A method for molding a circuit board using a die

Abstract

The application discloses a circuit board die forming method, characterized in that the method comprises the following steps: drilling auxiliary holes at the to-be-die-formed slot holes of the circuit board, wherein when the slot hole contains a right angle, a circle hole with a diameter of 0.45-0.65 mm is first drilled at the right angle; when the slot hole contains an acute angle and the maximum width d of the acute angle is less than 0.8 mm, an auxiliary hole with a diameter of 0.45-0.65 mm is drilled at the acute angle, and the auxiliary hole does not exceed a forming line; when the slot hole is a slot hole and the width of the slot hole is less than 2.54 mm, an auxiliary hole with the same width as the slot hole is drilled at each end of the slot hole; when the slot hole in the board is close to the forming line, a buffer slot is drilled outside the forming line, and the length of the buffer slot is twice the diameter of the slot hole; when the slot hole is a groove, the width a of the groove is less than 4 mm, and the width of the slot is less than half the length of the slot, an auxiliary hole is drilled at the end of the slot; when the distance a between two slot holes is less than 4 mm, a slot is opened by drilling or a hole / slot is drilled at the end of the two slot holes; die punching, and corresponding slot holes are punched out. The circuit board die forming method provided by the application can effectively avoid the phenomenon of dust accumulation in the inner slot, and effectively solve the problems of punching whitening and broken needle.

Description

Technical Field

[0001] This invention relates to the field of circuit board manufacturing technology, and more specifically to a method for die-stamping circuit boards. Background Technology

[0002] After solder masking and text printing on the PCB board, the entire PCB board needs to be shaped and segmented to obtain the circuit board of the required size and shape. In PCB manufacturing, the forming methods are mainly divided into two types: CNC forming and die stamping. Die stamping has become an important method for PCB board forming due to its high production efficiency. However, in the existing die stamping process, some slots are small, which easily leads to dust accumulation in the slots. Furthermore, uneven stress during forming can easily cause slot deformation or breakage, resulting in problems such as whitening of the punched holes and broken die pins.

[0003] Therefore, it is necessary to provide a new process to solve the above-mentioned technical problems. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method for die-stamping of circuit boards. First, auxiliary holes are drilled at appropriate positions of the die-stamping slot, and then the slot is punched out through the die-stamping process. This can effectively avoid the phenomenon of dust accumulation in the inner slot and effectively solve problems such as whitening of the punched holes and broken punching needles.

[0005] The technical solution of the present invention is as follows:

[0006] A method for die-stamping a circuit board includes the following steps:

[0007] Step S1: Drill auxiliary holes at the slots to be punched on the circuit board, wherein:

[0008] When the slot contains a right angle, first drill an inscribed circular hole with a diameter of 0.45-0.65mm at the right angle;

[0009] When the slot contains a sharp corner, and the maximum width of the sharp corner d < 0.8 mm, an auxiliary hole with a diameter of 0.45-0.65 mm is drilled at the sharp corner, and the drilled auxiliary hole does not exceed the forming line;

[0010] When the slot is a slot hole and the slot hole width is <2.54mm, drill an auxiliary hole with the same width as the slot hole at each end of the slot hole; when the slot hole is a slot hole and the slot hole length is >30mm, drill auxiliary holes in the slot and the spacing between the auxiliary holes is ≤30mm.

[0011] When the slots inside the board are close to the forming line, a buffer groove is drilled outside the forming line. The length of the buffer groove is twice the diameter of the slot.

[0012] When the slot is a groove and the groove width a < 4mm, and the groove width is less than half the groove length, an auxiliary hole is drilled at the end of the groove, and the diameter of the auxiliary hole = a - 0.25 ± 0.05mm; when the groove is located at the forming edge, an auxiliary hole with the same diameter as the groove width is drilled at the groove.

[0013] When the slot is an elliptical slot and the slot length is less than 2.5 times the slot width, there is no need to drill auxiliary holes at both ends of the slot.

[0014] When the distance a between the two slots is less than 4mm, drill a slot or drill / slot at the ends of the two slots.

[0015] Step S2: Perform die punching to punch out the corresponding slots.

[0016] Furthermore, when the two slots are on the same horizontal line, and the ends of the two slots are arc-shaped, and the distance a between the two slots is less than 4mm, auxiliary holes are drilled or auxiliary slots are opened at the ends of the two slots. The diameter of the auxiliary hole or the width of the auxiliary slot is equal to the width of the slot, and the center distance between the two auxiliary holes / auxiliary slots is ≥4mm.

[0017] Furthermore, when the two slots are set in parallel and the distance a between the two slots is less than 4 mm, one of the slots is drilled.

