A processing method for metal cavity groove, packaging substrate and application

Abstract

The present invention belongs to the technical field of packaging substrates, and discloses a processing method for metal cavity grooves, a packaging substrate and an application. The method optimizes the drill belt path by designing and performing segmented cutting; processes one side in sequence; processes the other side by double-sided processing; and designs a computer-aided manufacturing program. The present invention utilizes CO2 laser drilling and cutting, and can achieve rapid cutting of the groove body by optimizing the drill belt design and the groove body processing sequence. In order to solve the above-mentioned quality, time-consuming and cost problems, the present invention proposes a processing method for metal cavity grooves (CO2 laser drilling and cutting). The method is highly achievable and can be directly promoted and used; the method of the present invention can significantly improve the processing efficiency by 3‑6 times; the present invention can reduce the processing cost by more than 80% by improving the product processing yield and processing efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of packaging substrates, and in particular relates to a processing method for a metal cavity groove, a packaging substrate and an application method. Background Art

[0002] The use of conventional through-hole processes has led to increasingly higher layer counts, thicker boards, and larger dimensions in printed circuit board (PCB) designs, posing significant challenges to PCB manufacturing. This is primarily due to the fact that the number of layers, dimensions, thickness, and through-hole plating capabilities of PCBs have reached the limits of manufacturers' equipment. Consequently, there is limited room for improvement in the system's signal transmission capacity.

[0003] To further increase the system's signal transmission capacity and meet market demand for high-capacity circuits, a double-sided mechanical blind via process can be used. Mechanical blind vias are formed on both the top and bottom surfaces of the printed circuit board to transmit electrical signals between different layers. However, this process is complex, challenging to manufacture, and expensive to produce. Furthermore, due to factors such as the easy accumulation of chemicals in the blind vias, this results in poor product reliability and low yield rates.

[0004] CO2 laser drilling and cutting can achieve rapid slot cutting by optimizing drill belt design and slot processing sequence. Since CO2 laser drilling and cutting uses multiple laser beams for single-point processing, tandem processing achieves the cutting purpose. Furthermore, due to the inherent Gaussian wave characteristics of the laser, the laser forms a tapered shape after processing. Therefore, double-sided processing is required to completely remove the slot.

[0005] Through the above analysis, the problems and defects of the existing technology are: the existing hardware numerical control (HardNC) processing and manufacturing method consumes a lot of auxiliary materials and knives, and the cost is high. Summary of the Invention

[0006] To overcome the problems existing in the related art, the embodiments disclosed in the present invention provide a processing method for a metal cavity groove, a packaging substrate and applications, and specifically relate to a production process processing method for a plating through hole (PTH) groove.

[0007] The technical solution is as follows: The processing method for the metal cavity groove includes the following steps:

[0008] S1, segmented cutting is performed by designing and optimizing the drill belt path;

[0009] S2, process one side in sequence;

[0010] S3, the other side is processed by double-sided processing;

[0011] S4, designed by computer-aided manufacturing program.

[0012] In step S1, optimizing the drill belt path and performing segmented cutting includes:

[0013] The distance between the drill belt and the slot boundary of the copper clad laminate used for ICS package carrier is determined to be B1, the retained distance for the first processing is B2, the distance for the secondary processing is B3, the spacing between the drill belt holes in the first processing is B4, the spacing between the drill belt holes in the secondary processing is B5, the target aperture of the drill belt design for the first processing is A1, and the aperture of the secondary processing laser design program is A2.

[0014] Further, B1=10 μm, B2=150 μm, B3=400 μm, B4=45 μm, B5=45 μm, A1=90 μm, A2=91 μm.

[0015] In step S2 , the processing in sequence includes: a first surface to be processed, a first portion of processing, a second processing of the first surface, and completion of the processing of the first surface.

[0016] In step S3, processing the other side in a double-sided processing manner includes: the second side is to be processed, the second part is processed, the second side is processed, and the second side processing is completed.

[0017] In step S4, the computer-aided manufacturing program includes the following steps: optimizing the drill belt path by designing in a progressive relationship, performing segmented cutting, processing one side in sequence, and processing the other side by double-sided processing.

