Mold assembly, shaft core part and injection molding part

Abstract

The utility model relates to the field of molds, and discloses a mold assembly, a shaft core part and a positioning part of the mold assembly are arranged in an injection molding cavity, and a first end surface of the shaft core part is propped against a second end surface of the positioning part. The upper part area of the first end face is sunken in the direction away from the second end face to form a first clamping part, the first clamping part cuts off the outer ring thread to form a first tangent plane between the outer ring thread and the first clamping part, and the bottom face of the first clamping part is connected with another circle of thread adjacent to the outer ring thread; a first protruding part is arranged on the second end face, the first protruding part is clamped in the first clamping part, and the first protruding part abuts against the first tangent plane between the first clamping part and the outer ring thread and the bottom face of the first clamping part. According to the mold assembly, thin glue is prevented from appearing at the end of the threaded hole of the injection molding part obtained through cooling, the situation that the injection molding part is strained in the demolding process due to the thin glue is avoided, and large deformation generated in the glue shrinkage process due to the fact that the thickness of the glue in the threaded hole is not uniform due to the thin glue is avoided.

Description

[Technical field]

[0001] The utility model relates to the field of molds, in particular to a mold component, a shaft core piece and an injection molded part. [Background technology]

[0002] Plastic injection mold is a tool used to produce injection molded products. It is usually composed of several parts, including mold shell, mold core, movable template, etc. When the injection mold is used, the molten plastic material is injected into the mold cavity, and after cooling and solidification, the desired plastic product can be obtained.

[0003] However, the injection molded products with threaded holes produced by existing molds will produce thin glue at the end of the threaded hole, which will make the injection molded products easily scratched during demoulding, and the thin glue will cause uneven glue thickness of the threaded hole, resulting in large deformation during the shrinkage of the glue. At the same time, there will be thin steel at the parting position of the mold parts corresponding to the threaded holes, which makes the mold parts easy to break. [Utility Model Content]

[0004] In order to solve the problem that injection molded products with threaded holes produced by existing molds will produce thin glue at the ends of the threaded holes, and that mold parts corresponding to the threaded holes have thin steel, the utility model provides a mold assembly, which includes a first mold core piece, a second mold core piece, an axial core piece and a positioning piece. After the first mold core piece and the second mold core piece are connected, an injection cavity is formed inside, the axial core piece and the positioning piece are arranged in the injection cavity, and the first end face of the axial core piece abuts the second end face of the positioning piece; a thread is arranged on the outer surface of the axial core piece, and the thread extends to the first end face of the axial core piece to form an outer circle thread; a part of the area on the first end face is recessed in a direction away from the second end face to form a first clamping portion, the first clamping portion cuts off the outer circle thread and forms a first section between the outer circle thread, and the bottom surface of the first clamping portion is connected to another circle thread adjacent to the outer circle thread; a first protrusion is arranged on the second end face, the first protrusion is clamped in the first clamping portion, and the first protrusion abuts against the first section between the first clamping portion and the outer circle thread and the bottom surface of the first clamping portion respectively.

[0005] Preferably, a partial area on the first end surface is recessed in a direction away from the second end surface to form a second clamping portion, and a second protruding portion is further provided on the second end surface, and the second protruding portion is clamped with the second clamping portion.

[0006] Preferably, a partial area on the second clamping portion is recessed in a direction away from the second end surface to form a third clamping portion, and a third protrusion is further provided on the second end surface, and the third protrusion is clamped with the third clamping portion.

[0007] Preferably, the distance between the bottom surface of the first clamping portion and the first end surface is greater than the distance between the third clamping portion and the first end surface.

[0008] Preferably, the bottom surface of the second clamping portion gradually tilts from one end close to the first section surface toward a direction away from the first end surface, a second section surface is formed between the second clamping portion and another circle of threads adjacent to the outer circle of threads, and the second protrusion abuts against the second section surface.

[0009] Preferably, a positioning column is provided on the first end surface, and a groove is provided on the second end surface, and the positioning column is buckled in the groove.

