Milling machine fixture suitable for machining thin-wall ring block type parts and using method of milling machine fixture

Abstract

The invention relates to a milling machine fixture suitable for machining thin-wall ring block type parts and a using method of the milling machine fixture. A support, a radial positioning block, an axial positioning block and a reference positioning block are all arranged on a bottom plate; an angular positioning hole is formed in the center of the radial positioning block and used for being matched with an angular positioning pin. The radial positioning blocks are connected with the bottom plate through screws. And the axial positioning block is used for axially positioning the part. And the axial positioning pressing plate is used for axially pressing the part. The radial positioning pressing plate is used for pressing the part in the radial direction. A pin hole is formed in the center of the radial positioning pressing plate 7, and the radial positioning pressing plate 7 is connected with the axial positioning block through a pin shaft and located on the lower side of a pressing part according to the lever principle. And the radial compression screw is used for radially compressing the part. According to the clamp, the clamping rigidity in the milling process of the thin-wall ring block type part is effectively improved, vibration of the part in the machining process is avoided, and the quality stability is improved.

Description

Technical Field

[0001] The invention relates to the technical field of milling processing of thin-walled ring block parts, and in particular to a milling machine fixture suitable for processing thin-walled ring block parts and a use method thereof. Background Art

[0002] As an important component of rotating products such as aircraft engines and gas turbines, thin-walled ring block parts have the characteristics of wide application range, many structural changes, and great processing difficulty. Since such parts are usually cast parts, the raw material state stability is poor. Therefore, the first processing step is usually the milling process of the processing benchmark. However, due to factors such as the complex structure, irregular shape, and poor rigidity of the thin-walled structure of such parts, it is difficult to clamp them, the clamping rigidity is weak, and the processing is unstable, which in turn causes problems such as large deformation of the parts after processing, unstable processing quality, high tool consumption, and long processing cycle. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a milling machine fixture suitable for processing thin-walled ring block parts and a method of using the same; the specific technical solution is as follows:

[0004] A milling machine fixture suitable for machining thin-walled ring block parts, comprising a base plate, a radial positioning block, an axial positioning block, an angular positioning pin, a reference positioning block, an axial positioning pressure plate, a radial positioning pressure plate, a radial clamping screw, a lateral auxiliary clamping pressure plate, an axial auxiliary jacking screw, a pin support and a support;

[0005] The support, radial positioning block, axial positioning block and reference positioning block are all arranged on the bottom plate;

[0006] The support comprises a mounting seat and a mounting ear seat, wherein the mounting ear seat is arranged on one side of the mounting seat; the support is fixed to one side of the base by screws;

[0007] The upper end surface of the mounting seat is provided with a strip groove and a mounting hole, the center of the mounting ear seat is provided with a mounting groove, and mounting ears are provided on both sides of the mounting groove, and screw holes are provided on the mounting ears for installing radial clamping screws;

[0008] The reference positioning block is installed on the other side of the base corresponding to the support and is fixed to the base by screws;

[0009] The reference positioning block is in a convex shape, and a positioning reference hole is provided on the upper surface for determining the X-axis zero point and the Y-axis zero point of the machining coordinate system;

[0010] The radial positioning block is arranged on the base between the support and the reference positioning block, the outer profile of the radial positioning block is consistent with the inner profile of the thin-walled ring block type part, the inner profile of the thin-walled ring block type part is buckled on the outer profile of the radial positioning block, and the inner profile of the thin-walled ring block type part is completely fitted with the radial positioning block during positioning;

[0011] The upper end of the radial positioning block is provided with a notch, the notch is provided with a screw hole, and the axial auxiliary tightening screw is installed in the screw hole, which is used for axial auxiliary tightening of the inner surface of the upper end of the wall ring block-like parts; the lower end center of the radial positioning block is provided with an angular positioning hole, which is used to cooperate with the angular positioning pin;

[0012] The lower end of the radial positioning block is provided with a bayonet, the side wall is provided with a mounting circular hole, and the pin support is arranged in the mounting circular hole;

