Machining process method for semi-closed narrow groove of ring section type part

Abstract

The invention relates to a machining process method for a semi-closed narrow groove of a ring section type part. The machining process method comprises the steps that firstly, a special clamping device is installed on a numerical control lathe; 2, parts are sequentially installed in the circumferential direction; thirdly, a numerical control lathe workbench is rotated, the vacancy is aligned with the forward direction of the X axis, and the position of a tool is manually adjusted; 4, programming a numerical control program; and fifthly, after machining is completed, the workbench is positioned to the angular position recorded in the third step again, the workbench stops rotating, the tool is moved to retract, and part machining is finished. Cutter feeding from a gap between two parts is achieved, and narrow groove structure machining is achieved. The machined part is qualified in size and good in surface quality, and the design requirement is met.

Description

Technical Field

[0001] The invention relates to the technical field of aero-engines, and in particular to a method for machining a semi-enclosed narrow groove of a ring segment part. Background Art

[0002] Ring segment parts structure Figure 1 , maximum diameter of the part The height is 104mm, the wall thickness is 3mm, and the chord length is 63.5mm. One end of the part has a semi-closed groove structure, the groove width is 3mm, and the groove depth along the radial direction of the part is 7.8mm. L-shaped blades should be used for processing. The radial width at the opening is 7.1mm, which is smaller than the groove depth and the required width of the tool. The tool feed conditions are not met and the part cannot be processed. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a method for processing semi-enclosed narrow grooves of ring segment parts; the specific technical solution is as follows:

[0004] A method for machining a semi-enclosed narrow groove of a ring segment part comprises the following steps:

[0005] Step 1: Install a special clamping device on the CNC lathe, align the device reference surface to 0.01max, and clamp the device after alignment;

[0006] Step 2: Install the parts in order along the circumferential direction, leaving one empty position without installing any parts, and prepare for tool installation at the same time;

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

[0008] Step 4: When compiling the NC program, first position the workbench to the angular position recorded in step 3, move the tool to perform the feed action, and after completion, start the workbench to rotate forward, and perform cutting according to the tool path trajectory of the NC program;

[0009] Step 5: After the processing is completed, the workbench is positioned again to the angular position recorded in step 3, the workbench stops, and the tool is moved to retract, thereby completing the part processing.

[0010] The preferred embodiment of the semi-enclosed narrow groove processing method for ring segment parts is that in step 1, 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 is provided with a plurality of groups of pin holes along the circumference of the inner ring, and each group of pin holes is arranged along the circumference; the cylindrical pins are inserted into the pin holes, and the support ring is arranged on the base along the outer side of the cylindrical pins, and is locked and fixed by hexagon socket head screws;

[0012] The support ring is provided with a plurality of pin holes along the circumference, and the positioning pin a is provided 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 through the connecting plate;

[0013] The other end of the positioning pin a is inserted into the step hole of the ring-like part; the positioning pin b is inserted into the step hole, and the positioning pin b is sleeved with the positioning pin a in the step hole, and a washer is provided between the hexagonal screw and the positioning pin b, and the single part is pressed, spliced, locked and fixed by the hexagonal screw;

[0014] The positioning blocks are arranged on the base along the circumference and are fixed by screws;

[0015] The center of the slider is provided with a strip groove, and the lower end surface is provided with a slideway, the width of which corresponds to the width of the positioning block, and the strip groove and the slideway are connected;

[0016] The sliding block is arranged on the positioning block and is locked and fixed by a clamping screw;

[0017] The pressing plate is in a Z shape, one end of which is pressed on the mounting edge of the part, and the other end is connected to the positioning block through a hexagonal screw passing through the strip groove of the sliding block.

[0018] The described method for processing semi-closed narrow grooves in ring segment parts has an optimal solution as follows: the number of the locating pins a, locating pins b, pressure plates, sliders, and locating blocks is one less than the pin holes on the locating ring, forming a hole position; the hole position is positioned to the positive direction of the X-axis, so that the tool can feed from the empty position and participate in cutting.

[0019] The preferred solution of the semi-enclosed narrow groove processing method for segment-type parts is to set tools of different lengths according to the groove depth dimensions of the parts and process them in sections.