[0010] Preferably, the first end surface and the second end surface have the same shape and size.

[0011] Preferably, the outer ring thread comprises a thick section and a thin section, the thickness of the outer ring thread gradually decreases from the thick section to the thin section, and the first clamping portion is arranged close to the thin section.

[0012] In order to solve the above problems, the utility model also provides a shaft core member, the outer surface of the shaft core member is provided with threads, and the threads extend to the end surface of the shaft core member to form an outer circle thread;

[0013] A partial area on the end surface is recessed to form a clamping portion, the clamping portion cuts off the outer circle thread, and the bottom surface of the clamping portion is connected to another circle thread adjacent to the outer circle thread.

[0014] In order to solve the above problems, the utility model also provides an injection molded part, which is obtained by injection molding using the above mold assembly.

[0015] Compared with the prior art, the mold assembly, shaft core and injection molded part provided by the utility model have the following advantages:

[0016] 1. The mold assembly provided by the utility model includes a first mold core, a second mold core, an axis core and a positioning member. After the first mold core and the second mold core are connected, an injection cavity is formed inside. The axis core and the positioning member are arranged in the injection cavity, and the first end face of the axis core abuts against the second end face of the positioning member. A thread is arranged on the outer surface of the axis core, and the thread extends to the first end face of the axis core to form an outer circle thread. A part of the upper area of ​​the first end face is recessed in the direction away from the second end face to form a first clamping part, and the first clamping part cuts off the outer circle thread and forms a first section between the outer circle thread, and the bottom surface of the first clamping part is connected to another circle thread adjacent to the outer circle thread; a first protrusion is arranged on the second end face, and the first protrusion is clamped in the first clamping part, and the first protrusion abuts against the first section between the first clamping part and the outer circle thread and the bottom surface of the first clamping part respectively.

[0017] The utility model adopts the clamping cooperation between the first clamping part and the first protrusion part so that the first protrusion part can cut off the threaded depression part on the shaft core part close to the outer circle thread. When the hot melt adhesive is introduced into the injection cavity to obtain the injection molded part, the hot melt adhesive fills the cavity of the injection cavity. At the same time, the hot melt adhesive fills the threaded depression part of the thread on the surface of the shaft core part so that corresponding threads and threaded holes are generated on the inner surface of the injection molded part. When the hot melt adhesive flows along the threaded depression part, it will be blocked by the first protrusion part, which can prevent the hot melt adhesive from continuing to flow toward the threaded end of the shaft core part, thereby preventing the occurrence of thin adhesive at the end of the threaded hole of the injection molded part obtained by cooling, and preventing the injection molded part from being damaged by the thin adhesive during the demolding process, as well as the uneven adhesive thickness of the threaded hole caused by the thin adhesive, which will lead to large deformation during the shrinkage of the adhesive.

[0018] 2. In the utility model, a part of the upper area of ​​the first end surface is recessed in a direction away from the second end surface to form a second clamping portion, and a second protrusion is also provided on the second end surface, and the second protrusion is clamped with the second clamping portion. A part of the upper area of ​​the second clamping portion is recessed in a direction away from the second end surface to form a third clamping portion, and a third protrusion is also provided on the second end surface, and the third protrusion is clamped with the third clamping portion. The clamping cooperation between the second protrusion and the first clamping portion, and between the third protrusion and the third clamping portion can prevent the shaft core member and the positioning member from rotating relative to each other, thereby improving the sealing effect of the first protrusion on the thread on the shaft core member.

[0019] 3. The bottom surface of the second clamping part of the utility model gradually tilts from one end close to the first cut surface toward a direction away from the first end surface, and a second cut surface is formed between the second clamping part and another circle of threads adjacent to the outer circle of threads, and the second protrusion abuts against the second cut surface. By the first protrusion abutting against the first cut surface and the second cut surface respectively, the positioning member and the shaft core member can be restricted from rotating in multiple directions in clockwise and counterclockwise directions.

