Peel strength testing device for copper-clad plate

Abstract

The invention discloses a peel strength testing device for a copper-clad plate, and relates to the technical field of peel strength testing, the peel strength testing device comprises a base, the left end of the base is fixedly provided with a vertical guide rail; the clamping jaw is arranged in the vertical guide rail in a sliding manner; the lifting mechanism comprises a lifting screw rotationally arranged in the vertical guide rail and a driving motor connected to the upper end of the lifting screw, and the lifting screw is in threaded connection with the clamping jaw; the transverse guide rail is arranged on the base in a sliding mode and located under the clamping jaw. The pressing strips are arranged on the two sides of the transverse guide rail; the grinding roller is arranged at the right end of the base; the two cutting wheels are arranged on the base and correspond to the upper portion of the middle of the transverse guide rail. The device has the beneficial effects of being high in automation degree, high in adaptability and compact in structure.

Description

Technical Field

[0001] The invention relates to the technical field of peeling strength testing, in particular to a peeling strength testing device for a copper clad laminate. Background Art

[0002] Copper Clad Laminate (CCL) is an important component of printed circuit boards (PCBs). It is made of reinforced materials impregnated with resin, laminated with prepregs formed after high-temperature baking, and covered with copper foil on one or both sides, and then hot-pressed. Copper Clad Laminate is widely used in the manufacture of electronic products, especially in the production of multi-layer circuit boards. The peel strength of copper clad laminate refers to the strength of peeling between the copper clad layer and the substrate under certain conditions. The level of peel strength is directly related to the connection reliability and stability of the circuit board. Insufficient peel strength will lead to poor circuit connection and even circuit board failure. Therefore, the peel strength test of copper clad laminate is of great significance to ensure the quality of circuit boards.

[0003] The existing copper clad laminate peel strength test method is mainly achieved through tensile testing. The specific steps are as follows:

[0004] Prepare the sample: Cut the sample of the predetermined width on the copper clad laminate to be tested. This step usually requires manual operation, using a knife or laser cutting equipment for cutting.

[0005] Pre-treatment of the sample: In order to fix the sample on the test fixture, a part of the copper foil needs to be peeled off in advance for clamping. The process of peeling the copper foil also requires manual operation, and the peeling length is required to be moderate to ensure the accuracy of the peeling test.

[0006] Install the sample: Clamp the peeled copper foil part on the peeling fixture, and stick the substrate part of the sample on the rotating drum of the peeling fixture with double-sided tape. This step also relies on manual operation to ensure that the sample is firmly installed.

[0007] Conduct the test: Start the peel tester, peel off the copper foil at a certain rate, record the force and displacement data during the peeling process, and calculate the peel strength.

[0008] Although the existing copper clad laminate peel strength test method can evaluate the peeling performance of copper clad laminates to a certain extent, it still has many shortcomings:

[0009] From cutting the specimen to pre-processing and installing the specimen, the whole process requires a lot of manual work. This not only increases the labor intensity of the testers, but also may cause operational errors, affecting the accuracy of the test results. Manual operation is not only time-consuming, but also difficult to control the cutting depth, thus affecting the accuracy of the specimen. Inconsistent depth may cause uneven peeling force during the test, thus affecting the reliability of the test results.

[0010] During the peeling process, the verticality between the copper foil and the substrate is difficult to ensure. If the copper foil after peeling is not perpendicular to the substrate, the peeling force will be affected, resulting in a decrease in test accuracy.

[0011] Therefore, it is necessary to provide a peel strength testing device for a copper clad laminate to solve the problems raised in the above background technology. Summary of the invention

[0012] To achieve the above object, the present invention provides the following technical solution: a peel strength testing device for a copper clad laminate, comprising:

[0013] A base, a vertical guide rail being fixedly mounted on the left end of the base;

[0014] A clamping jaw, wherein the clamping jaw is slidably disposed in the vertical guide rail;

[0015] A lifting mechanism, comprising a lifting screw rotatably arranged in the vertical guide rail and a driving motor connected to the upper end of the lifting screw, wherein the lifting screw is threadedly connected to the clamping claw;

[0016] A transverse guide rail, the transverse guide rail is slidably disposed on the base and is located directly below the clamping claw;

[0017] A pressure strip, arranged on both sides of the transverse guide rail;

[0018] A grinding roller, arranged at the right end of the base;

[0019] Two cutting wheels are arranged on the base and correspond to the upper part of the middle part of the transverse guide rail.

