CN214053755U

CN214053755U - Fine boring tool

Info

Publication number: CN214053755U
Application number: CN202022832025.1U
Authority: CN
Inventors: 杨华; 周健; 江训协; 钟志伟
Original assignee: Jiujiang Precision Measuring Technology Research Institute
Current assignee: Jiujiang Precision Measuring Technology Research Institute
Priority date: 2020-12-01
Filing date: 2020-12-01
Publication date: 2021-08-27
Anticipated expiration: 2030-12-01

Abstract

The utility model provides a finish boring frock, includes the base, be equipped with base fixed orifices and screw on the base up end, still be equipped with the square boss that is used for supporting thin wall frame on the base up end, be equipped with the frame fixed orifices on the square boss, thin wall frame upper end is equipped with compresses tightly the subassembly, compress tightly the subassembly and include the concora crush board, the concora crush board is equipped with the heavy nest that is used for installing the steel ball under the concora crush board through double-end screw and base fixed connection, the middle part of the both sides terminal surface of concora crush board is equipped with the recess of upper and lower through type, is equipped with the waist groove of upper and lower through type on the up end of concora crush board, double-end screw's upper end is fixed with the waist groove through gland nut and gasket, and double-end screw's lower extreme is fixed in the screw on the base. The utility model discloses effectively reduce the clamping and warp, avoid cutting vibration, improve clamping stability, solved the problem that thin wall frame clamping warp and processing vibration.

Description

Fine boring tool

Technical Field

The utility model relates to a finish boring frock, concretely relates to finish boring frock that aluminum alloy thin wall frame used.

Background

The new generation of aviation products has the typical technical characteristics of high precision, light weight and high reliability, and the aluminum alloy materials are widely applied to achieve the effects of weight reduction, thin wall and high strength. The wall thickness of the milled small aluminum alloy frame is 5-8 mm, the thinnest part of the groove structure on the frame is 1-2 mm in thickness, and the aluminum alloy frame has the advantages of high strength, light weight and the like and is a typical type of aluminum alloy thin-wall parts.

The fine boring is a key process of frame machining and plays a decisive role in machining precision. The clamping method of the fine boring is an important factor influencing the processing quality, the conventional clamping method is that the lower ends of a plurality of equal-height supporting frames are separated to process positioning surfaces, and the upper ends of the frames are clamped and fixed by a plurality of independent small pressing plates.

However, the aluminum alloy thin-wall frame part has the characteristics of poor rigidity, high precision and difficult processing, the aluminum alloy thin-wall frame part is clamped by a conventional method, if the clamping force is larger, the aluminum alloy thin-wall frame is easy to be extruded and deformed, and if the clamping force is smaller, the phenomenon of tool shaking and even workpiece movement is easy to occur, so that the dimensional precision and the shape/position precision of the frame hole, the hole system axis, the end surface and the inner end surface cannot meet the micron-scale processing requirement.

SUMMERY OF THE UTILITY MODEL

The utility model discloses its aim at provides a finish boring frock to solve the problem in the above-mentioned background art.

The technical scheme who takes for realizing above-mentioned purpose is, a fine boring frock, which comprises a base, be equipped with base fixed orifices and screw on the base up end, still be equipped with the square boss that is used for supporting thin-walled frame on the base up end, be equipped with the frame fixed orifices on the square boss, thin-walled frame upper end is equipped with compresses tightly the subassembly, compress tightly the subassembly and include the concora crush plate, the concora crush plate is equipped with the heavy nest that is used for installing the steel ball through double-end screw and base fixed connection on the concora crush plate lower extreme face, and the middle part of the both sides terminal surface of concora crush plate is equipped with the recess of through-going from top to bottom, is equipped with the waist groove of through-going from top to bottom on the concora crush plate's up end, double-end screw's upper.

Furthermore, a plurality of square bosses are arranged on the upper end face of the base, the upper end faces of the square bosses jointly support a processing positioning face at the lower end of the thin-wall frame, and the height of each square boss is larger than the height difference between the processing positioning face on the thin-wall frame and the lower end face of the frame boss at the lower end of the thin-wall frame.

Furthermore, a plurality of 90-degree sinking nests are arranged on the lower end face of the flat pressing plate, steel balls are arranged in the sinking nests, and the flat pressing plate presses the steel balls to clamp the thin-wall frame.

Advantageous effects

Compared with the prior art, the utility model has the following advantages.

