Injection molding method, housing, terminal and support assembly

Abstract

The present invention provides an injection molding method for injection molding a heat-resistant component having an inner hole, wherein the heat-resistant component is supported by a support assembly, and the support assembly includes a first slider and a second slider, and the injection molding method includes: driving the first slider and the second slider to insert into the inner hole, and the depth of the second slider inserted into the inner hole is not less than the depth of the first slider inserted into the inner hole; injection molding the heat-resistant component so that a plastic component is formed on the periphery of the inner hole. The above-mentioned injection molding method supports the inner hole of the heat-resistant component by the first slider and the second slider, and the support is stable, thereby avoiding the inner hole from being compressed and deformed during the injection molding process, and effectively improving the product yield. The depth of the second slider inserted into the inner hole is deeper than the depth of the first slider inserted into the inner hole, which reduces the friction area when the slider is inserted into the inner hole, and ensures the original accuracy of the inner hole. The present invention also provides a shell manufactured by the injection molding method, a terminal having the shell, and a support assembly for implementing the injection molding method.

Description

Technical Field

[0001] The present invention relates to the manufacturing field, and in particular to an injection molding method, a shell manufactured by the injection molding method, a terminal of the shell, and a support component for implementing the injection molding method. Background Art

[0002] In product manufacturing, injection molding of metal parts with defects such as depressions is a common surface processing method. In the prior art, when injection molding of metal parts with holes, generally only one support column is used to support the inner hole. If the size of the support column and the inner hole just matches, when the support column is inserted or pulled out of the inner hole, it is easy to rub the inner hole, causing wear of the inner hole and affecting the quality of the inner hole. For example, for the speaker mounting hole, a large degree of wear of the speaker hole installation will cause uneven speaker installation, further affecting the sound effect. To solve this problem, some manufacturers now reduce the radial size of the support column to reduce the contact area between the support column and the inner hole. However, since the support column is smaller than the inner hole and the supporting force is insufficient, the metal part is prone to offset during high-pressure injection molding, and the stability of the support column is reduced. For metal parts with a relatively close distance between the depression and the inner hole, since the wall thickness between the depression and the inner hole is relatively thin, and the contact area between the support column and the side wall of the inner hole is reduced, when the depression is subjected to high-pressure injection molding, it is easy to cause the side wall of the inner hole that does not contact the support column to deform, seriously affecting the quality of the inner hole and the yield rate of the metal part. Summary of the invention

[0003] In view of the above situation, the present invention provides an injection molding method that can effectively reduce the friction between the support column and the inner hole, a shell manufactured by the injection molding method, a terminal of the shell, and a support component implementing the injection molding method.

[0004] An embodiment of the present invention provides an injection molding method for injection molding a heat-resistant component having an inner hole, wherein the heat-resistant component is supported by a support assembly, wherein the support assembly includes a first slider and a second slider, and the injection molding method includes: driving the first slider to move toward the inner hole so that the first slider and the second slider are inserted into the inner hole, wherein the depth of the second slider inserted into the inner hole is not less than the depth of the first slider inserted into the inner hole; and injection molding the heat-resistant component so that a plastic component is formed around the inner hole.

[0005] Optionally, the step of driving the first slider and the second slider to insert into the inner hole includes: driving the first slider to move toward the inner hole, and linking the second slider to insert into the inner hole; further driving the first slider to slide on the second slider so that the second slider contacts a portion of the inner wall of the inner hole, and the first slider slides into the inner hole and contacts a portion of the inner wall of the inner hole.

[0006] Optionally, the first slider includes a first connecting portion and a first sliding portion bently connected to the first connecting portion, the second slider includes a second connecting portion and a second sliding portion bently connected to the second connecting portion, and the step of driving the first slider to move toward the inner hole and linking the second slider to insert into the inner hole includes: driving the first connecting portion to move the first sliding portion toward the inner hole; further driving the first connecting portion to link the second connecting portion and the second sliding portion to insert one end of the second slider into the inner hole.

[0007] Optionally, the first connecting part is connected to the second connecting part via an elastic member, and the step of further driving the first slider to slide on the second slider includes: further driving the first connecting part to elastically compress the elastic member, thereby linking the first sliding part to slide on the second sliding part.

[0008] Optionally, the first slider includes a first connecting portion and a first sliding portion bently connected to the first connecting portion, the second slider includes a second connecting portion and a second sliding portion bently connected to the second connecting portion, the first connecting portion and the second connecting portion are connected via an elastic member, and the injection molding method further includes: allowing the elastic member between the first connecting portion and the second connecting portion to elastically rebound to link the first sliding portion to slide on the second sliding portion, so that the first slider detaches from the inner hole and the second slider detaches from the inner side wall of the inner hole; and allowing the second slider to detach from the inner hole.

[0009] A shell comprises a heat-resistant component and a plastic component. The heat-resistant component has an inner hole, and the surface roughness of the inner hole is less than Ra0.8; the plastic component fills the periphery of the inner hole.

[0010] Optionally, the heat-resistant component also includes a bottom, a protrusion and a recessed portion, the inner hole of the protrusion is opened in the protrusion; the recessed portion is formed in at least one of the upper surface, outer side surface and periphery of the protrusion, and the plastic component is filled in the recessed portion.

[0011] Optionally, the distance between the inner side wall of the recessed portion and the inner side wall of the inner hole is less than 0.32 mm, and the size error of the inner hole is less than 0.08 mm or the shape error is less than 0.04 mm.

[0012] Optionally, the material of the heat-resistant component is metal with a hardness of 320-340 HV.

