A milling fixture for hemispherical resonators

Abstract

A milling fixture for a hemispherical resonator includes a base, a limiting seat, a locking inner sleeve, and a locking outer sleeve. The limiting seat is installed in a first threaded hole in the center of the base and is threaded to the first threaded hole via a second external thread at its lower end. The locking inner sleeve is fitted onto a positioning post at the upper end of the limiting seat through a locking hole, with the upper part of the locking inner sleeve extending beyond the positioning post. The locking inner sleeve has a contraction gap along its axial direction. The locking outer sleeve is fitted onto the outer cone of the locking inner sleeve through a tapered hole and is installed in the first threaded hole via a first external thread. The lower end of the center post of the hemispherical resonator to be processed is inserted into the locking hole, ensuring that the bottom surface of the center post is tightly fitted against the top surface of the positioning post. Rotating the locking outer sleeve compresses the contraction gap, causing the locking hole to continuously shrink, clamping the lower end of the center post, and fixing the hemispherical resonator to be processed above the positioning post. A precision quick-change mechanism is fixedly connected below the base. This invention overcomes the shortcomings of the prior art.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mechanical processing, and particularly relates to a hemispherical resonator milling processing tool. BACKGROUND

[0002] The hemispherical resonator gyroscope is widely applied in the fields of inertial navigation, guidance and inertial measurement due to its super stability, high reliability, high precision, long service life, low power consumption and good anti-impact and anti-radiation performance. The quartz hemispherical resonator, as a core component of the hemispherical resonator gyroscope, directly determines the use performance of the hemispherical resonator gyroscope in terms of machining precision and surface quality.

[0003] The hemispherical resonator is made of fused quartz glass material, which is a hard and brittle material. The hemispherical resonator has a thin-walled hemispherical shell shape, and has extremely high size and precision requirements. When semi-finishing is performed by milling, the coaxiality between the center column and the thin-walled hemispherical shell shape needs to be less than or equal to 0.003 mm, the roundness of the thin-walled hemispherical shell shape needs to be less than or equal to 0.002 mm, and the unevenness of the thin-walled hemispherical shell shape needs to be less than or equal to 0.001 mm. Therefore, the machining difficulty is very high. Since the self-precision of the ordinary three-jaw chuck is not high, the high-precision three-jaw chuck cannot meet the high-precision machining requirement, and the high-precision three-jaw chuck has a high cost and cannot limit the installation height of the hemispherical resonator, thereby affecting the production efficiency. SUMMARY

[0004] The application provides a hemispherical resonator milling processing tool to overcome the deficiencies of the prior art.

[0005] The technical scheme adopted by the application is as follows: a hemispherical resonator milling processing tool, comprising a base, a limiting seat, a locking inner sleeve and a locking outer sleeve, the base is provided with a first threaded hole in the center, the limiting seat is provided with a second external thread at the lower part and a positioning column coaxially arranged with the limiting seat at the upper part, and the diameter of the positioning column is slightly smaller than the outer diameter of the center column of the hemispherical resonator to be machined, and the limiting seat is installed in the first threaded hole through the second external thread; the locking inner sleeve has a tapered shape and is provided with a locking hole in the center and a contraction joint in the axial direction; the locking inner sleeve is sleeved on the positioning column through the locking hole, and the upper part of the locking inner sleeve protrudes above the positioning column; the locking outer sleeve is provided with a tapered hole matched with the shape of the locking inner sleeve in the center and a first external thread on the outer periphery; the locking outer sleeve is sleeved on the outer periphery of the locking inner sleeve through the tapered hole and is installed in the first threaded hole through the first external thread; the center column lower end of the hemispherical resonator to be machined is inserted into the locking hole, and the bottom surface of the center column is tightly attached to the top surface of the positioning column; the locking outer sleeve is rotated to compress the contraction joint to continuously reduce the locking hole, and the center column lower end is clamped, so that the hemispherical resonator to be machined is fixed above the positioning column; and the base is fixedly connected with a precise quick-change mechanism below.

[0006] The precision quick change mechanism comprises a tray, a fixed base and a ring-shaped locking seat, the ring-shaped locking seat is installed in a cylindrical inner cavity of the fixed base, and a ring-shaped recess on an upper end of the ring-shaped locking seat is sleeved with a ring-shaped boss on an outer periphery of a top end of the cylindrical inner cavity; balls are arranged in uniformly distributed grooves on a lower end of the ring-shaped boss, and a gradually shallower arc-shaped groove is arranged on a side wall of the ring-shaped recess corresponding to the balls in a circumferential direction, and the balls are located in the arc-shaped groove; a lower end of the tray is fixedly connected with an upper end of the fixed base, a connecting rod on a bottom center of the tray is inserted into the ring-shaped locking seat from a through hole on a top center of the fixed base, and a ring-shaped recess on a lower part of the connecting rod is arranged opposite to the balls, and the ring-shaped locking seat is rotated, the balls are forced to be clamped into the ring-shaped recess through the arc-shaped groove, and the tray is locked with the fixed base.

