A method and apparatus for ensuring the complete runout of the actuator housing

Abstract

This invention belongs to the technical field of actuator cylinder housings, and discloses a method and device for ensuring the total runout of an actuator cylinder housing. First, the inner bore of the control piston chamber of the actuator cylinder housing is used for rough positioning and alignment before grinding to ensure datum accuracy. Then, the runout value of the control piston chamber inner bore relative to the inner bore of the power piston chamber is detected and recorded at four points around the outer circumference of the part, and marked on the four directions of the outer circumference. After rough positioning with the inner bore of the power piston chamber, alignment is performed according to the marked runout values ​​to eliminate clearance errors in conventional positioning and clamping. After rough grinding, a closed-loop verification is formed to ensure controlled machining conditions. During finish grinding, the inner bore of the control piston chamber is aligned to ensure that the final total runout meets technical requirements. This method overcomes the machining instability caused by clearance and deformation in conventional positioning, reducing the rework rate.

Description

Technical Field

[0001] This invention belongs to the field of actuator housing technology, specifically a method and device for ensuring the full runout of an actuator housing. Background Technology

[0002] The actuator assembly is a crucial component of the gas turbine gas generator control and regulation system. Its primary function is to ensure the stable operation of the low-pressure compressor within a given operating range, guaranteeing the gas generator's performance. The actuator housing is a vital part of this assembly. As a typical housing-type component, it mainly consists of a power piston chamber and a control piston chamber. The total runout of the control piston chamber's inner bore relative to the power piston chamber's inner bore (0.03 mm) is a critical characteristic of this component, and its machining quality plays a significant role in the overall performance of the assembly.

[0003] The actuator cylinder housing has a complex structure and high technical requirements. The parts are prone to deformation during machining, and the two piston holes are coated with a difficult-to-machine chrome layer to increase wear resistance. Conventional positioning and clamping methods cannot eliminate the gap between the part's positioning reference hole and the fixture positioning block. In addition, the parts are prone to deformation, and the tool rigidity is weak. As a result, the machining of the control piston chamber's inner hole and the power piston chamber's inner hole is unstable, leading to a high part rework rate and affecting the timely delivery of parts.

[0004] Existing machining methods typically employ conventional positioning and clamping techniques, following a process route of first machining the inner bore of the power piston cavity, and then machining the inner bore of the control piston cavity. When machining the inner bore of the power piston cavity, the machine is clamped using the inner bore of the control piston cavity for positioning, and the inner bore and end face of the power piston cavity are ground. Similarly, when machining the inner bore of the control piston cavity, the machine is clamped using the inner bore of the power piston cavity for positioning, and the inner bore of the control piston cavity is ground. Internal grinding machines, specialized grinding rods and wheels are used during the machining process, and emulsion cooling is employed.

[0005] The existing technical solutions described above still have the following shortcomings: conventional positioning and clamping methods cannot eliminate the gap between the part's positioning datum hole and the fixture's positioning block, resulting in insufficient positioning accuracy; moreover, the part is prone to deformation during machining, affecting machining accuracy; the small diameter and deep depth of the control piston chamber's inner hole lead to poor grinding rod rigidity during machining, easily causing tool deflection and resulting in shape errors on the surfaces of the datum and the machined element; the high surface hardness and difficult machining of the chrome plating layer further increases the instability of the full runout characteristic technical conditions. These factors combined result in a low part machining pass rate and a high rework rate, affecting on-time part delivery. Summary of the Invention

[0006] This invention provides a method and device for ensuring the full runout of the actuator housing, which solves the problem of unstable full runout machining and high rework rate caused by clearance and deformation in conventional positioning and clamping.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A method for ensuring the total runout of an actuator cylinder housing includes the following steps: using the actuator cylinder housing to roughly position the inner bore of the control piston chamber, aligning the inner bore of the power piston chamber, and grinding the inner bore and end face of the power piston chamber; using a detection device to detect and record the actual runout values ​​of the control piston chamber inner bore relative to the power piston chamber inner bore at four points around its circumference, and marking them on the outer circle P of the part in four directions; using the power piston chamber inner bore for rough positioning, aligning it according to the runout values ​​corresponding to the marks on the outer circle P of the part, and rough grinding the control piston chamber inner bore until it is smooth; detecting the runout value of the control piston chamber inner bore relative to the power piston chamber inner bore again; using the power piston chamber inner bore for rough positioning, aligning the control piston chamber inner bore, and fine grinding the control piston chamber inner bore to its final size.

