A water expansion forming process for cup lid

Abstract

The present invention discloses a water expansion forming process for a cup cover, and the water expansion forming process comprises the following steps: loading, placing a blank into a mold groove of a lower module, and the forming of the blank has a first water pressure value; water injection, a hydraulic drive device drives the upper module to move down from the first position to the second position, and a water injection system fills the inner cavity of the blank with water; the hydraulic drive device drives the blank to move down slowly to form a second water pressure value, and a booster cylinder adjusts the second water pressure value to a third water pressure value, and the upper module covers the lower module; forming, a water injection system and / or a booster cylinder inject water into the inner cavity of the blank, and when the water pressure of the inner cavity of the blank reaches the first water pressure value, the first water pressure value is maintained to a preset time; unloading, the water injection system and the booster cylinder release pressure, the hydraulic drive device drives the upper module to move up slowly to the second position, and the water injection system injects water to eject the formed blank from the mold groove of the lower module. The water expansion forming process has the advantages of fast expansion and low energy consumption, and effectively improves production efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of water expansion forming, and in particular relates to a water expansion forming process for a cup cover. Background Art

[0002] Stainless steel cups are common daily necessities, which mainly include cup bodies and cup lids; the production process of cup lids mainly includes stretching, closing, cutting and water expansion forming. Water expansion forming uses the incompressibility of water and high-pressure water to form the product in the mold; the water expansion forming process mainly includes loading, mold closing, water injection molding and unloading; when closing the mold, since the cup lid is filled with water, passive water pressure will be generated when pressing down, which makes the energy consumption required for mold closing higher. However, there is no water expansion forming process on the market that can adjust the passive water pressure. Therefore, there is an urgent need for a water expansion forming process that can adjust the passive water pressure to reduce energy consumption and improve production efficiency. Summary of the invention

[0003] The object of the present invention is to provide a water expansion forming process which can solve the above-mentioned problems.

[0004] To achieve the above-mentioned purpose, an embodiment of the present invention provides a water expansion forming process for a cup cover, which is applied to a cup cover forming machine. The cup cover forming machine includes an upper module, a lower module, a hydraulic drive device, a water injection system and a booster cylinder. The water expansion forming process includes the following steps:

[0005] 1) Loading, placing the blank into the groove of the lower module, wherein the blank is formed with a first water pressure value;

[0006] 2) Exhaust, the hydraulic drive device drives the upper module to move downward from the first position to a second position 1 to 2 mm closer to the upper end of the blank, and the water injection system injects water into the inner cavity of the blank until the inner cavity of the blank is filled with water;

[0007] 3) Pressure adjustment: the hydraulic drive device drives the blank to move downward slowly, the inner cavity of the blank forms a second water pressure value, the booster cylinder adjusts the second water pressure value to a third water pressure value, and the upper module covers the lower module;

[0008] 4) molding, the water injection system and / or the booster cylinder injects water into the inner cavity of the blank, and when the water pressure in the inner cavity of the blank reaches the first water pressure value, the first water pressure value is maintained for a preset time; and

[0009] 5) Unloading, the water injection system and the boost cylinder release pressure, the hydraulic drive device drives the upper module to slowly move up to the second position, the water injection system injects water into the inner cavity of the molded blank, so that the molded blank pops out from the groove of the lower module, and the hydraulic drive device drives the upper module to quickly move up to the first position.

[0010] Optionally, during exhaust, the hydraulic drive device drives the upper module to move down quickly from the first position to the third position, and then slowly move down to the second position.

[0011] Compared with the prior art, the beneficial effect of the present invention is that the water expansion forming process adjusts the second pressure value through the booster cylinder, that is, adjusts the passive water pressure, which greatly reduces the expansion time, reduces energy consumption, and effectively improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0013] Figure 1 It is a process flow chart of the present invention. DETAILED DESCRIPTION

[0014] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0015] In the description of the embodiments of the present invention, it should be understood that if there are directional indications in the embodiments of the present invention, such as up, down, left, right, front, back, inside, outside, etc., the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0016] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0017] In the embodiments of the present invention, unless otherwise clearly specified and limited, if there are terms such as "installed", "connected", "connected", "fixed", etc., they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0018] like Figure 1 As shown, an embodiment of the present invention provides a water expansion forming process for a cup cover, which is applied to a cup cover forming machine. The cup cover forming machine includes an upper module, a lower module, a hydraulic drive device, a water injection system and a booster cylinder.

[0019] It should be understood that the pressure value output by the boost cylinder ranges from 0 to 160 MPa; the output ends of the boost cylinder and the water injection system are both connected to the bottom wall of the groove of the lower module to achieve water injection; the water injection system is a combination of components such as a water pump, a water tank, a one-way valve, and a water channel on the lower module; the hydraulic drive device is a combination of components such as a 250-ton hydraulic cylinder and a guide structure.

