A kind of sand blasting jig and method for preventing deformation of ultra-thin workpiece of electronic product

Abstract

This invention discloses a sandblasting fixture and method for preventing deformation of ultra-thin electronic product workpieces. The sandblasting fixture includes a sandblasting frame base (1) and multiple contoured supports (2) installed on the sandblasting frame base (1) that can be inserted into the workpiece (100). This invention can provide full contoured inner surface support for the workpiece (100) based on the contoured supports (2), thus effectively preventing deformation of the workpiece (100). Moreover, the sandblasting method is changed to two single-sided sandblastings. Since the width of the contoured support (2) is based on the lower tolerance dimension of the internal height of the workpiece (100), during the single-sided sandblasting process, the inner wall of one side corresponding to the length and width dimensions of the workpiece (100) is attached to the support surface of the contoured support (2), while the inner wall of the other side corresponding to the length and width dimensions of the workpiece (100) is free. This allows all the force on the workpiece (100) to be absorbed by the contoured support (2) without deformation.

Description

Technical Field

[0001] This invention relates to the field of sandblasting for electronic products, and more particularly to a sandblasting fixture and method for preventing deformation of ultra-thin electronic product workpieces. Background Technology

[0002] As people's consumption levels continue to rise, consumer electronics products are increasingly pursuing perfection. While superior performance is essential, ultra-lightweight, ultra-thin designs and a matte finish are increasingly sought after by consumers. Currently, sandblasting technology to achieve a matte finish on metal casings is widely used. However, as casings become increasingly thinner, the problem of casing deformation after sandblasting has become an unavoidable technical challenge for the industry. Specifically, sandblasting machines typically contain six to eight sandblasting guns, the positions of which are adjustable. The conventional method for sandblasting workpieces is to hang them on a rack and feed them into the sandblasting area via a conveyor belt. The sandblasting guns simultaneously spray sand particles from both sides, and then air is used to remove residual sand particles from the workpiece and the rack. Thicker workpieces or materials that are not easily deformed by plasticity show no deformation issues after sandblasting. However, in order to achieve high product quality, metal materials are generally used. In order to make the product less heavy, the choice of metal materials is further reduced, and lightweight aluminum materials are generally chosen. In addition, in order to make the product thinner, the aluminum material wall thickness must be the thinnest. On this basis, in order to make the product feel good, when sandblasting is performed, the industry has encountered an unprecedented problem: workpiece deformation when dealing with thin and easily deformable workpieces.

[0003] refer to Figure 1 Taking an aluminum casing of an electronic product as an example, the workpiece is a long, flat, hollow shell with a wall thickness of less than one millimeter. After sandblasting, the opening width (as shown by the arrow in the figure) is narrowed by an average of 6% compared to before sandblasting, resulting in a serious over-standard opening width. During product manufacturing, some parts have been dimensionally non-compliant for a long time due to the sandblasting process, and this problem cannot be resolved. The only option is to relax the acceptance standards, which brings endless hidden dangers to product quality. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a sandblasting fixture and method for preventing deformation of ultra-thin electronic product workpieces, in view of the above-mentioned defects of sandblasting deformation in the prior art.

[0005] The technical solution adopted by this invention to solve its technical problem is as follows: A sandblasting fixture for preventing deformation of ultra-thin electronic product workpieces is constructed. This fixture is used to install multiple workpieces and cooperate with a conveyor-type sandblasting machine to achieve batch sandblasting of the multiple workpieces. The workpiece is elongated and hollow inside. A pair of insertion holes are provided on the two end faces corresponding to the width and height dimensions of the workpiece. An open window is formed on one side corresponding to the length and height dimensions of the workpiece for assembly with an external structure. The sandblasting fixture includes a sandblasting frame base and multiple contoured supports installed on the sandblasting frame base that can be inserted into the workpiece. The multiple contoured supports are arranged sequentially with their arrangement direction perpendicular to the length direction of the contoured supports.

