Measurement method for processing compressor cylinder blade groove

Abstract

The invention discloses a measuring method for machining a blade groove of a compressor cylinder, which comprises a clamp part and a measuring device arranged on the opposite side of the clamp part, the clamp part can drive a workpiece to perform C-axis rotation, and the clamp part comprises a plurality of clamping devices capable of pressing the end face of the workpiece and a positioning device capable of positioning the inner hole of the workpiece. The measuring device comprises a measuring head capable of reciprocating along an X axis and a Z axis, so that the blade groove does not need to be rotated to a vertical position, namely, under the condition of not additionally adding a Y axis, the angle and the displacement are indirectly measured through formula coefficients to carry out subsequent grinding operation, accurate measurement can be realized without complex design work, the cost is effectively controlled, and the working efficiency is improved. The invention belongs to the technical field of machining.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing, and more specifically relates to a measuring method for processing compressor cylinder blade slots. Background Art

[0002] During the operation of the compressor, the cylinder and the piston together constitute the working volume, and the reciprocating motion of the piston changes the size of the working volume, thereby achieving the compression of the gas. The compressor cylinder is a cylindrical metal part that guides the piston to perform linear reciprocating motion in the cylinder. It bears the gas pressure, the friction between the mirror and the piston ring support ring, and the heat generated when compressing the gas.

[0003] The blade groove is a groove opened on the inner wall of the compressor cylinder, usually used to accommodate and support the blade. The position, width and straightness of the blade groove will affect the performance of the compressor. When the blade reciprocates or rotates in the cylinder, it will slide in the blade groove and fit tightly with the piston, thereby changing the working volume in the cylinder and achieving gas compression.

[0004] At present, the positioning accuracy of the front process of blade groove grinding is not good, and the symmetry between the groove and the inner hole is greatly different. Therefore, 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 directions and the up and down Y-axis directions of the workpiece. However, adding a Y-axis structure will increase the cost and increase the design difficulty. Summary of the invention

[0005] The main purpose of the present invention is to provide a method for measuring a compressor cylinder blade slot, which can measure the angle and displacement of the blade slot without the need for a Y-axis.

[0006] To achieve the above object, the technical solution of the present invention is:

[0007] A measuring method for machining compressor cylinder blade slots, comprising a fixture part and a measuring device arranged on the opposite side of the fixture part, wherein the fixture part can drive a workpiece to rotate along a C-axis, the fixture part comprises a plurality of clamping devices that can press the end surface of the workpiece and a positioning device that can position the inner hole of the workpiece, and the measuring device comprises a probe that can reciprocate along the X-axis and the Z-axis, and the probe can determine the size and position of the slot and hole to be machined by collecting multi-point workpiece slot and inner hole geometric size characteristics and relative machine tool coordinate position data before and after the workpiece is machined.

[0008] According to a first aspect of the present invention, the measuring method comprises:

[0009] 1) The C-axis rotates to rotate the blade slot of the workpiece to a horizontal position, so that the probe enters the blade slot for measurement;

[0010] 2) The measuring device moves along the X-axis direction, moves the probe to one end of the blade slot to be processed, records the point as point A, rotates the workpiece along the C-axis to measure, and obtains that the angle between the probe at point A and the horizontal line 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 slot to be processed, records this point as point B, rotates the workpiece along the C-axis to measure, and finds that the angle between the probe at point B and the horizontal line is α2;

[0012] 4) The compensation angle is calculated by the first formula, and 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, and the second formula includes 2*(the distance difference between point A and point B in the X-axis direction)*s in(α1-α2)*coefficient, and the coefficient is obtained through experimental data.

[0014] According to an embodiment of the first aspect of the present invention, the clamp portion further comprises a mounting seat, a plurality of the clamping devices are arranged at intervals on one side of the mounting seat, and the positioning device is located inside the mounting seat.

[0015] According to the first aspect of the present invention, the clamping device includes a driving device and a pressing arm arranged at an output end of the driving device, and the driving device can drive the pressing arm to press or loosen the workpiece.

