CN113427145A - Clamping device and cutting method for laser cutting of half-edge pipe - Google Patents

Abstract

The invention provides a clamping device for laser cutting of a half-pipe, which comprises a fixed plate, a positioning plate, a stop block and a pressing and stopping mechanism, wherein the positioning plate, the stop block and the pressing and stopping mechanism are arranged on the fixed plate; the stop block is arranged at one end of the positioning plate and used for stopping the end wall of the rear half pipe after assembly; the pressing and blocking mechanism is arranged on the radial outer side of the positioning plate, a pressing block which can stretch out and draw back in the radial direction relative to the half pipe after assembly is arranged on the pressing and blocking mechanism, and the pressing block is used for pressing the flange edge on the radial outer side of the half pipe when extending out. The half pipe to be cut is internally supported by arranging the arc-shaped positioning plate, and the outside of the half pipe is compressed and limited by the pressing and blocking mechanism and the stop block. The device has the advantages of simple and reasonable structure, convenient assembly and disassembly, linear contact between the positioning plate and the half pipe to be cut, convenient slag blowing, cutting quality guarantee, firm positioning and strong universality.

Description

Clamping device and cutting method for laser cutting of half-edge pipe

Technical Field

The invention belongs to the technical field of positioning devices, and particularly relates to a clamping device and a cutting method for laser cutting of a half-edge tube.

Background

The laser cutting is a high-efficiency and flexible processing method for removing material allowance, and is widely used on aerospace sheet metal parts. Taking a stainless steel half-pipe as an example, the traditional processing adopts a linear cutting or manual shearing mode, the processing speed is low, the occupied resources are more, and the processing speed is high and the cost is saved by adopting laser cutting. During laser processing, the sheet metal part needs to be positioned so as to ensure the cutting precision. The positioning tool commonly used in positioning cannot meet the characteristics of small batch and multiple specifications of aerospace sheet metal parts. Taking a half-side pipe as an example, one production batch is only dozens of or hundreds of pieces, the cost of the whole tool is high, the manufacturing period is long, and the production requirements of quick and small batches cannot be met.

In order to save the manufacturing cost of the tool and reduce the production preparation time, a supporting framework is often used in the industry for supporting and positioning to finish the processing of single parts and small-batch parts. For example, the invention patent with publication number "CN 109759769B" entitled "laser cutting positioning tool" discloses a positioning device for processing a workpiece by using a laser beam, wherein a positioning component is arranged as a split type positioning unit, and the positioning unit with a profiling surface is combined to realize the support and positioning of the workpiece, so that the positioning tool is convenient to disassemble and assemble.

The pipe cutting is often with the help of chuck dress card, publication number is "CN 208680783U", utility model's utility model patent of "a nonrust steel pipe laser cutting device" has announced a nonrust steel pipe laser cutting device, press from both sides tight nonrust steel pipe and drive it around self axis rotation in order to reduce the area of becoming yellow of incision department through the clamping jaw to under the first fluid of nozzle injection and the second fluid combined action in the collecting tube, realize the quick discharge of fuse, but this method can only be used for processing the straight tube, can't be used for processing the return bend such as half limit pipe.

Disclosure of Invention

Based on the above problems, the present invention aims to provide a positioning device for laser cutting of a half pipe, so as to solve the problems of the prior art that the positioning device for the half pipe is complex, high in manufacturing cost, not firm in positioning, and poor in universality.

In order to achieve the above purpose, the invention adopts the technical scheme that: a clamping device for laser cutting of a flange at the edge of a half pipe comprises a fixed plate, a positioning plate, a stop block and a pressing and stopping mechanism, wherein the positioning plate, the stop block and the pressing and stopping mechanism are arranged on the fixed plate; the stop block is arranged at one end of the positioning plate and used for stopping the end wall of the rear half pipe after assembly; the pressing and blocking mechanism is arranged on the radial outer side of the positioning plate, a pressing block which can stretch out and draw back in the radial direction relative to the half pipe after assembly is arranged on the pressing and blocking mechanism, and the pressing block is used for pressing the flange edge on the radial outer side of the half pipe when extending out.

