Chip-free cutting knife tooling for aluminum flat pipe with large hole pitch

Abstract

Theinvention provides a chip-free cutting knife tooling for an aluminum flat pipe with large hole pitch. The chip-free cutting knife tooling comprises a knife rest, wherein one side of the lower end of the knife rest is provided with a press plate groove; a press plate is arranged in the press plate groove; press heads are arranged at the lower ends of the press plate and the knife rest; the middle part of the lower side of the press plate is provided with a cutting knife groove; the press plate at both sides of the cutting knife groove is provided with deburring knife grooves; a cutting knife is arranged in the cutting knife groove, and is arranged on the press plate through a cutting knife fixing bolt; a deburring knife is arranged in each deburring knife groove, and is arranged on the press plate through a deburring knife rest; the upper end of each deburring knife rest is connected with a deburring knife adjusting handle. The chip-free cutting knife tooling has the advantages that by arranging the deburring knives at both sides of a knife blade, after the pipe wall is cut by the cutting knife, the aluminum burrs, higher than the pipe wall, of the outwards folded aluminum chips are directly scraped by the following deburring knives in the working state; the action forces of the cutting knife and deburring knives on the surface of the pipe wall are parallel with the pipe wall, the collapsing of the pipe wall is avoided, and the hole height of the cut cross section is better than the two existing chip-free cutting types.

Description

technical field [0001] The invention relates to processing equipment for aluminum flat tubes of heat exchangers, in particular to tooling for chipless cutting of aluminum flat tubes with large hole spacing. Background technique [0002] At present, the existing aluminum flat tubes for heat exchangers used in automobiles and commercial air conditioners have a wall thickness of less than 0.4mm and a hole spacing of less than 1.5mm. In order to ensure production efficiency, the cutter cuts back and forth. When the hole spacing is greater than 1mm, the existing hob, because the blade rotates across the surface of the flat tube during cutting, so that when cutting, the surface of the flat tube of the cutter forms an inward pressure, and the blade penetrates into the aluminum extruded by the tube wall. The burrs will be pressed down into the tube together, so that after cutting, the cut hole will shrink, thereby reducing the flow cross-sectional area of ​​the heat exchange medium...

AI Technical Summary

Problems solved by technology

When the hole spacing is greater than 1mm, the existing hob, because the blade rotates across the surface of the flat tube during cutting, so that when cutting, the surface of the flat tube of the cutter forms an inward pressure, and the blade penetrates into the aluminum extruded by the tube wall. The burrs will be pressed down into the tube together, resulting in high shrinkage of the cut hole after cutting, thereby reducing the flow cross-sectional area of ​​the heat exchange medium originally designed

[0003] However, although the crescent-shaped knife does not rotate, when it cuts across the surface of the flat tube, the force formed by the cutter becomes parallel to the surface of the flat tube when cutting, and the height of the incision hole is also guaranteed to the maximum. With the change of the force, the aluminum burr extruded by the blade penetrates into the tube wall at the incision will turn out, and it will be higher on the tube wall, which will cause the thickness of the incision to become larger, and the collector cannot be inserted. This problem has not been solved. At present, balls or rollers are installed on both sides of the knife. After the cutter passes, the balls or rollers will crush the everted aluminum burrs. During the rolling process, the aluminum flat tube will also collapse inward to a certain extent, that is, the hole height will change. Small, but because the strength becomes smaller, the hole height of the incision is higher than the incision of the hob

[0004] For aluminum flat tubes with a hole spacing of 1 to 1.5mm, blade cutters are currently used in the industry. Due to the increase in span, the wall thickness is too thin and the bearing capacity is insufficient when subjected to the cutting force of the cutter or the deburring device. , resulting in serious incision collapse, the pipe wall is wavy at the incision, the one with rib support is high, and the one without it is low, but the front meets the requirements. When the hole spacing is greater than 1.5mm, the incision collapses seriously and cannot meet the technical requirements. At present, the industry can only use high-speed rotary saw blades to cut, which produces a large amount of aluminum chips, and also needs to remove the burrs of the incision. It is very difficult to remove the aluminum chips in the pipe, and it cannot be cleaned thoroughly. It will enter the heat exchange system of the whole machine, and the disadvantages are very obvious

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