[0013] Optionally, the plastic component includes a resin composition including a resin and glass fibers.

[0014] A terminal comprises any one of the above-mentioned shells.

[0015] Optionally, the terminal further includes a sound conversion device, and the inner hole includes a mounting hole and a sound hole: the sound conversion device is mounted on the mounting hole; and the sound hole is communicated with the mounting hole of the sound conversion device.

[0016] A support assembly is used to support a heat-resistant component to be injected and having an inner hole. The heat-resistant component has an inner hole, and the support assembly includes a first slider and a second slider; the first slider includes a first sliding portion and a first supporting portion, and the first supporting portion is arranged on the first sliding portion; the second slider includes a second sliding portion and a second supporting portion, and the two sliding portions are slidably connected to the first sliding portion so that the first supporting portion slides out of one end of the second sliding portion to be inserted into the inner hole; or so that the first supporting portion is reset toward one end of the second sliding portion to be out of the inner hole; the second supporting portion is arranged at one end of the second sliding portion and is used to be inserted into the inner hole; wherein the second supporting portion is not less than the length of the first supporting portion.

[0017] Optionally, the first slider further includes a first connecting portion, which is bent and connected to the first sliding portion; the second slider further includes a second connecting portion, which is bent and connected to the second sliding portion, and the second connecting portion is connected to the first connecting portion via an elastic member.

[0018] The injection molding method and support assembly provided by the present invention support the inner hole of the heat-resistant component through the first slider and the second slider. The double slider support improves the stability of the heat-resistant component during injection molding, and the depth of the second slider inserted into the inner hole is not less than the depth of the first slider inserted into the inner hole, reducing the friction area when the slider is inserted into the inner hole, ensuring the original accuracy of the inner hole, and at the same time avoiding compression deformation of the inner hole during the injection molding process, effectively improving the product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure is a schematic diagram of the three-dimensional structure of a housing according to an embodiment of the present invention.

[0020] Figure 2 This is a partial enlarged view of a shell during injection molding of the present invention.

[0021] Figure 3 It is a three-dimensional schematic diagram of a partial structure of an injection mold embodiment of the present invention.

[0022] Figure 4 for Figure 3 Schematic diagram of the exploded structure of the injection mold shown.

[0023] Figure 5 for Figure 3 Schematic diagram of the cross-sectional structure of the injection mold shown.

[0024] Figure 6 for Figure 3 Schematic diagram of the cross-sectional structure of the injection mold shown.

[0025] Figure 7 It is a partial enlarged view of an injection mold in one embodiment.

[0026] Figure 8 for Figure 3Schematic diagram of the cross-sectional structure of the injection mold shown.

[0027] Fig. 9 for Figure 3 Schematic diagram of the cross-sectional structure of the injection mold in another direction.

[0028] Fig.10 The present invention is a structural block diagram of an injection molding machine according to an embodiment of the present invention.

[0029] Fig.11 The present invention is a flowchart of an injection molding method according to an embodiment of the present invention.

[0030] Fig.12 The present invention is a flowchart of another embodiment of an injection molding method.

[0031] Description of main component symbols:

[0032]

[0033] DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a centered element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may also be a centered element. When an element is considered to be "set on" another element, it may be directly set on the other element or there may also be a centered element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0036] The terms "first", "second", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or components is not necessarily limited to those steps or components that are clearly listed, but may include other steps or components that are not clearly listed or inherent to these processes, methods, products or devices.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more related listed items, "not greater than" means less than or equal to, and "not less than" means greater than or equal to.

[0038] Some embodiments of the present invention are described in detail. In the absence of conflict, the following embodiments and features of the embodiments can be combined with each other.

[0039] Please also read Figure 1 and Figure 2 , Figure 1 is a schematic diagram of the three-dimensional structure of an embodiment of a housing, Figure 2 This is a partial enlarged view of a shell during injection molding of the present invention. The present invention provides a shell 50, which includes a heat-resistant component 51 and a plastic component 52. The heat-resistant component 51 has an inner hole 511, and the surface roughness of the inner hole 511 is less than Ra0.8 (unit: μm). The plastic component 52 is filled in the periphery of the inner hole 511 by injection molding, and the injection molding method is the injection molding method described below.

[0040] The roughness of the shell 50 of the present invention is less than Ra0.8, and the precision is high. Even if the plastic component 52 is filled around the inner hole 511 by injection molding, the roughness can still be kept less than Ra0.8, which is convenient for installing other components in the inner hole 511 and avoiding the influence of high roughness on component installation.

[0041] In one embodiment, the heat-resistant component 51 includes a bottom 514, an inner hole 511, a recessed portion 512, and a raised portion 513. The raised portion 513 is disposed on the bottom 514; the inner hole 511 is opened on the raised portion 513; the recessed portion 512 forms the periphery of the inner hole 511. The plastic component 52 is filled in the recessed portion 512.

[0042] Optionally, in terms of shape, the inner hole 511 can be a square hole, a round hole, or an elliptical hole. The square hole can be a long hole or a square hole. The corners in the square hole can be right angles, or some angles can be non-right angles, for example, the corners at both ends are rounded or chamfered. In terms of function, the inner hole 511 can be a through hole or a blind hole.

[0043] The recessed portion 512 may be formed at least one of the upper surface 5131, the outer side surface 5132, and the periphery 5133 of the raised portion 513. Specifically, the recessed portion 512 may be formed separately on the upper surface, the outer side surface, and the periphery, or may be formed at any two or three of the upper surface 5131, the outer side surface 5132, and the periphery 5133 of the raised portion 513. Optionally, the recessed portions 512 formed at any two or three of the upper surface 5131, the outer side surface 5132, and the periphery 5133 of the raised portion 513 may be interconnected. Optionally, the recessed portion 512 is a defect formed by collision with other parts during processing or transportation. The present invention avoids mismatching between the housing 50 and the components by filling the recessed portion 512 with a plastic component 52. The provision of the plastic component 52 improves the quality of the housing 50.

