Split type movable mold core structure of BMC injection mold

Abstract

The utility model discloses a split type movable mold core structure of a BMC (bulk molding compound) injection mold, which comprises a movable mold core head and a movable mold core bottom, the movable mold core bottom is connected with the movable mold core head in an inserting manner, the hardness of the movable mold core bottom is smaller than that of a fixed mold core, the movable mold core bottom is also provided with a fixed part, and the fixed part is connected with the movable mold core head. The bottom of the movable mold core is further connected with the head of the movable mold core in a fastened mode through a fixing piece. The whole movable mold core is divided into the movable mold core head and the movable mold core bottom, the movable mold core head and the movable mold core bottom are fixed together, the hardness of the movable mold core head is consistent with that of the fixed mold core, and the hardness of the movable mold core bottom is smaller than that of the fixed mold core. The head of the movable mold core and the bottom of the movable mold core are connected and fastened through the bolt, so that when the bottom of the movable mold core collides with the edge of the fixed mold core, damage to the edge of the fixed mold core is reduced, and the product quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to a split movable mold core structure for BMC injection molds. Background Technology

[0002] Currently, to achieve a cavity-free process, BMC injection molds for DC motors employ a movable core structure. The movable core is press-fitted into the stator core on a hydraulic press using a pressing fixture, and then placed into the fixed core of the mold. The mold has an eight-cavity design and is used for 200 loading and unloading operations per day. The drawback is that the movable core collidees with the fixed core and the mold cavity surfaces. This collision during loading and unloading damages the fixed core, resulting in flash on the stator after injection molding, and a series of product quality problems caused by mold damage.

[0003] The existing integral movable mold core has a heat treatment hardness of HRC52-55, which is the same as that of the fixed core. During normal injection molding production, the edge of the fixed core will be bumped, resulting in flash in the inner cavity. Utility Model Content

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of this utility model is to provide a split movable mold core structure for BMC injection molds. The upper part of the movable mold core has high hardness and the lower part has low hardness, which solves the problem of the movable mold core damaging the cavity surface of the injection mold, improves the service life of the mold, reduces the mold maintenance cost, and improves product quality.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a split movable mold core structure for BMC injection mold, including a movable mold core head and a movable mold core bottom. The movable mold core bottom is connected to the movable mold core head by an insertion method. The hardness of the movable mold core bottom is less than that of the fixed core. The movable mold core bottom is also provided with a fixing member. The movable mold core bottom is also fastened to the movable mold core head through the fixing member.

[0006] As a further improvement of this utility model: the bottom of the movable mold core is provided with a base and a plug-in part, one end of the plug-in part is fixedly connected to the base, and the other end of the plug-in part is plugged into the lower end of the head of the movable mold core.

[0007] As a further improvement of this utility model: the plug-in part includes a column, the column is fixedly connected to the base, and the plug-in part is fixedly inserted into the bottom end of the movable mold core head through the column.

[0008] As a further improvement of this utility model: the bottom end of the movable mold core head is provided with an insertion cavity, and an abutment block is provided in the insertion cavity. The abutment block is fixedly connected to the movable mold core head in the insertion cavity.

[0009] As a further improvement of this utility model: the column is also provided with an abutment groove, and the column is inserted into the insertion cavity and fixed by the abutment block and the abutment groove.

[0010] As a further improvement of this utility model: both the column and the base are provided with through holes in the middle, and the movable mold core head is also provided with locking holes in the insertion cavity.

[0011] As a further improvement of this utility model: one end of the fixing member passes through the through hole, passes through the column, and is locked in the locking hole with the base.

[0012] As a further improvement of this utility model: one end of the fixing member is provided with a thread, the locking hole is a threaded hole, and one end of the fixing member passes through the through hole, passes through the column, and is locked in the locking hole with the base by thread engagement.

[0013] As a further improvement of this utility model: the movable mold core head and the fixed core are made of SKD61 material, and the heat treatment hardness is HRC52-55.

[0014] As a further improvement of this utility model: the bottom of the movable mold core is made of SKD61 material.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This utility model divides the overall movable mold core into two parts: a movable mold core head and a movable mold core bottom, and fixes the movable mold core head and the movable mold core bottom together. The movable mold core head and the fixed mold core have the same hardness, while the hardness of the movable mold core bottom is less than that of the fixed mold core. By connecting and securing the movable mold core head and the movable mold core bottom together, the damage to the edge of the fixed mold core is reduced when the bottom of the movable mold core collides with the edge of the fixed mold core, thereby improving product quality.

[0017] 2. The movable mold core is connected in two separate parts: the movable mold core head and the movable mold core bottom. During use, any bumps or knocks on the bottom of the movable mold core will be assessed. If it is determined that the bottom of the movable mold core is unusable, only the bottom part of the movable mold core needs to be replaced, while the movable mold core head can be retained for continued use, reducing mold maintenance costs.

