Connecting plug block for rotary die cutting roller and design method of connecting plug block

Abstract

The invention is used for the technical field of packaging machinery manufacturing, and discloses a connecting plug block for a rotary die cutting roller, the connecting plug block comprises two connecting roller bodies, a mounting roller body is fixedly connected between the two connecting roller bodies, and a connecting plug block groove and a main plug block groove are formed in the outer back surface of the mounting roller body; mounting holes are formed in the inner bottom surfaces of the connecting plug block groove and the main plug block groove, and a positioning hole is formed in the inner bottom surface of the main plug block groove. According to the connecting plug block for the rotary die cutting roller, the unique receding steps are designed at the two ends of the bottom of the connecting block body, the technical contradiction between thinning of the plug block, prevention of screw emitting and guarantee of the machinability of an inclined face is fundamentally solved, the receding steps provide sufficient containing space for the head of a fastening bolt, and the connecting plug block is convenient to use. Therefore, the connecting plug block is kept thin to save expensive materials, and meanwhile, firm installation can be ensured, and the bolts cannot interfere with die cutting operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of packaging machinery manufacturing, in particular to a connecting plug for a round-to-round die cutting roller and a design method thereof. BACKGROUND

[0002] In the packaging machinery industry, the round-to-round die cutting technology is widely used due to its high efficiency, especially in the die cutting link of high-end packaging such as cigarette boxes. The core component of this technology is the die cutting roller, which is provided with a knife line on its surface for die cutting. In order to ensure excellent wear resistance and service life of the knife line, the die cutting knife must be made of high-hardness powder metallurgy steel material (such as hardness up to HRC 62-64). However, such material is expensive, and if the entire roller is made of this material, the cost will be extremely high. Therefore, the conventional practice in the field is to use ordinary quenched and tempered steel material for the roller body (roller body), and only process grooves in the areas corresponding to the die cutting pattern. Then, the plug made of pre-processed powder metallurgy steel material is embedded and fixed in the grooves. This "embedded" structure effectively balances performance and cost. In order to realize die cutting of complex patterns, the plug is usually designed as two types: main plug and connecting plug. The connecting plug connects adjacent main plugs, and its two sides need to be machined with inclined surfaces that precisely match the main plug. The current mainstream manufacturing process is to initially install the connecting plug in the plug groove of the roller, and then use a numerical control machine tool (CNC) to directly mill the inclined surfaces on both sides of the roller to ensure the overall contour accuracy after the assembly of all plugs. However, there is a significant contradiction and technical problem in the existing design and method: Due to cost and lightweight considerations, it is desirable to design the thickness of the plug, especially the connecting plug, as thin as possible.

[0003] However, when the connecting plug is too thin, the countersunk screw used to fix it may protrude from the top surface of the plug, which is absolutely not allowed in the high-speed rotating die cutting process, which will damage the rollers or products. If the thickness of the connecting plug is increased to ensure that the screw does not protrude, the milling cutter will inevitably mill the bottom surface of the adjacent main plug below when milling the inclined surfaces of the connecting plug in the subsequent CNC process, resulting in damage to the main plug or the mating surface of the connecting plug and the main plug, affecting the overall assembly accuracy and strength. In summary, there is a lack of a connecting plug design scheme and assembly process that can effectively balance the relationship between "plug thickness", "reliable fixation", and "machinability" in the existing technology. The present application aims to solve this long-standing technical contradiction. SUMMARY

[0004] The present application aims to provide a connecting plug for a round-to-round die cutting roller and a design method thereof to solve the contradiction between the thickness, fixing reliability and bevel processing feasibility of the connecting plug.

[0005] To achieve the above object, the present application provides the following technical solution: a connecting plug for a round-to-round die cutting roller, comprising connecting roller bodies, two of which are fixedly connected with a mounting roller body, the outer back surface of the mounting roller body is provided with a connecting plug groove and a main plug groove, the inner bottom surface of the connecting plug groove and the main plug groove is provided with a mounting hole, the inner bottom surface of the main plug groove is provided with a positioning hole, the inner part of the main plug groove is fitted with a main plug body, the inner part of the connecting plug groove is fitted with a connecting block body, the outer lateral surface of the main plug body and the connecting block body is provided with a clearance hole, and the outer surface of the main plug body is provided with a pin hole; The lower surface of the connecting block body is provided with a clearance step, and the two sides of the connecting block body are provided with functional bevels.

