Injection mold

Abstract

The utility model provides an injection mold, and relates to the technical field of vehicle part forming molds. The injection mold is used for forming a bumper with a clamping part and a shielding part and comprises a fixed mold, a movable mold, a first mold core and a second mold core, wherein the first mold core and the second mold core are arranged on the movable mold; a pushing part is arranged on the movable mold, and a sliding block and an elastic piece which are matched with the pushing part are arranged on the first mold core; during mold closing, the pushing part drives the sliding block to slide towards the second mold core and enables the elastic piece to store energy, the first mold core, the second mold core and the sliding block jointly form a clamping part forming cavity, and the second mold core and the fixed mold form a forming cavity of the shielding part; during mold opening, the elastic piece releases energy to push the sliding block to demold. According to the injection mold, the form that the sliding block is matched with the pushing part is adopted, the requirement for the precision of parts is low, the demolding action of the sliding block is simple and reliable, and the use stability of the mold is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle parts forming die technical field, especially a kind of injection mould for forming bumper. BACKGROUND

[0002] Bumper is the safety device of absorbing and mitigating external impact force, protecting the front and rear of vehicle body.The connection mode between common plastic bumper and vehicle body is usually buckle connection, that is, buckle is formed on the bumper.Some vehicles will set up shielding plate on the bumper to shield the buckle inside, so that the buckle is not exposed when the bumper is installed on the vehicle body.

[0003] There is an included angle between the extension direction of buckle and the bumper shielding plate, and the buckle hole on the buckle is a reverse structure, so the problem of reverse buckle hole needs to be solved when designing the mold.The conventional solution to this problem is to set up an inclined top and a straight top, and use the fixed mold to take out the part for demolding.

[0004] However, the precision of the inclined top is high, and the precision of the inclined top decreases after a long time of use, which may cause the quality of the bumper produced by the mold to decrease, and is not conducive to improving the stability of the mold. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model aims at providing an injection mold to improve the stability of the mold.

[0006] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0007] An injection mold is used for forming a bumper with a clamping part and a shielding part, the injection mold comprises a fixed mold and a movable mold, and the movable mold is provided with a first core, a second core, a pushing part, a slider in abutment with the pushing part, and an elastic member between the slider and the first core;

[0008] When the movable mold is closed, the pushing part can push the slider to slide towards the second core, and the elastic member is energized, and a first cavity for forming the clamping part is formed between the first core, the slider and the second core;

[0009] When the movable mold is opened, the elastic member releases energy to drive the slider away from the second core, and a second cavity in communication with the first cavity is formed between the second core and the fixed mold, and the second cavity is used for forming the shielding part.

[0010] Further, a guide structure is provided between the movable mold and the first core, and the guide structure comprises a guide rod provided on the movable mold and a guide hole provided on the first core.

[0011] The guide rod is inserted into the guide hole and can guide the first core to slide relative to the movable mold.

[0012] Further, the pushing part comprises a pushing surface arranged obliquely on the guide rod, and the slider is provided with an abutting surface, and the slider abuts against the pushing surface through the abutting surface.

[0013] Further, the guide rod is detachably arranged on the movable mold.

[0014] Further, the slider is provided with a containing cavity which is open towards one side of the second core, and the first core is provided with a stop block arranged close to the opening;

[0015] One end of the elastic member abuts against the bottom wall of the containing cavity, and the other end of the elastic member abuts against the stop block.

[0016] Further, the elastic member comprises a spring arranged in the containing cavity.

[0017] Further, the stop block is detachably connected to the first core.

[0018] Further, the first core is provided with a limiting part which can abut against the slider to limit the sliding stroke of the slider away from the second core.

[0019] Further, the injection mold further comprises a movable mold base for mounting the movable mold, and a first ejector rod fixing part and a second ejector rod fixing part which are slidingly arranged on the movable mold base;

[0020] The first ejector rod fixing part is provided with a first ejector rod which penetrates through the movable mold and is connected to the first core;

[0021] The second ejector rod fixing part is provided with a second ejector rod which penetrates through the movable mold and the first core and is connected to the second core.

[0022] Further, the movable mold is embedded with a first guide sleeve, and the first ejector rod is arranged in the first guide sleeve.

