A measuring method for machining compressor cylinder blade slots

Abstract

The application discloses a kind of for processing compressor cylinder blade slot measuring method, including fixture part and the measuring device being set at fixture part opposite side, fixture part can drive workpiece to carry out C-axis rotation, fixture part includes the several clamping devices that can be to workpiece end face is compressed and the positioning device that can be to workpiece inner hole is positioned, measuring device includes the probe that can reciprocate along X axis and Z axis, so that blade slot is not needed to be turned to vertical position, i.e. in the case where additional Y axis is not needed, angle and displacement are indirectly measured by formula coefficient to carry out subsequent grinding operation, without complex design work, it can be realized accurate measurement, effectively control cost, the application belongs to mechanical processing technical field.

Description

Technical Field

[0001] This invention belongs to the field of machining technology, and more specifically relates to a measurement method for machining compressor cylinder blade grooves. Background Technology

[0002] During the operation of a compressor, the cylinder and piston together form the working volume. The reciprocating motion of the piston changes the size of the working volume, thereby compressing the gas. The compressor cylinder is a cylindrical metal component that guides the piston in linear reciprocating motion within the cylinder. It withstands gas pressure, friction between the piston surface and the piston ring support ring, and the heat generated during gas compression.

[0003] Blade slots are grooves formed on the inner wall of a compressor cylinder, typically used to accommodate and support blades. The position, width, and straightness of the blade slots all affect the compressor's performance. When the blades reciprocate or rotate within the cylinder, they slide within the blade slots and closely engage with the piston, thereby changing the working volume within the cylinder and compressing the gas.

[0004] Currently, the positional accuracy of the preceding process in blade groove grinding is poor, and the symmetry between the groove and the inner hole is significantly different. As a result, the grinding allowance of the groove plane is very small. In order to meet the positioning requirements of the blade groove, the blade groove needs to be measured and then ground. For the positioning of the blade groove, it is usually necessary to measure in the left and right X-axis direction and the up and down Y-axis direction of the workpiece. However, adding a Y-axis structure will increase the cost and design difficulty. Summary of the Invention

[0005] The main objective of this invention is to provide a method for measuring the blade grooves of a compressor cylinder, which measures the angle and displacement of the blade grooves without requiring a Y-axis.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] A measurement method for machining compressor cylinder blade grooves includes a fixture part and a measuring device disposed on the opposite side of the fixture part. The fixture part can drive the workpiece to rotate along the C-axis. The fixture part includes a plurality of clamping devices that can clamp the end face of the workpiece and a positioning device that can position the inner hole of the workpiece. The measuring device includes a probe that can reciprocate along the X-axis and Z-axis. The probe can determine the size and position of the groove and hole to be machined by collecting multi-point workpiece groove and inner hole geometric dimensional features and relative machine tool coordinate position data before and after workpiece machining.

[0008] According to a first aspect of the present invention, the measurement method includes:

[0009] 1) Rotating the C-axis causes the workpiece blade groove to rotate to a horizontal position, allowing the probe to enter the blade groove for measurement;

[0010] 2) The measuring device moves along the X-axis and moves the probe to one end of the blade groove to be processed. This point is recorded as point A. The workpiece is rotated along the C-axis to measure the angle between the probe at point A and the horizontal line, which is α1.

[0011] 3) The measuring device moves in the opposite direction along the X-axis, moves the probe to the other end of the blade groove to be processed, and records this point as point B. The workpiece is rotated along the C-axis to measure the angle between the probe at point B and the horizontal line, which is α2.

[0012] 4) The compensation angle is calculated using the first formula. The compensation angle plus 90° is the grinding angle. The first formula includes (α1+α2) / 2+(α1-α2)*coefficient.

[0013] 5) The grinding compensation displacement ΔL in the X-axis direction is calculated by the second formula. The second formula includes 2*(distance difference between point A and point B in the X-axis direction)*s in(α1-α2)*coefficient, which is obtained from experimental data.

[0014] According to a first aspect of the present invention, the clamping part further includes a mounting base, a plurality of clamping devices are spaced apart on one side of the mounting base, and the positioning device is located within the mounting base.

[0015] According to a first aspect of the present invention, the clamping device includes a driving device and a pressure arm disposed at the output end of the driving device, the driving device being capable of driving the pressure arm to clamp or release the workpiece.

[0016] According to a first aspect of the present invention, each of the pressure arms is provided with a pressure block at the end away from the driving device.

[0017] According to a first aspect of the present invention, the positioning device includes a cylinder and a piston rod capable of reciprocating within the cylinder. One end of the piston rod is provided with a positioning mandrel, and the other end of the positioning mandrel is provided with an elastic portion capable of contacting and positioning with the inner hole of the workpiece.

[0018] According to a first aspect of the present invention, the elastic part can enter the inner circle of the workpiece to be processed under the push of the piston rod, and perform internal support, tensioning and positioning of the inner hole of the workpiece.

[0019] According to a first aspect of the present invention, a cover is fixedly connected to one end of the cylinder body, and a guide sleeve is provided on the outer side of the cover.

