Metal hollow body high-speed stretching forming device with bottom clamping function

Abstract

A metal hollow body high-speed stretching forming device with a bottom clamping function comprises a stamping mechanism, a stretching die assembly and a clamping mechanism which are sequentially arranged in the horizontal direction. A punching rod of the punching mechanism is arranged corresponding to one side of the metal hollow body to be stretched; an ejector rod of the clamping mechanism corresponds to the other side of the metal hollow body to be stretched; in the stretching process, the movement direction of the punching rod and the movement direction of the ejector rod are consistent with the movement direction of the metal hollow body, and meanwhile, the spring is pressed to enable the punching rod and the ejector rod to jointly drive the metal hollow body to conduct stretching action and achieve discharging; the punching rod is driven to move according to the rule of a first displacement curve, and the ejector rod is driven to move according to the rule of a second displacement curve; the two displacement curves are the same in shape, and the first displacement curve is prior to the second displacement curve by a phase difference, so that the displacement rule of the ejector rod lags behind the displacement rule of the punch rod. In the stretching forming process, the ejector rods are matched with the punching rods to clamp the two sides of the bottom of the tank bottom, the quality of products obtained after stretching forming can be guaranteed, and discharging from the discharging end is achieved.

Description

Technical Field

[0001] The utility model relates to metal hollow body stretching equipment, in particular to a metal hollow body high-speed stretching forming device with a bottom clamping function. Background Art

[0002] A metal hollow body is a metal cylindrical body with one end open, such as metal cans (such as cans) and power battery shells (such as square battery shells, cylindrical battery shells), etc. For example, the existing square battery shell production process uses a combination of a punch press and a progressive die, which is a vertical stretching method, and the speed generally does not exceed 40cpm.

[0003] The existing technology for producing power battery shells currently has the following shortcomings:

[0004] (1) The upper feeding and discharging method is adopted, that is, the feeding end and the discharging end are located on the same end face. After stretching and forming, it needs to pass through the stretching die in the stretching mechanism again. In this way, there is reverse stretching when the shell returns, which may cause the surface quality of the product to deteriorate. At the same time, it will also aggravate the wear of the stretching die, thereby reducing the life of the stretching die;

[0005] (2) The battery shell needs to be stretched by the impact of the punch rod in the punch press stretching and tightening mechanism, and the impact will cause instability in the stretching. In addition, this design requires a large amount of compression for the spring and a high requirement for the spring life, resulting in a long spring length and a large space occupation, which is not conducive to simplifying the equipment;

[0006] (3) With the rapid development of the new energy industry, production capacity is constantly expanding, and the number of punching machines needs to be greatly increased. This not only increases the investment cost, but also affects the consistency of the products as the number of stretching dies increases, especially square shell products. Since square shell dies are not interchangeable, there will be fixed differences in the products pulled out by each machine.

[0007] (4) The traditional stretching method is vertical, so only punch press stretching oil lubrication can be used, and the mold uses water circuit internal cooling. Due to the small flow rate of the stretching oil, small specific heat capacity and the inability of the mold internal cooling to directly cool the mold forming surface, the heat generated by the stretching forming cannot be taken away in time, resulting in the upper limit of production capacity due to heat generation.

[0008] Therefore, how to solve the above-mentioned deficiencies in the prior art has become a topic to be studied and solved in the present invention. Summary of the invention

[0009] The utility model aims to provide a high-speed stretching and forming device for a metal hollow body with a bottom clamping function.

