CN115816784B - NMT-based nano injection molding mold - Google Patents
NMT-based nano injection molding mold Download PDFInfo
- Publication number
- CN115816784B CN115816784B CN202310050889.3A CN202310050889A CN115816784B CN 115816784 B CN115816784 B CN 115816784B CN 202310050889 A CN202310050889 A CN 202310050889A CN 115816784 B CN115816784 B CN 115816784B
- Authority
- CN
- China
- Prior art keywords
- lower mold
- heating
- mold core
- core cavity
- wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The invention relates to the technical field of nano injection molding, and provides a nano injection molding mold based on NMT (N-methyl pyrrolidone), which comprises a lower template and a lower mold core, wherein the top surface of the lower template is provided with a lower mold core cavity, and the inner part of the lower mold core cavity is provided with sinking steps along the circumferential direction; the lower mold core comprises a molding part and a heating part from top to bottom in sequence. On the basis of the prior art of heating the lower mold core by hot air, the invention improves the mounting mode of the lower mold core and is matched with the added butt joint component for conducting the air guide hole on the lower template and the heating hole on the heating part of the lower mold core, so that the hot air can directly enter the heating part to heat the lower mold core on the basis of not influencing the normal mounting operation of the lower mold core and being beneficial to replacing the lower mold core with molding cavities of different shapes, thereby avoiding unnecessary heat loss caused by the overflow of the hot air as much as possible, ensuring the high efficiency and stability of the heating process of the lower mold core and further ensuring the good quality of products after nano injection molding.
Description
Technical Field
The invention relates to the technical field of nano injection molding, in particular to a nano injection molding mold based on NMT.
Background
NMT (namely nano injection molding technology) is a molding process which integrates multiple subjects such as materials science, metal surface treatment, mold design and processing, injection molding process and the like, and is also one of the key development directions of polymer/metal composite injection molding technology.
Present nanometer injection moulding mould is usually by the cope match-plate pattern, go up the mold core, parts such as lower bolster and lower mold core constitute, wherein go up the mold core install the bottom surface of cope match-plate pattern and with lower mold core adaptation, the lower mold core is installed in the lower mold core intracavity of lower bolster, a molding cavity for placing metal substrate then sets up under on the mold core, in order to guarantee good mould quality that fills in the actual injection moulding stage, need heat nanometer injection moulding mould to certain temperature usually, conventional heating methods all adopts the mode of nanometer injection moulding mould bulk heating to heat in the past, this kind of mode often heat loss is big, be unfavorable for the quick promotion of molding cavity temperature. Therefore, through retrieval, chinese patent application No. CN2019105116882 discloses a micro-nano injection molding mold cavity heating system and a heating method thereof, wherein a mold insert with holes (i.e. a lower mold core) is heated by introducing hot air with certain pressure and temperature and generating shearing friction heat by high-speed airflow, so that the heating efficiency can be effectively improved and the temperature can be conveniently controlled.
However, the lower mold core is usually installed in the lower mold core cavity of the lower mold plate, so that the sealing problem and the pipeline connection problem when the lower mold core is installed in the lower mold core cavity of the lower mold plate have to be considered, and the above patent documents do not mention the installation mode of the lower mold core.
Disclosure of Invention
The invention aims to provide a NMT-based nano injection molding mold, which can effectively simplify the installation process of a lower mold core by improving the installation mode of the lower mold core on the basis of the existing technology of heating the mold by hot air, and can avoid unnecessary heat loss caused by hot air overflow as much as possible so as to ensure that the heating process of the lower mold core is efficient and stable, thereby ensuring that the product quality after nano injection molding is good.
The purpose of the invention is realized by the following technical scheme:
the invention provides a nanometer injection molding mold based on NMT, which comprises a lower template and a lower mold core, wherein the top surface of the lower template is provided with a lower mold core cavity, and a sinking step is arranged in the lower mold core cavity along the circumferential direction;
the lower mold core sequentially comprises a forming part and a heating part from top to bottom, a forming cavity is formed in the top surface of the forming part, the bottom surface of the forming part is borne on the top surface of the sinking step, a plurality of heating holes are formed in the heating part, and the plurality of heating holes transversely penetrate through the heating part;
the inner wall of one side of the lower die core cavity is provided with air guide holes in one-to-one correspondence with the heating holes, the air guide holes are aligned with the heating holes, the air guide holes transversely penetrate through the lower die plate, one side, close to the lower die core cavity, in the air guide holes is provided with a butt joint assembly, and the inner wall of the other side of the lower die core cavity is provided with an air outlet aligned with the heating holes;
the butt joint assembly is used for leading the air guide hole to be directly communicated with the heating hole when hot air with certain pressure and temperature is led into the air guide hole.
