Roundness correction clamp for laser engraving outer cover

Abstract

The roundness correction clamp comprises an air cylinder, a connecting assembly, a sliding way column, a telescopic rod, a circle supporting pad and a bottom plate, the top of the air cylinder is provided with an air pipe connector and an adjusting screw, a piston rod is arranged in the air cylinder, the connecting assembly is located in the hollow sliding way column, the upper portion of the connecting assembly is connected with the air cylinder, and the connecting assembly is connected with the telescopic rod through a hanging lug. A plurality of linear slideways are cut out of a slideway column shell, a hanging lug on the outer side of a connecting assembly longitudinally slides in the slideways and is connected with the connecting assembly and a circle supporting pad through a double-end hinge, and a supporting seat with a hole maintains horizontal movement of a telescopic rod; the circle supporting pad is in direct contact with the outer cover and has a certain radian. And the bottom plate is flower-shaped and is used for bearing the weight of parts. When the roundness correction clamp is used in the laser engraving machining process, the engraving pen can be positioned more accurately, the machining precision requirement is met, on the other hand, roundness correction sizes of different radius specifications can be achieved by adjusting the air pressure of the air cylinder, and the application range of the roundness correction clamp is widened.

Description

Technical Field

[0001] The invention belongs to the technical field of correction fixtures and is suitable for laser engraving processing of annular components in the aerospace industry, in particular to a circular correction fixture for a laser engraved outer cover. Background Art

[0002] The parts processing in the aerospace field has high requirements for dimensional accuracy and positional accuracy, and no scratches are allowed on the surface. The use of laser engraving equipment can meet the requirements of precision parts processing. Before chemical milling, the parts need to be immersed in a protective glue liquid to evenly coat the surface with a layer of protective glue film, and then the laser engraving operation is performed to etch the protective glue on the surface of the parts according to the tool position set by the program. For annular outer cover parts with thin outer wall thickness, soft material, and easy deformation, they need to be clamped and fixed during the laser engraving process. Once the circle is not calibrated correctly, the tool position will be offset and cannot meet the accuracy requirements of subsequent chemical milling.

[0003] The annular outer cover parts need to be clamped before laser engraving, and a circular calibration fixture with the appropriate size is required. At present, the circular calibration fixture size at the production site needs to be customized according to different part numbers. The cost of making multiple types of fixtures is high, and the fixture needs to be replaced when processing different parts, which affects the production efficiency on site. Summary of the invention

[0004] The present invention aims to provide a rounding fixture for laser engraving outer covers, which can meet the rounding requirements of annular outer covers of different specifications, reduce the manufacturing cost of the fixture, improve the efficiency of the rounding process, and meet the requirements of subsequent laser engraving.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A rounding fixture for a laser engraved cover, comprising:

[0007] cylinder;

[0008] The slide column is a hollow cylindrical shell, the upper end surface of the slide column is provided with a through hole, the piston rod of the cylinder is inserted into the through hole, the cylindrical surface of the slide column is provided with a plurality of straight slideways connected to the hollow inner cavity of the slide column, and the slideways are parallel to the cylindrical surface generatrix of the slide column;

[0009] A connecting assembly, wherein the connecting assembly is slidably connected in the hollow inner cavity of the slide column, the connecting assembly is a cylindrical shell, and the piston rod of the cylinder passes through the through hole of the slide column and is connected to the upper end of the connecting assembly;

[0010] A telescopic rod, wherein a first end of the telescopic rod is hinged on a cylindrical surface of the connecting assembly, and a second end of the telescopic rod is hinged on an inner side surface of a rounding pad, and an outer side surface of the rounding pad serves as a rounding surface for correcting the roundness of the outer cover;

[0011] The bottom plate has an upper end connected to the lower end of the slide column, and a support seat is also arranged on the bottom plate. A plurality of support seats are distributed on the outside of the slide column, and the telescopic rod is slidably connected in the support seat.

[0012] As an option, a hanging ear is provided on the cylindrical surface of the connecting assembly, the hanging ear protrudes outward along the radial direction of the cylindrical surface and extends into the slideway, and the first end of the telescopic rod is hinged to the hanging ear.

[0013] As an option, a sleeve is provided on the upper end surface of the connecting assembly, and the piston rod of the cylinder passes through the through hole of the slide column and is inserted into the sleeve.

[0014] As an option, the first end of the telescopic rod is hinged to the hanging ear through a double-head hinge.

[0015] As an option, two adjustment springs are also provided at the second end of the telescopic rod, one end of the two adjustment springs is fixed on the telescopic rod, and the other end is fixed on the inner side of the supporting circular pad, and the two adjustment springs are distributed in a plane perpendicular to the hinge axis of the telescopic rod and the supporting circular pad.

