A machining process for semi-enclosed narrow grooves in ring-shaped parts

Abstract

This invention relates to a machining process for semi-enclosed narrow grooves in ring-shaped parts, comprising the following steps: Step 1: Installing a dedicated clamping device on a CNC lathe; Step 2: Installing the parts sequentially along the circumferential direction; Step 3: Rotating the CNC lathe worktable, aligning the empty space with the positive X-axis, and manually adjusting the tool position; Step 4: Compiling the CNC program; Step 5: After machining, repositioning the worktable to the angular position recorded in Step 3, stopping the worktable rotation, moving the tool to perform a retraction action, and ending the part machining. This invention enables the tool to enter from the gap between two parts, achieving narrow groove machining. The machined parts have acceptable dimensions, good surface quality, and meet design requirements.

Description

Technical Field

[0001] This invention relates to the field of aero-engine technology, specifically to a machining process for semi-enclosed narrow grooves in ring-shaped parts. Background Technology

[0002] See the structure of ring-shaped parts. Figure 1 Maximum diameter of the part The part has a height of 104mm, a main body wall thickness of 3mm, and a chord length of 63.5mm. One end of the part has a semi-closed groove structure with a groove width of 3mm and a groove depth of 7.8mm along the radial direction of the part. It should be machined using an L-shaped insert. The radial width at the opening is 7.1mm, which is less than the groove depth and less than the required width of the insert tool. This does not meet the tool infeed conditions, and the part cannot be machined. Summary of the Invention

[0003] To solve the above technical problems, the present invention provides a method for machining semi-enclosed narrow grooves in ring-shaped parts; the specific technical solution is as follows:

[0004] A machining process for a semi-enclosed narrow groove in a ring-shaped part includes the following steps:

[0005] Step 1: Install the special clamping device on the CNC lathe, align the datum surface of the device with a runout of 0.01 max, and then tighten the device after alignment;

[0006] Step 2: Install the parts in sequence along the circumference, leaving one empty space unfilled, and prepare the cutting tools at the same time.

[0007] Step 3: Rotate the CNC lathe worktable, align the empty space with the positive X-axis, manually adjust the tool position to ensure that the tool can enter from the reserved empty space, and record the current angular position value of the worktable.

[0008] Step 4: When compiling the CNC program, first position the worktable to the angular position recorded in Step 3, move the tool to perform the feed action, and after completion, start the worktable to rotate forward and perform cutting machining according to the CNC program toolpath.

[0009] Step 5: After machining is completed, reposition the worktable to the angular position recorded in Step 3, stop the worktable rotation, move the tool to perform a retraction action, and end the part machining.

[0010] The preferred embodiment of the semi-enclosed narrow groove machining process for ring-shaped parts is as follows: in step one, the special clamping device includes a base, a support ring, a positioning block, a slider, a pressure plate, and a lifting eye screw.

[0011] The base is disc-shaped and has multiple sets of pin holes along the inner circumference. Each set of pin holes is arranged along the circumference. The cylindrical pin is inserted into the pin hole, and the support ring is arranged on the base along the outer side of the cylindrical pin and is locked and fixed by the internal hexagonal head screw.

[0012] The support ring is provided with multiple pin holes along its circumference. The positioning pin a is located at the center of the connecting plate. One end of the positioning pin a is inserted into the pin hole of the support ring and fixed to the outer wall of the support ring by the connecting plate.

[0013] The other end of the positioning pin a is inserted into the stepped hole of the ring-shaped part; positioning pin b is inserted into the stepped hole, and positioning pin b is sleeved with positioning pin a in the stepped hole, and a washer is provided between the hexagonal screw and positioning pin b. The individual parts are pressed, spliced ​​and locked by the hexagonal screw.

[0014] The positioning block is arranged circumferentially on the base and is fixed by screws;

[0015] The slider has a strip groove at its center and a slide rail on its lower end face. The width of the slide rail corresponds to the width of the positioning block, and the strip groove and the slide rail are connected.