In some possible embodiments, the docking assembly includes a fixed sleeve, a movable sleeve, a sliding ring and an elastic element, the fixed sleeve is disposed in the air guide hole and close to the lower die core cavity, both ends of the fixed sleeve are provided with limit rings, the inner diameter of each limit ring is matched with the outer diameter of the movable sleeve, the sliding ring is sleeved on the outer wall of the movable sleeve and located on one side far away from the lower die core cavity, and the movable sleeve is slidably disposed in the fixed sleeve through the sliding ring;
the elastic piece is sleeved on the outer wall of the movable sleeve, one end of the elastic piece is connected with the slip ring, and the other end of the elastic piece is connected with the limiting ring on one side of the fixed sleeve, which is close to the lower die core cavity;
the end of the movable sleeve far away from the lower die core cavity is an open end, the end of the movable sleeve close to the lower die core cavity is a closed end, the closed end of the movable sleeve is provided with an air outlet, the outer diameter of the movable sleeve is matched with the inner diameter of the heating hole, and the inner diameter of the air outlet is smaller than the inner diameter of the movable sleeve.
In some possible embodiments, the circumferential outer wall of the heating portion is in contact fit with the circumferential inner wall of the lower die core cavity, and the bottom surface of the heating portion is in contact fit with the bottom surface of the lower die core cavity.
In some possible embodiments, a liquid storage tank is arranged on the circumferential outer wall of the heating part, the liquid storage tank is positioned above the heating hole, the liquid storage tank extends along the circumferential direction of the heating part and then is closed, a flexible sealing layer is arranged in the liquid storage tank, the flexible sealing layer extends along the circumferential direction of the liquid storage tank and then is closed, a sealing cavity is formed between the flexible sealing layer and the liquid storage tank, and low-boiling-point evaporation liquid is filled in the sealing cavity;
the inner wall of the lower die core cavity is provided with a sealing groove aligned with the liquid storage tank, and the sealing groove is closed after extending along the circumferential direction of the lower die core cavity.
In some possible embodiments, the inner wall of one side of the air guide hole close to the lower die core cavity is provided with an internal thread, and the outer wall of the fixing sleeve is provided with an external thread matched with the internal thread.
In some possible embodiments, a plurality of fixing columns are arranged on the top surface of the sinking step along the circumferential direction of the sinking step, fixing holes corresponding to the fixing columns in a one-to-one manner are formed in the top surface of the forming portion, the fixing holes longitudinally penetrate through the forming portion, and the fixing columns are connected with nuts after penetrating through the fixing holes.
In some possible embodiments, the top surface of the forming portion at the fixing hole is a concave structure, and the top surface of the fixing column is not higher than the top surface of the forming portion.
In some possible embodiments, the molding portion is provided with a lower groove on two opposite sides of the top surface, and the lower groove is provided with a portable column which is integrally molded with the molding portion.
In some possible embodiments, the outer wall of the lower template is provided with a gas homogenizing box corresponding to the gas guide hole, the gas homogenizing box is communicated with the gas guide hole, and one side of the gas homogenizing box, which is far away from the lower template, is provided with a gas inlet joint.
In some possible embodiments, the air outlet is in a strip-shaped structure, and an air outlet joint is arranged on the outer wall of the lower template corresponding to the air outlet and is communicated with the air outlet.
The technical scheme of the embodiment of the invention at least has the following advantages and beneficial effects:
1. on the basis of the prior art of heating the lower mold core by hot air, the invention improves the mounting mode of the lower mold core and is matched with the added butt joint component for conducting the air guide hole on the lower template and the heating hole on the heating part of the lower mold core, so that the hot air can directly enter the heating part to heat the lower mold core on the basis of not influencing the normal mounting operation of the lower mold core and being beneficial to replacing the lower mold core with molding cavities of different shapes, thereby avoiding unnecessary heat loss caused by the overflow of the hot air as much as possible, ensuring the high efficiency and stability of the heating process of the lower mold core and further ensuring the good quality of products after nano injection molding.