[0007] Positioning blocks are arranged on the top end of the fixed base in a circumferential direction, and the positioning blocks are arranged on an outer periphery of the through hole, and positioning grooves corresponding to the positioning blocks and adjustable supports are arranged on a lower end surface of the tray in a one-to-one correspondence, and the positioning blocks are inserted into the positioning grooves, and the adjustable supports are supported on a top surface of the fixed base.

[0008] The fixed base is provided with a connecting hole, and the connecting hole is located on an outer periphery of the first threaded hole, and the tray is provided with a second threaded hole corresponding to the connecting hole, and the fixed base is fixed above the tray through screw thread connection from top to bottom through the connecting hole and the second threaded hole.

[0009] A wrench clamping plane is arranged on an outer periphery of an upper part of the locking sleeve, and a wrench clamping groove is arranged on a top end of the positioning column and a bottom end of the limiting seat.

[0010] Compared with the prior art, the present application has the following beneficial effects:

[0011] 1. The base and the limiting seat are threadedly sleeved, the installation height of the to-be-processed hemispherical resonator can be adjusted and limited, the coaxiality requirement after clamping is ensured through the conical locking mechanism, the problem that the ordinary three-jaw chuck cannot meet the high coaxiality requirement after clamping is overcome, the problem of relatively high cost of the high-precision three-jaw chuck is overcome, the machining precision is ensured, the production cost is reduced, and the production efficiency is improved.

[0012] 2. The precision quick change mechanism is arranged, the clamping time is reduced, the milling machine downtime is reduced through the quick change cooperation of the plurality of trays and the fixed base, the utilization rate of the equipment per unit time is improved, the production efficiency is further improved, the positioning error caused by secondary clamping of the rework parts is reduced, and the yield of the rework parts is improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a three-dimensional structure explosion schematic diagram of the present application;

[0014] Figure 2It is the assembly structure section view schematic diagram of the present application;

[0015] Figure 3 It is Figure 2 The section view at A-A in the figure;

[0016] Figure 4 It is the locking state schematic diagram of the quick change mechanism of the present application. DETAILED DESCRIPTION

[0017] The present application will be described in detail below in combination with the accompanying Figures 1-4 and specific embodiments.

[0018] A hemispherical resonator milling tool, comprising a base 1, a limiting seat 2, a locking inner sleeve 4 and a locking outer sleeve 3, the base 1 is centrally provided with a first threaded hole 1-1, the limiting seat 2 is provided with a second external thread 2-2 at the lower part and a positioning column 2-1 coaxially arranged at the upper part, the diameter of the positioning column 2-1 is slightly smaller than the outer diameter of the center column 5-1 of the hemispherical resonator 5 to be machined, and the limiting seat 2 is installed in the first threaded hole 1-1 through the second external thread 2-2; the locking inner sleeve 4 is tapered in shape and is provided with a contraction joint 4-2 along the axial direction; the locking inner sleeve 4 is sleeved on the positioning column 2-1 through the locking hole 4-1, and the upper part of the locking inner sleeve 4 extends above the positioning column 2-1; the locking outer sleeve 3 is provided with a tapered hole 3-3 matching the shape of the locking inner sleeve 4 at the center and is provided with a first external thread 3-1 at the outer periphery; the locking outer sleeve 3 is sleeved on the outer periphery of the locking inner sleeve 4 through the tapered hole 3-3 and is installed in the first threaded hole 1-1 through the first external thread 3-1; the lower end of the center column 5-1 of the hemispherical resonator 5 to be machined is inserted into the locking hole 4-1, and the bottom surface of the center column 5-1 is tightly attached to the top surface of the positioning column 2-1, the locking outer sleeve 3 is rotated to compress the contraction joint 4-2 to continuously reduce the locking hole 4-1, the lower end of the center column 5-1 is clamped, and the hemispherical resonator 5 to be machined is fixed above the positioning column 2-1; the base 1 is fixedly connected with a precision quick change mechanism below.

[0019] A wrench clamping plane 3-2 is arranged on the upper outer periphery of the locking outer sleeve 3; a wrench clamping groove 2-3 is arranged at the top end of the positioning column 2-1 and the bottom end of the limiting seat 2.

[0020] The present application can satisfy the clamping of hemispherical resonators 5 with different center column heights, specifically, the wrench can be clamped in the wrench clamping groove 2-3 to rotate the limiting seat 2 to move up and down along the first threaded hole 1-1, so as to adjust the hemispherical resonator 5 to the appropriate height to be machined by the tool; then the wrench is clamped on the wrench clamping plane 3-2 to rotate the locking outer sleeve 3 to clamp the center column of the hemispherical resonator 5 to be machined by the locking inner sleeve 4.