[0010] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a high-speed stretching forming device for a metal hollow body with a bottom clamping function, comprising a stamping mechanism, a stretching die assembly and a clamping mechanism arranged in sequence along the horizontal direction;

[0011] The punching mechanism includes a punch rod, which is arranged on one side of the horizontal direction of the metal hollow body to be stretched;

[0012] The clamping mechanism includes a push rod, which is arranged corresponding to the other side of the metal hollow body to be stretched;

[0013] The punch rod and the ejector rod are driven to act together on the metal hollow body to be stretched, and drive the metal hollow body to move in the stretching die assembly to complete the stretching;

[0014] The clamping mechanism further comprises a spring, which acts on the push rod and keeps the push rod moving toward the metal hollow body;

[0015] During the stretching process, the movement directions of the punch rod and the push rod are consistent with the movement direction of the metal hollow body. At the same time, the spring is compressed, so that the punch rod and the push rod jointly drive the metal hollow body to stretch and realize the discharge;

[0016] The punch rod is driven to move according to the law of the first displacement curve, and the push rod is driven to move according to the law of the second displacement curve; the two displacement curves have the same shape, and the first displacement curve has a phase difference that precedes the second displacement curve, so that the displacement law of the push rod lags behind the displacement law of the punch rod.

[0017] According to a further technical solution, the stretching die assembly has a feed end and a discharge end. The metal hollow body to be stretched enters the stretching die assembly from the feed end and leaves the stretching die assembly from the discharge end after being stretched and formed.

[0018] A further technical solution is that during the movement of the punch rod, there is a first dead point position and a second dead point position, and the punch rod reciprocates between the first dead point position and the second dead point position; and the second dead point position corresponds to the position after the discharge end; during the movement of the push rod, there is a third dead point position and a fourth dead point position, and the push rod reciprocates between the third dead point position and the fourth dead point position; the fourth dead point position corresponds to the position after the second dead point position.

[0019] According to a further technical solution, the stamping mechanism also includes a first slider and a first guide rail; the first slider is connected to the punch rod and is driven to perform linear reciprocating motion along the first guide rail corresponding to the stretching die assembly; the clamping mechanism also includes a second slider assembly and a second guide rail, the second slider assembly is connected to the push rod and is driven to perform linear reciprocating motion along the second guide rail corresponding to the stretching die assembly.

[0020] According to a further technical solution, the stamping mechanism also includes a first linear drive unit for driving the punch rod to move, and the clamping mechanism also includes a second linear drive unit for driving the push rod to move; the first linear drive unit includes a first crankshaft and a first connecting rod that are rotatably connected, the first connecting rod is positioned and connected to the first slider, and drives the first slider to slide along the first guide rail under the rotation of the first crankshaft; the second linear drive unit includes a second crankshaft and a second connecting rod that are rotatably connected, the second connecting rod is positioned and connected to the second slider assembly, and drives the second slider assembly to slide along the second guide rail under the rotation of the second crankshaft.

[0021] A further technical solution is that the rotation direction and speed of the first crankshaft and the second crankshaft are consistent; the first crankshaft has a phase difference over the second crankshaft, and the phase difference ranges from 5° to 120°, with the position of the crank at the first dead point of the punch rod as the zero point, and gradually increases along the rotation direction.

[0022] A further technical solution is that the second slider assembly includes two slider parts and the spring connected between the two slider parts; wherein the first slider part is connected to the ejector rod, the second slider part is connected to the second connecting rod, and the spring acts between the two slider parts. During molding, the speeds of the two slider parts are different, the speed of the ejector slider on the connecting rod side follows the speed of the ejector crankshaft, the speed of the first slider part is the same as the speed of the second slider part before contacting the punch rod, and the speed of the first slider part is the same as the speed of the second slider part after contacting the punch rod, and the function of the spring is to balance the speed difference of the two slider parts by compression.

[0023] In a further technical solution, a stroke amplification mechanism is provided between the first crankshaft and the first slider, and between the second crankshaft and the second slider assembly. With this design, the stroke can be increased to meet higher requirements for product height. Specifically, the stroke amplification mechanism can be implemented by adding a rocker between the crankshaft and the slider.

[0024] The terms used herein are only for describing specific embodiments and are not intended to be limiting of the present invention. Singular forms such as "a", "this", "here", "this" and "the" as used herein also include plural forms.

[0025] The terms “first”, “second”, etc. used in this document do not specifically refer to an order or sequence, nor are they used to limit the present case. They are only used to distinguish components or operations described with the same technical terms.

[0026] As used herein, “connected” or “positioned” may refer to two or more components or devices being in direct physical contact with each other, or being in indirect physical contact with each other, or may refer to two or more components or devices operating or moving with each other.