2. According to the invention, by further adding the sealing component, on the basis of effectively improving the sealing performance between the heating part and the lower mold core cavity and avoiding unnecessary heat loss caused by hot air overflow, the flexible sealing layer can expand and deform only in the heating stage to play a sealing role, so that the normal installation operation of the lower mold core is not influenced, and the practicability of the nano injection molding mold in actual use is further improved.
Drawings
Fig. 1 is a schematic structural diagram of a nano injection molding mold according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a lower template according to an embodiment of the present invention;
fig. 3 is a schematic structural view of the lower template provided in the embodiment of the present invention from another view angle;
FIG. 4 is a schematic structural diagram of a lower mold core according to an embodiment of the present invention;
FIG. 5 is a cross-sectional view of a nano injection molding die provided in an embodiment of the present invention;
FIG. 6 is an enlarged view taken at A in FIG. 5;
FIG. 7 is a schematic view of the movable sleeve of FIG. 6 extending into the corresponding heating hole;
FIG. 8 is a schematic structural diagram of a movable sleeve and a slip ring thereof according to an embodiment of the present invention;
FIG. 9 is an enlarged view at B in FIG. 5;
fig. 10 is a schematic view of the structure of fig. 9 after expansion and deformation of the flexible seal layer.
Icon: 10-a lower template, 10 a-a lower mold core cavity, 10 b-a sunken step, 10 c-an air guide hole, 10 d-an air outlet, 10 e-a sealing groove, 20-a lower mold core, 21-a forming part, 21 a-a forming cavity, 21 b-a fixing hole, 21 c-a lower groove, 21 d-a handheld column, 22-a heating part, 22 a-a heating hole, 22 b-a liquid storage tank, 22 c-a flexible sealing layer, 30-a fixing column, 40-a nut, 50-a butt joint component, 51-a fixing sleeve, 52-a movable sleeve, 52 a-an air outlet, 53-a sliding ring, 54-an elastic part, 55-a limiting ring, 60-an air equalizing box, 70-an air inlet joint and 80-an air outlet joint.
Detailed Description
Example 1
Referring to fig. 1 to 8, the present embodiment provides a NMT-based nano injection mold, which includes an upper template, an upper mold core, a lower template 10, a lower mold core 20, and other components, wherein the upper template (not shown in the figure) is adapted to the lower template 10, the upper mold core (not shown in the figure) is disposed in an upper mold core cavity at the bottom surface of the upper template and adapted to the lower mold core 20, after the upper template and the lower template 10 are closed, a nano injection molding operation on a corresponding metal substrate can be performed through cooperation of the upper mold core and the lower mold core 20, and based on the present embodiment, structures of the upper template and the upper mold core are not improved, so that the structures of the upper template and the upper mold core can refer to an existing nano injection mold.
In the present embodiment, as shown in fig. 2 or fig. 3, a lower mold core cavity 10a for accommodating the lower mold core 20 is opened at the top surface of the lower mold plate 10, and at this time, a sunken step 10b is provided in the lower mold core cavity 10a along the circumferential direction thereof. That is, the lower core cavity 10a is divided into an upper chamber and a lower chamber in sequence from top to bottom to accommodate different portions of the lower core 20 through the upper chamber and the lower chamber, respectively.
Specifically, as shown in fig. 4, the lower mold core 20 includes a forming portion 21 and a heating portion 22 in sequence from top to bottom, a forming cavity 21a for accommodating the metal substrate is opened on a top surface of the forming portion 21, and in general, the forming cavity 21a is adapted to a shape of the metal substrate to be subjected to nano injection molding, so as to improve stability when the metal substrate is placed in the forming cavity 21a and subjected to nano injection molding. Meanwhile, as shown in fig. 5, when the lower mold core 20 is placed in the lower mold core cavity 10a, the bottom surface of the molding portion 21 is supported on the top surface of the sinking step 10b, the bottom surface of the heating portion 22 contacts and fits the bottom surface of the lower mold core cavity 10a, and the circumferential outer wall of the heating portion 22 contacts and fits the circumferential inner wall of the lower mold core cavity 10 a. That is, at this time, the molding part 21 of the lower core 20 is located in the upper chamber of the lower core chamber 10a, and the heating part 22 of the lower core 20 is located in the lower chamber of the lower core chamber 10 a.