[0020] Furthermore, a tension sensor is provided in the clamping jaw for measuring the tension when peeling the copper foil.

[0021] Furthermore, both ends of the grinding roller are respectively connected to a grinding bracket, the grinding bracket is fixed on the base, an arc groove is opened in the grinding bracket, the grinding roller is rotatably and slidably connected to the arc groove, and a grinding motor is arranged at one end of the grinding roller.

[0022] Furthermore, each of the cutting wheels is rotatably connected to a connecting block, and the two connecting blocks are slidably connected to the same rotating shaft. The rotating shaft is slidably and rotationally restrictedly connected to the cutting wheel, one end of the rotating shaft is connected to a cutting motor, and both ends of the rotating shaft are respectively connected to a cutting bracket.

[0023] Furthermore, a cutting slider is slidably arranged on each cutting bracket, a knob capable of adjusting the height of the cutting slider is arranged in the cutting bracket, and the rotating shaft is rotatably connected to the cutting slider.

[0024] Furthermore, a screw rod is rotatably arranged between the two cutting sliders, and the threads on both sides of the screw rod are rotated in opposite directions with the center as the boundary. The two cutting sliders are respectively threadedly connected to the threads at both ends of the screw rod, and a distance knob is arranged at one end of the screw rod.

[0025] Furthermore, a connecting rod is hinged on the top of each cutting bracket, and the other end of the connecting rod is hinged to a sliding shaft. The sliding shaft is slidably connected in the arc groove and rotatably connected to the grinding roller. A sliding groove is provided in the connecting rod, and the sliding groove is slidably connected to the cutting slider on the corresponding side.

[0026] Furthermore, a driven shaft perpendicular to the lifting screw is rotatably arranged at the lower end of the lifting screw, and a gear is fixed in the driven shaft;

[0027] A rack is fixed at the bottom of the transverse guide rail, and the rack is meshed with the gear.

[0028] Furthermore, a top block is rotatably provided at the middle part of the right end of the transverse guide rail, and a torsion spring is provided between the top block and the transverse guide rail, and the torsion spring makes the top block tilt downward in a natural state.

[0029] Furthermore, a guide rod is fixed below the top block, and a baffle is fixed on the left end of the base, and the baffle is at the height of the guide rod.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The present invention integrates multiple steps such as grinding, cutting, clamping and peeling, and realizes a high degree of automation of the test process through motor drive and mechanical linkage. The operator only needs to perform simple parameter settings and start operations to complete the entire test process, which greatly reduces the difficulty of operation and time cost.

[0032] The present invention can adapt to the testing requirements of copper-clad laminates of different thicknesses and specifications by adjusting the height, spacing and other parameters of the grinding roller and the cutting wheel, ensuring that the grinding roller only removes part of the substrate without damaging the copper foil, and the cutting wheel only cuts the copper foil without cutting the substrate.

[0033] The meshing design of the gear and the rack in the present invention ensures that the copper foil and the substrate are always kept perpendicular during the peeling test of the clamping jaws, thereby avoiding the influence of the bending of the copper foil on the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of a peel strength testing device for a copper clad laminate;

[0035] Figure 2 It is a three-dimensional structural schematic diagram of the position of the transverse guide rail in the present invention;

[0036] Figure 3 It is a schematic diagram of the side structure of the transverse guide rail in the present invention;

[0037] Figure 4 Schematic diagram of the internal structure of the transverse guide rail in the present invention;

[0038] Figure 5 It is a schematic diagram of the structure when the horizontal guide rail slides to the left in the present invention;

[0039] Figure 6 It is a schematic diagram of the structure when the transverse guide rail slides to the right in the present invention;

[0040] In the figure: 1. base; 2. vertical guide rail; 21. lifting screw; 22. driving motor; 23. driven shaft; 24. gear; 3. clamping claw; 4. horizontal guide rail; 41. rack; 5. pressure strip; 6. grinding roller; 61. grinding bracket; 62. arc groove; 63. sliding shaft; 64. grinding motor; 7. cutting wheel; 71. connecting block; 72. cutting slider; 73. cutting bracket; 74. height knob; 75. rotating shaft; 76. cutting motor; 77. screw; 78. distance knob; 8. top block; 81. guide rod; 82. baffle; 9. connecting rod; 91. slide groove. DETAILED DESCRIPTION

[0041] See also Figure 1-Figure 6 In an embodiment of the present invention, a peel strength testing device for a copper clad laminate includes:

[0042] A base 1, a vertical guide rail 2 is fixedly mounted on the left end of the base 1;

