Glue sealing structure and glue sealing method based on sacrificial material

Abstract

The invention provides a glue sealing structure and method based on a sacrificial material, the glue sealing structure comprises the sacrificial material, an insert and a rear mold, the rear mold is internally provided with a groove for accommodating the sacrificial material, the insert is arranged on the rear mold and close to one side of the groove, and the sacrificial material is arranged in the groove. When the sacrifice material is embedded into the groove, the sacrifice material extrudes the insert, an avoiding structure is arranged on the side, attached to the insert, of the sacrifice material and corresponds to the rear mold, and the avoiding structure is used for providing a deformation space for the sacrifice material. According to the invention, the problems of glue overflow and slide block clamping mouth burrs which are easily caused when a collision slide block or a four-side slide block structure is used for glue sealing in the injection molding process can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of mold injection molding, and in particular to a sealing structure and a sealing method based on sacrificial materials. Background Art

[0002] When many products are injection molded, they require a structure of opposing sliders or four-sided sliders. Figure 1 The slider 6 in the figure is a common slider structure. At position A, the slider 6 and the insert 2 are sealed by the glue. However, since the tolerance of the insert 2 is usually difficult to control, the slider 6 cannot guarantee that the insert 2 can be fully squeezed. In addition, the fluidity of silicone is very strong (a gap of 0.005mm will cause glue overflow), so it is difficult to avoid the glue overflow problem. In addition, structures such as the butting slider and the four-sided slider have high requirements for fitter mold matching. Once the butting slider or the four-sided slider has insufficient processing accuracy or during the actual operation, the butting slider or the four-sided slider has structural defects due to collision, which can easily cause silicone glue overflow at the joints. It is difficult to achieve stable mass production of such structures. Summary of the invention

[0003] In view of the above problems, the purpose of the present invention is to provide a sealing structure and a sealing method based on sacrificial materials to solve the problem of overflowing glue and burrs on the slider clamp when using a collision slider or a four-sided slider structure for sealing during the injection molding process.

[0004] The present invention provides a sealing structure based on sacrificial material, comprising: sacrificial material, an insert attached to the sacrificial material, and a rear mold, wherein:

[0005] A groove for accommodating the sacrificial material is provided in the rear mold, and the insert is provided on the rear mold and close to one side of the groove. When the sacrificial material is embedded in the groove, the sacrificial material squeezes the insert.

[0006] A avoidance structure is provided at a position corresponding to the rear mold on a side where the sacrificial material is in contact with the insert, and the avoidance structure is used to provide a deformation space for the sacrificial material.

[0007] In addition, a preferred solution is that the sacrificial material has a first side wall inclined away from the insert along a first direction and a second side wall in contact with the side edge of the insert;

[0008] When the sacrificial material is initially embedded in the groove, a gap is provided between the second side wall and the insert and the rear mold;

[0009] When the sacrificial material is embedded in the groove, the second side wall of the sacrificial material continuously approaches and presses the insert.

[0010] In addition, a preferred solution is that an inclined wall adapted to the first side wall is provided at a position of the groove corresponding to the first side wall.

[0011] In addition, a preferred solution is that an interference is provided between the first side wall and the inclined wall, and the second side wall is pressed and fitted onto the insert by the extrusion force generated by the interference.

[0012] In addition, a preferred solution is that the rear mold is provided with a first protrusion and a second protrusion on both sides of the groove, a connecting body is provided between the first protrusion and the second protrusion, the first protrusion, the second protrusion and the connecting body enclose the groove, and the first protrusion is higher than the second protrusion.

[0013] In addition, a preferred solution is that the insert is arranged on the second convex body, and the top surface of the insert is higher than the top surface of the first convex body.

[0014] In addition, a preferred solution is that before mold closing, the sacrificial material fits the insert and the rear mold, and the top surface of the sacrificial material is higher than the top surface of the first convex body.

[0015] In addition, a preferred solution is to further include a front mold, wherein:

[0016] The front mold is used to form an injection molded product by combining with the insert, the sacrificial material and the rear mold.

[0017] In addition, a preferred solution is that the sacrificial material fits with the rear mold, the insert, the injection molded product and the front mold after mold closing;

[0018] After mold closing, the sacrificial material fits with the insert, the injection molded product, the front mold and the back mold, and the top surface of the sacrificial material and the top surface of the first convex body are located on the same plane, and the injection molded product fits with the insert and the sacrificial material.