[0020] 4. The first end surface of the utility model is provided with a positioning column, and the second end surface is provided with a groove, and the positioning column is buckled in the groove. When the positioning member and the shaft core member are in contact, the positioning column and the groove can achieve rapid positioning, which can avoid assembly errors.

[0021] 5. The first end face and the second end face of the utility model have the same shape and size, so that the threaded hole on the obtained injection molded part has a beautiful shape and can improve the assembly accuracy between the shaft core part and the positioning part.

[0022] 6. The outer ring thread of the shaft core component of the utility model includes a thick section and a thin section. The thickness of the outer ring thread gradually decreases from the thick section to the thin section. The first clamping portion is arranged close to the thin section. By setting the first clamping portion to reduce the thin section of the thread, it is possible to avoid the appearance of thin steel at the end face of the shaft core component and avoid the appearance of fracture at the end face of the shaft core component caused by thin steel.

[0023] 7. The utility model also provides a shaft core member, which has the same beneficial effects as the shaft core member in the above-mentioned mold assembly.

[0024] 8. The utility model also provides an injection molded part, which is obtained by injection molding using the above-mentioned mold assembly. There is no thin glue at the end of the threaded hole of the injection molded part, which avoids the injection molded part being torn during the demolding process due to the thin glue, and avoids the uneven glue thickness of the threaded hole caused by the thin glue, which in turn causes a large deformation during the shrinkage of the colloid.

Brief Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 It is a front view of the mold assembly provided by the first embodiment of the utility model.

[0027] Figure 2 It is a top view of the mold assembly provided in the first embodiment of the utility model.

[0028] Figure 3 This is a diagram showing the matching state of the shaft core member and the positioning member provided in the first embodiment of the utility model.

[0029] Figure 4 It is an exploded view of the shaft core member and the positioning member provided in the first embodiment of the utility model.

[0030] Figure 5 It is a front view of the shaft core member provided in the first embodiment of the utility model.

[0031] Figure 6 It is a bottom view of the shaft core member provided in the first embodiment of the utility model.

[0032] Figure 7 It is an axial view of an injection molded part provided in the second embodiment of the utility model.

[0033] Description of the accompanying drawings:

[0034] 1. Mold assembly; 2. Injection molded parts;

[0035] 11. Upper sealing plate; 12. Runner separation plate; 13. Female mold; 14. Male mold; 15. Support plate; 16. Mold foot; 17. Upper ejector plate; 18. Lower ejector plate; 19. Lower sealing plate; 21. Threaded hole;

[0036] 111, flange locating ring; 112, nozzle; 131, auxiliary module; 132, motor; 133, shaft core; 134, positioning member; 135, first mold core; 141, faucet; 142, second mold core; 143, injection molding cavity; 171, reset column; 172, ejector pin; 191, reset switch; 211, internal thread;

[0037] 1331, positioning column; 1332, first clamping part; 1333, outer circle thread; 1334, first section; 1335, second section; 1336, second clamping part; 1337, first end face; 1341, groove; 1342, first protrusion; 1343, second protrusion; 1344, second end face. [Specific implementation method]

[0038] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and implementation examples. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0039] It should be noted that the terms "first" and "second" etc. in the specification and claims of the present utility model are used to distinguish different objects rather than to describe a specific order.

[0040] 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 be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0041] In the present invention, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0042] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this utility model can be understood according to specific circumstances.

[0043] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0044] Injection molded products with threaded holes produced by existing molds will produce thin glue at the end of the threaded hole, which will make the injection molded products easily scratched during demoulding, and the thin glue will cause uneven glue thickness at the threaded hole, resulting in large deformation during the colloid shrinkage process. At the same time, there will be thin steel at the parting position of the mold parts corresponding to the threaded holes, which makes the mold parts easy to break.

[0045] Please refer to Figure 1 and Figure 2 In order to solve the above technical problems, the first embodiment of the utility model provides a mold assembly 1, which includes a male mold 14 and a female mold 13. The male mold 14 and the female mold 13 are arranged closely and overlapped. The first mold core piece 135 and the second mold core piece 142 are respectively arranged on the opposite sides of the female mold 13 and the male mold 14. The first mold core piece 135 and the second mold core piece 142 are closed to form an injection cavity 143.

