Automobile back-off demolding device

Abstract

The utility model aims to provide an automobile back-off demoulding device which comprises a front mould, a guide rod arranged in an inner cavity of the front mould and an elastic piece connected with the guide rod, one end of the elastic piece is connected with the guide rod, the other end of the elastic piece is connected with a buffer patch, and the buffer patch is used for abutting against a back-off. The device can protect the inverted buckle in the process of demolding the inverted buckle relative to the front mold, so that the yield of the inverted buckle of a product is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to an undercut demoulding device. Background Art

[0002] With the improvement of production technology, people's requirements for product appearance are also increasing. Injection molding is a processing method used in mass production of certain complex-shaped parts, so injection molds are very commonly used in modern manufacturing industries, such as the automotive industry.

[0003] In the automotive manufacturing industry, there are many small parts in many places. For example, there are many small undercuts around the car bumper. The small structure makes demolding difficult. The traditional mold design uses an inner slider and a slanted top to remove the undercuts. When the mold is opened and forced to be demolded, the front mold and the rear mold are separated to both sides. The undercut is formed on the front mold and moves with the front mold. The rear mold generates a pulling force on the undercut away from the front mold, and the slanted top gives the undercut a pushing force away from the front mold through the inner slider. The two forces act on the undercut at the same time to make the undercut detach from the mold.

[0004] This method can make the undercut of the utility model be smoothly detached from the mold, but there are certain technical defects: during the demolding process of the undercut relative to the front mold, the undercut is simultaneously subjected to two forces in the same direction, the undercut is easily deformed, and the shape of the undercut cannot be guaranteed.

[0005] The utility model aims to provide an automobile undercut demoulding device, which can protect the undercut during demoulding relative to a front mold, thereby improving the yield rate of the undercut product. Utility Model Content

[0006] The above technical objectives of the utility model are achieved through the following technical solutions:

[0007] A car undercut demoulding device comprises a front mold, and is characterized in that it also comprises a guide rod arranged in the inner cavity of the front mold and an elastic member connected to the guide rod, wherein one end of the elastic member is connected to the guide rod, and the other end is connected to a buffer patch, and the buffer patch is used to abut against the undercut.

[0008] The elastic member may be an elastic column, or a spring or an elastic pin. It is connected to the guide rod. There are two stages when the undercut is demoulded relative to the front mold. Stage 1: The elastic force provided by the elastic member acts on the undercut through the buffer patch, and at the same time, the rear mold also generates a pulling force on the undercut. Stage 2: As the undercut continues to move away from the front mold, it exceeds the maximum length of the elastic member. At this time, the undercut is no longer subject to the elastic force, and the pulling force of the rear mold on the undercut continues to exist.

[0009] Such a structure has the following technical effects: First, the process of the undercut leaving the front mold is divided into two stages. Only in the first stage is the undercut subjected to two forces in the same direction, and in the second stage is the undercut subjected to only one force, so the undercut is protected. Secondly, one of the forces in the first stage comes from the elastic force provided by the elastic part, and the user can easily set this initial elastic force by setting the model and elastic stroke of the elastic part, so that the elastic force on the undercut is of appropriate size and not easily damaged. Thirdly, the elastic force is applied to the undercut through the buffer patch to further protect the undercut. This prevents the undercut from being detached from the front mold and the rear mold at one time, causing the undercut to be deformed, thereby improving the yield rate of the undercut product.

[0010] As a preferred embodiment of the present invention, a receiving groove is provided on the outer surface of the guide rod, and the elastic member is partially arranged in the receiving groove.

[0011] By optimizing the frictional force, a groove of suitable length is provided on the guide rod, and a part of the elastic member, i.e., the tail end, is arranged in the groove, so that the contact area between the guide rod and the elastic member is minimized, and the friction loss of the elastic member during operation can be minimized. Reducing the frictional force can not only improve the movement efficiency of the elastic member. Frictional force is one of the main reasons for the surface wear of the elastic member. By reducing the frictional force, the surface wear of the elastic member can be reduced, its service life can be extended, and the cost of maintenance and replacement can be reduced.

[0012] As a preferred embodiment of the present invention, the guide rod is provided with a hollow cavity, and the elastic member is arranged in the hollow cavity of the guide rod.

[0013] The elastic member is placed in the inner cavity of the guide rod so that the elastic member can move inside and along the guide rod, so that the movement trajectory of the elastic member is limited in the inner cavity of the guide rod, thereby preventing the elastic member from deviating from the track or rubbing against the front mold to cause the elastic member to malfunction, resulting in forced interruption of demolding.

[0014] As a preferred embodiment of the utility model, it further comprises a spring, one end of the spring is connected to the elastic member, and the other end of the spring is connected to a side of the guide rod away from the buffer patch.

