CN109129583B - Cutting tool and cutting method for PMI foam on curved surface of radome - Google Patents

Abstract

A cutting tool and a cutting method for PMI foam on a curved surface of a radome are disclosed. The cutting tool comprises a cutting clamp and a cutting tool. The cutting fixture comprises a cutting reference steel plate, a plate frame and a positioning seat. The cutting tool comprises a blade and a magnet seat. The cutting fixture is used for accurately positioning the curved surface PMI foam, and the cutting tool is used for accurately cutting. The magnet seat can be adsorbed on the cutting reference steel plate, the assembly structure of the magnet seat and the blade can enable the blade edge to be accurately located at the cutting position of the PMI foam, and an operator can hold the magnet seat to slide and cut on the cutting reference steel plate along the cutting direction. The invention has the advantages that: 1. the cutting edge line shape is smooth and standard, the cutting quality is good, and the PMI foam can realize accurate alignment splicing; 2. the operation force application is smooth, the operation is convenient and quick, and the problem that the knife edge is easy to shift left and right is avoided; 3. the processing cost is greatly reduced, and the problem that the material is scrapped due to poor cutting quality in the traditional method is solved due to good cutting quality.

Description

Cutting tool and cutting method for PMI foam on curved surface of radome

Technical Field

The invention relates to a cutting clamp, a cutting tool and a cutting method for curved surface PMI foam.

Background

The radome is usually in a half-wave wall structure, a single-layer thin-wall structure or a sandwich structure. Sandwich materials of sandwich construction are usually used with an aramid paper honeycomb core and a PMI foam core. PMI foam usually needs to be processed, cut and spliced during the use process due to the limitation of material size and the appearance of the product.

Chinese patent 106739043A discloses a PMI foam sandwich aircraft radome and a manufacturing method thereof, wherein the method adopts a blocking molding method to manufacture a plurality of curved PMI foam blanks, and then the radome with an integral sandwich structure is completed by splicing. After the curved surface PMI foam blank is finished, accurate cutting and splicing are needed. In the manual cutting process, a common art designing cutter is often used for cutting, the art designing cutter is manually controlled, the cutter edge is easy to shift left and right, the cutting edge of PMI foam is not standard, and the joint gap is too large to cause scrapping during later splicing. A simple and practical technical scheme is needed in production to solve the cutting problem of the curved surface PMI foam.

Disclosure of Invention

The invention aims to provide a cutting clamp for curved PMI foam.

The utility model provides a curved surface PMI foam cut jig, includes cuts benchmark steel sheet, grillage and positioning seat, it is equipped with the arc limit mouth to cut the benchmark steel sheet board, the shape of arc limit mouth and the piecemeal shaping boundary phase-match of cover body curved surface, the positioning seat is fixed in the tip of cutting the benchmark steel sheet, positioning seat accessible bolt will cut the benchmark steel sheet and be positioned on the forming die who corresponds the position.

And (3) cutting a reference steel plate, namely processing an arc-shaped edge opening by adopting a steel plate according to the curved surface PMI foam block forming boundary as a reference, wherein the arc-shaped edge opening is matched with the block forming boundary of the curved surface of the cover body. Because the cutting reference steel plate is a long piece, the steel plate is easy to bend and deform in the thickness direction, and the plate frame can play a role in fixing and shaping the cutting reference steel plate in the thickness direction, so that the cutting reference steel plate is ensured not to bend and deform in the thickness direction.

Another problem to be solved by the present invention is to provide a cutting tool for curved PMI foams.

The utility model provides a cutting tool of curved surface PMI foam, includes blade and magnet seat, the bottom of magnet seat is equipped with the notch of assembly blade, shape, the size of notch and the shape, the size phase-match of blade, blade bonding are fixed in notch department.

The cutting tool for the curved surface PMI foam is a special tool matched with the cutting clamp for the curved surface PMI foam. The cutting fixture is used for cutting the reference steel plate and the accurate positioning of the curved surface PMI foam, and the cutting tool is used for accurate cutting. The magnet seat can be adsorbed on the cutting reference steel plate, the assembly structure of the magnet seat and the blade can accurately position the blade edge at the cutting position of the PMI foam, an operator holds the magnet seat to slide and cut along the cutting direction on the cutting reference steel plate, and the problem that the blade edge is easy to shift left and right is avoided.

A third problem to be solved by the present invention is to provide a cutting method of curved PMI foam.