[0046] The side of the female mold 13 away from the male mold 14 is also closely adjacent to the runner separation plate 12 and the upper sealing plate 11. A through hole is arranged on the end surface of the upper sealing plate 11 away from the female mold 13. A hollow sleeve 112 is arranged in the through hole. One end of the sleeve 112 is connected to the outside world, and the other end of the sleeve 112 is connected to the runner in the runner separation plate 12. The runner in the runner separation plate 12 is connected to the runner in the female mold 13. The runner in the female mold 13 is connected to the injection cavity 143. A flange positioning ring 111 is also arranged in the through hole. The flange positioning ring 111 is clamped in the through hole of the sleeve 112 and abuts against the end of the sleeve 112 away from the female mold 13.

[0047] A support plate 15 and a lower sealing plate 19 are sequentially arranged on the side of the male mold 14 away from the female mold 13, a guide column is arranged between the upper sealing plate 11 and the lower sealing plate 19, and the guide column sequentially passes through the runner separation plate 12, the female mold 13, the male mold 14, and the support plate 15, and sleeves are respectively arranged at the connection between the above components and the guide column so that the above components can slide along the guide column.

[0048] A mold foot 16 perpendicular to the support plate 15 and the lower sealing plate 19 is also arranged between the support plate 15 and the lower sealing plate 19. A cavity is formed between the mold foot 16, the support plate 15 and the lower sealing plate 19. A detachably connected upper ejector plate 17 and a lower ejector plate 18 are arranged in the cavity. An ejector 172 is arranged on the upper ejector plate 17, and the ejector passes through the male mold 14 and extends to the injection cavity 143.

[0049] The mold assembly 1 further comprises a transmission module, which can respectively drive the runner separation plate 12, the female mold 13 and the male mold 14 to move axially along the guide column.

[0050] When casting the mold, firstly, the gun nozzle of the glue injection machine is sleeved on the flange positioning ring 111 on the upper sealing plate 11, so that the gun nozzle and the sleeve nozzle 112 are aligned and connected. The glue injection machine passes the hot melt glue into the sleeve nozzle 112 through the gun nozzle, and the hot melt glue flows through the runner separation plate 12 and the runner in the mother mold 13 in the sleeve nozzle 112 in sequence, and finally the hot melt glue enters the injection cavity 143. After the hot melt glue is cooled, an injection molded part 2 with the same shape and size as the injection cavity 143 is formed.

[0051] Then, the transmission module drives the runner separation plate 12 to move away from the upper sealing plate 11, and the parts between the runner separation plate 12 and the lower sealing plate 19 move away from the upper sealing plate 11 as a whole, so that the nozzle 112 is separated from the runner of the runner separation plate 12. Next, the transmission module drives the female mold 13 to move away from the runner separation plate 12, so that the runners in the runner separation plate 12 and the female mold 13 and the injection molded part 2 in the injection cavity 143 are separated. Finally, the transmission module drives the male mold 14 to move away from the female mold 13 so that the male mold 14 and the female mold 13 are demolded. At this time, the upper ejector plate 17 and the lower ejector plate 18 move toward the male mold 14, and the ejector 172 on the upper ejector plate 17 ejects the injection molded part 2 on the male mold 14 to obtain a detached injection molded part 2.

[0052] For further information, see Figure 1 A reset column 171 is also provided on the upper ejector plate 17, and the reset column 171 avoids the injection cavity 143 and penetrates the male mold 14. When the transmission module drives the male mold 14 to reset and move close to the female mold 13 after demolding the injection molded part 2, the reset column 171 on the upper ejector plate 17 abuts against the female mold 13, so that the upper ejector plate 17 and the ejector 172 return to the initial position, avoiding the ejector 172 from hitting the female mold 13 and causing damage.