[0015] When the mold is opened and forced to be demolded, the undercut moves in the direction away from the front mold when subjected to the pulling force of the rear mold. At this time, the buffer patch gives the undercut an elastic thrust away from the front mold. The elastic thrust is provided by the elastic part and the spring, and the elastic thrust is enhanced, thereby making the undercut demolding relative to the front mold smoother.

[0016] As a preferred embodiment of the present invention, a protection block is provided in the inner cavity of the front mold, and the guide rod is arranged in the protection block.

[0017] The guide rod is arranged in the protection block, so that the guide rod and the protection block become a whole, and the protection block is embedded in the inner cavity of the front mold. The protection block is determined according to the size of the guide rod. There are many parts in the front mold. The protection block is added outside the guide rod. On the one hand, it reduces the difficulty of designing and producing the mold. It is only necessary to design a rectangular block that meets the size of the guide rod. The front mold only needs to reserve the corresponding size, and there is no need to cooperate with the design of the space size that fits the shape of the guide rod, which reduces the difficulty of mold design and processing; on the other hand, it avoids friction loss between the guide rod and other parts inside the front mold.

[0018] As a preferred embodiment of the present invention, one end of the guide rod away from the buffer patch is provided with a step surface which is engaged with the step surface of the protection block.

[0019] The guide rod is clamped with the step surface of the protection block through the step surface. Since the guide rod has a certain inclination and needs to bear a part of the force during operation, the connection between the guide rod and the protection block can be made more stable by setting the step surface to be clamped with the step surface of the protection block, ensuring that the guide rod is stable and does not shake, thereby ensuring the normal operation of the device.

[0020] As a preferred embodiment of the utility model, an auxiliary sliding plate is provided on the side of the buffer patch that fits the undercut. The undercut is made of plastic material and is shaped after plastic cooling of the mold. However, in order to ensure work efficiency, it is impossible to wait for the undercut mold to be completely cooled before opening the mold. The undercut is demoulded after reaching the mold opening temperature. Since the undercut is made of plastic material, the structure of the plastic that has not been completely cooled is relatively unstable and is prone to deformation and adhesion with the buffer patch. The auxiliary sliding plate is added to the part in contact with the undercut to avoid the undercut and the buffer patch from adhering to each other and being difficult to detach, thereby causing the deformation of the undercut.

[0021] In summary, the utility model has the following beneficial effects:

[0022] 1. The guide rod is connected with the step surface of the protection block through the step surface, which can make the connection between the guide rod and the protection block more stable, ensure that the guide rod is stable without shaking, and ensure the normal operation of the device.

[0023] 2. A groove of appropriate length is provided on the guide rod, which can reduce the wear on the surface of the elastic part by reducing the friction, prolong the service life, and reduce the cost of maintenance and replacement.

[0024] 3. Place the elastic part in the inner cavity of the guide rod so that the elastic part can move along the guide rod inside the guide rod to prevent the elastic part from falling off the track or rubbing against the front mold, which may cause the elastic part to malfunction. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of Example 1.

[0026] Figure 2 Schematic diagram of the guide rod of Example 1.

[0027] Figure 3 Schematic diagram of the step surface of the guide rod in Example 1.

[0028] In the figure: 1. front mold, 2. buffer patch, 3. guide rod, 4. elastic part, 5. spring, 7. protection block. DETAILED DESCRIPTION

[0029] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0030] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0031] like Figure 2 As shown, the elastic member 4 can be an elastic column, or a spring or an elastic pin. It is connected to the guide rod 3. When the undercut is demoulded relative to the front mold 1, there are two stages. Stage 1: The elastic force provided by the elastic member 4 acts on the undercut through the buffer patch 2, and at the same time, the back mold also generates a pulling force on the undercut. Stage 2: As the undercut continues to move away from the front mold, it exceeds the maximum length of the elastic member 4. At this time, the undercut is no longer subjected to the elastic force, and the pulling force of the back mold on the undercut continues to exist.

[0032] like Figure 1 As shown, such a structure has the following technical effects: First, in the process of the undercut leaving the front mold 1, it is divided into two stages. Only in the first stage is the undercut subjected to two forces in the same direction, and in the second stage is the undercut subjected to only one force, so the undercut is protected. Secondly, one of the forces in the first stage comes from the elastic force provided by the elastic member 4, and the user can easily set this initial elastic force by setting the model and elastic stroke of the elastic member, so that the elastic force on the undercut is of appropriate size and not easily damaged. Thirdly, the elastic force is applied to the undercut through the buffer patch 2 to further protect the undercut. This prevents the undercut from being detached from the front mold 1 and the rear mold at one time, causing the undercut to be deformed, thereby improving the yield rate of the undercut product.