[0021] The precision quick change mechanism comprises a tray 6, a fixed seat 7 and a ring-shaped locking seat 8, the ring-shaped locking seat 8 is installed in a cylindrical inner cavity 7-1 of the fixed seat 7, and a ring-shaped recess 8-1 at the upper end of the ring-shaped locking seat 8 is sleeved on the outer periphery of a ring-shaped boss 7-2 at the top end of the cylindrical inner cavity 7-1; a plurality of ball bearings 9 are arranged in a plurality of grooves 7-3 evenly distributed at the lower end of the ring-shaped boss 7-2, and a plurality of arc-shaped grooves 8-2 that gradually become shallow are arranged on the side wall of the ring-shaped recess 8-1 corresponding to the ball bearings 9, and the ball bearings 9 are located in the arc-shaped grooves 8-2; the upper end of the tray 6 is fixedly connected to the lower end of the base 1, a connecting rod 6-1 at the bottom of the tray 6 is inserted into the ring-shaped locking seat 8 from a through hole 7-4 at the center of the top end of the fixed seat 7, and a ring-shaped groove 6-2 at the lower part of the connecting rod 6-1 is arranged opposite to the ball bearings 9, and the ring-shaped locking seat 8 is rotated, the ball bearings 9 are forced to be clamped into the ring-shaped groove 6-2 along the grooves 7-3 through the arc-shaped grooves 8-2, and the tray 6 and the fixed seat 7 are locked.

[0022] In an embodiment, positioning blocks 7-5 are evenly distributed in the circumferential direction at the top end of the fixed seat 7, and the positioning blocks 7-5 are arranged on the outer periphery of the through hole 7-4, a plurality of positioning grooves 6-3 corresponding to the positioning blocks 7-5 and adjustable supports 6-4 are evenly distributed on the lower end surface of the tray 6, the positioning blocks 7-5 are inserted into the positioning grooves 6-4, and the lower ends of the adjustable supports 6-4 are supported on the top surface of the fixed seat 7. The mounting position of the positioning blocks 7-5 and the positioning grooves 6-3 does not change before and after disassembly and assembly, the repeated positioning accuracy is ensured, and the center column of the hemispherical resonator 5 is perpendicular to the working table surface of the milling machine by adjusting the adjustable supports 6-4.

[0023] In an embodiment, a connecting hole 1-2 is arranged on the base 1, and the connecting hole 1-2 is located on the outer periphery of the first threaded hole 1-1, a second threaded hole 6-5 corresponding to the connecting hole 1-2 is arranged on the top surface of the tray 6, and a screw 11 is screwed from top to bottom through the connecting hole 1-2 and the second threaded hole 6-5 to connect the base 1 to the top of the tray 6.

[0024] After the locking outer sleeve 3 and the locking inner sleeve 4 are conically sleeved, and the locking outer sleeve 3 and the base 1 are connected by the precision thread, the coaxiality error of the locking inner sleeve 4 is less than 0.003 mm, and the coaxiality machining precision of the hemispherical resonator is less than 0.003 mm.

[0025] In use, the fixing seat 7 is first fixed on the milling machine worktable, in order to improve production efficiency, at least two sets of the base 1 and the tray 6 are prepared, and the tray 6 and the base 1 are fixed together to form a first set and a second set. The first set is quickly inserted into the fixing seat 7, the adjustable support 6-4 is adjusted to make the threaded hole on the base 1 perpendicular to the milling machine worktable, and then the adjustable support 6-4 is locked, then the first set and the fixing seat 7 are locked and fixed by the handle 10, the installation position of the tray 6 and the fixing seat 7 is marked, and then the handle 10 is pushed in reverse to take down the first set; then the second set is quickly inserted into the fixing seat 7 according to the above method and locked and fixed by the handle 10, the center column 5-1 of the hemispherical resonator 5 is inserted into the locking inner sleeve 4, the bottom surface of the center column 5-1 is tightly attached to the top surface of the limiting column, and the center column is tightly held by rotating the locking outer sleeve 3; the hemispherical resonator 5 is semi-finished by starting the milling machine, the hemispherical resonator 5 and the second set are taken off from the fixing seat 7 after milling, then the first set is inserted into the fixing seat 7, the mark is matched to ensure that the threaded hole of the base 1 is perpendicular to the milling machine worktable, the handle 10 is pushed to lock and fix, then the hemispherical resonator 5 is clamped and semi-finished by the same method, the hemispherical resonator 5 and the first set are taken off from the fixing seat 7 after milling. After inspection, the hemispherical resonator 5 is taken off, the next one is clamped, and the unqualified one is returned for repair, the clamping method is the same as above, the positioning error of secondary clamping is eliminated, and the yield of repaired products is improved. Through the quick change of two sets of tooling, the clamping time is reduced, the milling equipment downtime during inspection is reduced, and the utilization rate of the equipment per unit time is improved.

