阅读说明：本技术 一种用于钎焊箔抗下垂值测量的检测方法及测量装置 (Detection method and measurement device for measuring anti-sagging value of brazing foil ) 是由 刘前换 田国建 史明飞 吴保剑 于 2020-05-12 设计创作，主要内容包括：本发明公开了一种用于钎焊箔抗下垂值测量的检测方法及测量装置,包括以下步骤：①、将需检测的材料制成待测试箔片；②、将待测试箔片夹持在测量装置中；③、将夹持有待测试箔片的测量装置放置于马弗炉中；④、对待测试箔片依次进行快速加热、持续保温和冷却处理；⑤、将待测试箔片连通测量装置一同取出,测量并计算下垂值。本发明通过专用的测量装置,并通过直接加热检测的方式来直接测量钎焊箔的抗下垂能力,测量结果准确,测量速度快。(The invention discloses a detection method and a measurement device for measuring a sagging resistance value of a brazing foil, which comprises the following steps of ①, preparing a material to be detected into a foil to be tested, ②, clamping the foil to be tested in the measurement device, ③, placing the measurement device clamping the foil to be tested in a muffle furnace, ④, sequentially and rapidly heating, continuously preserving heat and cooling the foil to be tested, ⑤, taking the foil to be tested out together with the measurement device, measuring and calculating the sagging resistance value.)

1. A detection method for measuring the sag resistance value of a brazing foil is characterized by comprising the following steps:

①, taking the length of the material to be detected to be 80-120mm along the rolling direction, and taking the length to be 20-25mm along the transverse direction, and preparing the foil to be tested;

②, clamping the foil to be tested in the measuring device, wherein after clamping, the length of the front end of the foil to be tested exposed outwards is about 50 mm;

③, placing the measuring device clamped with the foil to be tested in a muffle furnace with nitrogen protection, closing the furnace door, introducing nitrogen for purging, and ensuring that the internal oxygen content is lower than 150 PPM;

④, sequentially carrying out rapid heating, continuous heat preservation and cooling treatment on the foil to be tested;

⑤, the foil to be tested is taken out together with the measuring device, and the end high end of the protruding part of the tested foil is measured, so as to calculate the droop value.

2. The method as claimed in claim 1, wherein the rapid heating stage in step ④ is performed at a heating rate of 30K/min and a heating time of 19min or so from room temperature of 20 ℃ to 600 ℃.

3. The method as claimed in claim 1, wherein the specific parameters of the continuous maintaining period in step ④ are that the temperature is kept constant at 600 degrees centigrade for about 10 min.

4. The method as claimed in claim 1, wherein in step ④, the specific parameters of the cooling process are that the temperature is decreased from 600 ℃ to 200 ℃, the cooling rate is 8K/min, and the time is about 50 min.

5. A measuring device for measuring the sagging resistance value of a brazing foil as used in any one of claims 1 to 4, comprising a main frame, wherein the side wall of the main frame is connected with a front frame and a rear frame, the front frame and the rear frame have the same height, a pressure plate is arranged above the front frame and the rear frame, the pressure plate comprises a front pressure plate and a rear pressure plate, the front pressure plate is matched with the front frame, the rear pressure plate is matched with the rear frame, the front pressure plate and the rear pressure plate are connected through a plurality of connecting plates, the upper surface of the front frame is connected with an upper plate through a sliding rod, the front pressure plate is provided with a sliding hole matched with the sliding rod, the rear pressure plate is provided with a bolt through hole, the upper plate is connected with a pressing mechanism, the pressing mechanism comprises a plurality of pressing heads, the bottoms of the pressing heads are abutted against the upper surface of the front pressure plate, the middle parts of the pressing heads pass through the upper plate and are connected with the connecting, the upper surface of connecting plate is equipped with the handle, and the head of pressure head passes through the spring and links to each other with the lower surface of upper plate.

6. The measuring device for the sag resistance value measurement of the brazing foil as recited in claim 5, wherein the main frame has a height of 100-120 mm.

7. The measuring device for measuring the sagging resistance value of the brazing foil according to claim 5, wherein the lower surface of the header plate is higher than the lower surfaces of the front and rear pressing plates.

Technical Field

The invention relates to a detection method and a measurement device for measuring a sagging resistance value of a brazing foil.

