Injection mold for molding highlight mirror surface product

Abstract

The utility model discloses an injection mold for molding a highlight mirror surface product, relates to the technical field of injection molds, and solves the problems of strain and crease of an injection molded part in the demolding process, the injection mold comprises a front mold core and a rear mold core, the front mold core is provided with an insert, the rear mold core is provided with a deep cavity, and the insert is inserted into the deep cavity. The insert is used for being inserted into the deep cavity, a gap is reserved between the insert and the inner wall of the deep cavity to form an injection molding cavity, the insert is provided with a plurality of reverse buckling parts at intervals in the circumferential direction, and each reverse buckling part and a formed injection molding part form a buckling relation, so that the reverse buckling parts can drive the formed injection molding part to be separated from the inner wall of the deep cavity. The injection molding part can be uniformly stressed in the process of being pulled out of the deep cavity, the outer highlight mirror surface of the injection molding part is not creased or pulled, and the product yield is improved.

Description

Technical Field

[0001] The utility model relates to an injection mold, in particular to the technical field of an injection mold for molding high-gloss mirror products. Background Art

[0002] As the technology of true wireless Bluetooth headset solutions matures, the market entry threshold is lowered, and a large number of manufacturers are rapidly pouring in. Major companies continue to promote the innovation and development of Bluetooth headsets. In the future, the technology will continue to mature and the cost will gradually decrease. At the same time, in order to improve the competitiveness of the products, higher requirements are also put forward for the appearance of the headset box.

[0003] At present, the upper cover of the Bluetooth headset box is basically an injection-molded deep cavity structure, and the outer surface is a high-gloss mirror to improve the appearance. After the upper cover of the headset box is molded, the material is relatively soft, the wall thickness is relatively thin, and the structural strength is weak. A rotating shaft seat is molded on the inner wall of one side of the deep cavity of the upper cover of the headset box to cooperate with the connection with the lower cover of the headset box to realize the opening and closing of the upper cover and the lower cover of the headset box. Since the rotating shaft seat protrudes toward the deep cavity, a rotating shaft inclined top for molding the rotating shaft seat is provided in the front mold of the corresponding mold. When the front and rear molds are opened, the upper cover of the headset box is pulled out from the rear mold to the front mold by using the buckling relationship between the rotating shaft inclined top and the rotating shaft seat. However, since the outer surface of the earphone box is a high-gloss mirror structure, that is, the inner wall of the cavity of the rear mold is smooth, there is a vacuum suction between the outer surface of the earphone box and the cavity of the rear mold after injection molding. In addition, since the material of the upper cover of the earphone box is relatively soft after molding and the structural strength is weak, when the earphone box is pulled out by using the inclined top of the shaft, the force points of the entire shell of the upper cover of the earphone box are concentrated on the position of the shaft seat. The outer surface of the upper cover of the earphone box is prone to creases at the shaft seat, which destroys the high-gloss mirror surface of the outer surface of the upper cover of the earphone box. In addition, the product is easily stretched and deformed, resulting in the size not meeting the requirements, poor product quality, low yield, and poor economic benefits. Utility Model Content

[0004] Therefore, in order to solve the above-mentioned problems, the utility model provides an injection mold for molding high-gloss mirror products.

[0005] To achieve the above purpose, the technical solution provided by the utility model is as follows:

[0006] An injection mold for molding high-gloss mirror products, comprising a front mold core and a rear mold core, the front mold core is provided with an insert, the rear mold core is provided with a deep cavity, the insert is used to be inserted into the deep cavity and leave a gap between the insert and the inner wall of the deep cavity to form an injection cavity, the insert is provided with a plurality of undercuts at intervals along the circumferential direction, each of the undercuts forms a buckling relationship with the molded injection molded part, so that the undercuts can drive the molded injection molded part to separate from the inner wall of the deep cavity.

[0007] Optionally, the insert includes a main insert and a plurality of auxiliary inserts, wherein the plurality of auxiliary inserts are embedded in the main insert at circumferential intervals, and the auxiliary inserts can move relative to the main insert and protrude from the main insert so that the molded injection molded part can be separated from the main insert, and the undercut portion is arranged on the auxiliary insert.