[0008] According to one embodiment of the present invention, after grinding the inner hole and end face of the power piston cavity, the roundness of the inner hole of the power piston cavity is ensured to be within 0.005mm.

[0009] According to one embodiment of the present invention, the alignment based on the runout values ​​corresponding to the marks on the outer circle P of the part specifically involves adjusting the installation position of the part on the machine tool according to the actual runout values ​​recorded on the outer circle P of the part in the four directions, so that the aligned runout value is consistent with the recorded actual runout value.

[0010] According to one embodiment of the present invention, after re-detecting the runout value of the inner bore of the control piston cavity relative to the inner bore of the power piston cavity, if the runout value is not greater than 0.01 mm, the fine grinding step of the inner bore of the control piston cavity is performed; if the runout value is greater than 0.01 mm, the rough grinding step of the inner bore of the control piston cavity and the re-detection step are repeated.

[0011] According to one embodiment of the present invention, the four directions on the outer circle P of the part are 0°, 90°, 180° and 270° directions.

[0012] According to one embodiment of the present invention, when the rough grinding of the piston cavity inner hole is brought to light, the runout values ​​corresponding to the four directional marks are aligned before processing.

[0013] According to one embodiment of the present invention, when the inner bore of the control piston cavity is finely ground, the inner bore of the control piston cavity is aligned to within 0.005 mm.

[0014] According to one embodiment of the present invention, the grinding of the inner hole of the power piston cavity is carried out by a horizontal internal grinding machine, using a special grinding rod and grinding wheel, and using emulsion cooling, with a cutting depth not exceeding 0.01 mm per cut.

[0015] According to one embodiment of the present invention, the rough grinding control piston cavity inner hole adopts a single-feed repeated tool passing grinding method.

[0016] The present invention also provides a device for ensuring the full runout of the actuator housing, comprising a base, a positioning block and a support mounted on the base, the positioning block being provided with a positioning pin for positioning the inner hole of the power piston chamber of the actuator housing, a guide rail being mounted on the support, a slidable support block being mounted on the guide rail, a lever being mounted on the support block via a shaft pin, one end of the lever being provided with a ball contact for contacting the inner wall of the control piston chamber to be measured, the other end of the lever being used to connect a dial indicator, and the support block also being provided with a spring for adjusting the position of the lever and a lever stop screw.

[0017] Compared with existing technologies, this invention has the following advantages: This invention provides a method for ensuring the total runout of the actuator cylinder housing. First, the actuator cylinder housing is used for rough positioning of the inner bore of the control piston chamber and for grinding of the inner bore of the power piston chamber to ensure datum accuracy. Then, the runout values ​​of the control piston chamber inner bore relative to the power piston chamber inner bore are detected and recorded at four points around the outer circumference of the part, and marked on the four directions of the outer circumference. After rough positioning with the inner bore of the power piston chamber, the workpiece is aligned according to the marked runout values, eliminating clearance errors in conventional positioning and clamping. After rough grinding, a closed-loop verification is formed by testing again to ensure controlled machining conditions. During finish grinding, the control piston chamber inner bore is aligned to ensure that the final total runout meets technical requirements. This method overcomes the machining instability caused by clearance and deformation in conventional positioning, reducing the rework rate. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a flowchart illustrating a method for ensuring the complete runout of the actuator cylinder housing according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the actuator cylinder assembly structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram illustrating the process analysis of machining the inner hole of the actuator cylinder according to an embodiment of the present invention; Figure 4 This is a simplified diagram of the grinding process for the inner hole of the active piston cavity according to an embodiment of the present invention; Figure 5 This is a schematic diagram of a device for ensuring the complete jump of the actuator housing according to an embodiment of the present invention; Figure 6 This is an embodiment of the present invention. Figure 5 Diagram of direction G; Figure 7 This is an embodiment of the present invention. Figure 5 F-direction diagram; Figure 8 This is an embodiment of the present invention. Figure 5 HH cross-section; Figure 9 This is a simplified diagram illustrating the recording of runout values ​​on the outer circle P according to an embodiment of the present invention; Figure 10 This is a simplified diagram of the grinding control piston cavity bore machining according to an embodiment of the present invention; In the diagram, 1-base, 2-positioning block, 3-positioning pin, 4-support, 5-stop block, 6-support block, 7-lever, 8-shaft pin, 9-flat contact, 10-bulb, 11-spring, 12-lever stop screw, 13-screw, 14-guide rail, 15-ball contact, 16-screw, 17-pressure plate, 18-screw, 19-pin, 20-pressure plate, 21-control piston, 22-power piston, 23-actuator housing, 24-control actuator housing. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components.