[0013] One end of the axial positioning block is clamped in the bayonet of the radial positioning block, and the axial positioning block is locked on the base by screws;

[0014] The center of the axial positioning block is provided with a slot, and the axial direction is provided with a pin hole;

[0015] The radial positioning plate is provided with a pin hole in the middle, which is inserted into the slot of the axial positioning block and connected to the axial positioning block through a pin shaft;

[0016] A tightening screw is arranged on the radial positioning pressure plate, and the radial positioning pressure plate is pressed against the lower side of the thin-walled ring block type part by the tightening screw;

[0017] The angular positioning pin passes through the grid along the outer surface of the thin-walled ring block type part, and is plugged and matched with the angular positioning hole of the radial positioning block, so as to locate the angular direction of the thin-walled ring block type part;

[0018] The center of the lateral auxiliary pressing plate is provided with a pin hole, which is arranged on both sides of the radial positioning block and is connected to the pin support through a pin shaft to fix the lateral auxiliary pressing plate on the radial positioning block;

[0019] A tightening screw is arranged at the lower end of the lateral auxiliary pressing plate, and the lateral auxiliary pressing plate is pressed against the side profile of the thin-walled ring block type part by the tightening screw;

[0020] The axial positioning plate is provided with a U-shaped opening at one end and a strip-shaped opening at the center;

[0021] The axial positioning pressure plate is arranged on the support, and is connected to the mounting seat of the support through bolts passing through the strip-shaped opening. The support is arranged in the strip-shaped opening to support one end of the axial positioning pressure plate.

[0022] The other end of the axial positioning pressure plate is overlapped on the mounting groove of the mounting ear seat, and the end of the axial positioning pressure plate is provided with a notch, which extends out of the mounting groove and is clamped on the angular positioning pin, so as to position and press the thin-walled ring block parts in the axial direction;

[0023] The axial positioning pressure plate can slide back and forth in the strip-shaped opening, and the axial tightening force can be controlled by adjusting the depth of the bolt in the support mounting hole;

[0024] The radial pressing screw passes through the screw hole on the mounting ear to radially press the outer surface of the thin-walled ring block type part.

[0025] The milling machine fixture suitable for machining thin-walled ring block parts, the preferred solution of which is that the upper surface of the reference positioning block is consistent with the height of the axial positioning block, which is used to determine the height reference of the milling machine fixture, that is, the Z-axis zero point of the machining coordinate system;

[0026] The side surface of the reference positioning block is parallel to the center of the angular positioning pin and is used to determine the angular reference of the milling machine fixture, that is, the C-axis zero point of the machining coordinate system.

[0027] The milling machine fixture suitable for processing thin-walled ring block parts has a preferred embodiment in which the height of the axial positioning block is set according to the thin-walled ring block parts to ensure that the lower end surface of the thin-walled ring block parts fits with the end surface of the axial positioning block.

[0028] A method for using a milling machine fixture suitable for machining thin-walled ring block parts comprises the following steps:

[0029] Step 1: Place the thin-walled ring block parts on the axial positioning block to ensure that the inner surface of the parts fits the outer surface of the radial positioning block;

[0030] Step 2: Insert the angular positioning pin into the grid of the thin-walled ring block part, and ensure that the angular positioning pin and the angular positioning hole on the radial positioning block are tightly matched;

[0031] Step 3: Use the axial positioning plate to pre-tighten the thin-walled ring block parts to ensure that the thin-walled ring block parts cannot be shaken manually; at the same time, check the gap between the thin-walled ring block parts and the axial positioning block, and the 0.03mm feeler gauge cannot pass through;

[0032] Step 4: Use radial clamping screws to tighten the outer surface of thin-walled ring block parts; at the same time, check the gap between the thin-walled ring block parts and the radial positioning block. The 0.03mm feeler gauge cannot pass through;

[0033] Step 5: Use radial positioning plate to press thin-walled ring block parts;

[0034] Step 6: Use the axial positioning plate to press the thin-walled ring block parts;

[0035] Step 7: Use the lateral auxiliary clamping plate to assist in clamping thin-walled ring block parts to reduce vibration during part processing;

[0036] Step 8: Use axial auxiliary tightening screws to assist in tightening thin-walled ring block parts to reduce vibration during part processing;

[0037] Step 9. Use a dial indicator to align the reference locating block to determine the part processing coordinate system.