[0008] Optionally, the undercut portion is in a transverse bar structure, and the transverse direction of the transverse bar structure is perpendicular to the direction of mold closing or mold opening movement.

[0009] Optionally, the undercut portion has a force-applying surface for applying a force to the injection molded part away from the rear mold core when the mold is opened, and the force-applying surface is a side wall surface of the undercut portion away from the rear mold core; the force-applying surface is inclined, with its inclined upper end close to the outer wall of the auxiliary insert and its inclined lower end away from the outer wall of the auxiliary insert, and the angle between the force-applying surface and the horizontal plane is between 8-12°.

[0010] Optionally, on the cross section of the undercut portion, a vertical projection length of a distance from an inclined lower end point to an inclined upper end point of the force-applying surface is between 0.2-0.3 mm.

[0011] Optionally, the injection mold further includes a front template, a rear template, a return spring, a pull rod, an ejector and an ejector plate, the front mold core is arranged in the front template, the rear mold core is arranged in the rear template, and the ejector plate is movably arranged in the front template along the mold closing or mold opening direction; one end of the pull rod is connected to the ejector plate, and the other end extends into the rear template, and a limiting portion is provided at the end of the pull rod extending into the rear template, and a blocking portion that limits the pull rod from detaching from the rear template is provided in the through hole of the rear template through which the pull rod is movably passed, so that the rear template drives the pull rod to move through the blocking portion during the mold opening process. The ejector plate is moved toward the rear template by the movement of the front template; the return spring is arranged in the front template to apply elastic force to the ejector plate away from the rear template, so that the ejector plate returns to its original position without being affected by the pulling force of the pull rod; one end of the ejector is connected to the ejector plate, and the other end is movably embedded in the main insert, so that one end surface of the ejector and the main insert are used together to form the inner wall surface of the injection molded part; each of the auxiliary inserts is connected to an inclined ejector rod, and the inclined ejector rod is connected to the ejector plate; the ejector and the inclined ejector rod move with the ejector plate, so that the end of the ejector and the auxiliary insert are embedded or protruded from the main insert.

[0012] Optionally, a limiting mechanism is further provided on the front template to limit the movement of the ejector plate before the mold is opened.

[0013] Optionally, the limiting mechanism includes a blocking block and a driving member, and the driving member drives the blocking block to enable the blocking block to block the moving path of the ejector plate or to be separated from the moving path of the ejector plate.

[0014] Optionally, the injection mold further comprises a plug-in block assembly, wherein the plug-in block assembly comprises a plug-in block, and the plug-in block can be movably inserted into or removed from the injection cavity to form the outer wall surface of the rotating shaft seat of the injection molded part.

[0015] Optionally, the injection mold further comprises a plug-in shaft assembly, wherein the plug-in shaft assembly comprises a plug-in shaft, and the plug-in shaft can be movably inserted into or removed from the injection cavity to form an axial hole of a rotating shaft seat of the injection molded part.

[0016] The technical solution provided by the utility model has the following beneficial effects:

[0017] 1. The undercut parts are arranged at intervals along the circumference of the insert, so that when the undercut parts pull the injection molded part out of the deep cavity, the injection molded part is evenly stressed as a whole, and no creases are generated on the outer high-gloss mirror surface of the injection molded part or the injection molded part is stretched and deformed, thereby improving the product yield and improving economic benefits;

[0018] 2. The setting of the limit mechanism can ensure that the ejector plate will not be pulled by the vacuum suction between the injection molded part and the deep cavity at the moment of mold opening, so that the injection molded part can be demoulded normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an overall schematic diagram of this embodiment;

[0020] Figure 2 Schematic diagram of the explosion of the front mold core and the rear mold core in this embodiment;

[0021] Figure 3 Schematic diagram of the injection molded part in this embodiment;

[0022] Figure 4 Schematic diagram of the explosion of the main insert, the auxiliary insert, the inclined ejector rod and the ejector pin in this embodiment;

[0023] Figure 5 1 is an exploded schematic diagram of the main insert, the auxiliary insert, the inclined ejector rod and the ejector pin from another perspective in this embodiment;

[0024] Figure 6 1 is an exploded schematic diagram of the main insert, the auxiliary insert, the inclined ejector rod and the ejector pin from another perspective in this embodiment;

