Positioning and pressing jig and method for dispensing and bonding of 3C product shell

Abstract

The application provides a positioning and pressing jig and method for dispensing and bonding of 3C product shells, and belongs to the field of 3C product shell production. The jig comprises a base, a positioning assembly, a blocking piece, a pressing jaw assembly, a guide mechanism, a first driving piece and a second driving piece. The positioning assembly has a workpiece position for accommodating and positioning the shell. The blocking piece is arranged on one side of the workpiece position along a second direction. The pressing jaw assembly comprises a pressing jaw fixing plate and a pressing jaw. The pressing jaw fixing plate is slidably connected to the base along the second direction through the guide mechanism. The first driving piece drives the pressing jaw assembly to move along a first direction intersecting the second direction to press the shell. The second driving piece drives the pressing jaw assembly to translate along the second direction. The pressing jaw assembly can translate along the second direction under the driving of the second driving piece while the pressing jaw keeps pressing the shell, so that the shell is pushed against the blocking piece, the positioning process is not out of constraint, the positioning accuracy of the shell is high, and the dispensing and bonding process requirements are met.

Description

Technical Field

[0001] This invention belongs to the field of 3C product casing manufacturing, and specifically relates to a positioning and pressing fixture and method for dispensing and bonding 3C product casings. Background Technology

[0002] As consumer electronics products trend towards thinner, lighter designs and narrower bezels, 3C product casings (such as laptop C-shells and tablet mid-frames) are increasingly adopting composite structures that bond aluminum sheets to plastic parts. These casings typically have a wall thickness between 0.3 and 0.6 mm, resulting in limited rigidity and making them prone to warping during handling and stacking. The adhesive bonding process requires reliably positioning, flattening, and pressing the casing against a reference surface before bonding to ensure accurate dispensing path and proper adhesion of the bonding surfaces.

[0003] Existing positioning and pressing fixtures typically use the following methods to fix the workpiece: (1) Passive limiting of the molded cavity. The shell is placed into the molded cavity that matches the shape, and the shell is blocked by the cavity wall. This method has high requirements for the consistency of the incoming material size; when the shell is warped, the edge of the shell cannot be completely against the cavity wall, resulting in uncertainty in the horizontal positioning and offset of the dispensing path.

[0004] (2) There is disagreement in existing technologies regarding whether to use vacuum adsorption. Some solutions use suction cups at the bottom of the molding cavity to adsorb and adhere the shell using negative pressure. However, for shells with warpage exceeding the compensation capacity of the sealing surface, local air leakage leads to adsorption failure. Other solutions believe that vacuum adsorption will cause local deformation of thin-walled parts and explicitly choose not to use vacuum adsorption, relying solely on mechanical clamps or claws for pressing. When dealing with warped shells, the latter solution lacks pre-flattening methods before pressing, causing the shell to elastically warp up the moment the claws press down, resulting in uneven distribution of pressing force and exacerbating positioning uncertainty.

[0005] The two approaches described above each have their own advantages and disadvantages: the former relies on adsorption but is limited by sealing conditions, while the latter abandons adsorption but lacks a pre-leveling step. Neither approach utilizes "adsorption tightening" and "mechanical pressing" as a sequential and synergistic method.

[0006] (3) The relationship between pressing and horizontal pushing actions. In existing solutions, Z-axis pressing and X / Y-axis horizontal pushing are usually performed as two independent actions: first pressing down to fix, then releasing and then pushing laterally; or first pushing laterally into place, then pressing down to lock. There is a brief unconstrained state of the shell between the two actions. For thin-walled shells with a wall thickness of 0.3 to 0.6 mm and a warpage of up to 0.3 mm, this gap is sufficient to allow the shell to undergo micro-displacement. In existing published literature, there is no fixture structure that simultaneously performs horizontal pushing while maintaining the pressing state.

[0007] (4) Dispensing positioning depends on the accuracy of the incoming product. Some solutions do not set an independent calibration benchmark for the dispensing needle, and the starting coordinates of the dispensing path are directly referenced to the edge of the housing. When the dimensions of the incoming housing fluctuate, the dispensing position fluctuates accordingly, requiring individual adjustments or additional manual visual inspection, which affects cycle time and consistency.

[0008] In summary, it can be seen that in the existing adhesive bonding process for 3C product casings, thin-walled casings (wall thickness 0.3–0.6 mm) are prone to warping due to insufficient rigidity, and the following technical difficulties exist in the positioning and pressing stage: (1) Vacuum adsorption and mechanical pressing are considered mutually exclusive methods. The vacuum adsorption method is limited by the adsorption failure when the warpage of the shell exceeds the sealing compensation capacity; the method without vacuum adsorption lacks the pre-flattening step before pressing, and the shell elastically warps up when the press claw is pressed down, resulting in uneven distribution of pressing force. Neither method utilizes adsorption tightening and mechanical pressing as a sequential and synergistic means.

[0009] (2) Pressing and horizontal pushing are performed in separate steps, resulting in a gap due to lack of constraint. In the existing solution, pressing in the Z direction and pushing in the horizontal direction are performed as two independent actions. The shell loses constraint briefly between the action switching, and the thin-walled shell undergoes micro-displacement within this gap, resulting in a deviation in the final bonding position.

[0010] (3) The dispensing positioning accuracy is affected by the fluctuation of the incoming material size. Some solutions use the edge of the shell as the dispensing coordinate reference. The fluctuation of the incoming material size directly translates into dispensing path offset, which requires individual adjustments and affects cycle time and consistency.

[0011] The combination of these problems makes it difficult to maintain a high level of yield for adhesive bonding of thin-walled 3C product casings. Summary of the Invention

[0012] In view of the above situation, the main objective of the present invention is to provide a positioning and pressing fixture and method for dispensing and bonding the casing of 3C products, so as to solve the above-mentioned technical problems.

[0013] This invention proposes a positioning and pressing fixture for dispensing and bonding 3C product housings, comprising: Base; A positioning component, located on the base, has a workpiece position for accommodating and positioning the housing of a 3C product; A stop is provided on one side of the workpiece position along the second direction; A pressure claw assembly includes a pressure claw fixing plate and pressure claws disposed on the pressure claw fixing plate; A guide mechanism is provided between the pressure claw fixing plate and the base, and the pressure claw fixing plate is slidably connected to the base in the second direction via the guide mechanism; A first driving member is used to drive the pressure gripper assembly to move toward the workpiece position along a first direction to press against the housing located at the workpiece position; the first direction intersects with a second direction; and The second driving component is used to drive the pressure claw assembly to translate relative to the base along the second direction; The pressure claw assembly is configured such that, while the pressure claw is holding the housing in a pressing state, it can translate along a second direction under the drive of a second drive member, so that the pressure claw pushes the housing against the stop member.