Meanwhile, in order to achieve reliable fixation between the lower mold core 20 and the lower mold plate 10, the top surface of the sinking step 10b is provided with a plurality of fixing posts 30 along the circumferential direction thereof, for example, in combination with the content shown in fig. 1, fig. 2 or fig. 3, the number of the fixing posts 30 provided on the sinking step 10b is eight, and the fixing posts 30 are distributed at four corners of the sinking step 10b in a group of two. Correspondingly, with reference to the content shown in fig. 4, the top surface of the forming portion 21 is provided with fixing holes 21b corresponding to the fixing posts 30 one by one, the fixing holes 21b longitudinally penetrate through the forming portion 21, and the fixing posts 30 are connected with nuts 40 after penetrating through the fixing holes 21b, it can be understood that the fixing posts 30 may be, but are not limited to, screws with external threads on the outer walls.
That is, when the lower mold core 20 is installed, the fixing holes 21b of the forming portion 21 are aligned with the corresponding fixing posts 30, then the lower mold core 20 is directly placed into the lower mold core cavity 10a, the fixing posts 30 pass through the corresponding fixing holes 21b, after the bottom surface of the forming portion 21 is supported on the top surface of the sinking step 10b, the nuts 40 are screwed on the top of the fixing posts 30, and the lower mold core 20 and the lower mold plate 10 can be reliably fixed, and the operation is simple and convenient.
Considering that after the upper mold plate and the lower mold plate 10 are assembled, the bottom surface of the corresponding upper mold core often needs to contact and attach to the top surface of the lower mold core 20 (that is, the top surface of the molding portion 21), for this reason, with reference to fig. 1 or fig. 4, the top surface of the molding portion 21 located at the fixing hole 21b is a concave structure, and the top surface of the fixing post 30 is not higher than the top surface of the molding portion 21, that is, the top surfaces of the fixing post 30 and the molding portion 21 are located in the same horizontal plane or the top surface of the fixing post 30 is lower than the top surface of the molding portion 21, so that the fixing post 30 and the nut 40 are prevented from generating an interference effect on the upper mold core, so as to ensure that the upper mold plate and the lower mold plate 10 can be assembled normally.
In addition, considering that the lower mold core cavity 10a of the lower mold plate 10 is adapted to the lower mold core 20, when the lower mold core 20 is placed in the lower mold core cavity 10a, the circumferential outer wall of the forming portion 21 contacts and fits with the circumferential inner wall of the upper cavity of the lower mold core cavity 10a, so as to facilitate placing the lower mold core 20 in the lower mold core cavity 10a or taking the lower mold core 20 out of the lower mold core cavity 10a, with continued reference to fig. 1 or fig. 4, the two opposite sides of the top surface of the forming portion 21 are provided with lower grooves 21c, the lower grooves 21c are provided with lifting pillars 21d, the lifting pillars 21d are integrally formed with the forming portion 21 to ensure the structural integrity of the forming portion 21, and similarly, the top surfaces of the lifting pillars 21d and the top surface of the forming portion 21 are in the same horizontal plane, so as to prevent the lifting pillars 21d from affecting the normal mold assembly of the upper mold plate and the lower mold plate 10. With the arrangement, the lower mold core 20 can be pulled by holding the two lifting posts 21d with two hands, so that the lower mold core 20 can be rapidly placed in the lower mold core cavity 10a or taken out of the lower mold core 20 from the lower mold core cavity 10 a.
In this embodiment, in order to heat the lower mold core 20, a plurality of heating holes 22a are formed in the heating portion 22 of the lower mold core 20, and the plurality of heating holes 22a transversely penetrate through the heating portion 22, for example, in combination with the content shown in fig. 4, in this embodiment, there are eleven heating holes 22a, which are uniformly arranged in a straight line and are all parallel to the bottom surface of the heating portion 22, so that when hot air with a certain pressure and temperature enters the heating holes 22a, the heating portion 22 is heated more uniformly.