[0006] The workpiece is inverted onto the contour support through the open window. The surface of the contour support is made to completely conform to the inner surface morphology of the workpiece to achieve full contour support of the workpiece's inner surface. The width of the contour support is referenced to the lower tolerance dimension of the workpiece's internal height so that during single-sided sandblasting, the inner wall of one side corresponding to the length and width dimensions of the workpiece is attached to the support surface of the contour support, while the inner wall of the other side corresponding to the length and width dimensions of the workpiece is free. This allows the contour support to absorb all the force on the workpiece without deformation.

[0007] Furthermore, in the sandblasting fixture for preventing deformation of ultra-thin electronic product workpieces according to the present invention, the bottom sidewall of the contour support is fixed to the sandblasting frame base by a row of uprights, and the row of uprights is arranged along the length direction of the contour support, and the uprights are perpendicular to the length direction of the contour support.

[0008] Furthermore, in the sandblasting fixture for preventing deformation of ultra-thin electronic product workpieces according to the present invention, the two end faces of the contour support are provided with connecting holes that can face the insertion hole, and a rubber plug is movably inserted into the connecting hole. The rubber plug can extend out of the insertion hole to prevent the workpiece from falling off.

[0009] Furthermore, in the sandblasting fixture for preventing deformation of ultra-thin electronic product workpieces according to the present invention, multiple pairs of columns corresponding to multiple contoured supports are provided on both sides of the sandblasting frame base. The two end faces of the contoured supports are provided with connecting holes that can face the insertion holes. The two connecting holes of the contoured supports are assembled with a pair of columns on the sandblasting frame base through a pair of positioning pins of equal height to support the contoured supports from both ends.

[0010] Furthermore, in the sandblasting fixture for preventing deformation of ultra-thin electronic product workpieces according to the present invention, one of the pair of positioning pins is a fixed pin and the other is a movable pin, or both are movable pins.

[0011] One end of the fixed pin is inserted into the connecting hole, and the other end is embedded in the column and fixed with screws; one end of the movable pin is inserted into the connecting hole, and the other end is connected to the movable pin assembly installed on the column. The movable pin assembly can pull the movable pin to move back and forth along the length direction of the contour support to enter and exit the connecting hole.

[0012] Furthermore, in the sandblasting fixture for preventing deformation of ultra-thin electronic product workpieces according to the present invention, the connecting hole is a strip-shaped hole extending along the height direction on the end face of the contour support, and the movable pin is a flat shape matching the strip-shaped hole.

[0013] The movable pin assembly includes a piston, a compression spring, a compression spring mounting block, and a handle. A strip-shaped through hole facing the opposite column is provided on the column on which the movable pin is mounted. The compression spring mounting block is fixed on the column and has a compression spring chamber on the side facing the column that communicates with the strip-shaped through hole on the column. A through hole is provided at the bottom of the compression spring chamber. The piston passes through the through hole at the bottom of the compression spring chamber and is connected to the handle. The piston reciprocates in a fixed direction within the compression spring chamber. The movable pin passes through the strip-shaped through hole on the column and is connected to the piston. The piston is cylindrical. The compression spring is sleeved on the outside of the piston and its two ends abut against the movable pin and the bottom of the compression spring chamber, respectively.

[0014] Under the action of the compression spring, the movable pin is pressed into the connecting hole of the contour support. The handle can pull the piston and the movable pin, thereby compressing the compression spring and causing the movable pin to retract into the column.

[0015] Furthermore, in the sandblasting fixture for preventing deformation of ultra-thin electronic product workpieces described in this invention, the piston and the movable pin are integrally formed, the piston and the handle are threadedly connected, the end of the piston away from the movable pin has an internal hole with an internal thread on the hole wall, and the handle has an external thread.

[0016] Furthermore, in the sandblasting fixture for preventing deformation of ultra-thin electronic product workpieces according to the present invention, the connecting hole is a strip-shaped hole extending along the height direction on the end face of the contour support.

[0017] The fixing pin is T-shaped, including a cuboid head and a flat part that matches the strip hole. A rectangular recess facing the opposite column is provided on the column on which the fixing pin is installed to constrain the position and direction of the fixing pin. A through hole is opened in the center of the recess. A screw hole is provided in the center of the head of the fixing pin on the side away from the flat part. The head of the fixing pin is sunk into the recess of the column and fixed by a screw that extends from the through hole at the bottom of the recess.

