Adjustable buffer device for crown capping double action press

Abstract

The utility model discloses a kind of adjustable buffer device for crown bottle cap double-action punch press, it is related to stamping die technical field. Including being located in the upper die plate upper assembly, being located in the middle die plate middle assembly and being located in the lower die plate lower assembly;Upper assembly includes the upper punch block supported by disc spring, middle assembly includes the T-shaped middle punch block limited by pedestal and shaft sleeve, lower assembly includes the lower punch rod of adjustable height by adjusting locking nut. When die, lower punch rod lifts middle punch block, so that clearance Δ is formed between it and pedestal, upper punch block down and middle punch block abut and compress disc spring to realize buffer limit. By adjusting the height of lower punch rod, the width of clearance Δ is changed, and fine adjustment to lower dead point position is realized.The device can maintain 0.05mm repeat position accuracy for a long time and effectively improve production pass rate, with the characteristics of high structure matching, easy to adjust, long service life.

Description

Technical Field

[0001] This utility model relates to the field of stamping die technology, specifically an adjustable buffer device for a double-action punch press for crown-shaped bottle caps. Background Technology

[0002] The crown-shaped bottle cap is a classic design in the beverage packaging industry. It features evenly spaced serrations (skirt) along its edges and a sealing gasket inside the cap. During sealing, a special sealing claw presses against the bottle opening. Under pressure, the sealing gasket adheres tightly to the bottle opening, achieving a seal. The dimensions of the crown-shaped bottle cap significantly impact its sealing performance, particularly the skirt angle β and the cap height H. In production inspection standards, the tolerance range for the skirt angle β is ±5°, and the tolerance range for the cap height H is ±0.15mm. The key factor affecting these dimensions is the repeatability accuracy of the upper die plate at the bottom dead center.

[0003] Currently, crown-shaped bottle cap punching machines generally use three-plate stamping dies for production (such as...). Figure 2 As shown): The middle template is fixed on the punch press frame; the upper template is fixed to the bottom of the upper slide and is driven to slide up and down by a crankshaft connecting rod structure; the lower template is fixed to the top of the lower slide and is driven to slide up and down by the main spindle cam. The stamping action is completed through the coordinated movement of the upper, middle, and lower templates.

[0004] Chinese patent CN2690075Y discloses a precision micro-adjustment combination mold, but it is mainly applicable to single-action stamping dies with a two-platen structure and cannot be directly applied to a three-platen double-action stamping press structure. Furthermore, this prior art uses a rigid hard contact method between upper and lower buffer blocks, adjusting the stroke through a wedge structure driving the rod. This rigid hard contact is prone to wear under long-term high-frequency stamping, leading to rapid decline in precision. Moreover, wear on the wedge mechanism results in limited adjustment range and increased maintenance costs.

[0005] Therefore, there is an urgent need for a buffer device that can make precise fine adjustments to the structure of a three-template double-action punch press and can ensure long-term high-precision repeatability of the position. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of existing technologies for double-action punch presses, especially three-plate stamping dies used in the production of crown-shaped bottle caps, in terms of precision adjustment and buffer protection. It provides an adjustable buffer device for double-action punch presses for crown-shaped bottle caps, so as to achieve simple and quick fine adjustment while ensuring long-term continuous production precision.

[0007] To achieve the above objectives, this application provides the following technical solution: An adjustable buffer device for a crown-shaped bottle cap double-action punch press, applied to a three-plate double-action punch press with a fixed middle platen and relative sliding upper and lower platens, comprising: The upper component is disposed on the upper template of the punch press and includes a cover, an upper impact block and an elastic element. The upper impact block is slidably disposed inside the upper template. The cover is fixed to the top of the upper template and presses against the elastic element. The elastic element abuts against the upper part of the upper impact block. The middle component is disposed on the middle template of the punch press and includes a base, a bushing, a middle impact block and an anti-detachment limiting member. The base is fixed on the middle template, the bushing is installed in the base, the middle impact block is slidably disposed in the bushing along the axial direction, and the lower part of the middle impact block is provided with an annular groove. The anti-detachment limiting member passes through the bushing and extends into the annular groove to limit the sliding stroke of the middle impact block. The lower component is disposed on the lower template of the punch press and includes a lower punch rod and an adjusting locking nut. The lower punch rod is slidably inserted into the lower template, and the adjusting locking nut is sleeved on the outside of the lower punch rod and presses against the upper surface of the lower template. The top end of the lower punch passes through the middle template and abuts against the bottom end of the middle impact block; in the mold-closed state, the lower punch lifts the middle impact block, creating a gap between the top end of the middle impact block and the base, and the upper impact block moves downward with the upper template and abuts against the top end of the middle impact block; by adjusting the adjusting locking nut, the extension height of the lower punch is changed, thereby changing the width of the gap, and fine adjustment of the bottom dead center position of the upper template is achieved.