[0053] For further information, see Figure 1 A reset switch 191 is also provided on the lower sealing plate 19. When the lower ejector plate 18 returns to the initial position, it contacts the reset switch 191 to give a safety signal. The reset switch 191 can ensure that the ejector 172 returns to a safe position to prevent the ejector 172 from being damaged by the mother mold 13.

[0054] For further information, please refer to Figure 1 , Figure 3 and Figure 4 , a shaft core 133 is arranged in the runner separation plate 12, and the shaft core 133 penetrates the female mold 13 and the first mold core 135 in the female mold 13 to enter the injection cavity 143. A positioning member 134 is arranged in the male mold 14 toward the female mold 13, and the positioning member 134 penetrates the male mold 14 and the second mold core 142 to enter the injection cavity 143. The first end face 1337 of the shaft core 133 entering the injection cavity 143 abuts against the second end face 1344 of the positioning member 134 entering the injection cavity 143. A thread is arranged on the outer surface of the shaft core 133, and the thread extends to the first end face 1337 of the shaft core 133 to form an outer circle thread 1333.

[0055] A partial area on the first end face 1337 is recessed in a direction away from the second end face 1344 to form a first clamping portion 1332, which cuts off the outer circle thread 1333, and the bottom surface of the first clamping portion 1332 is connected to another circle thread adjacent to the outer circle thread 1333; a first protrusion 1342 is provided on the second end face 1344, and the first protrusion 1342 is clamped in the first clamping portion 1332, and the first protrusion 1342 respectively abuts against the first cut surface 1334 between the first clamping portion 1332 and the outer circle thread 1333 and the bottom surface of the first clamping portion 1332.

[0056] The utility model adopts the clamping cooperation between the first clamping portion 1332 and the first protrusion 1342 so that the first protrusion 1342 can cut off the threaded recessed portion on the shaft core member 133 near the outer circle thread 1333. When the hot-melt adhesive is introduced into the injection molding cavity 143 to obtain the injection molded part 2, the hot-melt adhesive fills the cavity of the injection molding cavity 143. At the same time, the hot-melt adhesive fills the threaded recessed portion of the thread on the surface of the shaft core member 133, so that corresponding threads and threaded holes 21 are generated on the inner surface of the injection molded part 2. When the hot-melt adhesive flows along the threaded recessed portion, it will be blocked by the first protrusion 1342, which can prevent the hot-melt adhesive from continuing to flow toward the threaded end of the shaft core member 133, thereby preventing the occurrence of thin adhesive at the end of the threaded hole 21 of the injection molded part 2 obtained by cooling, and preventing the thin adhesive from causing the injection molded part 2 to be damaged during the demolding process, and preventing the threaded hole 21 from being unevenly thickened due to the thin adhesive, thereby causing large deformation during the shrinkage of the adhesive.

[0057] For further information, please refer to Figure 5 and Figure 6 A portion of the first end surface 1337 is recessed in a direction away from the second end surface 1344 to form a second clamping portion 1336 . A second protrusion is also provided on the second end surface 1344 , and the second protrusion is clamped with the second clamping portion 1336 .

[0058] Furthermore, the bottom surface of the second clamping portion 1336 gradually tilts from one end close to the first cut surface 1334 toward a direction away from the first end surface 1337 , and a second cut surface 1335 is formed between the second clamping portion 1336 and another circle of threads adjacent to the outer circle thread 1333 , and the second protrusion abuts against the second cut surface 1335 .

[0059] The first protrusion 1342 and the second protrusion respectively abut against the first cut surface 1334 and the second cut surface 1335 , thereby limiting the clockwise and counterclockwise multi-directional rotation between the positioning member 134 and the shaft core member 133 .

[0060] Optionally, a partial area on the second clamping portion 1336 is recessed in a direction away from the second end surface 1344 to form a third clamping portion, and a third protrusion is further provided on the second end surface 1344, and the third protrusion is clamped with the third clamping portion.

[0061] The clamping cooperation between the second protrusion and the first clamping part 1332 and the third protrusion and the third clamping part can prevent the shaft core 133 and the positioning part 134 from rotating relative to each other, thereby improving the sealing effect of the first protrusion 1342 on the thread on the shaft core 133.