The invention also provides a method for cutting the half-edge pipe by using the device, which comprises the following steps:

step 1, placing a half-side pipe on a fixing plate, enabling the inner wall of the half-side pipe to abut against the circumferential edge of a positioning plate, enabling an edge flange to be cut on the half-side pipe to abut against the fixing plate outside the positioning plate, and enabling an end wall of an opening at one end of the half-side pipe to abut against a stop block; adjusting the pressing and blocking mechanism to enable the pressing block to extend out and tightly press the flange edge on the radial outer side of the half-side pipe, and completing assembly;

and 2, placing the assembled workpiece on a workbench of a laser cutting device, operating a laser cutting numerical control program, cutting off the edge flange on the half-side pipe along a cutting line by a laser head, and blowing off the melt at the cutting position in time by using coaxial high-pressure gas on the laser head.

Optimally, the circumferential edge of the positioning plate is in a sawtooth shape, the space left between adjacent teeth enables the linear contact density of the fixing plate and the inner wall of the half-side pipe not to be too large, and meanwhile, a larger space is reserved for blowing away slag.

Specifically, the pressing and blocking mechanism further comprises a cushion block and a limiting bolt, the cushion block is mounted on the fixing plate through a screw, an opening in the same extension direction as the pressing block is formed in the cushion block, and the pressing block is connected with the opening in a sliding mode; set up the bar hole on the briquetting, spacing bolt passes behind the bar hole with the fixed plate spiro union, the unscrewing bolt, the briquetting slides in order to be close to or keep away from the semi-pipe, screws the bolt in order to compress tightly the briquetting to the position that makes the briquetting is fixed and is being compressed tightly semi-pipe flange limit department, thereby convenient installation or take off the semi-pipe.

Specifically, a plurality of screw hole groups are arranged to the radial outside circumference of locating plate, and the screw in every screw hole group corresponds with screw, the bolt that is used for being connected to press and keeps off the mechanism, will press to keep off the mechanism and install on the screw hole group of adaptation according to waiting to cut half pipe tool body length and gyration angle to guarantee to press and keep off the mechanism and compress tightly the both ends of half pipe respectively with the dog, thereby realize that one set of frock can the multiple part of clamping.

Preferably, the positioning plate is connected with the fixing plate through a bolt. The bolt connection mode is convenient for workers to operate.

Preferably, the stopper and the fixing plate are welded by spot welding. The stop block plays a limiting role, the requirement on position precision is low, and the economy of spot welding is good.

The invention has the beneficial effects that:

according to the clamping device for laser cutting of the half-side pipe, the arc-shaped positioning plate is arranged to support the inside of the half-side pipe to be cut, and the pressing and limiting mechanism and the stop block are used for pressing and limiting the outside of the half-side pipe. The device has the advantages of simple and reasonable structure, convenient assembly and disassembly, linear contact between the positioning plate and the half pipe to be cut, convenient slag blowing, cutting quality guarantee, firm positioning and strong universality.

Drawings

FIG. 1 is a schematic view of a clamping device for laser cutting of a half-pipe provided by the present invention;

FIG. 2 is a schematic view of a hold-down mechanism;

FIG. 3 is a schematic view of an assembled half pipe in the embodiment;

FIG. 4 is a half-pipe schematic view;

wherein, 1 is the fixed plate, 2 is the locating plate, 3 is the dog, 4 is the briquetting, 5 is the cushion, 6 is the spacing bolt, 7 is the screw group, 8 is half limit pipe, 9 is the line of cut.

Detailed Description

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

As shown in fig. 1, the present embodiment provides a clamping device for laser cutting of a half-pipe, including a fixing plate 1, a positioning plate 2, a stop block 3 and a pressing stop mechanism, which are mounted on the fixing plate 1, where the positioning plate 2 is an arc plate adapted to the diameter of an inner hole of the half-pipe to be cut, the circumferential edge of the positioning plate 2 is in a zigzag shape, the half-pipe to be cut is covered outside the positioning plate 2 during assembly, and the positioning plate 2 is in line contact with the half-pipe to be cut; the stop block 3 is arranged at one end of the positioning plate 2 and used for stopping the end wall of the rear half pipe after assembly; the pressing and blocking mechanism is arranged on the radial outer side of the positioning plate 2, a pressing block 4 which can radially extend and retract relative to the assembled rear side pipe is arranged on the pressing and blocking mechanism, the pressing and blocking mechanism further comprises a cushion block 5 and a limiting bolt 6, the cushion block 5 is installed on the fixing plate 1 through a screw, an opening which is the same as the pressing block 4 in the extending and retracting direction is arranged on the cushion block 5, and as shown in fig. 2, the pressing block 4 is in sliding connection with the opening; a strip-shaped hole is formed in the pressing block 4, and the limiting bolt 6 penetrates through the strip-shaped hole and then is in threaded connection with the fixing plate 1; a plurality of screw hole groups 7 are circumferentially arranged on the radial outer side of the positioning plate 2, and screw holes in each screw hole group 7 correspond to screws and bolts used for being connected with the gear pressing mechanism.