[0025] Figure 7 is a cross-sectional structural diagram of the auxiliary insert in this embodiment;

[0026] Figure 8 yes Figure 7 The enlarged schematic diagram of point A in the middle;

[0027] Fig. 9 is a structural schematic diagram highlighting the ejector plate, the return spring, and the connecting column in this embodiment;

[0028] Fig.10 is a cross-sectional view highlighting the ejector plate and the pull rod in this embodiment;

[0029] Fig.11 is a schematic diagram highlighting the ejector plate and the limiting mechanism in this embodiment;

[0030] Fig.12 yes Fig.11 The enlarged schematic diagram of point B in the middle;

[0031] Fig.13 is a schematic diagram of a plug-in block assembly in this embodiment;

[0032] Fig.14 is an exploded schematic diagram of the plug-in block assembly in this embodiment;

[0033] Fig.15 is an exploded schematic diagram of the plug-in block assembly from another perspective in this embodiment;

[0034] Fig.16 is a schematic diagram of the splice shaft assembly in this embodiment;

[0035] Fig.17 Schematic diagram of the exploded view of the splice shaft assembly in this embodiment.

[0036] Description of the accompanying drawings: 1, front template; 11, limit mechanism; 12, blocking block; 13, driving member; 14, abutting surface; 2, rear template; 21, blocking portion; 3, front mold core; 31, insert; 32, main insert; 33, auxiliary insert; 331, first auxiliary insert; 332, second auxiliary insert; 333, third auxiliary insert; 334, fourth auxiliary insert; 335, fifth auxiliary insert; 34, undercut portion; 35, force application surface; 36, ejector; 37, inclined ejector rod; 4, rear mold core; 41, deep cavity; 5, injection molded part; 51, undercut groove; 52, shaft seat; 6, ejector plate; 61, complex Position spring; 62, pull rod; 621, limit part; 63, connecting column; 64, inclined groove; 7, front mold fixing plate; 8, front mold base; 9, rear mold base; 100, plug-in block assembly; 101, plug-in block; 102, first sliding block; 103, first pushing block; 104, exit spring; 105, first inclined surface; 106, first pushing surface; 200, plug-in shaft assembly; 201, plug-in shaft; 202, second sliding block; 203, second pushing block; 204, third pushing block; 205, driving inclined rod; 206, plug-in hole; 207, second inclined surface; 208, positioning surface. DETAILED DESCRIPTION

[0037] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0038] The utility model is now further described in conjunction with the accompanying drawings and specific implementation methods.

[0039] Reference Figure 1-3 , an injection mold for molding high-gloss mirror products, used for injection molding earphone box cover products, collectively referred to as injection molded parts 5 in the following description. The injection mold includes a front mold plate 1, a rear mold plate 2, a front mold core 3 and a rear mold core 4. The front mold core 3 and the rear mold core 4 are installed in the front mold plate 1 and the rear mold plate 2 respectively. The front mold core 3 is installed with an insert 31, and the rear mold core 4 is provided with a deep cavity 41 corresponding to the insert 31. The inner wall of the deep cavity 41 is smooth to form a high-gloss mirror surface on the outer wall of the injection molded part 5. When the front mold plate 1 and the rear mold plate 2 are molded together, the insert 31 on the front mold core 3 is inserted into the deep cavity 41 of the rear mold core 4, and there is a gap between the insert 31 and the deep cavity 41 to form an injection cavity. In this embodiment, the front mold core 3 is provided with four inserts 31 spaced apart along the circumferential direction, and correspondingly, the rear mold core 4 is provided with four deep cavities 41, and the four inserts 31 and the four deep cavities 41 form four injection cavities corresponding to form four injection molded parts 5 at the same time. For ease of description, the description is given assuming that the front template 1 and the rear template 2 are in a state of being vertically clamped.