[0014] This invention also proposes a positioning and pressing method for adhesive bonding of 3C product housings, using the aforementioned positioning and pressing fixture for adhesive bonding of 3C product housings, comprising the following steps: S1. Place the housing at the workpiece position, and use the stop to block and limit the housing along the second direction; S2. Control the adsorption component of the vacuum adsorption assembly to tighten the housing along the first direction; S3. The first driving component drives the pressure claw assembly to move in the first direction, so that the pressure claw presses against the housing; S4. The second driving member drives the pressure claw assembly to translate along the second direction while the pressure claw is in the clamping state, so that the pressure claw pushes the housing against the stop member; S5. Apply adhesive and bond the clamped housing. After the operation is completed, remove the vacuum and reset the pressure claw assembly.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) Pressing and pushing in one step, eliminating the gap of unconstrained clearance. The pressure claw assembly is slidably connected to the base along the second direction through the guide mechanism. The first driving member drives it to press down, and the second driving member drives it to translate along the second direction while maintaining the pressed state. Since the pressure claw always applies normal pressure to the shell during the entire pushing process, there is no unconstrained state of the shell during the transition from "flattening" to "pushing", avoiding the micro displacement of the thin-walled shell due to brief release. Compared with the existing technology where pressing and pushing are performed in steps and the shell is briefly unconstrained between actions, this structure combines the two originally separate processes into a continuous action, reducing the cumulative error between processes and eliminating the possibility of micro displacement of the thin-walled shell in the gap.

[0016] (2) Vacuum tightening provides pre-flattening conditions for pressing. Before the pressure claws press down, the vacuum adsorption assembly first holds and tightens the housing, initially flattening the warped housing to fit the bottom surface of the contour positioning cavity. This step ensures that the housing is in a nearly flat state when the pressure claws press down, and the force on each point of the pressure claws tends to be uniform, avoiding concentrated pressing force or incomplete pressing caused by local warping. For housings with warping within the range of suction cup sealing compensation, vacuum tightening can meet the flatness requirements; for housings with larger warping, although vacuum tightening cannot completely eliminate warping, it can constrain it within the range that the pressure claw stroke can compensate for, and the two form a progressive cooperation rather than a simple superposition.

[0017] (3) Cooperative constraint of contour positioning cavity and multi-directional limiting. The contour positioning cavity on the support plate provides Z-axis support and preliminary constraint on the outer contour; the limiting components provide stop and limit in the second and third directions respectively; the stop components provide a definite stopping reference for lateral thrust. The above constraints restrict the shell in all six degrees of freedom, and the lateral thrust stroke is uniquely determined by the position of the stop components, independent of the shell material dimensions. (4) The calibration reference decouples the dispensing accuracy from the incoming material size. The calibration reference set on the support plate provides the external dispensing needle with a positional reference independent of the housing. The dispensing path establishes a coordinate system with the calibration reference as the origin. The slight positional fluctuation of the housing in the molding cavity does not affect the dispensing starting coordinate, reducing the need for piece-by-piece debugging due to fluctuations in the incoming material size.

[0018] (5) The double-layer layout facilitates integration and maintenance. The first drive component, the second drive component, and the guide mechanism are located in the accommodating space between the support plate and the base, while the pressure claw and the contouring cavity are located on the upper layer. This layout lowers the center of gravity of the drive mechanism and makes the overall structure compact. At the same time, the upper operating surface is open, which facilitates the removal and placement of the housing and the cleaning and maintenance of the suction cup. In case of a failure of the drive mechanism, it can be repaired separately from the lower layer without affecting the positioning components on the upper layer.

[0019] (6) Actual measured data. In the dispensing and bonding process of aluminum C-shell of laptop computers (wall thickness about 0.4 mm, warpage ≤ 0.3 mm), after 6 days of continuous production using the fixture of this solution, the bonding yield increased from about 82% when using the original fixture to about 97%. The improvement in yield mainly comes from the reduction of positioning misalignment defects and poor bonding surface fit, which is consistent with the effect of the three technical features mentioned above: "pressure and push integration to eliminate gaps", "vacuum pre-leveling" and "multi-directional limiting".

[0020] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by means of embodiments of the invention. Attached Figure Description

[0021] Figure 1 This is a three-dimensional assembly view of the positioning and pressing fixture for dispensing adhesive bonding of 3C product shells proposed in this invention. Figure 2 This is a top view of the positioning and pressing fixture for dispensing adhesive bonding of 3C product housings proposed in this invention; Figure 3 This is a cross-sectional view of the positioning and pressing fixture for dispensing adhesive bonding of 3C product housings proposed in this invention; Figure 4 This is a perspective view of the positioning and pressing fixture for dispensing adhesive bonding of 3C product housings proposed in this invention. Figure 5 This is a partially enlarged view of the pressure claw of the positioning and pressing fixture for dispensing adhesive bonding of 3C product shells proposed in this invention; Figure 6 Summary chart of product yield for improved jigs; Figure 7 Summary chart for improving the yield of post-fixture products; In the diagram: 10. Base; 12. Support column mounting hole; 13. Key opening; 14. Hand grip; 21. Support column; 22. Support plate; 24. Calibration reference component; 221. Contouring positioning cavity; 30. Guide fixing plate; 31. Claw fixing plate; 32. Claw; 321. Holding part; 322. Clearing part; 323. Holding step; 41. Slide rail; 42. Slider; 43. Connecting plate; 50. First driving component; 60. Second driving component; 71. Vacuum generating component; 73. Adsorption component; 821. First limiting block; 822. Second limiting block; 91. Stop component; 101. Vacuum switch; 102. Lifting switch; 103. Side push switch. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0023] These and other aspects of the embodiments of the present invention will become clear from the following description and accompanying drawings. In these descriptions and drawings, some specific embodiments of the present invention are specifically disclosed to illustrate some ways of implementing the principles of the embodiments of the present invention; however, it should be understood that the scope of the embodiments of the present invention is not limited thereto.

[0024] Example 1: Overall structure of the jig; Reference Figures 1 to 5 (See the partial shape of the pressure claws pressing the keyboard frame.) Figure 5This embodiment provides a positioning and pressing fixture for adhesive bonding of 3C product shells. This fixture is used to position, press, and push the aluminum C-shell of a laptop computer (hereinafter referred to as "shell") to meet the positioning accuracy requirements of subsequent adhesive bonding processes. The shell has a wall thickness of approximately 0.4 mm, an incoming material warpage of ≤0.3 mm, and overall dimensions of approximately 320 mm × 220 mm. The shell has a keyboard frame with key openings 13 distributed in the keyboard frame area. The frame ribs around the key openings 13 are areas prone to warping and delamination.

[0025] The fixture includes a base 10, a positioning component, a pressure claw component, a guide mechanism, a first drive component 50, a second drive component 60, a vacuum adsorption component, a limiting component, a stop component 91, and a control component.

[0026] 1. Base; The base 10 is the basic supporting component of the fixture, and is rectangular in shape, preferably made of aluminum alloy. The bottom surface of the base 10 is provided with leveling feet for leveling and fixing the fixture to the workbench. The central area of ​​the top surface of the base 10 is the drive mechanism mounting area for mounting the first drive component 50, the second drive component 60, and the guide mechanism. Four support column mounting holes 12 are provided at the four corners of the top surface for mounting the support columns of the positioning components. A side-push mounting seat is provided on one side of the base 10 along the second direction (X direction), through which the second drive component 60 is fixed to the base 10.

[0027] The base 10 has a recessed hand grip 14 on each of its two adjacent sides. The hand grip 14 is a recessed groove, the size of which is suitable for the operator's hand to reach in so that the operator can take or put the shell through the hand grip 14.

[0028] 2. Positioning components; The positioning component includes four support columns 21 and a support plate 22.

[0029] Support column 21: Four support columns 21 are vertically installed in the four support column mounting holes 12 on the top surface of the base 10. They are made of rigid materials such as steel. The lower end is connected to the base 10 and the upper end is connected to the support plate 22, which horizontally supports the support plate 22 above the base 10. A receiving space is formed between the support plate 22 and the base 10. In this embodiment, the height is about 80 mm.