[0043] A clamping jaw 3, wherein the clamping jaw 3 is slidably disposed in the vertical guide rail 2 and is used for clamping a copper foil portion to be tested;

[0044] The lifting mechanism includes a lifting screw 21 rotatably arranged in the vertical guide rail 2 and a driving motor 22 connected to the upper end of the lifting screw 21, wherein the lifting screw 21 is threadedly connected to the clamping jaw 3 to drive the clamping jaw 3 to move up and down along the vertical guide rail 2;

[0045] A transverse guide rail 4, which is slidably disposed on the base 1 and is located directly below the clamping jaw 3, and is used to support the copper clad laminate;

[0046] The pressure strips 5 are arranged on both sides of the transverse guide rail 4 and are used to press the two sides of the copper clad board placed on the transverse guide rail 4;

[0047] A grinding roller 6 is provided at the right end of the base 1 and is used to grind off the portion of the copper-clad plate extending out of the right end of the horizontal guide rail 4, while retaining the copper foil;

[0048] Two cutting wheels 7 are arranged on the base 1 and above the middle of the horizontal guide rail 4, and are used to cut copper foil of a predetermined width on the surface of the copper clad laminate.

[0049] In this embodiment, a tension sensor is provided in the clamping jaw 3 for measuring the tension when peeling the copper foil.

[0050] Among them, the distance between the cutting wheel 7 and the grinding roller 6 is greater than the length of a copper clad laminate. When the copper clad laminate is placed on the transverse guide rail 4 and one side thereof extends out of the right end of the transverse guide rail 4, after being pressed by the pressure strip 5, the grinding roller 6 grinds off the substrate portion extending from the copper clad laminate from the bottom, and then the transverse guide rail 4 slides to the left, so that the two cutting wheels 7 cut copper foil of a predetermined width on the copper clad laminate until the right end of the transverse guide rail 4 moves to directly below the clamp 3. At this time, the clamp 3 clamps the cut copper foil and slides upward under the drive of the lifting mechanism to realize the peeling of the copper foil from the substrate. At the same time, the tension sensor measures and records the tension during the peeling process.

[0051] See also Figure 2 and Figure 3 In this embodiment, both ends of the grinding roller 6 are connected to a grinding bracket 61 respectively, and the grinding bracket 61 is fixed on the base 1. An arc groove 62 is opened in the grinding bracket 61, and the grinding roller 6 is rotatably and slidably connected to the arc groove 62. A grinding motor 64 is arranged at one end of the grinding roller 6.

[0052] The height of the grinding roller 6 can be adjusted by changing the position of the grinding roller 6 in the arc groove 62 , so as to adapt to the grinding of copper clad laminate substrates of different thicknesses.

[0053] In this embodiment, each of the cutting wheels 7 is rotatably connected to a connecting block 71, and the two connecting blocks 71 are slidably connected to the same rotating shaft 75. The rotating shaft 75 is slidably connected to the cutting wheel 7 and has limited rotation. One end of the rotating shaft 75 is connected to a cutting motor 76, and both ends of the rotating shaft 75 are respectively connected to a cutting bracket 73.

[0054] The distance between the two cutting wheels 7 can be changed by the sliding connection block 71 , thereby adjusting the width of the copper foil cut on the copper-clad laminate, and the two cutting wheels 7 can be driven to rotate synchronously by the cutting motor 76 .

[0055] In this embodiment, a cutting slider 72 is slidably provided on each cutting bracket 73 , a height knob 74 capable of adjusting the cutting slider 72 is provided in the cutting bracket 73 , and the rotating shaft 75 is rotatably connected to the cutting slider 72 .

[0056] The height of the cutting wheel 7 can be adjusted by turning the height knob 74 to adapt to copper-clad laminates of different thicknesses, ensuring that the cutting wheel 7 only cuts the copper foil on the surface of the copper-clad laminate but not the substrate.

[0057] In this embodiment, a screw rod 77 is rotatably arranged between the two cutting sliders 72, and the threads of the screw rod 77 on both sides of the center are rotated in opposite directions. The two cutting sliders 72 are respectively threadedly connected to the threads at both ends of the screw rod 77, and a distance knob 78 is arranged at one end of the screw rod 77.

[0058] By rotating the distance knob 78 to rotate the lead screw 77 , the distance between the two cutting slide blocks 72 can be adjusted, and the copper foil cut by the two cutting wheels 7 can be ensured to be in the center of the transverse guide rail 4 .