[0006] Preferably, the lower surface of the main plug body is in close contact with the inner bottom surface of the main plug groove, the clearance hole on the surface of the main plug body is opposite to the mounting hole on the inner bottom surface of the main plug groove, and the main plug body is fixedly installed on the mounting roller body through a bolt penetrating the clearance hole and the mounting hole.

[0007] The above technical solution ensures that the main plug body can be firmly fixed on the mounting roller body, and the alignment design of the clearance hole and the mounting hole provides an accurate channel for bolt installation, ensuring the stability and reliability of the connection.

[0008] Preferably, the main plug body is connected with the positioning hole through a positioning pin penetrating the pin hole, the pin hole is provided with two, and the two pin holes are symmetrically arranged at the two ends of the main plug body.

[0009] The above technical solution realizes the precise positioning of the main plug body in the circumferential and axial directions through the cooperation of the positioning pin, the symmetrically arranged pin hole and the positioning hole, effectively preventing displacement of the main plug body during work, and laying a foundation for the precise cooperation of the subsequent connecting block body.

[0010] Preferably, the lower surface of the connecting block body is in close contact with the inner bottom surface of the connecting plug groove, the clearance hole on the surface of the connecting block body is opposite to the mounting hole on the inner bottom surface of the connecting plug groove, and the connecting block body is fixedly installed on the mounting roller body through a bolt penetrating the clearance hole and the mounting hole.

[0011] The above technical solution enables the connecting block body to be reliably fixed by a bolt, and the design of the lower surface of the connecting block body in close contact with the groove bottom ensures the flatness of the installation, providing a stable process reference for the subsequent precise machining of the functional bevel on the roller.

[0012] Preferably, the yielding step is designed in L shape and is designed in concave shape.

[0013] By using the above technical solution, the L-shaped concave yielding step provides a special accommodating space for the head of the fastening bolt, so that the connecting block body can be ensured to be firmly installed while maintaining a relatively thin thickness to save materials, and the bolt head will not exceed the upper surface to avoid interference.

[0014] Preferably, the functional slope is in line with the two side outer surfaces of the main block body, and the functional slope is designed in an eight-shaped design.

[0015] By using the above technical solution, the eight-shaped design of the functional slope forms a large area of slope contact with the side surface of the main block body. Compared with the straight wall butt joint, this surface contact matching method has better radial and circumferential bearing capacity, so that the connection between the block bodies is more stable.

[0016] A design method of a connecting block for a round-to-round die cutting roller, comprising the following steps: S1: First, the connecting block groove and the main block groove are machined on the mounting roller body of the roller by a numerical control machining center, and the mounting hole for fixing and the positioning hole for precise positioning are machined at the same time; S2: The connecting block body is preliminarily assembled into the connecting block groove, and the temporary fixing part is used for preliminary positioning and fixing; S3: In the state that the connecting block body is fixed to the roller, the two sides of the connecting block body are cut by using a numerical control machining equipment to form a functional slope matched with the main block body; S4: After the slope machining is completed, the connecting block body is disassembled, then the main block body is formally assembled into the main block groove, and the circumferential and axial precise positioning is realized by the cooperation of the positioning pin and the positioning hole; S5: The connecting block body with the machined functional slope is assembled into the connecting block groove again, so that the functional slope is closely matched with the two side outer surfaces of the main block body; S6: Finally, the main block body and the connecting block body are finally and firmly fixed and installed on the mounting roller body by using the fastening bolt passing through the yielding hole and the mounting hole in sequence, and the assembly of the whole block component is completed Preferably, in step S3, the machining of the functional slope is carried out when the connecting block body is installed on the roller tooling, and a vertical milling cutter is used for precise milling to ensure the shape accuracy and position accuracy of the functional slope, so as to ensure the cooperation quality with the main block body.