[0030] Support plate 22: The support plate 22 is a rectangular plate, preferably an aluminum alloy plate. A contoured positioning cavity 221 is provided in the central area of ​​the top surface of the support plate 22. The contour of the contoured positioning cavity 221 matches the shape of the outer edge of the shell. In this embodiment, the cavity depth is 2 mm, used to accommodate and support the shell. The bottom surface of the contoured positioning cavity 221 is the Z-direction support surface of the shell. This support surface has a support area in the keyboard frame area corresponding to the bottom surface of the keyboard frame, so that the keyboard frame obtains back-side support when the pressure claw 32 presses down. The bottom surface of the contoured positioning cavity 221 is also provided with multiple adsorption elements 73, the specific structure and layout of which are described in the vacuum adsorption assembly section below.

[0031] 3. Stopper 91; The stop 91 is a stop block located on one side of the support plate 22 along the second direction. It is made of elastic engineering plastics such as polyoxymethylene (POM) and is L-shaped. It is fixed to the mounting surface of the stop 91 on the support plate 22 by screws. The stop surface of the stop 91 faces the contour positioning cavity 221. The distance between its stop surface and the corresponding inner wall of the contour positioning cavity 221 is equal to the design external dimension of the shell (along the second direction). That is, when the shell is pushed against the stop 91, its edge is flush with the corresponding inner wall of the contour positioning cavity 221. The stop 91, made of elastic engineering plastic, provides a cushioning effect when the shell is pushed against, preventing indentations on the shell edges.

[0032] In this embodiment, the position of the stop member 91 along the second direction can be finely adjusted by sliding its mounting screw in the elongated slot, with an adjustment range of ±0.5 mm, and then locked. This adjustment is used to compensate for the nominal dimensional tolerances of different batches of housings.

[0033] 4. Claw assembly; The pressure claw assembly includes a guide fixing plate 30, a pressure claw fixing plate 31, and a plurality of pressure claws 32 mounted on the pressure claw fixing plate 31.

[0034] Guide fixing plate 30: The guide fixing plate 30 is a rectangular plate, preferably a high-rigidity steel plate or an aluminum alloy plate, located between the support plate 22 and the pressure claw fixing plate 31, and arranged parallel to both. The guide fixing plate 30 is slidably connected to the base 10 in the second direction via a guide mechanism. The bottom surface of the guide fixing plate 30 faces the base 10, and the top surface faces the pressure claw fixing plate 31, and is used to install the first driving member 50.

[0035] Pressure claw fixing plate 31: Pressure claw fixing plate 31 is a rectangular plate, preferably a high-rigidity aluminum alloy plate, located above guide fixing plate 30 and parallel to guide fixing plate 30. Pressure claw fixing plate 31 is slidably connected to guide fixing plate 30 along the first direction (Z direction) via four guide optical shafts and linear bearings, and is not directly connected to the guide mechanism. The bottom surface of pressure claw fixing plate 31 faces guide fixing plate 30, and the top surface is used to install pressure claw 32.

[0036] Pressure claws 32: In this embodiment, a total of twenty-one pressure claws 32 are provided, which are evenly distributed on the bottom surface of the pressure claw fixing plate 31 according to the high warping areas such as the keyboard frame. The number and arrangement of pressure claws 32 are not limited to this, and the principle is to distribute them evenly and to prevent the shell and keyboard frame from warping under the pressure state.

[0037] Each pressure claw 32 is L-shaped and includes a fixing part and a holding part 321. The fixing part is fixed to the bottom surface of the pressure claw fixing plate 31 by screws. The holding part 321 includes a clearance part 322 and a holding step 323. The clearance part 322 spans above the key opening 13 area, and its bottom surface is higher than the holding surface. The height difference between the two is the clearance height, which is 1.5 mm in this embodiment. This ensures that the clearance part 322 does not contact the edge of the key opening 13 when it is pressed, thus avoiding stress concentration and appearance damage. The holding step 323 extends downward from the end of the clearance part 322 toward the keyboard frame rib side, and its bottom surface forms the holding surface. The holding surface is a small contact area (approximately 6 mm × 4 mm in this embodiment), and an elastic pad such as polyurethane (PU) is attached to the surface. In this embodiment, the thickness is 0.5 mm. When the pressing surface of the pressing step 323 is in the pressed state, the distance between it and the keyboard frame support area on the bottom surface of the contour positioning cavity 221 is equal to the shell thickness plus the keyboard frame protrusion height plus the compression allowance of the elastic pad (approximately 0.1 mm), so that the pressing step 323 is precisely pressed against the top surface of the keyboard frame rib. Thus, the pressing claw 32 applies a local pressing force to the keyboard frame rib in the Z direction, forming a clamping pair with the support area on the bottom surface of the contour positioning cavity 221, which is used to suppress deformation, delamination, and glue overflow of the keyboard frame during the dispensing and pressure holding process.

[0038] In this embodiment, the pressure claw 32 is an integral stepped shape, milled from a single piece of aluminum alloy, with good structural rigidity and no assembly gap; in another embodiment, the pressure step 323 can also be fixed to the relief part 322 by screws to form a separate assembly, which is convenient for individual replacement after wear.

[0039] The pressing stroke of the pressure claw 32 (i.e., the Z-direction displacement of the pressure claw fixing plate 31 from the highest position to the lowest position) is 5 mm, of which the effective pressing stroke is 2 mm (i.e. the displacement of the pressure claw fixing plate 31 corresponding to the elastic pad from the free state to the compression of 0.1 mm), and the remaining 3 mm is the idle stroke, which is used to avoid the high point of the housing warping.

[0040] 5. Guiding mechanism; The guiding mechanism includes two slide rails 41 and four sliders 42.

[0041] Two slide rails 41 are arranged parallel to each other along the second direction (X direction) and fixed to the top surface of the base 10, located inside the support column 21; the slide rails 41 are preferably linear guide rails. Four sliders 42 are divided into two groups, with two sliders 42 in each group mounted on one slide rail 41 and fixedly connected to the bottom surface of the guide fixing plate 30 via a connecting plate 43. The sliders 42 can slide freely along the slide rails 41 in the second direction, with a sliding stroke of 50 mm. This sliding stroke is the pushing stroke of the guide fixing plate 30 and the pressure claw assembly above it in the second direction.

[0042] The guide mechanism allows the guide plate 30 (and its pressure claw plate 31, pressure claw 32, and first drive member 50) to move as a whole relative to the base 10 in the second direction, while the pressure claw plate 31 is independently driven to rise and fall in the first direction (Z direction) by the first drive member 50. The movements in the two directions do not interfere with each other.

[0043] In this embodiment, each end of the slide rail 41 is provided with a limit buffer to limit the end of the stroke of the slider 42 and absorb the impact, so as to prevent the guide fixing plate 30 and the pressure claw assembly from having a rigid collision at the end of the push stroke.

[0044] 6. First driving component; The first driving component 50 is a Z-direction cylinder, used to drive the pressure claw assembly to move along the first direction (Z direction, vertical direction) toward the workpiece position to press the housing.