Correspondingly, in order to realize the purpose of conveying the hot air generated by the external air supply device into the heating holes 22a of the heating portion 22, in combination with the contents shown in fig. 3 or 5, the inner wall of one side of the lower mold core cavity 10a is provided with the air guide holes 10c corresponding to the heating holes 22a one to one, each air guide hole 10c is aligned with the corresponding heating hole 22a, and the air guide hole 10c transversely penetrates through the lower mold plate 10, at this time, in combination with the contents shown in fig. 2 or 5, one side of the air guide hole 10c close to the lower mold core cavity 10a is provided with the docking assembly 50, correspondingly, in combination with the contents shown in fig. 3 or 5, the inner wall of the other side of the lower mold core cavity 10a is provided with the air outlet 10d aligned with the heating hole 22a, and the docking assembly 50 is used for directly communicating the air guide hole 10c with the corresponding heating hole 22a when the hot air at a certain pressure and temperature is introduced into the air guide hole 10 c.
So set up, in the nanometer injection moulding heating stage, after hot-air got into in the air guide hole 10c of lower bolster 10, to single air guide hole 10c, butt joint subassembly 50 in this air guide hole 10c directly switches on this air guide hole 10c and corresponding heating hole 22a to make hot-air directly get into in heating hole 22a by air guide hole 10c in order to heat lower die core 20, thereby avoid hot-air to flow out from the clearance between heating portion 22 circumference outer wall and the lower die core chamber 10a circumference inner wall as far as possible, cause unnecessary heat loss, and the hot-air that passes heating hole 22a will directly be followed air outlet 10d and is located to discharge.
It should be noted that, in practical implementation, a heat insulation layer (not shown) may be disposed on an inner wall of each air guide hole 10c to prevent the hot air entering the air guide hole 10c from transferring heat to the lower mold plate 10 as much as possible, thereby further avoiding unnecessary heat loss.
In order to achieve direct conduction between the air guide hole 10c and the corresponding heating hole 22a through the docking assembly 50 when hot air enters the air guide hole 10c, specifically, with reference to the contents shown in fig. 6 or fig. 7, the docking assembly 50 includes a fixed sleeve 51, a movable sleeve 52, a sliding ring 53 and an elastic member 54, the fixed sleeve 51 is disposed in the air guide hole 10c and is close to the lower mold core cavity 10a, it can be understood that, in order to facilitate installation of the fixed sleeve 51 in the air guide hole 10c, an inner thread is disposed on an inner wall of the air guide hole 10c close to the lower mold core cavity 10a, an outer wall of the fixed sleeve 51 is provided with an external thread adapted to the internal thread, so as to achieve installation of the fixed sleeve 51 in the air guide hole 10c by means of threaded connection, operation is simple and convenient, and replacement of the damaged and failed docking assembly 50 in a later period is facilitated.
Meanwhile, both ends of the fixed sleeve 51 are provided with limiting rings 55, the inner diameter of each limiting ring 55 is matched with the outer diameter of the movable sleeve 52, in combination with the content shown in fig. 8, the sliding ring 53 is sleeved on the outer wall of the movable sleeve 52, the sliding ring 53 is located on one side of the movable sleeve 52 far away from the lower die core cavity 10a, the sliding ring 53 can be limited inside the fixed sleeve 51 through the limiting rings 55 on both sides of the fixed sleeve 51, and the movable sleeve 52 is arranged inside the fixed sleeve 51 through the sliding ring 53 in a sliding manner, namely, the circumferential outer wall of the sliding ring 53 is connected with the circumferential inner wall of the fixed sleeve 51 in a sliding manner, so that the movable sleeve 52 can slide along the axial direction of the fixed sleeve 51 to extend out of the fixed sleeve 51.
With reference to fig. 6 or fig. 7, the elastic element 54 is sleeved on the outer wall of the movable sleeve 52, one end of the elastic element 54 is connected to the sliding ring 53, the other end of the elastic element 54 is connected to the limiting ring 55 on the side of the fixed sleeve 51 close to the lower mold core cavity 10a, the elastic element 54 may be, but is not limited to, a compression spring, and the elastic element 54 is used for prestoring an elastic force for forcing the movable sleeve 52 to return when the movable sleeve 52 extends out of the fixed sleeve 51, so that the movable sleeve 52 can return to the inside of the fixed sleeve 51 to be hidden after heating is completed.