[0027] The terms “include,” “including,” “have,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0028] The terms used in this document generally have the ordinary meaning of each term used in this field, in the context of the case and in the specific context, unless otherwise noted. Certain terms used to describe the present invention will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the present invention.

[0029] The working principle and advantages of this utility model are as follows:

[0030] 1. In the process of stretching and forming, the utility model can ensure the flatness of the bottom of the metal hollow body after stretching and forming by clamping the bottom of the metal hollow body with the help of the ejector rod and the punch rod, thereby improving the product quality.

[0031] 2. The stretching die assembly of the utility model has a feed end and a discharge end. The metal hollow body enters from the feed end and is discharged from the discharge end on the other side in the horizontal direction, which can avoid the adverse effects caused by feeding and discharging from the same end. For example, the metal hollow body after stretching needs to be discharged from the feed end in the return process, which may cause the metal hollow body to be stretched in the reverse direction, damage the surface quality of the product, and increase the wear of the stretching die in the stretching die assembly. Compared with the prior art, the utility model avoids reverse stretching and simplifies the structure of the stretching forming device, so that the consistency of the stretched product is better.

[0032] 3. After being compressed, the spring of the utility model can make the push rod maintain the movement trend toward the metal hollow body, so that the push rod and the punch rod cooperate to clamp the bottom of the metal hollow body. During the stretching process of the metal hollow body, when the spring is compressed, the push rod and the punch rod move together and have the same movement direction. Compared with the situation where the push rod is stationary, the compression amount of the spring can be reduced, thereby extending the service life of the spring; at the same time, the reduction in compression amount can also reduce the requirements for the length of the spring, thereby reducing the space occupied by the equipment.

[0033] 4. The utility model is a horizontal stretching method. The raw materials are fed from one side in the horizontal direction, and the products are discharged from the other side. This design can realize external cooling of the mold and the product, and significantly improve the heat dissipation effect. Compared with the oil lubrication and internal cooling of the mold in the prior art, the utility model can increase the upper limit of production capacity due to heat generation limitation, thereby realizing high-speed production. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Attached Figure 1 It is a mechanical diagram of an unstretched embodiment of the utility model;

[0035] Attached Figure 2 A mechanical diagram of the stretching process of an embodiment of the utility model;

[0036] Attached Figure 3 A mechanical diagram of the end of stretching of an embodiment of the utility model;

[0037] Attached Figure 4 It is the displacement curve of the punch rod and the ejector rod of the embodiment of the utility model.

[0038] In the above attached figure:

[0039] 0-metal hollow body to be stretched; 00-metal hollow body after stretching; 1-stretching die assembly; 2-punching mechanism; 3-clamping mechanism; 4-punch rod displacement curve; 5-rod displacement curve;

[0040] 11-feeding end; 12-discharging end;

[0041] 21-first linear drive unit; 22-first slider; 23-first guide rail; 24-punch rod;

[0042] 211 - first crankshaft; 212 - first connecting rod;

[0043] 31-second linear drive unit; 32-second slider assembly; 33-second guide rail; 34-thrust rod;

[0044] 311 - second crankshaft; 312 - second connecting rod;

[0045] 321a-first slider portion; 321b-second slider portion; 322-spring;

[0046] A-first dead point position; B-second dead point position; C-third dead point position; D-fourth dead point position. DETAILED DESCRIPTION

[0047] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0048] Embodiment: The present invention will be clearly described below with diagrams and detailed descriptions. After understanding the embodiments of the present invention, any person skilled in the art can make changes and modifications based on the techniques taught by the present invention without departing from the spirit and scope of the present invention.