A cutting method of curved PMI foam comprises the following steps:

a. determining a cutting line of the PMI foam on a forming die according to the designed block forming boundary;

b. accurately aligning and fixing the curved PMI foam which is reserved with the cutting allowance and is formed by blocks in a corresponding area of a forming die by using an adhesive tape and a double-sided adhesive tape;

c. installing and positioning the curved surface PMI foam cutting clamp on a forming die at a corresponding position, wherein the arc-shaped edge of the cutting reference steel plate is flush with the cutting line;

d. the bottom of the magnet seat of the curved PMI foam cutting tool is attached to a cutting reference steel plate, the blade edge of the blade is aligned to the cutting position of the curved PMI foam, and an operator holds the magnet seat to slide and cut along the cutting line direction on the cutting reference steel plate, so that cutting can be accurately finished.

The cutting fixture is used for accurately positioning the curved surface PMI foam, and the cutting tool is used for accurately cutting. The magnet seat of the cutting tool can accurately position the blade edge at the cutting position of the PMI foam, an operator holds the magnet seat to slide and cut on the cutting reference steel plate along the cutting direction, and the problem that the blade edge is easy to shift left and right is avoided.

The invention has the following advantages:

1. the cutting edge is smooth and standard in line shape and good in cutting quality. According to the invention, a mode of combining a special cutting clamp and a special cutting tool is adopted, the accurate cutting requirement of PMI foam cutting is met to the maximum extent, and the adjacent PMI foam pieces can realize accurate contraposition splicing.

2. The operation and force application are smooth, convenient and fast. The operator holds the magnet seat to slide and cut on the cutting reference steel plate along the cutting direction, so that the problem that the cutter edge of the manual control art knife is easy to shift left and right is solved.

3. Greatly reducing the processing cost. Due to the good cutting quality, the problem that the material is scrapped due to the poor cutting quality of the traditional method is solved. Accurate cutting guarantees accurate butt joint of butt joint side openings, seam goodness of fit is good, follow-up splicing is simple and convenient, and cutting splicing requirements of PMI foam pieces with large sizes and different thicknesses can be completely met.

Drawings

FIG. 1 is a schematic PMI foam cutout section.

Fig. 2 is a side view schematic of fig. 1.

FIG. 3 is a schematic view of an assembly structure of an embodiment of a PMI foam cutting jig.

Fig. 4 is a schematic sectional structure view of a-a of fig. 3.

FIG. 5 is a schematic diagram of a magnet holder of an embodiment of a cutting tool.

FIG. 6 is a schematic view of an assembly structure of an embodiment of a cutting tool.

Fig. 7 is a schematic diagram of the cutting principle of the present invention.

In the figure: cutting a reference steel plate 1, a plate frame 2, a positioning seat 3, an arc-shaped side opening 4, a blocking forming dividing line 5, a forming die 6, a blade 7, a magnet seat 8, a notch 9 and curved surface PMI foam 11.

Detailed Description

As shown in fig. 1 to 7, an embodiment of a cutting jig for curved PMI foam includes a cutting reference steel plate 1, a plate frame 2 and a positioning seat 3, wherein the cutting reference steel plate 1 is provided with an arc-shaped rim 4, the shape of the arc-shaped rim 4 matches with a blocking forming boundary 5 of a curved surface of a cover body, the positioning seat 3 is fixed at an end portion of the cutting reference steel plate 1, and the cutting reference steel plate 1 can be positioned on a forming mold 6 of a corresponding position by the positioning seat 3 through bolts.

And (3) cutting the reference steel plate 1, processing an arc-shaped edge opening 4 by using a steel plate with the thickness of 2 mm through a punch or water cutting by taking the curved surface PMI foam block forming boundary 5 as a reference, wherein the arc-shaped edge opening 4 is matched with the block forming boundary 5 of the curved surface of the cover body (when the assembly is in place, the distance between the curved surface PMI foam 11 and the arc-shaped edge opening 4 is not more than 5 mm). Because the cutting reference steel plate 1 is a long piece, the steel plate is easy to bend and deform in the thickness direction, and the plate frame 2 can play a role in fixing and shaping the cutting reference steel plate 1 in the thickness direction, so that the cutting reference steel plate 1 is ensured not to bend and deform in the thickness direction.

An embodiment of a cutting tool for curved PMI foam comprises a blade 7 and a magnet seat 8, wherein a notch 9 for assembling the blade 7 is formed in the bottom end of the magnet seat 8, the shape and the size of the notch 9 are matched with those of the blade, and the blade 7 is fixedly bonded to the notch 9. As shown in fig. 5 and 6, in the manufacturing of the cutting tool, the magnet base 8 is processed by strong magnets (made of neodymium iron boron), the blade 7 is a common art knife, and the magnet base 8 and the blade 7 are bonded together by 502 glue.