[0018] Furthermore, in the sandblasting fixture for preventing deformation of ultra-thin electronic product workpieces according to the present invention, the sandblasting frame base includes a pair of longitudinal rods and multiple horizontal rods connected between the pair of longitudinal rods and corresponding to multiple contoured supports. The multiple horizontal rods are evenly spaced along the length direction of the longitudinal rods, the horizontal rods are perpendicular to the longitudinal rods, the horizontal rods are located directly below the corresponding contoured supports, and the column is provided at the intersection of the longitudinal rods and the horizontal rods.

[0019] This invention also provides a sandblasting method for preventing deformation of ultra-thin electronic product workpieces, implemented using the aforementioned sandblasting fixture. The method includes:

[0020] Place the workpiece upside down on the contour support with the open window facing downwards;

[0021] Adjust both the sandblasting gun and the air gun to the same side of the sandblasting fixture, and place them diagonally above and below the sandblasting fixture.

[0022] The sandblasting fixture is moved by a conveyor belt, and the sandblasting gun performs a single-sided sandblasting on the moving workpiece. The single-sided sandblasting includes: the spray guns distributed at the upper angle swinging downwards to spray sand, and the spray guns distributed at the lower angle swinging upwards to spray sand.

[0023] After rotating the sandblasting fixture horizontally 180 degrees, place it back onto the conveyor belt and perform a single-sided sandblasting operation again.

[0024] The sandblasting fixture and method for preventing deformation of ultra-thin electronic product workpieces of the present invention have the following beneficial effects: The present invention can support the workpiece with a fully contoured inner surface based on a contoured support body, thus effectively preventing workpiece deformation; moreover, the sandblasting method is changed to two single-sided sandblastings. Since the width of the contoured support body is referenced to the lower tolerance dimension of the internal height of the workpiece, during the single-sided sandblasting process, the inner wall of one side corresponding to the length and width dimensions of the workpiece is attached to the support surface of the contoured support body, while the inner wall of the other side corresponding to the length and width dimensions of the workpiece is free, thereby allowing all the force on the workpiece to be absorbed by the contoured support body without deformation. Attached Figure Description

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

[0026] Figure 1 This is a comparative diagram showing the deformation of electronic products caused by existing sandblasting methods;

[0027] Figure 2This is a schematic diagram of the workpiece's structure;

[0028] Figure 3 This is a schematic diagram of the sandblasting frame base in Embodiment 1;

[0029] Figure 4 This is a schematic diagram of the contour support structure in Embodiment 1;

[0030] Figure 5 This is a schematic diagram of the sandblasting fixture formed by assembling the sandblasting frame base and the contour support body in Embodiment 1.

[0031] Figure 6 This is a schematic diagram of the workpiece mounted on the sandblasting fixture;

[0032] Figure 7 This is a cross-sectional view of the fixing pin in Embodiment 1;

[0033] Figure 8 This is an unfolded diagram of the fixing pin in Embodiment 1;

[0034] Figure 9 This is a cross-sectional view of the movable pin in Example 1;

[0035] Figure 10 This is the unfolded diagram of the movable pin in Example 1;

[0036] Figure 11 This is a schematic diagram of the sandblasting fixture in Example 2;

[0037] Figure 12 This is a schematic diagram of the sandblasting method. Detailed Implementation

[0038] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Typical embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0039] Example 1

[0040] refer to Figure 2The workpiece 100 of this invention is elongated and hollow inside. A pair of insertion holes 101 are positioned opposite each other on the two end faces corresponding to the width W and height H dimensions of the workpiece 100. An open window 102 is formed on one side corresponding to the length L and height H dimensions of the workpiece 100 for assembly with an external structure. In this embodiment, the workpiece 100 is specifically the frame of an e-book, with a length L of 250mm, a width W of 15mm, and a height H of 5mm. The pair of insertion holes 101 on the two end faces are specifically USB ports. The open window 102 is designed for connecting the frame to the main structure of the e-book; specifically, a 248mm*12mm*3.8mm open window 102 is centrally located on the 5mm*250mm bottom wall. The inner wall of the workpiece 100 has multiple steps, and the surface of the workpiece 100 is sandblasted using a conveyor-type sandblasting machine.

