Punching device of a punch press

Abstract

The utility model discloses a punch press's stamping device contains an outer shell, a punch and a piston. The outer shell includes a casing and a lower cover. The casing forms a containing space, and the containing space has a lower opening downward. The casing has a first stop surface facing the lower opening and spaced above the lower opening, and the lower cover is detachably assembled on the bottom of the casing and closes the lower opening. The punch is arranged at the bottom end of the outer shell. The piston is arranged in the containing space and between the first stop surface and the lower cover, and the piston can be lifted and abutted against the first stop surface. The first stop surface of the casing of the outer shell is used as a stop structure for stopping the piston, so that the structural strength of the first stop surface is strong, the piston can be stably stopped, and the deformation amount of the piston after stress can be reduced.

Description

Technical Field

[0001] This utility model relates to a punch press, and more particularly to a punching device for a punch press having a piston and capable of stopping the piston. Background Technology

[0002] Existing punch presses use a stop mechanism to restrain a piston, limiting its position after it is lifted. Because this stop mechanism has multiple stopping components, assembling these components within a housing is inconvenient and time-consuming. Furthermore, as the stopping components age, wear between them and the housing gradually increases, leading to a widening gap. This can cause the stopping components to loosen within the housing and fail to securely stop the piston. Moreover, the use of these stopping components increases the overall manufacturing cost of the punch press. Additionally, because the clearance between the stopping components and the housing is extremely small, once the clearance becomes large enough, it becomes impossible to simply remanufacture identical parts by machining. Instead, pre-fabrication of the parts to be assembled is necessary, resulting in extremely high maintenance costs. Utility Model Content

[0003] To solve the above-mentioned technical problems, the present invention provides a stamping device for a punch press that can overcome at least one disadvantage of the prior art.

[0004] The technical solution of this utility model is:

[0005] A punching device for a punch press includes a housing, a punch, and a piston.

[0006] The housing includes a shell and a lower cover. The shell forms a receiving space with a downward-facing lower opening. The shell has a first stop surface facing the lower opening and spaced above it. The lower cover is detachably assembled to the bottom of the shell and closes the lower opening. A punch is disposed at the bottom end of the shell. A piston is disposed within the receiving space and between the first stop surface and the lower cover; the piston can be lifted and abut against the first stop surface.

[0007] In some embodiments, the accommodating space further has a first aperture portion and a second aperture portion communicating with the bottom of the first aperture portion, the aperture of the second aperture portion being larger than the aperture of the first aperture portion, the first stop surface being formed between the first aperture portion and the second aperture portion and being annular in shape, and the piston being accommodated in the second aperture portion.

[0008] In some embodiments, the stamping device further includes a sealing unit, the sealing unit including a first sealing gasket that is liquid-tightly disposed between the housing and the piston.

[0009] In some embodiments, the sealing unit further includes a second sealing gasket that is liquid-tightly disposed between the housing and the piston and spaced below the first sealing gasket.

[0010] In some embodiments, a wear-resistant ring is further included, disposed between the housing and the piston and spaced apart from the first sealing gasket.

[0011] In some embodiments, the housing further forms a first annular groove and an annular groove spaced apart from the first annular groove, the first sealing gasket is received in the first annular groove, the wear-resistant ring is received in the annular groove, and the sealing unit further includes a first back support gasket received in the first annular groove and abutting against the top of the first sealing gasket.

[0012] In some embodiments, the housing is further formed with a second annular groove spaced below the first annular groove, the annular groove being spaced between the first annular groove and the second annular groove, and the sealing unit further includes a second sealing gasket liquid-tightly disposed between the housing and the piston and accommodated in the second annular groove, and a second back support gasket accommodated in the second annular groove and abutting the top of the second sealing gasket.