1. In the utility model, the parallelism tolerance of the upper end surface and the lower end surface of the base reaches the micron order, and the narrow processing positioning surface of the separation recess on the frame is transferred to the lower end surface of the base through the high-precision matching of the end surface of the boss on the upper end of the base and the processing positioning surface of the lower end of the thin-wall frame, thereby ensuring the processing positioning stability;

2. the flat pressing plate in the pressing assembly presses the thin-wall frame through the steel balls as a whole, when the double-head screw and the pressing nut are locked, the contact area of each pressing point at the upper end of the thin-wall frame is small, the frame is only pressed by pressing force vertical to a processing positioning surface and is stressed in a balanced manner, the pressing plate can be prevented from directly driving parts to generate distortion, and the deformation of the frame caused by clamping force is reduced to the maximum extent;

3. the utility model has simple structure, economy and feasibility; practice proves that: the machining precision of the aluminum alloy thin-wall frame after finish boring is detected to be qualified by the three-coordinate measuring machine, and the clamping requirement of finish boring of the thin-wall frame can be guaranteed.

Drawings

The present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of the fine boring tool mounting frame of the present invention;

FIG. 2 is a front view of the base of the present invention;

fig. 3 is a top view of the base of the present invention;

fig. 4 is a bottom view of the flat pressing plate of the present invention;

FIG. 5 is a front view of the flat pressing plate of the present invention;

FIG. 6 is a schematic structural view of a frame to be processed according to the present invention;

shown in the figure: 1-base, 2-pressing component, 3-thin wall frame, 21-flat pressing plate, 22-steel ball, 23-double-head screw, 24-pressing nut, 25-gasket, 11-square boss, 12-frame fixing hole, 13-fixing hole, 14-screw hole, 211-groove, 212-waist groove, 213-sinking nest, 31-processing positioning surface and 32-frame boss.

Detailed Description

The present invention will be further described with reference to the following embodiments and the accompanying drawings.

The utility model provides a fine boring frock, includes base 1, as shown in fig. 1-6, be equipped with base fixed orifices 13 and screw 14 on the base 1 up end, still be equipped with the square boss 11 that is used for supporting thin-walled frame 3 on the base 1 up end, be equipped with frame fixed orifices 12 on the square boss 11, thin-walled frame 3 upper end is equipped with compresses tightly subassembly 2, compress tightly subassembly 2 including flat clamp 21, flat clamp 21 is through double-end screw 23 and base 1 fixed connection, is equipped with the heavy nest 213 that is used for installing steel ball 22 on the flat clamp 21 lower terminal surface, and the middle part of the both sides terminal surface of flat clamp 21 is equipped with the recess 211 of through-type from top to bottom, is equipped with the waist groove 212 of through-type from top to bottom on the up end of flat clamp 21, the upper end of double-end screw 23 is fixed with waist groove 212 through gland nut 24 and gasket 25, and the lower extreme of double-end screw 23 is fixed in screw 14 on base 1.

The upper end face of the base 1 is provided with a plurality of square bosses 11, the upper end faces of the square bosses 11 support a processing positioning face 31 at the lower end of the thin-wall frame 3 together, and the height dimension of the square bosses 11 is larger than the height difference between the processing positioning face 31 on the thin-wall frame 3 and the lower end face of a frame boss 32 at the lower end of the thin-wall frame 3.

The lower end face of the flat pressing plate 21 is provided with a plurality of 90-degree sinking nests 213, the steel balls 22 are placed in the sinking nests 213, and the flat pressing plate 21 presses the steel balls 22 to clamp the thin-wall frame 3.

The utility model discloses in, the processing locating surface 31 of the up end supporting thin wall frame 3 lower extreme of base 1 top boss 11 to assemble base 1 and thin wall frame 3 into an organic whole through frame fixed orifices 12 with the screw, flat clamp plate 21 point presses thin wall frame 3 through steel ball 22, thereby presss from both sides tightly fixedly with it and carries out the finish boring processing.

When the utility model is implemented, the upper end of the base 1 is provided with 4 prescription bosses 11, the length, width and position of the prescription bosses 11 correspond to the 4 processing positioning surfaces 31 at the lower end of the thin-wall frame 3, and the height is slightly larger than the height difference between the processing positioning surface 31 of the thin-wall frame and the lower end surface of the frame boss 32 at the lower end of the thin-wall frame; the upper end faces of the 4 prescription bosses 11 are coplanar and have a parallelism less than 0.003mm with the lower end faces, and 1 frame fixing hole 12 is respectively arranged on the upper end faces of the 4 prescription bosses 11 and used for installing the frame 3; the upper end surface of the base 1 is provided with 2 fixing holes 13 for fixing the base 1 on a machine tool workbench, and 2 screw holes 14 for installing 2 double-head screws 23.