[0040] Specifically, the insert 31 includes a main insert 32 and a plurality of auxiliary inserts 33. The main insert 32 is detachably fixed and embedded in the front mold core 3. The plurality of auxiliary inserts 33 are embedded in the main insert 32 at intervals along the circumferential direction and can move relative to the main insert 32 and protrude from the main insert 32. When the auxiliary insert 33 is embedded in the main insert 32, the outer surfaces of the auxiliary insert 33 and the main insert 32 face the inner wall surface used for molding the injection molded part 5. A corresponding undercut portion 34 is provided on each auxiliary insert 33, and a buckling relationship is formed between each undercut portion 34 and the inner wall of the injection molded part 5, that is, the undercut portion 34 forms an undercut groove 51 on the inner wall of the injection molded part 5, so that the undercut portion 34 on each auxiliary insert 33 can pull the injection molded part 5 out of the deep cavity 41 of the rear mold core 4 during demoulding through the cooperation between the undercut portion 34 and the undercut groove 51, thereby overcoming the vacuum suction between the deep cavity 41 and the injection molded part 5.

[0041] Reference Figure 4-6, the several auxiliary inserts 33 installed on each main insert 32 are specifically the first auxiliary insert 331, the second auxiliary insert 332, the third auxiliary insert 333, the fourth auxiliary insert 334 and the fifth auxiliary insert 335. The injection molded part 5 is a slot structure with an open deep cavity 41, and the end face of the opening is an inclined surface, forming an oblique mouth, and the shaft seat 52 of the injection molded part 5 protrudes from the upper end face of the oblique mouth, and the shaft seat 52 faces the inside of the deep cavity 41. The first auxiliary insert 331 is embedded in the front side of the main insert 32, and the front side is the inner wall on one side where the shaft seat 52 is located; the second auxiliary insert 332 and the third auxiliary insert 333 are respectively embedded in the left and right side walls of the main insert 32; the fourth auxiliary insert 334 and the fifth auxiliary insert 335 are both located on the rear side wall of the main insert 32, that is, the side wall facing away from the first auxiliary insert 331, and the fourth auxiliary insert 333 and the fifth auxiliary insert 334 are arranged side by side and spaced apart. The undercut portions 34 on each auxiliary insert 33 are all in a strip-shaped structure and are arranged horizontally, which is roughly perpendicular to the opening direction of the rear template 2 and the front template 1. In this way, when the rear template 2 and the front template 1 are opened, the undercut portions 34 can have sufficient contact area with the injection molded part 5 in the force application direction, and the tension generated inside the injection molded part 5 is more uniform, thereby avoiding the tension being concentrated in a certain area on the inner wall of the injection molded part 5 and causing damage to the injection molded part 5.

[0042] In this embodiment, the first sub-block 331 is provided with an undercut portion 34, the second sub-block 332 and the third sub-block 333 are symmetrical structures, and both have two undercut portions 34 arranged at intervals along a direction perpendicular to the length of the undercut portion 34, the fourth sub-block 334 has five undercut portions 34 arranged at intervals along a direction perpendicular to the length of the undercut portion 34, and the fifth sub-block 335 has six undercut portions 34 arranged at intervals along a direction perpendicular to the length of the undercut portion 34. The length and number of the undercuts 34 on each auxiliary insert 33 are adjusted according to actual conditions, and the adjustment factors are the overall width and area of ​​each auxiliary insert 33 and other structures on each auxiliary insert 33 for molding on the inner wall of the injection molded part 5, that is, the wider the width of the auxiliary insert 33, the longer the length of the undercut 34, the larger the overall area of ​​the auxiliary insert 33, the more the number of undercuts 34 or the longer the length. At the same time, if there are other structures on the auxiliary insert 33, the undercuts 34 at the corresponding position need to give way to other structures, and the length and number of the undercuts 34 are correspondingly reduced, such as Figure 4 Through the undercuts 34 provided on each auxiliary insert 33, when the front mold is separated from the rear mold, the undercuts 34 can apply sufficient pulling force to the inner wall of the injection molded part 5, and the undercuts 34 can act more evenly on the circumferential inner wall of the injection molded part 5, so as to pull the injection molded part 5 out of the deep cavity 41 of the rear mold plate 2, thereby preventing the high-gloss outer mirror surface of the injection molded part 5 from being creased, stretched, deformed, etc. due to uneven force when the injection molded part 5 is pulled out.