[0013] In some embodiments, the piston includes an outer peripheral surface with a first annular groove recessed therein and a second annular groove spaced below the first annular groove. The first sealing gasket and the second sealing gasket are respectively accommodated in the first annular groove and the second annular groove. The sealing unit further includes a first back support gasket accommodated in the first annular groove and abutting against the top of the first sealing gasket, and a second back support gasket accommodated in the second annular groove and abutting against the top of the second sealing gasket.

[0014] In some embodiments, the housing further has an internal threaded section, and the lower cover has an external threaded section screwed into the internal threaded section.

[0015] In some embodiments, the stamping device further includes a sealing unit comprising a sealing gasket liquid-tightly disposed between the housing and the lower cover.

[0016] In some embodiments, the accommodating space further includes a first aperture portion, a second aperture portion communicating with the bottom of the first aperture portion, and a third aperture portion communicating with the bottom of the second aperture portion. The aperture of the second aperture portion is larger than the aperture of the first aperture portion. A first stop surface is formed between the first aperture portion and the second aperture portion and is annular in shape. The aperture of the third aperture portion is larger than the aperture of the second aperture portion. The third aperture portion has the lower opening. The internal thread segment surrounds the third aperture portion. The housing further includes a second stop surface formed between the second aperture portion and the third aperture portion and is annular in shape. The piston is accommodated in the second aperture portion. The lower cover is accommodated in the third aperture portion and abuts against the second stop surface.

[0017] In some embodiments, the lower cover has a lower cover body and an upper cover body protruding from the top of the lower cover body. The lower cover body is received in the third aperture portion and closes the lower opening. The lower cover body has the external threaded section and a top abutting surface surrounding the upper cover body and abutting against the second stop surface. The upper cover body is received in the second aperture portion and has an outer peripheral surface. The outer peripheral surface is recessed to form an annular groove. The stamping device further includes a sealing unit. The sealing unit includes a sealing gasket that is liquid-tightly disposed between the housing and the upper cover body and received in the annular groove, and a back support gasket that is received in the annular groove and abuts against the bottom end of the sealing gasket.

[0018] In some embodiments, the housing further includes a plurality of locking screws that secure the lower cover to the housing.

[0019] In some embodiments, the stamping device further includes a sealing unit comprising a sealing gasket liquid-tightly disposed between the housing and the lower cover.

[0020] In some embodiments, the accommodating space further includes a first aperture portion, a second aperture portion communicating with the bottom of the first aperture portion, and a third aperture portion communicating with the bottom of the second aperture portion. The aperture of the second aperture portion is larger than the aperture of the first aperture portion. A first stop surface is formed between the first aperture portion and the second aperture portion and is annular in shape. The aperture of the third aperture portion is larger than the aperture of the second aperture portion. The third aperture portion has the lower opening. The housing further includes a second stop surface formed between the second aperture portion and the third aperture portion and is annular in shape. The second stop surface is recessed and has a plurality of spaced-apart screw holes. The piston is accommodated in the second aperture portion. The lower cover is accommodated in the third aperture portion and abuts against the second stop surface. The lower cover has a plurality of through holes respectively communicating with the screw holes. Each locking screw passes through the corresponding through hole and is screwed into the corresponding screw hole.

[0021] In some embodiments, the lower cover has a lower cover body and an upper cover body protruding from the top of the lower cover body. The lower cover body is received in the third aperture portion and closes the lower opening. The lower cover body has the perforations. The lower cover body has a top abutting surface surrounding the upper cover body and abutting against the second stop surface. The top abutting surface is recessed to form an annular groove. The upper cover body is received in the second aperture portion. The stamping device further includes a sealing unit. The sealing unit includes a sealing gasket that is liquid-tightly disposed between the housing and the lower cover body and received in the annular groove.

[0022] In some embodiments, the stamping device further includes a threaded sleeve, a screw, a pivot member, and a transmission mechanism. The screw is threaded to the threaded sleeve and can rotate and move up and down relative to the threaded sleeve. The screw includes a ball head housed within the receiving space. The pivot member is disposed within the receiving space and pivotally connected to the ball head and located above the piston. The transmission mechanism is disposed in the housing and connected to the ball head and can be driven to rotate the ball head.