The middle part of the long side surface of the flat pressing plate 21 is provided with a groove 211 for avoiding the frame bosses 32 on the two sides of the thin-wall frame 3, 2 waist grooves 212 are processed on the end surface of the flat pressing plate 21, the width dimension of each waist groove 212 is determined according to the diameter of the selected double-threaded screw 23, the distance between the waist grooves 212 is larger than the aperture of the thin-wall frame 3 to be processed so as to avoid the double-threaded screw 23 from interfering with a boring cutter, 4 90-degree sinking nests 213 are processed on the lower end surface of the flat pressing plate 21, and the position dimension corresponds to the 4 90-degree frame process sinking nests on the four corners of the upper end surface of the thin-wall frame 3.

The thin-wall frame 3 is an ellipsoidal O-shaped frame, 4 groups of holes with the requirements of size and geometric tolerance and corresponding end surfaces (or inner end surfaces) are to be finely bored, frame bosses 32 are arranged at the upper end and the lower end of each hole, 4 90-degree frame process sinking nests are machined on 4 small planes at four corners of the upper end of the thin-wall frame 3 and used for positioning the steel ball 22, and 4 small planes at four corners of the lower end of the thin-wall frame 3 are machined positioning surfaces 31.

The processing positioning surface 31 at the 4 positions of the lower end of the thin-wall frame 3 is arranged on the upper end surfaces of the 4 square bosses 11 at the upper end of the base 1, and screws are screwed diagonally. The base 1 and the thin-wall frame 3 are arranged on a workbench of a horizontal machining center and provided with screws, and the screws are screwed tightly for fastening after the subsequent adjustment in place. 4 steel balls 22 are respectively placed in 4 90-degree frame process sinking nests at four corners of the upper end of the thin-wall frame 3, the steel balls 22 are pressed by a flat pressing plate 21 in the pressing component 2 in a point mode (the steel balls are aligned to the corresponding sinking nests on the flat pressing plate), the double-headed screw 23 penetrates through a waist groove 212 of the flat pressing plate 21 and is screwed into a screw hole 14 on the step surface of the upper end of the base 1 and is fastened by a pressing nut 24 and a gasket 25.

And (3) sucking the dial gauge seat on a main shaft of the horizontal machining center, straightening one end of the thin-wall frame 3 by striking a gauge to finish-bore the end face, and screwing a fastening screw connected with a T-shaped nut in a T-shaped groove of a machine tool workbench on the base 1 after adjusting the end face to the finish-bored end face.

And (3) attaching the head of the dial gauge on the surface to be processed of the thin-wall frame 3, measuring the change of the reading of the dial gauge before and after the locking and pressing nut 24, wherein the change value is controlled within 0.005mm, and indicating that the clamping deformation of the thin-wall frame 3 in the state meets the processing requirement.

And (3) correction: and (3) calibrating one end hole and the end face of the thin-wall frame 3, determining 4 groups of holes and the corresponding end face (or inner end face) coordinate positions according to the drawing size, calibrating the other 3 groups of holes and the corresponding end face (or inner end face), ensuring the hole axis coaxiality requirement and the end face (or inner end face) symmetry requirement, and aligning the center of the part.

Claims

1. The fine boring tool comprises a base (1) and is characterized in that a base fixing hole (13) and a screw hole (14) are formed in the upper end face of the base (1), a square boss (11) used for supporting a thin-wall frame (3) is further arranged on the upper end face of the base (1), a frame fixing hole (12) is formed in the square boss (11), a pressing component (2) is arranged at the upper end of the thin-wall frame (3), the pressing component (2) comprises a flat pressing plate (21), the flat pressing plate (21) is fixedly connected with the base (1) through a double-end screw (23), a sinking nest (213) used for mounting a steel ball (22) is arranged on the lower end face of the flat pressing plate (21), an upper through groove (211) and a lower through groove are formed in the middle parts of the end faces of the two sides of the flat pressing plate (21), an upper through waist groove (212) and a lower through groove are formed in the upper end face of the flat pressing plate (21), the upper end of the double-end screw (23) is fixed with the waist groove (212) through a pressing nut (24) and a gasket (25), the lower end of the double-thread screw rod (23) is fixed in a screw hole (14) on the base (1).

2. The fine boring tool according to claim 1, characterized in that a plurality of square bosses (11) are arranged on the upper end face of the base (1), the upper end faces of the square bosses (11) jointly support a machining positioning face (31) at the lower end of the thin-wall frame (3), and the height of each square boss (11) is larger than the height difference between the machining positioning face (31) on the thin-wall frame (3) and the lower end face of a frame boss (32) at the lower end of the thin-wall frame (3).

3. The fine boring tool as claimed in claim 1, wherein the lower end face of the flat pressing plate (21) is provided with a plurality of 90-degree sinking nests (213), the steel balls (22) are placed in the sinking nests (213), and the flat pressing plate (21) presses the steel balls (22) to clamp the thin-wall frame (3).