[0038] Step 10: Mill the upper surface of thin-walled ring block parts.

[0039] Beneficial Effects

[0040] Compared with the prior art, the present invention has the following beneficial technical effects:

[0041] The technical solution of the present invention analyzes and understands the structural characteristics of thin-walled ring block parts to determine the main factors affecting the processing quality. According to the structural dimensions of the parts themselves, the positioning, clamping and auxiliary mechanisms of the milling machine fixture are determined. Compared with general fixtures, the application of the present invention greatly improves the clamping rigidity and positioning accuracy of the parts milling process, avoids vibration during part processing, and thus improves processing efficiency and quality stability, reduces tool consumption and processing deformation, and saves costs for the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the structure of a milling machine fixture suitable for processing thin-walled ring block parts;

[0043] Figure 2 A top view of a milling machine fixture suitable for machining thin-walled ring block parts;

[0044] Figure 3 It is a schematic diagram of the distribution of the support block, radial positioning block and reference positioning block on the bottom plate;

[0045] Figure 4 This is a cross-sectional view of a milling machine fixture suitable for machining thin-walled ring block parts;

[0046] Figure 5 This is a schematic diagram of the installation of the lateral auxiliary clamping plate.

[0047] In the figure: 1-base plate, 2-radial positioning block, 3-axial positioning block, 4-angular positioning pin, 5-reference positioning block, 6-axial positioning pressure plate, 7-radial positioning pressure plate, 8-radial clamping screw, 9-lateral auxiliary clamping pressure plate, 10-axial auxiliary clamping screw, 11-pin bracket, 12-support, 13-thin-walled ring block parts, 14-mounting seat, 15-mounting ear seat, 16-strip groove, 17-mounting hole, 18-mounting groove, 19-mounting ear, 20-positioning reference hole, 21-angular positioning hole, 22-bayonet, 23-slot, 24-U-shaped opening, 25-strip opening, 26-pillar. DETAILED DESCRIPTION

[0048] The following is combined with Figure 1-5 The present invention is described in detail, but the protection scope of the present invention is not limited by the accompanying drawings.

[0049] A milling machine fixture suitable for machining thin-walled ring block parts, comprising a base plate 1, a radial positioning block 2, an axial positioning block 3, an angular positioning pin 4, a reference positioning block 5, an axial positioning pressure plate 6, a radial positioning pressure plate 7, a radial clamping screw 8, a lateral auxiliary clamping pressure plate 9, an axial auxiliary jacking screw 10, a pin support 11 and a support 12;

[0050] The support 12, radial positioning block 2, axial positioning block 3 and reference positioning block 5 are all arranged on the bottom plate 1;

[0051] The support 12 includes a mounting seat 14 and a mounting ear seat 15, and the mounting ear seat 15 is arranged on one side of the mounting seat 14; the support 12 is fixed to one side of the base 1 by screws;

[0052] The upper end surface of the mounting seat 14 is provided with a strip groove 16 and a mounting hole 17, the center of the mounting ear seat 15 is provided with a mounting groove 18, and mounting ears 19 are provided on both sides of the mounting groove 18, and the mounting ears 19 are provided with screw holes for installing radial clamping screws 8;

[0053] The reference positioning block 5 is installed on the other side of the base 1 corresponding to the support 12 and is fixed to the base 1 by screws;

[0054] The reference positioning block 5 is in a convex shape, and a positioning reference hole 20 is provided on the upper surface thereof, which is used to determine the X-axis zero point and the Y-axis zero point of the machining coordinate system;

[0055] The radial positioning block 2 is arranged on the base 1 between the support 12 and the reference positioning block 5. The outer surface of the radial positioning block 2 is consistent with the inner surface size of the thin-walled ring block type part 13. The inner surface of the thin-walled ring block type part 13 is buckled on the outer surface of the radial positioning block 2. The inner surface of the thin-walled ring block type part 13 is completely fitted with the radial positioning block 2 during positioning.