[0023] The beneficial technical effects of this utility model are as follows: By using the first stop surface of the housing as the stop structure to stop the piston, the first stop surface has strong structural strength and can stably stop the piston, and can reduce the deformation of the piston under force. Furthermore, there is no need to assemble multiple additional stop components inside the housing to stop the piston, thereby avoiding the inconvenience and time-consuming assembly problems caused by assembling such stop components, and also avoiding loosening problems caused by wear between such stop components and the housing, and reducing the overall manufacturing cost of the stamping device. Moreover, by detachably assembling the lower cover to the housing, the piston and the lower cover can be easily and quickly assembled to or removed from the housing. This allows for convenient and quick maintenance or replacement of the piston and the sealing unit. Attached Figure Description

[0024] Figure 1 This is a cross-sectional view of a first embodiment of the stamping device of the present invention and a working platform, illustrating the assembly relationship between a housing, a punch, a threaded sleeve, a screw, a pivot, a transmission mechanism, a piston, a conveying connector, a sealing unit and a wear-resistant ring;

[0025] Figure 2 This is an incomplete exploded perspective view of the first embodiment;

[0026] Figure 3 yes Figure 1 A magnified view of a portion;

[0027] Figure 4 This is an incomplete cross-sectional view of a second embodiment of the stamping device of the present novel punch press;

[0028] Figure 5 This is an incomplete exploded perspective view of the second embodiment; and

[0029] Figure 6 yes Figure 4 A magnified view of a portion of the image.

[0030] Figure label:

[0031] 1: Outer shell

[0032] 11: Shell

[0033] 110: Storage space

[0034] 111: First aperture section

[0035] 112: Second aperture section

[0036] 113: Third aperture section

[0037] 114: Fourth aperture section

[0038] 115: Lower opening

[0039] 116: First stop surface

[0040] 117: Second stop surface

[0041] 118: Internal thread section

[0042] 119: Conveying Hole

[0043] 120: Inner circumferential surface

[0044] 121: First annular groove

[0045] 122: Second annular groove

[0046] 123: Annular groove

[0047] 13: Lower cap

[0048] 131: Lower cover

[0049] 132: Upper cover

[0050] 133: External thread section

[0051] 134: Top and bottom surfaces

[0052] 135: Outer Peripheral Surface

[0053] 136: Annular groove

[0054] 14: Top Cover

[0055] 141: Through hole

[0056] 4: Screw

[0057] 41: Screw section

[0058] 42: Ball head

[0059] 5: Pivot connector

[0060] 51: Arc-shaped groove

[0061] 6: Transmission mechanism

[0062] 61: Worm Gear

[0063] 62: Connecting pin assembly

[0064] 63: Worm gear

[0065] 7: Piston

[0066] 71: Outer Peripheral Surface

[0067] 8: Conveyor Connector

[0068] 81: Conveyor Hole

[0069] 91: First sealing gasket

[0070] 92: Second sealing gasket

[0071] 93: Sealing gasket

[0072] 94: First back support pad

[0073] 95: Second back support pad

[0074] 96: Back support pad

[0075] 10: Wear-resistant ring Detailed Implementation

[0076] In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0077] See Figure 1 and Figure 2 A first embodiment of the stamping device 100 of this novel punch press is suitable for stamping a workpiece (not shown) placed on a work platform 101. The stamping device 100 includes a housing 1, a punch 2, a threaded sleeve 3, a screw 4, a pivot 5, a transmission mechanism 6, a piston 7, a conveying connector 8, a sealing unit 9, and a wear-resistant ring 10.