[0059] In this embodiment, a connecting rod 9 is hinged on the top of each cutting bracket 73, and the other end of the connecting rod 9 is hinged to a sliding shaft 63. The sliding shaft 63 is slidably connected in the arc groove 62 and rotatably connected to the grinding roller 6. A sliding groove 91 is opened in the connecting rod 9, and the sliding groove 91 is slidably connected to the cutting slider 72 on the corresponding side.

[0060] That is to say, when the height of the cutting slider 72 changes, it will drive the linkage rod 9 to rotate, so that the height of the grinding roller 6 will also change accordingly, so that copper-clad laminates of different thicknesses can be ground off one side of the substrate by the grinding roller 6, and can also be cut by the cutting wheel 7 to cut the copper foil without cutting the substrate.

[0061] See also Figure 4 In this embodiment, a driven shaft 23 is rotatably provided at the lower end of the lifting screw 21 and is perpendicular to the driven shaft 23, and a gear 24 is fixed in the driven shaft 23;

[0062] A rack 41 is fixed to the bottom of the transverse guide rail 4 , and the rack 41 is meshed with the gear 24 .

[0063] When the lifting screw 21 rotates to lower the clamping jaw 3, the gear 24 and the rack 41 will drive the horizontal guide rail 4 to slide to the left. The same is true in reverse. The sliding speed of the clamping jaw 3 is the same as the sliding speed of the horizontal guide rail 4. When the clamping jaw 3 clamps the copper foil for peeling test, the copper foil and the substrate are always kept perpendicular to avoid the copper foil bending at different angles to affect the test results.

[0064] In this embodiment, a top block 8 is rotatably provided at the middle of the right end of the transverse guide rail 4 , and a torsion spring is provided between the top block 8 and the transverse guide rail 4 , and the torsion spring makes the top block 8 tilt downward in a natural state.

[0065] In this embodiment, a guide rod 81 is fixed below the top block 8 , and a baffle 82 is fixed on the left end of the base 1 , and the baffle 82 is at the height of the guide rod 81 .

[0066] That is to say, when the transverse guide rail 4 is located at the right end of the base 1, the top block 8 is in a downward tilted state under the action of the torsion spring to avoid obstruction of the grinding roller 6, and when the transverse guide rail 4 slides to the left end of the base 1, the guide rod 81 will hit the baffle 82, so that the top block 8 overcomes the elastic force of the torsion spring and rotates upward, so that the copper foil of the copper-clad laminate whose substrate is ground off by the grinding roller 6 and whose portion of the copper foil cut out of a predetermined width by the cutting wheel 7 is lifted up by the top block 8, so that the clamp 3 can clamp this portion of the copper foil for subsequent peeling test.

[0067] In specific implementation: adjust the distance knob 78 to set the distance between the two cutting wheels 7 to ensure that the copper foil of a predetermined width can be cut on the copper clad laminate;

[0068] According to the thickness of the copper-clad laminate to be tested, the height knob 74 is adjusted to set the height of the cutting wheel 7, ensuring that the cutting wheel 7 only cuts the copper foil on the surface of the copper-clad laminate without cutting the substrate. At the same time, the grinding roller 6 is also adjusted synchronously under the action of the linkage rod 9 to ensure that the substrate can be removed without damaging the copper foil during grinding.

[0069] In the initial state, the horizontal guide rail 4 is at the right end of the base 1. The copper clad laminate to be tested is placed flat on the horizontal guide rail 4, ensuring that one end of the copper clad laminate extends out of the right end of the horizontal guide rail 4. The two sides of the copper clad laminate are pressed tightly by the pressure strip 5 to prevent it from moving during grinding and cutting.

[0070] Start the grinding motor 64 to rotate the grinding roller 6 and start grinding the portion of the substrate extending out of the right end of the copper-clad plate 4; after the grinding is completed, turn off the grinding motor 64;

[0071] Start the cutting motor 76 to make the two cutting wheels 7 rotate synchronously, start the driving motor 22 to make the lifting screw 21 rotate, then the horizontal guide rail 4 slides to the left, and the cutting wheel 7 cuts the copper foil of a predetermined width on the copper clad laminate. After the cutting is completed, turn off the cutting motor 76;

[0072] When the horizontal guide rail 4 slides to the left end of the base 1, the guide rod 81 hits the baffle 82, so that the top block 8 overcomes the elastic force of the torsion spring and rotates upward, completing the lifting action of the copper foil;

[0073] When the horizontal guide rail 4 slides to the left end of the base 1, the clamping jaw 3 descends and clamps the cut and lifted copper foil part;

[0074] The driving motor 22 rotates in the reverse direction, and the clamping jaw 3 rises, and the horizontal guide rail 4 slides to the right, so that the copper foil cut to a predetermined width is peeled off from the substrate. During the peeling process, the tension sensor measures and records the peeling tension in real time;

[0075] After the peeling is completed, the peeling tensile force data is read from the tensile force sensor, and the peeling strength performance of the copper clad laminate is evaluated by analyzing the data.