[0045] In this embodiment, the first driving component 50 employs two double-acting cylinders, respectively installed on both sides of the guide fixing plate 30 along the third direction (Y direction). The cylinder bodies of the two cylinders are symmetrically fixed to both sides of the bottom surface of the guide fixing plate 30 via flange seats. The piston rods pass vertically downward through the through holes on the guide fixing plate 30, and their lower ends are connected to the bottom surface of the pressure claw fixing plate 31 via floating joints. The pressure claw fixing plate 31 and the guide fixing plate 30 are connected by four guide optical shafts and linear bearings to ensure that the pressure claw fixing plate 31 does not deflect during Z-axis movement. The two cylinders share the same air passage, and the mechanical synchronous action is achieved by parallel air supply through a three-way connector. The air passage of the first driving component 50 is equipped with a pressure regulating valve to limit the actual working pressure to a total clamping force of approximately 80-120 N for the twenty-one pressure claws 32 (approximately 4-6 N per claw). This clamping force is sufficient to flatten the warped shell and keyboard frame against the bottom surface of the contour positioning cavity 221 without causing plastic deformation of the shell.

[0046] It should be noted that since the first driving component 50 is mounted on the guide fixing plate 30, and the guide fixing plate 30 translates along the second direction under the drive of the second driving component 60, the first driving component 50 translates synchronously with the guide fixing plate 30. That is, while the first driving component 50 is pressing the housing in the Z direction, it can move in the X direction along with the guide fixing plate 30 and the pressure claw assembly as a whole. This is the structural basis for achieving "translational pushing while maintaining the pressing state". In the pressing state, the X-direction thrust is transmitted to the guide fixing plate 30 through the guide optical shaft and linear bearing, and then transmitted to the slide rail 41 by the slider 42. The cylinder piston rod does not bear the X-direction load, avoiding cylinder wear and seal failure.

[0047] 7. Second driving component; The second driving component 60 is an X-direction cylinder, used to drive the guide fixing plate 30 and the pressure claw assembly to translate along the second direction (X direction) while maintaining the clamping state, and push the housing against the stop component 91.

[0048] In this embodiment, the second driving component 60 is a single-acting cylinder (spring return type) with a stroke of 50 mm, matching the sliding stroke of the guide mechanism. The cylinder body of the second driving component 60 is fixed to one end of the base 10 along the second direction via a side-push mounting seat, and the piston rod extends along the second direction, with its end connected to the side of the guide fixing plate 30 via a side-push module. The air passage of the second driving component 60 is equipped with a pressure regulating valve to limit the actual thrust to approximately 70–100 N.

[0049] The side-push module includes a push plate and a connecting block. The push plate is a rectangular plate and is fixedly connected to the end of the piston rod; the connecting block screws the push plate to the side of the guide fixing plate 30. When the piston rod of the second driving member 60 extends, the push plate and the connecting block push the guide fixing plate 30 to move horizontally along the slide rail 41 toward the stop member 91; when the piston rod retracts, the spring restoring force pulls the guide fixing plate 30 back to its initial position.

[0050] The thrust of the second driving component 60 needs to overcome the friction between the housing and the bottom surface of the contour positioning cavity 221 (after the housing is compressed, the coefficient of friction is approximately 0.3, and the normal force N≈F). clamp +F vac +G≈135~195 N, frictional force approximately 40~59 N) and rolling friction between slider 42 and slide rail 41 (approximately 5 N), totaling frictional resistance of approximately 45~64 N. In this embodiment, the thrust of 70~100 N is greater than this resistance, providing sufficient thrust margin and preventing damage to the housing edge or stop 91 due to excessive thrust.

[0051] The key structural feature is that when the second driving member 60 drives the guide fixing plate 30 to translate, the first driving member 50 is not released, and the pressure claw 32 remains pressed against the housing. While the housing is pressed in the Z-direction, it translates along the X-direction with the pressure claw 32 until the edge of the housing abuts against the stop surface of the stop member 91. Since the housing is always pressed against the bottom surface of the contour positioning cavity 221 by the pressure claw 32 throughout the translation process, there is no possibility of it floating or losing constraint in the Z-direction. Therefore, the final position of the housing in the X-direction is entirely determined by the geometric position of the stop member 91 and is independent of the incoming dimensions of the housing.

[0052] 8. Vacuum adsorption assembly; The vacuum adsorption assembly includes a vacuum generator 71, a vacuum pipeline, and multiple adsorption elements 73.

[0053] Vacuum generator 71: Vacuum generator 71 is a vacuum generator (Venturi type), installed on the bottom surface of base 10, and connected to the factory compressed air source through an air pipe. The supply pressure of vacuum generator 71 is 0.5 MPa, and the vacuum degree produced is -60 kPa to -80 kPa.

[0054] Vacuum pipeline: The vacuum pipeline is led out from the vacuum generator 71, laid through the base 10, passes through the through hole inside the support column 21 to reach the bottom surface of the support plate 22, and then connects to each adsorption element 73 through the dark channel inside the support plate 22.

[0055] Adsorption component 73: The adsorption component 73 is a flat-headed vacuum suction cup. In this embodiment, the suction cup diameter is 10 mm, and the suction cup surface protrudes slightly from the bottom surface of the contour positioning cavity 221 (approximately 0.1–0.3 mm). In the adsorption state, it contacts the bottom surface of the housing and is compressed to form a seal. In this embodiment, there are twelve adsorption components 73 in total: four on one side of the touch panel area, six on the other side, and one at each of the two corners near the rotating shaft. The number and layout of the adsorption components 73 are not limited to this, with the principle of uniform distribution and preventing the housing from warping during the adsorption stage.

[0056] The working sequence of the vacuum adsorption assembly is as follows: After the housing is placed in the contour positioning cavity 221 and before the pressure claw 32 presses down, the vacuum generator 71 is activated, applying adsorption force to the bottom surface of the housing through twelve adsorption elements 73. The total adsorption force is approximately 55–75 N (the adsorption force of a single cup is approximately 4.5–6.5 N). The direction of the adsorption force is the first direction (Z-direction), i.e., vertically downward, pulling the housing taut towards the bottom surface of the contour positioning cavity 221. For housings with a warpage ≤0.3 mm, the adsorption force can initially flatten the warped area, making the bottom surface of the housing basically fit against the bottom surface of the contour positioning cavity 221, providing pre-flattening conditions for the subsequent uniform pressing of the pressure claw 32.

[0057] It should be noted that the vacuum adsorption component in this solution is positioned as "pre-leveling" rather than "final positioning." Its function is to roughly flatten the housing before the pressure claw 32 presses down, reducing the warpage that the pressure claw 32 needs to compensate for. For housings with warpage within the sealing compensation range (≤0.2 mm), vacuum adsorption can ensure a complete fit; for housings with larger warpage (0.2–0.3 mm), vacuum adsorption constrains it to the range covered by the 2 mm effective pressing stroke of the pressure claw 32. The two processes are sequentially connected and functionally complementary.

[0058] 9. Limiting components; The limiting assembly includes at least two sets of limiting members for circumferentially blocking and limiting the housing in the horizontal plane. In this embodiment, there are four limiting members in total, divided into two groups: the first group consists of two first limiting blocks 821 arranged along the second direction (X direction), located at both ends of the contour positioning cavity 221 along the X direction (one end of the first limiting block 821 is the mounting base of the blocking member 91); the second group consists of two second limiting blocks 822 arranged along the third direction (Y direction), located on both sides of the contour positioning cavity 221 along the Y direction.