[0078] See Figure 1 , Figure 2 and Figure 3The outer casing 1 includes a housing 11, a lower cover 13, and a upper cover 14. The housing 11 forms an accommodating space 110. The accommodating space 110 has a first aperture portion 111, a second aperture portion 112, a third aperture portion 113, and a fourth aperture portion 114. The second aperture portion 112 communicates with the bottom of the first aperture portion 111. The diameter of the second aperture portion 112 is larger than the diameter of the first aperture portion 111. The third aperture portion 113 communicates with the bottom of the second aperture portion 112. The diameter of the third aperture portion 113 is larger than the diameter of the second aperture portion 112. The fourth aperture portion 114 communicates with the top of the first aperture portion 111. The diameter of the fourth aperture portion 114 is larger than the diameter of the first aperture portion 111. The third aperture portion 113 has a downward-facing lower opening 115. The housing 11 has a first stop surface 116 formed in an annular shape between the first aperture portion 111 and the second aperture portion 112, and a second stop surface 117 formed in an annular shape between the second aperture portion 112 and the third aperture portion 113. The first stop surface 116 and the second stop surface 117 each face the lower opening 115 and are spaced above the lower opening 115.

[0079] The lower cover 13 is detachably assembled to the bottom of the housing 11 and closes the lower opening 115. In this first embodiment, the housing 11 also has an internally threaded section 118 surrounding the third aperture portion 113. The lower cover 13 has a lower cover body 131 and an upper cover body 132. The lower cover body 131 is received in the third aperture portion 113 and abuts against the second stop surface 117 and closes the lower opening 115. The lower cover body 131 has an externally threaded section 133 screwed to the internally threaded section 118. Thus, the lower cover 13 can be detachably assembled to the housing 11 by means of threaded connection. The upper cover body 132 protrudes from the top of the lower cover body 131 and the outer diameter of the upper cover body 132 is smaller than the outer diameter of the lower cover body 131. The upper cover body 132 is received in the second aperture portion 112. The lower cover 131 has a top abutting surface 134 that surrounds the upper cover 132 and abuts against the second stop surface 117. The upper cover 14 is detachably assembled to the top of the housing 11. The upper cover 14 has a through hole 141 communicating with the fourth aperture portion 114.

[0080] The punch 2 is detachably mounted on the bottom end of the housing 1 for stamping the workpiece. The threaded sleeve 3 is pivotally connected to a crankshaft (not shown) and located above the housing 1. The threaded sleeve 3 has a threaded hole 31. The screw 4 includes a screw portion 41 and a ball head 42. The screw portion 41 is screwed into the threaded hole 31 and passes through the through hole 141 of the upper cover 14, allowing the screw 4 to rotate and move up and down relative to the threaded sleeve 3. The ball head 42 is formed at the bottom end of the screw portion 41 and is received within the first aperture portion 111 and the fourth aperture portion 114 of the receiving space 110. The ball head 42 abuts against the upper cover 14. The pivot member 5 is disposed within the first aperture portion 111 of the receiving space 110. The pivot member 5 has an arc-shaped groove 51 pivotally connected to the ball head 42. The ball head 42 is rotatably abutted against the pivot 5 and is limited by the pivot 5 and the upper cover 14, so that the screw 4 can swing relative to the pivot 5 through the ball head 42 during the stamping process of the stamping device 100.

[0081] The transmission mechanism 6 includes a worm gear 61, two connecting pin sets 62, and a worm 63. The worm gear 61 is rotatably disposed within the fourth aperture portion 114 of the accommodating space 110. The worm gear 61 is sleeved on the ball head 42 and located between the pivot member 5 and the upper cover 14. The connecting pin sets 62 are fixedly connected between the worm gear 61 and the ball head 42. The worm 63 is rotatably pivotally connected to the housing 11 and meshes with the worm gear 61. The worm 63 is connected to a drive mechanism (not shown) and can be driven to rotate by the drive mechanism. When the worm 63 rotates, it drives the worm gear 61 to rotate. During the rotation of the worm gear 61, the ball head 42 is rotated through the connecting pin sets 62, so that the screw 4 can move upward to screw into the sleeve 3 or move downward to screw out of the sleeve 3. In this way, the screw 4 can drive the punch 2 to move up or down through the housing 1, so as to adjust the distance between the punch 2 and the working platform 101.