[0020] The water expansion forming process comprises the following specific steps:

[0021] S100: Loading, placing the blank into the mold groove of the lower module, the molding of the blank has a first water pressure value, specifically, the first water pressure value varies according to different blanks, and needs to be obtained through testing before production. The blank is formed by stretching, closing, cutting and closing.

[0022] S200: Exhaust, the hydraulic drive device drives the upper module to move downward from the first position to a second position 1 to 2 mm closer to the upper end of the blank, and the water injection system injects water into the inner cavity of the blank until the inner cavity of the blank is filled with water.

[0023] Specifically, the first position refers to the initial position after the mold is fully opened. When the upper module is close to the second position, the water injection system starts to inject water into the inner cavity of the blank to prevent the water injection system from overturning the blank. The inner cavity of the blank is further filled with water to vent the inner cavity of the blank to prevent the air in the cavity from affecting the subsequent expansion.

[0024] It should be understood that there are two ways to exhaust the air in the blank: one is to control the water injection time; the other is to control the water pressure of the water injection system so that the water can quickly squeeze out the air to achieve the exhaust effect.

[0025] Preferably, during exhaust, the hydraulic drive device drives the upper module to move down quickly from the first position to the third position, and then slowly moves down to the second position, thereby avoiding crushing of the blank while ensuring the downward movement speed.

[0026] S300: Pressure adjustment. After the air in the inner cavity of the blank is exhausted, the hydraulic drive device drives the blank to move downward slowly, and the inner cavity of the blank will form a second water pressure value. The booster cylinder adjusts the second water pressure value to a third water pressure value, and the upper module covers the lower module.

[0027] Specifically, the second water pressure value is the passive pressure formed by the water on the inner cavity of the blank and the water on the groove of the lower module; the third water pressure value is the pressure suitable for the hydraulic drive device to drive the upper module to cover the lower module.

[0028] S400: molding, after the upper module is covered on the lower module, the water injection system and / or the booster cylinder further injects water into the inner cavity of the blank, and when the water pressure in the inner cavity of the blank reaches the first water pressure value, the first water pressure value is maintained for a preset time;

[0029] Specifically, the water injection system and the booster cylinder can simultaneously inject water into the inner cavity of the blank to form the first water pressure value for rapid molding; or the water injection system or the booster cylinder can independently inject water to form the inner cavity of the blank to form the first water pressure value; further, the first water pressure value is maintained for a preset time, which is 1 to 2 seconds, so that it is fully expanded to prevent the blank from rebounding after expansion.

[0030] S500: unloading. After maintaining the first pressure value for a certain period of time, the water injection system and the booster cylinder release pressure, and the hydraulic drive device drives the upper module to slowly move upward to the second position. The water injection system injects water into the inner cavity of the molded blank, so that the molded blank pops out from the groove of the lower module, and the hydraulic drive device drives the upper module to quickly move upward to the first position.

[0031] It should be understood that after the blank is expanded, it will stick tightly to the groove of the lower module, making it difficult for the operator to take it out, which is laborious and time-consuming. For this reason, the upper module is slowly moved up to the second position, and water is injected to pop the formed blank out of the groove of the lower module. This allows the formed blank to be quickly taken out, and the upper module in the second position can also prevent the formed blank from being rapidly ejected under force, thus avoiding safety hazards.

[0032] The expansion time required for expanding the cup cover using the water expansion forming process is 5 to 8 seconds, which effectively improves production efficiency, and the energy consumption can be reduced by adjusting the second pressure value by the booster cylinder.

[0033] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A water expansion forming process for a cup cover, applied to a cup cover forming machine, the cup cover forming machine comprising an upper module, a lower module, a hydraulic drive device, a water injection system and a booster cylinder, characterized in that: The water expansion forming process comprises the following steps: 1) Loading, placing the blank into the groove of the lower module, wherein the blank is formed with a first water pressure value; 2) Exhaust, the hydraulic drive device drives the upper module to move downward from the first position to a second position 1 to 2 mm closer to the upper end of the blank, and the water injection system injects water into the inner cavity of the blank until the inner cavity of the blank is filled with water; 3) Pressure adjustment: the hydraulic drive device drives the blank to move downward slowly, the inner cavity of the blank forms a second water pressure value, the booster cylinder adjusts the second water pressure value to a third water pressure value, and the upper module covers the lower module; 4) molding, the water injection system and / or the booster cylinder injects water into the inner cavity of the blank, and when the water pressure in the inner cavity of the blank reaches the first water pressure value, the first water pressure value is maintained for a preset time; and 5) Unloading, the water injection system and the boost cylinder release pressure, the hydraulic drive device drives the upper module to slowly move up to the second position, the water injection system injects water into the inner cavity of the molded blank, so that the molded blank pops out from the groove of the lower module, and the hydraulic drive device drives the upper module to quickly move up to the first position.

2. The water expansion forming process of a cup cover according to claim 1, characterized in that: During exhaust, the hydraulic drive device drives the upper module to move downward from the first position quickly to the third position, and then slowly to the second position.

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