[0062] The distance between the bottom surface of the first clamping portion 1332 and the first end surface 1337 is greater than the distance between the third clamping portion and the first end surface 1337. The third clamping portion is disposed adjacent to the first clamping portion 1332.

[0063] By setting the height difference between the third clamping portion and the first clamping portion 1332 , it is possible to limit the clockwise and counterclockwise multi-directional rotation of the first protruding portion 1342 clamped in the first clamping portion 1332 .

[0064] For further information, see Figure 4 A positioning column 1331 is provided on the first end surface 1337, and a groove 1341 is provided on the second end surface 1344, and the positioning column 1331 is buckled into the groove 1341. When the positioning member 134 and the shaft core member 133 are in contact, the positioning column 1331 and the groove 1341 can achieve rapid positioning, and assembly errors can be avoided.

[0065] For further information, see Figure 3 The first end face 1337 and the second end face 1344 have the same shape and size, so that the threaded hole 21 on the obtained injection molded part 2 has a beautiful shape and can improve the assembly accuracy between the shaft core member 133 and the positioning member 134.

[0066] For further information, see Figure 5The outer ring thread 1333 of the shaft core member 133 includes a thick section and a thin section. The thickness of the outer ring thread 1333 gradually decreases from the thick section to the thin section. The first clamping portion 1332 is arranged close to the thin section. By setting the first clamping portion 1332 to reduce the thin section of the thread, thin steel can be avoided at the end face of the shaft core member 133, and fracture at the end face of the shaft core member 133 caused by thin steel can be avoided.

[0067] For further information, please refer to Figure 1 and Figure 2 The annular circumference of the mold assembly 1 is divided into four surfaces, namely the operator surface, the non-operator surface, the top surface and the ground surface. The operator surface and the non-operator surface are opposite to each other, and the top surface and the ground surface are opposite to each other. The transmission module includes a motor 132 and an auxiliary module 131. The motor 132 is arranged on the top surface or the ground surface. When demolding, the injection molded part 2 falls off from the side opposite to the motor 132, which can prevent the motor 132 from interfering with the injection molded part 2. The auxiliary module 131 is arranged on the operator surface and the non-operator surface of the female mold 13 and is connected to the shaft core member 133. When the female mold 13 and the male mold 14 are separated, the auxiliary module 131 controls the shaft core member 133 to move toward the runner separation plate 12, which can prevent the shaft core member 133 from interfering with the falling of the injection molded part 2.

[0068] For further information, see Figure 1 The mold assembly 1 further includes a cooling module, which is disposed in the female mold 13 and the male mold 14 and can cool the first mold core 135 and the second mold core 142, accelerate the cooling of the injection molded part 2, and improve the working efficiency of the mold assembly 1. The water nozzle 141 of the cooling module is disposed on the operator surface or the non-operator surface of the male mold 14, which can prevent the water nozzle 141 from interfering with the injection molded part 2 that falls off, and prevent the mold assembly 1 from being rusted due to water leakage from the water nozzle 141.

[0069] When the injection molding operation is performed, the hot melt adhesive flowing into the injection molding cavity 143 fills the cavity of the injection molding cavity 143. At the same time, the hot melt adhesive will fill the threaded recessed portion of the thread on the surface of the shaft core piece 133, so that corresponding threads and threaded holes 21 are generated on the injection molding part 2. When the hot melt adhesive flows along the threaded recessed portion, it will be blocked by the first protrusion 1342, which can prevent the hot melt adhesive from continuing to flow toward the threaded end of the shaft core piece 133, thereby preventing the formation of thin adhesive at the end of the threaded hole 21 of the injection molding part 2 obtained by cooling. Finally, the injection molding part 2 with the threaded hole 21 is obtained after cooling, and there is no thin adhesive at the end of the threaded hole 21, which avoids the injection molding part 2 being stretched during the demolding process due to the thin adhesive, and the uneven adhesive thickness of the threaded hole 21 caused by the thin adhesive, thereby causing large deformation during the shrinkage of the adhesive.

