X#125 Z#186;

[0207] IF[ABS[#102-#103]GE 0.001]GOT0 61;

[0208] M3 S300;

[0209] G9201 X#126 Z#196 T11 A5 B0.3 C0.3 Q15 D1 E0.2 F0.1;G0 X100;

[0210] M5;

[0211] GOTO 7;

[0212] N61 M1;

[0213] GOTO 6;

[0214] N7 IF[#197 GE#158]GOT0 8

[0215] G206 A0 M2 T1 X#125 Z#187;

[0216] IF[ABS[#102-#103]GE 0.001]GOT0 71;

[0217] M3 S300;

[0218] G9201 X#126 Z#197 T1 A5 B0.3 C0.3 Q15 D1 E0.2 F0.1;G0 X100;

[0219] M5;

[0220] GOTO 8;

[0221] N71 M1;

[0222] GOTO 7;

[0223] N8 IF[#198LE#159]GOT0 9

[0224] G206 A1 M2 T1 X#125Z#188;

[0225] IF[ABS[#102-#103]GE 0.001]GOT0 81;

[0226] G9201 X#126Z#198T11 A5 B0.3 C0.3 Q15 D1 E0.2 F0.1;

[0227] G0 X100;

[0228] M5;

[0229] GOTO 9;

[0230] N81 M1;

[0231] GOTO 8;

[0232] N9 G9679;

[0233] M99;

[0234] %;

[0235] 2. Module NC program call processing

[0236] 1) Rough machining main program design - call the corresponding module program through M98 to grind the axial size of the valve core throttling edge to the range that the test bench can measure.

[0237] O3000 (rough machining main program)

[0238] %;

[0239] O3000;

[0240]

[0241] M98 P3001 (rough machining parameter module program)

[0242] M98 P3005 (rough machining calculation management module program)

[0243] M98 P3006 (rough machining module program)

[0244] M30;

[0245] %;

[0246] 2) Design of finishing main program - call corresponding module program through M98, and realize intelligent grinding according to the axial grinding detection data of the mating parts

[0247] O4000 (Main program for finishing)

[0248] %;

[0249] O4000;

[0250]

[0251] Module Program)

[0252] M98 P2003 (XXX1 valve core feature module program)

[0253] M98 P2006 (XX1 machine tool feature module program)

[0254] M98 P4001 (finishing parameter module program)

[0255] M98 P4006 (finishing calculation management module program)

[0256] M98 P4008 (finishing processing module program)

[0257] M30;

[0258] %;

[0259] To use different machine tools, process different parts, and perform different times of grinding, you only need to adjust the corresponding module program number and replace the call of different module programs. It is intelligent, scientific, fast and convenient.

[0260] 3. Implementation of key intelligent technologies

[0261] 1) Automatically judge and intelligently process the axial wear test data of the mating parts through the flow wear test data registration system ( Figure 2 );

[0262] Each time it is input into the flow grinding test data registration system ( Figure 3 ) automatically judges the overlap of 1, 5, and 7 sides of the axial grinding detection data of the paired parts. If it is a negative overlap, the overlap data of each throttling side is intelligently calculated and redistributed according to the rules and output. The processing program independently decides whether to perform subsequent grinding processing based on the output results. If the overlap data of 2, 4, 6, and 8 sides has a negative value, it will be scrapped directly, otherwise it will continue to be processed.

[0263] 2) The program intelligently determines the processing status of the valve core throttling edge according to the parameters, and independently decides whether each throttling edge needs to be processed;

[0264]

[0265] Before grinding a throttling edge, the processing program first intelligently determines whether the throttling edge needs to be processed based on the grinding detection data of the throttling edge to be processed of the valve core. If the throttling edge overlap is greater than the specified value (the values ​​on the left and right sides are different), the throttling edge needs to be processed and the program is executed sequentially; otherwise, the throttling edge does not need to be processed and automatically jumps to the next throttling edge processing program, and so on, until completion.

[0266] 3) Intelligently judge the reliability of probe measurement through the program, perform intelligent error prevention, and independently decide on subsequent actions

[0267] Intelligent grinding processing uses a program to realize a standard mode in which the probe automatically measures a valve core throttling edge and automatically grinds one side according to the axial grinding detection data of the mating parts. When designing a measurement program to measure the axial size of a valve core throttling edge, rotate the C axis to measure one point (time) at the C0 and C180 degree positions. The program automatically extracts the measured values ​​and compares them, automatically determines whether the measurement is reliable, and independently decides on subsequent actions. For example, when the difference between the two values ​​is less than 0.001, it is reliable and the processing continues. Otherwise, the machine is stopped for inspection or re-measurement.

[0268] 4) By adjusting the O2006 (machine tool feature module program) program parameters, automatic compensation of the probe measurement system error and the grinding wheel grinding system error can be achieved.