[0023] Further, the first core is embedded with a second guide sleeve, and the movable mold is embedded with a third guide sleeve, and the second ejector rod penetrates through the second guide sleeve and the third guide sleeve.

[0024] Further, the second ejector rod fixing part is arranged on one side of the first ejector rod fixing part towards the movable mold, and the second ejector rod fixing part is provided with a space part for avoiding the first ejector rod fixing part.

[0025] Further, the movable die seat is provided with a support rod, the support rod is arranged through the first ejector rod fixing part and the second ejector rod fixing part, and is used for supporting the movable die.

[0026] Compared with the prior art, the utility model has the following advantages:

[0027] The injection mold, through the setting slider, can form the reverse buckle structure of the clamping part, and through the setting of the mutually matched push part, slider and elastic element, the movable die can be moved to open the mold, the slider is moved to separate from the reverse buckle structure of the clamping part, the first core and the second core will not be pulled apart when separating from the bumper, the slider cooperation push part is adopted, the precision requirement of the part is lower than that of the inclined ejector, the slider demolding action is simple and reliable, and the use stability of the mold is improved.

[0028] Secondly, the guide rod is arranged on the movable die, the matched guide hole is arranged on the first core, the first core can be guided when moving, the first core moves more smoothly and stably, the push surface in contact with the abutting surface of the slider is arranged on the guide rod, the abutting surface and the push surface can slide relative to each other when the push part pushes the slider, and the push part drives or guides the slider. The guide rod is detachably arranged on the movable die, so that the mold can be conveniently assembled. The accommodating cavity is arranged in the slider, the mounting space of the elastic element is provided, and the elastic element can realize the elastic push action on the slider in cooperation with the stop block. The elastic element includes a spring, the spring has relatively stable elastic force output, the service life is relatively long, and the use stability of the mold is improved.

[0029] In addition, the stop block is detachably arranged on the first core, the slider can be disassembled relatively quickly after the stop block is disassembled, and the assembly convenience of the mold is improved. The limiting part is arranged, the maximum sliding amount of the slider can be controlled, the stroke of the slider is short, and the mold wear is reduced. The movable die seat is arranged, the connection base of the movable die is provided, the movable die is driven to move, the first ejector rod and the first ejector rod fixing part are arranged, the first core is driven to move, the second ejector rod and the second ejector rod fixing part are arranged, the second core is driven to move, and the bumper is demolded in stages.

[0030] Furthermore, the first guide sleeve is arranged, so that direct abrasion of the movable mold by the first ejector rod during movement of the first ejector rod relative to the movable mold is avoided. The second guide sleeve is arranged, so that direct abrasion of the first core by the second ejector rod during movement of the second ejector rod relative to the first core is avoided. The third guide sleeve is arranged, so that direct abrasion of the movable mold by the second ejector rod during movement of the second ejector rod relative to the movable mold is avoided. The second ejector rod fixing portion is arranged on the side of the first ejector rod fixing portion facing the movable mold, and the second ejector rod fixing portion is provided with a clearance portion, so that the second core does not interfere with the first ejector rod fixing portion during movement of the second core relative to the first core. The support rod is arranged, so that the movable mold is supported, the movable mold is not easily deformed during use, and the service life of the mold is improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] The accompanying drawings, which form a part of this description, are included to provide a further understanding of the present application, and are incorporated into and constitute a part of this application. The embodiments of the present application, and their

[0032] Figure 1 A partial cross-sectional structure schematic view of the bumper according to the embodiment of the present application;

[0033] Figure 2 A structure schematic view of the injection mold according to the embodiment of the present application;

[0034] Figure 3 A partial enlarged view of the middle A part; Figure 2

[0035] A partial enlarged view of the middle B part; Figure 4 Figure 2 A position relationship schematic view of the slider and the first core according to the embodiment of the present application;

[0036] Figure 5 A structure schematic view of the slider and the guide rod according to the embodiment of the present application.