[0018] Furthermore, when the two slots are perpendicular and the distance a between the two slots is less than 4mm, an auxiliary slot is opened in one of the slots. The width of the auxiliary slot is equal to the width of the corresponding slot, and the length of the auxiliary slot is greater than the width of the other slot.

[0019] Furthermore, when the two slots are annular and the maximum distance a between the two slots satisfies a < 4 mm, a set of auxiliary holes are drilled on the outer side of the outer slot and the inner side of the inner slot corresponding to the maximum distance between the two. The diameter of the auxiliary holes satisfies 0.45 ≤ diameter ≤ 1.0 mm. The lower limit of the distance between two adjacent auxiliary holes is the safe distance without a hole plug, and the upper limit is ≤ 0.5 mm. The distance between the two sets of auxiliary holes and the edge of the corresponding slot is b, 0.15 ≤ b ≤ 0.25 mm.

[0020] Furthermore, when the two slots are square slots distributed on the same horizontal line, and the distance between the two slots a < 4 mm, and the distance between the inscribed circles at the right angle of the two slots d < 4 mm, auxiliary slots e and c, which are perpendicular to each other, are drilled at the ends of the two slots. Auxiliary slot e is located inside the slot, and auxiliary slot c extends outside the slot. The width of auxiliary slot e is equal to 0.5 times the width of auxiliary slot c, and the distance b between the two sides of the two auxiliary slots c with the largest distance is ≥ 4 mm.

[0021] Furthermore, when the two slots are square slots distributed on the same horizontal line, and the distance between the two slots a < 4 mm, and the distance between the inscribed circles at the right angle of the two inner slots d ≥ 4 mm, the inscribed circles at the right angle and the auxiliary slot c are drilled at the ends of the two slots. The auxiliary slot c is perpendicular to the slot and extends outside the slot.

[0022] Furthermore, when the two slots are distributed on the same horizontal line, and their ends contain a right angle and an arc segment, and the distance between the two slots a < 4 mm, and the distance between the inscribed circles at the right angle of the two inner slots d ≥ 4 mm, the inscribed circles at the right angle and the auxiliary slot c are drilled at the ends of the two slots, and the length of the auxiliary slot c is equal to the width of the slot.

[0023] Compared with the prior art, the circuit board die-stamping method provided by the present invention has the following advantages:

[0024] The circuit board die-stamping method provided by the present invention can effectively prevent die breakage and whitening of the punched holes caused by uneven force during the stamping process by drilling auxiliary holes at appropriate positions of the die-stamping slots and then punching the slots through the die-stamping process. At the same time, it can effectively avoid dust accumulation in the slots. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the first embodiment of drilling auxiliary holes in the circuit board die-stamping method of the present invention;

[0027] Figure 2 This is a schematic diagram of the second embodiment of drilling auxiliary holes in the circuit board die-stamping method of the present invention;

[0028] Figure 3 This is a schematic diagram of the third embodiment of drilling auxiliary holes in the circuit board die-stamping method of the present invention;

[0029] Figure 4 This is a schematic diagram of the fourth embodiment of drilling auxiliary holes in the circuit board die-stamping method of the present invention;

[0030] Figure 5 This is a schematic diagram of the fifth embodiment of drilling auxiliary holes in the circuit board die-stamping method of the present invention;

[0031] Figure 6 This is a schematic diagram of the sixth embodiment of drilling auxiliary holes in the circuit board die-stamping method of the present invention;

[0032] Figure 7 This is a schematic diagram of the seventh embodiment of drilling auxiliary holes in the circuit board die-stamping method of the present invention. Detailed Implementation

[0033] To enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, and to make the above-mentioned objectives, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be further described below.

[0034] It should be noted that the descriptions of these embodiments are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] A method for die-stamping a circuit board includes the following steps:

[0036] Step S1: Drill auxiliary holes at the slots to be punched on the circuit board, wherein:

[0037] When the slot contains a right angle, first drill an internal circular hole with a diameter of 0.45-0.65mm at the right angle, such as... Figure 1 a, Figure 1 As shown in b;

[0038] When the slot contains sharp corners, and the maximum width of the sharp corners, d, is less than 0.8 mm, an auxiliary hole with a diameter of 0.45-0.65 mm should be drilled at the sharp corners. The drilled auxiliary hole should not extend beyond the forming line. Figure 2 As shown;

[0039] When the slot is a slot hole and the slot hole width is less than 2.54 mm, drill an auxiliary hole with the same width as the slot hole at each end of the slot hole, such as... Figure 3 As shown; when the slot is a slot hole and the slot length is >30mm, auxiliary holes are drilled in the slot. The diameter of the auxiliary holes = slot width - 0.25 ± 0.05mm, and the spacing between the auxiliary holes ≤30mm, to facilitate chip removal during die punching. Figure 4 As shown;