[0044] In another embodiment, the plastic component 52 can be further coated on the upper surface of the heat-resistant component 51 according to actual needs. Specifically, the plastic component 52 not only fills the concave portion 512, but also covers the end surface of the convex portion 513 and the end surface of the plastic component 52 parallel to the end surface. Furthermore, the plastic component 52 can also be coated on all outer surfaces of the heat-resistant component 51.

[0045] In one embodiment, if Figure 2 , the distance d between the inner wall of the recessed portion 512 and the inner wall of the inner hole 511 is less than 0.32 mm, the size error of the inner hole 511 is less than 0.08 mm or the shape error is less than 0.04 mm, when the inner hole 511 is a square hole, the size error of the inner hole 511 may be a length size error or a width size error, and the shape error may be a flatness error of the inner surface; when the inner hole 511 is a circular hole, the size error of the inner hole 511 may be a radial size error, and the shape error may be a contour error of the inner surface of the circular hole.

[0046] In one embodiment, the heat-resistant component 51 can withstand a temperature of 300-700°C without deformation, and the material of the heat-resistant component 51 can be metal, ceramic, or diamond. The metal can be stainless steel, titanium alloy, or aluminum alloy. When the heat-resistant component 51 is stainless steel, the hardness of the stainless steel is 320-340HV, and 330HV can be selected. Correspondingly, the injection pressure of the injection molding machine (described below) is 75kgf (kilogram force), and the distance between the inner wall of the recessed portion 512 and the inner wall of the inner hole 511 is less than 0.22mm or 0.17mm; the surface roughness of the wall of the inner hole 511 is less than Ra0.6.

[0047] In one embodiment, the plastic component 52 includes a resin composition, which includes a resin and glass fiber, and the glass fiber makes the plastic component 52 have good toughness, drop resistance, corrosion resistance, wear resistance, and bending resistance. The resin can be one or more of polyethylene, polypropylene, polyacetal, polystyrene, modified polyphenylene ether, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyphenylene sulfide, polyimide, polyamide-imide, polyetherimide, polysulfone, polyether sulfone, polyether ketone, polyether ether magnesium, polycarbonate, polyamide, and acrylonitrile-butadiene-styrene copolymer. Preferably, the resin is polybutylene terephthalate.

[0048] The present invention also provides a terminal, which may be a mobile terminal such as a mobile phone, a tablet computer, or a fixed terminal such as a car speaker, an aircraft speaker, or the like.

[0049] The terminal includes a sound conversion device and the housing 50. The inner hole 511 includes a mounting hole 5111 and a sound hole 5112. The sound conversion device is mounted on the mounting hole 5111. The sound hole 5112 communicates with the mounting hole 5111. The sound conversion device can be a speaker or a pickup, and correspondingly, the sound hole 5112 is a speaker hole or a pickup hole.

[0050] The shell 50 of the present invention has a small roughness and high precision, and the speaker and the pickup can be stably installed in the installation hole 5111, thereby reducing the problem that the sound emitted by the speaker cannot flow out completely smoothly to the speaker hole due to uneven installation, and reducing the problem that the external sound cannot be completely smoothly recognized by the pickup due to uneven installation, thereby ensuring the input or output effect of the sound from the sound hole.

[0051] In another embodiment, the terminal further includes an earphone plug, the inner hole 511 further includes an earphone jack, and the earphone plug and the earphone jack are arranged correspondingly.

[0052] The above embodiment briefly introduces the structural features of the housing 50 . Now, the components of the injection molding machine 200 and the manner in which the components of the injection molding machine 200 cooperate with the heat-resistant component 51 supporting the housing 50 will be further described.

[0053] Please also read Figure 3 and Fig.10 , Figure 3 It is a three-dimensional schematic diagram of the partial structure of the injection mold. Fig.10 The present invention further provides an injection molding machine 200, which includes an injection mold 100. The injection molding machine 200 fixes and performs injection molding on the heat-resistant component 51 of any of the above embodiments through the injection mold 100, so that the periphery of the inner hole 511 is formed with the plastic component 52 of any of the above embodiments.

[0054] The injection mold 100 includes a mounting seat (not shown), a support assembly 10, a support seat 20, a guide member 30 and a pushing mechanism 40. The mounting seat is used to mount a heat-resistant component 51, and the mounting seat is elastically connected to the support seat 20; the support assembly 10 is disposed on the support seat 20, and is used to support the heat-resistant component 51; the guide member 30 is disposed on both sides of the support seat 20 and is slidably connected to the support seat 20; the pushing mechanism 40 is used to push the support seat 20 to slide along the guide member 30, and the supporting assembly 10 is inserted into the inner hole 511 to support the heat-resistant component 51, so that the heat-resistant component 51 is clamped between the support assembly 10 and the mounting seat.

