Exhaust punch for square tube forming

Abstract

An exhaust punch for square tube forming comprises a punch body and an exhaust assembly arranged in the punch body. A containing cavity is formed in the front end of the punch body, and a transverse hole communicating with the containing cavity is formed in the side wall of the punch body. The exhaust assembly comprises a pressing head and a spring located at the bottom of the containing cavity, one end of the pressing head protrudes out of the front end of the punch body, and the other end of the pressing head stretches into the containing cavity to make contact with the spring. An anti-disengaging pin is arranged in the transverse hole and transversely penetrates through the pressing head, a gap exists between the outer wall of the anti-disengaging pin and the transverse hole, and an exhaust channel is formed among the transverse hole, the containing cavity and the pressing head. By arranging the exhaust assembly, after stamping is completed, under the action of elastic restoring force of the spring, the front end of the pressing head is separated from the front end of the punch body, the end of the exhaust channel is exposed out of the end face of the punch body and communicated with the outside, and therefore deformation caused by the vacuumizing phenomenon after forming is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of square tube forming processing, in particular to an exhaust punch for square tube forming. Background Art

[0002] Existing square tube forming processes generally use stamping. During the stamping process, when the punch returns after completing the stamping action, a vacuum phenomenon is generated between the punch and the inner wall of the formed square tube due to the punch's integral structure. This phenomenon causes the formed square tube to deform. Utility Model Content

[0003] Based on this, the purpose of the utility model is to provide a venting punch for square tube forming, so as to avoid deformation of the square tube due to vacuum after forming.

[0004] A venting punch for forming a square tube comprises a punch body and an venting assembly arranged in the punch body;

[0005] The front end of the punch body is provided with an accommodating cavity, and the side wall is provided with a transverse hole communicating with the accommodating cavity;

[0006] The exhaust assembly includes a pressure head and a spring, wherein the spring is located at the bottom of the accommodating cavity, one end of the pressure head protrudes from the front end of the punch body, and the other end extends into the accommodating cavity and contacts the spring;

[0007] An anti-dropout pin is provided in the transverse hole, and the anti-dropout pin passes through the pressure head transversely. There is a gap between the outer wall of the anti-dropout pin and the transverse hole, and an exhaust channel is formed between the transverse hole, the accommodating cavity and the pressure head;

[0008] After the stamping is completed, under the elastic restoring force of the spring, the front end of the pressing head is separated from the front end of the punch body, and the end of the exhaust channel is exposed from the end surface of the punch body and communicated with the outside.

[0009] Preferably, the pressure head comprises a head end, a middle end and an extension end connected in sequence;

[0010] A through hole is provided in the extending end, and the anti-drop pin is located in the through hole;

[0011] A communicating exhaust groove is provided on the side walls of the middle end and the extended end, one end of the exhaust groove is communicated with the transverse hole, and the other end extends to the connection between the head end and the middle end, and the exhaust groove, the accommodating cavity and the transverse hole form the exhaust channel;

[0012] During punching, the head end fits with the front end of the punch body.

[0013] Preferably, the accommodating cavity comprises a first cavity and a second cavity that are connected to each other, and the transverse hole is located on the side wall of the second cavity;

[0014] The middle end is located in the first cavity, and the extended end is located in the second cavity.

[0015] Preferably, a relief surface is provided on the side wall of the extending end, and a relief space is formed between the relief surface and the inner wall of the accommodating cavity;

[0016] A first groove body is provided in the middle end, and the first groove body and the avoidance space form the exhaust groove.

[0017] Preferably, the exhaust groove includes a first groove body located in the middle end, and a second groove body located in the extending end and connected to the first groove body.

[0018] Preferably, the anti-drop pin is an elastic cylindrical pin.