[0082] The piston 7 is disposed within the second aperture portion 112 of the accommodating space 110 and is located between the first stop surface 116 and the lower cover 13. The piston 7 can be lifted and abutted against the first stop surface 116. The piston 7 includes an outer peripheral surface 71.

[0083] The housing 11 also has a delivery hole 119 communicating with the second aperture portion 112 of the accommodating space 110. The delivery connector 8 is disposed on one side of the housing 11 and has a delivery hole 81 communicating with the delivery hole 119. The delivery connector 8 is connected to a hydraulic oil supply source (not shown). The hydraulic oil (not shown) supplied by the hydraulic oil supply source can flow sequentially through the delivery hole 81 and the delivery hole 119 into the second aperture portion 112 between the lower cover 13 and the piston 7, so that the hydraulic oil can lift the piston 7 upward so that it abuts against the first stop surface 116.

[0084] The sealing unit 9 includes a first sealing gasket 91, a second sealing gasket 92, and a sealing gasket 93. Each of the first, second, and third sealing gaskets is made of an elastic material such as rubber or silicone. The first sealing gasket 91 is fluid-tightly disposed between the housing 11 and the piston 7. The second sealing gasket 92 is fluid-tightly disposed between the housing 11 and the piston 7, spaced below the first sealing gasket 91. The first and second sealing gaskets 91 and 92 prevent hydraulic oil in the second aperture portion 112 from seeping upwards into the first aperture portion 111. The design of these two sealing elements, the first and second sealing gaskets 91 and 92, ensures a good fluid-tight seal between the housing 11 and the piston 7. The sealing gasket 93 is fluid-tightly disposed between the housing 11 and the lower cover 13. The sealing gasket 93 is used to prevent the hydraulic oil in the second orifice 112 from seeping downwards into the third orifice 113. It should be noted that in another embodiment of this first embodiment, the second sealing gasket 92 can be omitted, so that the housing 11 and the piston 7 achieve a liquid-tight effect through only a single sealing element, the first sealing gasket 91, and is not limited to the method of using two sealing elements disclosed above.

[0085] In this first embodiment, the housing 11 further includes an inner peripheral surface 120 connecting the first stop surface 116 and the second stop surface 117. The inner peripheral surface 120 has a recessed first annular groove 121 and a second annular groove 122 spaced below the first annular groove 121. The first sealing gasket 91 and the second sealing gasket 92 are respectively accommodated in the first annular groove 121 and the second annular groove 122 and abut against the outer peripheral surface 71 of the piston 7. The upper cover 132 of the lower cover 13 has an outer peripheral surface 135. The outer peripheral surface 135 has a recessed annular groove 136. The sealing gasket 93 is accommodated in the annular groove 136 and abuts against the inner peripheral surface 120 of the housing 11, such that the sealing gasket 93 is liquid-tightly disposed between the housing 11 and the upper cover 132.

[0086] Specifically, the sealing unit 9 further includes a first back support washer 94, a second back support washer 95, and a back support washer 96. The first back support washer 94 is housed in the first annular groove 121 and abuts against the top of the first sealing washer 91. The first back support washer 94 supports the first sealing washer 91 to prevent it from deforming under pressure and dislodging from the first annular groove 121. The second back support washer 95 is housed in the second annular groove 122 and abuts against the top of the second sealing washer 92. The second back support washer 95 supports the second sealing washer 92 to prevent it from deforming under pressure and dislodging from the second annular groove 122. The back support washer 96 is housed in the annular groove 136 and abuts against the bottom of the sealing washer 93. The back support washer 96 supports the sealing washer 93 to prevent it from deforming under pressure and dislodging from the annular groove 136.

[0087] It should be noted that in another embodiment of this first embodiment, the inner circumferential surface 120 of the housing 11 may be recessed to form an annular groove for accommodating the sealing gasket 93 and the back support gasket 96, and is not limited to the aforementioned disclosure method.

