Reverse chamfering structure of gasket stamping die

Abstract

The utility model discloses a reverse chamfering structure of a gasket stamping die, which comprises an upper die and a lower die which are oppositely arranged, and is characterized in that a plurality of reverse chamfering structures are arranged between the upper die and the lower die, and each reverse chamfering structure comprises a knock-out rod and a punch return rod which are embedded in the upper die in parallel; the transmission rod and the chamfering punch are embedded in the lower die in parallel, the conversion block is embedded in the lower die and makes contact with the lower end face of the transmission rod and the lower end face of the chamfering punch, after the transmission rod is pressed down by external force, the conversion block drives the chamfering punch to be lifted, after the chamfering punch is pressed down, the conversion block drives the transmission rod to be lifted, and the beating rod and the transmission rod are oppositely arranged up and down. The punch return rod and the chamfering punch are oppositely arranged up and down, and a return spring is arranged above the punch return rod. Pressing of a gasket material belt is achieved through the stripper plate and the lower base plate, reverse chamfering machining is achieved through the linkage structure, efficiency is high, and the size precision is guaranteed.

Description

Technical Field

[0001] The utility model relates to a die structure, in particular to a reverse chamfering structure of a gasket stamping die. Background Art

[0002] Automotive fastening systems often utilize a combination of rivet bolts, nuts, and washers. Washers primarily serve as end face isolation and wear-resistant components. To facilitate assembly, chamfers are often designed into the inner holes of these washers. The existing production process for these types of washers involves two steps: blanking with a punch and chamfering on a lathe. However, the current process suffers from low lathe chamfering efficiency, low dimensional accuracy, unstable product dimensions, and poor appearance.

[0003] In response to the defects of traditional processes, a patented high-precision and high-efficiency gasket chamfering forming device (application number 201710411608.7) provides a mold structure that realizes the synchronous processing of chamfering on the upper and lower sides through relatively arranged upper and lower chamfering punches. Although this structure can realize chamfering processing, some thinner gaskets are prone to deformation during stamping. In order to achieve synchronous chamfering of the upper and lower sides, the chamfering punch must extend out of the upper die / lower die. In this way, the material strip is not pressed when the chamfer is stamped again, and the punching pressure can easily cause the suspended material strip to deform, thereby affecting the product dimensional accuracy. Utility Model Content

[0004] The purpose of the utility model is to provide a reverse chamfering structure for a gasket stamping die, which realizes pressing of the gasket material strip through a stripper plate and a lower pad, and realizes reverse chamfering processing through a linkage structure, which is not only efficient but also ensures dimensional accuracy.

[0005] To achieve the above-mentioned object, the utility model provides the following technical solutions: a reverse chamfering structure of a gasket stamping die, comprising an upper die and a lower die arranged opposite to each other, a plurality of reverse chamfering structures being provided between the upper die and the lower die, the reverse chamfering structure comprising a hitting rod and a punch return rod embedded in parallel in the upper die, a transmission rod and a chamfering punch embedded in parallel in the lower die, and a conversion block embedded in the lower die and contacting the lower end surfaces of the transmission rod and the chamfering punch respectively, when the transmission rod is pressed down by an external force, the conversion block drives the chamfering punch to rise, when the chamfering punch is pressed down, the conversion block drives the transmission rod to rise, the hitting rod and the transmission rod are arranged opposite to each other in upper and lower directions, the punch return rod and the chamfering punch are arranged opposite to each other in upper and lower directions, and a return spring is provided above the punch return rod;

[0006] When the upper die is pressed down, the striking rod presses the transfer rod downward, the chamfering punch rises to chamfer the gasket in the opposite direction, and squeezes the punch return rod. When the upper die is lifted, the return spring squeezes the punch return rod downward, synchronously pressing the chamfering punch downward, and the transfer rod rises and resets synchronously.

[0007] Preferably, the conversion block is a semicircular structure, the middle position of which cooperates with the rotating shaft to assemble in the lower die, one end contacts the lower end of the transmission rod, and the other end contacts the lower end of the chamfering punch.

[0008] Preferably, the chamfering punch is composed of a limit block, a rod body and a positioning rod from one end to the other. The outer diameter of the limit block is larger than the rod body, the outer diameter of the rod is larger than the positioning rod, the outer diameter of the positioning rod is consistent with the inner hole of the gasket, and the connection between the positioning rod and the rod body is an arc chamfer.