[0019] Compared with the prior art, the beneficial effect of the present invention is that: by setting an exhaust component, after the stamping is completed, the front end of the pressure head is separated from the front end of the punch body, and the end of the exhaust channel is exposed to the end face of the punch body and connected to the outside world, thereby avoiding deformation of the square tube due to vacuum after forming. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of the exhaust punch for forming a square tube in the utility model;

[0021] Figure 2 for Figure 1 Schematic diagram of the structure of the exhaust assembly;

[0022] Figure 3 for Figure 1 Cross-sectional view of the punch body.

[0023] Description of main component symbols:

[0024] 11-punch body; 111-accommodation cavity; 1111-first cavity; 1112-second cavity; 112-transverse hole;

[0025] 12-exhaust assembly; 121-pressure head; 1211-head end; 1212-middle end; 1213-extension end; 1214-avoidance surface; 1215-first slot; 122-spring;

[0026] 13-Prevent out-of-stock.

[0027] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0028] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are merely examples, and those skilled in the art may conceive of other obvious variations.

[0029] See also Figures 1 to 3 In one embodiment of the present invention, a square tube forming exhaust punch is provided, comprising a punch body 11 and an exhaust assembly 12 provided in the punch body 11;

[0030] The front end of the punch body 11 is provided with a receiving cavity 111, and the side wall is provided with a transverse hole 112 communicating with the receiving cavity 111;

[0031] The exhaust assembly 12 includes a pressing head 121 and a spring 122. The spring 122 is located at the bottom of the accommodating cavity 111. One end of the pressing head 121 protrudes from the front end of the punch body 11, and the other end extends into the accommodating cavity 111 and contacts the spring 122.

[0032] An anti-slip pin 13 is provided in the transverse hole 112 , and the anti-slip pin 13 passes through the pressure head 121 transversely. There is a gap between the outer wall of the anti-slip pin 13 and the transverse hole 112 , and an exhaust channel is formed between the transverse hole 112 , the accommodating cavity 111 and the pressure head 121 .

[0033] It should be noted that, in the present invention, since there is a gap between the outer wall of the anti-dropout pin 13 and the transverse hole 112, the pressure head 121 has a certain movable gap in the accommodating cavity 111. Specifically, during stamping, the end of the pressure head 121 fits with the front end of the punch body 11, thereby ensuring sufficient stamping force during stamping and avoiding affecting the stamping effect. At this time, the pressure head 121 retracts into the accommodating cavity 111, so that the spring 122 is in a compressed state; when the stamping is completed, under the action of the elastic restoring force of the spring 122, the front end of the pressure head 121 is separated from the front end of the punch body 11, and the end of the exhaust channel is exposed to the end face of the punch body 11 and communicates with the outside world.

[0034] See also Figure 2 and Figure 3 In a preferred embodiment of the present invention, the pressure head 121 includes a head end 1211, a middle end 1212 and an extension end 1213 connected in sequence;

[0035] A through hole is provided in the extension end 1213, and the anti-drop pin 13 is located in the through hole;

[0036] A communicating exhaust groove is provided on the sidewalls of the middle end 1212 and the extended end 1213. One end of the exhaust groove is communicated with the transverse hole 112, and the other end extends to the connection between the head end 1211 and the middle end 1212. The exhaust groove, the accommodating cavity 111, and the transverse hole 112 form the exhaust channel.

[0037] During punching, the head end 1211 fits with the front end of the punch body 11 .

[0038] Specifically, during installation, the spring 122 and the pressure head 121 are first installed into the accommodating cavity 111 in sequence, and then the anti-slip pin 13 is installed from the horizontal hole 112 on one side, passes through the through hole and enters the horizontal hole on the other side, thereby locking the pressure head 121 to prevent the pressure head 121 from detaching from the accommodating cavity 111.

[0039] See also Figure 2 and Figure 3 In a preferred embodiment of the present invention, the accommodating cavity 111 includes a first cavity 1111 and a second cavity 1112 that are connected to each other, and the transverse hole 112 is located on the side wall of the second cavity 1112;

[0040] The middle end 1212 is located in the first cavity 1111 , and the extended end 1213 is located in the second cavity 1112 .

