CN104400306B - A fixture for welding positioning of micro-diameter thin-walled tubes in heat exchangers - Google Patents

Abstract

For a fixture for heat exchanger micro-footpath thin-wall pipe welding location, it is made up of floating holder, dividing plate and stationary fixture three parts, and dividing plate inserts in floating holder transverse groove, and two ends semicircle orifice pairing coupling; Floating holder is arranged on stationary fixture section, is fixed by upper and lower screw.The present invention provides accurate location when erection welding for micro-footpath light-wall pipe.Which overcome the deficiency that conventional brace can not meet the accurate positioning requirements of micro-footpath light-wall pipe, ensure that the accurate location of micro-footpath light-wall pipe when erection welding, for the assembling of subsequent parts is laid a good foundation.

Description

A fixture for welding positioning of micro-diameter thin-walled tubes in heat exchangers

technical field

The invention relates to a fixture for welding and positioning micro-diameter thin-walled tubes of heat exchangers, which is suitable for precise positioning of dense micro-pipe fittings welding, provides a fixture for the positioning of spiral dense micro-pipe fittings, and belongs to the field of aerospace science and technology.

Background technique

The new heat exchanger has the characteristics of compact structure and high heat exchange efficiency. The forming of its parts and the assembly of the whole machine are the main difficulties in manufacturing the heat exchanger. The heat exchanger contains a large number of dense micro-diameter thin-walled tubes, which is its most critical component. When assembling and welding, the precise positioning of dense micro-diameter thin-walled tubes becomes a major difficulty in manufacturing heat exchangers, which directly affects the heat exchange efficiency of the heat exchanger and the quality of the whole machine.

The fixture is mainly composed of a positioning device, a clamping device, a clamp body, and other devices or components. The main function of the fixture is to keep the workpiece in the correct position in the fixture, and to ensure that the workpiece does not deviate from the correct position during processing. There are many types of traditional fixtures. According to the characteristics of use, it can be divided into universal fixtures, special fixtures, adjustable fixtures, and combined fixtures. Universal universal fixtures include vices, chucks, suction cups, etc., which have relatively large versatility. Specific and highly targeted, such as lathe fixtures, welding fixtures, milling machine fixtures, etc.; adjustable fixtures are used to replace or adjust special fixtures for components; combined fixtures are composed of fixtures of different shapes, specifications and uses, suitable for new Product trial production. Fixtures should have sufficient strength and rigidity, reliability of clamping, easy loading and unloading of parts and other basic requirements.

The heat exchanger contains a large number of densely arranged micro-diameter and thin-walled tubes. Because of its small and spiral structure, its precise positioning is very important during assembly and welding. Traditional universal fixtures are difficult to apply to the welding positioning of micro-diameter thin-walled pipes, and specific fixtures are generally redesigned for a certain product. Based on the difficulty of precise positioning during assembly and welding of micro-diameter thin-walled pipes, it is urgent to design a specific fixture. Aiming at the characteristics of densely arranged micro-diameter thin-walled tubes during assembly, the present invention proposes a fixture suitable for positioning micro-diameter thin-walled tubes during assembly and welding. The fixture can complete densely arranged micro-diameter thin-walled tubes Precise positioning during assembly welding.

Contents of the invention

(1. Purpose

The object of the present invention is to provide a fixture for welding positioning of micro-diameter thin-walled tubes of heat exchangers, which provides precise positioning for micro-diameter thin-walled tubes during assembly and welding. It overcomes the deficiency that the traditional fixture cannot meet the precise positioning requirements of the micro-diameter thin-walled tube, ensures the precise positioning of the micro-diameter thin-walled tube during assembly and welding, and lays the foundation for the assembly of subsequent components.

(2) Technical solution

The present invention is a fixture for welding and positioning micro-diameter thin-walled tubes of heat exchangers, as shown in FIG. 1 .

It consists of movable fixture 1, clapboard 2, fixed fixture 3, three parts. The positional relationship between them is: the partition is inserted into the square groove of the movable fixture, and the semicircular holes at both ends are paired and coupled; then the movable fixture is installed on the section of the fixed fixture and fixed by upper and lower screws.

The movable fixture 1 is made by processing a block blank. First process a square groove along the width direction, and then process a series of semicircular holes with equal diameter and equal spacing on the bottom surface of the groove. Finally, two round holes are processed at both ends of the movable fixture 1 for fixing with the fixed fixture.