[0040] When the slots inside the board are close to the forming line, a buffer groove is drilled outside the forming line. The length of the buffer groove is twice the diameter of the slot. Figure 5 As shown, m = 2d, where d is the diameter of the slot. In this embodiment, when the distance n between the slot inside the plate and the forming line is less than the corresponding value in Table 1, the process of drilling a buffer groove outside the forming line is as follows:

[0041] Table 1: Conditions for Setting External Buffer Grooves of Molding Lines

[0042]

[0043] When the slot is a groove, and the groove width a < 4mm, and the groove width is less than half the groove length, an auxiliary hole is drilled at the end of the groove. The diameter of the auxiliary hole = a - 0.25 ± 0.05mm. Figure 6 As shown in Figure a; when the groove is located at the forming edge, an auxiliary hole with a diameter equal to the groove width is drilled at the groove, such as... Figure 6 As shown in b;

[0044] When the slot is an elliptical slot and the slot length is less than 2.5 times the slot width, there is no need to drill auxiliary holes at both ends of the slot. The slot can be opened by direct drilling or punching directly out by die punch.

[0045] When the distance a between the two inner slots is less than 4mm, a slot is drilled or a hole is drilled / slotted at the ends of the two slots; specifically, the following situations are included:

[0046] (1) When the two slots are on the same horizontal line, and the ends of the two slots are arc-shaped, and the distance a between the two slots is less than 4 mm, drill auxiliary holes b or open auxiliary slots e at the ends of the two slots. The diameter of the auxiliary hole b or the width of the auxiliary slot e is equal to the slot width, and the center distance between the two auxiliary holes / auxiliary slots is ≥ 4 mm. Figure 7 As shown in a;

[0047] (2) When the two slots are set in parallel and the distance a between the two slots is less than 4mm, drill one of the slots, such as... Figure 7 As shown in b;

[0048] (3) When the two slots are perpendicular and the distance a between them is less than 4 mm, an auxiliary slot c is made in one of the slots. The width of the auxiliary slot is equal to the width of the corresponding slot, and the length of the auxiliary slot is greater than the width of the other slot. For example... Figure 7 As shown in c. In this embodiment, the widths of the two slots are denoted as b and d, respectively, and the length of the auxiliary slot is e;

[0049] (4) When the two slots are annular and the maximum distance a between them satisfies a < 4 mm, a set of auxiliary holes e are drilled on the outer side of the outer slot and the inner side of the inner slot, respectively, corresponding to the maximum distance between them. The diameter of the auxiliary holes e satisfies 0.45 ≤ diameter ≤ 1.0 mm. The lower limit of the distance between two adjacent auxiliary holes is the safe distance without plugging, and the upper limit is ≤ 0.5 mm. The distance between the two sets of auxiliary holes and the edge of the corresponding slot is b, 0.15 ≤ b ≤ 0.25 mm. Figure 7 As shown in d. The design of the auxiliary hole can reduce the stress on the die plate, prevent cracking when the lower die plate is punched, and improve the forming efficiency;

[0050] (5) When the two inner slots are square slots distributed on the same horizontal line, and the distance a between the two slots is <4mm, and the distance d between the inscribed circles at the right angle of the two inner slots is <4mm, auxiliary slots e and c, which are perpendicular to each other, are drilled at the ends of the two slots. Auxiliary slot e is located inside the slot, and auxiliary slot c extends outside the slot. The width of auxiliary slot e is equal to 0.5 times the width of auxiliary slot c, and the distance b between the two sides of the two auxiliary slots c with the largest distance is ≥4mm. Figure 7 As shown in e;

[0051] (6) When the two inner slots are square slots distributed on the same horizontal line, and the distance a between the two slots is less than 4 mm, and the distance d between the inscribed circles at the right angle of the two inner slots is greater than or equal to 4 mm, drill holes at the ends of the two slots to create the inscribed circles at the right angle and an auxiliary slot c. The auxiliary slot c is perpendicular to the slot and extends outside the slot. Figure 7 As shown in f, this prevents the lower die from breaking under stress due to the small gap between the slots and holes, as well as the holes turning white.

[0052] (7) When two inner slots are distributed on the same horizontal line, their ends contain a right angle and an arc segment, and the distance a between the two slots is less than 4 mm, and the distance d between the inscribed circles at the right angle of the two inner slots is greater than or equal to 4 mm, the inscribed circles at the right angle and an auxiliary slot c are drilled at the ends of the two slots. The length of the auxiliary slot c is equal to the width of the slot. Figure 7 As shown in g.

[0053] Step S2: Perform die punching to punch out the corresponding slots.

[0054] In this invention, the minimum die punch diameter is 1.5mm, the minimum distance between the die punch channel plate edges is 2mm, and the maximum die thickness is <2.0mm.