[0008] Furthermore, the elastic element is a disc spring assembly, which is composed of several disc springs stacked or arranged in pairs.

[0009] Furthermore, the anti-detachment limiting component is a set screw, the front end of which passes through the side wall through hole of the bushing and is engaged in the annular groove of the middle impact block.

[0010] Furthermore, the top end of the lower punch passes through the through hole provided on the middle template and abuts against the bottom end of the middle impact block, and there is a straight sliding clearance space between the lower punch and the middle impact block.

[0011] Furthermore, an anti-rotation fitting structure is provided between the bottom of the lower punch and the mounting hole of the lower template, the anti-rotation fitting structure being used to restrict the lower punch from rotating circumferentially relative to the lower template.

[0012] Furthermore, the bottom end of the punch rod is provided with a hexagonal force-bearing surface for external tool drive.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. High structural compatibility: This utility model addresses the linkage feature of the upper and lower templates of a three-template double-action punch press by organically dividing the adjustment structure into three components: upper, middle, and lower, which are installed on the corresponding templates respectively. This perfectly adapts to the stamping layout of the three-template process for crown-shaped bottle caps and solves the pain point that existing technologies cannot be directly applied to three-template punch presses.

[0014] 2. Employing elastic non-rigid contact, balancing precision and lifespan: Unlike the existing "rigid hard contact" method, this invention uses a disc spring assembly between the upper impact block and the cover. During mold closing, the elastic deformation of the disc spring absorbs the enormous impact force during stamping. This non-rigid contact greatly protects the mold parts, enabling them to maintain a stable bottom dead center repeatability of 0.05mm even under long-term continuous high-speed operation, far exceeding the traditional rigid wear structure.

[0015] 3. Convenient adjustment and low maintenance cost: It abandons the complex wedge transmission mechanism and only relies on threaded connection. The linear height of the lower punch can be adjusted by loosening the locking nut. A single adjustment only takes 0.5 to 1 hour, and after adjustment, it can be locked to maintain the state for a long time, which greatly reduces the downtime of equipment maintenance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the external structure of a crown-shaped bottle cap; Figure 2 A schematic diagram of the three-template structure of a crown-shaped bottle cap stamping die; Figure 3 This is a cross-sectional view of the components on the adjustable buffer device of this application; Figure 4 This is a structural cross-sectional view of the components in the adjustable buffer device of this application; Figure 5 This is a structural cross-sectional view of the lower component of the adjustable buffer device of this application; Figure 6 This is a schematic diagram of the overall assembly of the adjustable buffer device of this application, wherein part (a) is in the mold-open state and part (b) is in the mold-closed state; Figure 7 for Figure 6 Enlarged view of a partial structure of the central section (I).

[0017] The reference numerals in the attached figures are explained as follows: 1-Upper template, 2-Cover, 3-Upper impact block, 4-Elastic component, 5-Middle template, 6-Anti-detachment limiting component, 7-Middle impact block, 8-Sleeve, 9-Base, 10-Lower template, 11-Nut, 12-Lower punch rod. Detailed Implementation

[0018] The technical solution of this application will be further described in detail below with reference to the accompanying drawings.

[0019] I. Application Scenarios and Mold Structure like Figure 1 and Figure 2 As shown, Φd is the outer diameter of the crown-shaped bottle cap. The key dimensions of the bottle cap are greatly affected by the skirt angle β and the cap height H. The most critical process affecting these dimensions is the positioning accuracy of the upper template 1 at the bottom dead center. The punch press adopts a three-template structure. The middle template 5 is fixed on the frame (shaded area), the upper template 1 is driven downward by the upper slide, and the lower template 10 is driven upward by the spindle cam. The three complete the stamping action at the moment of mold closing. The buffer device of this utility model is specifically designed for this specific high-speed, reciprocating, multi-template linkage process.

[0020] II. Detailed Description of Overall Structure refer to Figures 3 to 6 The adjustable buffer device of this utility model consists of three parts: an upper component, a middle component, and a lower component.