[0016] As an option, the outer side surface of the supporting pad is an arc-shaped surface.

[0017] As an option, an elastic material layer is provided on the outer surface of the dome pad.

[0018] As an option, a sliding hole is opened on the support seat, the telescopic rod passes through the sliding hole, and the axis of the sliding hole intersects perpendicularly with the axis of the cylindrical surface of the slide column.

[0019] As an option, the bottom plate is in the shape of petals, each petal corresponds to a slideway, and the support seat is installed on the petals.

[0020] As an option, the plurality of slideways are evenly distributed on the cylindrical surface of the slideway column along the circumference of the cylindrical surface of the slideway column.

[0021] Compared with the prior art, the present invention solves the problem of rounding of thin-walled and easily deformable annular outer covers during laser engraving, improves the position accuracy of the pen during laser engraving, and meets the quality requirements of subsequent milling. The circumference of the rounding can be changed by adjusting the air pressure of the cylinder, and the spring angle on the rounding pad can be tilted, which is flexibly applicable to annular outer covers of various sizes and unequal radii, reducing the manufacturing cost of the laser engraving supporting fixture and improving the production and processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of a roundness correction fixture for a laser engraved outer cover in the present invention;

[0023] Figure 2A three-dimensional exploded view of a circular alignment fixture for a laser engraved outer cover in the present invention;

[0024] Figure 3 A cross-sectional view of a roundness calibration fixture for a laser engraved outer cover in the present invention;

[0025] Figure 4 A diagram showing the use of a circular alignment fixture for a laser engraved cover in the present invention (annular cover with equal circumference);

[0026] Figure 5 This is a diagram of the use state of a circular alignment fixture for a laser engraved outer cover in the present invention (annular outer cover with unequal circumference);

[0027] In the figure: 1-air pipe joint, 2-adjusting screw, 3-cylinder, 4-piston rod, 5-connecting assembly, 6-hanging ear, 7-slide column, 8-slide, 9-pin shaft, 10-double-head hinge, 11-support seat, 12-telescopic rod, 13-adjusting spring, 14-supporting round pad, 15-bottom plate, 16-bolt, 17-equal circumference annular outer cover, 18-unequal circumference annular outer cover. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with specific embodiments, but it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various modifications, substitutions and changes made according to common technical knowledge and customary means in the field are included in the scope of the present invention.

[0029] like Figure 1 to Figure 5 As shown in the figure, a circular calibration fixture for laser engraving cover designed by the present invention can realize circular calibration of the laser engraving of the annular cover within a certain radius length range, enhance the processing stability of the laser engraving process, ensure the accuracy of the cutting position, and guarantee the engraving quality. In addition, the universality and flexibility of the fixture are improved, which can meet Figure 4 The equal circumference annular outer cover 17 shown is a cylindrical outer cover, which can also meet the requirements of Figure 5 The unequal circumference annular outer cover 18 shown is a conical outer cover. When laser engraving annular outer covers of the same type but different specifications, there is no need to replace the fixture, thereby improving production efficiency.

[0030] like Figure 1 and Figure 2 As shown, the structure of the rounding fixture for the laser engraved outer cover is mainly composed of a cylinder 3, a connecting assembly 5, a slide column 7, a telescopic rod 12, a rounding pad 14, a base plate 15 and the like. The structure of the cylinder 3 is an existing technology, and the internal principle is not described in detail here.

[0031] The top of the cylinder 3 is provided with an air pipe joint 1 and an adjusting screw 2. The connecting assembly 5 is located inside the hollow slide column 7, connected to the cylinder 3 at the top, and the ear 6 on the outer wall is connected to the telescopic rod 12; the bottom of the slide column 7 is fixed above the bottom plate 15, and there are multiple straight slides 8 on the outer side of the wall of the slide column 7; one end of the telescopic rod 12 is connected to the ear 6 on the connecting assembly 5 through a double-headed hinge 10, and the other end is connected to the round pad 14, and the telescopic rod 12 passes through the support seat 11 with a round hole; the round pad 14 is in direct contact with the annular outer cover, and has a certain curvature on the contact surface, and the bottom plate 15 is flower-shaped to support the weight of the outer cover parts.