The separator 2 is remanufactured by drilling and cutting a block blank. A series of round holes with equal diameter and equal spacing are processed in the middle of the block blank, and then a series of semicircular holes with equal diameter and equal spacing are processed on both sides. Two round holes are machined on the upper and lower sides of the partition, the purpose is to cooperate with the supporting connector when the whole machine is assembled. Finally, chamfer the bottom of the partition to prevent the innermost partition from interfering with the inner ring tube.

The fixing fixture 3 is processed and remanufactured from a round bar. First, a boss is partly cut on the round bar, a series of equal-diameter and equidistant semicircular holes are machined on the inner plane of the boss, and two round holes are machined perpendicular to the axis of the semicircular holes. A circular boss is first cut out at the bottom of the round bar, and then the planes on both sides are machined on the circular boss, which is symmetrical to the center of the boss. The purpose is to fit into a similarly shaped slot in the chassis.

When the fixture is working, the second row of micro-diameter thin-walled tubes is first passed through a series of circular holes in the middle of the partition, and then the first row of micro-diameter thin-walled tubes is placed in a series of semicircular holes in the fixing fixture, and then let The separator cooperates with the fixing fixture, so that a series of semicircular holes of the parts are coupled and paired with each other. A third row of micro-diameter thin-walled tubes is then placed in a series of semicircular holes in the outside of the partition (opposite the fixture). Finally, the movable fixture is placed on the fixed fixture, so that a series of semicircular holes between the movable fixture and the partition are coupled and paired with each other, and then screws are passed through the round holes in the fixed fixture and the movable fixture to fasten them.

Wherein, the movable fixture 1 has a length of 68 mm, a thickness of 4 mm, and a maximum width of 6.7 mm. The length of the square groove is 60mm. The width is 1.1mm and the depth is 2.7mm. The diameter of the semicircular hole is A total of 31 semicircular holes, the distance between each other is 1.8mm, and the diameter of the upper and lower ends of the holes is

Wherein, the outer dimension of the separator 2 is 60mm×2.7mm×2mm. The diameter of a plurality of equal-diameter circular holes and semicircular holes is There are 30 circular holes in total, and 31 semicircular holes on one side, with a distance of 1.8mm between them. The diameter of the upper and lower circular holes is The chamfer is 1mm×40°.

Wherein, the maximum diameter in the fixing fixture 3 is The length is 88mm. The height of the boss on the upper part is 68mm, and the thickness is 4mm. The diameter of the semicircular hole is A total of 31 semi-circular holes, the distance between each other is 1.8mm, and the diameter of the round holes is The distance between the axis of the semicircular hole and the vertical axis of the fixture 3 is 1.35 mm. The diameter of the lower boss is The thickness is 6mm.

(3) Advantages and efficacy

The present invention is based on the problem of difficult positioning of micro-diameter thin-walled tubes during assembly and welding of heat exchanger parts. It is the first to propose the fixture required for positioning during assembly and welding between micro-pipes. The advantages are mainly reflected in: the fixture is divided into three The composition, assembly and disassembly of the parts are relatively convenient; a series of grooves paired with each other in the fixture parts precisely locate the dense micro-diameter thin-walled tubes; Minor, not noticeable increase in mass for this prototype. After the partition is connected and fixed with the support, it can not only play the role of precise positioning during assembly and welding, but also prevent the disturbance of the micro-diameter thin-walled tube under actual working conditions.

Description of drawings

Figure 1 Schematic diagram of fixture assembly.

Figure 2 Schematic diagram of the movable fixture.

Figure 3 Schematic diagram of the separator.

Figure 4. Schematic diagram of the fixing fixture.

The serial numbers in the figure are explained as follows:

1. Movable fixture 2. Partition 3. Fixed fixture

detailed description

Referring to Fig. 1-Fig. 4, the present invention is a jig for welding and positioning micro-diameter thin-walled tubes of heat exchangers. It mainly includes movable fixture 1, partition plate 2, and fixed fixture 3 parts. The positional relationship between them is: the partition plate 2 is inserted into the transverse groove of the movable fixture 1, and the semicircular holes at both ends are paired and coupled; then the movable fixture 1 is installed on the section of the fixed fixture 3 and fixed by upper and lower screws.

When the fixture is working, firstly, the second row of micro-diameter thin-walled tubes are passed through a series of circular holes in the middle of the partition plate 2, and then the first row of micro-diameter thin-walled tubes are placed in a series of semicircular holes in the fixing fixture 3, Then let the partition plate 2 cooperate with the fixing fixture 3, so that a series of semicircular holes of the parts are coupled and paired with each other. A third row of microdiameter thin-walled tubes is then placed in a series of semicircular holes in the outside of the septum (relative to the fixture). Finally, place the movable fixture 1 on the fixed fixture 3, make a series of semicircular holes between the movable fixture 1 and the partition 2 couple with each other, and then use screws to pass through the round holes in the fixed fixture 3 and the movable fixture 1 to fasten them .