[0019] The present invention also provides a sealing method based on sacrificial materials, wherein the sealing structure based on sacrificial materials is used for sealing, and the method comprises:

[0020] Before closing the mold, a sacrificial material is placed in the groove of the rear mold, wherein a portion of the sacrificial material is sunk into the groove, and a gap is provided between the sacrificial material and the insert and the rear mold;

[0021] When the mold is closed, the sacrificial material is completely squeezed into the groove under the action of the mold closing force;

[0022] After the mold is closed, the sacrificial material is attached to the insert by the extrusion force generated by the interference between the first side wall of the sacrificial material and the inclined wall of the groove, so as to achieve sealing adhesion between the sacrificial material and the insert.

[0023] In addition, a preferred solution is that, during the process in which the sacrificial material partially sinks into the groove,

[0024] The length of the sacrificial material sunk into the groove is L, and the height of the sacrificial material is H, wherein L:H≥2:3.

[0025] In addition, a preferred solution is to determine the gap value between the sacrificial material and the insert and the back mold according to the tolerance between the insert and the sacrificial material.

[0026] In addition, a preferred solution is to determine the interference between the inclined first side wall and the inclined wall of the groove according to the clearance value.

[0027] It can be seen from the above technical scheme that the sealing structure and sealing method based on sacrificial materials provided by the present invention assist in sealing by means of sacrificial materials, and an interference is set between the inclined wall of the groove of the rear mold and the first side wall (inclined surface structure) of the sacrificial material. After the sacrificial material is placed in the groove of the rear mold, the sacrificial material cannot be placed to the bottom due to the interference of the first side wall. The sacrificial material is pressed to the bottom of the groove by the Z-direction force of the mold closing, and the interference is converted into sealing force in the X and Y directions, thereby achieving the purpose of sealing, thereby solving the problem of overflow of glue and burrs on the slider clamp when using a collision slider or a four-sided slider structure for sealing during the injection molding process.

[0028] In order to achieve the above and related purposes, one or more aspects of the present invention include the features that will be described in detail later. The following description and the accompanying drawings describe some exemplary aspects of the present invention in detail. However, these aspects indicate only some of the various ways in which the principles of the present invention can be used. In addition, the present invention is intended to include all these aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] By referring to the following description in conjunction with the accompanying drawings, and with a more comprehensive understanding of the present invention, other objects and results of the present invention will become more apparent and easy to understand. In the accompanying drawings:

[0030] Figure 1 It is a schematic diagram of an existing sealing structure based on a slider;

[0031] Figure 2 A schematic diagram of a sealing structure based on a sacrificial material according to an embodiment of the present invention;

[0032] Figure 3Schematic diagram of a sealing method based on sacrificial material according to an embodiment of the present invention.

[0033] Reference numerals include:

[0034] 1. sacrificial material, 11. avoidance structure, 12. first side wall, 13. second side wall;

[0035] 2. Inserts;

[0036] 3. rear mold, 31. groove, 32. inclined wall, 33. first convex body, 34. second convex body, 35. connector;

[0037] 4. Front mold, 5. Injection molded product, 6. Slider, 7. Avoidance space.

[0038] The same reference numerals throughout the drawings indicate similar or corresponding features or functions. DETAILED DESCRIPTION

[0039] In the following description, for the purpose of illustration, in order to provide a comprehensive understanding of one or more embodiments, many specific details are set forth. However, it is apparent that these embodiments may also be implemented without these specific details. In other examples, for ease of describing one or more embodiments, known structures and devices are shown in the form of block diagrams.

[0040] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0041] At present, many products require the use of a collision slider or a four-sided slider structure during injection molding. Figure 1The slider 6 in the figure is a common slider structure. At position A, the slider 6 is sealed with the insert 2 through cooperation. However, since the tolerance of the insert 2 is usually difficult to control, the slider 6 cannot guarantee that the insert 2 can be fully squeezed, and the fluidity of the silicone is extremely strong (a gap of 0.005mm will cause glue overflow), so it is difficult to avoid the glue overflow problem. In addition, structures such as the butting slider and the four-sided slider have high requirements for fitter mold matching. Once the butting slider or the four-sided slider has insufficient machining accuracy or during actual operation, the butting slider or the four-sided slider may have defects due to operational collision, which may easily cause silicone glue overflow at the joints. It is difficult to achieve stable mass production of such structures. Therefore, the present invention proposes a sealing structure and a sealing method based on sacrificial materials.