[0059] In this embodiment, each of the two adjacent sides of the base 10 is provided with a grip position 14, and each grip position 14 has a limiting member on each side: wherein, the two first limiting blocks 821 on both sides of the grip position 14 on the X direction side are used to limit the movement range of the housing in the X direction (cooperating with the stop member 91); the two second limiting blocks 822 on both sides of the grip position 14 on the Y direction side are used to limit the movement range of the housing in the Y direction. The above arrangement utilizes the edge space on both sides of the grip position 14 to set the limiting members without interfering with the picking operation of the grip position 14.

[0060] The limiting components are made of elastic engineering plastics such as POM and are fixed to the top surface of the support plate 22 with screws. The number of limiting components is not limited to four, but at least two sets should be set to constrain the two horizontal degrees of freedom of the shell respectively. The specific number can be increased or decreased according to the size of the shell.

[0061] Through the coordinated action of the limiting components, the inner wall of the contour positioning cavity 221, and the stop 91, the shell's two degrees of freedom (X and Y directions) in the horizontal plane are constrained. Its vertical degree of freedom (Z direction) is constrained by the support of the bottom surface of the contour positioning cavity 221 and the clamping of the pressure claw 32. The rotational degrees of freedom of the shell around its three axes are limited by the aforementioned multi-point constraints. Thus, the shell is fully constrained in all six degrees of freedom.

[0062] 10. Calibrate the reference components; The top surface of the support plate 22 is also provided with calibration reference components 24. The calibration reference components 24 are two precision positioning pins made of high-hardness wear-resistant materials such as bearing steel, which are pressed into preset holes on the top surface of the support plate 22. The distance between the two calibration reference components 24 is 100 mm, the positional accuracy is ±0.01 mm, and they are located on the outer side of the contour positioning cavity 221 along the Y direction.

[0063] The purpose of calibration reference pieces 24 is to establish the origin and direction of the dispensing coordinate system using the two calibration reference pieces 24 as references before the dispensing process begins. Since the calibration reference pieces 24 are fixed to the support plate 22, their position does not change with fluctuations in the incoming dimensions of the housing. Therefore, the starting coordinates and direction of the dispensing path are "anchored" to the fixture itself, not the housing. Minor positional deviations of the housing within the contour positioning cavity 221 (caused by incoming dimension tolerances) will not be transmitted as dispensing path offsets.

[0064] In this embodiment, the position of the calibration reference piece 24 can be read and stored by the dispensing equipment during the first piece calibration. In subsequent production, it is not necessary to recalibrate each piece individually, but only once when changing the model or changing the fixture.

[0065] 11. Lifting drive unit (optional); In this embodiment, the fixture does not have a lifting drive component; after the operation is completed, the vacuum is broken, and the pressure claw 32 is lifted, the operator can directly remove the housing through the two adjacent side hand grips 14.

[0066] As an optional implementation, the fixture may also include a lifting drive. The lifting drive is a flat-headed cylinder mounted on the top surface of the base 10. The piston rod extends vertically upwards through a through hole in the support plate 22, and its top end has a flat-headed top block. The function of the lifting drive is as follows: after the adhesive bonding operation is completed, the vacuum is broken, and the pressure claw 32 is lifted, the piston rod of the lifting drive extends upwards by approximately 2 mm, and the flat-headed top block slightly lifts the housing from the contour positioning cavity 221, creating a gap between the bottom surface of the housing and the bottom surface of the contour positioning cavity 221, facilitating the removal of the housing. The thrust of the lifting drive is relatively small (approximately 10 N), and it is only used for demolding assistance and does not participate in positioning.

[0067] 12. Control components; The control component includes an operation panel located on the side of the base 10, which is equipped with a vacuum switch 101, a rise switch 102 and a side push switch 103.

[0068] Vacuum switch 101 is a toggle switch that controls the start and stop of vacuum generator 71; rise switch 102 is a jog button that controls the extension and retraction of first drive member 50 (i.e., the pressing and lifting of pressure claw 32); side push switch 103 is a jog button that controls the extension and retraction of second drive member 60 (i.e., the pushing and resetting of pressure claw assembly).

[0069] The operating sequence of the three switches is as follows: first, activate vacuum switch 101 to start adsorption → press up switch 102 to lower the pressure claw 32 → press side push switch 103 to push the pressure claw assembly together → after the operation is completed, reverse the sequence. The control component also includes a PLC controller located inside the base 10, which is used to implement the timing interlock of the above actions: when vacuum switch 101 is not activated, up switch 102 and side push switch 103 are locked to prevent pressing and pushing operations in the absence of adsorption.

[0070] Example 2: Positioning and Pressing Method Based on the positioning and pressing fixture described in Embodiment 1, this embodiment provides a positioning and pressing method for adhesive bonding of 3C product housings, including the following steps: Step S1: Loading and initial positioning.

[0071] The operator places the aluminum shell of the laptop's C-shell into the contour positioning cavity 221, ensuring the bottom surface of the shell is facing down and conforming to the bottom surface of the cavity 221. The shell initially contacts the various limiting components and the inner wall of the cavity 221. At this point, the shell is initially positioned horizontally. However, due to material warping, the middle part of the shell and the keyboard frame area may not be completely conforming to the bottom surface of the cavity 221, resulting in some areas being suspended.

[0072] Step S2: Vacuum adsorption tightening.

[0073] The operator activates vacuum switch 101, starting vacuum generator 71. This activates twelve suction cups 73 (flat-headed vacuum suction cups) to apply suction force to the bottom surface of the housing. The suction force is directed vertically downwards (first direction), pulling the housing taut towards the bottom surface of the contour positioning cavity 221. For areas with warpage ≤0.2 mm, the suction force ensures complete housing contact; for areas with warpage of 0.2–0.3 mm, the suction force ensures contact across most of the housing, with residual warpage constrained within the compensable range of the effective clamping stroke (2 mm) of the pressure claws 32.

[0074] The adsorption holding time is approximately 2 to 3 seconds. After the shell stabilizes, proceed to the next step.

[0075] Step S3: Press down the pressure claws to tighten.

[0076] When the operator presses the lifting switch 102, the piston rod of the first driving component 50 (two Z-direction double-acting cylinders) extends, driving the pressure claw fixing plate 31 to move downward relative to the guide fixing plate 30 along the guide optical axis. After the pressing surface of the pressure claw 32 contacts the upper surface of the workpiece, the elastic pad undergoes elastic deformation, applying a flexible clamping force to the housing. Among them, the pressing step 323 of each pressure claw 32 presses against the top surface of the keyboard frame rib, and its clearance part 322 crosses the key opening 13 without contacting it. The resultant force of the twenty-one pressure claws 32 is approximately 80-120 N, completely pressing the housing and keyboard frame flat against the bottom surface of the contour positioning cavity 221.

[0077] At this time, the shell is under a dual constraint state of "vacuum adsorption + mechanical compression", the Z-axis position is completely determined, and it is constrained by the limiting component in the horizontal plane.

[0078] Step S4: Push horizontally while maintaining the compressed state.

[0079] When the operator presses the side push switch 103, the piston rod of the second drive component 60 (X-direction cylinder) extends and pushes the guide fixing plate 30 to move along the slide rail 41 toward the stop component 91 through the side push module. The pressure claw fixing plate 31 and the pressure claw 32 move synchronously with the guide fixing plate 30.