[0024] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0025] See Figure 1 In one embodiment of the present invention, a method for ensuring the full runout of the actuator cylinder housing is provided, which solves the technical problem that the conventional positioning and clamping method causes unstable full runout characteristics and high rework rate due to positioning gap and machining deformation.

[0026] See Figure 2 The actuator assembly is an important component of the gas turbine gas generator control regulator. Its function is to allow air introduced from the high-pressure compressor to enter the actuator housing 23 and the control actuator housing 24. Due to the different air flow rates entering the two housings, when the pressure in the control actuator housing 24 reaches a certain value, the control piston 21 moves. When it contacts the sealing surface of the power piston 22, the gas pressure inside the actuator housing 23 increases, and the power piston 22 moves, driving the adjustment structure, thereby achieving the purpose of regulating and stabilizing the engine operating conditions.

[0027] See Figure 3 The actuator cylinder housing has a power piston chamber with an inner diameter of ΦB and a depth of L2, and a control piston chamber with an inner diameter of ΦA and a depth of L1. Both piston chamber surfaces are chrome-plated to increase wear resistance. A boss is located in the center of the power piston chamber's inner bore. To avoid this, the grinding rod used for grinding the inner bore may have a small diameter and be long, which could cause tool deflection during machining, resulting in shape errors on the part's reference surface and the surface of the machined element. The control piston chamber's inner bore is relatively deep, resulting in poor rigidity of the grinding rod. Conventional positioning and clamping methods cannot eliminate the gap between the part's positioning reference hole and the fixture's positioning block, and the part is prone to deformation.

[0028] Step S1: Grinding the inner bore of the power piston cavity The piston chamber bore is roughly positioned by controlling the actuator housing, the power piston chamber bore is aligned, and the power piston chamber bore and end face are ground.

[0029] For details, see Figure 4 This step uses a horizontal internal grinding machine, model M2120A. A special fixture is used to position and clamp the part. The piston cavity inner hole is roughly positioned using the actuator cylinder housing, supported by the small end outer diameter face, and the outer diameter boss is pressed tightly. Then, the inner hole of the power piston cavity is aligned to within 0.01mm. A special grinding rod and grinding wheel are used, with a cutting speed of 4000 r / min and a cutting depth of 0.01mm per pass. Emulsion is used for cooling. The inner hole, stepped hole, and end face of the power piston cavity are ground to the final dimensions. After grinding the inner hole and end face of the power piston cavity, the roundness of the inner hole must be within 0.005mm to ensure a good reference state for subsequent machining.

[0030] Explanation: The inner bore of the power piston cavity serves as the reference hole for subsequent full runout machining. This step controls the rough positioning of the piston cavity inner bore, but ultimately, it aligns the inner bore itself, ensuring that the dimensional and geometric tolerances of the reference hole are optimal. Controlling the roundness within 0.005mm eliminates the influence of the reference hole's shape error on subsequent full runout measurements, providing a high-precision reference for subsequent inspection and machining. Due to the presence of a boss in the middle of the power piston cavity inner bore and the small diameter and long length of the grinding rod, a multi-pass cutting method with a depth of 0.01mm per pass effectively avoids tool deflection.

[0031] Step S2: Detect the runout value of the control piston chamber bore. The actual value of the four-point runout of the inner hole of the control piston chamber relative to the inner hole of the power piston chamber is detected and recorded using a detection device, and the marks are made in four directions on the outer circle P of the part.