Claims

1. A method for intelligent axial grinding of a sliding valve, characterized in that: include: Obtain valve core part features, machine tool features, and basic rough machining parameters; According to the valve core parts features, machine tool features and rough machining basic parameters, the final axial coordinates of the left and right sides of each throttle edge of the valve after rough machining by the grinding wheel are calculated; According to the valve core part features and final coordinates, the valve core parts are roughly machined by grinding wheel; Obtain the axial grinding test data of the valve core parts after rough machining; determine the overlap amount of odd-numbered throttling edges and even-numbered throttling edges respectively; If the overlap amount of any throttle edge among the odd-numbered throttle edges is negative overlap, and the overlap amounts of the even-numbered throttle edges are all non-negative overlaps, the overlap amounts of each throttle edge are redistributed; the overlap amount data of each throttle edge is used as the initial value of the final axial relative coordinate after finishing the left and right sides of the grinding wheel of the corresponding throttle edge; Get basic finishing parameters; According to the valve core parts features, machine tool features, basic finishing parameters and initial values, the final relative axial coordinates of the left and right sides of each throttle edge of the finishing valve are calculated, and the minimum margin after the left and right sides are converted without grinding is calculated; According to the valve core parts features, without grinding the minimum allowance, and the final coordinates, the valve core parts are fine-machined by grinding wheels.

2. The method according to claim 1, characterized in that Valve core part features include: Taking the third throttling edge as the reference, the axial coordinate values ​​of other throttling edges to the reference; The distance between the third throttling edge and the left end face of the part, the axial distance between the opposite faces of the throttling edge of the valve core / 2, the diameter size of the throttling edge of the valve core, the diameter size of the narrow neck, the reserved clearance for narrow neck grinding, the measuring depth of the probe, the radial measuring coordinates of the probe, and the radial grinding depth.

3. The method according to claim 2, characterized in that The machine tool characteristics include: the system error of the left side measured by the probe, the system error of the right side measured by the probe, the tool allowance of the left side when grinding the grinding wheel, and the tool allowance of the right side when grinding the grinding wheel.

4. The method according to claim 3, characterized in that The basic parameters for finishing include: the reserved allowance after machining the throttling edge opposite to the reference throttling edge, the average overlap, the minimum allowance for not grinding the right side, and the minimum allowance for not grinding the left side.

5. The method according to claim 4, characterized in that The calculation formula for the final axial coordinates after the grinding wheel of each throttle edge of the machine tool rough machining valve grinds the left and right sides is: #181＝#141+#140-#129-#131； #182＝#142+#140+#128+#130-#137； #155＝#143+#140-#129-#131； #189＝#144+#140+#128+#130-#137； #185＝#145+#140-#129-#131； #186＝#146+#140+#128+#130-#137； #187＝#147+#140-#129-#131； #188＝#148+#140+#128+#130-#137； #181-#188 are the final axial coordinates after the machine tool roughly processes the left and right sides of the first to eighth throttling edges of the valve with the grinding wheel; #141-#148 are the axial coordinate values ​​from the first to the eighth throttling edges to the reference; #140 is the distance between the third throttling edge and the left end face of the part; #149 is the result of dividing the axial distance between the opposite faces of the throttling edges of the valve core by 2; #121 is the diameter size of the throttling edge of the valve core; #122 is the diameter size of the narrow neck; #123 is the reserved gap for the narrow neck grinding; #124 is the depth measured by the probe; #125=#121-#124 is the radial measurement coordinate of the probe, and #126=#122+#123 is the radial grinding depth; #128 is the system error of the probe measuring the left side; #129 is the system error of the probe measuring the right side; #130 is the tool allowance for the left side when the grinding wheel is grinding; #131 is the tool allowance for the right side when the grinding wheel is grinding.

6. The method according to claim 5, characterized in that The calculation formula for the final axial coordinates of the left and right sides of each throttle edge of the machine tool finishing valve after the grinding wheel grinds the left and right sides is: #191’＝-#191-#129-#131； #192’＝#192+#128+#130-#137； #193’＝-#193-#129-#131； #194’＝#194+#128+#130-#137； #195’＝-#195-#129-#131； #196’＝#196+#128+#130-#137； #197’＝-#197-#129-#131； #198’＝#198+#128+#130-#137； #191-#198 are the redistributed overlaps of the first to eighth throttle edges; #191'-#198' are the final axial coordinates of the left and right sides of the first to eighth throttle edges of the machine tool finishing valve after the grinding wheel is ground; #137 is the reserved allowance after machining the throttle edge opposite to the reference throttle edge; #138 is the average overlap; #156 is the minimum allowance for not grinding the right side; #157 is the minimum allowance for not grinding the left side.

7. The method according to claim 5, characterized in that The calculation formula for the minimum margin after conversion of the left and right sides without grinding is: #158＝-#156-#129-#131； #159＝#157+#128+#130-#137； #158 is the minimum allowance without grinding after conversion on the right side; #159 is the minimum allowance without grinding after conversion on the left side.

8. The method according to claim 1, characterized in that Redistribute the overlap data of each throttling edge, including: The minimum negative overlap in the negative overlap is assigned to 0, and the absolute value of the minimum overlap is added to the overlap of other throttling edges to obtain the overlap of each throttling edge after redistribution.

Images