[0017] By using the above technical solution, the milling is carried out in the state that the connecting block body is installed on the roller, so that the machining reference of the functional slope is strictly consistent with the rotation center of the roller, thereby ensuring the cooperation accuracy of the functional slope with the main block body and the accuracy of the overall die cutting contour.

[0018] Preferably, in step S1, the depth of the connecting plug block slot is designed to consider the accommodation step structure at the bottom of the connecting block body. By reasonable depth tolerance design, it is ensured that the upper surface of the connecting block body is smoothly transitioned with the outer cylindrical surface of the roller after installation, and at the same time, the necessary accommodation space is provided for the accommodation step.

[0019] By using the above technical scheme, through accurate depth tolerance design, the smooth transition of the upper surface of the connecting block body with the outer cylindrical surface of the roller after installation is ensured, which does not affect the die cutting operation, and at the same time, the necessary space is provided for the accommodation step, realizing the unity of structure function and appearance requirement.

[0020] Compared with the prior art, the beneficial effects of the connecting plug block for the round-to-round die cutting roller are as follows: 1. By designing a unique accommodation step at both ends of the bottom of the connecting block body, the technical contradiction between "plug block thinning" and "preventing screw from protruding" and "ensuring the processability of the inclined surface" is fundamentally solved. The accommodation step provides sufficient accommodation space for the head of the fastening bolt, so that the connecting plug block can ensure firm installation and the bolt does not interfere with the die cutting operation while maintaining a relatively thin thickness to save expensive materials; 2. The functional inclined surfaces on both sides of the connecting plug block realize face contact with the side wall of the main plug block body. Compared with the simple straight wall butt joint, this inclined surface fitting structure has better radial and circumferential bearing capacity, so that the connection of the entire plug block ring is more stable and reliable, and the micro displacement caused by impact under high-speed operation is effectively avoided, thereby ensuring the long-term stability of the die cutting precision; 3. The step-by-step assembly and processing method of "first installation and then milling" proposed in the present application ensures that the processing reference of the two functional inclined surfaces is strictly consistent with the center of rotation of the roller. The inclined surface processed by this method can be perfectly fitted with the main plug block, avoiding the cumulative error that may be caused by separate processing of the plug block and then assembly, and significantly improving the contour accuracy of the final product; 4. On the one hand, the thinning design of the connecting plug block directly saves the high-cost powder metallurgy steel material, and on the other hand, the design allows smaller size cutters to be used for inclined surface processing, which reduces the requirements for cutters and reduces the cutter wear during processing. In addition, the simplified assembly logic also reduces the technical dependence on operators and improves the assembly efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present application; Figure 2 It is a schematic diagram of the connecting roller body, the installation roller body and the connecting plug block slot connection three-dimensional structure of the present application; Figure 3 It is a schematic diagram of the installation roller body, the main plug block body and the pin hole connection side cross-sectional structure of the present application; Figure 4 Figure is a schematic diagram of the connection of the connecting block, the displacement step and the functional slope of the application; Figure 5 Figure is a schematic diagram of the connection of the main plug block, the displacement hole and the pin hole of the application.

[0022] In the figure: 1, connecting roller body; 2, mounting roller body; 3, connecting plug block groove; 4, main plug block groove; 5, mounting hole; 6, positioning hole; 7 main plug block; 8, connecting block; 9, displacement hole; 10, pin hole; 11, displacement step; 12, functional slope. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the application.

[0024] Please refer to Figures 1-5 The application provides a technical solution: a connecting plug for a round-to-round die cutting roller.

[0025] Embodiment one: basic structure and assembly method The embodiment provides a basic structure of a connecting plug for a round-to-round die cutting roller and a core assembly method thereof.