[0016] The slider is mounted on the positioning block and is locked in place by clamping screws;

[0017] The pressure plate is Z-shaped, with one end pressing against the mounting edge of the part, and the other end connected to the positioning block through the slot of the slider by a hexagonal screw.

[0018] The preferred embodiment of the semi-enclosed narrow groove machining process for ring-shaped parts is that the number of positioning pins a, positioning pins b, pressure plates, sliders, and positioning blocks is one less than the number of pin holes on the positioning ring, forming one hole position; the hole position is positioned in the positive X-axis direction, so that the tool can enter from the empty position and participate in cutting.

[0019] The preferred embodiment of the semi-enclosed narrow groove machining process for ring-shaped parts is to use cutting tools of different lengths according to the groove depth of the part, and to machine in sections.

[0020] Compared with the prior art, the present invention has the following beneficial technical effects:

[0021] The technical solution of this invention utilizes the structural characteristics of the part and the spindle orientation function of the CNC lathe to design a process method that enables tool entry from the circumferential gap of the part, replacing the conventional method of tool entry from above the part. This solves the problem of insufficient tool entry space in narrow grooves due to part structural limitations, thus preventing the part from being machined. After applying this method, the machined part has acceptable dimensions and good surface quality, meeting the design requirements. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a single part;

[0023] Figure 2 Schematic diagram of the clamping structure of the dedicated clamping device;

[0024] Figure 3 This is a schematic diagram of the clamping device.

[0025] In the diagram: 1-base, 2-support ring, 3-positioning block, 4-slider, 5-pressure plate, 6-lifting eye screw, 7-positioning pin a, 8-connecting plate, 9-part, 10-positioning pin b, 11-washer. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1-3 The present invention will be described in detail, but the scope of protection of the present invention is not limited by the accompanying drawings.

[0027] A machining process for a semi-enclosed narrow groove in a ring-shaped part includes the following steps:

[0028] Step 1: Install the special clamping device on the CNC lathe, align the datum surface of the device with a runout of 0.01 max, and then tighten the device after alignment;

[0029] Step 2: Install the parts in sequence along the circumference, leaving one empty space unfilled, and prepare the cutting tools at the same time.

[0030] Step 3: Rotate the CNC lathe worktable, align the empty space with the positive X-axis, manually adjust the tool position to ensure that the tool can enter from the reserved empty space, and record the current angular position value of the worktable.

[0031] Step 4: When compiling the CNC program, first position the worktable to the angular position recorded in Step 3, move the tool to perform the feed action, and after completion, start the worktable to rotate forward and perform cutting machining according to the CNC program toolpath.

[0032] Step 5: After machining is completed, reposition the worktable to the angular position recorded in Step 3, stop the worktable rotation, move the tool to perform a retraction action, and end the part machining.

[0033] The special clamping device includes a base 1, a support ring 2, a positioning block 3, a slider 4, a pressure plate 5, and a lifting eye screw 6;

[0034] The base 1 is disc-shaped and has multiple sets of pin holes along the inner circumference. Each set of pin holes is arranged along the circumference. The cylindrical pin is inserted into the pin hole. The support ring 2 is arranged on the base 1 along the outer side of the cylindrical pin and is locked and fixed by the internal hexagonal head screw.

[0035] The support ring 2 is provided with multiple pin holes along its circumference. The positioning pin a7 is located at the center of the connecting plate. One end of the positioning pin a7 is inserted into the pin hole of the support ring 2 and fixed to the outer wall of the support ring 2 by the connecting plate 8.

[0036] The other end of the positioning pin a7 is inserted into the stepped hole of the part 9; the positioning pin b10 is inserted into the stepped hole, and the positioning pin b10 is sleeved with the positioning pin a7 in the stepped hole. The end face of the positioning pin b10 is provided with a washer 11. The individual parts 9 are pressed, spliced ​​and locked by hexagonal screws.