[0021] (1) Upper component (reference) Figure 3 ) The upper component is housed within the stepped hole of the upper template 1. The core component is the upper impact block 3, which has a large disc in the center and cylindrical protrusions at the top and bottom. An elastic element 4 is provided on the upper inner side of the upper impact block 3. Preferably, the elastic element 4 is a disc spring assembly, composed of multiple disc springs stacked or joined together. The cover 2 is fixed to the upper template 1 with screws, and the inner surface of the cover 2 presses down against the disc spring assembly. When the lower end face of the upper impact block 3 is impacted by the middle impact block 7, the upper impact block 3 can slide upward, compressing the disc spring assembly; after the impact force disappears, the elasticity of the disc spring assembly causes the upper impact block 3 to return to its original position downward.

[0022] (2) Components (Reference) Figure 4 ) The central component is fixed to the central template 5. The base 9 is installed on the upper surface of the central template 5 with screws. A circular bushing 8 is embedded in the base 9, and a central impact block 7 is slidably installed inside the bushing 8. The longitudinal section of the central impact block 7 along the center line is "T"-shaped, with a large disc structure at the upper end and a thinner cylindrical structure at the lower end. A groove is provided circumferentially in the lower cylindrical section. The anti-detachment limiting member 6 (here a set screw) fixed in the base 9 passes through the side wall through hole of the bushing 8 and extends into the groove of the central impact block 7, which plays an axial limiting role and prevents the central impact block 7 from completely separating from the base 9 when sliding up and down in the bushing 8. A through hole is opened in the central template 5 at the position corresponding to the center hole inside the bushing 8 for the lower punch 12 to pass through. Under normal conditions, the bottom of the large disc of the central impact block 7 is attached to the upper end surface of the base 9 due to its own weight.

[0023] The middle template 5 has a through hole for the lower punch 12 to pass through, leaving a clearance space for linear sliding between the lower punch 12 and the middle impact block 7. This clearance space can prevent the lower punch 12 from rigidly interfering with the middle impact block 7 during the up and down sliding process, ensuring that the two always fit smoothly and guaranteeing the reliability and repeatability of the buffer action.

[0024] (3) Lower component (refer to) Figure 5 ) The lower component slides together with the lower template 10, mainly used for driving and adjustment. The lower punch 12 is cylindrical and passes through the hole in the lower template 10. The upper part of the lower punch 12 is provided with an adjusting locking nut 11, and the bottom is fixed to the lower template 10 by a locking screw. In this embodiment, an anti-rotation fit structure is provided between the bottom of the lower punch 12 and the mounting hole of the lower template 10. The lower part of the lower punch 12 is machined into a flat square (D-shaped cross-section), and the hole of the lower template 10 is machined into a matching D-shaped hole. As another embodiment, a flat key and keyway fit can also be used. At the same time, the bottom end of the lower punch 12 is also provided with a hexagonal force-bearing surface for external tools (such as wrenches) to drive.

[0025] III. Principles of Movement and Adjustment Methods (Reference) Figure 6 , Figure 7 ) like Figure 6 As shown, in the mold-open state, the upper mold plate 1 is in a high position, and the lower mold plate 10 is not lifted.

[0026] In the mold closed state: When the punch press spindle rotates and the lower die plate 10 reaches its highest point, the top of the lower punch rod 12 passes through the through hole of the middle die plate 5 and pushes the middle impact block 7 upward. The middle impact block 7 slides upward, causing its top large disc to disengage from the upper surface of the base 9, forming a small gap Δ (e.g., ...). Figure 7 (See enlarged view).

[0027] Subsequently, the upper template 1 descends to its lowest point, and the lower end face of the upper impact block 3 presses against the upper surface of the middle impact block 7. At this time, the upper impact block 3 is supported by the middle impact block 7 and the lower punch rod 12. If the upper template 1 continues to descend, it will only press the cover 2 downward to compress the disc spring assembly. The huge elastic force of the disc spring assembly will prevent the upper template 1 from continuing to descend, forming a non-rigid limit and buffer.

[0028] IV. Fine-tuning of the bottom dead center position When product inspection reveals that the skirt angle β or cap height H of the crown cap is out of tolerance, the buffer device can be adjusted. Loosen the adjusting locking nut 11 and the fastening screw at the bottom of the lower punch rod, move the lower punch rod 12 up or down to the appropriate height, and then tighten it again.

