Punching die and punching method

Abstract

The invention relates to a punching die and a punching method, and relates to the technical field of punching. According to the technical scheme, the punching die comprises a punching die body, a first punching part and a second punching part; the punching die body is used for positioning a part to be punched, and a flanging die cavity is formed in the punching die body; the first punching part isused for punching the part to be punched to enable a punch hole to be formed in the part to be punched, the punch hole is provided with a flange extending along the inner wall of the flanging die cavity, and the free end of the flange extends out of the flanging die cavity; and the second punching part is used for punching the free end of the flange to enable the free end of the flange to be bentoutside the punch hole. The punching die is mainly used for punching the punch hole with the flange on the part to be punched and bending the free end of the flange outwards so as to reduce burrs andzinc wires at the free end of the flange and enable the burrs and the zinc wires at the free end of the flange to be far away from a pipeline penetrating through the punch hole.

Description

technical field [0001] The invention relates to the technical field of punching, in particular to a punching die and a punching method. Background technique [0002] In the prior art, there is a flanging hole (that is, a punching hole) for the copper pipe to pass through on the side plate of the heat exchanger, and the flanging hole is stamped by a mold; specifically, as figure 1 As shown, the punch 11 punches the side plate 12 to form a flanging hole on the side plate 12. However, burrs and zinc wires will appear at the incision of the flanging 121. If the burrs and zinc wires on the flanging hole are not cleaned, it will cause the following technical problems: on the one hand, when the copper tube is threaded, the copper tube will be scratched, and then the expansion tube will break and the refrigerant will leak; on the other hand , the burr is squeezed between the copper tube and the side plate after the tube is expanded. Although the tube will not directly pierce the co...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, there is a flanging hole (that is, a punching hole) for the copper pipe to pass through on the side plate of the heat exchanger, and the flanging hole is stamped by a mold; specifically, as figure 1 As shown, the punch 11 punches the side plate 12 to form a flanging hole on the side plate 12. However, burrs and zinc wires will appear at the incision of the flanging 121.

If the burrs and zinc wires on the flanging hole are not cleaned, it will cause the following technical problems: on the one hand, when the copper tube is threaded, the copper tube will be scratched, and then the expanded tube will rupture and the refrigerant will leak; on the other hand , the burr is squeezed between the copper tube and the side plate after the tube is expanded. Although the tube will not directly pierce the copper tube when the tube is expanded, during the use of the air conditioner, due to the constant vibration of the heat exchanger, the burr The extrusion of the side plate will also slowly scratch the copper tube until the copper tube is pierced and the refrigerant leaks; on the other hand, the burrs will also fall into the copper tube, causing quality problems such as clogging the capillary

Therefore, in the prior art, it is necessary to manually remove burrs and zinc wires from each flanging hole on the heat exchanger by using a steel wire brush or a hair brush.

[0004] However, the above-mentioned method of manually removing burrs and zinc wires from the flanging holes by using wire brushes or hair brushes is not only inefficient and uncontrollable in quality, but also requires manual inspection of each flanging hole, thus investing a lot of manpower, material resources

Images