Sealing structures and sealing methods based on sacrificial materials

Abstract

This invention provides a sealing structure and method based on sacrificial material. The sealing structure includes a sacrificial material, an insert, and a rear mold. A groove for accommodating the sacrificial material is provided within the rear mold. The insert is disposed on the rear mold near the groove. When the sacrificial material is embedded in the groove, it compresses the insert. A clearance structure is provided on the side of the sacrificial material that contacts the insert, corresponding to the rear mold. This clearance structure provides deformation space for the sacrificial material. This invention solves the problems of excess glue and burrs at the slider joints that easily occur when using opposing sliders or four-sided slider structures for sealing during injection molding.

Description

Technical Field

[0001] This invention relates to the field of mold injection molding technology, and in particular to a sealing structure and sealing method based on sacrificial materials. Background Technology

[0002] Many products require the use of opposing sliders or four-sided sliders during injection molding. Figure 1 The slider 6 in the design is a common slider structure. At position A, sealing is achieved through the fit between slider 6 and insert 2. However, since the tolerance of insert 2 is usually difficult to control, slider 6 cannot guarantee sufficient compression of insert 2. Furthermore, silicone has extremely high fluidity (overflow will occur even with a gap of 0.005mm), making it difficult to avoid overflow. In addition, structures such as contact sliders and four-sided sliders require high precision in mold making. If the machining accuracy of contact sliders or four-sided sliders is insufficient, or if defects are caused by collisions during actual operation, silicone overflow is likely to occur at the joints. Such structures are difficult to mass-produce stably. Summary of the Invention

[0003] In view of the above problems, the purpose of this invention is to provide a sealing structure and sealing method based on sacrificial materials, so as to solve the problem of glue overflow and burrs at the slider clamping point that are easy to cause when using a collision slider or a four-sided slider structure for sealing during injection molding.

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

[0005] A groove for accommodating the sacrificial material is provided within the rear mold. The insert is disposed on the rear mold and located near the groove. When the sacrificial material is embedded in the groove, it compresses the insert.

[0006] An abutment structure is provided on the side of the sacrificial material that is in contact with the insert and at a position corresponding to the rear mold. The abutment structure is used to provide deformation space for the sacrificial material.

[0007] Furthermore, in a preferred embodiment, the sacrificial material has a first sidewall inclined away from the insert in a first direction and a second sidewall that abuts against the side of the insert;

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

[0009] As the sacrificial material is embedded in the groove, the second sidewall of the sacrificial material continuously approaches and presses against the insert.

[0010] Furthermore, a preferred embodiment is to provide an inclined wall adapted to the first sidewall at a position corresponding to the groove.

[0011] Furthermore, a preferred embodiment is that an interference fit is provided between the first sidewall and the inclined wall, and the extrusion force generated by the interference fit is used to press the second sidewall against the insert.

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

[0013] Furthermore, in a preferred embodiment, the insert is disposed on the second protrusion, and the top surface of the insert is higher than the top surface of the first protrusion.

[0014] Furthermore, in a preferred embodiment, before mold closing, the sacrificial material 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 protrusion.

[0015] Furthermore, a preferred embodiment includes a front mold, wherein,

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

[0017] Furthermore, in a preferred embodiment, the sacrificial material is fitted to the rear mold, the insert, the injection molded product, and the front mold after the mold is closed.

[0018] After the mold is closed, the sacrificial material is in contact with the insert, the injection molded product, the front mold, and the rear mold. Furthermore, the top surface of the sacrificial material and the top surface of the first protrusion are located on the same plane, and the injection molded product is in contact with the insert and the sacrificial material.

[0019] The present invention also provides a sealing method based on sacrificial materials, wherein the sealing is performed using the above-mentioned sealing structure based on sacrificial materials, and the method includes:

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

[0021] During mold closing, 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 adhered to the insert by the extrusion force generated by the interference between the first sidewall of the sacrificial material and the inclined wall of the groove, so as to achieve the sealing and bonding of the sacrificial material and the insert.

[0023] Furthermore, a preferred embodiment is that during the process of the sacrificial material partially sinking into the groove,

[0024] The length of the sacrificial material embedded in the groove is L, and the height of the sacrificial material is H, where L:H≥2:3.

[0025] Furthermore, a preferred approach is to determine the gap value between the sacrificial material, the insert, and the rear mold based on the tolerances of the insert and the sacrificial material.

[0026] Furthermore, a preferred approach is to determine the interference amount between the inclined first sidewall and the inclined wall of the groove based on the gap value.