[0055] Please also read Figure 4 and Figure 5 , Figure 4 for Figure 3 The exploded structure diagram of the injection mold is shown in FIG. Figure 5 for Figure 3 The cross-sectional structure diagram of the injection mold shown in the figure. The support assembly 10 includes a first slider 11 and a second slider 12. The first slider 11 includes a first sliding portion 111 and a first supporting portion 112. The first supporting portion 112 is arranged at one end of the first sliding portion 111. The second slider 12 includes a second sliding portion 121 and a second supporting portion 122. The second sliding portion 121 is slidably connected to the first sliding portion 111 so that the first supporting portion 112 slides out of one end of the second sliding portion 121 to be inserted into the inner hole 511; the sliding between the second sliding portion 121 and the first sliding portion 111 also resets the first supporting portion 112 toward one end of the second sliding portion 121 to be out of the inner hole. The second supporting portion 122 and the first supporting portion 112 are used to be inserted into the inner hole 511, wherein the length of the second supporting portion 122 is not less than the length of the first supporting portion 112, so that the depth of the second supporting portion 122 inserted into the inner hole 511 is not less than the depth of the first supporting portion 112 inserted into the inner hole 511. In one embodiment, if the inner hole 511 is vertically or horizontally opened in the plastic component 52, the first support portion 112 and the first sliding portion 111 can be vertically or horizontally connected, and correspondingly, the second support portion 122 and the second sliding portion 121 can also be vertically or horizontally connected. Figure 2As shown, if the inner hole 511 is obliquely opened on the plastic component 52 , the first support portion 112 and the first sliding portion 111 can be obliquely connected, and correspondingly, the second support portion 122 and the second sliding portion 121 can also be obliquely connected.

[0056] In one embodiment, the cross-sectional area of ​​the first support portion 112 is smaller than the cross-sectional area of ​​the first sliding portion 111, and similarly, the cross-sectional area of ​​the second support portion 122 is smaller than the cross-sectional area of ​​the second sliding portion 121, wherein the cross-sectional area of ​​the first support portion 112 is perpendicular to the central axis of the first support portion 112, and the cross-sectional area of ​​the second support portion 122 is perpendicular to the central axis of the second support portion 122; the cross-sectional area of ​​the first sliding portion 111 is perpendicular to the central axis of the first sliding portion 111, and the cross-sectional area of ​​the second sliding portion 121 is perpendicular to the central axis of the second sliding portion 121. Optionally, if the inner hole 511 is circular, the diameter of the first support portion 112 is smaller than that of the first sliding portion 111, and similarly, the diameter of the second support portion 122 is smaller than that of the second sliding portion 121; if the inner hole 511 is square, the width and length of the first support portion 112 are both smaller than those of the first sliding portion 111, and similarly, the width and length of the second support portion 122 are both smaller than those of the second sliding portion 121. Furthermore, the cross-sectional area of ​​the second support portion 122 is smaller than the cross-sectional area of ​​the inner hole 511 , and the length of the second support portion 122 is smaller than the depth of the inner hole 511 , so as to prevent the second support portion 122 from scratching the bottom wall of the inner hole 511 when inserted into the inner hole 511 .

[0057] Before the injection molding process is performed, in the initial state, the end surface of the first sliding portion 111 and the end surface of the second sliding portion 121 are not in the same plane, and the second support portion 122 and the first support portion 112 form a certain interval; during the injection molding process, after the second support portion 122 and the first support portion 112 are fully inserted into the inner hole 511 and abut against the inner side wall of the inner hole 511, the end surface of the first sliding portion 111 and the end surface of the second sliding portion 121 are in the same plane to abut against the outer end surface of the inner hole 511, thereby preventing the molten plastic (such as the resin composition) from being The compound) enters the inner hole 511, and the interval between the first support portion 112 and the second support portion 122 is reduced, and the outer dimensions formed by the combination of the first support portion 112 and the second support portion 122 match the dimensions of the inner hole 511. Specifically, if the inner hole 511 is a round hole, the diameter formed by the combination of the first support portion 112 and the second support portion 122 matches the diameter of the round hole; if the inner hole 511 is a square hole, the width and length formed by the combination of the first support portion 112 and the second support portion 122 match the width and length of the square hole. Figure 2When the recessed portion 512 is formed on the upper surface of the heat-resistant component 51 or the upper surface of the raised portion 513, the length of the first support portion 112 is not greater than the depth of the recessed portion 512, so that the first support portion 112 can reduce the friction contact area between the first support portion 112 and the inner wall of the inner hole 511 while meeting the requirement of stable support for the injection pressure, thereby maintaining the original accuracy of the inner hole 511. Of course, in other embodiments, the length of the first support portion 112 can be slightly greater than the depth of the recessed portion 512 within 0.2 mm.

[0058] In one embodiment, the first support portion 112 and the second support portion 122 may both be made of metal material. Optionally, the first support portion 112 and the second support portion 122 may both be made of VIKING steel.

[0059] In one embodiment, the support base 20 is fixedly connected to the first slider 11 by screws and is slidably connected to the second slider 12. The pushing mechanism 40 can be plugged into the support base 20 to push the support base 20 to slide along the guide member 30 and link the first sliding part 111 to slide on the second sliding part 121.

[0060] Before the injection molding of the molten plastic, the end faces of the first sliding portion 111 and the second sliding portion 121 abut against the upper surface of the outer periphery of the inner hole 511 (i.e., the upper surface of the plastic component 52) ​​to prevent the molten plastic from entering the inner hole 511; when the plastic component 52 has a protrusion 513, the end faces of the first sliding portion 111 and the second sliding portion 121 abut against the upper surface of the protrusion 513 to prevent the molten plastic from entering the inner hole 511; the second supporting portion 122 and the first supporting portion 112 are sequentially inserted into the inner hole 511 and abut against part of the inner side wall of the inner hole 511 in turn to prevent the pressure of the molten plastic from deforming the inner side wall of the inner hole 511 during the injection molding process.