[0037] Figure 6 Explanation of the reference signs:

[0038] The accompanying drawings, which form a part of this description, are included to provide a further understanding of the present application, and are incorporated into and constitute a part of this application. The embodiments of the present application, and their

[0039] 1, fixed mold;

[0040] 2, movable mold; 201, first guide sleeve; 202, third guide sleeve;

[0041] 3, first core; 301, sliding hole; 302, stop block; 303, limiting portion; 304, second guide sleeve; 305, guide hole;

[0042] 4, second core;

[0043] ​5, guide rod; 501, pushing surface; 502, gasket; 503, pressure ring;

[0044] 6, slider; 601, abutting surface; 602, accommodating cavity;

[0045] 7, elastic member;

[0046] 8, bumper; 801, clamping part; 8011, clamping hole; 802, shielding part;

[0047] 9, first top rod;

[0048] 10, second top rod;

[0049] 11, first top rod fixing part;

[0050] 12, second top rod fixing part;

[0051] 1201, yielding part;

[0052] 13, movable mold base; 1301, bottom plate; 1302, square iron; 1303, support rod;

[0053] 14, hot runner plate;

[0054] 15, panel. DETAILED DESCRIPTION

[0055] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0056] In the description of the utility model, it should be noted that if the terms indicating the orientation or position relationship such as "upper", "lower", "inner", "outer" appear, the orientation or position relationship shown in the drawing is based on, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as the limitation of the utility model. In addition, if the terms "first", "second" appear, they are also only for the description purpose, and cannot be understood as indicating or implying relative importance.

[0057] In addition, in the description of the utility model, unless otherwise explicitly limited, the terms "mounting", "connecting", "connection" and "connecting member" should be understood in a broad sense. For example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood in combination with the specific circumstances.

[0058] The utility model discloses below will refer to the accompanying drawing and combine the embodiment to explain in detail.

[0059] Some vehicles in order to let bumper and the body connection more beautiful, with reference to Figure 1 As shown, the blocking part is arranged on the bumper to shield the clamping part on the inner side, and the clamping part is not exposed when the bumper is installed on the vehicle body. There is an included angle between the extension direction of the clamping part and the blocking part, and the clamping hole on the clamping part is in a reverse buckling structure, so the problem of reverse buckling of the clamping hole needs to be solved when designing the mold.

[0060] For the above problems, the conventional solution is to set up an inclined top and a straight top in cooperation, and to adopt a mode of taking out parts by a fixed mold for demolding. However, the inclined top requires high precision, and after long-term use, the precision of the inclined top decreases, which may cause the quality of the bumper produced by the mold to decrease, and is not conducive to improving the stability of the mold in use.

[0061] The embodiment relates to an injection mold for improving the stability of the mold in use.

[0062] As a whole, in combination with Figures 1 to 3 As shown, the injection mold of the embodiment is used for forming a bumper 8 with a clamping part 801 and a blocking part 802, and the injection mold comprises a fixed mold 1 and a movable mold 2, and the movable mold 2 is provided with a first core 3, a second core 4, a pushing part, a sliding block 6 abutting against the pushing part, and an elastic piece 7 located between the sliding block 6 and the first core 3.

[0063] When the movable mold 2 is closed, the pushing part can push the sliding block 6 to slide towards the second core 4, and the elastic piece 7 stores energy, and a first cavity for forming the clamping part 801 is formed between the first core 3, the sliding block 6 and the second core 4. When the movable mold 2 is opened, the elastic piece 7 releases energy to drive the sliding block 6 to move away from the second core 4, and a second cavity for forming the blocking part 802 is formed between the second core 4 and the fixed mold 1, and the second cavity is in communication with the first cavity.

[0064] As above, the injection mold of the embodiment can form the reverse buckling structure of the clamping part 801 by arranging the sliding block 6, and by arranging the pushing part, the sliding block 6 and the elastic piece 7 in cooperation, the sliding block 6 can move away from the reverse buckling structure of the clamping part 801 when the movable mold 2 is opened, and the first core 3 and the second core 4 will not pull apart the clamping part 801 when they are separated from the bumper 8. The form of the sliding block 6 cooperating with the pushing part is simpler in structure than the form of the inclined top, occupies less space, and requires lower precision of parts. The demolding action of the sliding block 6 is simple and reliable, and can have good demolding effect after long-term use, which is conducive to improving the stability of the mold in use and reducing the appearance risk of the bumper 8.