[0032] For details, see Figures 5 to 8 The testing device includes a base 1, a positioning block 2 and a support 4 mounted on the base 1. The positioning block 2 is provided with a positioning pin 3 for positioning the inner hole of the power piston cavity of the actuator housing. A guide rail 14 is mounted on the support 4, and a slidable support block 6 is mounted on the guide rail 14. A lever 7 is mounted on the support block 6 via a shaft pin 8. One end of the lever 7 is provided with a ball contact 15 for contacting the inner wall of the control piston cavity to be tested, and the other end of the lever 7 is used to connect a dial indicator. The support block 6 is also provided with a spring 11 for adjusting the position of the lever 7 and a lever stop screw 12. The two positioning pins 3 form a positioning circle that mates with the inner hole of the power piston cavity.

[0033] First, place the base 1 of the testing device on the work platform. Then, place the part on the positioning block 2, and align the inner hole of the part's power piston chamber with the two positioning pins 3. Secure a dial indicator with screws 13 and bushings 10. Slide the support block 6 along the guide rail 14 until the ball contact 15 contacts the middle position of the inner wall of the control piston chamber. Adjust the dial indicator's head extension using lever 7 and screw 13, pressing the dial indicator down by approximately 0.2 mm. Then, bring the part close to the positioning pins 3 and rotate the part clockwise. Mark the actual dial indicator readings at four corresponding points on the outer circle P of the part in the directions of 0°, 90°, 180°, and 270°. The positive and negative values ​​must be clearly defined. Repeat the rotation multiple times to ensure the actual values ​​are stable and accurate. See also... Figure 9 The four directions on the outer circle P of the part are 0°, 90°, 180° and 270°. Record these directions on the outer circle P of the part.

[0034] Explanatory: This detection device utilizes two locating pins to form a locating circle that mates with the inner hole of the power piston chamber. This ensures that the locating datum for the part during detection is consistent with the locating datum during machining, adhering to the principle of coincidence of design datum, locating datum, and detection datum, thus avoiding measurement errors. The lever mechanism transmits the positional change of the inner hole wall detected by the ball contact to the dial indicator. By rotating the part, the runout values ​​in four directions on the circumference can be obtained. Recording the runout values ​​in four directions on the outer circumference of the part allows for the reproduction of the runout state in the same direction during subsequent machining and clamping, achieving closed-loop control of "detection-recording-alignment-machining". Multiple rotations ensure stable and accurate detection values, avoiding random errors from single measurements.

[0035] Step S3: Rough grinding of the inner bore of the control piston cavity The piston chamber is roughly positioned using the inner bore of the power piston. The alignment is performed according to the runout values ​​corresponding to the marks on the outer diameter P of the part in four directions. The piston chamber is then rough-ground until it is smooth.

[0036] For details, see Figure 10 This step uses a horizontal internal grinding machine, model M2120A. A special fixture is used to clamp the part, with rough positioning based on the inner hole of the piston chamber in the actuator housing, supported by the outer end face of the large end, and the small end boss is pressed in place. The part is clamped onto the fixture, and its position on the machine tool is adjusted according to the actual runout values ​​recorded on the outer diameter P of the part in four directions. Alignment is performed using the runout values ​​recorded at four corresponding points in the 0°, 90°, 180°, and 270° directions on the outer diameter P of the part, ensuring the aligned runout values ​​match the recorded actual runout values. A special grinding rod and grinding wheel are used, with a cutting speed of 5000 r / min and a cutting depth of 0.01 mm. An emulsion is used for cooling. A single-feed, repeated-pass grinding method is employed, grinding the piston chamber inner hole until it is smooth.

[0037] Explanatory: Alignment is performed based on the runout values ​​recorded in step S2, ensuring the part's clamping state on the machine tool matches its state during inspection. This eliminates the clearance error between the positioning reference hole and the fixture positioning block. Since step S2 measures the runout value under the actual machining condition of the part, grinding after alignment ensures that the machining allowance of the control piston cavity's inner hole is evenly distributed along the circumference, avoiding part deformation caused by unilateral cutting. The single-feed, repeated-pass grinding method reduces the force on the grinding rod, preventing tool deflection due to poor rigidity.