[0056] The radial positioning block 2 has a notch at its upper end, a screw hole at the notch, and an axial auxiliary tightening screw 10 installed in the screw hole for axially assisting in tightening the inner surface of the upper end of the thin-walled ring block-like part 13; an angular positioning hole 21 is provided at the center of the lower end of the radial positioning block 2 for matching the angular positioning pin 4;

[0057] The lower end of the radial positioning block 2 is provided with a bayonet 22, and the side wall is provided with a mounting circular hole, and the pin support 11 is arranged in the mounting circular hole;

[0058] One end of the axial positioning block 3 is clamped in the bayonet 22 of the radial positioning block 2, and the axial positioning block 3 is locked on the base 1 by screws;

[0059] The center of the axial positioning block 3 is provided with a slot 23, and the axial direction is provided with a pin hole;

[0060] The radial positioning plate 7 is provided with a pin hole in the middle, which is inserted into the slot 23 of the axial positioning block 3 and connected to the axial positioning block 3 through a pin shaft;

[0061] A tightening screw is provided on the radial positioning pressure plate 7, and the radial positioning pressure plate 7 is pressed against the lower side of the thin-walled ring block-like part 13 by the tightening screw;

[0062] The outer surface of the thin-walled ring block-like part 13 of the angular positioning pin 4 passes through the grid and is plugged into and matched with the angular positioning hole 21 of the radial positioning block 2 to position the angular direction of the thin-walled ring block-like part 13;

[0063] The center of the lateral auxiliary pressing plate 9 is provided with a pin hole, which is arranged on both sides of the radial positioning block 2 and is connected to the pin support 11 through a pin shaft to fix the lateral auxiliary pressing plate 9 on the radial positioning block 2;

[0064] A tightening screw is provided at the lower end of the lateral auxiliary pressing plate 9, and the lateral auxiliary pressing plate 9 is pressed against the side profile of the thin-walled ring block-like part 13 by the tightening screw;

[0065] The axial positioning plate 6 has a notch 24 at one end and a strip opening 25 at the center;

[0066] The axial positioning plate 6 is arranged on the support 12 and connected to the mounting seat 14 of the support 12 by bolts passing through the strip opening 25. The support 26 is arranged in the strip opening 25 to support one end of the axial positioning plate 6.

[0067] The other end of the axial positioning plate 6 is overlapped on the mounting groove 18 of the mounting ear seat 15, and the notch 24 extends out of the mounting groove 18 and is clamped on the angular positioning pin 4, which is used to position and press the thin-walled ring block part 13 in the axial direction;

[0068] The axial positioning pressure plate 6 can slide back and forth in the strip opening 25, and the axial tightening force can be controlled by adjusting the depth of the bolt in the mounting hole 17 of the support 12;

[0069] The radial compression screws 8 pass through the screw holes on the mounting ears 19 to radially compress the outer surface of the thin-walled ring block-like parts 13 .

[0070] The upper surface of the reference positioning block 5 is consistent with the height of the axial positioning block 3, and is used to determine the height reference of the milling machine fixture, that is, the Z-axis zero point of the machining coordinate system;

[0071] The side surface of the reference positioning block 5 is parallel to the center of the angular positioning pin 4, and is used to determine the angular reference of the milling machine fixture, that is, the C-axis zero point of the machining coordinate system.

[0072] The height of the axial positioning block 3 is set according to the thin-walled ring block-like component 13 to ensure that the lower end surface of the thin-walled ring block-like component 13 fits with the end surface of the axial positioning block 3 .