[0055] The circuit board die-stamping method provided by the present invention can effectively prevent the die from cracking and the punching holes from turning white due to uneven force during the stamping process by drilling auxiliary holes at appropriate positions of the die-stamping slots and then punching the slots. At the same time, it can effectively avoid dust accumulation in the slots.

[0056] The embodiments of the present invention have been described in detail above, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations made to these embodiments without departing from the principles and spirit of the present invention still fall within the protection scope of the present invention.

Claims

1. A method for die-stamping a circuit board, characterized in that, Includes the following steps: Step S1: Drill auxiliary holes at the slots to be punched on the circuit board, wherein: When the slot contains a right angle, first drill an inscribed circular hole with a diameter of 0.45-0.65mm at the right angle; When the slot contains a sharp corner, and the maximum width of the sharp corner d < 0.8 mm, an auxiliary hole with a diameter of 0.45-0.65 mm is drilled at the sharp corner, and the drilled auxiliary hole does not exceed the forming line; When the slot is a slot hole and the slot hole width is <2.54mm, drill an auxiliary hole with the same width as the slot hole at each end of the slot hole; when the slot hole is a slot hole and the slot hole length is >30mm, drill auxiliary holes in the slot and the spacing between the auxiliary holes is ≤30mm. When the distance between the slot hole inside the board and the forming line is relatively close, a buffer groove is drilled outside the forming line, and the length of the buffer groove is twice the diameter of the slot hole. When the distance n between the slot hole inside the board and the forming line is less than a set value, a buffer groove is drilled outside the forming line. The conditions for setting the buffer groove outside the forming line are as follows: ； When the slot is a groove and the groove width a < 4mm, and the groove width is less than half the groove length, an auxiliary hole is drilled at the end of the groove, and the diameter of the auxiliary hole = a - 0.25 ± 0.05mm; when the groove is located at the forming edge, an auxiliary hole with the same diameter as the groove width is drilled at the groove. When the slot is an elliptical slot and the slot length is less than 2.5 times the slot width, there is no need to drill auxiliary holes at both ends of the slot. The slot can be opened by direct drilling or punching directly out by die punch. When the distance a between the two slots is less than 4mm, a slot is made by drilling or a hole is drilled / slotted at the ends of the two slots, as follows: When the two slots are on the same horizontal line and the ends of the two slots are arc-shaped, and the distance a between the two slots is less than 4mm, auxiliary holes are drilled or auxiliary slots are opened at the ends of the two slots. The diameter of the auxiliary hole or the width of the auxiliary slot is equal to the width of the slot, and the center distance between the two auxiliary holes / auxiliary slots is ≥4mm. When two slots are set in parallel and the distance a between the two slots is less than 4mm, one of the slots is drilled. When the two slots are perpendicular and the distance between the two slots a < 4mm, an auxiliary slot is opened in one of the slots. The width of the auxiliary slot is equal to the width of the corresponding slot, and the length of the auxiliary slot is greater than the width of the other slot. When the two slots are annular and the maximum distance 'a' between the two slots satisfies 'a < 4 mm', a set of auxiliary holes are drilled on the outer side of the outer slot and the inner side of the inner slot, respectively, corresponding to the maximum distance between the two slots. The diameter of the auxiliary holes satisfies 0.45 ≤ diameter ≤ 1.0 mm. The lower limit of the distance between two adjacent auxiliary holes is the safe distance without a hole plug, and the upper limit is ≤ 0.5 mm. The distance between the two sets of auxiliary holes and the edge of the corresponding slot is 'b', 0.15 ≤ b ≤ 0.25 mm. When two slots are square slots distributed on the same horizontal line, and the distance between the two slots a < 4mm, and the distance between the inscribed circles at the right angle of the two slots d < 4mm, auxiliary slots e and c, which are perpendicular to each other, are drilled at the ends of the two slots. Auxiliary slot e is located inside the slot, and auxiliary slot c extends outside the slot. The width of auxiliary slot e is equal to 0.5 times the width of auxiliary slot c, and the distance between the two sides of the two auxiliary slots c with the largest distance is b ≥ 4mm. When the two slots are square slots distributed on the same horizontal line, and the distance between the two slots a < 4mm, and the distance between the inscribed circles at the right angle of the two inner slots d ≥ 4mm, the inscribed circles at the right angle and the auxiliary slot c are drilled at the ends of the two slots. The auxiliary slot c is perpendicular to the slot and extends to the outside of the slot. When two slots are distributed on the same horizontal line, and their ends contain a right angle and an arc segment, and the distance between the two slots a < 4mm, and the distance between the inscribed circles at the right angle of the two inner slots d ≥ 4mm, the inscribed circles at the right angle and the auxiliary slot c are drilled at the ends of the two slots. The length of the auxiliary slot c is equal to the width of the slot. Step S2: Perform die punching to punch out the corresponding slots.

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