[0042] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0043] In order to illustrate the specific structure of the sealing structure based on the sacrificial material provided by the present invention; Figure 2 The planar structure of the sealing structure based on the sacrificial material according to the embodiment of the present invention is shown.

[0044] like Figure 2 As shown, the sealing structure based on sacrificial material provided by the present invention includes: a sacrificial material 1, an insert 2 attached to the sacrificial material 1, and a rear mold 3, wherein a groove 31 for accommodating the sacrificial material 1 is provided in the rear mold 3, and the insert 2 is provided on the rear mold and close to one side of the groove 31. When the sacrificial material 1 is embedded in the groove 31, the sacrificial material 1 squeezes the insert 2, and an avoidance structure 11 is provided on one side of the sacrificial material 1 attached to the insert 2 and at a position corresponding to the rear mold 3, and the avoidance structure 11 is used to provide deformation space for the sacrificial material 1.

[0045] In the embodiment of the present invention, the sacrificial material 1 is replaced Figure 1 The slider in the mold utilizes the cooperation between the sacrificial material 1 and the rear mold 3 to press the sacrificial material 1 to the bottom of the groove 31 by the Z-direction force of the mold closing, and convert the interference into the sealing force in the X and Y directions, so as to achieve the purpose of sealing, thereby solving the problem of overflow of glue and burrs on the slider clamp when using a collision slider or a four-sided slider structure for sealing during the injection molding process.

[0046] It should be noted that the sacrificial material 1 in the present invention can be understood as an insert, a slider or a top block, as long as it can achieve the purpose of sealing by converting the Z-direction force of the mold into the sealing force in the X and Y directions.

[0047] In addition, an avoidance structure 11 is provided on the side where the sacrificial material 1 is attached to the insert 2 and at a position corresponding to the rear mold 3. When the sacrificial material 1 is pressed by the Z-direction force of the mold, the sacrificial material 1 will be squeezed in the groove 31. In order to avoid the sacrificial material 1 or the rear mold 3 being squeezed and damaged during the extrusion process, the avoidance structure 11 is provided on the sacrificial material 1. When the sacrificial material 1 is squeezed by the Z-direction force, it can be deformed to a certain extent at the avoidance structure to avoid hard extrusion of the sacrificial material 1 and the groove 31. Therefore, the material of the sacrificial material 1 is required to be deformed to a certain extent while ensuring a certain hardness. The specific material type can be selected according to the actual situation, and no further elaboration is made here.

[0048] In an embodiment of the present invention, the sacrificial material 1 has a first side wall 12 inclined away from the insert 2 along a first direction and a second side wall 13 in contact with the side of the insert 2; when the sacrificial material 1 is initially embedded in the groove 31, a gap is provided between the second side wall 13 and the insert 2 and the rear mold 3; that is, a gap is provided between the side of the sacrificial material 1 provided with the avoidance structure 11 and the insert 2 and the rear mold 3, so that the sacrificial material 1 is easy to enter when it just enters the groove 31, so as to ensure that the sacrificial material 1 can be completely placed in the groove 31 of the rear mold 3 later. When the sacrificial material 1 is embedded in the groove 31, the second side wall 13 of the sacrificial material 1 continuously approaches and squeezes the insert 2, and the vertical pressure is converted into an extrusion force on the insert 2 through the first side wall 12 of the sacrificial material 1, thereby achieving the purpose of sealing.

[0049] Wherein, an inclined wall 32 adapted to the first side wall is arranged at a position corresponding to the groove 31 and the first side wall 12. An interference fit is arranged between the inclined wall 32 and the first side wall 12, and the extrusion force generated by the interference fits the second side wall 13 onto the insert 2 to ensure that the sacrificial material 1 can be tightly attached to the insert 2 after the mold is closed.

[0050] It should be noted that, combined with Figure 2 , the first direction shown is the vertical direction, and the horizontal distance between the sacrificial material 1 and the side wall of the rear mold 3 close to the insert 2 gradually decreases from top to bottom in the vertical direction, so that when the sacrificial material 1 is subjected to Z-direction pressure, the sacrificial material 1 is converted into horizontal force.