[0065] Based on the above overall introduction, still referring to Figure 2 And Figure 3As shown, in particular, the injection mold in the embodiment is provided with a preset direction, which refers to the opening and closing direction of the movable mold 2, that is Figure 2 the up-down direction in the figure. The first core 3 and the fixed mold 1 form a third inner cavity, which is used for forming the main body part of the bumper 8, and the third inner cavity is communicated with the first inner cavity and the second inner cavity to form a "y" shaped cross section. Usually, the clamping part 801 on the bumper 8 is provided with a plurality of clamping holes 8011, and a plurality of groups of the combination of the pushing part, the sliding block 6 and the elastic member 7 can be provided to achieve the forming demolding at the clamping hole 8011 of the clamping part 801.

[0066] It should be noted that the mold opening and part taking process of the injection mold in the embodiment is as follows: first, the first core 3 and the second core 4 do not move relative to the fixed mold 1, and the movable mold 2 is lowered. During the lowering of the movable mold 2, the elastic member 7 is energized to drive the sliding block 6 away from the second core 4, and the sliding block 6 is out of the position of the clamping hole 8011 on the clamping part 801. Then, the movable mold 2 stops moving, the first core 3 moves downward to separate from the bumper 8. Then, the first core 3 stops moving, the second core 4 moves downward to separate from the bumper 8, and at this time the bumper 8 is left in the fixed mold 1. Finally, the bumper 8 can be taken out of the fixed mold 1 by using a mechanical hand. The mold closing process of the injection mold in the embodiment is as follows: the movable mold 2 is raised, and during the raising of the movable mold 2, the first core 3 and the second core 4 are abutted against the fixed mold 1 and are pushed back into the movable mold 2 by the fixed mold 1 to reset, the pushing part pushes the sliding block 6 to slide to make the sliding block 6 abut against the second core 4, and the elastic member 7 is energized.

[0067] Secondly, the fixed mold 1 is connected with a hot runner plate 14 away from the movable mold 2, and the hot runner plate 14 is connected with a face plate 15 away from the fixed mold 1. The hot runner plate 14 is provided with a flow channel for distributing the plastic melt during injection, and the hot runner plate 14 is also provided with a heating element such as a heating rod for controlling the temperature of the melt. The face plate 15 is used to fix the hot runner plate 14 and the fixed mold 1, and mainly plays a role of structural support. The specific structure of the hot runner plate 14 and the face plate 15 can be set by using a conventional setting mode, which will not be described in detail in the embodiment.

[0068] Preferably, in order to improve the stability of the relative movement between the first core 3 and the movable mold 2, a guide structure is arranged between the movable mold 2 and the first core 3, which includes a guide rod 5 arranged on the movable mold 2 and a guide hole 305 arranged on the first core 3. The guide rod 5 is inserted into the guide hole 305 and can guide the sliding of the first core 3 relative to the movable mold 2. The guide rod 5 is a column, and the guide rod 5 is arranged on the movable mold 2 and the matching guide hole 305 is arranged on the first core 3, which can guide the movement of the first core 3 and make the movement of the first core 3 more smooth and stable.

[0069] Specifically, in combination with Figure 5 and Figure 6As shown, the pushing part includes a pushing surface 501 arranged obliquely on the guide rod 5, and the sliding block 6 is provided with an abutting surface 601, and the abutting surface 601 abuts against the pushing surface 501. The pushing surface 501 on the guide rod 5 is in contact with the abutting surface 601 of the sliding block 6, and the abutting surface 601 and the pushing surface 501 can slide relative to each other when the pushing part pushes the sliding block 6. When the movable die 2 moves away from the fixed die 1, the elastic member 7 acts on the sliding block 6 to make the abutting surface 601 always in contact with the pushing surface 501, and the pushing surface 501 plays a role of guiding and limiting the sliding distance of the sliding block 6 during the downward movement of the guide rod 5 along with the movable die 2. When the first core 3 moves towards the movable die 2, the pushing surface 501 pushes the abutting surface 601, so that the sliding block 6 is pushed to move towards the second core 4.