[0043] Reference Figure 7 and Figure 8The undercut portion 34 has a force-applying surface 35, which is used to apply a force to the injection molded part 5 away from the rear mold core 4 when the mold is opened. The force-applying surface 35 is a side wall surface of the undercut portion 34 away from the rear mold core 4. The force-applying surface 35 is inclined, and its inclined upper end is close to the outer wall of the auxiliary insert 33, and the inclined lower end is away from the outer wall of the auxiliary insert 33. The angle a between the force-applying surface 35 and the horizontal plane is between 8-12°. In this embodiment, the angle a between the force-applying surface 35 and the horizontal plane is 10°. On the cross section of the undercut portion 34, the vertical projection length L of the distance from the inclined lower end point to the inclined upper end point of the force-applying surface 35 is between 0.2-0.3mm. In this embodiment, since the wall thickness of the injection molded part is relatively thin, only about 1.4mm, the projection length L is 0.24mm. The main influencing factor of its projection length L is the wall thickness of the injection molded part 5, that is, the thicker the wall thickness of the injection molded part 5, the longer the projection length L can be set, and the thinner the wall thickness of the injection molded part 5, the shallower the projection length L, so as to avoid damage such as stretching and deformation of the injection molded part 5 due to weak structural strength.

[0044] Reference Fig. 9 The injection mold also includes an ejector pin 36 and an ejector plate 6. The ejector pin 36 is movably inserted into the main insert 32, and one end of the ejector pin 36 is connected and transitioned with the outer wall surface of the main insert 32, that is, the end surface of the ejector pin 36 is also used to form the inner wall surface of the injection molded part 5, and the other end of the ejector pin 36 is fixedly connected to the ejector plate 6. Each auxiliary insert 33 is fixedly connected to an inclined ejector rod 37, one end of the inclined ejector rod 37 is connected to the auxiliary insert 33, and the other end is slidably connected to the ejector plate 6. Since the main insert 32 itself is small in size, and the inclined ejector rod 37 connected to the auxiliary insert 33 needs to ensure a certain strength, the inclined ejector rod 37 cannot be too thin; therefore, the inclined ejector rod 37 connected to each auxiliary insert 33 is inclined and enclosed to form an outward expansion structure from the main insert 32 toward the ejector plate 6, so as to facilitate the installation and connection of the end of the inclined ejector rod 37 with the ejector plate 6. In addition, a sliding connection is formed between the end of the inclined ejector rod 37 and the ejector plate 6, so that the diameter of the perforation holes provided on the front mold core 3 and the front mold plate 1 for the inclined ejector rod 37 to pass through does not need to be too large, so that the inclined ejector rod 37 can be moved relative to the main insert 32 during the demoulding process. The movement of the ejector plate 6 toward the main insert 32 can drive the ejector 36 and the auxiliary insert 33 at the end of the inclined ejector rod 37 to protrude from the main insert 32, thereby ejecting the injection molded part 5 from the main insert 32, completing the demoulding action of the injection molded part 5. When the ejector plate 6 moves to a specified position in a direction away from the main insert 32, each auxiliary insert 33 and the ejector 36 are reset and embedded in the main insert 32.