[0061] Please also read Figure 1 and Figure 6 , Figure 6 for Figure 3 Schematic diagram of the cross-sectional structure of the injection mold shown. In another embodiment of the present invention, the first slider 11 further includes a first connecting portion 113. The first connecting portion 113 and the first supporting portion 112 are respectively arranged at two ends of the first sliding portion 111, and the first connecting portion 113 is connected to the first sliding portion 111 in a curved manner. The second slider 12 further includes a second connecting portion 123, the second connecting portion 123 and the second supporting portion 122 are respectively arranged at two ends of the second sliding portion 121, and the second connecting portion 123 is connected to the second sliding portion 121 in a curved manner, and the second connecting portion 123 is connected to the first connecting portion 113 through an elastic member 13. The elastic member 13 can be a spring or rubber.

[0062] Please also read Figure 5In one embodiment, the first sliding portion 111 has a protrusion 114, and correspondingly, the second sliding portion 121 also has a slide groove 124, and the protrusion 114 is slidably connected to the slide groove 124. Further, the slidable displacement of the protrusion 114 is equal to the length of the first supporting portion 112.

[0063] Please continue reading Figure 7 In an optional embodiment, the cross-section of the protrusion 114 may be roughly wedge-shaped, and one end of the protrusion 114 (the end close to the first support portion 112) has a sliding slope 1141, and one side of the slide groove 124 has a guiding slope 1241. The sliding slope 1141 slides along the guiding slope 1241 to realize the inclined sliding between the first sliding portion 111 and the second sliding portion 121, wherein, when the injection mold 100 is molded and the elastic member 13 is compressed, the sliding slope 1141 slides to the bottom of the guiding slope 1241, and the interval between the second support portion 122 and the first support portion 112 changes from large to small; when the elastic member 13 is not subjected to force, the elastic reset effect of the elastic member 13 causes the sliding slope 1141 to slide back from the bottom of the guiding slope 1241 to the top of the guiding slope 1241, and the interval between the second support portion 122 and the first support portion 112 changes from small to large.

[0064] In one embodiment, if Figure 4 As shown, the first sliding part 111 and the second sliding part 121 can be two respectively, and the two first sliding parts 111 are connected to form a U shape, and correspondingly, the two second sliding parts 121 are connected to form a U shape, and the protrusions 114 and the sliding grooves 124 are also two respectively; the first supporting part 112 and the second supporting part 122 are at least two or more respectively, wherein the number of the first supporting part 112 and the second supporting part 122 matches the number of the inner holes 511 on the heat-resistant component 51. In another embodiment, the number of the first supporting part 112 and the second supporting part 122 is preferably 3 respectively, which are used to support the mounting hole of the speaker, the mounting hole of the pickup, and the headphone hole respectively. In other embodiments, the number of the first supporting part 112 and the second supporting part 122 can be less than or more than 3, and the present invention is not limited thereto.

[0065] Please also read Figure 4 and Fig. 9 , Fig. 9 for Figure 3 Schematic diagram of the cross-sectional structure of the injection mold in another direction. Furthermore, the connection between the two first sliding parts 111 also has a protrusion 115. The protrusion 115 is arranged between the two protrusions 114. The connection between the two second sliding parts 121 has a groove 126 matching the protrusion 115. The groove 126 is arranged between the two slide grooves 124, and the protrusion 115 is slidably connected with the groove 126. The sliding direction of the protrusion 115 can be horizontal sliding or inclined sliding. Fig. 9As shown, the cross section of the front view of the protrusion 115 can be roughly a trapezoid with a narrow top and a wide bottom, and the shape of the groove 126 matches the shape of the protrusion 115, and the cross section of the groove 126 is also roughly a trapezoid with a narrow top and a wide bottom. After the protrusion 115 is received in the groove 126, the first slider 11 and the second slider 12 can be prevented from separating and falling off, ensuring that the first slider 11 slides relative to the second slider 12.

[0066] See also Figure 8 , Figure 8 for Figure 3 The schematic diagram of the cross-sectional structure of the injection mold is shown. In one embodiment, the second sliding portion 121 has a protrusion 125, and the support seat 20 has a receiving groove 21. The protrusion 125 is slidably arranged in the receiving groove 21 to realize the sliding connection between the second slider 12 and the support seat 20. An elastic object 22 is provided between the workpiece mounting seat and the support seat 20. When the pushing mechanism 40 drives the support seat 20 to move, the elastic object 22 is used to prevent the support seat 20 from directly hitting the workpiece mounting seat and can make the support seat 20 elastically reset. The elastic object 22 can be a spring or rubber. A through groove 24 is provided on the support seat 20, and one end of the pushing mechanism 40 is movably inserted into the through groove 24. Furthermore, the end of the pushing mechanism 40 has an inclined surface, and the thickness of the end of the pushing mechanism 40 gradually decreases toward the end surface, so as to be inserted into the through groove 24, and it is conducive to pushing the support seat 20 to move horizontally or tilting.

[0067] Furthermore, the injection mold 100 also includes a wear-resistant part 41, and the pushing mechanism 40 has a recess 42. The wear-resistant part 41 is arranged in the recess 42. The thickness of the wear-resistant part 41 is not less than the depth of the recess 42. The wear-resistant part 41 is detachably connected to the recess 42 by screws, so that when the pushing mechanism 40 is inserted into the branch groove 24, the pushing mechanism 40 and the support seat 20 are avoided from large-area friction, and the wear of the pushing mechanism 40 is reduced. When the wear-resistant part 41 is worn to a certain extent, the wear-resistant part 41 can be replaced, which has a simple structure, convenient operation, and low replacement cost. The wear-resistant part 41 can be made of one or more metal materials selected from chromium carbide, alloy steel, high manganese steel, and tungsten carbide.