[0018] 3. Secure the head and bottom of the movable mold core with bolts to ensure they do not come loose during use. This will reduce damage to the edge of the fixed core when the bottom of the movable mold core bumps into the edge of the fixed core. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the exploded structure of this utility model;

[0021] Figure 3 This is a perspective view of the structure of this utility model.

[0022] Reference numerals: 1. Movable mold core head, 2. Movable mold core bottom, 21. Base, 22. Column, 23. Abutment groove, 3. Fixed core, 4. Fixing component. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] Currently, to achieve a cavity-cleaning-free process, BMC injection molds for DC motors employ a movable core structure. The movable core is press-fitted into the stator core on a hydraulic press using a pressing fixture, and then placed inside the fixed core 3 of the mold. The mold has an eight-cavity structure and is used 200 times per day. However, this design suffers from the drawback of the movable core colliding with the fixed core 3 on the mold cavity surface, leading to a series of product quality problems due to mold damage.

[0025] Specifically, the fixed core 3 is installed in the cavity plate of the BMC injection mold. The mold structure is an eight-cavity mold with a total of 38 fixed cores. During production, the stator core is pressed into the mold core by a hydraulic press, and the movable mold core is placed into the fixed core 3. The integral movable mold core is made of SKD61, and the heat treatment hardness of the movable mold core and the tail is HRC52-55. The fixed core 3 is made of the same material as the movable mold core, SKD61, and the heat treatment hardness is HRC52-55. During normal injection molding production, the edge of the fixed core 3 will be bumped, resulting in flash in the inner cavity.

[0026] In order to solve the technical problems in the prior art, the present invention will be further described in conjunction with the accompanying drawings and embodiments:

[0027] like Figures 1 to 3As shown in the figure, this utility model embodiment discloses a split movable mold core structure for BMC injection mold, including a movable mold core head 1 and a movable mold core bottom 2. The movable mold core bottom 2 is connected to the movable mold core head 1 by an insertion method. The hardness of the movable mold core bottom 2 is less than that of the fixed core 3. The movable mold core bottom 2 is also provided with a fixing member 4. The movable mold core bottom 2 is also fastened to the movable mold core head 1 through the fixing member 4.

[0028] According to the BMC injection mold split movable core structure of this application, the overall movable core is mainly divided into two parts: a movable core head 1 and a movable core bottom 2. The movable core head 1 and the movable core bottom 2 are fixed together. The movable core head 1 and the fixed core 3 have the same hardness, while the movable core bottom 2 has a lower hardness than the fixed core 3. By tightly connecting the movable core head 1 and the movable core bottom 2, damage to the edge of the fixed core 3 is reduced when the movable core bottom 2 collidees with the edge of the fixed core 3, thus improving product quality. Furthermore, the impact on the movable core bottom 2 during use will be assessed. If it is determined that the movable core bottom 2 is unusable, only the movable core bottom 2 component needs to be replaced, while the movable core head 1 can be retained for continued use.

[0029] In one embodiment of this application, the bottom 2 of the movable mold core is provided with a base 21 and a connector. One end of the connector is fixedly connected to the base 21, and the other end of the connector is inserted into the lower end of the head 1 of the movable mold core. In this embodiment, the bottom 2 of the movable mold core encompasses both the base 21 and the connector. The main purpose of this arrangement is to further separate the bottom 2 of the movable mold core. During use, any bumps or knocks to the base 21 will be assessed. If it is determined that the base 21 is unusable, only the base 21 component needs to be replaced, while the head 1 and the connector of the bottom 2 of the movable mold core can be retained for continued use.

[0030] Furthermore, the insertion part includes a column 22, which is fixedly connected to the base 21. The insertion part is inserted into and fixedly fixed to the bottom end of the movable mold core head 1 via the column 22. By firmly connecting the movable mold core head 1 to the column 22, damage to the edge of the fixed mold core 3 is reduced when the base 21 connected to the column 22 collidees with the edge of the fixed mold core 3, thus improving product quality.

[0031] In one embodiment of this application, the bottom end of the movable mold core head 1 is provided with an insertion cavity, and an abutment block is provided in the insertion cavity. The abutment block is fixedly connected to the movable mold core head 1 in the insertion cavity. Further, the column 22 is also provided with an abutment groove 23, and the column 22 is inserted into the insertion cavity and fixed by the abutment block and the abutment groove 23. In this embodiment, after the column 22 is inserted into the bottom end of the movable mold core head 1, since the column 22 is fixed by the fixing member 4, to prevent the column 22 from following the movement, the abutment block and the abutment groove 23 are used to prevent the column 22 from moving, which can better fix the column 22 in the insertion cavity.