[0088] The wear-resistant ring 10 is disposed between the housing 11 and the piston 7, and spaced apart from the first sealing gasket 91 and the second sealing gasket 92. The wear-resistant ring 10 prevents scratches and metal filings from being generated due to friction between the outer peripheral surface 71 of the piston 7 and the inner peripheral surface 120 of the housing 11, thereby preventing damage to the first sealing gasket 91 or the second sealing gasket 92 by metal filings. In this first embodiment, the inner peripheral surface 120 of the housing 11 is also recessed to form an annular groove 123 spaced between the first annular groove 121 and the second annular groove 122. The wear-resistant ring 10 is accommodated in the annular groove 123.

[0089] To assemble the piston 7 and the lower cover 13 into the housing 11, first align the piston 7 with the lower opening 115 of the housing 11. Then, move the piston 7 upwards, allowing it to pass through the lower opening 115 into the third aperture portion 113 of the accommodating space 110, and then into the second aperture portion 112. When the piston 7 abuts against and is stopped by the first stop surface 116, the piston 7 is positioned within the second aperture portion 112. Next, align the lower cover 13 with the lower opening 115 of the housing 11. Then, move the lower cover 13 upwards and screw it into the housing 11, so that the external threaded section 133 of the lower cover 13 is screwed into the internal threaded section 118 of the housing 11. When the top abutting surface 134 of the lower cover body 131 of the lower cover 13 abuts against the second stop surface 117 and is stopped by the second stop surface 117, the lower cover body 131 and the upper cover body 132 of the lower cover 13 are respectively positioned in the third aperture portion 113 and the second aperture portion 112. At this time, the assembly of the piston 7 and the lower cover 13 is completed.

[0090] To remove the piston 7 and the lower cover 13 from the housing 11, first rotate the lower cover 13 in the opposite direction to unscrew it from the housing 11. When the external thread section 133 separates from the internal thread section 118, the lower cover 13 can be removed from the housing 11. Then, move the piston 7 downwards, allowing it to move out of the receiving space 110 through the lower opening 115. At this point, the removal of the piston 7 and the lower cover 13 is complete.

[0091] See Figure 4 , Figure 5 and Figure 6 A second embodiment of the stamping device 100 of the new punch press has a general structure that is similar to that of the first embodiment, except that the lower cover 13 is assembled into the housing 11 in a certain way and the sealing unit 9 is different.

[0092] The housing 1 also includes a plurality of locking screws 15 for securing the lower cover 13 to the housing 11. The second stop surface 117 of the housing 11 has a plurality of spaced-apart screw holes 124 for each of the locking screws 15 to be screwed in. The lower cover body 131 of the lower cover 13 has a plurality of through holes 137 that communicate with the screw holes 124. Each locking screw 15 passes through a corresponding through hole 137 and is screwed into a corresponding screw hole 124 to secure the lower cover 13 to the housing 11. Thus, the lower cover 13 can be detachably assembled to the housing 11 by screwing in the locking screws 15.

[0093] The top abutment surface 134 of the lower cover 13 is recessed to form the annular groove 136. The sealing gasket 93 is accommodated in the annular groove 136 and abuts against the second stop surface 117. The outer peripheral surface 71 of the piston 7 is recessed to form a first annular groove 72 and a second annular groove 73 located below the first annular groove 72. The first sealing gasket 91 and the second sealing gasket 92 are respectively accommodated in the first annular groove 72 and the second annular groove 73 and abut against the inner peripheral surface 120 of the housing 11. The first back support gasket 94 and the second back support gasket 95 are respectively accommodated in the first annular groove 72 and the second annular groove 73. Thus, this second embodiment provides another assembly position for the first sealing gasket 91, the second sealing gasket 92, the sealing gasket 93, the first back support gasket 94, and the second back support gasket 95.