[0049] See attached Figures 1 to 3 As shown, this embodiment provides a high-speed stretching and forming device for a metal hollow body with a bottom clamping function, comprising a stretching die assembly 1, a punching mechanism 2 and a clamping mechanism 3, wherein the stretching die assembly 1 is used to stretch and form a metal hollow body 0 to be stretched located inside the stretching die assembly, the punching mechanism 2 comprises a punch rod 24, the punch rod 24 is arranged at one side corresponding to the bottom of the metal hollow body 0, and is used to push the metal hollow body 0 to be stretched into the stretching die assembly 1, the clamping mechanism 3 comprises a push rod 34, one end of the push rod 34 is arranged at the other side of the bottom of the metal hollow body 0, and is used to cooperate with the punch rod 24 to clamp the bottom of the metal hollow body when the metal hollow body 0 to be stretched is stretched, and the metal hollow body is moved in the stretching die assembly 1 to complete the stretching, so as to ensure the flatness of the bottom of the metal hollow body after stretching.

[0050] It can be understood that the above-mentioned metal hollow body is a generalized concept, which means that the metal hollow body will go through three stages from the time of not being stretched to the time of stretching completion, namely, the metal hollow body 0 to be stretched, the metal hollow body being stretched, and the metal hollow body 00 formed by stretching after the stretching is completed.

[0051] The above-mentioned stretching die assembly 1 is preferably a horizontal stretching die assembly 1, and a vertical stretching die assembly 1 can also be used. The punch rod 24 of the horizontal stretching machine realizes the stretching action in the horizontal direction, and the punch rod 24 of the vertical stretching machine realizes the stretching action in the vertical direction. Figure 1 The stretching die assembly 1 in this embodiment is horizontal, and the stretching mechanism 1 has a feed end 11 and a discharge end 12. The feed end 11 and the discharge end 12 are arranged so that the metal hollow body 0 to be stretched enters from the feed end 11 and is discharged from the discharge end 12, which can avoid the adverse effects caused by feeding and discharging at the same end, such as the reverse stretching that the metal hollow body may suffer in the return stroke, which makes the surface quality of the product deteriorate, and may also cause damage to the stretching die inside the stretching die assembly 1, resulting in a reduction in the service life of the stretching die.

[0052] In this embodiment, the metal hollow body 0 to be stretched enters the stretching die assembly 1 in a horizontal position, that is, the metal hollow body 0 has an opening, and the opening is horizontally oriented. Specifically, the horizontal orientation is determined by the placement position of the stretching die in the stretching die assembly 1, such as Figures 1 to 3As shown, the opening of the metal hollow body 0 to be stretched is horizontally facing left; in this way, when cooling the stretching die assembly 1, the stretching die assembly 1 can be flushed with a coolant (such as an emulsion) without worrying about the emulsion entering the metal hollow body along the above opening and affecting the stretching forming effect of the metal hollow body. If a vertical stretching die assembly 1 is used to stretch the can body, the opening of the metal hollow body is facing upward. When the emulsion is flushed on the stretching die assembly 1 to achieve the cooling effect, it is difficult to avoid the emulsion from entering the can body, which will affect the stretching forming effect of the can body. In this way, the stretching die assembly 1 can only be cooled by an internal cooling method with a secondary cooling effect, and the production capacity cannot be increased, because a higher production capacity means a higher heat generation, but internal cooling cannot solve the heat dissipation problem of high heat generation. In addition, the internal cooling method also affects the production quality to a certain extent.

[0053] In this embodiment, the stretching die assembly 1 refers to a mechanical device or hydraulic device that can realize the stretching process. The stretching die assembly 1 is a stretching process equipment well known to those skilled in the art, and a suitable stretching die assembly 1 can be selected according to the specific situation. This embodiment will not go into details.

[0054] During the stretching process, the movement directions of the punch rod 24 and the push rod 34 are consistent with the movement direction of the metal hollow body, and the punch rod 24 can catch up with the push rod 34 to jointly act on the bottom of the metal hollow body.

[0055] Considering the effect of the punch 24 and the push rod 34 clamping the bottom of the metal hollow body, preferably, the clamping mechanism also includes a spring 322, which acts on the push rod and keeps the push rod 34 moving toward the metal hollow body. Therefore, during the stretching process, when the punch 24 catches up with the push rod 34, the spring 322 is compressed after being pressed. After a period of time, the spring 322 maintains the compression amount after being pressed. At this time, the punch 24 and the push rod 34 move at the same speed and drive the metal hollow body together, which can ensure that the punch 24 and the push rod 34 are always in a reliable clamping state, thereby ensuring the stable clamping of the bottom of the metal hollow body 0 to be stretched.