The method for cutting the half-side pipe by using the device comprises the following steps:

step 1, as shown in fig. 3, placing a half-pipe 8 on a fixing plate 1, so that the inner wall of the half-pipe 8 abuts against the circumferential edge of a positioning plate 2, an edge flange to be cut on the half-pipe 8 abuts against the fixing plate 1 outside the positioning plate 2, and the end wall of an opening at one end of the half-pipe 8 abuts against a stop block 3; installing a pressing and blocking mechanism on the matched screw hole group 7 according to the specific length and the rotation angle of the half pipe 8 to be cut, loosening the bolt, sliding the pressing block 4 to be positioned above the flange edge on the radial outer side of the half pipe 8, screwing the bolt to tightly press the pressing block 4, so that the pressing block 4 tightly presses the flange edge to finish assembly;

and 2, placing the assembled workpiece on a workbench of a laser cutting device, operating a laser cutting numerical control program, cutting off an edge flange on a half-side pipe 8 by a laser head along a cutting line 9 shown in fig. 4, wherein the laser head is provided with coaxial high-pressure gas, blowing off the melt at the cutting position in time, and the high-power infrared laser and the high-pressure gas are emitted from the same nozzle and are in a coaxial relation, belonging to the existing device and not shown in the figure.

The above examples of the present invention are merely illustrative of the present invention and are not intended to limit the embodiments of the present invention. Variations and modifications in other variations will occur to those skilled in the art upon reading the foregoing description. Not all embodiments are exhaustive. All obvious changes and modifications of the present invention are within the scope of the present invention.

Claims (7)

1. The clamping device for laser cutting of the half-side pipe is characterized by comprising a fixed plate, a positioning plate, a stop block and a pressing and stopping mechanism, wherein the positioning plate, the stop block and the pressing and stopping mechanism are arranged on the fixed plate; the stop block is arranged at one end of the positioning plate and used for stopping the end wall of the rear half pipe after assembly; the pressing and blocking mechanism is arranged on the radial outer side of the positioning plate, a pressing block which can stretch out and draw back in the radial direction relative to the half pipe after assembly is arranged on the pressing and blocking mechanism, and the pressing block is used for pressing the flange edge on the radial outer side of the half pipe when extending out.

2. The clamping device for laser cutting of half-pipes as claimed in claim 1, wherein the positioning plate is serrated at its circumferential edge.

3. The clamping device for laser cutting of the half-edge pipe as claimed in claim 1, wherein the pressing and blocking mechanism further comprises a cushion block and a limiting bolt, the cushion block is mounted on the fixing plate through a screw, an opening in the same extension direction as the pressing block is formed in the cushion block, and the pressing block is connected with the opening in a sliding mode; the briquetting is last to set up the bar hole, spacing bolt passes behind the bar hole and the fixed plate spiro union.

4. The clamping device for laser cutting of the half-pipe as claimed in claim 3, wherein a plurality of screw hole groups are circumferentially arranged on the radial outer side of the positioning plate, and a screw hole in each screw hole group corresponds to a screw and a bolt used for connecting the pressing and blocking mechanism.

5. The clamping device for laser cutting of the half-pipe as claimed in claim 1, wherein the positioning plate is connected with the fixing plate through a bolt.

6. The clamping device for laser cutting of half-pipes as claimed in claim 1, wherein the stop block is welded to the fixing plate by spot welding.

7. Method for laser cutting of half-pipes using a device according to any of claims 1 to 6, characterized in that it comprises the following steps:

step 1, placing a half-side pipe on a fixing plate, enabling the inner wall of the half-side pipe to abut against the circumferential edge of a positioning plate, enabling an edge flange to be cut on the half-side pipe to abut against the fixing plate outside the positioning plate, and enabling an end wall of an opening at one end of the half-side pipe to abut against a stop block; adjusting the pressing and blocking mechanism to enable the pressing block to extend out and tightly press the flange edge on the radial outer side of the half-side pipe, and completing assembly;

and 2, placing the assembled workpiece on a workbench of a laser cutting device, operating a laser cutting numerical control program, cutting off the edge flange on the half-side pipe along a cutting line by a laser head, and blowing off the melt at the cutting position in time by using coaxial high-pressure gas on the laser head.

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