[0018] Furthermore, the step of optimizing the drill belt path by design according to the progressive relationship includes:

[0019] Step 1: Obtain the number and location data of drill belt hole spacing, initialize N drill belt shortcuts and add them into the drill belt shortcut candidate set, calculate the coupling between each drill belt shortcut and the maximum drill belt path, and initialize the mark;

[0020] The coupling calculation formula between the drill belt shortcut and the drill belt maximum path is as follows:

[0021]

[0022] Among them, citysize is the total number of drill hole spacings that the drill belt equipment must pass through, x j 、y j is the latitude and longitude of the drill hole spacing j, ab i A shortcut for drilling belts;

[0023] The specific process of initialization marking is to assign an initial optimal value of 1 and a drill belt shortcut deviation attribute value of 1 to each drill belt shortcut;

[0024] Step 2: Sort the calculated couplings between the maximum drill belt path and the drill belt shortcuts, select the top n drill belt shortcuts with the highest couplings, approve each drill belt shortcut, and update the mark of the approved drill belt shortcuts;

[0025] Said approval includes:

[0026] Drilling with shortcut ab i The approved quantity satisfies the following formula:

[0027]

[0028] Where a and b are both constants, and a>0, and max_clone is the maximum approved number;

[0029] The specific process of updating the mark is to add 1 to the approved drill belt shortcut deviation attribute value;

[0030] Step 3: Change the approved drill belt shortcut and update the mark of the changed drill belt shortcut;

[0031] The changes include:

[0032] The higher the coupling, the smaller the probability of changing the drill belt shortcut, which is changed using the change operator;

[0033] The change operator is:

[0034]

[0035] Among them, operator(σ,ab i ) is a shortcut to drill with ab i The spacing between the holes in a drill belt and the spacing between the holes in the neighboring drill belts with a spacing of σ are cross-changed. σ is determined based on the size of the drill belt shortcut coupling;

[0036] The specific process of updating the mark is to assign an initial optimal value of 1 and a drill belt shortcut deviation attribute value of 1 to the changed drill belt shortcut;

[0037] Step 4: Recalculate the coupling of the changed drill belt shortcuts, select the N drill belt shortcuts with the highest coupling with the maximum drill belt path, and put them into the drill belt shortcut candidate set. Add 1 to the optimal value of these N drill belt shortcuts.

[0038] Step 5: Determine whether the drill belt shortcut meets the drill belt shortcut missing threshold. If so, perform the missing operation; if not, go to step 6;

[0039] The missing process includes: missing judgment, calculating the missing degree of the drill belt shortcut according to the current marking state of the drill belt shortcut, and comparing it with the missing threshold. When the drill belt shortcut meets the missing judgment condition, it is replaced with a new drill belt shortcut; obtaining the current algorithm iteration number gen, performing a gen round of approval change operation on the new drill belt shortcut; and marking the drill belt shortcut initialization for the mature drill belt shortcut selected after the operation;

[0040] The missing formula is:

[0041]

[0042] Where popsize is the size of the candidate set of drill belt shortcuts, ab new is a new drill belt shortcut randomly generated from the solution space, pre(·) is the drill belt shortcut preprocessing process, and c is the missing threshold; calculate the missing degree of the drill belt shortcut Among them, iteration(ab i ) indicates drill belt shortcut ab i The number of iterations in the candidate drilling shortcut set, i.e. the optimal value, strength(ab i ) indicates drill belt shortcut ab i Deviation attribute value in the current iteration drill belt shortcut candidate set;

[0043] Step 6: Determine whether the algorithm meets the evaluation function call times. If so, output the optimal path, optimal path graph, and optimal path distance. If not, return to step 2.

[0044] Another object of the present invention is to provide a metal cavity slot, which is manufactured according to the processing method for the metal cavity slot.

[0045] Another object of the present invention is to provide a packaging substrate manufactured according to the processing method for the metal cavity groove.

[0046] Another object of the present invention is to provide an application of the processing method for the metal cavity groove in the manufacture of a motor vehicle controller circuit board.

[0047] Another object of the present invention is to provide an application of the processing method for the metal cavity groove in the manufacture of control circuit boards in the lighting field.

[0048] Another object of the present invention is to provide an application of the processing method for the metal cavity groove in the manufacture of control circuit boards in the chemical production field.