[0045] Specifically, refer to Fig. 9 and 10The injection mold further includes a reset spring 61, a pull rod 62, a front mold fixing plate 7, a front mold seat 8, and a rear mold seat 9. The front mold fixing plate 7 is fixedly connected to a side wall of the front mold 1 away from the rear mold 2, and the front mold seat 8 is fixedly connected to a side wall of the front mold fixing plate 7 away from the rear mold 2. Similarly, the rear mold seat 9 is fixedly connected to a side wall of the rear mold 2 away from the front mold 1. A connecting column 63 is provided in the front mold 1. Four connecting columns 63 are provided and arranged at intervals along the circumference of the front mold 1. The other end of the connecting column 63 is connected to the front mold fixing plate 7. The four corner positions of the ejector plate 6 are slidably sleeved on the corresponding connecting columns 63 one by one, so that the ejector plate 6 can slide axially along the connecting columns 63 in the front mold 1. Four reset springs 61 are provided corresponding to the connecting columns 63, and are sleeved on the connecting columns 63 one by one, and one end of the reset spring 61 abuts against the ejector plate 6, which can be used to drive the ejector plate 6 to move away from the rear mold 2. In the mold closing state, one end of the pull rod 62 is fixedly connected to the ejector plate 6, and the other end passes through the rear mold plate 2 and extends into the rear mold base 9. A limiting portion 621 is provided at one end of the pull rod 62 away from the ejector plate 6, and a blocking portion 21 is provided in the through hole on the rear mold plate 2 for the pull rod 62 to pass through, which is used to abut against the limiting portion 621 and limit the pull rod 62 from being separated from the rear mold plate 2. In this way, when the mold is opened, the rear mold base 9 and the rear mold plate 2 move away from the front mold at the same time. During the moving stroke S, the limit portion 621 at the end of the pull rod 62 abuts against the blocking portion 21. After that, the rear mold base 9 and the rear mold plate 2 continue to move away from the front mold plate 1, and the pull rod 62 moves accordingly, thereby pulling the ejector plate 6 toward the rear mold base 9, so that the inclined ejector rod 37 and the ejector pin 36 connected to the ejector plate 6 move toward the rear mold base 9, and the end of the ejector pin 36 and each auxiliary insert 33 jointly push the injection molded part 5 to separate from the main insert 32. The injection molded part 5 is evenly stressed when it is separated from the main insert 32, and the demolding action of the injection molded part 5 is achieved. Among them, there are four pull rods 62, corresponding to the four corners of the ejector plate 6, to ensure that the ejector plate 6 is evenly stressed when the ejector plate 6 is pulled. After demoulding is completed, the front template 1 and the rear template 2 are molded together, and the ejector plate 6 is reset under the action of the reset spring 61. The ejector plate 6 rests on the front mold fixing plate 7. The ejector plate 6 drives the ejector 36 to reset, and at the same time drives the inclined ejector rod 37 to complete the reset, so that the auxiliary inserts 33 at the ends of each inclined ejector rod 37 are accurately embedded in the main inserts 32, and can prepare for the next injection molding work.

[0046] At the moment of mold opening between the front template 1 and the rear template 2, the undercuts 34 on each auxiliary insert 33 apply a force to the injection molded part 5 toward the front template 1, and there is a vacuum suction force between the inner wall of the deep cavity 41 of the rear mold core 4 and the high-gloss outer wall of the injection molded part 5. Since the elastic force applied by the reset spring 61 to the ejector plate 6 cannot be too large, excessive elastic force can easily cause the ejector plate 6 to deform and damage the mold parts, affecting the mold precision and service life, and increasing the mold maintenance cost. When the pulling force applied by the undercuts 34 on each auxiliary insert 33 to the injection molded part 5 is greater than the vacuum suction force between the rear mold core 4 and the injection molded part 5, and the force applied by the reset spring 61 to the ejector plate 6 away from the rear template 2 is less than the vacuum suction force, then at the moment of mold opening, the ejector plate 6 will be pulled by the vacuum suction force between the rear mold core 4 and the injection molded part 5, and the ejector plate 6 will move toward the rear template 2, so that the normal demolding of the injection molded part 5 cannot be achieved. To this end, a limiting mechanism 11 is also provided on the front mold plate 1 to limit the movement of the ejector plate 6 before mold opening to ensure that the ejector plate 6 will not be pulled by the vacuum suction between the rear mold core 4 and the injection molded part 5.

[0047] Reference Fig.11 and Fig.12 The limiting mechanism 11 includes a blocking block 12 and a driving member 13, and the driving member 13 is a cylinder. The piston rod end of the cylinder is connected to the blocking block 12, which is used to drive the blocking block 12 to block or disengage from the moving path of the ejector plate 6. In this embodiment, there are two limiting mechanisms 11, which are symmetrically arranged on both sides of the ejector plate 6, so that the ejector plate 6 is evenly stressed when it contacts the blocking block 12. In addition, the ejector plate 6 is provided with an oblique groove 64 corresponding to the blocking block 12, for the end of the blocking block 12 to be inserted to limit the movement of the ejector plate 6, and the end of the blocking block 12 is correspondingly provided with an inclined abutting surface 14, and the abutting surface 14 is abutted against the oblique groove 64 to ensure that the ejector plate 6 can be tightly abutted against the blocking block 12 before the mold is opened, and remain stable. Before mold opening, the cylinder pushes the blocking block 12 to move toward the ejector plate 6, so that the end of the blocking block 12 is inserted into the inclined groove 64 and abuts against the ejector plate 6; after mold opening, when the injection molded part 5 is pulled out of the deep cavity 41 by the undercut portions 34 on each auxiliary insert 33, that is, the injection molded part 5 is separated from the rear mold core 4, the cylinder can drive the blocking block 12 to move away from the ejector plate 6, and then the ejector plate 6 can move toward the rear mold plate 2 under the action of the pull rod 62, driving the end of the ejector 36 and the auxiliary insert 33 on the inclined ejector rod 37 to eject the injection molded part 5 from the main insert 32, thereby completing the demolding of the injection molded part 5.