[0094] It should be noted that in another embodiment of this second embodiment, the second stop surface 117 of the housing 11 may be recessed to form an annular groove for the sealing gasket 93 to be accommodated, and is not limited to the aforementioned disclosure method.

[0095] In summary, the stamping apparatus 100 of each embodiment uses the first stop surface 116 of the housing 11 of the outer shell 1 as a stop structure to stop the piston 7. This results in the first stop surface 116 having strong structural strength and being able to firmly stop the piston 7, while also reducing the deformation of the piston 7 under stress. Furthermore, the housing 11 does not require the additional assembly of multiple stop components to stop the piston 7, thereby avoiding the inconvenience and time-consuming assembly problems associated with assembling such stop components. It also avoids loosening problems caused by wear between the stop components and the housing 11, and reduces the overall manufacturing and maintenance costs of the stamping apparatus 100. Moreover, the lower cover 13 is detachably assembled to the housing 11, allowing the piston 7 and the lower cover 13 to be easily and quickly assembled to or removed from the housing 11. This allows for convenient and quick maintenance or replacement of the piston 7 and the sealing unit 9, thus effectively achieving the purpose of this new type of product.

[0096] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A stamping device for a punch press, characterized in that, Include: An outer casing includes a housing and a lower cover, the housing forming an accommodating space having a downwardly facing lower opening, the housing having a first stop surface facing the lower opening and spaced above the lower opening, and the lower cover being detachably assembled to the bottom of the housing and closing the lower opening; A punch is located at the bottom of the housing; and A piston is disposed within the accommodating space and located between the first stop surface and the lower cover. The piston can be lifted and pressed against the first stop surface.

2. The stamping device for a punch press according to claim 1, characterized in that, in, The accommodating space also has a first aperture portion and a second aperture portion connected to the bottom of the first aperture portion. The aperture of the second aperture portion is larger than the aperture of the first aperture portion. The first stop surface is formed between the first aperture portion and the second aperture portion and is annular in shape. The piston is accommodated in the second aperture portion.

3. The stamping device for a punch press according to claim 2, characterized in that, It also includes a sealing unit, which includes a first sealing gasket that is liquid-tightly disposed between the housing and the piston.

4. The stamping device for a punch press according to claim 3, characterized in that, in, The sealing unit also includes a second sealing gasket that is liquid-tightly disposed between the housing and the piston and spaced below the first sealing gasket.

5. The stamping device for a punch press according to claim 3, characterized in that, It also includes a wear-resistant ring disposed between the housing and the piston and spaced apart from the first sealing gasket.

6. The stamping device for a punch press according to claim 5, characterized in that, in, The housing also forms a first annular groove and an annular groove spaced apart from the first annular groove. The first sealing gasket is housed in the first annular groove, and the wear-resistant ring is housed in the annular groove. The sealing unit also includes a first back support gasket housed in the first annular groove and abutting against the top of the first sealing gasket.

7. The stamping device for a punch press according to claim 6, characterized in that, in, The housing also has a second annular groove spaced below the first annular groove. The annular groove is spaced between the first annular groove and the second annular groove. The sealing unit also includes a second sealing gasket that is liquid-tightly disposed between the housing and the piston and housed in the second annular groove, and a second back support gasket that is housed in the second annular groove and abuts against the top of the second sealing gasket.

8. The stamping device for a punch press according to claim 4, characterized in that, in, The piston includes an outer peripheral surface with a first annular groove recessed therein, and a second annular groove spaced below the first annular groove. The first sealing gasket and the second sealing gasket are respectively housed in the first annular groove and the second annular groove. The sealing unit also includes a first back support gasket housed in the first annular groove and abutting against the top of the first sealing gasket, and a second back support gasket housed in the second annular groove and abutting against the top of the second sealing gasket.

9. The stamping device for a punch press according to claim 1, characterized in that, in, The housing also has an internal threaded section, and the lower cover has an external threaded section screwed into the internal threaded section.