[0033] By optimizing the frictional force, a groove of suitable length is provided on the guide rod 3, and a part of the elastic member 4, i.e., the tail end, is arranged in the groove, so that the contact area between the guide rod 3 and the elastic member 4 is reduced as much as possible, and the friction loss of the elastic member 4 during operation can be minimized. Reducing the frictional force can not only improve the movement efficiency of the elastic member 4. Frictional force is one of the main reasons for the surface wear of the elastic member 4. By reducing the frictional force, the surface wear of the elastic member 4 can be reduced, its service life can be extended, and the cost of maintenance and replacement can be reduced.

[0034] The elastic member 4 is placed in the inner cavity of the guide rod 3 so that the elastic member 4 can move along the guide rod 3 in the guide rod 3, so that the movement trajectory of the elastic member 4 is limited in the inner cavity of the guide rod 3, thereby preventing the elastic member 4 from deviating from the track or rubbing against the front mold 1, thereby preventing the elastic member 4 from malfunctioning and causing demolding to be forced to be interrupted.

[0035] When the mold is opened and forced to be demolded, the undercut moves in the direction away from the front mold when subjected to the pulling force of the rear mold. At this time, the buffer patch 2 gives the undercut an elastic thrust away from the front mold. The elastic thrust is provided by the elastic member 4 and the spring 5. The elastic thrust is enhanced, thereby making the demolding of the undercut relative to the front mold smoother.

[0036] The guide rod 3 is arranged in the protective block 7, so that the guide rod 3 and the protective block 7 become a whole, and the protective block 7 is embedded in the inner cavity of the front mold 1. The protective block 7 is determined according to the size of the guide rod 3. There are many parts in the front mold 1. The protective block 7 is added outside the guide rod 3. On the one hand, it reduces the difficulty of designing and producing the mold. It is only necessary to design a rectangular parallelepiped that meets the size of the guide rod 3. The front mold 1 only needs to reserve the corresponding size, and there is no need to cooperate with the design of the space size that fits the shape of the guide rod 3, which reduces the difficulty of mold design and processing; on the other hand, it avoids friction loss between the guide rod 3 and other parts inside the front mold 1.

[0037] like Figure 3 As shown, the guide rod 3 is clamped with the step surface of the protection block 7 through the step surface, which can make the connection between the guide rod 3 and the protection block 7 more stable, ensure that the guide rod 3 is stable without shaking, and ensure the normal operation of the device.

[0038] The undercut is made of plastic and is shaped after plastic cooling of the mold. However, in order to ensure work efficiency, it is not possible to wait for the undercut mold to be completely cooled before opening the mold. The undercut is demoulded after reaching the mold opening temperature. Since the undercut is made of plastic, the structure of the plastic that has not been completely cooled is relatively unstable and is prone to deformation and adhesion to the buffer patch 2. The auxiliary sliding plate is added to the part in contact with the undercut to avoid the undercut from adhering to the buffer patch 2 and being difficult to disengage, thereby causing the deformation of the undercut.

[0039] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An automobile undercut demoulding device, comprising a front mold (1), characterized in that: It also comprises a guide rod (3) arranged in the inner cavity of the front mold (1) and an elastic member (4) connected to the guide rod (3); one end of the elastic member is connected to the guide rod (3) and the other end is connected to a buffer patch (2); the buffer patch (2) is used to abut against the undercut.

2. The automobile undercut demoulding device according to claim 1, characterized in that: An accommodating groove is provided on the outer surface of the guide rod (3), and a portion of the elastic member (4) is arranged in the accommodating groove.

3. The automobile undercut demoulding device according to claim 2, characterized in that: The guide rod (3) is provided with a hollow cavity, and the elastic member (4) is arranged in the hollow cavity of the guide rod (3).

4. The automobile undercut demoulding device according to claim 2, characterized in that: It also comprises a spring (5), one end of the spring (5) being connected to the elastic member (4), and the other end of the spring (5) being connected to a side of the guide rod (3) away from the buffer patch (2).

5. The automobile undercut demoulding device according to claim 1, characterized in that: A protection block (7) is provided in the inner cavity of the front mold (1), and the guide rod (3) is arranged in the protection block (7).

6. The automobile undercut demoulding device according to claim 5, characterized in that: One end of the guide rod (3) away from the buffer patch (2) is provided with a step surface which is engaged with the step surface of the protection block (7).

7. The automobile undercut demoulding device according to claim 6, characterized in that: The buffer patch (2) is provided with an auxiliary sliding plate on one side thereof that is in contact with the undercut.

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