[0020] One of the above-described technical solutions of the present invention has at least one of the following advantages or beneficial effects:

[0021] This invention, through a fixture and a measuring device, eliminates the need to rotate the blade slot to a vertical position. That is, without the need to add an additional Y-axis, it indirectly measures angles and displacements using formulas and coefficients for subsequent grinding operations. It achieves accurate measurement without complex design work, effectively controlling costs. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0023] Appendix Figure 1 This is an overall structural diagram of one embodiment of the present invention;

[0024] Appendix Figure 2 This is a side view of an embodiment of the present invention;

[0025] Appendix Figure 3 This is a cross-sectional view along the CC direction according to an embodiment of the present invention;

[0026] Appendix Figure 4 This is a schematic diagram of the probe at point A according to an embodiment of the present invention;

[0027] Appendix Figure 5 This is a schematic diagram of the probe at point B according to an embodiment of the present invention;

[0028] Appendix Figure 6 This is a schematic diagram of the grinding compensation displacement ΔL according to an embodiment of the present invention;

[0029] Appendix Figure 7 This is a front view of the clamping part according to an embodiment of the present invention. Detailed Implementation

[0030] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0031] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and 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 limiting this invention.

[0032] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" and "second" may explicitly or implicitly include one or more features.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection or a movable connection, a detachable connection or a non-detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection or a connection that allows communication between the two components; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components, an indirect connection, or an interaction between two components.

[0035] The following disclosure provides many different implementations or examples for different ways of implementing the present invention.

[0036] See attached document Figure 1 To be continued Figure 7 As shown, a measurement method for machining compressor cylinder blade grooves includes a fixture part 1 that can drive the workpiece to rotate along the C-axis and a measuring device 2 provided on the opposite side of the fixture part 1. The fixture part 1 includes a mounting base 13, three clamping devices 11 that can clamp the end face of the workpiece, and a positioning device 12 that can position the inner hole of the workpiece.

[0037] In one embodiment of the present invention, three clamping devices 11 are spaced apart on one side of the mounting base 13, and the positioning device 12 is located inside the mounting base 13. The clamping device 11 includes a driving device 111 and a pressure arm 112 provided at the output end of the driving device 111. The pressure arm 112 is provided perpendicular to the output end of the driving device 111. The driving device 111 can drive the pressure arm 112 to press or release the workpiece, and each pressure arm 112 is provided with a pressure block 113 at the end away from the driving device 111 that can directly contact the end face of the workpiece.

[0038] In one embodiment of the present invention, the positioning device 12 includes a cylinder 121 and a piston rod 122 that can reciprocate within the cylinder 121. A cover is fixedly connected to one end of the cylinder 121, and a guide sleeve is provided on the outer side of the cover. A positioning mandrel 123 is provided at one end of the piston rod 122, and an mounting sleeve is fitted onto the positioning mandrel 123. A first conical surface is provided on the inner side of the mounting sleeve. A second conical surface is provided at one end of the positioning mandrel 123, and an elastic portion is provided at the other end of the positioning mandrel 123 that can contact and position itself within the inner hole of the workpiece. The second conical surface can engage with the first conical surface under the action of the piston rod 122, achieving a conical surface fit. This not only reduces wear but also ensures zero-clearance guidance.

[0039] In one embodiment of the present invention, the elastic part can enter the inner circle of the workpiece under the push of the piston rod 122, and perform internal support and tension positioning on the inner hole of the workpiece. The elastic part is in the shape of a circular petal, and the diameter of the elastic part is set to be larger than the diameter of the inner circle of the workpiece. This can ensure the applicability of the elastic part at one end of the positioning mandrel 123. Thus, the elastic part can be pushed into the inner circle of the workpiece by the piston rod 122 under the action of the return spring, hydraulic oil circuit or air circuit, and then shrink. As the elasticity expands outward, it further supports and tightens the inner hole of the workpiece, ensuring accurate centering. Furthermore, the part where the elastic part contacts and positions the inner hole of the workpiece is the elastic deformation zone. The inner hole size of the workpiece has a tolerance range, and the gap can be eliminated by shrinking and clamping.

[0040] In one embodiment of the present invention, the piston rod 122 can reciprocate within the cylinder 121 via a pneumatic passage, an oil passage, or a return spring that can be compressed within the cylinder 121. Specifically, if a return spring is used, the piston rod 122 can be pushed forward under the action of the return spring, thereby making the second conical surface at one end of the positioning spindle 123 tightly engage with the first conical surface inside the mounting sleeve. Then, the piston rod 122 is controlled by a hydraulic oil passage, thereby controlling the retraction of the positioning spindle 123 and compressing the return spring. Alternatively, the return spring can be omitted, and the piston rod 122 can be controlled to reciprocate using pneumatic or hydraulic means. The forward and backward movements of the positioning spindle 123 can be controlled by the extension and retraction of the piston rod 122.

[0041] In one embodiment of the present invention, the measuring device 2 includes a probe 21 capable of reciprocating along the X-axis and Z-axis. The probe 21 can determine the size and position of the groove and hole to be processed by collecting multi-point workpiece groove and inner hole geometric dimensional features and relative machine tool coordinate position data before and after workpiece processing. The steps for measuring the blade groove include:

[0042] Step 1: After fixing the workpiece with clamping device 11, rotate the C-axis to rotate the workpiece blade groove to a horizontal position so that the probe 21 can enter the blade groove for measurement.