10. The stamping device for a punch press according to claim 9, characterized in that, It also includes a sealing unit comprising a sealing gasket that is liquid-tightly disposed between the housing and the lower cover.

11. The stamping device for a punch press according to claim 9, characterized in that, in, The accommodating space also has a first aperture portion, a second aperture portion communicating with the bottom of the first aperture portion, and a third aperture portion communicating with the bottom of the second aperture portion. The aperture of the second aperture portion is larger than the aperture of the first aperture portion. The first stop surface is formed between the first aperture portion and the second aperture portion and is annular in shape. The aperture of the third aperture portion is larger than the aperture of the second aperture portion. The third aperture portion has the lower opening. The internal thread segment surrounds the third aperture portion. The housing also has a second stop surface formed between the second aperture portion and the third aperture portion and is annular in shape. The piston is accommodated in the second aperture portion. The lower cover is accommodated in the third aperture portion and abuts against the second stop surface.

12. The stamping device for a punch press according to claim 11, characterized in that, in, The lower cover has a lower cover body and an upper cover body protruding from the top of the lower cover body. The lower cover body is accommodated in the third aperture portion and closes the lower opening. The lower cover body has the external threaded section and a top abutting surface surrounding the upper cover body and abutting against the second stop surface. The upper cover body is accommodated in the second aperture portion and has an outer peripheral surface. The outer peripheral surface is recessed to form an annular groove. The stamping device also includes a sealing unit. The sealing unit includes a sealing gasket that is liquid-tightly disposed between the housing and the upper cover body and accommodated in the annular groove, and a back support gasket that is accommodated in the annular groove and abuts against the bottom end of the sealing gasket.

13. The stamping device for a punch press according to claim 1, characterized in that, in, The housing also includes a plurality of locking screws that secure the lower cover to the housing.

14. The stamping device for a punch press according to claim 13, characterized in that, It also includes a sealing unit comprising a sealing gasket that is liquid-tightly disposed between the housing and the lower cover.

15. The stamping device for a punch press according to claim 13, characterized in that, in, The accommodating space also has a first aperture portion, a second aperture portion communicating with the bottom of the first aperture portion, and a third aperture portion communicating with the bottom of the second aperture portion. The aperture of the second aperture portion is larger than the aperture of the first aperture portion. A first stop surface is formed between the first aperture portion and the second aperture portion and is annular in shape. The aperture of the third aperture portion is larger than the aperture of the second aperture portion. The third aperture portion has the lower opening. The housing also has a second stop surface formed between the second aperture portion and the third aperture portion and is annular in shape. The second stop surface is recessed to form a plurality of spaced screw holes. The piston is accommodated in the second aperture portion. The lower cover is accommodated in the third aperture portion and abuts against the second stop surface. The lower cover has a plurality of through holes respectively communicating with the screw holes. Each locking screw passes through the corresponding through hole and is screwed into the corresponding screw hole.

16. The stamping device for a punch press according to claim 15, characterized in that, in, The lower cover has a lower cover body and an upper cover body protruding from the top of the lower cover body. The lower cover body is received in the third aperture portion and closes the lower opening. The lower cover body has the perforations. The lower cover body has a top abutting surface surrounding the upper cover body and abutting against the second stop surface. The top abutting surface is recessed to form an annular groove. The upper cover body is received in the second aperture portion. The stamping device also includes a sealing unit. The sealing unit includes a sealing gasket that is liquid-tightly disposed between the housing and the lower cover body and received in the annular groove.

17. The stamping device for a punch press according to any one of claims 1-16, characterized in that, It also includes a threaded sleeve, a screw, a pivot member, and a transmission mechanism. The screw is threaded to the threaded sleeve and can rotate and move up and down relative to the threaded sleeve. The screw includes a ball head housed in the receiving space. The pivot member is disposed in the receiving space and pivotally connected to the ball head and located above the piston. The transmission mechanism is disposed in the housing and connected to the ball head and can be driven to rotate the ball head.

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