[0073] A method for using a milling machine fixture suitable for machining thin-walled ring block parts comprises the following steps:

[0074] Step 1: Place the thin-walled ring block part 13 on the axial positioning block 3 to ensure that the inner surface of the part 13 fits the outer surface of the radial positioning block 2;

[0075] Step 2: insert the angular positioning pin 4 into the grid of the thin-walled ring block part 13, and ensure that the angular positioning pin 13 and the angular positioning hole on the radial positioning block 2 are tightly matched;

[0076] Step 3: Use the axial positioning plate 6 to pre-tighten the thin-walled ring block part 13, and ensure that the thin-walled ring block part 13 cannot be shaken manually; at the same time, check the gap between the thin-walled ring block part 13 and the axial positioning block 3, and a 0.03mm feeler gauge cannot pass through;

[0077] Step 4: Use radial compression screw 8 to tighten the outer surface of thin-walled ring block part 13; at the same time, check the gap between thin-walled ring block part 13 and radial positioning block 2, and a 0.03mm feeler gauge cannot pass through;

[0078] Step 5: Use the radial positioning plate 7 to press the thin-walled ring block part 13;

[0079] Step 6: Use the axial positioning plate 6 to press the thin-walled ring block part 13;

[0080] Step 7: Use the lateral auxiliary clamping plate 9 to assist in clamping the thin-walled ring block type parts 13 to reduce vibration during part processing;

[0081] Step 8: Use the axial auxiliary tightening screw 10 to assist in tightening the thin-walled ring block part 13 to reduce vibration during part processing;

[0082] Step 9. Use a dial indicator to align the reference positioning block 5 to determine the part processing coordinate system.

[0083] Step 10: milling the upper surface of the thin-walled ring block part 13.

Claims

1. A milling machine fixture suitable for processing thin-walled ring block parts, characterized by: It includes a base plate, a radial positioning block, an axial positioning block, an angular positioning pin, a reference positioning block, an axial positioning pressure plate, a radial positioning pressure plate, a radial clamping screw, a lateral auxiliary clamping pressure plate, an axial auxiliary tightening screw, a pin support and a support; The support, radial positioning block, axial positioning block and reference positioning block are all arranged on the bottom plate; The support comprises a mounting seat and a mounting ear seat, wherein the mounting ear seat is arranged on one side of the mounting seat; the support is fixed to one side of the base by screws; The upper end surface of the mounting seat is provided with a strip groove and a mounting hole, the center of the mounting ear seat is provided with a mounting groove, and mounting ears are provided on both sides of the mounting groove, and screw holes are provided on the mounting ears for installing radial clamping screws; The reference positioning block is installed on the other side of the base corresponding to the support and is fixed to the base by screws; The reference positioning block is in a convex shape, and a positioning reference hole is provided on the upper surface for determining the X-axis zero point and the Y-axis zero point of the machining coordinate system; The radial positioning block is arranged on the base between the support and the reference positioning block, the outer profile of the radial positioning block is consistent with the inner profile of the thin-walled ring block type part, the inner profile of the thin-walled ring block type part is buckled on the outer profile of the radial positioning block, and the inner profile of the thin-walled ring block type part is completely fitted with the radial positioning block during positioning; The upper end of the radial positioning block is provided with a notch, the notch is provided with a screw hole, and the axial auxiliary tightening screw is installed in the screw hole, which is used for axial auxiliary tightening of the inner surface of the upper end of the wall ring block-like parts; the lower end center of the radial positioning block is provided with an angular positioning hole, which is used to cooperate with the angular positioning pin; The lower end of the radial positioning block is provided with a bayonet, the side wall is provided with a mounting circular hole, and the pin support is arranged in the mounting circular hole; One end of the axial positioning block is clamped in the bayonet of the radial positioning block, and the axial positioning block is locked on the base by screws; The center of the axial positioning block is provided with a slot, and the axial direction is provided with a pin hole; The radial positioning plate is provided with a pin hole in the middle, which is inserted into the slot of the axial positioning block and connected to the axial positioning block through a pin shaft; A tightening screw is arranged on the radial positioning pressure plate, and the radial positioning pressure plate is pressed against the lower side of the thin-walled ring block type part by the tightening screw; The angular positioning pin passes through the grid along the outer surface of the thin-walled ring block type part, and is plugged and matched with the angular positioning hole of the radial positioning block, so as to locate the angular direction of the thin-walled ring block type part; The center of the lateral auxiliary pressing plate is provided with a pin hole, which is arranged on both sides of the radial positioning block and is connected to the pin support through a pin shaft to fix the lateral auxiliary pressing plate on the radial positioning block; A tightening screw is arranged at the lower end of the lateral auxiliary pressing plate, and the lateral auxiliary pressing plate is pressed against the side profile of the thin-walled ring block type part by the tightening screw; The axial positioning plate is provided with a U-shaped opening at one end and a strip-shaped opening at the center; The axial positioning pressure plate is arranged on the support, and is connected to the mounting seat of the support through bolts passing through the strip-shaped opening. The support is arranged in the strip-shaped opening to support one end of the axial positioning pressure plate. The other end of the axial positioning pressure plate is overlapped on the mounting groove of the mounting ear seat, and the end of the axial positioning pressure plate is provided with a notch, which extends out of the mounting groove and is clamped on the angular positioning pin, so as to position and press the thin-walled ring block parts in the axial direction; The axial positioning pressure plate can slide back and forth in the strip-shaped opening, and the axial tightening force can be controlled by adjusting the depth of the bolt in the support mounting hole; The radial pressing screw passes through the screw hole on the mounting ear to radially press the outer surface of the thin-walled ring block type part.