[0070] See also Figure 7The second embodiment of the utility model also provides an injection molded part 2, which is obtained by injection molding the above-mentioned mold assembly 1. The shape and size of the injection molded part 2 are the same as the injection cavity 143. There is a threaded hole 21 on the injection molded part 2, and an internal thread 211 is provided on the inner surface of the threaded hole 21. The internal thread 211 and the thread extending from the shaft core 133 into the injection cavity 143 are matched. The internal thread 211 is entirely located on the inner surface of the threaded hole 21, and there is a gap between the end of the internal thread 211 and the plane where the port of the threaded hole 21 is located. The injection molded part 2 has the same beneficial effects as mentioned above.

[0071] Compared with the prior art, the mold assembly, shaft core and injection molded part provided by the utility model have the following advantages:

[0072] 1. The mold assembly provided by the utility model includes a first mold core piece, a second mold core piece, an axial core piece and a positioning piece. After the first mold core piece and the second mold core piece are connected, an injection cavity is formed inside. The axial core piece and the positioning piece are arranged in the injection cavity, and the first end face of the axial core piece abuts against the second end face of the positioning piece. A thread is arranged on the outer surface of the axial core piece, and the thread extends to the first end face of the axial core piece to form an outer circle thread. A part of the upper area of ​​the first end face is recessed in the direction away from the second end face to form a first clamping part, the first clamping part cuts off the outer circle thread, and the bottom surface of the first clamping part is connected to another circle thread adjacent to the outer circle thread; a first protrusion is arranged on the second end face, the first protrusion is clamped in the first clamping part, and the first protrusion abuts against the first cut surface between the first clamping part and the outer circle thread and the bottom surface of the first clamping part respectively.

[0073] The utility model adopts the clamping cooperation between the first clamping part and the first protrusion part so that the first protrusion part can cut off the threaded depression part on the shaft core part close to the outer circle thread. When the hot melt adhesive is introduced into the injection cavity to obtain the injection molded part, the hot melt adhesive fills the cavity of the injection cavity. At the same time, the hot melt adhesive fills the threaded depression part of the thread on the surface of the shaft core part so that corresponding threads and threaded holes are generated on the inner surface of the injection molded part. When the hot melt adhesive flows along the threaded depression part, it will be blocked by the first protrusion part, which can prevent the hot melt adhesive from continuing to flow toward the threaded end of the shaft core part, thereby preventing the occurrence of thin adhesive at the end of the threaded hole of the injection molded part obtained by cooling, and preventing the injection molded part from being damaged by the thin adhesive during the demolding process, as well as the uneven adhesive thickness of the threaded hole caused by the thin adhesive, which will lead to large deformation during the shrinkage of the adhesive.

[0074] 2. In the utility model, a part of the upper area of ​​the first end surface is recessed in a direction away from the second end surface to form a second clamping portion, and a second protrusion is also provided on the second end surface, and the second protrusion is clamped with the second clamping portion. A part of the upper area of ​​the second clamping portion is recessed in a direction away from the second end surface to form a third clamping portion, and a third protrusion is also provided on the second end surface, and the third protrusion is clamped with the third clamping portion. The clamping cooperation between the second protrusion and the first clamping portion, and between the third protrusion and the third clamping portion can prevent the shaft core member and the positioning member from rotating relative to each other, thereby improving the sealing effect of the first protrusion on the thread on the shaft core member.

[0075] 3. The bottom surface of the second clamping part of the utility model gradually tilts from one end close to the first cut surface toward a direction away from the first end surface, and a second cut surface is formed between the second clamping part and another circle of threads adjacent to the outer circle of threads, and the second protrusion abuts against the second cut surface. By the first protrusion abutting against the first cut surface and the second cut surface respectively, the positioning member and the shaft core member can be restricted from rotating in multiple directions in clockwise and counterclockwise directions.

[0076] 4. The first end surface of the utility model is provided with a positioning column, and the second end surface is provided with a groove, and the positioning column is buckled in the groove. When the positioning member and the shaft core member are in contact, the positioning column and the groove can achieve rapid positioning, which can avoid assembly errors.