Meanwhile, one end of the movable sleeve 52, which is far away from the lower mold core cavity 10a, is an open end, one end of the movable sleeve 52, which is close to the lower mold core cavity 10a, is a closed end, an air outlet hole 52a is formed in the closed end of the movable sleeve 52, the outer diameter of the movable sleeve 52 is matched with the inner diameter of the heating hole 22a, so that the movable sleeve 52 can extend into the corresponding heating hole 22a, and the inner diameter of the air outlet hole 52a is smaller than the inner diameter of the movable sleeve 52, so that the pressure in the movable sleeve 52 can be further increased when hot air enters the movable sleeve 52.
In this arrangement, as shown in fig. 5 and 6, it is assumed that the movable sleeve 52 is completely hidden in the fixed sleeve 51 in the initial state, the elastic element 54 sleeved on the outer wall of the movable sleeve 52 is in a natural extension state, and the outer end surface of the limiting ring 55 on the side of the fixed sleeve 51 close to the lower mold core cavity 10a is in the same vertical plane as the inner wall of the lower mold core cavity 10a, at this time, the lower mold core 20 can be directly installed in the lower mold core cavity 10a, after the lower mold core 20 is installed, the circumferential outer wall of the heating portion 22 contacts and adheres to the circumferential inner wall of the lower mold core cavity 10a, and the air vents 10c are exactly aligned with the corresponding heating holes 22a on the heating portion 22.
In the heating stage of nano injection molding, when the hot air reaches the position of the movable sleeve 52 through the air holes 10c, based on a certain pressure of the hot air, the hot air will directly apply a pushing force to the end surface of the movable sleeve 52 away from the lower mold core cavity 10a, so as to force the movable sleeve 52 to protrude out of the fixed sleeve 51, and for the hot air entering the movable sleeve 52, based on the inner diameter of the air holes 52a opened at the closed end of the movable sleeve 52 being smaller than the inner diameter of the movable sleeve 52, the pressure inside the movable sleeve 52 will also increase rapidly, and the pressure will also force the movable sleeve 52 to protrude out of the fixed sleeve 51, that is, as shown in fig. 7, the movable sleeve 52 will protrude out of the fixed sleeve 51 and into the corresponding heating hole 22a under the combined action of the pushing force applied to the end portion thereof and the internally increased pressure, thereby achieving the purpose of directly conducting the air holes 10c and the corresponding heating hole 22a, so that the hot air can directly enter the heating portion 22 to heat, so as to avoid the elastic force of the elastic gap 54 between the outer wall of the heating portion 22 and the outer wall of the lower mold core cavity 10a circumferential direction to cause an unnecessary heat loss, thereby compressing the elastic element 52.
On the contrary, when the heating is completed, since the hot air is not introduced into the air guide hole 10c, the force acting on the movable sleeve 52 will also disappear, and the elastic member 54 will release the pre-stored elastic force to force the movable sleeve 52 to move back into the fixed sleeve 51 again, so as to reset the movable sleeve 52.
It should be noted that, the above-mentioned docking assembly 50 is adopted to conduct the air vents 10c and the corresponding heating holes 22a, except that hot air can directly enter the heating holes 22a of the heating portion 22 through the air vents 10c to heat the lower mold core 20, because the movable sleeve 52 is always hidden in the fixed sleeve 51 when hot air is not introduced into the air vents 10c, the installation operation of the lower mold core 20 is not affected, which is beneficial to taking out the lower mold core 20 from the lower mold core cavity 10a or replacing the lower mold core 20 with the molding cavities 21a of different shapes, meanwhile, in the heating stage, because part of the movable sleeve 52 extends into the heating holes 22a, a certain limit effect can be achieved through the movable sleeve 52, and the stability of the lower mold core 20 in the nano injection molding heating stage is further improved.
On the other hand, with reference to the content shown in fig. 1 or fig. 5, in this embodiment, an air equalizing box 60 corresponding to the air vents 10c is disposed on the outer wall of the lower mold plate 10, one side of the air equalizing box 60 close to the lower mold plate 10 is in an open structure and is communicated with the air vents 10c, an air inlet joint 70 is disposed on one side of the air equalizing box 60 away from the lower mold plate 10, and the air inlet joint 70 can be directly connected with an external air supply device through a pipeline, and hot air can enter each air vent 10c as uniformly as possible after entering the air equalizing box 60 through the air inlet joint 70, so that the amount of the hot air entering each air vent 10c is more uniform.