[0048] Reference Figure 2The injection mold further includes a plug-in block assembly 100 and a plug-in shaft assembly 200. The plug-in block assembly 100 is used to mold the outer wall surface of the rotating shaft seat 52 of the injection molded part 5, and the plug-in shaft assembly 200 is used to mold the shaft hole of the rotating shaft seat 52 of the injection molded part 5. Each insert 31 is equipped with a plug-in block assembly 100 and a plug-in shaft assembly 200. The first sub-inserted block 33 is used to mold the inner wall surface of the rotating shaft seat 52 of the injection molded part 5. The plug-in block assembly 100, the plug-in shaft assembly 200 and the first sub-inserted block 33 cooperate to mold the rotating shaft seat 52 of the injection molded part 5.

[0049] Specifically, refer to Figure 13-15 The plug-in block assembly 100 includes a plug-in block 101, a first sliding block 102, a first pushing block 103 and an exit spring 104. The plug-in block 101 is connected to the first sliding block 102, the first sliding block 102 is horizontally slidably installed in the front template 1, the first pushing block 103 is fixedly installed in the rear template 2, a side wall of the first sliding block 102 away from the plug-in block 101 is set as a first inclined surface 105, and a first pushing surface 106 is set on the side wall of the first pushing block 103 corresponding to the first inclined surface 105. The exit spring 104 is installed in the first sliding block 102, one end of the exit spring 104 abuts against the outer wall of the front mold core 3, and the other end abuts against the inner wall of the mounting hole of the first sliding block 102, so that the first sliding block 102 has a tendency to move away from the front mold core 3. When the rear template 2 and the front template 1 are molded together, the first pushing surface 106 on the first pushing block 103 abuts against the first inclined surface 105 on the first sliding block 102, and pushes the first sliding block 102 to move toward the injection cavity, so that the plug-in block 101 is inserted into the injection cavity to form the outer wall surface of the rotating shaft seat 52 of the injection molded part 5. When the rear template 2 and the front template 1 are molded together, the first pushing block 103 moves away from the first sliding block 102, and the first sliding block 102 moves away from the front mold core 3 under the action of the exit spring 104, so that the plug-in block 101 exits the injection cavity.

[0050] Reference Fig.16 and Fig.17The plug-in shaft assembly 200 includes a plug-in shaft 201, a second sliding block 202, a second pushing block 203, a third pushing block 204 and a driving inclined rod 205. The plug-in shaft 201 is fixedly connected to the second sliding block 202, and the second sliding block 202 is horizontally slidably installed on the front template 1. The second sliding block 202 is provided with an axially inclined plug-in hole 206. The second pushing block 203 is fixedly installed on the rear template 2, and the driving inclined rod 205 is installed on the second pushing block 203 for inserting into the plug-in hole 206. The second pushing block 203 moves along the direction of the rear template 2 to close or open the mold, so that the driving inclined rod 205 slides relative to the plug-in hole 206, thereby pushing the second sliding block 202 to move in the horizontal direction, thereby realizing the action of inserting the plug-in shaft 201 into or out of the injection cavity. A side wall of the second sliding block 202 away from the plug hole 206 is provided as a second inclined surface 207, and the third pushing block 204 is fixedly mounted on the rear mold plate 2, and is correspondingly provided with a positioning surface 208 abutting against the second inclined surface 207. The positioning surface 208 abuts against the second inclined surface 207, so that the position of the second sliding block 202 after mold closing is accurate, and the second sliding block 202 is limited to move slightly in the horizontal direction, so as to ensure that the plug shaft 201 can be plugged in place.