[0041] refer to Figure 3-5 This embodiment of a sandblasting fixture for preventing deformation of ultra-thin electronic product workpieces is used to mount multiple workpieces 100 and cooperate with a conveyor-type sandblasting machine to achieve batch sandblasting of multiple workpieces 100. The conveyor-type sandblasting machine includes a conveyor belt, a sandblasting gun, and an air gun. In this embodiment, after the workpieces 100 are mounted on the sandblasting fixture, they are placed on the conveyor belt for transport. During the transport process, the sandblasting gun, which is fixedly set, performs sandblasting. The gun head of the sandblasting gun swings during sandblasting. The sandblasting fixture includes a sandblasting frame base 1 and multiple contoured supports 2 mounted on the sandblasting frame base 1 that can be inserted into the workpieces 100. The multiple contoured supports 2 are arranged sequentially and evenly at intervals, and the arrangement direction is perpendicular to the length direction of the contoured supports 2. This embodiment only illustrates the case where three contoured supports 2 are set on the sandblasting frame base 1, but it is not limited to this. The number of contoured supports 2 can be adjusted as needed.

[0042] refer to Figure 6The workpiece 100 is inverted onto the contour support 2 through the open window 102. The length L of the workpiece 100 is parallel to the length L of the contour support 2, the height H of the workpiece 100 is parallel to the width W of the contour support 2, and the width W of the workpiece 100 is parallel to the height H of the contour support 2. The contour support 2 is in direct contact with the workpiece 100. The surface of the contour support 2 is completely made according to the inner surface morphology of the workpiece 100, avoiding interference with features such as protrusions and steps on the inner wall of the workpiece 100, and achieving full contour support for the inner surface of the workpiece 100. All edges and corners of the contour support 2 are rounded to avoid scratching the workpiece 100. The contour support 2 is made of steel with good rigidity to ensure that it does not deform under stress during sandblasting. The width W of the contour support 2 is referenced to the lower tolerance dimension of the internal height H of the workpiece 100 so that during the single-sided sandblasting process, the inner wall of one side corresponding to the length L and width W of the workpiece 100 is attached to the support surface of the contour support 2, while the inner wall of the other side corresponding to the length L and width W of the workpiece 100 is free. This allows all the force on the workpiece 100 to be absorbed by the contour support 2 without deformation.

[0043] The main function of the sandblasting frame base 1 is to support the contour support 2. There are various specific ways the sandblasting frame base 1 supports the contour support 2; in this embodiment, one contour support 2 is supported at both ends. Specifically, multiple pairs of uprights 12 are provided on both sides of the sandblasting frame base 1, corresponding to the multiple contour support 2. Each contour support 2 is supported at one end by one upright 12, meaning one contour support 2 is supported by two uprights 12 at both ends. The two uprights 12 in each pair are completely identical in size and symmetrical.

[0044] refer to Figure 3 The sandblasting frame base 1 includes a pair of vertical rods 11a and multiple horizontal rods 11b connected between the pair of vertical rods 11a and corresponding to the multiple contour support bodies 2, all located on the same horizontal plane. The horizontal rods 11b are evenly spaced along the length of the vertical rods 11a, perpendicular to the vertical rods 11a, and located directly below the corresponding contour support body 2. A column 12 is provided at the intersection of the vertical rods 11a and the horizontal rods 11b to support the end of the contour support body 2. The crisscrossing of the frame and horizontal rods 11b ensures that no excessive sand particles remain. The size of the sandblasting frame base 1 is determined according to the size of the workpiece 100 and the model of the sandblasting machine.

[0045] More specifically, the two end faces of the contour support 2 are provided with connecting holes 21 that can face the insertion hole 101. The connecting holes 21 are strip-shaped holes extending along the height direction on the end faces of the contour support 2. The two connecting holes 21 of the contour support 2 are assembled with a pair of uprights 12 on the sandblasting frame base 1 by a pair of positioning pins of equal height to support the contour support 2 from both ends.