[0056] On the other hand, when the spring 322 is compressed, the push rod 34 and the punch rod 24 move synchronously and in the same direction. Compared with the case where the push rod 34 is stationary, the compression amount of the spring 322 can be reduced, which not only reduces the time to achieve the clamping function and improves the production rate, but also can further extend the service life of the spring 322.

[0057] Then, after the stretching process is completed, the spring 322 begins to rebound, and the first slider portion 321a gradually moves at the same speed as the second slider portion 321b. After the punch rod 24 and the push rod 34 are completely separated, they reach the same speed, so that the push rod 34 can be separated from the punch rod 24 and the metal hollow body, so that when the punch rod 24 drives the metal hollow body to move to the discharge end 12 of the stretching die assembly 1, a removal space is reserved for removing the metal hollow body.

[0058] The stamping mechanism 2 also includes a first linear drive unit 21, and the punch rod 24 is driven by the first linear drive unit 21 to perform horizontal reciprocating motion at the bottom of one side of the corresponding metal hollow body 0 to be stretched, and drives the metal hollow body 0 to be stretched to move into the stretching die assembly 1 for stretching; the clamping mechanism 3 also includes a second linear drive unit 31, and the push rod 34 is driven by the second linear drive unit 31 to perform horizontal reciprocating motion at the bottom of the other side of the corresponding metal hollow body 0 to be stretched, and works together with the punch rod 24 to clamp the bottom of the metal hollow body 0 to be stretched.

[0059] The stamping mechanism 2 also includes a first slider 22 and a first guide rail 23 arranged in a horizontal direction. The first slider 22 is connected to the punch rod 24 and slides horizontally back and forth along the first guide rail 23 corresponding to the feed end 11; the clamping mechanism 3 also includes a second slider assembly 32 and a second guide rail 33 arranged in a horizontal direction. The second slider assembly 32 is connected to the push rod 34 and slides horizontally back and forth along the second guide rail 33 corresponding to the discharge end 12.

[0060] like Figure 1 As shown, in an unstretched state, the metal hollow body 0 to be stretched is placed on the feed end 11 of the stretching die assembly 1 , and one end of the ejector rod 34 is arranged corresponding to the feed end 11 .

[0061] like Figure 2 As shown, the punch rod 24 is driven by the first linear drive unit 21 to slide back and forth horizontally. During the movement, the punch rod 24 moves toward the metal hollow body 0 to be stretched until it contacts the inner bottom of the metal hollow body with stretching. Then the punch rod 24 continues to move and drives the metal hollow body 0 to be stretched to move into the stretching die assembly 1. Since the movement speed of the punch rod 24 during the stretching process is greater than the movement speed of the push rod 34, the punch rod 24 can contact the push rod 34, so that the punch rod 24 and the push rod 34 act together on the inner bottom and outer bottom of the metal hollow body. At this time, the push rod 34 is subjected to the pressure of the punch rod 24, and the spring 322 in the second slider assembly 32 is compressed, so that the punch rod 24 maintains a movement trend toward the metal hollow body 0 to be stretched, and then cooperates with the punch rod 24 to clamp the bottom of the metal hollow body 0 to be stretched. After the compression amount of the spring 322 remains stable, the punch rod 24 and the push rod 34 jointly drive the metal hollow body to move, and the stretching die inside the stretching die assembly 1 stretches the metal hollow body with stretching.