[0029] When it is found that the cover height H is too large, it means that the gap Δ is too small and the lower dead point of the upper template 1 is relatively too low. At this time, it is necessary to adjust the lower punch 12 to rise, widen the gap Δ, and move the lower dead point of the upper template 1 relatively upward to reduce the cover height H. When the cover height H is found to be too small, it indicates that the gap Δ is too large and the lower dead point of the upper template 1 is relatively too high. At this time, it is necessary to adjust the lower punch 12 to lower the gap Δ, so that the lower dead point of the upper template 1 moves relatively downward, thereby increasing the cover height H.

[0030] Based on practical application tests, the adjustable buffer device of this invention can significantly improve the pass rate of crown-shaped bottle caps during long-term continuous production on a punch press. Furthermore, the adjustment time for a single bottom dead center position is approximately 0.5 to 1 hour, and it can maintain a normal and effective state for a long period after adjustment.

[0031] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any equivalent substitutions or simple improvements made based on the concept of this utility model, such as changing only the specific installation dimensions of the blade or fixing frame to adapt to rolls of different widths, or making equivalent adjustments to the button layout of the control panel, shall be considered as not departing from the spirit and scope of this utility model and shall still fall within the protection scope of this utility model patent.

Claims

1. An adjustable buffer device for a double-action punch press for crown-shaped bottle caps, characterized in that, A three-plate double-action punch press, in which the middle platen (5) is fixed and the upper platen (1) and lower platen (10) slide relative to each other, includes: The upper component is disposed on the upper template (1) of the punch press and includes a cover (2), an upper impact block (3) and an elastic element (4). The upper impact block (3) is slidably disposed inside the upper template (1). The cover (2) is fixed to the top of the upper template (1) and presses the elastic element (4). The elastic element (4) abuts against the upper impact block (3). The middle component is disposed on the middle template (5) of the punch press and includes a base (9), a bushing (8), a middle impact block (7) and an anti-detachment limiting member (6). The base (9) is fixed on the middle template (5), the bushing (8) is installed in the base (9), the middle impact block (7) is slidably disposed in the bushing (8) along the axial direction, the lower part of the middle impact block (7) is provided with an annular groove, and the anti-detachment limiting member (6) passes through the bushing (8) and extends into the annular groove to limit the sliding stroke of the middle impact block (7). The lower component is disposed on the lower template (10) of the punch press and includes a lower punch rod (12) and an adjusting locking nut (11). The lower punch rod (12) slides through the lower template (10) and the adjusting locking nut (11) is sleeved on the outside of the lower punch rod (12) and presses against the upper surface of the lower template (10). The top end of the lower punch (12) passes through the middle template (5) and abuts against the bottom end of the middle impact block (7); in the mold closing state, the lower punch (12) pushes up the middle impact block (7), so that the top end of the middle impact block (7) and the base (9) form a gap Δ, and the upper impact block (3) moves down with the upper template (1) and abuts against the top end of the middle impact block (7); by adjusting the adjusting locking nut (11) to change the extension height of the lower punch (12), the width of the gap Δ is changed, thereby realizing the fine adjustment of the bottom dead point position of the upper template (1).

2. The adjustable buffer device for a double-action punch press for crown-shaped bottle caps according to claim 1, characterized in that: The elastic element (4) is a disc spring assembly, which is composed of several disc springs stacked or paired together.

3. An adjustable buffer device for a double-action punch press for crown-shaped bottle caps according to claim 1, characterized in that: The anti-detachment limiting component (6) is a set screw. The front end of the set screw passes through the side wall through hole of the bushing (8) and is engaged in the annular groove of the middle impact block (7).

4. An adjustable buffer device for a double-action punch press for crown-shaped bottle caps according to claim 1, characterized in that: The top end of the lower punch (12) passes through the through hole provided on the middle template (5) and abuts against the bottom end of the middle impact block (7), and there is a straight sliding clearance space between the lower punch (12) and the middle impact block (7).

5. An adjustable buffer device for a double-action punch press for crown-shaped bottle caps according to claim 1, characterized in that: An anti-rotation fitting structure is provided between the bottom of the lower punch (12) and the mounting hole of the lower template (10). The anti-rotation fitting structure is used to restrict the lower punch (12) from rotating circumferentially relative to the lower template (10).

6. An adjustable buffer device for a double-action punch press for crown-shaped bottle caps according to claim 1, characterized in that: The bottom end of the lower punch (12) is provided with a hexagonal force-bearing surface for external tool drive.

Images