A mechanism for demolding a reverse buckle of an injection mold

Abstract

The application discloses a back-off demolding mechanism of an injection mold, comprising a mold body, a first core block and a second core block, wherein the mold body comprises a fixed mold and a movable mold, the first core block is slidably installed on the movable mold and used for forming a first back-off of a product, the second core block is slidably installed on the movable mold and used for forming a second back-off of the product, and the second core block is connected with the first core block through a guide structure. The application has the beneficial effects that: the guide structure is arranged between the first core block and the second core block, when the mold is opened, the demolding action of the first core block can drive the second core block to move and demold through the guide structure, so that the second core block does not need a driving source to drive demolding, thereby simplifying the internal structure of the mold, and the mechanical structure cooperation is stable and has low failure rate.

Description

Technical Field

[0001] This application relates to the field of mold technology, and in particular to an undercut demolding mechanism for injection molds. Background Technology

[0002] like Figure 1 The diagram shows the structure of an injection-molded product 1. The product 1 has a first undercut 101 and a second undercut 102 on its inner side. The opening directions of the first undercut 101 and the second undercut 102 are different, meaning the cores corresponding to the two undercuts move in different directions during demolding. Traditional molds use multiple drive sources to drive the corresponding cores for demolding, but this arrangement leads to a complex internal mold structure and a high failure rate. Therefore, how to improve existing molds to overcome these problems is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0003] One of the objectives of this application is to provide an undercut demolding mechanism for injection molds with a simple structure.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows: a mold body, a first core block, and a second core block. The mold body includes a fixed mold and a moving mold. The first core block is slidably mounted on the moving mold and used for forming a first undercut of the product. The second core block is slidably mounted on the moving mold and used for forming a second undercut of the product. The second core block is connected to the first core block through a guide structure. When the mold is opened, the first core block is adapted to demold from the first undercut along a first direction, and at this time, the second core block is adapted to demold from the second undercut along a second direction under the action of the guide structure.

[0005] Preferably, the guiding structure includes a guide rod and a guide groove disposed on the second core block, the guide rod being mounted on the first core block; during mold opening, the second core block is adapted to move in a second direction under the inclined sliding cooperation of the guide rod and the guide groove.

[0006] Preferably, the bottom end of the fixed mold is equipped with an inclined guide post, and the first core block is provided with an inclined guide groove; when the mold is opened, the first core block is adapted to move in a first direction under the sliding cooperation of the inclined guide post and the inclined guide groove.

[0007] Preferably, a limiting component is provided between the first core block and the moving mold, the limiting component being adapted to guide and limit the first core block so that the first core block can slide within a set range.

[0008] Preferably, the limiting component includes a limiting pin and a limiting track. The limiting pin is installed at the bottom end of the first core block, and the limiting track is detachably installed inside the moving mold. The limiting pin and the limiting track are inserted into each other.

[0009] Preferably, the limiting component further includes a locking member, which is installed at the end of the limiting track; after mold opening, the locking member is adapted to lock the limiting pin so that the first core block is locked in the mold opening position.

[0010] Preferably, the locking element includes a lock seat and a pair of lock blocks. The lock seat is mounted on the limiting track, and the lock blocks are elastically slidably mounted on the outside of the lock seat and disposed opposite to each other. The lock blocks are adapted to cover the outside of the limiting pin under the action of elastic force to lock the limiting pin.

[0011] Preferably, each of the locking blocks has an arc-shaped groove adapted to the limiting pin on its opposite side; and each of the locking blocks has a chamfered structure at a position away from the arc-shaped groove on its opposite side.

[0012] Compared with the prior art, the beneficial effects of this application are as follows:

[0013] (1) By setting a guide structure between the first core block and the second core block, the demolding action of the first core block can be driven by the guide structure to move and demold the second core block when the mold is opened. In this way, the second core block does not need a driving source to drive demolding, thereby simplifying the internal structure of the mold. Moreover, the mechanical structure is stable and has a low failure rate.

[0014] (2) By setting a limiting component, the limiting component can lock the first core block at the position when the mold is opened after the mold is opened, thereby preventing the first core block from falling down, so as to ensure that the inclined guide post and the inclined guide groove can be accurately and stably matched during subsequent mold closing, and prevent the occurrence of mold collision accidents. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the existing product structure.

[0016] Figure 2 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 3 This is a schematic diagram of the guide structure of this utility model.

[0018] Figure 4 This is a schematic diagram showing the state of the two core blocks during mold closing in this utility model.

[0019] Figure 5 This is a schematic diagram illustrating the working principle of the two core blocks during mold opening in this utility model.

[0020] Figure 6 This is a schematic diagram of the limiting component structure of this utility model.

[0021] Figure 7 This is a schematic diagram showing the state of the limiting component of this utility model when it is engaged with the bottom end of the first core block.

[0022] Figure 8 This is a schematic diagram illustrating the working principle of the limiting pin and locking fastener of this utility model.

[0023] Figure 9 This is a schematic diagram of the specific structure of the locking component of this utility model.