[0046] In this embodiment, one of the pair of positioning pins is a fixed pin 13 and the other is a movable pin 14, meaning the fixed pin 13 and the movable pin 14 are respectively disposed on the two columns 12 of the same pair. In a static state, the exposed portions of the fixed pin 13 and the movable pin 14 have completely identical appearances, with all edges chamfered to facilitate insertion into the connecting holes 21 on the contoured support 2. The fixed pins 13 and the movable pins 14 of the same pair are at the same height on the column 12 and are coplanar. Of course, in other embodiments, both positioning pins can be movable pins 14.

[0047] refer to Figure 7-8 One end of the fixing pin 13 is inserted into the connecting hole 21 of the contour support 2, and the other end can pass through the insertion hole 101 of the workpiece 100 and be embedded in the column 12 and fixed with screws 16. Specifically, the fixing pin 13 is T-shaped, including a cuboid head 131 and a flat part 132 that matches the strip hole. A rectangular recess 121 facing the opposite column 12 is provided on the column 12 on which the fixing pin 13 is installed to constrain the position and direction of the fixing pin 13. A through hole is opened in the center of the recess 121. A screw hole is provided in the center of the head 131 of the fixing pin 13 on the side away from the flat part 132. The head 131 of the fixing pin 13 is sunk into the recess 121 of the column 12 and fixed with screws 16. Specifically, the screws 16 extend from the through hole at the bottom of the recess 121 into the screw hole of the head 131 of the fixing pin 13 for threaded engagement.

[0048] refer to Figure 9-10 One end of the movable pin 14 is inserted into the connecting hole 21, and the other end passes through the insertion hole 101 and is connected to the movable pin assembly 15 installed on the column 12. The movable pin assembly 15 can pull the movable pin 14 to reciprocate along the length direction of the contour support 2.

[0049] Specifically, the movable pin assembly 15 includes a piston 151, a compression spring 152, a compression spring mounting block 154, and a handle 153. The movable pin 14 is flat and matches the connecting hole 21. The compression spring mounting block 154 includes a cylindrical main body and two ears facing each other, which are connected to the outer wall of the main body at a position flush with the end of the main body. The piston 151 is cylindrical and consists of a cylindrical part and a U-shaped handle connected to the end of the cylindrical part. A strip-shaped through hole 122 adapted to the movable pin 14 is provided on the column 12 on which the movable pin 14 is mounted, facing the opposite column 12. The two ears of the compression spring mounting block 154 are fixed to the column 12 by two screws 17. The main body of the compression spring mounting block 154 facing the column 12 has a compression spring chamber 1541 that communicates with the strip-shaped through hole 122 on the column 12. A through hole is opened at the bottom of the compression spring chamber 1541. The piston 151 passes through the through hole at the bottom of the compression spring chamber 1541 and is connected to the handle 153. The piston 151 reciprocates in a fixed direction in the compression spring chamber 1541. The movable pin 14 passes through the strip-shaped through hole 122 on the column 12 and extends into the compression spring chamber 1541 to connect with the piston 151. The compression spring 152 is sleeved on the piston 151. One end of the compression spring 152 abuts against the end face of the movable pin 14 that is connected to the piston 151, and the other end of the compression spring 152 abuts against the bottom of the compression spring chamber 1541. Under the action of the compression spring 152, the movable pin 14 is pressed into the connecting hole 21 of the contour support 2. The handle 153 can pull the piston 151 and the movable pin 14 to compress the compression spring 152, so that the movable pin 14 retracts into the column 12.

[0050] In this embodiment, the piston 151 and the movable pin 14 are integrally formed, that is, the two are a single unit, with the movable pin 14 at the front and the piston 151 at the rear. The piston 151 is threadedly connected to the handle 153. The end of the piston 151 away from the movable pin 14 has an internal hole with internal threads on the hole wall, and the cylindrical part of the handle 153 has external threads on the outside. The cylindrical part of the handle 153 is threadedly connected to the piston 151.