[0043] The second step is to move the measuring device 2 along the X-axis, thereby moving the probe 21 synchronously to one end of the groove in the blade to be processed, and record this point as point A (see attached diagram). Figure 4 The angle between the probe 21 at point A and the horizontal line is α1, which is obtained by using the fixture part 1 to drive the workpiece to rotate along the C-axis.

[0044] Step 3: Move the measuring device 2 in the opposite direction along the X-axis, which will move the probe 21 to the other end of the blade groove to be processed. Record this point as point B (see attached diagram). Figure 5 The angle between the probe 21 at point B and the horizontal line is α2, which is obtained by using the fixture part 1 to drive the workpiece to rotate along the C-axis.

[0045] Step 4: Calculate the compensation angle using the first formula. Add 90° to the corresponding compensation angle to get the Y-axis grinding angle. The first formula includes (α1+α2) / 2+(α1-α2)*coefficient.

[0046] Step 5: Calculate the grinding compensation displacement ΔL in the X-axis direction using the second formula, which includes 2*(distance difference between point A and point B in the X-axis direction)*s in(α1-α2)*coefficient. The coefficient is obtained from experimental data and is preferably 4.85.

[0047] This eliminates the previous method of measuring the blade slot position by rotating the blade slot to a vertical position and then measuring via the left and right X-axis and the up and down Y-axis. This measurement method can indirectly measure angle and displacement without adding the up and down Y-axis, using the first formula, the second formula, and the coefficient 4.85. It achieves accurate measurement without complicated design work and effectively controls costs.

[0048] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A measuring method for machining compressor cylinder blade slot, comprising a clamp part (1) and a measuring device (2) arranged on the opposite side of the clamp part (1), characterized in that, The clamp part (1) can drive the workpiece to rotate around the C-axis, and the clamp part (1) comprises a plurality of clamping devices (11) capable of pressing the end face of the workpiece and a positioning device (12) capable of positioning the inner hole of the workpiece; The measuring device (2) comprises a measuring head (21) capable of reciprocating along the X-axis and the Z-axis, and the measuring head (21) can determine the size and position of the to-be-processed groove and hole by collecting the geometric size features of the workpiece groove and hole and the relative machine tool coordinate position data before and after the workpiece is processed. The measuring method comprises: 1) The C-axis rotation makes the workpiece blade groove rotate to a horizontal position, so that the measuring head (21) enters the blade groove for measurement; 2) The measuring device (2) moves along the X-axis direction, moves the measuring head (21) to one end of the to-be-processed blade groove, records the point as point A, and the C-axis rotation workpiece measurement shows that the angle between the measuring head (21) and the horizontal line at point A is α1; 3) The measuring device (2) moves reversely along the X-axis, moves the measuring head (21) to the other end of the to-be-processed blade groove, records the point as point B, and the C-axis rotation workpiece measurement shows that the angle between the measuring head (21) and the horizontal line at point B is α2; 4) The compensation angle is calculated by a first formula, and the compensation angle plus 90° is the grinding angle, and the first formula comprises (α1+α2) / 2+(α1-α2)*coefficient; 5) The grinding compensation displacement ΔL in the X-axis direction is calculated by a second formula, and the second formula comprises 2*(distance difference between point A and point B in the X-axis direction)*sin(α1-α2)*coefficient, and the coefficient is obtained through experimental data.

2. The method for measuring compressor cylinder blade slot machining according to claim 1, characterized in that: The clamp part (1) further comprises a mounting seat (13), a plurality of clamping devices (11) are arranged at one side of the mounting seat (13), and the positioning device (12) is located in the mounting seat (13).

3. The method for measuring compressor cylinder blade slot machining according to claim 2, characterized in that: The clamping device (11) comprises a driving device (111) and a pressing arm (112) arranged at the output end of the driving device (111), and the driving device (111) can drive the pressing arm (112) to press or release the workpiece.

4. The method of measuring for machining compressor cylinder blade slots of claim 3, wherein: Each pressing arm (112) is provided with a pressing block (113) at one end away from the driving device (111).

5. The method of measuring for machining compressor cylinder blade slots of claim 2, wherein: The positioning device (12) comprises a cylinder body (121) and a piston rod (122) capable of reciprocating in the cylinder body (121), one end of the piston rod (122) is provided with a positioning mandrel (123), and the other end of the positioning mandrel (123) is provided with an elastic part capable of contacting and positioning the inner hole of the workpiece.

6. The method of measuring for machining compressor cylinder blade slots of claim 5, wherein: The elastic part can enter the inner circle of the to-be-processed workpiece under the pushing of the piston rod (122) to tightly position the inner hole of the workpiece.

7. The method of measuring for machining compressor cylinder blade slots of claim 5, wherein: One end of the cylinder body (121) is fixedly connected with a cover, and the outer side of the cover is provided with a guide sleeve.

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