[0024] In the diagram: 1. Product; 101. First undercut; 102. Second undercut; 2. Moving mold; 3. First core block; 4. Second core block; 5. Guide structure; 501. Guide rod; 502. Guide groove; 6. Angled guide post; 7. Angled guide groove; 8. Limiting component; 801. Limiting pin; 802. Limiting track; 803. Locking fastener; 8031. Lock seat; 8032. Locking block; 9. Limiting spring; 10. Stop block. Detailed Implementation

[0025] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0026] In the description of this application, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this application.

[0027] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0028] One preferred embodiment of this application, such as Figures 1 to 9As shown, an undercut demolding mechanism for an injection mold includes a mold body, a first core block 3, and a second core block 4. The mold body includes a fixed mold (not shown) and a moving mold 2. The first core block 3 is slidably mounted on the moving mold 2 and is used to form a first undercut 101 for product 1. The second core block 4 is slidably mounted on the moving mold 2 and is used to form a second undercut 102 for product 1. The second core block 4 is connected to the first core block 3 through a guide structure 5.

[0029] Understandably, during mold opening, the first core block 3 will demold along the first direction with the first undercut 101. At this time, the second core block 4 can demold along the second direction with the second undercut 102 under the action of the guide structure 5. That is to say, the second core block 4 is linked with the first core block 3 through the guide structure 5. Under the action of the demolding force of the first core block 3, the second core block 4 can be demolded synchronously. In this way, the second core block 4 does not need a drive source (such as a hydraulic cylinder) to drive demolding, thereby simplifying the internal structure of the mold, and the mechanical structure has stable operation and low failure rate.

[0030] This application does not specifically limit the guide structure 5, but the following specific embodiment is provided for reference: Figure 3 As shown, the guide structure 5 includes a guide rod 501 and a guide groove 502 disposed on the second core block 4. The guide rod 501 is installed on the first core block 3, and the guide rod 501 is inserted into the guide groove 502 and has an inclined sliding fit with the guide groove 502.

[0031] like Figure 4 As shown, we will use a horizontally placed mold as an example. In this case, the first core block 3 is horizontally slidable, and the second core block 4 is tilted downwards and slidable. During demolding, as... Figure 5 As shown, the first core block 3 slides horizontally to the right along direction A. At the same time, the guide rod 501 acts on the guide groove 502, which causes the second core block 4 to slide downwards at an angle along direction B, thereby achieving simultaneous demolding of the two undercuts with different opening directions.

[0032] It should be understood that there can be various power sources to drive the first core block 3 to demold, such as using a hydraulic cylinder to drive the opening and closing of the mold of the first core block 3; however, in this application, a slanted guide mating structure is preferred (e.g., Figure 3 As shown in the diagram, a slanted guide post 6 is installed at the bottom of the fixed mold, and a slanted guide groove 7 is provided at the top of the first core block 3. It can be understood that during mold opening, the first core block 3 moves in the first direction through the sliding engagement of the slanted guide post 6 and the slanted guide groove 7.

[0033] Therefore, it is evident that neither the first type of core block 3 nor the second type of core block 4 requires electric drive. The first type of core block 3 operates through the mold-opening force between the moving mold 2 and the fixed mold, while the second type of core block 4 opens through the guide structure 5. This design significantly reduces the energy consumption and manufacturing cost of the mold, reduces the use of drive sources, simplifies the overall mold structure, and lowers maintenance costs. Moreover, the mechanical drive structure offers higher reliability and a lower failure rate compared to the electronic drive structure.

[0034] Based on the above embodiments, the mold is used in conjunction with an injection molding machine in actual use. That is, the mold is placed horizontally. If the first core block 3 is located on the "top side" (i.e., the first core block 3 is set upwards), gravity will cause the first core block 3 to sag naturally, tending to detach from the inclined guide post 6. If only the spring 9 is used, once the spring fails or fatigues, the first core block 3 will fall down. Consequently, during mold closing, the position of the sagling first core block 3 will shift, causing the inclined guide post 6 to directly collide with the first core block 3, resulting in a serious mold collision accident.

[0035] Therefore, in order to solve the above-mentioned technical problems, in one embodiment of this application, such as Figure 6 As shown, a limiting component 8 is provided between the first core block 3 and the moving mold 2. The limiting component 8 can guide and limit the first core block 3 so that the first core block 3 can slide within a set range. The limiting component 8 can also lock and limit the first core block 3 after the mold is opened to prevent the first core block 3 from falling, so as to ensure that the inclined guide post 6 and the inclined guide groove 7 can be accurately and stably matched during subsequent mold closing.

[0036] Specifically, the limiting component 8 includes a limiting pin 801, a limiting track 802, and a locking element 803. The limiting pin 801 is installed at the bottom of the first core block 3, and the limiting track 802 is detachably installed in the moving mold 2. The limiting pin 801 and the limiting track 802 are inserted into each other.

[0037] It is understandable that the limiting pin 801 can move along the limiting track 802, and the length of the limiting track 802 is the range of motion of the first core block 3. For example, when the limiting pin 801 is at the first end of the limiting track 802, the first core block 3 is in the mold-closed state; when the limiting pin 801 is at the second end of the limiting track 802, the first core block 3 is in the mold-open state. The locking fastener 803 locks the limiting pin 801 when it is in the mold-open state, so that the first core block 3 can be stably locked and limited to the mold-open position.