[0062] like Figure 3 As shown, as the punch rod 24 continues to move, the metal hollow body 0 to be stretched is stretched, and during the stretching process, the bottom of the metal hollow body is continuously clamped to ensure the forming quality of the metal hollow body; the stretched metal hollow body continues to move to the outside of the stretching die assembly 1, that is, the discharge end 12, along with the punch rod 24. At this time, the movement speed of the push rod 34 is greater than the movement speed of the punch rod 24, and it continues to move in the direction away from the metal hollow body and detaches from the bottom of the metal hollow body through the drive of the second linear drive unit 31, forming a space for grasping, and then the stretched metal hollow body 0 is removed by a grasping mechanism (such as a manipulator), and the punch rod 24 then moves back to wait for the next metal hollow body 0 to be stretched to be driven into the stretching die assembly 1, and the push rod 34 also moves back after moving for a period of time to wait for the next metal hollow body 0 to be stretched.

[0063] Combination Figure 4 As shown, Figure 4 It is a schematic diagram of the displacement curve 4 of the punch rod 24 and the displacement curve 5 of the ejector rod 34, the ordinate represents the angle, the abscissa represents the displacement, and X represents the feed surface, the bottom position of the metal hollow body. During the movement of the punch rod 24, there is a first dead point position A and a second dead point position B, and the punch rod 24 reciprocates between the first dead point position A and the second dead point position B. During the movement of the ejector rod 34, there is a third dead point position C and a fourth dead point position D, and the ejector rod 34 reciprocates between the third dead point position C and the fourth dead point position D. Point E is the contact point between the punch rod 24 and the ejector rod 34, and point F is the separation point between the punch rod 24 and the ejector rod 34.

[0064] It can be understood that the dead point position is a position where the movement direction of the punch rod 24 or the ejector rod 34 changes, or is a return position.

[0065] Another thing that can be understood is that the movement direction of the punch rod 24 from the first dead point position A to the second dead point position B is the same as the movement direction of the push rod 34 from the third dead point position C to the fourth dead point position D, and among the punch rod 24 and the push rod 34 that move in this movement direction, the push rod 34 is located at the front end of the punch rod 24.

[0066] Among them, the second dead point position B of the punch rod 24 corresponds to the position after the discharge end 12, so as to drive the metal hollow body to complete the entire stretching process in the stretching die assembly; the third dead point position C corresponds to the position of the feed end 11, and it is necessary to ensure that when the punch rod 24 catches up with the push rod 34, the metal hollow body is in a state that has not yet been stretched or the starting state of stretching; the fourth dead point position D corresponds to after the second dead point position B, so that after the stretching of the metal hollow body is completed, the push rod 34 breaks away from the punch rod 24 and continues to move, forming a space for grasping, and removing the stretched and formed metal hollow body 00.

[0067] From the above description of the movement process of the punch rod 24 and the ejector rod 34, it can be seen that when a metal hollow body is stretched, the punch rod 24 and the ejector rod 34 have the above movement law. In order to facilitate the stretching die assembly of this embodiment to stretch multiple metal hollow bodies, it is necessary to ensure that the punch rod 24 and the ejector rod 34 always maintain the movement law. In a preferred embodiment, the punch rod 24 is driven to move according to the law of the first displacement curve, and the ejector rod 34 is driven to move according to the law of the second displacement curve. The two displacement curves have the same shape, and the first displacement curve has a phase difference that precedes the second displacement curve, so that the punch rod 24 catches up with the ejector rod 34, and when the punch rod 24 reaches the second dead point position B, the ejector rod 34 continues to move until it reaches the fourth dead point position D, providing discharge time for the metal hollow body to be discharged at the discharge end 12.

[0068] In this embodiment, the first linear drive unit 21 includes a first crankshaft 211 and a first connecting rod 212 that are rotatably connected. The first connecting rod 212 is positioned and connected to the first slider 22, and the first slider 22 slides along the first guide rail 23 under the rotation of the first crankshaft 211; the second linear drive unit 31 includes a second crankshaft 311 and a second connecting rod 312 that are rotatably connected. The second connecting rod 312 is positioned and connected to the second slider assembly 32, and the second slider assembly 32 slides along the second guide rail 33 under the rotation of the second crankshaft 311.

[0069] It is worth mentioning that the first linear drive unit 21 and the second linear drive unit 31 may also be other drive mechanisms for driving an object to perform linear motion, for example, a linear motor.