[0051] The working principle of this embodiment is as follows: The workpiece 100 is inverted on the contour support 2. When it enters one side of the sandblasting zone, sand particles are sprayed onto the surface of the workpiece 100, generating strong pressure on it. The inner surface of the workpiece 100 facing the spray gun is tightly attached to the surface of the contour support 2 on the same side, while the other side is completely free. The impact force of the high-speed sprayed sand particles on the workpiece 100 is entirely transferred to the contour support 2. The contour support 2 is stably supported by the column 12. In this way, the workpiece 100 does not undergo any deformation during the entire sandblasting process, achieving the purpose of preventing the workpiece 100 from deforming. The most crucial aspect of this embodiment is that the width of the contour support 2 is based on the lower tolerance dimension of the internal height of the workpiece 100, and sandblasting is not performed simultaneously on both sides, but only from one side at a time, with the un-sandblasted side providing sufficient tolerance. Because workpiece 100 has dimensional tolerances during processing, the copying body can only refer to the minimum inner width of workpiece 100. When the dimensions of workpiece 100 exceed the tolerance, there will be a gap between the copying body and workpiece 100. If sandblasting is performed on both sides at the same time, workpiece 100 will still undergo plastic deformation under strong pressure.

[0052] Example 2

[0053] refer to Figure 11 The difference between this embodiment and Embodiment 1 lies in the specific support method of the sandblasting frame base 1 for the contour support 2. In this embodiment, the contour support 2 is no longer supported at both ends, but at the bottom. Specifically, the bottom sidewall of the contour support 2 is fixed to the sandblasting frame base 1 by a row of uprights 18. The row of uprights 18 is arranged along the length direction of the contour support 2, and the uprights 18 are perpendicular to the length direction of the contour support 2.

[0054] It is understandable that we can also combine the features of Embodiment 1 with the features of this embodiment. For example, we can change both positioning pins in Embodiment 1 to movable pins 14, and then add a row of uprights 18 at the bottom for support, based on the movable pins 14 supporting both ends.

[0055] In a further preferred embodiment, the two end faces of the contour support 2 are provided with connecting holes 21 that can face the insertion hole 101. A rubber plug 19 is movably inserted into the connecting hole 21, and the rubber plug 19 can extend out of the insertion hole 101 to prevent the workpiece 100 from falling off.

[0056] Example 3

[0057] This embodiment discloses a sandblasting method for preventing deformation of ultra-thin electronic product workpieces, implemented based on the sandblasting fixture of Embodiment 1 or Embodiment 2 described above. (Reference) Figure 12 The method includes:

[0058] 1) Place the workpiece 100 upside down on the contour support 2 with the open window 102 facing downwards;

[0059] If the sandblasting fixture of Embodiment 1 is used, the specific steps are as follows: First, the workpiece 100 is placed on the contour support 2 with the open window 102 facing downwards, and the workpiece 100 and the contour support 2 are assembled into a combination; then, the combination of the workpiece 100 and the contour support 2 is installed on the positioning pin with the open window 102 facing downwards. Specifically, the connecting hole 21 at one end of the contour support 2 is aligned and fitted onto the fixing pin 13, the handle 153 is pulled to retract the movable pin 14 into the column 12, the connecting hole 21 at one end of the contour support 2 is aligned with the movable pin 14, the handle 153 is released, and the movable pin 14 slides into the connecting hole 21 of the contour support 2.

[0060] If the sandblasting fixture of Embodiment 2 is used, the specific steps are as follows: First, put the workpiece 100 onto the contour support 2 with the open window 102 facing down; then, insert the rubber plug 19 into the connecting holes 21 at both ends of the contour support 2.

[0061] 2) As shown in Figure (a), adjust all the sandblasting guns and air guns to the same side of the sandblasting fixture and distribute them diagonally above and below the sandblasting fixture. Adjust the position and swing angle of the sandblasting guns to ensure that each workpiece is within the effective sandblasting range.

[0062] The arrows pointing diagonally upwards and downwards in the diagram represent sandblasting guns.

[0063] 3) The sandblasting fixture is moved by the conveyor belt, and the sandblasting gun performs one-sided sandblasting on the moving workpiece 100. The single-sided sandblasting includes: the spray guns distributed at the upper angle swinging downwards to spray sand, and the spray guns distributed at the lower angle swinging upwards to spray sand.