[0051] exist Figure 2In the illustrated embodiment, the rear mold 3 is provided with a first convex body 33 and a second convex body 34 respectively on both sides of the groove 31, a connector 35 is provided between the first convex body 33 and the second convex body 34, the first convex body 33, the second convex body 34 and the connector 35 enclose the groove 31, and the first convex body 33 is higher than the second convex body 34. In addition, the insert 2 is provided on the second convex body 33, and the top surface of the insert 2 is higher than the top surface of the first convex body 22. Before the mold is closed, the sacrificial material 1 is in contact with the insert 2 and the rear mold 3, and the top surface of the sacrificial material 1 is higher than the top surface of the first convex body 2.

[0052] That is to say, the part where the first convex body 33 fits with the sacrificial material 1 is the inclined wall 32, which is arranged on the first convex body 33, the part where the sacrificial material 1 fits with the first convex body 33 is the first side wall 12, and the position where the first convex body 33 fits with the sacrificial material 1 is provided with an interference; the second convex body 34 is aligned with the insert 2 and corresponds to the second side wall 13 of the sacrificial material 1, and a gap D is provided between the second convex body 34 and the insert 2 and the second side wall 13, and the interference between the first convex body 33 and the sacrificial material 1 is determined by the gap value, and during the mold closing process, the interference between the first convex body 33 and the sacrificial material 1 is converted into the sealing force of the sacrificial material 1 to extrude the insert. Therefore, this design structure of the rear mold 3 enables the first convex body 33 to provide a stable and reliable thrust for the sacrificial material 1 so that the sacrificial material 1 extrude the insert 2.

[0053] It should be further explained that the first protrusion 33 is higher than the second protrusion 34 . When the sacrificial material 1 is embedded in the groove 31 , the portion of the first protrusion 33 that is higher than the second protrusion 34 can also generate extrusion pressure on the sacrificial material 1 to ensure that the sacrificial material can provide sufficient extrusion pressure on the insert 2 .

[0054] like Figure 2 As shown, the sealing structure based on sacrificial material provided by the present invention further includes a front mold 4, wherein the front mold 4 is used to mold the molded product 5 with the insert 2, the sacrificial material 1 and the rear mold 3. That is to say, after the mold is closed, the sacrificial material 1 fits with the insert 2, the molded product 5, the front mold 4 and the rear mold 3, and the top surface of the sacrificial material 1 and the top surface of the first convex body 33 are located on the same plane, and the molded product 5 fits with the insert 1 and the second side wall 13 of the sacrificial material 1.

[0055] The sacrificial material 1 is in contact with the insert 2 and the rear mold 3 before mold closing. The sacrificial material is in contact with the rear mold 3, the insert 2, the injection molded product 5 and the front mold 4 after mold closing. After mold closing, the avoidance structure 11 and the avoidance space 7 in the groove 31 provide deformation space for the sacrificial material 1, so that the sacrificial material 1 completely enters the groove 31, and the sacrificial material 1 squeezes the insert 2, thereby achieving the purpose of sealing.

[0056] Corresponding to the above structure, the present invention also provides a sealing method based on sacrificial material. Figure 3 The flowchart of the sealing method based on sacrificial material according to an embodiment of the present invention is shown.

[0057] like Figure 3 As shown, the sealing method based on sacrificial material provided by the present invention adopts the above-mentioned sealing structure based on sacrificial material to perform sealing, and the method includes:

[0058] S1: before closing the mold, placing a sacrificial material into the groove of the rear mold, wherein a portion of the sacrificial material is sunk into the groove, and a gap is provided between the sacrificial material and the insert and the rear mold;

[0059] S2: When the mold is closed, the sacrificial material is completely squeezed into the groove under the action of the mold closing force;

[0060] S3: After the mold is closed, the sacrificial material is attached to the insert by the extrusion force generated by the interference between the first side wall of the sacrificial material and the inclined wall of the groove, so as to achieve sealing adhesion between the sacrificial material and the insert.

[0061] In step S1, when part of the sacrificial material is sunk into the groove, the length of the sacrificial material sunk into the groove is L, and the height of the sacrificial material is H, wherein L:H≥2:3, so as to prevent the sacrificial material from falling during the mold closing process.

[0062] According to the tolerance between the insert and the sacrificial material, the clearance value between the sacrificial material and the insert and the rear mold is determined to ensure that the sacrificial material can be safely placed in the groove in the rear mold during the rear mold process.

[0063] In step S3, the interference between the inclined first side wall and the inclined wall of the groove is determined according to the gap value to ensure that the sacrificial material can be tightly attached to the insert after mold closing, thereby playing a sealing role.