Background

The brazing aluminum foil is one of key materials for manufacturing heat exchangers in the fields of automobiles, engineering machinery, air cooling of power stations, micro-channels, PTC, air separation and the like, and is formed by rolling and compounding a coating layer alloy single-side or double-side coating matrix alloy or rolling a direct single-layer organism alloy. In the heat exchanger production industry in the fields of automobiles and the like, brazing is widely used as a method for reliably connecting aluminum and aluminum alloy.

The sag resistance of the brazing aluminum foil is the most critical quality index, and no test method for evaluating the sag resistance of the brazing aluminum foil exists at present. The sag resistance of brazed aluminum foils has also only been indirectly characterized in the heat exchanger manufacturing industry by other means, such as: the defect of 'shrinkage after welding of a heat exchanger' is traced to 'poor sag resistance of the brazing aluminum foil', but the method has large investment and large loss, and the sag resistance of the brazing aluminum foil cannot be judged in advance.

Disclosure of Invention

The invention aims to solve the defects of the prior art and provides a detection method and a measurement device for measuring the sagging resistance value of a brazing foil.

A test method for measuring the sag resistance of a brazing foil, comprising the steps of:

①, taking the length of the material to be detected to be 80-120mm along the rolling direction, and taking the length to be 20-25mm along the transverse direction, and preparing the foil to be tested;

②, clamping the foil to be tested in the measuring device, wherein after clamping, the length of the front end of the foil to be tested exposed outwards is about 50 mm;

③, placing the measuring device clamped with the foil to be tested in a muffle furnace with nitrogen protection, closing the furnace door, introducing nitrogen for purging, and ensuring that the internal oxygen content is lower than 150 PPM;

④, sequentially carrying out rapid heating, continuous heat preservation and cooling treatment on the foil to be tested;

⑤, the foil to be tested is taken out together with the measuring device, and the end high end of the protruding part of the tested foil is measured, so as to calculate the droop value.

Preferably, in step ④, the specific parameters of the rapid heating stage are that the temperature is increased from room temperature 20 ℃ to 600 ℃, the heating rate is 30K/min, and the duration is about 19 min.

Preferably, in step ④, the specific parameter of the continuous heat-preserving stage is that the temperature is kept constant at 600 ℃ for about 10 min.

Preferably, in step ④, the specific parameters of the cooling stage are that the temperature is reduced from 600 ℃ to 200 ℃, the cooling rate is 8K/min, and the duration is about 50 min.

A measuring device for measuring the sag resistance value of the brazing foil used in the detection method comprises a main frame, the side wall of the main frame is connected with a front frame and a rear frame, the upper surfaces of the front frame and the rear frame are equal in height, a pressure plate is arranged above the front frame and the rear frame, the pressing plate comprises a front pressing plate and a rear pressing plate, the front pressing plate is matched with the front frame, the rear pressing plate is matched with the rear frame, the front pressing plate and the rear pressing plate are connected through a plurality of connecting plates, the upper surface of the front frame is connected with an upper plate through a sliding rod, the front pressing plate is provided with a sliding hole matched with the sliding rod, the rear pressing plate is provided with a bolt through hole, the upper plate is connected with a pressing mechanism, the pressing mechanism comprises a plurality of pressing heads, the bottoms of the pressing heads are abutted against the upper surface of the front pressing plate, the middle parts of the pressing heads penetrate through the upper plate and are connected with the connecting plate, the upper surface of connecting plate is equipped with the handle, and the head of pressure head passes through the spring and links to each other with the lower surface of upper plate.

Preferably, the height of the main frame is 100-120 mm.

Preferably, the lower surfaces of the headers are higher than the lower surfaces of the front and rear press plates.

Has the advantages that:

the invention directly measures the anti-sagging capability of the brazing foil by a special measuring device and a direct heating detection mode, and has accurate measuring result and high measuring speed.

Drawings

FIG. 1 is a schematic view of the general structure of a measuring device for measuring the sagging resistance of a brazing foil;

FIG. 2 is a front view of a measuring device for measuring the sag resistance of a brazing foil;

FIG. 3 is an exploded view of a measuring device for measuring the sag resistance of a brazing foil;

FIG. 4 is a table of temperature control parameters at the time of detection;

FIG. 5 is a table of the test results in the first embodiment;

FIG. 6 is a table showing the results of the detection in the second embodiment;

FIG. 7 is a table showing the results of the detection in the third embodiment;

1. the main frame 2, the foil to be tested 3, the front frame 4, the pressure plate 5, the upper plate 6, the spring 7, the connecting plate 8, the handle 9, the sliding rod 10, the fixing bolt 11 and the rear frame.

Detailed Description

For the purpose of enhancing the understanding of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.