Meanwhile, in order to smoothly discharge the hot air flowing through the heating holes 22a of the heating portion 22 in the lower mold plate 10, referring to fig. 3 or 5, the air outlet 10d formed in the inner wall of the lower mold core cavity 10a is in a strip shape, the air outlet 10d extends along the arrangement direction of the heating holes 22a, so that the hot air flowing through all the heating holes 22a can be finally converged at the air outlet 10d, at this time, an air outlet joint 80 is further disposed on the outer wall of the lower mold plate 10 corresponding to the air outlet 10d, the air outlet joint 80 is communicated with the air outlet 10d, so that the hot air converged at the air outlet 10d can be conveyed out through the air outlet joint 80, and the air outlet joint 80 can be directly communicated with an external processing device (e.g., a cooler) through a pipeline, so as to further process the hot air.
Therefore, in the embodiment, on the basis of the existing technology of heating the lower mold core 20 by using hot air, the installation mode of the lower mold core 20 is improved, and the docking assembly 50 which is additionally arranged and used for conducting the air guide holes 10c on the lower mold plate 10 and the heating holes 22a on the heating part 22 of the lower mold core 20 is matched, so that on the basis of not influencing the normal installation operation of the lower mold core 20 and being beneficial to replacing the lower mold core 20 with the molding cavities 21a in different shapes, the hot air can directly enter the heating part 22 to heat the lower mold core 20, unnecessary heat loss caused by overflow of the hot air is avoided as much as possible, the heating process of the lower mold core 20 is efficient and stable, and the good quality of a product after nano injection molding is ensured.
Example 2
On the basis of embodiment 1, although embodiment 1 adopts a technical solution of directly conducting the air-guide holes 10c and the corresponding heating holes 22a by disposing the docking assemblies 50 in the air-guide holes 10c, it is inevitable in practical application that some hot air may overflow through the gap between the circumferential outer wall of the heating part 22 and the circumferential inner wall of the lower die core cavity 10a, thereby causing unnecessary heat loss. For this reason, in the present embodiment, a sealing member is further provided between the circumferential outer wall of the heating part 22 and the circumferential inner wall of the lower core cavity 10a to further improve the sealing performance between the heating part 22 and the lower core cavity 10 a.
Specifically, with reference to the content shown in fig. 9 and fig. 10, a reservoir 22b having a substantially semi-annular structure is formed on the outer circumferential wall of the heating portion 22, the reservoir 22b is located above the heating hole 22a, and the reservoir 22b extends along the circumferential direction of the heating portion 22 and then is closed, that is, the reservoir 22b is disposed around the outer circumferential wall of the heating portion 22, at this time, a flexible sealing layer 22c is disposed in the reservoir 22b, the flexible sealing layer 22c extends along the circumferential direction of the reservoir 22b and then is closed, a sealed cavity is formed between the flexible sealing layer 22c and the reservoir 22b, the flexible sealing layer 22c is made of a high-temperature-resistant flexible material and has a certain deformation capability, and a low-boiling-point evaporation liquid, such as ethanol, is filled in the sealed cavity. Correspondingly, with reference to fig. 2, 3 or 9, a sealing groove 10e aligned with the liquid storage tank 22b is formed in an inner wall of the lower die core cavity 10a, and the sealing groove 10e is closed after extending along the circumferential direction of the lower die core cavity 10a, that is, the sealing groove 10e is disposed around the circumferential inner wall of the lower die core cavity 10 a.
With this arrangement, based on the fact that the low-boiling-point evaporation liquid in the sealing cavity is in a liquid state under normal temperature conditions, the outer side wall of the flexible sealing layer 22c and the circumferential outer wall of the heating portion 22 are substantially in the same vertical plane, so that the lower mold core 20 can be mounted in the lower mold core cavity 10 a. After the lower die core 20 is installed, the flexible sealing layer 22c on the heating portion 22 is exactly aligned with the sealing groove 10e in the lower die core cavity 10a, in the heating stage of nano injection molding, the temperature of the heating portion 22 will rise rapidly under the action of hot air, when the temperature of the heating portion 22 reaches the boiling point of the low-boiling-point evaporating liquid, the low-boiling-point evaporating liquid in the liquid storage tank 22b will evaporate rapidly and change from liquid state to gas state, in the process, the flexible sealing layer 22c will expand and deform, at this time, part of the expanded flexible sealing layer 22c will enter the sealing groove 10e on the inner wall of the lower die core cavity 10a, and then the gap between the circumferential outer wall of the heating portion 22 and the circumferential inner wall of the lower die core cavity 10a is sealed by using the flexible sealing layer 22c as a sealing member, and unnecessary heat loss caused by hot air overflow is avoided as much as possible.