[0070] Furthermore, the rotation direction and speed of the first crankshaft 211 and the second crankshaft 311 are consistent, and the first crankshaft 211 has a phase difference over the second crankshaft 311, and the phase difference ranges from 5° to 120°, with the position of the first dead point of the punch rod being the zero point, and gradually increases along the rotation direction. In this way, by utilizing the phase difference, the movement speed of the punch rod 24 can be set greater than the movement speed of the push rod 34. After catching up with the push rod 34, they jointly drive the metal hollow body to move until the stretching process is completed, thereby ensuring the quality of the product after stretching and forming, and at the same time facilitating the realization of "bottom discharging" from the discharging end.

[0071] After the stretching is completed, the movement speed of the punch rod 24 can be set to be lower than the movement speed of the push rod 34, so that the push rod 34 separates from the metal hollow body and the punch rod 24. When the punch rod 24 drives the metal hollow body to move to the second dead point position B, there is a space between the punch rod 24 and the push rod 34, which can be used for the horizontal discharge of the metal hollow body 00 after stretching, that is, the stretching of a metal hollow body is completed.

[0072] The second slider assembly 32 includes two slider parts and the spring 322 connected between the two slider parts. The first slider part 321a is connected to the push rod 34, the second slider part 321b is connected to the second connecting rod 312, and the spring 322 acts between the two slider parts 321.

[0073] During forming, the speeds of the two slider parts are different. The speed of the push rod slider on the connecting rod side follows the rotation speed of the push rod crankshaft. The speed of the first slider part 321a is the same as the speed of the second slider part 321b before contacting the punch rod 24. After contacting the punch rod 24, it is the same as the speed of the punch rod 24. The function of the spring 322 is to balance the speed difference of the two slider parts through compression, and at the same time provide clamping force to ensure the flatness of the bottom.

[0074] The working process of the utility model is described as follows:

[0075] Place the metal hollow body 0 to be stretched at the feed end 11 of the stretching die assembly 1;

[0076] The first crankshaft 211 rotates and drives the first connecting rod 212 to rotate. The first connecting rod 212 pushes the first slider 22 to move linearly along the first guide rail 23, thereby pushing the punch 24 to move linearly until it contacts the inner bottom of the metal hollow body and drives the metal hollow body into the stretching die assembly 1, ready to start stretching;

[0077] The push rod 34 is arranged corresponding to the discharge end 12, the second crankshaft 311 rotates and drives the second connecting rod 312 to rotate, and the second connecting rod 312 pushes the second slider assembly 32 to make a linear motion along the second guide rail 33, thereby pushing the push rod 34 to cooperate with the punch rod 24 to clamp the bottom of the metal hollow body on both sides, and at the same time, stretch it toward the discharge end 12;

[0078] After the metal hollow body is stretch-formed, the punch 24 and the push rod 34 jointly drive the metal hollow body to move to the outside of the discharge end 12, and then the push rod 34 separates from the bottom of the metal hollow body; the punch 24 continues to move to the first dead point position A, turns back and moves back to drive the next metal hollow body 0 to be stretched into the stretching die assembly 1, and after the metal hollow body 00 that has been stretch-formed is removed, the push rod 34 moves to the second dead point position B, and moves in the direction close to the stretching die assembly 1 to wait for the next metal hollow body 0 to be stretched, thereby completing the stretching forming process of a metal hollow body.

[0079] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A high-speed stretching and forming device for a metal hollow body with a bottom clamping function, characterized in that: It comprises a stamping mechanism (2), a stretching die assembly (1) and a clamping mechanism (3) which are arranged in sequence along a horizontal direction; The punching mechanism (2) comprises a punch rod (24), the punch rod (24) being arranged on one side in the horizontal direction corresponding to the metal hollow body to be stretched; The clamping mechanism (3) comprises a push rod (34), the push rod (34) being arranged corresponding to the other side of the metal hollow body to be stretched; The punch rod (24) and the push rod (34) are driven to act together on the metal hollow body to be stretched, and drive the metal hollow body to move in the stretching die assembly (1) to complete the stretching; The clamping mechanism (3) further comprises a spring (322), wherein the spring (322) acts on the push rod (34) and enables the push rod (34) to maintain a movement trend toward the metal hollow body; During the stretching process, the movement directions of the punch rod (24) and the push rod (34) are consistent with the movement direction of the metal hollow body (0), and at the same time, the spring (322) is compressed, so that the punch rod (24) and the push rod (34) jointly drive the metal hollow body to perform a stretching action and realize material discharge; The punch rod (24) is driven to move according to the law of a first displacement curve, and the push rod (34) is driven to move according to the law of a second displacement curve; the two displacement curves have the same shape, and the first displacement curve has a phase difference prior to the second displacement curve, so that the displacement law of the push rod (34) lags behind the displacement law of the punch rod (24).