[0027] As can be seen from the above technical solution, the sealing structure and sealing method based on sacrificial material provided by the present invention assists in sealing by using sacrificial material. An interference fit is provided between the inclined wall of the groove of the rear mold and the first side wall (inclined structure) of the sacrificial material. After the sacrificial material is placed into 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 Z-axis force of the mold closing force presses the sacrificial material to the bottom of the groove, converting the interference fit into sealing force in the X and Y directions, thereby achieving the purpose of sealing. This solves the problem of overflow and burrs at the slider clamping point when using a collision slider or four-sided slider structure for sealing in the injection molding process.

[0028] To achieve the foregoing and related objectives, one or more aspects of the invention include the features that will be described in detail below. The following description and accompanying drawings illustrate certain exemplary aspects of the invention. However, these aspects indicate only a few of the various ways in which the principles of the invention can be used. Furthermore, the invention is intended to encompass all such aspects and their equivalents. Attached Figure Description

[0029] Other objects and results of the invention will become more apparent and readily understood with reference to the following description taken in conjunction with the accompanying drawings. In the drawings:

[0030] Figure 1 A schematic diagram of an existing slider-based sealing structure;

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

[0032] Figure 3This is a schematic diagram of a sealing method based on sacrificial materials according to an embodiment of the present invention.

[0033] The reference numerals in the figures include:

[0034] 1. Sacrificial material; 11. Avoidance structure; 12. First sidewall; 13. Second sidewall;

[0035] 2. Inserts;

[0036] 3. Rear mold; 31. Groove; 32. Sloping wall; 33. First protrusion; 34. Second protrusion; 35. Connecting body;

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

[0038] In all the accompanying drawings, the same reference numerals indicate similar or corresponding features or functions. Detailed Implementation

[0039] In the following description, numerous specific details are set forth for illustrative purposes and to provide a thorough understanding of one or more embodiments. However, it will be apparent that these embodiments may also be implemented without these specific details. In other instances, well-known structures and devices are shown in block diagram form for ease of description of one or more embodiments.

[0040] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] Currently, many products require the use of opposing sliders or four-sided sliders during injection molding. Figure 1The slider 6 in the design is a common slider structure. At position A, sealing is achieved through the cooperation between slider 6 and insert 2. However, since the tolerance of insert 2 is usually difficult to control, slider 6 cannot guarantee sufficient compression of insert 2. Furthermore, silicone has extremely high fluidity (overflow will occur even with a gap of 0.005mm), making it difficult to avoid overflow. In addition, structures such as contact sliders and four-sided sliders require high precision in mold making. If the machining accuracy of contact sliders or four-sided sliders is insufficient, or if defects are caused by collisions during actual operation, silicone overflow is likely to occur at the joints. Such structures are difficult to achieve stable mass production. Therefore, this invention proposes a sealing structure and sealing method based on sacrificial materials.

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

[0043] To illustrate the specific structure of the sealing structure based on sacrificial materials provided by the present invention; Figure 2 A planar structure of a sealing structure based on a sacrificial material is shown according to an embodiment of the present invention.

[0044] like Figure 2 As shown, the sealing structure based on sacrificial material provided by the present invention includes: sacrificial material 1, insert 2 attached to the sacrificial material 1, and rear mold 3. A groove 31 for accommodating the sacrificial material 1 is provided in the rear mold 3. The insert 2 is disposed on the rear mold and close to the groove 31. When the sacrificial material 1 is embedded in the groove 31, the sacrificial material 1 compresses the insert 2. An avoidance structure 11 is provided on the side of the sacrificial material 1 that is attached to the insert 2 and at a position corresponding to the rear mold 3. The avoidance structure 11 provides deformation space for the sacrificial material 1.

[0045] In an embodiment of the present invention, sacrificial material 1 is replaced Figure 1 The slider in the mold uses 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-axis force of the mold closing, and converts the interference into the sealing force in the X and Y directions, thereby achieving the purpose of sealing. This solves the problem of overflow and burrs at the slider clamping point that are easy to cause when using the anti-collision slider or four-sided slider structure for sealing in the injection molding process.

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

[0047] Additionally, a clearance structure 11 is provided on the side of the sacrificial material 1 that is in contact with the insert 2 and at a position corresponding to the rear mold 3. During the Z-axis compression of the sacrificial material 1 by the mold closing force, the sacrificial material 1 is compressed within the groove 31. To prevent the sacrificial material 1 or the rear mold 3 from being crushed during the compression process, the clearance structure 11 is provided on the sacrificial material 1. When the sacrificial material 1 is compressed by the Z-axis force, it can deform to a certain extent at the clearance structure to avoid hard compression between the sacrificial material 1 and the groove 31. Therefore, the material of the sacrificial material 1 is required to ensure a certain degree of hardness while also allowing for a certain degree of deformation. The specific material type can be selected according to the actual situation, and will not be elaborated further here.