The cutting tool for the curved surface PMI foam is a special tool matched with the cutting clamp for the curved surface PMI foam. The cutting fixture is used for cutting the reference steel plate 1 and the curved surface PMI foam 11 at accurate positioning, and the cutting tool is used for accurate cutting. The magnet seat 8 can be attached to the cutting reference steel plate 1, the assembly structure of the magnet seat 8 and the blade 7 can enable the edge of the blade 7 to be accurately located at the cutting position of the PMI foam 11, an operator can hold the magnet seat 8 to slide and cut along the cutting direction on the cutting reference steel plate 1, and the problem that the edge of the blade is prone to left and right deviation is avoided.

As shown in fig. 4 and 7, a method for cutting a curved PMI foam includes the following steps:

a. determining a cutting line of the PMI foam 11 on the forming die 6 according to the designed dividing line 5 for the block forming;

b. precisely aligning and fixing the curved PMI foam 11 which is reserved with cutting allowance and is formed by blocks in a corresponding area of the forming die 6 by using an adhesive tape and a double-sided adhesive tape;

c. installing and positioning the curved surface PMI foam cutting clamp on a forming die 6 at a corresponding position, wherein the arc-shaped edge opening 4 of the cutting reference steel plate 1 is flush with the cutting line;

d. the bottom of a magnet seat 8 of the curved PMI foam cutting tool is attached to a cutting reference steel plate 1, the edge of a blade 7 is aligned with the cutting part of the curved PMI foam 11, and an operator holds the magnet seat 8 to slide and cut along the cutting line direction on the cutting reference steel plate 1, so that cutting can be accurately finished.

The cutting fixture is used for accurately positioning the curved surface PMI foam 11, and the cutting tool is used for accurately cutting. The magnet seat 8 of the cutting tool can accurately position the knife edge of the blade 7 at the cutting position of the PMI foam 11, and an operator holds the magnet seat 8 to slide and cut on the cutting reference steel plate 1 along the cutting direction, so that the problem that the knife edge is easy to shift left and right is avoided.

In the cutting step b, except for the alignment and fixation of the pressure sensitive adhesive tape and the double-sided adhesive tape, a perforated isolation film and a vacuum bag film can be laid after the alignment, and a vacuumizing method is adopted to completely attach the PMI foam 11 to the mold, remove the vacuum bag, and precisely align and fix the PMI foam 11 on the forming mold 6 (as shown in FIG. 4). And after the cutting clamp is fixedly installed by bolts, the cutting tool slides along the arc-shaped edge opening 4 of the cutting reference steel plate 1 for cutting. By repeating the steps, the cutting of a plurality of pieces of PMI foam 11 corresponding to different areas can be completed.

The present invention is not limited to the specific structure of the above embodiments, and the processing method is not limited to the specific steps, and other similar structures and equivalent changes of the similar methods are within the protection scope of the present invention.

Claims (2)

1. The utility model provides a cutting means of radome curved surface PMI foam which characterized in that: comprises a cutting clamp and a cutting tool; the cutting fixture comprises a cutting reference steel plate, a plate frame and a positioning seat, wherein the cutting reference steel plate is provided with an arc-shaped edge opening, the shape of the arc-shaped edge opening is matched with a blocking forming boundary line of the curved surface of the cover body, the positioning seat is fixed at the end part of the cutting reference steel plate, and the cutting reference steel plate can be positioned on a forming die at a corresponding position through a bolt by the positioning seat; the cutting tool comprises a blade and a magnet seat, a notch for assembling the blade is formed in the bottom end of the magnet seat, the shape and the size of the notch are matched with those of the blade, and the blade is fixedly bonded at the notch; the cutting tool is adsorbed on a cutting reference steel plate of the cutting clamp through the magnet seat.

2. A cutting method using the cutting tool of the radome PMI foam of claim 1, comprising the steps of:

a. determining a cutting line of the PMI foam on a forming die according to the designed block forming boundary;

b. accurately aligning and fixing the curved PMI foam which is reserved with the cutting allowance and is formed by blocks in a corresponding area of a forming die by using an adhesive tape and a double-sided adhesive tape;

c. installing and positioning the curved surface PMI foam cutting clamp on a forming die at a corresponding position, wherein the arc-shaped edge of the cutting reference steel plate is flush with the cutting line;

d. the bottom of the magnet seat of the curved PMI foam cutting tool is attached to a cutting reference steel plate, the blade edge of the blade is aligned to the cutting position of the curved PMI foam, and an operator holds the magnet seat to slide and cut along the cutting line direction on the cutting reference steel plate, so that cutting can be accurately finished.

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