[0037] The positioning block 3 is arranged circumferentially on the base 1 and is fixed by screws;

[0038] The slider 4 has a strip groove at its center and a slide rail on its lower end face. The width of the slide rail corresponds to the width of the positioning block 3, and the strip groove and the slide rail are connected.

[0039] The slider 4 is mounted on the positioning block 3 and is locked in place by a clamping screw.

[0040] The pressure plate 5 is Z-shaped, with one end pressing on the mounting edge of the part 9, and the other end connected to the positioning block 3 by passing through the strip groove of the slider 4 with a hexagonal screw.

[0041] The number of positioning pins a7, b10, pressure plate 5, slider 4, and positioning block 3 is one less than the number of pin holes on positioning ring 2, forming one hole position; the hole position is positioned in the positive direction of the X-axis, so that the tool can enter from the empty position and participate in cutting.

[0042] Based on the groove depth of part 9, cutters of different lengths are set up for segmented machining.

[0043] The eye bolts 6 are arranged in three places along the circumference of the base 1.

Claims

1. A machining process for a semi-enclosed narrow groove in annular components of an aero-engine, characterized in that: Includes the following steps: Step 1: Install the special clamping device on the CNC lathe, align the reference surface of the device with a maximum runout of 0.01mm, and then tighten the device after alignment; Step 2: Install the parts in sequence along the circumference, leaving one empty space unfilled, and prepare the cutting tools at the same time. Step 3: Rotate the CNC lathe worktable, align the empty space with the positive X-axis, manually adjust the tool position to ensure that the tool can enter from the reserved empty space, and record the current angular position value of the worktable. Step 4: When compiling the CNC program, first position the worktable to the angular position recorded in Step 3, move the tool to perform the feed action, and after completion, start the worktable to rotate forward and perform cutting machining according to the CNC program toolpath. Step 5: After machining is completed, reposition the worktable to the angular position recorded in Step 3, stop the worktable rotation, move the tool to perform a retraction action, and end the part machining.

2. The machining process for a semi-enclosed narrow groove in an aero-engine ring-shaped part according to claim 1, characterized in that: In step one, the special clamping device includes a base, a support ring, a positioning block, a slider, a pressure plate, and lifting eye screws; The base is disc-shaped and has multiple sets of pin holes along the inner circumference. Each set of pin holes is arranged along the circumference. The cylindrical pin is inserted into the pin hole, and the support ring is arranged on the base along the outer side of the cylindrical pin and is locked and fixed by the internal hexagonal head screw. The support ring is provided with multiple pin holes along its circumference. The positioning pin a is located at the center of the connecting plate. One end of the positioning pin a is inserted into the pin hole of the support ring and fixed to the outer wall of the support ring by the connecting plate. The other end of the positioning pin a is inserted into the stepped hole of the ring-shaped part; positioning pin b is inserted into the stepped hole, and positioning pin b is sleeved with positioning pin a in the stepped hole, and a washer is provided between the hexagonal screw and positioning pin b. The individual parts are pressed, spliced ​​and locked by the hexagonal screw. The positioning block is arranged circumferentially on the base and is fixed by screws; The slider has a strip groove at its center and a slide rail on its lower end face. The width of the slide rail corresponds to the width of the positioning block, and the strip groove and the slide rail are connected. The slider is mounted on the positioning block and is locked in place by clamping screws; The pressure plate is Z-shaped, with one end pressing against the mounting edge of the part, and the other end connected to the positioning block through the slot of the slider by a hexagonal screw.

3. The machining process for a semi-enclosed narrow groove of an aero-engine ring-shaped part according to claim 2, characterized in that: The number of positioning pins a, b, pressure plate, slider, and positioning block is one less than the number of pin holes on the positioning ring, forming one hole position; the hole position is positioned in the positive X-axis direction, so that the tool can enter from the empty position and participate in cutting.

4. The machining process for a semi-enclosed narrow groove of an aero-engine ring-shaped part according to claim 3, characterized in that: Based on the groove depth of the part, cutters of different lengths are set for segmented machining.

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