[0049] Combining all of the above technical solutions, the present invention offers the following advantages and positive effects: The present invention utilizes CO2 laser drilling and cutting, optimizing drill belt design and slot processing sequence to achieve rapid slot cutting. To address the aforementioned quality, time consumption, and cost issues, the present invention proposes a method for processing metal cavity slots (CO2 laser drilling and cutting). This method is highly achievable and readily applicable. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure;

[0051] Figure 1 This is a flow chart of a method for processing a metal cavity groove provided by an embodiment of the present invention;

[0052] Figure 2 This is a schematic diagram of the drill belt design provided by an embodiment of the present invention;

[0053] Figure 3 It is a sequential processing diagram provided by an embodiment of the present invention;

[0054] Figure 4 This is a diagram of a double-sided processing method provided by an embodiment of the present invention;

[0055] Figure 5 This is a computer-aided manufacturing program design rendering provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0056] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0057] Example 1, as Figure 1 As shown, the processing method for a metal cavity groove provided by an embodiment of the present invention includes the following steps:

[0058] S1, by designing and optimizing the drill belt path, segmented cutting is performed to improve the problem of cutting debris blocking the processing area, so as to achieve the purpose of smooth cutting.

[0059] in Figure 2The production material is a common copper-clad laminate for ICS package carriers. B1 is the distance between the drill strip and the notch edge, B2 is the initial processing reserve distance, B3 is the secondary processing distance, B4 is the initial processing drill strip hole connection design pitch (hole center spacing), B5 is the secondary processing drill strip hole connection design pitch (hole center spacing), A1 is the initial processing drill strip design target aperture, and A2 is the secondary processing laser design program aperture. The specific design relationship is as follows:

[0060] B1=10μm, B2=150μm, B3=400μm, B4=45μm, B5=45μm, A1=90μm, A2=91μm;

[0061] The drill belt is extended 10μm outward on one side relative to the slot boundary. The initial processing drill belt aperture is 90μm, the hole pitch is 45μm, and a 150μm area is left unprocessed in the initial processing. The secondary processing drill belt aperture is 91μm, the hole pitch is 45μm, the secondary processing distance is 400μm, and the center of the processing area coincides with the center of the area retained in the initial processing.

[0062] S2, process one side in sequence, the processing process is as follows Figure 3 As shown; including: the first side to be processed, the first part of the processing, the first side secondary processing, the first side processing is completed;

[0063] S3, double-sided processing is used to process the other side. The process is as follows Figure 4 As shown; including: the second side to be produced, the second part processing, the second side processing, and the second side processing completed;

[0064] S4, computer-aided manufacturing program design, e.g. Figure 5 shown.

[0065] In an embodiment of the present invention, in step S4, the computer-aided manufacturing program includes: executing the steps of optimizing the drill belt path by design in a progressive relationship, performing segmented cutting, sequentially processing one side, and processing the other side using a double-sided processing method.

[0066] In an embodiment of the present invention, optimizing the drill belt path by designing and performing segmented cutting includes:

[0067] Step 1: Obtain the number and location data of drill belt hole spacing, initialize N drill belt shortcuts and add them into the drill belt shortcut candidate set, calculate the coupling between each drill belt shortcut and the maximum drill belt path, and initialize the mark;

[0068] The coupling calculation formula between the drill belt shortcut and the drill belt maximum path is as follows:

[0069]

[0070] Among them, citysize is the total number of drill hole spacings that the drill belt equipment must pass through, x j 、y j is the latitude and longitude of the drill hole spacing j, ab i A shortcut for drilling belts;

[0071] The specific process of initialization marking is to assign an initial optimal value of 1 and a drill belt shortcut deviation attribute value of 1 to each drill belt shortcut;

[0072] Step 2: Sort the calculated couplings between the maximum drill belt path and the drill belt shortcuts, select the top n drill belt shortcuts with the highest couplings, approve each drill belt shortcut, and update the mark of the approved drill belt shortcuts;

[0073] Said approval includes:

[0074] Drilling with shortcut ab i The approved quantity satisfies the following formula:

[0075]

[0076] Where a and b are both constants, and a>0, and max_clone is the maximum approved number;

[0077] The specific process of updating the mark is to add 1 to the approved drill belt shortcut deviation attribute value;

[0078] Step 3: Change the approved drill belt shortcut and update the mark of the changed drill belt shortcut;

[0079] The changes include:

[0080] The higher the coupling, the smaller the probability of changing the drill belt shortcut, which is changed using the change operator;

[0081] The change operator is:

[0082]