[0064] 4) As shown in Figure (b), rotate the sandblasting fixture horizontally 180 degrees and put it back on the conveyor belt, and perform one-sided sandblasting again.

[0065] 5) If the fixture of Example 1 is used, after sandblasting, remove the assembly of workpiece 100 and contour support 2, and then remove contour support 2. If the fixture of Example 2 is used, after sandblasting, remove rubber plug 19, and then remove workpiece 100.

[0066] In summary, the sandblasting fixture and method for preventing deformation of ultra-thin electronic product workpieces of the present invention have the following beneficial effects: The present invention can support the workpiece with a fully contoured inner surface based on a contoured support body, thus effectively preventing workpiece deformation; moreover, the sandblasting method is changed to two single-sided sandblastings. Since the width of the contoured support body is referenced to the lower tolerance dimension of the internal height of the workpiece, during the single-sided sandblasting process, the inner wall of one side corresponding to the length and width dimensions of the workpiece is attached to the support surface of the contoured support body, while the inner wall of the other side corresponding to the length and width dimensions of the workpiece is free, thereby allowing all the force on the workpiece to be absorbed by the contoured support body without deformation.

[0067] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0068] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0069] The terms "first," "second," and other ordinal numbers used in this specification are used to describe various constituent elements, but these constituent elements are not limited by these terms. The purpose of using these terms is solely to distinguish one constituent element from others. For example, without departing from the scope of the invention, a first constituent element may be named a second constituent element, and similarly, a second constituent element may be named a first constituent element.

[0070] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A sandblasting fixture for preventing deformation of ultra-thin electronic product workpieces, used to install multiple workpieces (100) and cooperate with a conveyor-type sandblasting machine to achieve batch sandblasting of multiple workpieces (100), wherein the workpiece (100) is elongated and hollow inside, a pair of insertion holes (101) are provided on the two end faces corresponding to the width and height dimensions of the workpiece (100), and an open window (102) is formed on one side corresponding to the length and height dimensions of the workpiece (100) for assembling the workpiece (100) with an external structure, characterized in that, The sandblasting fixture includes a sandblasting frame base (1) and a plurality of contoured supports (2) installed on the sandblasting frame base (1) that can be inserted into the workpiece (100). The plurality of contoured supports (2) are arranged in sequence and the arrangement direction is perpendicular to the length direction of the contoured supports (2). The workpiece (100) is inverted onto the contour support (2) through the open window (102). The surface of the contour support (2) is made entirely according to the inner surface morphology of the workpiece (100) to achieve full contour support of the inner surface of the workpiece (100). The width of the contour support (2) is referenced to the lower tolerance dimension of the internal height of the workpiece (100) so that during the single-sided sandblasting process, the inner wall of one side corresponding to the length and width dimensions of the workpiece (100) is attached to the support surface of the contour support (2), while the inner wall of the other side corresponding to the length and width dimensions of the workpiece (100) is free. This allows all the force on the workpiece (100) to be absorbed by the contour support (2) without deformation. The two end faces of the contour support (2) are provided with connecting holes (21) facing the insertion hole (101). A rubber plug (19) is movably inserted into the connecting hole (21). The rubber plug (19) extends out of the insertion hole (101) to prevent the workpiece (100) from falling off. The sandblasting frame base (1) has multiple pairs of columns (12) on both sides corresponding to the multiple contour support bodies (2). The two end faces of the contour support body (2) are provided with connection holes (21) facing the insertion hole (101). The two connection holes (21) of the contour support body (2) and a pair of columns (12) on the sandblasting frame base (1) are assembled with a pair of positioning pins of equal height to support the contour support body (2) from both ends. One of the pair of positioning pins is a fixed pin (13) and the other is a movable pin (14), or both are movable pins (14). One end of the fixed pin (13) is inserted into the connecting hole (21), and the other end is embedded in the column (12) and fixed with screws (16); one end of the movable pin (14) is inserted into the connecting hole (21), and the other end is connected to the movable pin assembly (15) installed on the column (12). The movable pin assembly (15) pulls the movable pin (14) to move back and forth along the length of the contour support (2) to enter and exit the connecting hole (21). The connecting hole (21) is a strip-shaped hole extending along the height direction on the end face of the contour support (2), and the movable pin (14) is a flat shape that matches the strip-shaped hole; The movable pin assembly (15) includes a piston (151), a compression spring (152), a compression spring mounting block (154), and a handle (153). A strip-shaped through hole (122) facing the opposite column (12) is provided on the column (12) where the movable pin (14) is mounted. The compression spring mounting block (154) is fixed to the column (12) and has a compression spring chamber (1541) on its side facing the column (12) that communicates with the strip-shaped through hole (122) on the column (12). The compression spring chamber (1541) A through hole is opened at the bottom. The piston (151) passes through the through hole at the bottom of the compression spring chamber (1541) and is connected to the handle (153). The piston (151) moves back and forth in a fixed direction in the compression spring chamber (1541). The movable pin (14) passes through the strip-shaped through hole (122) on the column (12) and is connected to the piston (151). The piston (151) is cylindrical. The compression spring (152) is sleeved on the piston (151) and its two ends abut against the movable pin (14) and the bottom of the compression spring chamber (1541) respectively. Under the action of the compression spring (152), the movable pin (14) is pressed into the connecting hole (21) of the contour support (2). The handle (153) pulls the piston (151) and the movable pin (14), thereby compressing the compression spring (152) and causing the movable pin (14) to retract into the column (12). The piston (151) and the movable pin (14) are integrally formed. The piston (151) and the handle (153) are threadedly connected. The end of the piston (151) away from the movable pin (14) has an internal hole with an internal thread on the hole wall. The handle (153) has an external thread. The connecting hole (21) is a strip-shaped hole extending along the height direction on the end face of the contour support (2); The fixing pin (13) is T-shaped, including a cuboid head (131) and a flat part (132) that matches the strip hole. A rectangular recess (121) facing the opposite side of the column (12) is provided on the column (12) on which the fixing pin (13) is installed to constrain the position and direction of the fixing pin (13). A through hole is opened in the center of the recess (121). A screw hole is provided in the center of the head (131) of the fixing pin (13) on the side away from the flat part (132). The head (131) of the fixing pin (13) is sunk into the recess (121) of the column (12) and fixed by a screw (16) that extends from the through hole at the bottom of the recess (121).