[0080] The key feature is that the first driving member 50 remains in a clamped state and does not release during this step. The clamping claw 32 always applies a Z-direction clamping force to the housing, and the housing, while being clamped in the Z-direction, translates along the X-direction with the clamping claw 32. The translational stroke is approximately 5–15 mm (depending on the initial positional deviation of the housing material in the X-direction), until the X-direction end edge of the housing abuts against the stop surface of the stop member 91.

[0081] Because the housing is pressed against the bottom surface of the contour positioning cavity 221 by the pressure claw 32 throughout the translation process, there is no Z-direction floating or unconstrained gap, and the final X-direction position of the housing is completely determined by the geometric position of the stop 91. At the same time, the Y-direction is kept constrained by the limiting block 822, and the position of the housing in the horizontal plane is uniquely determined.

[0082] After being pushed into place, the second drive component 60 keeps the piston rod extended (i.e. maintains thrust) to prevent the housing from springing back.

[0083] Step S5: Applying adhesive and bonding.

[0084] With the housing fully positioned, clamped, and pushed against, the external dispensing equipment dispenses adhesive onto the housing according to a preset path. The dispensing path is established with the calibration reference 24 as the coordinate origin and is unaffected by fluctuations in the dimensions of the incoming housing material. During dispensing and pressure holding, the pressure claw 32 remains clamped, and the holding step 323 continuously applies local clamping force to the keyboard frame ribs to suppress keyboard frame deformation and adhesive overflow.

[0085] After the adhesive is applied, the plastic part is bonded to the aluminum sheet of the housing, and pressure is maintained for a certain period of time to allow the adhesive to initially cure.

[0086] Step S6: Release and feeding.

[0087] After the bonding work is completed, the operator shall perform the following release operations in sequence: (a) When the side push switch 103 is pressed in the reverse direction, the piston rod of the second drive member 60 retracts, and the guide fixing plate 30 and the pressure claw assembly are reset along the X direction; (b) Pressing the up switch 102 reverses the direction, the piston rod of the first drive member 50 retracts, the pressure claw 32 lifts up, and the clamping force on the housing is released; (c) Turning the vacuum switch 101 off, the vacuum generator 71 stops working, the adsorption component 73 breaks the vacuum, and the adsorption force between the housing and the bottom surface of the contour positioning cavity 221 disappears. (d) (Optional) If a lifting drive is provided, its piston rod extends upward by 2 mm to slightly lift the housing; this embodiment does not have a lifting drive, so this step is omitted. (e) The operator removes the bonded housing via the two hand grips 14 (or the housing is removed by the robotic arm).

[0088] The jig is restored to its initial state, ready to be loaded with the next housing.

[0089] Step S7: Loop.

[0090] Repeat steps S1 to S6 for continuous production.

[0091] Example 3: Adaptation for operating conditions with different warpage amounts This embodiment illustrates the fixture's adaptability to shells with different warpage amounts.

[0092] Condition 1: Warpage ≤ 0.1 mm. The incoming shell has good flatness. Vacuum adsorption step S2 can make the shell completely fit the bottom surface of the contour positioning cavity 221. When the pressure claw 32 presses down, it only needs to overcome a very small residual gap, and the pressure claws are evenly stressed. In this condition, vacuum adsorption plays the main role in flattening, and the pressure claw 32 mainly plays the role in locking and preventing warpage. The holding force on the keyboard frame is evenly distributed.

[0093] Condition 2: Warpage of 0.1–0.2 mm. The shell exhibits slight warpage. Vacuum adsorption step S2 can flatten most areas, but residual gaps of 0.05–0.1 mm may remain in the middle of the shell and the keyboard frame area. When the pressure claw 32 presses down, the compression of the elastic pad of the pressure claw 32 in areas with high warpage is slightly greater than in other areas, but it is still within the range of elastic deformation, and the pressure distribution is basically uniform.

[0094] Condition 3: Warpage of 0.2–0.3 mm. The shell warpage is quite noticeable. Vacuum adsorption step S2 can flatten the edge area of ​​the shell, but residual warpage of 0.1–0.15 mm remains in the center and keyboard frame area. At this point, the effect of vacuum adsorption is to reduce the warpage from 0.3 mm to approximately 0.15 mm, so that the residual warpage falls within the compensation range of the 2 mm effective clamping stroke of the pressure claw 32. After the pressure claw 32 presses down, the compression of the elastic pad of the pressure claw in the high-warpage area is significantly greater than in other areas, but still within the elastic range, and the shell and keyboard frame are completely flattened.

[0095] Without the vacuum adsorption step S2 (i.e., the comparative scheme), the pressure claw 32 needs to directly compensate for the full warpage of 0.3 mm. The shell elastically lifts up at the moment of pressing down, and the pressure claws are subjected to uneven force. The pressure claw 32 in the high warpage area may not be able to press effectively, resulting in keyboard frame deformation, glue separation and reduced positioning accuracy.

[0096] Example 4: Alternative Implementation; Alternative 1: Drive unit form.

[0097] The first drive element 50 and the second drive element 60 are not limited to the form of a cylinder. In another embodiment, the first drive element 50 can be an electric cylinder (servo motor + lead screw) to achieve precise control of the clamping force and pressure feedback; the second drive element 60 can be a linear motor to achieve programmable control of the pushing speed. When using an electric cylinder or a linear motor, a servo driver and a motion controller are added to the control components accordingly.

[0098] Alternative 2: Guiding mechanism form.

[0099] The guiding mechanism is not limited to the form of a linear guide rail + slider. In another embodiment, a guide post + linear bearing form can be used: two guide posts are fixed to the base 10 along the second direction, and the pressure claw fixing plate 31 is sleeved on the guide posts through two linear bearings to achieve sliding along the second direction. This form has a lower cost and is suitable for scenarios where the pushing accuracy requirement is ±0.05 mm.

[0100] Alternative 3: Adsorption element form.

[0101] The suction element 73 is not limited to a flat-head vacuum suction cup. In another embodiment, a corrugated suction cup or a sponge suction cup can be used, utilizing its elastic deformation to adapt to minor unevenness on the bottom surface of the housing; this form is suitable for scenarios where the bottom surface of the housing is not flat.

[0102] Alternative 4: Number and layout of pressure claws.

[0103] The number of pressure claws 32 is not limited to 21, and can be increased or decreased according to the size of the shell and the degree of warping, for example, 12 to 30. Their layout should be targeted according to the high-incidence areas of shell warping, with the principle of uniform distribution and tight clamping without warping. For shells without a keyboard frame (such as flat shells), the pressure claws 32 can be replaced with flat pressure claws without clearance parts, which directly press the flat area of ​​the shell.

[0104] Alternative 5: The contour positioning cavity form.

[0105] The contour positioning cavity 221 is not limited to the form of directly machining a groove on the top surface of the support plate 22. In another embodiment, a replaceable contour insert can be used, which is installed on the top surface of the support plate 22 via a quick-release structure (such as a magnetic or spring pin). When the product is changed, only the contour insert and the corresponding stop 91 and limiter need to be replaced, without replacing the entire support plate 22, thus reducing changeover costs and time.

[0106] Alternative 6: Calibration reference piece form.

[0107] The calibration reference element 24 is not limited to the form of two locating pins. In another embodiment, a combination of one locating pin and one V-groove, or three locating pins distributed in a triangle (three-point positioning) may be used, depending on the calibration method of the external dispensing equipment.