[0009] Preferably, the upper die includes an upper die base, an upper pad, an upper cover plate, an upper clamping plate and a stripper plate from top to bottom. One end of the hitting rod is embedded in the upper cover plate, and the other end passes through the upper clamping plate and extends out of the stripper plate. The punch return rod is movably embedded in the inside of the stripper plate, and the upper end face is connected to the return spring embedded in the upper clamping plate.

[0010] Preferably, the lower die is composed of a lower die base, a lower pad and a lower mold plate from bottom to top, the conversion block is embedded in the lower die base, the transmission rod is movably embedded in the lower mold plate and the lower pad, and the lower end face is in contact with the conversion block, the chamfering punch is movably embedded in the lower mold plate, and contacts the conversion block in conjunction with the transmission rod movably embedded in the lower pad.

[0011] Compared with the prior art, the reverse chamfering structure of the gasket stamping die disclosed in the present invention has the following beneficial effects:

[0012] The semicircular conversion block is used in conjunction with the transfer rod and chamfering punch to achieve a seesaw-like linkage control, effectively achieving reverse chamfering processing;

[0013] The positioning rod structure set at the end of the chamfering punch is inserted into the center hole of the gasket for limiting before stamping the chamfer, ensuring the dimensional accuracy of the subsequent chamfer. At the same time, it cooperates with the upper return rod to realize the effective separation of the stamping chamfer and the gasket, avoiding deformation of the gasket caused by improper separation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a cross-sectional view of an embodiment of the utility model in an open state;

[0015] Figure 2 This is a cross-sectional view of an embodiment of the utility model in a closed state;

[0016] Figure 3 This is a structural diagram of the chamfering punch in an embodiment of the present utility model. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] like Figures 1 and 2 As shown, the utility model provides a reverse chamfering structure of a gasket stamping die, which is installed in the stamping die. The stamping die includes an upper die 1 and a lower die 2 arranged opposite to each other, and a plurality of reverse chamfering structures of the utility model are arranged between the upper die and the lower die. The reverse chamfering structure includes a hitting rod 3 and a punch return rod 4 embedded in parallel in the upper die, a transmission rod 5 and a chamfering punch 6 embedded in parallel in the lower die, and a conversion block 7 embedded in the lower die and contacting the lower end faces of the transmission rod and the chamfering punch respectively. The hitting rod and the transmission rod are arranged opposite to each other in the upper and lower directions, and the punch return rod and the chamfering punch are arranged opposite to each other in the upper and lower directions, and a return spring 8 is provided above the punch return rod.

[0019] The conversion block has a seesaw-like structure. When the upper die is pressed down, the hitting rod presses the transfer rod downward, and the chamfering punch rises synchronously to perform reverse chamfering on the gasket and squeeze the punch return rod. When the upper die is lifted, the return spring squeezes the punch return rod to move downward, pressing the chamfering punch downward, and the synchronous transfer rod rises and resets.

[0020] Specifically, the upper die includes an upper die base 11, an upper pad 12, an upper cover plate 13, an upper clamping plate 14 and a stripper plate 15 from top to bottom. One end of the hitting rod is embedded in the upper cover plate, and the other end passes through the upper clamping plate and extends out of the stripper plate. When the upper die is pressed down, the protruding end of the hitting rod can squeeze the transmission rod. The punch return rod is movably embedded in the inside of the stripper plate, and the upper end face is connected to the return spring embedded in the upper clamping plate. During stamping, the return spring is squeezed, and when the upper die is opened, the rebound force of the return spring effectively pushes the punch return rod downward.

[0021] The lower die comprises, from bottom to top, a lower die base 21, a lower pad 22 and a lower die plate 23. The conversion block is embedded in the lower die base. The transmission rod is movably embedded in the lower die plate and the lower pad, and the lower end face contacts the conversion block. The chamfering punch is movably embedded in the lower die plate, and contacts the conversion block in conjunction with the transmission rod 9 movably embedded in the lower pad.