[0048] In an embodiment of the present invention, the sacrificial material 1 has a first sidewall 12 inclined away from the insert 2 along a first direction and a second sidewall 13 that fits against the side of the insert 2. When the sacrificial material 1 is initially inserted into the groove 31, a gap is provided between the second sidewall 13 and the insert 2 and the rear mold 3. That is, a gap is provided between the side of the sacrificial material 1 where the clearance structure 11 is provided and the insert 2 and the rear mold 3, so that the sacrificial material 1 can easily enter the groove 31 when it first enters, ensuring that the sacrificial material 1 can be completely placed into the groove 31 of the rear mold 3 later. When the sacrificial material 1 is inserted into the groove 31, the second sidewall 13 of the sacrificial material 1 continuously approaches and squeezes the insert 2, and the vertical pressure is converted into a squeezing force on the insert 2 through the first sidewall 12 of the sacrificial material 1, thereby achieving the purpose of sealing.

[0049] Specifically, a sloping wall 32, adapted to the first sidewall, is provided at a position corresponding to the groove 31 and the first sidewall 12. The sloping wall 32 and the first sidewall 12 are provided with an interference fit. The extrusion force generated by the interference fit presses the second sidewall 13 against the insert 2, so as to ensure that the sacrificial material 1 can be tightly attached to the insert 2 after mold closing.

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

[0051] exist Figure 2In the illustrated embodiment, the rear mold 3 has a first protrusion 33 and a second protrusion 34 on both sides of the groove 31, and a connecting body 35 is provided between the first protrusion 33 and the second protrusion 34. The first protrusion 33, the second protrusion 34, and the connecting body 35 surround and form the groove 31, and the first protrusion 33 is higher than the second protrusion 34. Furthermore, the insert 2 is disposed on the second protrusion 33, and the top surface of the insert 2 is higher than the top surface of the first protrusion 22. Before mold closing, 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 protrusion 2.

[0052] In other words, the part of the first protrusion 33 that contacts the sacrificial material 1 is the inclined wall 32, which is set on the first protrusion 33. The part of the sacrificial material 1 that contacts the first protrusion 33 is the first side wall 12, and the position where the first protrusion 33 contacts the sacrificial material 1 is provided with an interference fit. The second protrusion 34 is aligned with the insert 2 and corresponds to the second side wall 13 of the sacrificial material 1. A gap D is provided between the second protrusion 34, the insert 2, and the second side wall 13, and the interference fit between the first protrusion 33 and the sacrificial material 1 is determined by the gap value. During the mold closing process, the interference fit between the first protrusion 33 and the sacrificial material 1 is converted into the sealing force of the sacrificial material 1 pressing the insert. Therefore, this design structure of the rear mold 3 enables the first protrusion 33 to provide a stable and reliable thrust for the sacrificial material 1, so that the sacrificial material 1 presses 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 part of the first protrusion 33 that is higher than the second protrusion 34 can also generate extrusion force on the sacrificial material 1 to ensure that the sacrificial material can provide sufficient extrusion force on the insert 2.

[0054] like Figure 2 As shown, the sealing structure based on sacrificial material provided by the present invention also includes a front mold 4, wherein the front mold 4 is used to mold and inject product 5 together with the insert 2, the sacrificial material 1 and the rear mold 3. That is, after mold closing, the sacrificial material 1 is in contact with the insert 2, the injection product 5, the front mold 4 and the rear mold 3, and the top surface of the sacrificial material 1 is located on the same plane as the top surface of the first protrusion 33, and the injection product 5 is in contact with the second sidewall 13 of the insert 1 and the sacrificial material 1.

[0055] Before mold closing, the sacrificial material 1 is in contact with the insert 2 and the rear mold 3. After mold closing, the sacrificial material fits into the rear mold 3, the insert 2, the injection molded product 5, and the front mold 4. After mold closing, the clearance structure 11 and the clearance space 7 within the groove 31 provide deformation space for the sacrificial material 1, allowing the sacrificial material 1 to completely enter the groove 31 and compress 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 materials. Figure 3 A sealing method flow based on sacrificial materials according to an embodiment of the present invention is shown.