[0041] Specifically, during stamping, the head end 1211 fits against the front end of the punch body 11 , and the middle end 1212 fits against the bottom of the first cavity 1111 , to prevent the pressure head 121 from over-compressing the spring 122 and causing the spring 122 to fail.

[0042] See also Figure 2 and Figure 3 In a preferred embodiment of the present invention, a sidewall of the extension end 1213 is provided with a relief surface 1214 , and a relief space is formed between the relief surface 1214 and the inner wall of the accommodating cavity 111 ;

[0043] A first groove body 1215 is provided in the middle end 1212 . The first groove body 1215 and the avoidance space form the exhaust groove. Such an arrangement can increase the exhaust space.

[0044] In a preferred embodiment of the present invention, the exhaust groove includes a first groove body located in the middle end 1212 and a second groove body located in the extending end 1213 and connected to the first groove body.

[0045] See also Figure 2In a preferred embodiment of the present invention, the anti-dropout pin 13 is an elastic cylindrical pin. Furthermore, an elastic force is provided to the exhaust assembly 12, so that after punching is completed, the anti-dropout pin 13 and the spring 122 generate a thrust on the pressing head 121, and the front end of the pressing head 121 is separated from the front end of the punch body 11.

[0046] To sum up, the present invention sets an exhaust component 12 so that after the stamping is completed, the front end of the pressure head 121 is separated from the front end of the punch body 11, and the end of the exhaust channel is exposed to the end face of the punch body 11 and connected to the outside world, thereby avoiding deformation of the square tube due to vacuum after forming.

[0047] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions merely illustrate the principles of the present invention. Various changes and improvements are possible without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed for the present invention is defined by the appended claims and their equivalents.

Claims

1. A square tube forming exhaust punch, characterized in that: It includes a punch body and an exhaust assembly provided in the punch body; The front end of the punch body is provided with an accommodating cavity, and the side wall is provided with a transverse hole communicating with the accommodating cavity; The exhaust assembly includes a pressure head and a spring, wherein the spring is located at the bottom of the accommodating cavity, one end of the pressure head protrudes from the front end of the punch body, and the other end extends into the accommodating cavity and contacts the spring; An anti-dropout pin is provided in the transverse hole, and the anti-dropout pin passes through the pressure head transversely. There is a gap between the outer wall of the anti-dropout pin and the transverse hole, and an exhaust channel is formed between the transverse hole, the accommodating cavity and the pressure head; After the stamping is completed, under the elastic restoring force of the spring, the front end of the pressing head is separated from the front end of the punch body, and the end of the exhaust channel is exposed from the end surface of the punch body and communicated with the outside.

2. The exhaust punch for forming a square tube according to claim 1, characterized in that: The pressure head includes a head end, a middle end and an extension end connected in sequence; A through hole is provided in the extending end, and the anti-drop pin is located in the through hole; A communicating exhaust groove is provided on the side walls of the middle end and the extended end, one end of the exhaust groove is communicated with the transverse hole, and the other end extends to the connection between the head end and the middle end, and the exhaust groove, the accommodating cavity and the transverse hole form the exhaust channel; During punching, the head end fits with the front end of the punch body.

3. The exhaust punch for forming a square tube according to claim 2, characterized in that: The accommodating cavity comprises a first cavity and a second cavity that are connected, and the transverse hole is located on the side wall of the second cavity; The middle end is located in the first cavity, and the extended end is located in the second cavity.

4. The exhaust punch for forming a square tube according to claim 2, characterized in that: A relief surface is provided on the side wall of the extension end, and a relief space is formed between the relief surface and the inner wall of the accommodating cavity; A first groove body is provided in the middle end, and the first groove body and the avoidance space form the exhaust groove.

5. The exhaust punch for forming a square tube according to claim 2, characterized in that: The exhaust slot includes a first slot body located in the middle end, and a second slot body located in the extending end and communicating with the first slot body.

6. The exhaust punch for forming a square tube according to any one of claims 1 to 5, characterized in that: The anti-drop pin is an elastic cylindrical pin.

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