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

[0017] According to the first aspect of the present invention, the positioning device includes a cylinder body and a piston rod capable of reciprocating movement in the cylinder body, one end of the piston rod is provided with a positioning core shaft, and the other end of the positioning core shaft is provided with an elastic part that can contact and position with the inner hole of the workpiece.

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

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

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

[0021] The present invention uses a fixture and a measuring device, and there is no need to turn the blade slot to a vertical position, that is, without adding an additional Y-axis, and indirectly measures the angle and displacement through formulas and coefficients to perform subsequent grinding operations. Accurate measurement can be achieved without complex design work, effectively controlling costs. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] Attached Figure 1 It is an overall structural diagram of an embodiment of the present invention;

[0024] Attached Figure 2 A side view of an embodiment of the present invention;

[0025] Attached Figure 3 A cross-sectional view taken along the CC direction of an embodiment of the present invention;

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

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

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

[0029] Attached Figure 7 It is a front view of a clamp portion according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0031] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the term "connection" should be understood in a broad sense. 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, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be internal connection between two elements, indirect connection, or an interactive relationship between two elements.

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

[0036] See attached Figure 1 To Attachment Figure 7 As shown, a measuring method for processing compressor cylinder blade grooves includes a fixture part 1 that can drive the workpiece to rotate on the C-axis and a measuring device 2 arranged on the opposite side of the fixture part 1, wherein the fixture part 1 includes a mounting seat 13, three clamping devices 11 that can press the end surface 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 arranged at intervals on one side of a mounting seat 13, the positioning device 12 is located in the mounting seat 13, the clamping device 11 includes a driving device 111 and a pressure arm 112 arranged at the output end of the driving device 111, the pressure arm 112 is arranged perpendicular to the output end of the driving device 111, the driving device 111 can drive the pressure arm 112 to press or loosen the workpiece, and a pressure block 113 that can directly contact the end face of the workpiece is respectively provided at one end of each pressure arm 112 away from the driving device 111.

[0038] In one embodiment of the present invention, the positioning device 12 includes a cylinder body 121 and a piston rod 122 that can reciprocate in the cylinder body 121, one end of the cylinder body 121 is fixedly connected to a cover, the outer side of the cover is provided with a guide sleeve, one end of the piston rod 122 is provided with a positioning mandrel 123, the positioning mandrel 123 is sleeved with a mounting sleeve, the inner side of the mounting sleeve is provided with a first cone surface, one end of the positioning mandrel 123 is provided with a second cone surface, and the other end of the positioning mandrel 123 is provided with an elastic portion that can contact and position with the inner hole of the workpiece. The second cone surface can be connected with the first cone surface under the action of the piston rod 122 to achieve the matching of the cone surfaces, which can not only reduce wear, but also achieve gapless guidance.

[0039] In one embodiment of the present invention, the elastic portion can enter the inner circle of the workpiece to be processed under the push of the piston rod 122, and internally support and tighten the inner hole of the workpiece for positioning. The elastic portion is in the shape of a circular petal, and the diameter of the elastic portion is set to be larger than the diameter of the inner circle of the workpiece, which can ensure the applicability of the elastic portion at one end of the positioning core shaft 123. Therefore, the elastic portion can be pushed into the inner circle of the workpiece to be processed by the piston rod 122 under the action of the reset spring or the hydraulic oil circuit or the air circuit to achieve contraction, and due to the elasticity, it will expand outward, thereby internally supporting and tightening the inner hole of the workpiece to ensure accurate centering, and the part where the elastic portion is in contact with the inner hole of the workpiece for positioning is an elastic deformation zone, and the size of the inner hole 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 achieve reciprocating motion in the cylinder body 121 through an air circuit, an oil circuit or a return spring that can be compressed in the cylinder body 121. Specifically, if a return spring design is adopted, the piston rod 122 can be pushed forward under the action of the return spring, so that the second conical surface at one end of the positioning core shaft 123 is tightly matched with the first conical surface on the inner side of the mounting sleeve. The piston rod 122 is then controlled through the hydraulic oil circuit to control the retraction of the positioning core shaft 123 and compress the return spring. The return spring can also be eliminated and the reciprocating motion of the piston rod 122 can be controlled by pneumatic or oil pressure. The forward and backward movements of the positioning core shaft 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 that can reciprocate along the X-axis and the 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 size characteristics and relative machine tool coordinate position data before and after the workpiece is processed. Then, the steps of measuring the blade groove include:

[0042] The first step is to fix the workpiece by the clamping device 11, and then rotate the C-axis to rotate the blade slot of the workpiece to a horizontal position, so that the probe 21 can enter the blade slot for measurement;

[0043] The second step is to move the measuring device 2 along the X-axis direction, thereby driving the probe 21 to move synchronously to one end of the blade groove to be processed, and record this point as point A (refer to the attached Figure 4 ), the fixture part 1 is used to drive the workpiece to perform C-axis rotation measurement, and it is found that the angle between the probe 21 at point A and the horizontal line is α1;

[0044] Step 3: Move the measuring device 2 in the opposite direction along the X-axis to drive the probe 21 to move to the other end of the blade slot to be processed, and record this point as point B (see attached Figure 5 ), the fixture part 1 is used to drive the workpiece to perform C-axis rotation measurement, and it is found that the angle between the probe 21 at point B and the horizontal line is α2;

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

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

[0047] This ends the previous method of measuring the blade slot position, which requires turning the blade slot to a vertical position and then measuring it through the left and right X-axes and the upper and lower Y-axes. This measurement method can indirectly measure the angle and displacement through the first formula, the second formula and the coefficient 4.85 without adding the upper and lower Y-axes. It can achieve accurate measurement without complicated design work, effectively controlling costs.

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

Claims

1. A measuring method for machining compressor cylinder blade slots, comprising a fixture (1) and a measuring device (2) arranged on the opposite side of the fixture (1), characterized in that: The clamping part (1) can drive the workpiece to rotate along the C axis, and the clamping part (1) comprises a plurality of clamping devices (11) that can press the end surface of the workpiece and a positioning device (12) that can position the inner hole of the workpiece; The measuring device (2) comprises a probe (21) capable of reciprocating along an X-axis and a Z-axis, and the probe (21) can determine the size and position of the groove or hole to be processed by collecting multi-point workpiece groove and inner hole geometrical dimension characteristics and relative machine tool coordinate position data before and after the workpiece is processed; The measuring method comprises: 1) The C-axis rotates to rotate the blade slot of the workpiece to a horizontal position, so that the probe (21) enters the blade slot for measurement; 2) The measuring device (2) moves along the X-axis direction, moves the probe (21) to one end of the blade slot to be processed, records the point as point A, rotates the workpiece along the C-axis to measure, and obtains that the angle between the probe (21) at point A and the horizontal line is α1; 3) The measuring device (2) moves in the opposite direction along the X-axis, moves the probe (21) to the other end of the blade slot to be processed, records the point as point B, rotates the workpiece along the C-axis to measure, and obtains that the angle between the probe (21) at point B and the horizontal line is α2; 4) The compensation angle is calculated by the first formula, and the compensation angle plus 90° is the grinding angle. The first formula includes (α1+α2) / 2+(α1-α2)*coefficient; 5) The grinding compensation displacement ΔL in the X-axis direction is calculated by the second formula, and the second formula includes 2*(the 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 measuring method for machining compressor cylinder blade grooves according to claim 1, characterized in that: The clamping part (1) further comprises a mounting seat (13), a plurality of the clamping devices (11) are arranged at intervals on one side of the mounting seat (13), and the positioning device (12) is located inside the mounting seat (13).

3. The measuring method for machining compressor cylinder blade grooves 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); the driving device (111) can drive the pressing arm (112) to press or release the workpiece.

4. The measuring method for machining compressor cylinder blade grooves according to claim 3, characterized in that: A pressing block (113) is provided at one end of each pressing arm (112) away from the driving device (111).

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

6. The measuring method for machining compressor cylinder blade grooves according to claim 5, characterized in that: The elastic part can enter the inner circle of the workpiece to be processed under the push of the piston rod (122) to perform internal support, tension and positioning on the inner hole of the workpiece.

7. The measuring method for machining compressor cylinder blade grooves according to claim 5, characterized in that: One end of the cylinder body (121) is fixedly connected to a sealing cover, and a guide sleeve is provided on the outer side of the sealing cover.

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