Sheet piece punching device

Abstract

The utility model relates to a sheet punching device, which comprises a punching needle fixing seat (6), a base (9), a guide sleeve fixing seat (7), a punching needle guide sleeve (2) and a punching seat ejector pin guide sleeve (5), wherein the punching needle fixing seat (6) is provided with a punching needle (3); the guide sleeve fixing seat (7) is fixedly arranged on the base (9) and is of a C-shaped structure; the punching needle guide sleeve (2) and the punching seat ejector pin guide sleeve (5) are respectively and fixedly arranged on an upper C-shaped support arm and a lower C-shaped support arm of the guide sleeve fixing seat (7); the central axis of the punching needle guide sleeve (2) and the central axis of the punching seat ejector pin guide sleeve (5) are coaxially arranged; the punching needle (3) is embedded in the punching needle guide sleeve (2) in a sliding mode, and the end face of a punching head of the punching needle (3) is arranged in a concave mode. The sheet punching device is simple in structure, stable in punching structure and high in precision, and the quality of the edge of a sheet sample is high.

Description

Technical Field

[0001] The utility model relates to a thin sheet punching device, belonging to the technical field of experimental instruments. Background Art

[0002] In some scientific research experiments, material testing and other applications, it is generally necessary to prepare primary samples in advance. For example, in transmission electron microscopy (TEM) experiments to observe the microstructure of metal materials, the metal material to be tested needs to be thinned and then punched out with a punching machine to produce a metal sheet sample, such as a thin disc with a diameter of 3mm and a thickness of less than 0.1mm. The primary sample is then further processed to meet the testing requirements. Due to manufacturing and assembly deviations in the concentricity of the punch needle and die of traditional punching devices, as well as uneven deformation of the stamping trimming, when punching out metal sheet samples from thin sheet materials, problems such as stamping flanging and burrs are prone to occur on the edges of the samples, thus affecting the quality of the prepared samples. Therefore, there is an urgent need for a sheet punching device with a simple structure, a stable stamping structure, and no flanging of the sheet samples. Summary of the Invention

[0003] The purpose of the utility model is to overcome the above-mentioned shortcomings and provide a thin sheet punching device with a simple structure, a stable punching structure and high quality of the edge of the thin sheet sample.

[0004] The purpose of this utility model is achieved in this way:

[0005] A thin sheet punching device comprises a punch needle fixing seat and a base on which a punch needle is installed. A guide sleeve fixing seat with a C-shaped structure is fixed on the base, and a punch needle guide sleeve and a punch seat ejector guide sleeve are respectively fixed on the upper and lower C-shaped support arms of the guide sleeve fixing seat; the central axes of the punch needle guide sleeve and the punch seat ejector guide sleeve are coaxially arranged; the punch needle is slidably embedded in the punch needle guide sleeve, and the punch end face of the punch needle is concavely arranged.

[0006] Furthermore, the upper and lower C-shaped arms of the guide sleeve fixing seat are processed by reaming to form the upper and lower mounting holes at one time, thereby ensuring the concentricity of the upper and lower mounting holes.

[0007] Furthermore, the upper and lower mounting holes of the punch needle guide sleeve, punch seat ejector guide sleeve and guide sleeve fixing seat are all interference fitted.

[0008] Furthermore, a punch needle return spring is sleeved on the punch needle between the punch needle fixing seat and the punch needle guide sleeve.

[0009] Furthermore, an ejector pin is slidably embedded in the ejector pin guide sleeve of the punch seat, and an ejector pin reset spring is installed in the base at the bottom of the ejector pin.

[0010] Furthermore, when the ejector pin is ejected and reset by the ejector pin reset spring, the top surface of the ejector pin is higher than the top surface of the punch seat ejector pin guide sleeve.

[0011] Furthermore, the punch of the punch needle has a circular cross section, and the concave portion of the end face of the punch is a concave spherical surface.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] The utility model ensures the concentricity of each punching of the punch needle and the punch cutting accuracy by arranging concentric punch needle guide sleeves and punch seat ejector pin guide sleeves on the C-shaped guide sleeve fixing seat; an inner concave structure is arranged at the punch head end of the punch needle, so that when the metal sheet material is punched, the edge of the sheet is ensured to be compacted without tensile deformation, the thinning of the edge is slowed down, and the occurrence of flanging or burrs is prevented; the overall structure is simple, the stamping structure is stable and accurate, and the edge quality of the sheet sample is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Fig. 1 The utility model is a structural schematic diagram of a thin sheet punching device.

[0015] Fig. 2 The utility model is a schematic diagram of the punching needle structure of a thin sheet punching device.