Wherein, the movable fixture 1 has a length of 68 mm, a thickness of 4 mm, and a maximum width of 6.7 mm. The length of the square groove is 60mm. The width is 1.1mm and the depth is 2.7mm. The diameter of the semicircular hole is A total of 31 semicircular holes, the distance between each other is 1.8mm. The diameter of the upper and lower circular holes is

Wherein, the outer dimension of the separator 2 is 60mm×2.7mm×2mm. The diameter of a plurality of equal-diameter circular holes and semicircular holes is There are 30 circular holes in total, and 31 semicircular holes on one side, with a distance of 1.8mm between them. The diameter of the upper and lower circular holes is The chamfer is 1mm×40°.

Wherein, the maximum diameter in the fixing fixture 3 is The length is 88mm. The height of the boss on the upper part is 68mm, and the thickness is 4mm. The diameter of the semicircular hole is A total of 31 semi-circular holes, the distance between each other is 1.8mm, and the diameter of the round holes is The distance between the axis of the semicircular hole and the vertical axis of the fixture 3 is 1.35mm. The diameter of the lower boss is The thickness is 6mm.

Claims (4)

1. A fixture for welding and positioning of micro-diameter thin-walled tubes in heat exchangers, characterized in that it consists of three parts: a movable fixture, a partition and a fixed fixture, the partition is inserted into the square groove of the movable fixture, and two The half-round holes at the ends are paired and coupled; the movable fixture is installed on the section of the fixed fixture and fixed by upper and lower screws; The movable fixture is made by processing a block blank; firstly, a square groove is processed along the width direction, then a series of semicircular holes of equal diameter and equal spacing are processed on the bottom surface of the groove, and finally two round holes are processed at both ends of the movable fixture for To be fixed with the fixture; The partition plate is made by drilling and cutting a block blank. A plurality of circular holes with equal diameter and equal spacing are processed in the middle of the block blank, and then a plurality of semicircles with equal diameter and equal spacing are processed on both sides. Holes; Two round holes are processed on the upper and lower sides of the partition, the purpose is to cooperate with the supporting connector when the whole machine is assembled, and finally chamfer the bottom of the partition, the purpose is to prevent the innermost partition from interfering with the inner ring tube; The fixing fixture is remanufactured from a round bar; first, a boss is partly cut out on the round bar, and a plurality of semicircular holes of equal diameter and equal spacing are machined on the inner plane of the boss, and are processed perpendicular to the axis of the semicircle hole. For the two round holes, a circular boss is first cut out at the bottom of the round bar, and then the planes on both sides are machined on the circular boss, which is symmetrical to the center of the boss, and the purpose is to match the groove with a similar shape on the chassis. 2. A fixture for welding and positioning micro-diameter thin-walled tubes of heat exchangers according to claim 1, characterized in that: the movable fixture has a length of 68mm, a thickness of 4mm, and a maximum width of 6.7mm; the length of the square groove The diameter of the semicircle hole is 60mm, the width is 1.1mm, and the depth is 2.7mm; the diameter of the semicircle hole of the movable fixture is Φ0.94mm, a total of 31 semicircular holes, the distance between each other is 1.8mm, and the diameter of the upper and lower ends of the movable fixture is Φ2mm . 3. A fixture for welding and positioning micro-diameter thin-walled tubes of heat exchangers according to claim 1, characterized in that: the outer dimensions of the partitions are 60mm×2.7mm×2mm; The diameter of the circular hole and the semicircular hole is Φ0.94mm, a total of 30 circular holes, 31 semicircular holes on one side, and the distance between each other is 1.8mm; the diameter of the upper and lower circular holes of the partition is Φ1mm, and the chamfer is 1mm ×40°. 4. A fixture for welding and positioning of micro-diameter thin-walled tubes in heat exchangers according to claim 1, characterized in that: the maximum diameter of the fixture is Φ10mm, the length is 88mm; the height of the upper part of the boss is 68mm, The thickness is 4mm; the diameter of the semicircle hole of the fixing fixture is Φ0.94mm, a total of 31 semicircle holes, the distance between each other is 1.8mm, the diameter of the hole of the fixing fixture is Φ2mm; the axis of the semicircle hole of the fixing fixture and the fixing fixture The vertical axis distance is 1.35mm, the diameter of the lower part of the boss is Φ8mm, and the thickness is 6mm.