[0068] Please refer again Figure 3 , Figure 4 and Fig. 9In one embodiment, there are two guide members 30, and the two guide members 30 are respectively arranged on the two sides of the support seat 20. The two sides of the support seat 20 are also provided with sliding parts 23, and the guide members 30 have slide rails slidably connected with the sliding parts 23. When the pushing mechanism 40 drives the support seat 20, the sliding part 23 slides along the slide rail. The inclination of the slide rail matches the inclination of the central axis of the inner hole 511, which is conducive to ensuring that the first support part 112 and the second support part 122 are smoothly inserted into the inner hole 511 to avoid scratching the hole wall or damaging the mold. A gasket 25 is also provided at the bottom of the support seat 20 to reduce the wear of the bottom of the support seat 20 and extend the service life of the support seat 20.

[0069] The above embodiment briefly introduces the components of the injection molding machine 200 . Now, the method for each component in the injection molding machine 200 to support the heat-resistant component 51 and injection-mold the housing 50 is further described.

[0070] See also Fig.11 , Fig.11 The present invention further provides an injection molding method for injection molding a heat-resistant component 51 having an inner hole 511 in any of the above embodiments, the heat-resistant component 51 is supported by the support assembly 10, and the injection molding method can be applied to the injection molding machine 200 of any of the above embodiments or a combination of embodiments to form the housing 50 of any of the above embodiments by injection molding. The injection molding method comprises the following steps:

[0071] S1: Move the first slider 11 toward the inner hole so that the first slider 11 and the second slider 12 are inserted into the inner hole 511;

[0072] Specifically, the depth of the second slider 12 inserted into the inner hole 511 is not less than the depth of the first slider 11 inserted into the inner hole, thereby reducing the contact area between the first slider 11 and the inner wall of the inner hole 511, avoiding large-area friction between the inner wall of the inner hole 511 when the first slider 11 is inserted into or pulled out of the inner hole 511, and allowing the inner wall of the inner hole 511 to retain the original surface accuracy over a large area.

[0073] The first slider 11 and the second slider 12 can be driven directly and inserted into the inner hole 511 separately, or the first slider 11 can be driven to insert into the inner hole 511 separately and then the second slider 12 can be driven to insert into the inner hole 511 separately, or the first slider 11 can be driven to drive the second slider 12 to move synchronously so as to insert into the inner hole 511.

[0074] S2 : Injection molding is performed on the heat-resistant component 51 , so that a plastic component 52 is formed around the outer periphery of the inner hole 511 .

[0075] Specifically, after the injection molding machine 200 controls the injection mold 100 to close the mold and injects molten plastic into the heat-resistant component 51 to form the plastic component 52, the plastic component 52 is wrapped around the periphery of the inner hole 511, that is, the outer surface of the heat-resistant component 51, thereby forming the above-mentioned shell 50. In another embodiment, since the heat-resistant component 51 has a recessed portion 512 and a protruding portion 513, and the recessed portion 512 is formed at least one of the upper surface, the outer side surface, and the periphery of the protruding portion 513, after the injection molding machine 200 controls the injection mold 100 to close the mold and injects molten plastic into the heat-resistant component 51 to form the plastic component 52, the plastic component 52 only needs to fill the recessed portion 512.

[0076] In one embodiment, S1: driving the first slider 11 to move toward the inner hole so that the first slider 11 and the second slider 12 are inserted into the inner hole 511 includes the following steps:

[0077] S1.1: driving the first slider 11 to move toward the inner hole 511 of the heat-resistant component 51 , and driving one end of the second slider 12 to be inserted into the inner hole 511 .

[0078] Specifically, before the process of injecting molten plastic, the power of the injection molding machine 200 causes the inclined surface of the pushing mechanism 40 to be inserted into the support seat 20 to drive the support seat 20 to move toward the heat-resistant component 51, and causes the elastic member 22 between the support seat 20 and the workpiece mounting seat to be elastically compressed. Since the first slider 11 is fixed to the support seat 20 by screws, the first slider 11 and the support seat 20 move synchronously. Before the support assembly 10 contacts the heat-resistant component 51, the elastic member 13 is in a naturally extended state, the first slider 11, the second slider 12 and the support seat 20 remain relatively stationary, one end of the second slider 12 (i.e., the second support portion 122) is at the front end position, and one end of the first slider 11 (i.e., the first support portion 112) has not yet slid out of the second slide portion 121. As the support seat 20 continues to move forward, the second support portion 122 is first inserted into the inner hole 511, and the second support portion 122 does not contact the inner side wall of the inner hole 511 during the insertion process. Likewise, as the support base 20 moves toward the heat-resistant component 51 , the elastic member 22 between the support base 20 and the workpiece mounting base is continuously elastically compressed.

[0079] More specifically, when the inclined surface of the pushing mechanism 40 is inserted into the support seat 20, the support seat 20 can be driven to drive the first connecting portion 113 of the first slider 11 to move forward, thereby linking the first sliding portion 111 to move toward the inner hole 511; since the first connecting portion 113 and the second connecting portion 123 are elastically connected through the elastic member 13, the first connecting portion 113 pushes the second connecting portion 123 to move forward through the elastic member 13, so that the second sliding portion 121 moves forward synchronously with the second connecting portion 123 until the end face of the second sliding portion 121 abuts against the end face of the heat-resistant component 51 (i.e., the outer end face of the inner hole 511), and the second support portion 122 is inserted into the inner hole 511.