[0057] like Figure 3 As shown, the sealing method based on sacrificial materials provided by the present invention uses the above-mentioned sealing structure based on sacrificial materials for sealing. The method includes:

[0058] S1: Before mold closing, the sacrificial material is placed into the groove of the rear mold, wherein a portion of the sacrificial material is embedded in the groove, and a gap is provided between the sacrificial material and the insert and the rear mold;

[0059] S2: During mold closing, 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 adhered to the insert by the extrusion force generated by the interference between the first sidewall of the sacrificial material and the inclined wall of the groove, so as to achieve the sealing and bonding of the sacrificial material and the insert.

[0061] In step S1, during the process of the sacrificial material partially sinking into the groove, the length of the sacrificial material sinking into the groove is L, and the height of the sacrificial material is H, where L:H≥2:3, to prevent the sacrificial material from falling off during the mold closing process.

[0062] Specifically, based on the tolerances of the insert and the sacrificial material, the gap value between the sacrificial material, the insert, and the rear mold is determined to ensure that the sacrificial material can be safely placed into the groove inside the rear mold during the rear mold process.

[0063] In step S3, the interference between the inclined first sidewall 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 a clearance structure is provided on the side of the sacrificial material that is in contact with the insert and at a position corresponding to the rear mold. The clearance structure is used to provide deformation space for the sacrificial material during the sealing process, so that the sacrificial material can be completely inserted into the groove.

[0065] In an embodiment of the present invention, after the sacrificial material is placed into the groove of the rear mold, the sacrificial material cannot be placed to the bottom due to the interference of the inclined plane. 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.

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

[0067] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made under the concept of the present invention using the description and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A sealing structure based on sacrificial materials, characterized in that, include: The sacrificial material, the insert attached to the sacrificial material, and the rear mold, wherein, A groove for accommodating the sacrificial material is provided within the rear mold. The insert is disposed on the rear mold and near the groove. When the sacrificial material is embedded in the groove, it compresses the insert. An abutment structure is provided on the side of the sacrificial material that is in contact with the insert and at a position corresponding to the rear mold. The abutment structure is used to provide deformation space for the sacrificial material. The sacrificial material has a first sidewall that is inclined away from the insert in a first direction and a second sidewall that is in contact with the side of the insert. When the sacrificial material is initially embedded in the groove, a gap is provided between the second sidewall and the insert and the rear mold; When the sacrificial material is embedded in the groove, the second sidewall of the sacrificial material continuously approaches and squeezes the insert; The rear mold is provided with a first protrusion and a second protrusion on both sides of the groove, and a connecting body is provided between the first protrusion and the second protrusion. The first protrusion, the second protrusion and the connecting body surround and form the groove, and the first protrusion is higher than the second protrusion. The insert is disposed on the second protrusion, and the top surface of the insert is higher than the top surface of the first protrusion. Before mold closing, 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 protrusion. After mold closing, the top surface of the sacrificial material and the top surface of the first protrusion are located on the same plane.

2. The sealing structure based on sacrificial materials according to claim 1, characterized in that, An inclined wall adapted to the first sidewall is provided at the position corresponding to the groove and the first sidewall.

3. The sealing structure based on sacrificial materials according to claim 2, characterized in that, An interference fit is provided between the first sidewall and the inclined wall, and the extrusion force generated by the interference fit presses the second sidewall against the insert.

4. The sealing structure based on sacrificial materials according to claim 1, characterized in that, It also includes the front mold, among which, The front mold is used to form an injection molded product after being closed with the insert, the sacrificial material and the rear mold; After the mold is closed, the sacrificial material is attached to the insert, the injection molded product, the front mold, and the rear mold, and the injection molded product is attached to the insert and the sacrificial material.

5. A sealing method based on sacrificial materials, characterized in that, Sealing is performed using a sacrificial material-based sealing structure as described in any one of claims 1-4, the method comprising: Before mold closing, the sacrificial material is placed into the groove of the rear mold, wherein part of the sacrificial material is embedded in the groove, and a gap is provided between the sacrificial material and the insert and the rear mold; During mold closing, 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 adhered to the insert by the extrusion force generated by the interference between the first sidewall of the sacrificial material and the inclined wall of the groove, so as to achieve the sealing and bonding of the sacrificial material and the insert.

6. The sealing method based on sacrificial materials according to claim 5, characterized in that, During the process of the sacrificial material partially sinking into the groove The length of the sacrificial material embedded in the groove is L, and the height of the sacrificial material is H. in, L:H≥2:

3.

7. The sealing method based on sacrificial materials according to claim 6, characterized in that, Based on the tolerances of the insert and the sacrificial material, the gap values ​​between the sacrificial material, the insert, and the rear mold are determined.

8. The sealing method based on sacrificial materials according to claim 7, characterized in that, Based on the gap value, the interference amount between the inclined first sidewall and the inclined wall of the groove is determined.

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