[0032] Driven by the pressure change of the cylinder 3, the connecting component 5 moves longitudinally in the slide column 7, driving the lugs 6 on the outer wall to slide longitudinally on the corresponding slide 8 on the slide column 7. The multiple lugs 6 on the outer wall of the connecting component 5 are connected to the telescopic rod 12 through a double-headed hinge 10, and the longitudinal movement is transmitted to the lateral movement, driving the multiple telescopic rods 12 to move along the radius of the circle. A circular hole is provided above the support seat 11 on the bottom plate 15, and the telescopic rod 12 passes through the circular hole to maintain the level of lateral movement. Inflate or exhaust the air pipe joint 1 above the cylinder 3, and the internal piston rod 4 moves longitudinally to a certain position. Maintaining the air pressure can lock the expansion radius of the telescopic rod 12 and fix the shape of the clamp. The connecting component 5 slides longitudinally, driving the lateral movement of the telescopic rod 12, and the radius of the clamp support circle can be adjusted to adapt to annular outer covers of different sizes. The end of each telescopic rod 12 is connected to the circular pad 14 through a pin 9. The outer side of the circular pad 14 directly contacts the annular outer cover, and the contact surface is a circular curved surface with the same radius. The contact material must have a certain elasticity to prevent the parts from being deformed due to uneven force during processing. An adjustment spring 13 is provided on each side of the circular pad 14, and the other end is connected to the telescopic rod 12. When the annular outer cover has different radii when processing, the circular pad 14 is tilted. Under the action of the adjustment spring 13, the circular pad 14 tilts to adapt to the shape of the part while maintaining good support stability. The slide column 7 is fixed to the bottom plate 15 of the fixture by multiple bolts 16. The bottom plate 15 is shaped like a petal according to the movement direction of the telescopic rod 12, and is lifted upward evenly by force.

[0033] In this embodiment, the cylinder 3 is arranged in a rectangular shape, and two air pipe joints 1 are arranged on the top of the cylinder 3, one of which is an air inlet and the other is an exhaust port. An adjusting screw 2 is installed at the bottom of the air pipe joint 1, and the air pipe joint 1 is connected to the air pipe and the external air source device.

[0034] The connecting assembly 5 is generally composed of two cylindrical bodies with different specifications. The connecting assembly 5 is installed in the slide column 7. The upper cylindrical body (i.e., sleeve) with a smaller radius is provided with a hollow groove, which can be inserted into the piston rod 4 of the cylinder 3 to achieve a longitudinal transmission effect; the lower part is a plurality of hanging ears 6 arranged on the outer wall of the cylindrical body, which can slide up and down within the range of the corresponding slide 8 on the slide column 7 to push the lower telescopic rod 12 to move.

[0035] The length of the slide 8 and the telescopic rod 12 is fixed, so the telescopic rod 12 can only move within a certain length range. The calibration radius of the clamp is controlled according to the pressurization and decompression of the air pressure. The specific calibration radius is not less than the length of the telescopic rod 12, not greater than the sum of the lengths of the telescopic rod 12 and the double-head hinge 10, and not greater than the radius length of the base plate 15.

[0036] Specifically, Figure 4 As shown, in this embodiment, after the cylinder 3 is inflated and pressurized, the piston rod 4 is pushed to move downward and inserted into the upper cylinder groove of the connecting component 5, thereby continuing to push the connecting component 5 to move downward, and slides down in the slideway 8 together with the hanging ear 6, the telescopic rod 12 is unfolded, and the calibration circle radius is expanded; when the calibration circle radius reaches the same as the inner radius of the annular outer cover, the clamping is relatively stable and fixed, then the cylinder 3 is stopped from being pressurized, and the adjusting screw 2 is tightened to fix the shape of the fixture and keep the shape unchanged during the laser engraving process.

[0037] Bolts 16 are installed on both sides of the bottom of the support seat 11 and fixed vertically on the bottom plate 15; the telescopic rod 12 is inserted into the circular hole above the support seat 11, and the horizontal movement of the telescopic rod 12 is maintained during the transmission process to ensure that the circle formed by the telescopic rod 12 is located in a uniform plane, while also increasing the stability of the clamping.

[0038] Specifically, in this embodiment, Figure 4 As shown, for the annular outer cover with the same circumference in the vertical direction, the circular support pad 14 is substantially perpendicular to the bottom plate 15, the adjustment springs 12 on both sides have the same deformation, the outer side is closely attached to the parts, and the contact surfaces of the eight circular support pads 14 are evenly stressed to maintain the standardization of the circular curvature and the accuracy of the calibration; Figure 5 As shown, for the annular outer cover with different radius circles in the vertical direction, the support circle pad 14 will show a certain degree of inclination, and the outer side will be closely attached to the parts to adapt to the shape of the inner wall of the annular outer cover, driving the pin shaft 9 at the bottom of the telescopic rod 12 to rotate, and the adjustment springs 13 at both ends of the support circle pad 14 have different deformation degrees. The two adjustment springs 13 are located in a plane perpendicular to the hinge axis of the telescopic rod 12 and the support circle pad 14. Here, the hinge axis refers to the pin shaft when the telescopic rod 12 and the support circle pad 14 are hinged, and two adjustment springs 13 are arranged in a plane perpendicular to the pin shaft.