[0026] Please refer to Figures 1 to 4 The connecting plug assembly comprises a mounting roller body 2, on which a connecting plug block groove 3 and a main plug block groove 4 are machined, the bottom of the connecting plug block groove 3 and the main plug block groove 4 is provided with a mounting hole 5, the bottom of the main plug block groove 4 is further provided with a positioning hole 6, a main plug block 7 is mounted in the main plug block groove 4 through a positioning pin cooperating with the positioning hole 6, and a connecting block 8 is mounted in the connecting plug block groove 3. The key of the embodiment is that the two end lower surfaces of the connecting block 8 are provided with displacement steps 11, the displacement steps 11 are designed as L-shaped concave, the depth (H1) is preferably 0.5-1.5 mm, and the width (W1) is preferably 2-5 mm. This design ensures that when a bolt is used to fix the connecting block 8 through the displacement hole 9 and the mounting hole 5, the bolt head can be completely accommodated in the space of the displacement step 11, and even if the overall thickness of the connecting block 8 is thin, the upper surface can also remain flat without the risk of the bolt protruding. The two sides of the connecting block 8 are functional slopes 12, which tightly fit the two side outer surfaces of the main plug block 7 to form stable slope cooperation. The assembly method comprises the following steps: S1: Connect the plug block groove 3, the main plug block groove 4, the mounting hole 5 and the positioning hole 6 on the installation roller body 2 by CNC machining; S2: The connecting block body 8 is initially placed in the connecting plug block groove 3, and is lightly fixed with a temporary positioning pin or low-strength adhesive; S3: Use a vertical milling cutter to finish machining the two-sided functional bevel 12 of the installed connecting block body 8 on the CNC machine tool. The machining parameters can be: spindle speed 2500 rpm, feed speed 600 mm / min; S4: After the machining is completed, the connecting block body 8 is removed. The main plug block body 7 is accurately installed into the main plug block groove 4 through the positioning pin; S5: The connecting block body 8 with the machined functional bevel 12 is reinstalled into the connecting plug block groove 3, so that the functional bevel 12 is completely in contact with the side surface of the main plug block body 7; S6: Use an internal hexagonal bolt to pass through the relief hole 9 and the mounting hole 5 in sequence, and finally fasten the main plug block body 7 and the connecting block body 8 on the installation roller body 2 with a specified torque.

[0027] Example two: optimization design of relief step This example optimizes the structure of the relief step 11 based on example one to further improve the connection strength and avoid stress concentration.

[0028] In this example, the corner of the relief step 11 (i.e. the junction of the vertical and horizontal surfaces of the L-shaped) adopts a circular arc transition design, and the circular arc radius R is preferably 0.2-0.5 mm. This design can effectively reduce the stress concentration at the corner of the step under die cutting impact load, thereby improving the fatigue life and reliability of the connecting block body 8; In addition, the horizontal surface of the relief step 11 (i.e. the pressure bearing surface in contact with the installation roller body 2) can be shot blasted to introduce surface compressive stress, further enhancing its ability to resist fretting wear; Example three: assembly process variation for complex patterns This example mainly describes the assembly process variation when the die cutting pattern is very complex and requires multiple connecting plugs to be connected in sections.

[0029] In this case, the assembly sequence is particularly important. The method includes: S1: First, process all plug block grooves and hole positions on the installation roller body 2; S2: According to the splicing logic of the pattern, determine a reference main plug block (for example, the longest or most core plug block in the pattern) and install it first; S3: Then, install the connecting block body 8 adjacent to the reference main plug block in sequence, and immediately process the functional bevel 12. After completing the bevel machining of each connecting block body 8, install the main plug block body 7 connected at the other end; S4: repeat step S3, starting from the "reference master block", and install and process outwardly like a jigsaw puzzle until the entire pattern is completed; Figure 1 S4: repeat step S3, starting from the "reference master block", and install and process outwardly like a jigsaw puzzle until the entire pattern is completed; S5: finally, all blocks are uniformly fastened with bolts; This "inside-out, segment-by-segment processing" variant method can effectively control the cumulative error of complex pattern assembly, ensuring the overall accuracy of the final profile.

[0030] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and variations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A connecting plug for a rotary die-cutting roller, comprising a connecting roller body (1), wherein a mounting roller body (2) is fixedly connected between two of the connecting roller bodies (1), characterized in that: The mounting roller body (2) has a connecting plug groove (3) and a main plug groove (4) on its outer back side. The connecting plug groove (3) and the main plug groove (4) have mounting holes (5) on their inner bottom surfaces. The main plug groove (4) has positioning holes (6) on its inner bottom surface. The main plug (7) is fitted inside the main plug groove (4). The connecting plug groove (3) has a connecting block (8) fitted inside the connecting plug groove (3). The main plug (7) and the connecting block (8) have clearance holes (9) on their outer surfaces. The main plug (7) has pin holes (10) on its outer surface.