[0022] The conversion block is a semicircular structure, and its middle position cooperates with the rotating shaft to be assembled in the lower mold. One end of the conversion block contacts the lower end of the transmission rod, and the other end contacts the lower end of the transmission rod. In this structure, the conversion block is similar to a seesaw structure. When one end is pressed down, the other end rises, which can effectively convert the downward pressing force of the upper mold into the upward extrusion force of the chamfering punch.

[0023] The chamfering punch in the structure of the utility model not only realizes the processing of the chamfer of the lower side of the gasket, but also realizes the positioning simultaneously. Figure 3 As shown, from one end to the other end are a limit block 61, a rod body 62 and a positioning rod 63. The outer diameter of the limit block is larger than the rod body, which can limit the rising position of the chamfering punch during the rise to avoid jamming. The outer diameter of the rod is larger than the positioning rod. At the same time, the outer diameter of the positioning rod is consistent with the inner hole of the gasket, and the connection between the positioning rod and the rod body is an arc chamfer 64. Before the chamfering punch is punched, its positioning rod is protruding from the outside of the lower die. As the upper die is pressed down, the positioning rod is first inserted into the center hole of the gasket to position the center position to avoid lateral displacement causing chamfer size errors.

[0024] The utility model discloses a reverse chamfering structure for a gasket stamping die, which utilizes a conversion block to convert an upward downward force into an upward downward force, thereby realizing reverse stamping chamfering and ensuring processing quality. In actual use, several groups of reverse chamfering structures can be arranged horizontally and vertically to realize synchronous processing of several gaskets, thereby further improving efficiency.

[0025] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gasket stamping die reverse chamfering structure, comprising an upper die and a lower die arranged opposite to each other, characterized in that: A plurality of reverse chamfering structures are provided between the upper die and the lower die, and the reverse chamfering structures include a driving rod and a punch return rod embedded in parallel in the upper die, a transmission rod and a chamfering punch embedded in parallel in the lower die, and a conversion block embedded in the lower die and contacting the lower end surfaces of the transmission rod and the chamfering punch respectively. When the transmission rod is pressed down by an external force, the conversion block drives the chamfering punch to rise. When the chamfering punch is pressed down, the conversion block drives the transmission rod to rise. The driving rod and the transmission rod are arranged opposite to each other in an upper and lower direction, and the punch return rod and the chamfering punch are arranged opposite to each other in an upper and lower direction, and a return spring is provided above the punch return rod. When the upper die is pressed down, the striking rod presses the transfer rod downward, the chamfering punch rises to chamfer the gasket in the opposite direction, and squeezes the punch return rod. When the upper die is lifted, the return spring squeezes the punch return rod downward, synchronously pressing the chamfering punch downward, and the transfer rod rises and resets synchronously.

2. The reverse chamfer structure of a gasket stamping die according to claim 1, characterized in that: The conversion block is a semicircular structure, the middle position of which cooperates with the rotating shaft to be assembled in the lower die, one end of which contacts the lower end of the transmission rod, and the other end of which contacts the lower end of the chamfering punch.

3. The reverse chamfer structure of a gasket stamping die according to claim 1, characterized in that: The chamfering punch is composed of a limit block, a rod body and a positioning rod from one end to the other. The outer diameter of the limit block is larger than the rod body, the outer diameter of the rod is larger than the positioning rod, the outer diameter of the positioning rod is consistent with the inner hole of the gasket, and the connection between the positioning rod and the rod body is an arc chamfer.

4. The reverse chamfer structure of a gasket stamping die according to claim 1, characterized in that: The upper die includes an upper die base, an upper pad, an upper cover plate, an upper clamping plate and a stripper plate from top to bottom. One end of the hitting rod is embedded in the upper cover plate, and the other end passes through the upper clamping plate and extends out of the stripper plate. The punch return rod is movably embedded in the stripper plate, and the upper end surface is connected to the return spring embedded in the upper clamping plate.

5. The reverse chamfer structure of the gasket stamping die according to claim 3, characterized in that: The lower die comprises, from bottom to top, a lower die base, a lower pad and a lower die plate; the conversion block is embedded in the lower die base; the transmission rod is movably embedded in the lower die plate and the lower pad, and the lower end face contacts the conversion block; the chamfering punch is movably embedded in the lower die plate, and contacts the conversion block in conjunction with the transmission rod movably embedded in the lower pad.

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