[0108] Alternative 7: Claw form.

[0109] The pressure claw 32 is not limited to an integral stepped shape. In another embodiment, a split assembly type can be adopted, that is, the pressure step 323 is fixed to the relief part 322 by screws, which makes it easy to replace the pressure step separately after it wears out; the relief form of the relief part 322 is not limited to a stepped relief notch, but can be a relief groove or a relief hole, as long as it can avoid the key opening 13 in the clamping state.

[0110] Example 5: Force Analysis During Working Process To enable those skilled in the art to better understand the working principle of this solution, the stress state of the shell in each step is analyzed below.

[0111] Step S2 (Vacuum Adsorption Stage): The shell is subjected to the following forces: The gravitational force G, directed vertically downwards, is approximately 0.15 N (the aluminum casing weighs approximately 15 g). The adsorption force F of the twelve adsorption elements vac With the suction cup pointing vertically downwards, the total adsorption force is approximately 55–75 N (suction cup diameter 10 mm, effective adsorption area approximately 78.5 mm²). 2 The single-cup adsorption force is approximately 4.7 to 6.3 N under a vacuum of -60 to -80 kPa. The supporting force N on the bottom surface of the contour positioning cavity is vertically upward, and is related to G+F. vac balance.

[0112] Adsorption force F vac Much greater than the weight G of the shell, ensuring that the shell is reliably pulled toward the bottom surface of the contour positioning cavity. For the warped area, the local pressure generated by the adsorption force (approximately 0.06–0.08 MPa) is sufficient to overcome the elastic restoring force generated by the warping of the shell (for a 0.4 mm thick aluminum plate, the elastic restoring force when the warping is 0.3 mm is approximately 2–5 N), thus flattening the warped area.

[0113] Step S3 (pressing down of the pressure claw): In addition to vacuum adsorption, the housing is subjected to an additional clamping force F from twenty-one clamping claws. clamp The force is vertically downwards, and the resultant force is approximately 80–120 N (approximately 4–6 N for a single claw). The total Z-axis force on the shell at this time is G+F. vac +F clamp The force is much greater than the elastic recovery force of the shell warping, and the shell and keyboard frame are completely flattened. Among them, the pressing step 323 of the pressing claw 32 applies local pressing force to the keyboard frame ribs, and forms a clamping pair with the keyboard frame support area on the bottom surface of the contour positioning cavity, which suppresses the local warping of the keyboard frame; the bottom surface of the clearance part 322 is higher than the key opening 13 and does not contact the edge of the key opening 13, avoiding stress concentration and appearance damage.

[0114] During this stage, the elastic pad undergoes elastic deformation (compression of approximately 0.1 mm), providing flexible contact and preventing indentations on the housing surface and keyboard frame caused by rigid pressing.

[0115] Step S4 (Pushing phase while maintaining compression): The shell is subjected to the following forces: Z-direction: Clamping force F clamp (Keep constant) + Adsorption force F vac + Gravity G is balanced with the supporting force N on the bottom surface of the contour positioning cavity; X direction: The thrust of the second driving component, pointing towards the stop 91; the frictional force f=μ×N between the housing and the bottom surface of the contour positioning cavity; the rolling frictional force between the slider and the slide rail; the stop reaction force of the stop 91.

[0116] The thrust of the second driving component must be greater than the total frictional resistance for the housing to slide. In this embodiment, the thrust of the second driving component is greater than this resistance, and the housing can be pushed smoothly. When the edge of the housing abuts against the stop 91, the thrust of the second driving component is balanced by the reaction force of the stop, the housing stops moving, and the X-direction position is determined.

[0117] Because the Z-axis clamping force remains constant throughout the entire pushing process, the normal force N between the housing and the bottom surface of the contour positioning cavity is constant, and the frictional force f is constant. Therefore, there is no possibility of the housing floating or "jumping" in the Z-axis. This is the essential difference from the step-by-step method in the prior art of "first releasing the clamping claw → then pushing to the side → then re-pressing".

[0118] Step S6 (Release Phase): The release sequence is as follows: first release the X-axis thrust (second drive component resets) → then release the Z-axis clamping force (first drive component resets) → finally release the vacuum (vacuum generator stops). This sequence ensures that the housing remains clamped in the Z-axis even when the X-axis constraint is lost, preventing it from bouncing due to residual stress; and remains vacuum-adhered even when the Z-axis clamping is lost, preventing it from shifting due to sudden release.

[0119] Example 6: Comparative trial production verification and effect analysis of the production line; Please see Figure 6 and Figure 7 To verify the technical effectiveness of the fixture of this invention, the applicant conducted a comparative trial production of the old and new fixtures in the same C-shell top cover adhesive bonding section: the old fixture was a step-by-step positioning fixture (first pressing, then releasing and pushing, without vacuum pre-leveling and calibration reference parts, all pressure claws were flat pressure claws, without pressure and clearance structures for the keyboard frame ribs); the new fixture was the fixture of this invention (a total of twenty-one pressure claws, all of which are clearance-type pressure claws with clearance parts 322 and pressure steps 323). The two trial productions were completed on the same production line and in the same shift (day shift), with a daily production of 1,500 pieces, each for 6 consecutive days, and a cumulative production of 9,000 pieces each.

[0120] (a) Overall yield comparison;

[0121] As shown in the table above, the new fixture improved the average yield by about 15 percentage points and reduced the total number of defects by 81.5%. Moreover, the lowest daily yield of the new fixture (96.1%) is still much higher than the highest daily yield of the old fixture (83.7%), and the daily fluctuation range has narrowed from 2.0 to 1.2 percentage points. This indicates that the present invention not only improved the yield level, but also significantly enhanced the process consistency and resistance to fluctuations.

[0122] (II) Comparison and grouping of adverse reaction types;

[0123] Grouping statistics: Glue overflow (glue overflow at the speaker location + glue overflow on the keyboard frame) decreased from 751 pieces to 42 pieces (-94.4%); deformation (deformation degree + keyboard frame deformation) decreased from 656 pieces to 130 pieces (-80.2%); and glue separation decreased from 42 pieces to 0 pieces (-100%). These three categories combined reduced by 1277 pieces, accounting for 99.6% of the total reduction in defects (1282 pieces). This means that the yield improvement almost entirely stemmed from the elimination of the three major defect families targeted by this invention: glue overflow, deformation, and glue separation.

[0124] (III) Analysis of the advantages of the plan; 1. The integrated press-push design eliminates unconstrained gaps, significantly reducing adhesive overflow defects. The two largest defects of the old fixture were adhesive overflow at the speaker position and adhesive overflow in the keyboard frame (a total of 751 pieces, accounting for 47.7% of the old fixture's defects). The root cause was that the step-by-step "press first, then push" method caused the housing to lose constraint and shift slightly during the action switching moment, resulting in misalignment of the dispensing path and the bonding surface. This invention maintains a pressurized state while pushing synchronously, with no unconstrained gaps throughout the process. In addition, the calibration reference component decouples the dispensing reference from the incoming material size fluctuations, reducing the two types of adhesive overflow by 96.3% and 92.0%, respectively. Among them, the twenty-one pressure claws continuously press the keyboard frame ribs during dispensing and pressure holding, preventing the adhesive from being squeezed out from the gap between the frame and the housing, further ensuring a 92.0% reduction in keyboard frame adhesive overflow.