[0077] 5. The first end face and the second end face of the utility model have the same shape and size, so that the threaded hole on the obtained injection molded part has a beautiful shape and can improve the assembly accuracy between the shaft core part and the positioning part.

[0078] 6. The outer ring thread of the shaft core component of the utility model includes a thick section and a thin section. The thickness of the outer ring thread gradually decreases from the thick section to the thin section. The first clamping portion is arranged close to the thin section. By setting the first clamping portion to reduce the thin section of the thread, it is possible to avoid the appearance of thin steel at the end face of the shaft core component and avoid the appearance of fracture at the end face of the shaft core component caused by thin steel.

[0079] 7. The utility model also provides a shaft core member, which has the same beneficial effects as the shaft core member in the above-mentioned mold assembly.

[0080] 8. The utility model also provides an injection molded part, which is obtained by injection molding using the above-mentioned mold assembly. There is no thin glue at the end of the threaded hole of the injection molded part, which avoids the injection molded part being torn during the demolding process due to the thin glue, and avoids the uneven glue thickness of the threaded hole caused by the thin glue, which in turn causes a large deformation during the shrinkage of the colloid.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A mold assembly, Features: The mold comprises a first mold core piece, a second mold core piece, an axis core piece and a positioning piece, wherein the first mold core piece and the second mold core piece are connected to form an injection cavity inside, the axis core piece and the positioning piece are arranged in the injection cavity, and the first end face of the axis core piece abuts against the second end face of the positioning piece; The outer surface of the shaft core is provided with a thread, and the thread extends to the first end surface of the shaft core to form an outer circle thread; A portion of the first end surface is recessed in a direction away from the second end surface to form a first clamping portion, the first clamping portion cuts through the outer thread to form a first section, and the bottom surface of the first clamping portion is connected to another circle of thread adjacent to the outer thread; A first protrusion is disposed on the second end surface. The first protrusion is clamped in the first clamping portion, and the first protrusion abuts against the first section between the first clamping portion and the outer ring thread and the bottom surface of the first clamping portion respectively.

2. A mold assembly according to claim 1, Features: A partial area on the first end surface is recessed in a direction away from the second end surface to form a second clamping portion. A second protrusion is also arranged on the second end surface, and the second protrusion is clamped with the second clamping portion.

3. A mold assembly according to claim 2, Features: An upper area of ​​the second clamping portion is recessed in a direction away from the second end surface to form a third clamping portion. A third protrusion is also provided on the second end surface, and the third protrusion is clamped with the third clamping portion.

4. A mold assembly according to claim 3, Features: The distance between the bottom surface of the first clamping portion and the first end surface is greater than the distance between the third clamping portion and the first end surface.

5. A mold assembly according to claim 2, Features: The bottom surface of the second clamping portion gradually inclines from an end close to the first section surface toward a direction away from the first end surface, and a second section surface is formed between the second clamping portion and another circle of threads adjacent to the outer circle of threads, and the second protrusion abuts against the second section surface.

6. A mold assembly according to claim 1, Features: A positioning column is arranged on the first end surface, and a groove is arranged on the second end surface, wherein the positioning column is buckled in the groove.

7. A mold assembly according to claim 1, Features: The first end surface and the second end surface have the same shape and size.

8. A mold assembly according to claim 1, Features: The outer ring thread comprises a thick section and a thin section, the thickness of the outer ring thread gradually decreases from the thick section to the thin section, and the first clamping portion is arranged close to the thin section.

9. A shaft core member, Features: The outer surface of the shaft core is provided with threads, and the threads extend to the end surface of the shaft core to form outer circle threads; A partial area on the end surface is recessed to form a clamping portion, the clamping portion cuts off the outer circle thread, and the bottom surface of the clamping portion is connected to another circle thread adjacent to the outer circle thread.

10. An injection molded part, Features: The product is obtained by injection molding using the mold assembly as described in any one of claims 1 to 9.

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