[0070] In detail, the specific form of the pushing surface 501 can be an inclined plane or an inclined curved surface, as long as the position of the pushing surface 501 in contact with the abutting surface 601 is gradually higher in the direction away from the sliding block 6. In the embodiment, the pushing surface 501 and the abutting surface 601 are both inclined planes, and the included angle θ between the pushing surface 501 and the preset direction is between 20° and 60°, and the more preferable range is between 20° and 45°, and in the embodiment, θ is 20°.

[0071] Secondly, based on the purpose of improving the convenience of disassembling the guide rod 5, Figure 2 and Figure 4 As shown, the guide rod 5 is detachably arranged on the movable die 2. The guide rod 5 is provided with a gasket 502, a pressing ring 503 and a bolt. The side wall of the movable die 2 facing the first core 3 is provided with a groove, and the gasket 502 is arranged at the bottom of the groove. The bottom end of the guide rod 5 is provided with a flange and abuts against the gasket 502. The pressing ring 503 is sleeved on the guide rod 5, and the threaded end of the bolt penetrates the pressing ring 503, the gasket 502 and the movable die 2 in sequence and is screwed to the movable die 2, so that the pressing ring 503 can press the flange of the guide rod 5 tightly on the gasket 502, and the fixation of the guide rod 5 is realized.

[0072] For example, the specific structure of the sliding block 6 is described with reference to Figure 3 and Figure 5As shown, the slider 6 of the embodiment is provided with a containing cavity 602, which is open to one side of the second core 4, and the first core 3 is provided with a stop block 302 arranged close to the opening. One end of the elastic member 7 abuts against the bottom wall of the containing cavity 602, and the other end of the elastic member 7 abuts against the stop block 302. The elastic member 7 is compressed between the stop block 302 and the inner bottom wall of the containing cavity 602, and provides a pushing force to the slider 6 in a direction away from the second core 4, so that the slider 6 keeps in contact with the pushing part during movement. The containing cavity 602 provided in the slider 6 can provide installation space for the elastic member 7, and the stop block 302 can realize the elastic force of the elastic member 7 on the slider 6. It can be understood that the elastic member 7 can also be arranged in a stretched state, so that the elastic member 7 provides a pulling force to the slider 6 away from the second core 4. The specific supporting structure can be designed according to actual needs, and the embodiment will not be described here.

[0073] Among them, for the selection of the elastic member 7, the elastic member 7 of the embodiment includes a spring in the containing cavity 602. The spring has a relatively stable elastic force output and a relatively long service life, which is beneficial to improve the stability of the mold. Of course, the elastic member 7 can also be selected from elastic bodies such as rubber and silicone, as long as it can meet the above-mentioned elastic force exertion on the slider 6.

[0074] Secondly, as a further optimization of the structure of the stop block 302, the stop block 302 is detachably connected to the first core 3. Through the detachable setting of the stop block 302 on the first core 3, the slider 6 can be disassembled relatively quickly after the stop block 302 is removed, which is beneficial to improve the assembly convenience of the mold. Specifically, the first core 3 is provided with a sliding hole 301, the slider 6 is slidingly arranged in the sliding hole 301, and the stop block 302 is arranged at the opening of the sliding hole 301 and can be embedded on the first core 3. The stop block 302 does not protrude from the surface of the first core 3, and the first core 3 is preferably connected to the first core 3 by bolts.

[0075] In addition, in order to limit the sliding amount of the slider 6, in combination with Figure 3 and Figure 6 As shown, the first core 3 is provided with a limiting portion 303, which can abut against the slider 6 to limit the sliding stroke of the slider 6 in the direction away from the second core 4. The limiting portion 303 can control the maximum sliding amount of the slider 6, and the stroke of the slider 6 is short, which is beneficial to reduce the wear of the mold. Specifically, the limiting portion 303 of the embodiment is provided in the form of a limiting surface, and when the slider 6 abuts against the limiting surface, it reaches the limit position of the slider 6. The limiting surface is also the bottom surface of the insertion hole. It can be easily understood that when the slider 6 abuts against the second core 4, the distance a between the slider 6 and the limiting surface should be not less than the hole depth of the clamping hole 8011, so as to ensure that the slider 6 can smoothly escape from the clamping hole 8011 to form the inverted buckle structure.