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

[0021] The technical solution of the present invention utilizes the structural characteristics of the parts and the spindle orientation function of the CNC lathe to design a process method to achieve feeding from the empty space of the parts in the circumferential direction, instead of the conventional method of feeding from the top of the parts, solving the problem of no feeding space in the narrow grooves and the inability to process the parts due to the structural limitations of the parts. After the application of this method, the parts are processed to meet the required dimensions and good surface quality, meeting the design requirements. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] Figure 2 It is a schematic diagram of the clamping structure of the special clamping device;

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

[0025] In the figure: 1-base, 2-support ring, 3-positioning block, 4-slider, 5-pressure plate, 6-eye screw, 7-positioning pin a, 8-connecting plate, 9-parts, 10-positioning pin b, 11-washer. DETAILED DESCRIPTION

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

[0027] A method for machining a semi-enclosed narrow groove of a ring segment part comprises the following steps:

[0028] Step 1: Install a special clamping device on the CNC lathe, align the device reference surface to 0.01max, and clamp the device after alignment;

[0029] Step 2: Install the parts in order along the circumferential direction, leaving one empty position without installing any parts, and prepare for tool installation at the same time;

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

[0031] Step 4: When compiling the NC program, first position the workbench to the angular position recorded in step 3, move the tool to perform the feed action, and after completion, start the workbench to rotate forward, and perform cutting according to the tool path trajectory of the NC program;

[0032] Step 5: After the processing is completed, the workbench is positioned again to the angular position recorded in step 3, the workbench stops, and the tool is moved to retract, thereby completing the part processing.

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

[0034] The base 1 is disc-shaped, and is provided with a plurality of groups of pin holes along the circumference of the inner ring, and each group of pin holes is arranged along the circumference; the cylindrical pins are inserted into the pin holes, and the support ring 2 is arranged on the base 1 along the outer side of the cylindrical pins, and is locked and fixed by hexagon socket head screws;

[0035] The support ring 2 is provided with a plurality of pin holes along the circumference, and the positioning pin a7 is provided 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 is fixed to the outer wall of the support ring 2 through 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, and the single part 9 is pressed, spliced, locked and fixed by a hexagonal screw;

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

[0038] The center of the slider 4 is provided with a strip groove, and the lower end surface is provided with a slideway, the width of which corresponds to the width of the positioning block 3, and the strip groove and the slideway are connected;

[0039] The slider 4 is arranged on the positioning block 3 and is locked and fixed by a clamping screw;

[0040] The pressing 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 through the strip groove of the sliding block 4 via a hexagonal screw.

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

[0042] According to the groove depth of part 9, tools of different lengths are set to process in sections.

[0043] The eyebolts 6 are arranged at three locations along the circumference of the base 1 .

Claims

1. A method for machining a semi-closed narrow groove of a ring segment part, characterized in that: The steps include: Step 1: Install a special clamping device on the CNC lathe, align the device reference surface to 0.01max, and clamp the device after alignment; Step 2: Install the parts in order along the circumferential direction, leaving one empty position without installing any parts, and prepare for tool installation at the same time; Step 3: Turn the CNC lathe worktable, align the empty space with the positive direction of the X-axis, manually adjust the tool position to ensure that the tool can feed from the reserved space, and record the current worktable angular position value; Step 4: When compiling the NC program, first position the workbench to the angular position recorded in step 3, move the tool to perform the feed action, and after completion, start the workbench to rotate forward, and perform cutting according to the tool path trajectory of the NC program; Step 5: After the processing is completed, the workbench is positioned again to the angular position recorded in step 3, the workbench stops, and the tool is moved to retract, thereby completing the part processing.

2. A method for machining a semi-enclosed narrow groove of a ring segment part according to claim 1, characterized in that: In step 1, the special clamping device includes a base, a support ring, a positioning block, a slider, a pressure plate and a lifting eye screw; The base is disc-shaped, and is provided with a plurality of groups of pin holes along the circumference of the inner ring, and each group of pin holes is arranged along the circumference; the cylindrical pins are inserted into the pin holes, and the support ring is arranged on the base along the outer side of the cylindrical pins, and is locked and fixed by hexagon socket head screws; The support ring is provided with a plurality of pin holes along the circumference, and the positioning pin a is provided 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 through the connecting plate; The other end of the positioning pin a is inserted into the step hole of the ring-like part; the positioning pin b is inserted into the step hole, and the positioning pin b is sleeved with the positioning pin a in the step hole, and a washer is provided between the hexagonal screw and the positioning pin b, and the single part is pressed, spliced, locked and fixed by the hexagonal screw; The positioning blocks are arranged on the base along the circumference and are fixed by screws; The center of the slider is provided with a strip groove, and the lower end surface is provided with a slideway, the width of which corresponds to the width of the positioning block, and the strip groove and the slideway are connected; The sliding block is arranged on the positioning block and is locked and fixed by a clamping screw; The pressing plate is in a Z shape, one end of which is pressed on the mounting edge of the part, and the other end is connected to the positioning block through a hexagonal screw passing through the strip groove of the sliding block.

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

4. A method for machining a semi-enclosed narrow groove of a ring segment part according to claim 3, characterized in that: According to the groove depth of the part, tools of different lengths are set to process in sections.

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