2. A connecting plug for a circular die-cutting roller according to claim 1, characterized in that: The lower surface of the main plug block (7) is in contact with the inner bottom surface of the main plug block groove (4), and the clearance hole (9) on the surface of the main plug block (7) is directly opposite the mounting hole (5) on the inner bottom surface of the main plug block groove (4). The main plug block (7) is fixedly installed to the mounting roller (2) by bolts passing through the clearance hole (9) and the mounting hole (5).

3. A connecting plug for a circular die-cutting roller according to claim 1, characterized in that: The main plug block (7) is engaged with the positioning hole (6) by a positioning pin through the pin hole (10), and there are two pin holes (10), and the two pin holes (10) are symmetrically arranged at both ends of the main plug block (7).

4. A connecting plug for a circular die-cutting roller according to claim 1, characterized in that: The lower surface of the connecting block (8) is in contact with the inner bottom surface of the connecting plug groove (3), and the clearance hole (9) on the surface of the connecting block (8) is directly opposite the mounting hole (5) on the inner bottom surface of the connecting plug groove (3). The connecting block (8) is fixedly installed to the mounting roller (2) by bolts passing through the clearance hole (9) and the mounting hole (5).

5. A connecting plug for a circular die-cutting roller according to claim 1, characterized in that: The lower surfaces of both ends of the connecting block (8) are provided with clearance steps (11), and functional inclined surfaces (12) are provided on both sides of the connecting block (8).

6. A connecting plug for a circular die-cutting roller according to claim 5, characterized in that: The yielding step (11) is L-shaped and concave.

7. A connecting plug for a circular die-cutting roller according to claim 5, characterized in that: The functional inclined surface (12) is in contact with the outer surfaces of both sides of the main plug block (7), and the functional inclined surface (12) is designed in a figure-eight shape.

8. A design method for a connecting plug for a circular die-cutting roller as described in any one of claims 1-7, characterized in that: Includes the following steps: S1: First, the connecting plug groove (3) and the main plug groove (4) are machined on the mounting roller body (2) of the roller by a CNC machining center, and the mounting hole (5) for fixing and the positioning hole (6) for precise positioning are machined at the same time. S2: Initially assemble the connecting block (8) into the connecting plug groove (3), and use temporary fasteners for initial positioning and fixation; S3: With the connecting block (8) fixed to the roller, use CNC machining equipment to cut and process both sides of it to form a functional inclined surface (12) that cooperates with the main plug block (7). S4: After completing the bevel machining, disassemble the connecting block (8), and then formally assemble the main plug block (7) into the main plug block groove (4), and achieve precise circumferential and axial positioning through the cooperation of the positioning pin and the positioning hole (6); S5: Reassemble the connecting block (8) with the pre-processed functional inclined surface (12) back into the connecting plug groove (3) so that the functional inclined surface (12) and the outer surfaces of the two sides of the main plug block (7) can achieve a tight inclined surface fit. S6: Finally, use the fastening bolts to pass through the relief hole (9) and the mounting hole (5) in sequence to firmly fix the main plug block (7) and the connecting block (8) on the mounting roller (2) to complete the assembly of the entire plug block assembly.

9. A design method for a connecting plug for a circular die-cutting roller according to claim 8, characterized in that: In step S3, the processing of the functional inclined surface (12) is carried out on the roller tooling of the connecting block (8) by precision milling with an end mill to ensure the shape accuracy and position accuracy of the functional inclined surface (12), thereby ensuring the fit quality between it and the main plug block (7).

10. A design method for a connecting plug for a circular die-cutting roller according to claim 8, characterized in that: In step S1, the depth design of the connecting block groove (3) needs to take into account the clearance step (11) structure at the bottom of the connecting block (8). Through reasonable depth tolerance design, it is ensured that the upper surface of the connecting block (8) and the outer circle of the roller are smoothly connected after installation, while providing necessary accommodation space for the clearance step (11).

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