[0076] Optionally, the injection mold further includes a moving mold base 13 for mounting the moving mold 2, and a first ejector pin fixing part 11 and a second ejector pin fixing part 12 slidably disposed on the moving mold base 13. The first ejector pin fixing part 11 is provided with a first ejector pin 9, which passes through the moving mold 2 and is connected to the first core 3. The second ejector pin fixing part 12 is provided with a second ejector pin 10, which passes through both the moving mold 2 and the first core 3 and is connected to the second core 4. The moving mold base 13 provides a connection foundation for the moving mold 2, facilitating its movement. The first ejector pin 9 and the first ejector pin fixing part 11 enable the movement of the first core 3, and the second ejector pin 10 and the second ejector pin fixing part 12 enable the movement of the second core 4, thus achieving phased demolding of the bumper 8.

[0077] Regarding the specific structure of the moving mold base 13, please refer to... Figure 2 As shown, the moving mold base 13 includes a square iron block 1302, a base plate 1301, and a support rod 1303. One end of the square iron block 1302 is connected to the moving mold 2, and the other end is connected to the base plate 1301, forming a movement space between the square iron block 1302 and the base plate 1301 for the first ejector pin fixing part 11 and the second ejector pin fixing part 12 to move. The base plate 1301 is connected to the injection molding machine, and the injection molding machine drives the moving mold 2 to move by moving the base plate 1301.

[0078] Secondly, as an optimization of the connection between the first ejector pin 9 and the moving mold 2, a first guide sleeve 201 is embedded in the moving mold 2, and the first ejector pin 9 passes through the first guide sleeve 201. The first guide sleeve 201 can improve the accuracy of the first ejector pin 9 when moving relative to the moving mold 2, while avoiding direct contact between the moving mold 2 and the first ejector pin 9 to prevent wear.

[0079] Accordingly, to optimize the connection between the second ejector pin 10 and the first core 3 and the moving mold 2, a second guide sleeve 304 is embedded in the first core 3, and a third guide sleeve 202 is embedded in the moving mold 2. The second ejector pin 10 passes through both the second guide sleeve 304 and the third guide sleeve 202. The second guide sleeve 304 improves the accuracy of the second ejector pin 10 when moving relative to the first core 3 or the moving mold 2, while preventing direct contact between the moving mold 2, the first core 3, and the first ejector pin 9, thus avoiding wear. In this embodiment, the first guide sleeve 201, the second guide sleeve 304, and the third guide sleeve 202 are all made of wear-resistant metal materials, such as stainless steel, which have good wear resistance.

[0080] Further, for the arrangement of the first ejector pin fixing part 11 and the second ejector pin fixing part 12, the second ejector pin fixing part 12 is arranged on the side of the first ejector pin fixing part 11 facing the movable mold 2, and the second ejector pin fixing part 12 is provided with a displacement part 1201 avoiding the first ejector pin fixing part 11. Arranging the second ejector pin fixing part 12 on the side of the first ejector pin fixing part 11 facing the movable mold 2 and providing the displacement part 1201 on the second ejector pin fixing part 12 can make the second core 4 not interfere with the first ejector pin fixing part 11 when moving relative to the first core 3. Specifically, the displacement part 1201 is in the form of a displacement hole, that is, the first ejector pin 9 passes through the displacement hole to connect the first core 3 through the second ejector pin fixing part 12.

[0081] Further, for the purpose of prolonging the service life of the mold, the movable mold base 13 is provided with a support rod 1303 penetrating through the first ejector pin fixing part 11 and the second ejector pin fixing part 12 and used for supporting the movable mold 2. One end of the support rod 1303 is fixedly connected to the bottom plate 1301, and the other end is supported on the side of the movable mold 2 away from the fixed mold 1, which can share the injection pressure of the movable mold 2 during injection, so that the movable mold 2 is not easy to deform, which is beneficial to maintaining the mold precision and prolonging the service life. The support rod 1303 can also guide the first ejector pin fixing part 11 and the second ejector pin fixing part 12.