[0038] Step S4: Re-check the runout value of the control piston chamber bore. The runout value of the control piston chamber bore relative to the power piston chamber bore is checked again.

[0039] Specifically, following step S2, the runout value of the control piston cavity inner hole relative to the power piston cavity inner hole is detected again using a detection device. If the runout value is not greater than 0.01mm, step S5, fine grinding of the control piston cavity inner hole, is performed; if the runout value is greater than 0.01mm, step S3, rough grinding of the control piston cavity inner hole, and step S4, re-detection, are repeated.

[0040] Explanatory: Immediate inspection is performed after rough grinding to form a closed-loop verification of "processing-inspection". A threshold of 0.01mm is used as the judgment threshold; if the runout value meets the requirements, the product proceeds to fine grinding; otherwise, it is reworked, preventing defective products from flowing into the fine grinding process and causing waste. This threshold is based on the technical requirement of a final total runout of 0.03mm, allowing for processing allowance in the fine grinding process.

[0041] Step S5: Fine grinding of the inner bore of the control piston cavity The inner bore of the power piston chamber is used for rough positioning, the inner bore of the control piston chamber is aligned, and the inner bore of the control piston chamber is finely ground to the final size.

[0042] Specifically, this step uses a horizontal internal grinding machine, model M2120A. A special fixture is used to clamp the part, with rough positioning of the piston cavity's inner bore in the actuator housing, supported by the outer end face of the large end, and the small end boss is pressed against it. Then, the piston cavity's inner bore is aligned and controlled to be within 0.005mm. A special grinding rod and grinding wheel are used, with a cutting speed of 8000 r / min and a cutting depth of 0.005mm. An emulsion is used for cooling. A single-feed, repeated-pass grinding method is employed to control the minimum taper of the upper and lower cross-sections of the inner bore, finally machining the part's inner bore to its final dimensions.

[0043] Explanation: During finish grinding, the alignment is done on the inner bore of the control piston chamber itself after rough grinding, not on recalibrating the runout value. The purpose is to ensure the dimensional and positional accuracy of the inner bore itself. Alignment within 0.005mm ensures that the roundness and cylindricity of the inner bore are optimal. Using a faster cutting speed of 8000 rpm and a smaller cutting depth of 0.005mm achieves higher surface quality and dimensional accuracy. A single-feed, repeated pass method effectively controls the taper of the upper and lower sections of the inner bore.

[0044] Step S6: Final Detection After removing and cleaning the parts, send them to a coordinate measuring machine to check the measured value of the total runout of the inner hole of the actuator control piston chamber relative to the inner hole of the power piston chamber.

[0045] Explanatory: A coordinate measuring machine is an independent precision measuring device whose measurement results are not affected by human factors and can be used as the final basis for determining whether a part is qualified.

[0046] In one possible implementation, the present invention also provides a device for ensuring the complete runout of the actuator housing. See also Figures 5 to 8 The device includes a base 1, a positioning block 2 mounted on the base 1, and a support 4. The positioning block 2 has two positioning pins 3 for positioning the inner hole of the power piston chamber of the actuator housing, forming a positioning circle that mates with the inner hole of the power piston chamber. A guide rail 14 is mounted on the support 4, and a slidable support block 6 is mounted on the guide rail 14. A lever 7 is mounted on the support block 6 via a pivot pin 8. One end of the lever 7 has a ball contact 15 for contacting the inner wall of the control piston chamber to be measured, and the other end of the lever 7 is used to connect a dial indicator. The support block 6 also has a spring 11 for adjusting the position of the lever 7 and a lever stop screw 12. The base 1 also has a stop block 5, a pressure plate 17, and a pressure plate 20 for fixing and limiting related components. A bushing 10 and a screw 13 are used to fix the dial indicator. A flat contact 9 is mounted on the lever 7 for dial indicator head contact. See also Figure 7 During the movement, the ball contact 15 is perpendicular to surface A, with a deviation of no more than 0.01 mm.

[0047] The working principle of this device is as follows: the part is positioned by engaging with two locating pins 3 within the inner hole of the power piston chamber, achieving a positioning reference consistent with that used during machining. The sliding block 6 along the guide rail 14 causes the ball contact 15 to contact the inner wall of the control piston chamber, transmitting the positional change of the inner wall to the dial indicator via the lever 7. Rotating the part allows for the measurement of runout values ​​in different circumferential directions.