[0016] in:

[0017] Punch needle return spring 1, punch needle guide sleeve 2, punch needle 3, ejector pin 4, punch seat ejector guide sleeve 5, punch needle fixing seat 6, guide sleeve fixing seat 7, ejector needle return spring 8, base 9, concave spherical surface 10. DETAILED DESCRIPTION

[0018] See also Figs. 1-2 The utility model relates to a thin sheet punching device, comprising a punch needle fixing seat 6 on which a punch needle 3 is installed, a base 9, a guide sleeve fixing seat 7 with a C-shaped structure fixed on the base 9, a punch needle guide sleeve 2 and a punch seat ejector guide sleeve 5 respectively fixed on the upper and lower C-shaped support arms of the guide sleeve fixing seat 7;

[0019] The upper and lower C-shaped arms of the guide sleeve fixing seat 7 are processed and formed into the upper and lower mounting holes at one time by reaming, thereby ensuring the concentricity of the upper and lower mounting holes; the punch needle guide sleeve 2 and the punch seat ejector guide sleeve 5 are interference fitted into the upper and lower mounting holes of the guide sleeve fixing seat 7 by the cold installation method; through the above-mentioned processing and installation method, it is ensured that the central axes of the punch needle guide sleeve 2 and the punch seat ejector guide sleeve 5 are coaxially arranged, and the stamping accuracy of the punch needle 3 when punching into the punch seat ejector guide sleeve 5 is ensured, thereby ensuring the uniformity of the force on the metal sheet during the stamping process, and preventing the metal sheet from having local burrs and flanging;

[0020] The punching needle 3 is slidably embedded in the punching needle guide sleeve 2, and a punching needle reset spring 1 is installed on the punching needle 3 between the punching needle fixing seat 6 and the punching needle guide sleeve 2 to ensure that the punching needle 3 can complete the reset action by itself after each punching;

[0021] The ejector pin 4 is slidably embedded in the punch seat ejector pin guide sleeve 5, and an ejector pin reset spring 8 is installed in the base 9 at the bottom of the ejector pin 4; when the ejector pin 4 is ejected and reset by the ejector pin reset spring 8, the top surface of the ejector pin 4 is higher than the top surface of the punch seat ejector pin guide sleeve 5; after the punching action is completed, the ejector pin reset spring 8 resets the ejector pin 4 to a state of extending a small section from the top surface of the punch seat ejector pin guide sleeve 5, ejecting the punched metal sheet sample to facilitate subsequent sheet removal;

[0022] Since the edge of most samples is not within the required usage range, the edge is slightly squeezed and deformed due to the punching pressure, which is different from the internal position of the thin sheet. Since the range of the squeezed circular edge is extremely narrow, it does not affect the subsequent sample preparation. The traditional punch end face of the needle 3 is a flat structure, that is, a non-concave design. During punching, the edge of the sample is stretched and deformed, which will cause the circular edge to thin rapidly, while the thickness of the center of the sample remains unchanged. If the edge is thinned to a size smaller than the gap between the needle 3 and the punch seat ejector guide sleeve 5, the edge will flanging. Therefore, the utility model sets the punch end face of the needle 3 to be concave. In this embodiment, the punch of the needle 3 is circular in cross section, and the concave part of the punch end face is a concave spherical surface 10, forming a punch with an annular structure. A concave structure is set at the punch end of the needle to ensure that the edge of the thin sheet is compacted without tensile deformation during punching, slowing down the thinning of the edge and preventing flanging or burrs.

[0023] In addition: It should be noted that the above specific implementation is only an optimization scheme of this patent. Any changes or improvements made by technicians in this field based on the above concept are within the scope of protection of this patent.

Claims

1. A thin sheet punching device, comprising a punching needle fixing seat (6) on which a punching needle (3) is mounted, and a base (9), characterized in that: A guide sleeve fixing seat (7) having a C-shaped structure, a punch needle guide sleeve (2) and a punch seat ejector guide sleeve (5) respectively fixed on the upper and lower C-shaped support arms of the guide sleeve fixing seat (7); the central axes of the punch needle guide sleeve (2) and the punch seat ejector guide sleeve (5) are coaxially arranged; the punch needle (3) is slidably embedded in the punch needle guide sleeve (2), and the punch end face of the punch needle (3) is concavely arranged.

2. The thin sheet punching device according to claim 1, characterized in that: The upper and lower C-shaped arms of the guide sleeve fixing seat (7) are processed into upper and lower mounting holes at one time by reaming, thereby ensuring the concentricity of the upper and lower mounting holes.

3. The thin sheet punching device according to claim 2, characterized in that: The upper and lower mounting holes of the punch needle guide sleeve (2), the punch seat ejector guide sleeve (5) and the guide sleeve fixing seat (7) are all interference fitted.

4. The thin sheet punching device according to claim 1, characterized in that: A punch needle return spring (1) is sleeved on the punch needle (3) between the punch needle fixing seat (6) and the punch needle guide sleeve (2).

5. The thin sheet punching device according to claim 1, characterized in that: An ejector pin (4) is slidably embedded in the ejector pin guide sleeve (5) of the punch seat, and an ejector pin return spring (8) is installed in the base (9) at the bottom of the ejector pin (4).

6. The thin sheet punching device according to claim 5, characterized in that: When the ejector pin (4) is ejected and reset by the ejector pin reset spring (8), the top surface of the ejector pin (4) is higher than the top surface of the punch seat ejector pin guide sleeve (5).

7. The thin sheet punching device according to claim 1, characterized in that: The punch of the punch needle (3) has a circular cross section, and the inner concave portion of the punch end face is an inner concave spherical surface (10).

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