[0076] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A peel strength testing device for a copper clad laminate, characterized in that: include: A base (1), wherein a vertical guide rail (2) is fixedly mounted on the left end of the base (1); A clamping claw (3), the clamping claw (3) being slidably disposed in the vertical guide rail (2); A lifting mechanism, comprising a lifting screw (21) rotatably arranged in the vertical guide rail (2) and a driving motor (22) connected to the upper end of the lifting screw (21), wherein the lifting screw (21) is threadedly connected to the clamping claw (3); A transverse guide rail (4), the transverse guide rail (4) being slidably disposed on the base (1) and being located directly below the clamping claw (3); Pressure strips (5) are arranged on both sides of the transverse guide rail (4); A grinding roller (6) is arranged at the right end of the base (1); Two cutting wheels (7) are arranged on the base (1) and correspond to the upper part of the middle part of the transverse guide rail (4).

2. The peel strength testing device for a copper clad laminate according to claim 1, characterized in that: The clamping jaw (3) is provided with a tension sensor for measuring the tension when peeling off the copper foil.

3. The peel strength testing device for a copper clad laminate according to claim 1, characterized in that: Both ends of the grinding roller (6) are connected to a grinding bracket (61), the grinding bracket (61) is fixed on the base (1), an arc groove (62) is provided in the grinding bracket (61), the grinding roller (6) is rotatably and slidably connected to the arc groove (62), and a grinding motor (64) is provided at one end of the grinding roller (6).

4. The peel strength testing device for a copper clad laminate according to claim 3, characterized in that: Each of the cutting wheels (7) is rotatably connected to a connecting block (71), and the two connecting blocks (71) are slidably connected to the same rotating shaft (75). The rotating shaft (75) is slidably connected to the cutting wheel (7) and is rotationally restricted. One end of the rotating shaft (75) is connected to a cutting motor (76), and both ends of the rotating shaft (75) are respectively connected to a cutting bracket (73).

5. The peel strength testing device for a copper clad laminate according to claim 4, characterized in that: A cutting slider (72) is slidably disposed on each cutting bracket (73), a knob (74) capable of adjusting the height of the cutting slider (72) is disposed in the cutting bracket (73), and the rotating shaft (75) is rotatably connected to the cutting slider (72).

6. The peel strength testing device for a copper clad laminate according to claim 5, characterized in that: A screw rod (77) is rotatably arranged between the two cutting sliders (72), and the threads of the screw rod (77) on both sides of the center are rotated in opposite directions. The two cutting sliders (72) are respectively threadedly connected to the threads at both ends of the screw rod (77), and a distance knob (78) is arranged at one end of the screw rod (77).

7. The peel strength testing device for a copper clad laminate according to claim 6, characterized in that: A connecting rod (9) is hinged on the top of each cutting bracket (73), and the other end of the connecting rod (9) is hinged to a sliding shaft (63). The sliding shaft (63) is slidably connected in the arc groove (62) and rotatably connected to the grinding roller (6). A sliding groove (91) is provided in the connecting rod (9), and the sliding groove (91) is slidably connected to the cutting slider (72) on the corresponding side.

8. The peel strength testing device for a copper clad laminate according to claim 1, characterized in that: A driven shaft (23) is rotatably disposed at the lower end of the lifting screw (21) and is perpendicular thereto, and a gear (24) is fixed in the driven shaft (23); A rack (41) is fixed to the bottom of the transverse guide rail (4), and the rack (41) is meshed with the gear (24).

9. The peel strength testing device for a copper clad laminate according to claim 1, characterized in that: A top block (8) is rotatably arranged at the middle of the right end of the transverse guide rail (4), and a torsion spring is arranged between the top block (8) and the transverse guide rail (4), wherein the torsion spring causes the top block (8) to tilt downward in a natural state.

10. The peel strength testing device for copper clad laminate according to claim 9, characterized in that: A guide rod (81) is fixed below the top block (8), and a baffle (82) is fixed on the left end of the base (1), wherein the baffle (82) is at the height of the guide rod (81).

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