[0048] The experimental results show that the method of the present invention effectively eliminates the influence of positioning gap through the closed-loop control strategy of "detection-recording-alignment-processing-re-detection", overcomes the problem of processing instability caused by part deformation and poor rigidity of grinding rod, significantly improves the part processing qualification rate, and verifies the effectiveness and practicality of the method of the present invention.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0050] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A method of ensuring full stroke of a cylinder housing, characterized by, Includes the following steps: The inner bore of the piston chamber is roughly positioned by the actuator housing, the inner bore of the power piston chamber is aligned, and the inner bore and end face of the power piston chamber are ground. The actual value of the runout of the inner hole of the control piston chamber relative to the inner hole of the power piston chamber is detected and recorded using a detection device, and the four directions are marked on the outer circle P of the part. Use the inner hole of the power piston chamber for rough positioning, and align it according to the runout values ​​corresponding to the marks on the outer circle P of the part in four directions. Roughly grind the inner hole of the piston chamber until it is smooth. The runout value of the control piston chamber bore relative to the power piston chamber bore is checked again; The inner bore of the power piston chamber is used for rough positioning, the inner bore of the control piston chamber is aligned, and the inner bore of the control piston chamber is finely ground to the final size.

2. The method for ensuring the full runout of the actuator cylinder housing according to claim 1, characterized in that, After grinding the inner hole and end face of the power piston cavity, the roundness of the inner hole of the power piston cavity is guaranteed to be within 0.005mm.

3. The method for ensuring the full runout of the actuator cylinder housing according to claim 1, characterized in that, The step of aligning the parts according to the runout values ​​corresponding to the marks on the outer circle P of the part specifically involves adjusting the installation position of the part on the machine tool based on the actual runout values ​​recorded on the outer circle P of the part in the four directions, so that the aligned runout value is consistent with the recorded actual runout value.

4. The method for ensuring the full runout of the actuator cylinder housing according to claim 1, characterized in that, After re-detecting the runout value of the inner bore of the control piston cavity relative to the inner bore of the power piston cavity, if the runout value is not greater than 0.01mm, the fine grinding step of the inner bore of the control piston cavity is performed; if the runout value is greater than 0.01mm, the rough grinding step of the inner bore of the control piston cavity and the re-detection step are repeated.

5. The method for ensuring the full runout of the actuator cylinder housing according to claim 1, characterized in that, The four directions on the outer circle P of the part are 0°, 90°, 180° and 270°.

6. The method for ensuring the full runout of the actuator cylinder housing according to claim 1, characterized in that, When the rough grinding of the piston cavity bore is brought to light, the runout values ​​corresponding to the four directional marks are first aligned.

7. The method for ensuring the full runout of the actuator cylinder housing according to claim 1, characterized in that, When fine-grinding the inner bore of the control piston cavity, the inner bore of the control piston cavity is aligned to within 0.005mm.

8. The method for ensuring the full runout of the actuator cylinder housing according to claim 1, characterized in that, The grinding of the inner bore of the power piston cavity is carried out using a horizontal internal grinding machine, with a special grinding rod and grinding wheel, and emulsion cooling. The cutting depth per cut does not exceed 0.01 mm.

9. The method for ensuring the full runout of the actuator cylinder housing according to claim 1, characterized in that, The rough grinding control piston cavity inner hole adopts a single-feed repeated tool passing grinding method.

10. A device for ensuring the complete runout of the actuator cylinder housing, characterized in that, Includes a base (1), a positioning block (2) and a support (4) mounted on the base (1). The positioning block (2) is provided with a positioning pin (3) for positioning the inner hole of the power piston cavity of the actuator housing. The support (4) is provided with a guide rail (14). The guide rail (14) is provided with a slidable support block (6). The support block (6) is provided with a lever (7) mounted on it via a shaft pin (8). One end of the lever (7) is provided with a ball contact (15) for contacting the inner hole wall of the control piston cavity to be measured. The other end of the lever (7) is used to connect a dial indicator. The support block (6) is also provided with a spring (11) for adjusting the position of the lever (7) and a lever stop screw (12).

Images