2. The high-speed stretching and forming device for a metal hollow body with a bottom clamping function as claimed in claim 1, characterized in that: The stretching die assembly (1) comprises a feed end (11) and a discharge end (12); the metal hollow body (0) to be stretched enters the stretching die assembly (1) from the feed end (11) and leaves the stretching die assembly (1) from the discharge end (12) after being stretched and formed.

3. The high-speed stretching and forming device for a metal hollow body with a bottom clamping function as claimed in claim 2, characterized in that: During the movement of the punch rod (24), there is a first dead point position and a second dead point position, and the punch rod (24) reciprocates between the first dead point position and the second dead point position; and the second dead point position corresponds to the position behind the discharge end (12); During the movement of the push rod (34), there is a third dead point position and a fourth dead point position, and the push rod (34) reciprocates between the third dead point position and the fourth dead point position; The fourth dead point position corresponds to after the second dead point position.

4. The high-speed stretching and forming device for a metal hollow body with a bottom clamping function as claimed in claim 1, characterized in that: The punching mechanism (2) further comprises a first slider (22) and a first guide rail (23); the first slider (22) is connected to the punch rod (24) and is driven to perform linear reciprocating motion along the first guide rail (23) corresponding to the stretching die assembly (1); The clamping mechanism (3) further comprises a second slider assembly (32) and a second guide rail (33); the second slider assembly (32) is connected to the ejector rod (34) and performs linear reciprocating motion along the second guide rail (33) corresponding to the stretching die assembly (1).

5. The high-speed stretching and forming device for a metal hollow body with a bottom clamping function as claimed in claim 4, characterized in that: The punching mechanism (2) further comprises a first linear driving portion (21) for driving the punch rod (24) to move, and the clamping mechanism (3) further comprises a second linear driving portion (31) for driving the ejector rod (34) to move; The first linear drive unit (21) comprises a first crankshaft (211) and a first connecting rod (212) which are rotatably connected, the first connecting rod (212) being positionally connected to the first sliding block (22) and driving the first sliding block (22) to slide along the first guide rail (23) under the rotation of the first crankshaft (211); The second linear drive unit (31) comprises a second crankshaft (311) and a second connecting rod (312) which are rotatably connected. The second connecting rod (312) is positionally connected to the second slider assembly (32) and drives the second slider assembly (32) to slide along the second guide rail (33) when the second crankshaft (311) rotates.

6. The high-speed stretching and forming device for a metal hollow body with a bottom clamping function as claimed in claim 5, characterized in that: The first crankshaft (211) and the second crankshaft (311) have the same rotation direction and rotation speed; the first crankshaft (211) has a phase difference with respect to the second crankshaft (311), and the phase difference ranges from 5° to 120°.

7. The high-speed stretching and forming device for a metal hollow body with a bottom clamping function as claimed in claim 5, characterized in that: The second slider assembly (32) comprises two slider parts and the spring (322) connected between the two slider parts (321); The first slider portion (321a) is connected to the push rod (34), the second slider portion (321b) is connected to the second connecting rod (312), and the spring (322) acts between the two slider portions (321).

8. The high-speed stretching and forming device for a metal hollow body with a bottom clamping function as claimed in claim 5, characterized in that: A stroke amplification mechanism is provided between the first crankshaft (211) and the first slider (22), and between the second crankshaft (311) and the second slider assembly (32).

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