[0080] S1.2: further drive the first slider 11 to slide on the second slider 12 so that one end of the second slider 12 contacts a portion of the inner wall of the inner hole 511 , and one end of the first slider 11 is inserted into the inner hole 511 and contacts a portion of the inner wall of the inner hole 511 .

[0081] Specifically, the injection molding machine 200 controls the pressure applied by the injection mold 100 to the first sliding part 111, the second sliding part 121 and other components when the injection mold 100 is closed, and the pushing mechanism 40 drives the first connecting part 113 to elastically compress the elastic member 13 between the first connecting part 113 and the second connecting part 123, thereby linking the first sliding part 111 to slide on the second sliding part 121. When the end face of the second sliding portion 121 abuts against the surface of the heat-resistant component 51, that is, when the end face of the second sliding portion 121 abuts against the outer end face of the inner hole 511, the second support portion 122 is completely inserted into the inner hole 511, but temporarily does not contact the inner wall of the inner hole 511. The gap between the second support portion 122 and the inner wall is too small, and the first support portion 112 cannot be inserted. At this time, the support seat 20 and the first connecting portion 113 of the first sliding block 11 continue to move forward under the continuous drive of the pushing mechanism 40, so that the elastic member 13 between the first connecting portion 113 and the second connecting portion 123 is elastically compressed, thereby linking the protrusion 114 of the first sliding portion 111 to slide forward along the slide groove 124 of the second sliding portion 121, and the protrusion 125 slides toward the front side wall of the receiving groove 21. When the protrusion 114 slides to the end of the slide groove 124 and the front end surface of the protrusion 125 moves to the front side wall of the receiving groove 21, the first sliding part 111 slightly tilts and moves forward to slide the second support part 122 of the second sliding part 121 down and abut against part of the inner wall of the inner hole 511, so that the first support part 112 of the first sliding part 111 has enough clearance to insert into the inner hole 511 and abut against part of the inner wall of the inner hole 511, wherein, when the end face of the first sliding part 111 abuts against the upper surface of the heat-resistant component 51, that is, when the end face of the first sliding part 111 abuts against the outer end face of the inner hole 511, the sliding displacement of the protrusion 114 is equal to the length of the first support part 112. Thus, the first support portion 112 and the second support portion 122 are jointly inserted into the inner hole 511 and support the inner wall of the inner hole 511 to prevent the inner wall of the inner hole 511 from being deformed during the injection molding process, and the end faces of the first sliding portion 111 and the second sliding portion 121 jointly seal the outer end face of the inner hole 511 to prevent the molten plastic from entering the inner hole 511 during the injection molding process.

[0082] The above-mentioned injection molding method is to explain the movement process of each component of the injection mold 100 when the injection molding machine 200 is molded to inject the heat-resistant component 51. Now, the movement process of each component of the injection mold 100 when the injection molding machine 200 is demolded is further introduced.

[0083] See also Fig.12 , Fig.12This is a flow chart of another embodiment of an injection molding method of the present invention. In one embodiment, the injection molding method of the present invention further comprises:

[0084] S3: elastically reset the elastic member 13 between the first connection portion 113 and the second connection portion 123 to link the first sliding portion 111 to slide on the second sliding portion 121 , so that the first sliding block 11 is separated from the inner hole 511 , and the second sliding block 12 is separated from the inner wall of the inner hole 511 .

[0085] Specifically, after the injection of the molten plastic is completed, the mold is opened, and the pushing mechanism 40 withdraws from the support seat 20. There is no mold pressure applied by the upper and lower molds to the first sliding part 111, the second sliding part 121 and other components, and there is no thrust of the pushing mechanism 40 on the support seat 20. The elastic member 13 between the first connecting part 113 and the second connecting part 123 is elastically reset, and the first sliding part 111 moves backward slightly tilted relative to the second sliding part 121, so that the first support part 112 moves backward slightly tilted ( Figure 2 The second support portion 122 moves toward the center axis of the hole (in the direction indicated by the arrow B) and is separated from the inner hole 511 and elastically reset to the upper surface of the second sliding portion 121. The second support portion 122 moves toward the center axis of the hole (in the direction indicated by the arrow B) without the pressure of the first support portion 112. Figure 2 The outer surface of the housing 510 is moved in the direction indicated by arrow A) to disengage from the inner wall of the inner hole 511.

[0086] S4: The second sliding block 12 is separated from the inner hole 511 .

[0087] When the elastic member 13 returns to the state of natural extension and the first support portion 112 completely withdraws from the inner hole 511, since there is no thrust of the pushing mechanism 40 on the support seat 20, the elastic restoring force of the elastic object 22 between the support seat 20 and the workpiece mounting seat causes the support seat 20 to move backward, and the receiving groove 21 moves backward at the same time, while the protrusion 125 moves forward relative to the receiving groove 21, and the rear side wall of the receiving groove 21 abuts against the rear end surface of the protrusion 125. At this time, the continuous elastic restoring force of the elastic object 22 drives the support seat 20 to move forward along the guide member 30, and also enables the second slider 12 to move backward together with the support seat 20, thereby causing the second support portion 122 of the second slider 12 to detach from the inner hole 511. Since the first slider 11 is fixed to the support seat 20 by screws, the first slider 11 moves backward in conjunction with the support seat 20, so that the first support portion 112 continues to move away from the inner hole 511, thereby completing the separation process of the heat-resistant component support assembly 10 and the inner hole 511. The entire process avoids friction between the heat-resistant component support assembly 10 and the inner wall of the inner hole 511 , and effectively reduces friction damage to the side wall of the inner hole 511 .