[0026] The above embodiments are only preferred embodiments of the present application, and are not intended to limit the scope of the application. Any equivalent changes made according to the description of the claims of the present application shall be included within the scope of the claims of the present application.

Claims

1. A hemispherical resonator milling tooling apparatus, characterized by: The utility model relates to a kind of precision quick-change mechanism and its processing method, including base (1), limiting seat (2), locking inner sleeve (4), locking outer sleeve (3), the base (1) central first threaded hole (1-1) has, the limiting seat (2) lower portion second outer thread (2-2) has, upper portion has with the coaxial arrangement of limiting seat (2) positioning column (2-1), and the diameter of positioning column (2-1) is slightly smaller than the outer diameter of the center column (5-1) of the hemispherical resonator (5) to be processed, the limiting seat (2) is installed in first threaded hole (1-1) by second outer thread (2-2);The locking inner sleeve (4) is conical in appearance, with locking hole (4-1) in the center, and is provided with shrinkage joint (4-2) along the axial direction;The locking inner sleeve (4) is sleeved on positioning column (2-1) by locking hole (4-1), and locking inner sleeve (4) upper portion extends above positioning column (2-1);The locking outer sleeve (3) is provided with the taper hole (3-3) of the conformation adaptation of locking inner sleeve (4) in the center, and the outer periphery has first outer thread (3-1);The locking outer sleeve (3) is sleeved on the outer periphery of locking inner sleeve (4) by taper hole (3-3), and is installed in first threaded hole (1-1) by first outer thread (3-1);The lower end of the center column (5-1) of the hemispherical resonator (5) to be processed is inserted in locking hole (4-1), and the bottom surface of center column (5-1) is closely attached to the top surface of positioning column (2-1), rotates locking outer sleeve (3) and compresses shrinkage joint (4-2) to make locking hole (4-1) continuously reduce, the lower end of center column (5-1) is clamped, and the hemispherical resonator (5) to be processed is fixed above positioning column (2-1);The base (1) is fixedly connected with precision quick-change mechanism below.

2. The hemispherical resonator milling tooling according to claim 1, wherein: The precision quick-change mechanism includes tray (6), fixed seat (7) and annular locking seat (8), the annular locking seat (8) is installed in the cylindrical inner cavity (7-1) of fixed seat (7), and the annular recess (8-1) of annular locking seat (8) upper end is sleeved on the periphery of annular boss (7-2) that cylindrical inner cavity (7-1) top end has;The lower end of annular boss (7-2) is evenly distributed in the groove (7-3) and is provided with ball (9), and the side wall of annular recess (8-1) corresponding to ball (9) is circumferentially evenly distributed with gradually shallow arc-shaped groove (8-2), and ball (9) is located in arc-shaped groove (8-2);The upper end of tray (6) is fixedly connected with the lower end of base (1), the connecting rod (6-1) of the bottom central tray (6) is inserted in annular locking seat (8) from the through hole (7-4) of the top central fixed seat (7), and the annular recess (6-2) of the lower part of connecting rod (6-1) is oppositely arranged with ball (9), rotates annular locking seat (8), and ball (9) is forced to enter annular recess (6-2) along groove (7-3) by arc-shaped groove (8-2), and tray (6) is locked with fixed seat (7).

3. The hemispherical resonator milling tooling according to claim 2, wherein: Positioning blocks (7-5) are arranged on the top end of the fixing seat (7) in a circumferential distribution, and the positioning blocks (7-5) are arranged on the periphery of the through hole (7-4), the lower end surface of the tray (6) is uniformly distributed with positioning grooves (6-3) and adjustable supports (6-4) corresponding to the positioning blocks (7-5) in one-to-one correspondence, and the positioning blocks (7-5) are inserted into the positioning grooves (6-4), and the lower end of the adjustable support (6-4) is supported on the top surface of the fixing seat (7).

4. The hemispherical resonator milling tooling of claim 3, wherein: The base (1) is provided with a connecting hole (1-2), and the connecting hole (1-2) is located on the periphery of the first threaded hole (1-1), the top surface of the tray (6) is provided with a second threaded hole (6-5) corresponding to the connecting hole (1-2), and the base (1) is fixed above the tray (6) by screwing a screw (11) from top to bottom through the connecting hole (1-2) and the second threaded hole (6-5).

5. The hemispherical resonator milling tooling of claim 1 or 2 or 3 or 4, wherein: A wrench clamping plane (3-2) is arranged on the outer periphery of the upper portion of the locking sleeve (3); the top end of the positioning column (2-1) and the bottom end of the limiting seat (2) are both provided with a wrench clamping groove (2-3).

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