[0032] In one embodiment of this application, both the column 22 and the base 21 have through holes in their middle portions, and the movable mold core head 1 also has a locking hole in its insertion cavity. Further, one end of the fixing member 4 passes through the through hole and is locked to the column 22 and base 21 in the locking hole. Even further, one end of the fixing member 4 is threaded, and the locking hole is a threaded hole; the one end of the fixing member 4 passes through the through hole and is locked to the column 22 and base 21 in a threaded engagement. In this application, the entire movable mold core is divided into two parts: a movable mold core head 1 and a movable mold core bottom 2. When the movable mold core head 1 and the movable mold core bottom 2 are fixed together, the column 22 and the base 21 are bolted to the insertion cavity at the bottom of the movable mold core head 1. This reduces damage to the edge of the fixed mold core 3 when the base 21 of the movable mold core bottom 2 collides with the edge of the fixed mold core 3, thus improving product quality. Furthermore, the impact caused to the base 21 during use will be assessed. If it is determined that the base 21 is unusable, only the base 21 component needs to be replaced. The insertion parts of the movable mold core head 1 and the movable mold core bottom 2 can be retained for continued use.

[0033] In one embodiment of this application, the movable mold core head 1 and the fixed mold core 3 are made of SKD61 material with a heat treatment hardness of HRC52-55. Further, the movable mold core bottom 2 is also made of SKD61 material.

[0034] Through structural innovation, the movable mold core is modified into a split structure. The upper part of the movable mold core has high hardness, while the lower part has low hardness. The head 1 of the movable mold core is made separately, made of SKD61 material, and heat-treated to a hardness of HRC52-55. The bottom 2 of the movable mold core is then made, made of SKD61 material, without heat treatment, and with a hardness of about HRC25. The movable mold core is embedded in the mold core to prevent the bottom 2 of the movable mold core from damaging the mold during handling. The newly made head 1 of the movable mold core and the bottom 2 of the movable mold core are connected and fastened with bolts to ensure that they will not fall off during use. This reduces the damage to the edge of the fixed core 3 when the bottom 2 of the movable mold core 3 bumps into it.

[0035] This utility model discloses a split movable mold core structure for BMC injection molds. The upper part of the movable mold core has high hardness, while the lower part has low hardness. This solves the problem of the movable mold core damaging the cavity surface of the injection mold, improves the service life of the mold, reduces the mold maintenance cost, and effectively improves product quality.

[0036] In summary, any other corresponding modifications made by those skilled in the art after reading this utility model document, based on the technical solution and concept of this utility model without creative mental effort, shall all fall within the scope of protection of this utility model.

Claims

1. A split-type movable mold core structure for BMC injection molds, characterized in that, It includes a movable mold core head and a movable mold core bottom. The movable mold core bottom is connected to the movable mold core head by an insertion method. The hardness of the movable mold core bottom is less than that of the fixed core. The movable mold core bottom is also provided with a fixing component. The movable mold core bottom is also fastened to the movable mold core head through the fixing component.

2. The BMC injection mold split movable core structure according to claim 1, characterized in that, The bottom of the movable mold core is provided with a base and a plug-in part. One end of the plug-in part is fixedly connected to the base, and the other end of the plug-in part is plugged into the lower end of the head of the movable mold core.

3. The BMC injection mold split movable core structure according to claim 2, characterized in that, The insertion part includes a column, which is fixedly connected to the base, and the insertion part is fixedly inserted into the bottom end of the movable mold core head through the column.

4. The BMC injection mold split movable core structure according to claim 3, characterized in that, The bottom end of the movable mold core head is provided with an insertion cavity, and an abutment block is provided in the insertion cavity. The abutment block is fixedly connected to the movable mold core head in the insertion cavity.

5. The BMC injection mold split movable core structure according to claim 4, characterized in that, The column is also provided with an abutment groove, and the column is inserted into the insertion cavity and fixed by the abutment block and the abutment groove.

6. The BMC injection mold split movable core structure according to claim 5, characterized in that, Both the column and the base have through holes in the middle, and the movable mold core head also has a locking hole in the insertion cavity.

7. The BMC injection mold split movable core structure according to claim 6, characterized in that, One end of the fastener passes through a through hole, passes through the column, and is locked to the base in a locking hole.

8. The BMC injection mold split movable core structure according to claim 7, characterized in that, One end of the fastener is provided with a thread, and the locking hole is a threaded hole. One end of the fastener passes through the through hole, passes through the column, and is locked in the locking hole with the base by thread engagement.

9. The BMC injection mold split movable core structure according to claim 1, characterized in that, The movable mold core head and the fixed mold core are made of SKD61 material, and the heat treatment hardness is HRC52-55.

10. A split movable mold core structure for BMC injection molds according to claim 9, characterized in that, The bottom of the movable mold core is made of SKD61 material.

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