[0083] Among them, operator(σ,ab i ) is a shortcut to drill with ab i The spacing between the holes in a drill belt and the spacing between the holes in the neighboring drill belts with a spacing of σ are cross-changed. σ is determined based on the size of the drill belt shortcut coupling;

[0084] The specific process of updating the mark is to assign an initial optimal value of 1 and a drill belt shortcut deviation attribute value of 1 to the changed drill belt shortcut;

[0085] Step 4: Recalculate the coupling of the changed drill belt shortcuts, select the N drill belt shortcuts with the highest coupling with the maximum drill belt path, and put them into the drill belt shortcut candidate set. Add 1 to the optimal value of these N drill belt shortcuts.

[0086] Step 5: Determine whether the drill belt shortcut meets the drill belt shortcut missing threshold. If so, perform the missing operation; if not, go to step 6;

[0087] The missing process includes: missing judgment, calculating the missing degree of the drill belt shortcut according to the current marking state of the drill belt shortcut, and comparing it with the missing threshold. When the drill belt shortcut meets the missing judgment condition, it is replaced with a new drill belt shortcut; obtaining the current algorithm iteration number gen, performing a gen round of approval change operation on the new drill belt shortcut; and marking the drill belt shortcut initialization for the mature drill belt shortcut selected after the operation;

[0088] The missing formula is:

[0089]

[0090] Where popsize is the size of the candidate set of drill belt shortcuts, ab new is a new drill belt shortcut randomly generated from the solution space, pre(·) is the drill belt shortcut preprocessing process, and c is the missing threshold; calculate the missing degree of the drill belt shortcut Among them, iteration(ab i ) indicates drill belt shortcut ab i The number of iterations in the candidate drilling shortcut set, i.e. the optimal value, strength(ab i ) indicates drill belt shortcut ab i Deviation attribute value in the current iteration drill belt shortcut candidate set;

[0091] Step 6: Determine whether the algorithm meets the evaluation function call times. If so, output the optimal path, optimal path graph, and optimal path distance. If not, return to step 2.

[0092] The above-mentioned design of the present invention optimizes the drill belt path and performs segmented cutting, thereby ensuring the requirement of accurate processing of the metal cavity groove.

[0093] Example 2: An embodiment of the present invention provides a metal cavity groove, which is manufactured according to the processing method for the metal cavity groove.

[0094] An embodiment of the present invention further provides a packaging substrate, which is manufactured according to the processing method for the metal cavity groove.

[0095] An embodiment of the present invention also provides an application of the processing method for the metal cavity groove in manufacturing a motor vehicle controller circuit board.

[0096] An embodiment of the present invention further provides an application of the processing method for the metal cavity groove in manufacturing a control circuit board in the lighting field.

[0097] An embodiment of the present invention further provides an application of the processing method for the metal cavity groove in the manufacture of control circuit boards in the field of chemical production.

[0098] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0099] Application experiments show that the method of the present invention can significantly improve processing efficiency by 3-6 times; the present invention can reduce processing costs by more than 80% by improving product processing yield and processing efficiency.

[0100] The above description is only a preferred specific implementation method of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by any technician familiar with this technical field within the technical scope disclosed by the present invention and within the spirit and principles of the present invention should be covered by the scope of protection of the present invention.