[0082] The injection mold of the embodiment can make the movable mold 2 move away from the mold when the sliding block 6 moves away from the undercut structure of the clamping part 801 by the cooperation of the push part, the sliding block 6 and the elastic member 7, which does not affect the subsequent disengagement of the first core 3 and the second core 4 from the bumper 8. Compared with the inclined ejector pin, the injection mold has lower requirements for the part precision and better demolding effect in long-term use, which is beneficial to improving the use stability of the mold.

[0083] The above only describes the preferred embodiments of the utility model and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. An injection mold for molding a bumper (8) having a snap-fit ​​portion (801) and a blocking portion (802), characterized in that: It includes a fixed mold (1) and a moving mold (2), and the moving mold (2) is provided with a first core (3), a second core (4), a push part, a slider (6) that abuts against the push part, and an elastic member (7) located between the slider (6) and the first core (3); When the moving mold (2) is closed, the pusher can push the slider (6) to slide towards the second core (4), and the elastic element (7) stores energy. The first core (3), the slider (6) and the second core (4) form a first cavity for forming the snap-fit ​​part (801). When the moving mold (2) opens, the elastic element (7) releases energy to drive the slider (6) away from the second core (4), and the second core (4) and the fixed mold (1) form a second cavity that communicates with the first cavity. The second cavity is used to form the shielding part (802).

2. The injection mold according to claim 1, characterized in that: A guide structure is provided between the moving mold (2) and the first core (3). The guide structure includes a guide rod (5) provided on the moving mold (2) and a guide hole (305) provided on the first core (3). The guide rod (5) is inserted into the guide hole (305) and can guide the first core (3) to slide relative to the moving mold (2).

3. The injection mold according to claim 2, characterized in that: The pushing part includes a pushing surface (501) arranged obliquely on the guide rod (5), and the slider (6) is provided with an abutting surface (601). The slider (6) abuts against the pushing surface (501) through the abutting surface (601).

4. The injection mold according to claim 2, characterized in that: The guide rod (5) is detachably mounted on the moving mold (2).

5. The injection mold according to claim 1, characterized in that: The slider (6) is provided with a receiving cavity (602), which is open on one side facing the second core (4), and the first core (3) is provided with a stop block (302) arranged near the opening; One end of the elastic element (7) abuts against the bottom wall of the receiving cavity (602), and the other end of the elastic element (7) abuts against the stop block (302).

6. The injection mold according to claim 5, characterized in that: The elastic element (7) includes a spring located in the receiving cavity (602); and / or, The stop (302) is detachably connected to the first core (3).

7. The injection mold according to claim 1, characterized in that: The first core (3) is provided with a limiting part (303), which can abut against the slider (6) and limit the sliding stroke of the slider (6) in a direction away from the second core (4).

8. The injection mold according to any one of claims 1-7, characterized in that: It also includes a moving mold base (13) for mounting the moving mold (2), and a first ejector rod fixing part (11) and a second ejector rod fixing part (12) slidably disposed on the moving mold base (13); The first ejector rod fixing part (11) is provided with a first ejector rod (9), which passes through the moving mold (2) and is connected to the first core (3); The second push rod fixing part (12) is provided with a second push rod (10), which passes through the moving mold (2) and the first core (3) and is connected to the second core (4).

9. The injection mold according to claim 8, characterized in that: The moving mold (2) is fitted with a first guide sleeve (201), and the first push rod (9) passes through the first guide sleeve (201); and / or, The first core (3) is fitted with a second guide sleeve (304), the moving mold (2) is fitted with a third guide sleeve (202), and the second push rod (10) is arranged to pass through the second guide sleeve (304) and the third guide sleeve (202).

10. The injection mold according to claim 8, characterized in that: The second ejector pin fixing part (12) is provided on the side of the first ejector pin fixing part (11) facing the moving mold (2), and the second ejector pin fixing part (12) is provided with a clearance part (1201) to avoid the first ejector pin fixing part (11); and / or, The moving mold base (13) is provided with a support rod (1303), which passes through the first push rod fixing part (11) and the second push rod fixing part (12) and is used to support the moving mold (2).

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