[0064] In addition, it should be noted that an avoidance structure is provided on the side where the sacrificial material is in contact with the insert and at a position corresponding to the rear mold. The avoidance structure is used to provide deformation space for the sacrificial material during the sealing process, so that the sacrificial material can completely enter the groove.

[0065] In an embodiment of the present invention, after the sacrificial material is placed in the groove of the rear mold, the sacrificial material cannot be placed to the bottom due to the interference of the inclined surface. The sacrificial material is pressed to the bottom of the groove through the Z-direction force of the mold closing, and the interference is converted into sealing force in the X and Y directions, thereby achieving the purpose of sealing.

[0066] The sealing method based on sacrificial materials refers to the aforementioned embodiments. Since the sealing method based on sacrificial materials adopts all the technical solutions of all the aforementioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the aforementioned embodiments, which will not be described one by one here.

[0067] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A sealing structure based on sacrificial material, characterized in that: include: A sacrificial material, an insert attached to the sacrificial material, and a rear mold, wherein: A groove for accommodating the sacrificial material is provided in the rear mold, and the insert is provided on the rear mold and close to one side of the groove. When the sacrificial material is embedded in the groove, the sacrificial material squeezes the insert. A avoidance structure is provided at a position corresponding to the rear mold on a side where the sacrificial material is in contact with the insert, and the avoidance structure is used to provide a deformation space for the sacrificial material.

2. The sealing structure based on sacrificial material according to claim 1, characterized in that: The sacrificial material has a first side wall inclined away from the insert along a first direction and a second side wall in contact with the side edge of the insert; When the sacrificial material is initially embedded in the groove, a gap is provided between the second side wall and the insert and the rear mold; When the sacrificial material is embedded in the groove, the second side wall of the sacrificial material continuously approaches and presses the insert.

3. The sealing structure based on sacrificial material according to claim 2, characterized in that: An inclined wall matched with the first side wall is arranged at a position of the groove corresponding to the first side wall.

4. The sealing structure based on sacrificial material according to claim 3, characterized in that: An interference is provided between the first side wall and the inclined wall, and the second side wall is pressed and fitted onto the insert by the extrusion force generated by the interference.

5. The sealing structure based on sacrificial material according to claim 2, characterized in that: The rear mold is provided with a first convex body and a second convex body on both sides of the groove, respectively. A connecting body is provided between the first convex body and the second convex body. The first convex body, the second convex body and the connecting body enclose the groove, and the first convex body is higher than the second convex body.

6. The sealing structure based on sacrificial material according to claim 5, characterized in that: The insert is disposed on the second convex body, and the top surface of the insert is higher than the top surface of the first convex body, and Before the mold is closed, the sacrificial material part is in contact with the insert and the rear mold, and the top surface of the sacrificial material is higher than the top surface of the first convex body.

7. The sealing structure based on sacrificial material according to claim 1, characterized in that: Also includes a front mold, wherein The front mold is used to form an injection molded product after being molded together with the insert, the sacrificial material and the rear mold; After mold closing, the sacrificial material fits with the insert, the injection molded product, the front mold and the back mold, and the top surface of the sacrificial material and the top surface of the first convex body are located on the same plane, and the injection molded product fits with the insert and the sacrificial material.

8. A sealing method based on sacrificial material, characterized in that: The method of sealing the adhesive using the sealing structure based on sacrificial material according to any one of claims 1 to 7 comprises: Before closing the mold, a sacrificial material is placed in the groove of the rear mold, wherein a portion of the sacrificial material is sunk into the groove, and a gap is provided between the sacrificial material and the insert and the rear mold; When the mold is closed, the sacrificial material is completely squeezed into the groove under the action of the mold closing force; After the mold is closed, the sacrificial material is attached to the insert by the extrusion force generated by the interference between the first side wall of the sacrificial material and the inclined wall of the groove, so as to achieve sealing adhesion between the sacrificial material and the insert.

9. The sealing method based on sacrificial material according to claim 8, characterized in that: During the process in which the sacrificial material partially sinks into the groove, The length of the sacrificial material sunk into the groove is L, and the height of the sacrificial material is H, wherein L:H≥2:

3.

10. The sealing method based on sacrificial material according to claim 9, characterized in that: According to the tolerance of the insert and the sacrificial material, the gap value between the sacrificial material and the insert and the rear mold is determined.

11. The sealing method based on sacrificial material according to claim 10, characterized in that: According to the clearance value, an interference amount between the inclined first side wall and the inclined wall of the groove is determined.

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