2. The sandblasting fixture for preventing deformation of ultra-thin electronic product workpieces according to claim 1, characterized in that, The bottom sidewall of the contour support (2) is fixed to the sandblasting frame base (1) by a row of uprights (18). The row of uprights (18) is arranged along the length direction of the contour support (2) and the uprights (18) are perpendicular to the length direction of the contour support (2).

3. The sandblasting fixture for preventing deformation of ultra-thin electronic product workpieces according to claim 1, characterized in that, The sandblasting frame base (1) includes a pair of vertical rods (11a) and multiple horizontal rods (11b) connected between the pair of vertical rods (11a) and corresponding to multiple contoured supports (2). The multiple horizontal rods (11b) are evenly spaced along the length direction of the vertical rods (11a). The horizontal rods (11b) are perpendicular to the vertical rods (11a) and are located directly below the corresponding contoured supports (2). The column (12) is set at the junction of the vertical rods (11a) and the horizontal rods (11b).

4. A sandblasting method for preventing deformation of ultra-thin electronic product workpieces, implemented based on the sandblasting fixture described in claim 1, characterized in that, The method includes: Place the workpiece (100) upside down on the contour support (2) with the open window (102) facing down; Adjust both the sandblasting gun and the air gun to the same side of the sandblasting fixture, and place them diagonally above and below the sandblasting fixture. The sandblasting fixture is moved by the conveyor belt, and the sandblasting gun performs one-sided sandblasting on the moving workpiece (100). The single-sided sandblasting includes: the spray guns distributed at the upper angle swinging downwards to spray sand, and the spray guns distributed at the lower angle swinging upwards to spray sand. After rotating the sandblasting fixture horizontally 180 degrees, place it back onto the conveyor belt and perform a single-sided sandblasting operation again.

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