[0125] 2. Vacuum pre-leveling + pressure equalization support + clamping claw frame rib clamping fundamentally eliminates deformation and delamination defects. The old fixture relied solely on mechanical clamping to compensate for incoming material warping, resulting in partial suspension of the shell and the clamping claws not specifically clamping the keyboard frame ribs, leading to a total of 656 instances of deformation and keyboard frame deformation. This invention first uses vacuum adsorption to make the shell conform to the contoured surface, eliminating most of the warping. Then, elastic pads provide pressure equalization support, and the clamping steps 323 of the clamping claws precisely press against the top surface of the keyboard frame ribs, while the clearance portion 322 straddles the key opening 13 without contacting it, forming a clamping pair with the bottom support area of ​​the contoured cavity. This provides localized clamping of the keyboard frame, completely eliminating keyboard frame deformation and delamination (100%), reducing overall deformation by 64.0%. Residual deformation is mainly related to the incoming material warping itself, and fixture-related factors have been largely eliminated.

[0126] 3. Calibration of reference parts improves process stability. The daily yield range of the new fixture narrowed to 1.2 percentage points, and the yield remained stable above 96% throughout the validation period, indicating that the robustness of the process was significantly enhanced after the positioning and dispensing references became independent of incoming material fluctuations.

[0127] 4. No new defects were introduced, and the causal relationship was clear. Defects unrelated to the fixture structure, such as mold bursting, bulging, pressure marks, and exposed areas, remained at a low level before and after the fixture change and showed no significant change (totaling 73→81 pieces). Scratches even decreased by 25.0%. Among them, pressure marks did not increase due to the increase in the number of pressure claws, which verified that the pressure claw clearance part (clearance height 1.5 mm) effectively avoided the key opening 13. This indicates that the two trial production conditions were comparable, and the yield improvement was indeed brought about by the improvement of the fixture structure, without introducing new appearance or adhesion risks.

[0128] (iv) Conclusion; Trial production results show that the fixture of this invention improved the adhesive bonding yield of the C-shell top cover from 82.5% to 96.8% (approximately +15 percentage points), and reduced the total number of defects by 81.5%; among them, glue overflow decreased by 94.4%, deformation decreased by 80.2%, and glue separation decreased by 100%, while process stability was improved simultaneously. The integrated pressing and pushing claw, vacuum adsorption pre-leveling, claw (yielding type) frame rib pressing and yielding, calibration reference parts, elastic pads, and other technical features correspond one-to-one with defect improvements, the cause-and-effect relationship is clear, and the technical effect is significant.

[0129] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A positioning and pressing fixture for dispensing and bonding the casing of 3C products, characterized in that, include: Base; A positioning component, located on the base, has a workpiece position for accommodating and positioning the housing of a 3C product; A stop is provided on one side of the workpiece position along the second direction; A guide plate is slidably connected to the base in a second direction via a guide mechanism; The pressure claw assembly includes a pressure claw fixing plate and a pressure claw disposed on the pressure claw fixing plate, wherein the pressure claw fixing plate is slidably connected to the guide fixing plate along a first direction; The first driving component is mounted on the guide fixing plate and drives the pressure claw fixing plate to move towards the workpiece position along the first direction to press the housing located at the workpiece position. The first direction intersects with the second direction. as well as The second driving component is used to drive the guide fixing plate to translate relative to the base along the second direction; The pressure claw assembly is configured such that, while the pressure claw is holding the housing in a pressing state, it can translate along a second direction under the drive of the second driving member, so that the pressure claw pushes the housing against the stop member.

2. The positioning and pressing fixture for dispensing adhesive bonding of 3C product housings according to claim 1, characterized in that, It also includes a vacuum adsorption component, which includes a vacuum generator and multiple adsorption components connected thereto, with the multiple adsorption components distributed at the workpiece location. The suction element is used to hold and tighten the housing along a first direction before the pressure claws press it.

3. The positioning and pressing fixture for dispensing adhesive bonding of 3C product housings according to claim 2, characterized in that, The positioning assembly includes a support column and a support plate. The support plate is supported above the base by the support column. The support plate has a contour positioning cavity, which forms the workpiece position. Multiple adsorption components are distributed within the contour positioning cavity, and the pressure claw is located on the side of the contour positioning cavity facing away from the base; a receiving space is formed between the support plate and the base, and the first driving component, the second driving component, and the guide mechanism are located within the receiving space.

4. The positioning and pressing fixture for dispensing adhesive bonding of 3C product housings according to claim 3, characterized in that, It also includes a limiting component, which includes at least two sets of limiting members, which are used to block and limit the housing along the second direction and the third direction respectively, and the third direction intersects with both the second direction and the first direction; The stop is a block located on one side of the support plate along the second direction.

5. The positioning and pressing fixture for dispensing adhesive bonding of 3C product housings according to claim 4, characterized in that, The pressure claw is L-shaped and includes a fixing part and a pressing part. The pressing part includes a relief part and a pressing step extending downward from the end of the relief part. The bottom surface of the relief part is higher than the bottom surface of the pressing step. The height difference between the two constitutes the relief height, so that the relief part avoids the housing and key opening when pressed. The pressing surface of the pressing step presses against the top surface of the keyboard frame rib.

6. The positioning and pressing fixture for dispensing adhesive bonding of 3C product housings according to claim 5, characterized in that, The support plate is also equipped with a calibration reference, which is used to allow external dispensing needles to calibrate their position relative to the housing.

7. The positioning and pressing fixture for dispensing adhesive bonding of 3C product housings according to claim 6, characterized in that, The first driving component consists of two Z-direction double-acting cylinders, which are respectively installed on both sides of the guide fixing plate along the third direction, and the piston rods are connected to the pressure claw fixing plate along the first direction; the second driving component is an X-direction cylinder, which is installed on the base and connected to the guide fixing plate via the side push module. The guiding mechanism includes a slide rail and a slider. The slide rail is fixed to the base, and the slider is fixed to the guide plate.

8. The positioning and pressing fixture for dispensing adhesive bonding of 3C product housings according to claim 7, characterized in that, It also includes a control component, which includes a vacuum switch, a rise switch and a side push switch located on the base, used to control the vacuum generator, the first drive component and the second drive component, respectively.

9. The positioning and pressing fixture for dispensing adhesive bonding of 3C product housings according to claim 8, characterized in that, At least one of the support plate and the base is provided with a hand grip; and / or, the support plate is provided with a screw slot; and / or, it also includes a lifting drive provided on the base, the lifting drive being a flat-head cylinder for lifting the housing in a first direction away from the workpiece position.

10. A positioning and pressing method for dispensing and bonding 3C product housings, characterized in that, The positioning and pressing fixture for dispensing and bonding 3C product housings as described in any one of claims 1 to 9 includes the following steps: S1. Place the housing at the workpiece position, and use the stop to block and limit the housing along the second direction; S2. Control the adsorption component of the vacuum adsorption assembly to tighten the housing along the first direction; S3. The first driving component drives the pressure claw assembly to move in the first direction, so that the pressure claw presses against the housing; S4. The second driving member drives the pressure claw assembly to translate along the second direction while the pressure claw is in the clamping state, so that the pressure claw pushes the housing against the stop member; S5. Apply adhesive and bond the clamped housing. After the operation is completed, remove the vacuum and reset the pressure claw assembly.

Images