2. A milling machine fixture suitable for machining thin-walled ring block parts according to claim 1, characterized in that: The upper surface of the reference positioning block is consistent with the height of the axial positioning block, and is used to determine the height reference of the milling machine fixture, that is, the Z-axis zero point of the machining coordinate system; The side surface of the reference positioning block is parallel to the center of the angular positioning pin and is used to determine the angular reference of the milling machine fixture, that is, the C-axis zero point of the machining coordinate system.

3. A milling machine fixture suitable for machining thin-walled ring block parts according to claim 1, characterized in that: The height of the axial positioning block is set according to the thin-walled ring block type parts to ensure that the lower end surface of the thin-walled ring block type parts fits with the end surface of the axial positioning block.

4. A method for using a milling machine fixture suitable for machining thin-walled ring block parts according to any one of claims 1 to 3, characterized in that: The steps include: Step 1: Place the thin-walled ring block parts on the axial positioning block to ensure that the inner surface of the parts fits the outer surface of the radial positioning block; Step 2: Insert the angular positioning pin into the grid of the thin-walled ring block part, and ensure that the angular positioning pin and the angular positioning hole on the radial positioning block are tightly matched; Step 3: Use the axial positioning plate to pre-tighten the thin-walled ring block parts to ensure that the thin-walled ring block parts cannot be shaken manually; at the same time, check the gap between the thin-walled ring block parts and the axial positioning block, and the 0.03mm feeler gauge cannot pass through; Step 4: Use radial clamping screws to tighten the outer surface of thin-walled ring block parts; at the same time, check the gap between the thin-walled ring block parts and the radial positioning block. The 0.03mm feeler gauge cannot pass through; Step 5: Use radial positioning plate to press thin-walled ring block parts; Step 6: Use the axial positioning plate to press the thin-walled ring block parts; Step 7: Use the lateral auxiliary clamping plate to assist in clamping thin-walled ring block parts to reduce vibration during part processing; Step 8: Use axial auxiliary tightening screws to assist in tightening thin-walled ring block parts to reduce vibration during part processing; Step 9. Use a dial indicator to align the reference locating block to determine the part processing coordinate system. Step 10: Mill the upper surface of thin-walled ring block parts.

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