[0088] In general, such as Figure 2As shown, when the hardness of the heat-resistant component 51 is less than 340HV, and the width and length of the recess 512 are greater than the distance d between the inner wall of the recess 512 and the inner wall of the inner hole 511, if the inner hole 511 is supported by a support column in the prior art for injection molding, the pressure of the molten plastic causes the inner hole 511 to be severely deformed. However, through the injection molding method of any of the above embodiments, even if the distance d between the inner wall of the recess 512 and the inner wall of the inner hole is less than 0.17mm, the size error of the inner hole 511 of the present invention can be less than 0.08mm or the shape error can be less than 0.04mm; the wall surface of the inner hole 511 can maintain the original roughness, with small error and high precision, thereby improving the quality of the product.

[0089] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention is described in detail with reference to the above preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. An injection molding method for injection molding a heat-resistant component having an inner hole, wherein the heat-resistant component is supported by a support assembly, wherein the support assembly includes a first slider and a second slider, and the injection molding method includes: The first slider is driven to move toward the inner hole so that the first slider and the second slider are inserted into the inner hole, wherein the depth of the second slider inserted into the inner hole is not less than the depth of the first slider inserted into the inner hole; the first slider includes a first supporting portion, and the second slider includes a second supporting portion, and the second supporting portion and the first supporting portion are sequentially inserted into the same inner hole and sequentially abut against a portion of the inner side wall of the inner hole; The heat-resistant component is injection molded so that a plastic component is formed around the inner hole.

2. The injection molding method according to claim 1, wherein: The step of driving the first slider to move toward the inner hole so that the first slider and the second slider are inserted into the inner hole comprises: Driving the first slider to move toward the inner hole and linking the second slider to insert into the inner hole; The first slider is further driven to slide on the second slider so that the second slider contacts a portion of the inner wall of the inner hole, and the first slider is inserted into the inner hole and contacts a portion of the inner wall of the inner hole.

3. The injection molding method according to claim 2, wherein: The first slider includes a first connection portion and a first sliding portion bently connected to the first connection portion, the second slider includes a second connection portion and a second sliding portion bently connected to the second connection portion, and the step of driving the first slider to move toward the inner hole and linking the second slider to insert into the inner hole includes: driving the first connecting portion to move the first sliding portion toward the inner hole; The first connecting part is further driven to link the second connecting part and the second sliding part, so that one end of the second sliding block is inserted into the inner hole.

4. The injection molding method according to claim 3, wherein: The first connecting portion is connected to the second connecting portion via an elastic member, and the step of further driving the first slider to slide on the second slider comprises: The first connecting part is further driven to elastically compress the elastic member, thereby linking the first sliding part to slide on the second sliding part.

5. The injection molding method according to claim 1, wherein: The first slider includes a first connection portion and a first sliding portion bently connected to the first connection portion, the second slider includes a second connection portion and a second sliding portion bently connected to the second connection portion, the first connection portion and the second connection portion are connected via an elastic member, and further, the injection molding method includes: Resiliently reset the elastic member between the first connecting portion and the second connecting portion to link the first sliding portion to slide on the second sliding portion, so that the first sliding block is separated from the inner hole and the second sliding block is separated from the inner side wall of the inner hole; The second sliding block is separated from the inner hole.

6. A housing, comprising: A heat-resistant component having an inner hole, wherein the surface roughness of the inner hole is less than Ra0.8; A plastic component is filled around the periphery of the inner hole by the injection molding method according to any one of claims 1 to 5.

7. The housing according to claim 6, wherein: The heat-resistant component also includes: bottom; A raised portion is provided on the bottom, and the inner hole is provided on the raised portion; The concave portion is formed at least one of the upper surface, the outer side surface, and the periphery of the convex portion, and the plastic component is filled in the concave portion.

8. The housing according to claim 7, wherein: The distance between the inner side wall of the recessed portion and the inner side wall of the inner hole is less than 0.32 mm, and the size error of the inner hole is less than 0.08 mm or the shape error is less than 0.04 mm.

9. The housing according to claim 6, wherein: The material of the heat-resistant component is metal with a hardness of 320-340 HV.

10. The housing according to claim 6, wherein: The plastic component includes a resin composition including a resin and glass fibers.

11. A terminal, comprising the housing according to any one of claims 6 to 10.

12. The terminal according to claim 11, wherein: The terminal further includes a sound conversion device, and the inner hole includes: a mounting hole, wherein the sound conversion device is mounted on the mounting hole; The sound hole is communicated with the mounting hole.

13. A support assembly for supporting a heat-resistant component to be injection molded, the heat-resistant component having an inner hole, the support assembly comprising a first slider and a second slider, The first slider comprises: a first sliding portion; A first supporting portion, disposed at one end of the first sliding portion; The second slider comprises: a second sliding portion, slidably connected to the first sliding portion, so that the first supporting portion slides out of one end of the second sliding portion to be inserted into the inner hole; or The first supporting portion is reset toward one end of the second sliding portion to be separated from the inner hole; A second supporting portion, provided at one end of the second sliding portion, for inserting into the inner hole; wherein the length of the second supporting portion is not less than the length of the first supporting portion; Wherein, the second supporting portion and the first supporting portion are sequentially inserted into the same inner hole and sequentially abut against a portion of the inner wall of the inner hole.

14. The support assembly of claim 13, wherein: The first slider further includes: A first connecting portion, connected to the first sliding portion by bending; The second slider further includes: The second connecting portion is bent and connected to the second sliding portion, and the second connecting portion is connected to the first connecting portion through an elastic member.

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