Claims

1. A method for processing a metal cavity groove, characterized in that: The method comprises the following steps: S1, segmented cutting is performed by designing and optimizing the drill belt path; S2, process one side in sequence; S3, the other side is processed by double-sided processing; S4, designed by computer-aided manufacturing procedures; In step S4, the computer-aided manufacturing program includes: executing the steps of optimizing the drill belt path by designing in a progressive relationship, performing segmented cutting, processing one side in sequence, and processing the other side by using a double-sided processing method; The step of optimizing the drill belt path by design according to the progressive relationship includes: Step 1: Obtain the number and location data of drill belt hole spacing, initialize N drill belt shortcuts and add them into the drill belt shortcut candidate set, calculate the coupling between each drill belt shortcut and the maximum drill belt path, and initialize the mark; The coupling calculation formula between the drill belt shortcut and the drill belt maximum path is as follows: Among them, citysize is the total number of drill hole spacings that the drill belt equipment must pass through, x j 、y j is the latitude and longitude of the drill hole spacing j, ab i A shortcut for drilling belts; The specific process of initialization marking is to assign an initial optimal value of 1 and a drill belt shortcut deviation attribute value of 1 to each drill belt shortcut; Step 2: Sort the calculated couplings between the maximum drill belt path and the drill belt shortcuts, select the top n drill belt shortcuts with the highest couplings, approve each drill belt shortcut, and update the mark of the approved drill belt shortcuts; Said approval includes: Drilling with shortcut ab i The approved quantity satisfies the following formula: Where a and b are both constants, and a>0, and max_clone is the maximum approved number; The specific process of updating the mark is to add 1 to the approved drill belt shortcut deviation attribute value; Step 3: Change the approved drill belt shortcut and update the mark of the changed drill belt shortcut; The changes include: The higher the coupling, the smaller the probability of changing the drill belt shortcut, which is changed using the change operator; The change operator is: Among them, operator(σ,ab i ) is a shortcut to drill with ab i The spacing between the holes in a drill belt and the spacing between the holes in the neighboring drill belts with a spacing of σ are cross-changed. σ is determined based on the size of the drill belt shortcut coupling; The specific process of updating the mark is to assign an initial optimal value of 1 and a drill belt shortcut deviation attribute value of 1 to the changed drill belt shortcut; Step 4: Recalculate the coupling of the changed drill belt shortcuts, select the N drill belt shortcuts with the highest coupling with the maximum drill belt path, and put them into the drill belt shortcut candidate set. Add 1 to the optimal value of these N drill belt shortcuts. Step 5: Determine whether the drill belt shortcut meets the drill belt shortcut missing threshold. If so, perform the missing operation; if not, go to step 6; The missing process includes: missing judgment, calculating the missing degree of the drill belt shortcut according to the current marking state of the drill belt shortcut, and comparing it with the missing threshold. When the drill belt shortcut meets the missing judgment condition, it is replaced with a new drill belt shortcut; obtaining the current algorithm iteration number gen, performing a gen round of approval change operation on the new drill belt shortcut; and marking the drill belt shortcut initialization for the mature drill belt shortcut selected after the operation; The missing formula is: Where popsize is the size of the candidate set of drill belt shortcuts, ab new is a new drill belt shortcut randomly generated from the solution space, pre(·) is the drill belt shortcut preprocessing process, and c is the missing threshold; calculate the missing degree of the drill belt shortcut Among them, iteration(ab i ) indicates drill belt shortcut ab i The number of iterations in the candidate drilling shortcut set, i.e. the optimal value, strength(ab i ) indicates drill belt shortcut ab i Deviation attribute value in the current iteration drill belt shortcut candidate set; Step 6: Determine whether the algorithm meets the evaluation function call times. If so, output the optimal path, optimal path graph, and optimal path distance. If not, return to step 2.

2. The method for processing a metal cavity groove according to claim 1, characterized in that: In step S1, optimizing the drill belt path and performing segmented cutting includes: The distance between the drill belt and the slot boundary of the copper clad laminate used for ICS package carrier is determined to be B1, the retained distance for the first processing is B2, the distance for the secondary processing is B3, the spacing between the drill belt holes in the first processing is B4, the spacing between the drill belt holes in the secondary processing is B5, the target aperture of the drill belt design for the first processing is A1, and the aperture of the secondary processing laser design program is A2.

3. The method for processing a metal cavity groove according to claim 2, characterized in that: B1=10μm, B2=150μm, B3=400μm, B4=45μm, B5=45μm, A1=90μm, A2=91μm.

4. The method for processing a metal cavity groove according to claim 1, characterized in that: In step S2 , the processing in sequence includes: a first surface to be processed, a first portion of processing, a second processing of the first surface, and completion of the processing of the first surface.

5. The method for processing a metal cavity groove according to claim 1, characterized in that: In step S3, processing the other side in a double-sided processing manner includes: the second side is to be processed, the second part is processed, the second side is processed, and the second side processing is completed.

6. A metal cavity tank, characterized in that: The metal cavity groove is manufactured according to the processing method for the metal cavity groove according to any one of claims 1-5.

7. A packaging substrate, characterized in that: The packaging substrate is manufactured according to the processing method for the metal cavity groove according to any one of claims 1-5.

8. Application of the method for processing a metal cavity groove according to any one of claims 1 to 5 in manufacturing a motor vehicle controller circuit board, a lighting field control circuit board, or a chemical production field control circuit board.

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