[0039] The contact surface of the support pad 14 is not a plane, but a curved surface made of a certain elastic material to avoid damaging the flatness of the surface of the annular outer cover. The arc radius of all the support pads 14 contacting the curved surface is the same to maintain uniform force in all directions, thereby improving the accuracy of processing and rounding.

[0040] The above is a detailed introduction to a circular alignment fixture for a laser engraved outer cover provided by the present invention, and the structure and working principle of the present invention are described in a specific embodiment. The description of the above embodiment is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A rounding fixture for a laser engraved cover, characterized in that: include: Cylinder (3); A slide column (7), wherein the slide column (7) is a hollow cylindrical shell, a through hole is formed on the upper end surface of the slide column (7), a piston rod (4) of the cylinder (3) is inserted into the through hole, a plurality of straight slideways (8) are formed on the cylindrical surface of the slide column (7) and are connected to the hollow inner cavity of the slide column (7), and the slideways (8) are parallel to the cylindrical surface generatrix of the slide column (7); A connecting assembly (5), wherein the connecting assembly (5) is slidably connected in the hollow inner cavity of the slide column (7), the connecting assembly (5) is a cylindrical shell, and the piston rod (4) of the cylinder (3) passes through the through hole of the slide column (7) and is connected to the upper end of the connecting assembly (5); A telescopic rod (12), wherein a first end of the telescopic rod (12) is hinged on a cylindrical surface of a connecting assembly (5), and a second end of the telescopic rod (12) is hinged on an inner side surface of a rounding pad (14), and an outer side surface of the rounding pad (14) serves as a rounding surface for correcting the roundness of the outer cover; A bottom plate (15), the upper end of which is connected to the lower end of the slide column (7), a support seat (11) is also provided on the bottom plate (15), a plurality of support seats (11) are distributed on the outer side of the slide column (7), and a telescopic rod (12) is slidably connected in the support seat (11).

2. A roundness calibration fixture for a laser engraved cover according to claim 1, characterized in that: A hanging ear (6) is provided on the cylindrical surface of the connecting assembly (5), the hanging ear (6) protrudes outward along the radial direction of the cylindrical surface and extends into the slideway (8), and the first end of the telescopic rod (12) is hinged to the hanging ear (6).

3. A roundness calibration fixture for a laser engraved cover according to claim 1, characterized in that: The upper end surface of the connecting assembly (5) is provided with a sleeve, and the piston rod (4) of the cylinder (3) is inserted into the sleeve after passing through the through hole of the slide column (7).

4. A roundness calibration fixture for a laser engraved cover according to claim 2, characterized in that: The first end of the telescopic rod (12) is hinged to the hanging ear (6) via a double-head hinge (10).

5. The roundness calibration fixture for a laser engraved cover according to claim 1, characterized in that: The second end of the telescopic rod (12) is also provided with two adjustment springs (13), one end of the two adjustment springs (13) is fixed on the telescopic rod (12), and the other end is fixed on the inner side of the supporting circular pad (14), and the two adjustment springs (13) are distributed in a plane perpendicular to the hinge axis of the telescopic rod (12) and the supporting circular pad (14).

6. The roundness calibration fixture for a laser engraved cover according to claim 1, characterized in that: The outer surface of the supporting pad (14) is an arc-shaped surface.

7. A roundness calibration fixture for a laser engraved cover according to claim 6, characterized in that: An elastic material layer is arranged on the outer surface of the supporting pad (14).

8. The roundness calibration fixture for a laser engraved cover according to claim 1, characterized in that: The support seat (11) is provided with a sliding hole, the telescopic rod (12) passes through the sliding hole, and the axis of the sliding hole intersects perpendicularly with the axis of the cylindrical surface of the slideway column (7).

9. The roundness calibration fixture for a laser engraved cover according to claim 1, characterized in that: The bottom plate (15) is in the shape of petals, each petal corresponds to a slideway (8), and the support seat (11) is installed on the petals.

10. The roundness calibration fixture for a laser engraved cover according to claim 1, characterized in that: The plurality of slideways (8) are evenly distributed on the cylindrical surface of the slideway column (7) along the circumference of the cylindrical surface of the slideway column (7).

Images