[0038] As a further description of the above embodiments: such as Figure 9As shown, the locking fastener 803 includes a lock seat 8031 ​​and a pair of lock blocks 8032. The lock seat 8031 ​​is installed on the limiting track 802, and the lock blocks 8032 are elastically slidably installed on the outside of the lock seat 8031 ​​and are arranged opposite to each other. Specifically, there are sliding grooves on both sides of the lock seat 8031, and a slider is provided on the outside of the lock blocks 8032. The slider slides with the sliding groove. Then, a limiting spring 9 is placed in the sliding groove. Finally, a stop block 10 is installed at the sliding groove for sealing. At this time, the two ends of the limiting spring 9 abut against the slider and the stop block 10 respectively. This elastic sliding installation method of the lock blocks 8032 facilitates assembly and disassembly.

[0039] like Figure 7 As shown, the two locking blocks 8032 are in a close-to-each-way state under the action of the limiting spring 9, and each of the two locking blocks 8032 has an arc-shaped groove adapted to the limiting pin 801 on its opposite side. A chamfered structure is also provided on the opposite side of each locking block 8032 at a position away from the arc-shaped groove. It can be understood that, as... Figure 8 As shown, when the limiting pin 801 at the bottom of the limiting track 802 moves upward to the top, the limiting pin 801 will first abut against the chamfer of the locking block 8032. Under the action of the squeezing force, the two locking blocks 8032 move away from each other. When the limiting pin 801 continues to move to the top, the two locking blocks 8032 will be reset under the elastic force of the limiting spring 9, so that the two locking blocks 8032 cover the outer position of the limiting pin 801 through the arc groove, so as to realize the limiting and locking of the limiting pin 801.

[0040] During mold closing, the inclined guide post 6 on the fixed mold precisely engages with the inclined guide groove 7 on the first core block 3. The first core block 3 moves downward under the action of the inclined guide post 6, and the driving force of the downward movement of the limiting pin 801 is greater than the limiting force of the limiting spring 9. This causes the limiting pin 801 to act on the two locking blocks 8032, moving them relatively away and forcibly downward, thereby achieving the mold closing action of the first core block 3. This locking component 803 design is not only simple in structure but also reliable in operation, effectively preventing the first core block 3 from falling due to gravity after mold opening, ensuring the stability and safety of the mold.

[0041] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A backing demolding mechanism for an injection mold, characterized in that, include: The mold body includes a fixed mold and a moving mold; A first core block, which is slidably mounted on the moving mold and used for the first undercut of the product; as well as The second core block is slidably mounted on the moving mold and used for the second undercut of the product. The second core block is connected to the first core block through a guide structure. During mold opening, the first core block is adapted to be demolded from the first undercut along the first direction, and the second core block is adapted to be demolded from the second undercut along the second direction under the action of the guide structure.

2. The undercut demolding mechanism of the injection mold as described in claim 1, characterized in that: The guiding structure includes a guide rod and a guide groove disposed on the second core block. The guide rod is installed on the first core block. During mold opening, the second core block is adapted to move in a second direction under the inclined sliding cooperation of the guide rod and the guide groove.

3. The undercut demolding mechanism of the injection mold as described in claim 2, characterized in that: The bottom end of the fixed mold is equipped with an inclined guide post, and the first core block is provided with an inclined guide groove; when the mold is opened, the first core block is adapted to move in a first direction under the sliding cooperation of the inclined guide post and the inclined guide groove.

4. The undercut demolding mechanism of the injection mold as described in claim 3, characterized in that: A limiting component is provided between the first core block and the moving mold. The limiting component is adapted to guide and limit the first core block so that the first core block can slide within a set range.

5. The undercut demolding mechanism of the injection mold as described in claim 4, characterized in that: The limiting component includes a limiting pin and a limiting track. The limiting pin is installed at the bottom end of the first core block, and the limiting track is detachably installed inside the moving mold. The limiting pin and the limiting track are inserted into each other.

6. The undercut demolding mechanism of the injection mold as described in claim 5, characterized in that: The limiting component also includes a locking element, which is installed at the end of the limiting track; after the mold is opened, the locking element is adapted to lock the limiting pin so that the first core block is locked in the mold opening position.

7. The undercut demolding mechanism of the injection mold as described in claim 6, characterized in that: The locking element includes a lock seat and a pair of lock blocks. The lock seat is mounted on the limiting track, and the lock blocks are elastically slidably mounted on the outside of the lock seat and disposed opposite to each other. The lock blocks are adapted to cover the outside of the limiting pin under the action of elastic force to lock the limiting pin.

8. The undercut demolding mechanism of the injection mold as described in claim 7, characterized in that: Each of the locking blocks has an arc-shaped groove on one side that matches the limiting pin; each of the locking blocks has a chamfered structure at a position away from the arc-shaped groove on the opposite side.

Images