[0051] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes may be made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. An injection mold for molding high-gloss mirror products, characterized in that: The invention comprises a front mold core and a rear mold core, wherein the front mold core is provided with an insert, and the rear mold core is provided with a deep cavity. The insert is used to be inserted into the deep cavity and a gap is left between the insert and the inner wall of the deep cavity to form an injection cavity. The insert is provided with a plurality of undercuts at intervals along the circumferential direction, and a buckling relationship is formed between each of the undercuts and the molded injection molded part so that the undercuts can drive the molded injection molded part to separate from the inner wall of the deep cavity.

2. The injection mold for molding high-gloss mirror products according to claim 1, characterized in that: The insert includes a main insert and a plurality of auxiliary inserts, wherein the plurality of auxiliary inserts are embedded in the main insert at intervals along the circumferential direction, and the auxiliary inserts can move relative to the main insert and protrude from the main insert so that the molded injection molded part can be separated from the main insert, and the undercut portion is arranged on the auxiliary insert.

3. The injection mold for molding high-gloss mirror products according to claim 2, characterized in that: The undercut portion is in a transverse bar structure, and the transverse direction of the transverse bar structure is perpendicular to the direction of mold closing or mold opening movement.

4. The injection mold for molding high-gloss mirror products according to claim 3, characterized in that: The undercut portion has a force-applying surface for applying a force to the injection molded part away from the rear mold core when the mold is opened. The force-applying surface is a side wall surface of the undercut portion away from the rear mold core. The force-applying surface is inclined, with its inclined upper end close to the outer wall of the auxiliary insert and its inclined lower end away from the outer wall of the auxiliary insert. The angle between the force-applying surface and the horizontal plane is between 8-12°.

5. The injection mold for molding high-gloss mirror products according to claim 4, characterized in that: On the cross section of the undercut portion, the vertical projection length of the distance from the inclined lower end point to the inclined upper end point of the force-applying surface is between 0.2-0.3 mm.

6. The injection mold for molding high-gloss mirror products according to claim 2, characterized in that: The injection mold further includes a front template, a rear template, a return spring, a tie rod, an ejector and an ejector plate, the front mold core is arranged in the front template, the rear mold core is arranged in the rear template, and the ejector plate is movably arranged in the front template along the mold closing or mold opening direction; one end of the tie rod is connected to the ejector plate, and the other end extends into the rear template, and a limiting portion is arranged at the end of the tie rod extending into the rear template, and a blocking portion that limits the tie rod from being separated from the rear template is arranged in a through hole in the rear template for the tie rod to movably pass through, so that the rear template can drive the tie rod to move through the blocking portion during the mold opening process. The ejector plate is moved toward the rear template; the return spring is arranged in the front template to apply elastic force to the ejector plate away from the rear template, so that the ejector plate returns to its original position without being affected by the pulling force of the pull rod; one end of the ejector is connected to the ejector plate, and the other end is movably embedded in the main insert, so that one end surface of the ejector and the main insert are used together to form the inner wall surface of the injection molded part; each of the auxiliary inserts is connected to an inclined ejector rod, and the inclined ejector rod is connected to the ejector plate; the ejector and the inclined ejector rod move with the ejector plate, so that the end of the ejector and the auxiliary insert are embedded or protruded from the main insert.

7. The injection mold for molding high-gloss mirror products according to claim 6, characterized in that: The front template is also provided with a limiting mechanism for limiting the movement of the ejector plate before the mold is opened.

8. The injection mold for molding high-gloss mirror products according to claim 7, characterized in that: The limiting mechanism comprises a blocking block and a driving member, and the driving member drives and connects the blocking block so that the blocking block can block the moving path of the ejector plate or be separated from the moving path of the ejector plate.

9. The injection mold for molding high-gloss mirror products according to claim 1, characterized in that: The injection mold further comprises a plug-in block assembly, wherein the plug-in block assembly comprises a plug-in block, and the plug-in block can be movably inserted into or removed from the injection cavity to form the outer wall surface of the rotating shaft seat of the injection molded part.

10. The injection mold for molding high-gloss mirror products according to claim 1, characterized in that: The injection mold further comprises a plug-in shaft assembly, wherein the plug-in shaft assembly comprises a plug-in shaft, and the plug-in shaft can be movably inserted into or removed from the injection cavity to form the shaft hole of the rotating shaft seat of the injection molded part.

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