On the contrary, in the cooling stage after the heating is finished, the low-boiling-point evaporation liquid in the sealing cavity is changed from a gas state to a liquid state again along with the decrease of the temperature of the heating part 22, and at this time, the flexible sealing layer 22c is restored to the initial state and withdrawn from the sealing groove 10e under the action of the self-deformation force, so that the lower mold core 20 is taken out from the lower mold core cavity 10 a.
Therefore, in the present embodiment, on the basis of embodiment 1, by further adding a sealing component, on the basis of effectively improving the sealing performance between the heating portion 22 and the lower mold core cavity 10a to avoid unnecessary heat loss caused by hot air overflow, since the flexible sealing layer 22c will expand and deform only in the heating stage to perform the sealing function, the normal installation operation of the lower mold core 20 will not be affected, and the practicability of the nano injection molding mold in actual use is further improved.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A nanometer injection molding mold based on NMT is characterized by comprising a lower template and a lower mold core, wherein the top surface of the lower template is provided with a lower mold core cavity, and a sinking step is arranged in the lower mold core cavity along the circumferential direction;
the lower mold core sequentially comprises a forming part and a heating part from top to bottom, a forming cavity is formed in the top surface of the forming part, the bottom surface of the forming part is borne on the top surface of the sinking step, a plurality of heating holes are formed in the heating part, and the plurality of heating holes transversely penetrate through the heating part;
the inner wall of one side of the lower die core cavity is provided with air guide holes which are in one-to-one correspondence with the heating holes, the air guide holes are aligned with the heating holes, the air guide holes transversely penetrate through the lower die plate, one side, close to the lower die core cavity, in the air guide holes is provided with a butt joint assembly, and the inner wall of the other side of the lower die core cavity is provided with an air outlet aligned with the heating holes;
the butt joint assembly is used for directly communicating the air guide hole with the heating hole when hot air with certain pressure and temperature is introduced into the air guide hole;
the butt joint assembly comprises a fixed sleeve, a movable sleeve, a sliding ring and an elastic piece, the fixed sleeve is arranged in the air guide hole and is close to the lower die core cavity, two ends of the fixed sleeve are respectively provided with a limiting ring, the inner diameter of the limiting ring is matched with the outer diameter of the movable sleeve, the sliding ring is sleeved on the outer wall of the movable sleeve and is positioned on one side far away from the lower die core cavity, and the movable sleeve is arranged in the fixed sleeve in a sliding mode through the sliding ring;
the elastic piece is sleeved on the outer wall of the movable sleeve, one end of the elastic piece is connected with the slip ring, and the other end of the elastic piece is connected with the limiting ring on one side of the fixed sleeve, which is close to the lower die core cavity;
the end of the movable sleeve far away from the lower die core cavity is an open end, the end of the movable sleeve close to the lower die core cavity is a closed end, the closed end of the movable sleeve is provided with an air outlet, the outer diameter of the movable sleeve is matched with the inner diameter of the heating hole, and the inner diameter of the air outlet is smaller than the inner diameter of the movable sleeve.
2. The NMT-based nano injection molding mold according to claim 1, wherein a circumferential outer wall of the heating portion is in contact fit with a circumferential inner wall of the lower core cavity, and a bottom surface of the heating portion is in contact fit with a bottom surface of the lower core cavity.
3. The NMT-based nano injection molding mold according to claim 2, wherein a reservoir is formed in the circumferential outer wall of the heating portion, the reservoir is located above the heating hole, the reservoir is closed after extending in the circumferential direction of the heating portion, a flexible sealing layer is arranged in the reservoir, the flexible sealing layer is closed after extending in the circumferential direction of the reservoir, a sealed cavity is formed between the flexible sealing layer and the reservoir, and low-boiling-point evaporating liquid is filled in the sealed cavity;
the inner wall of the lower die core cavity is provided with a sealing groove aligned with the liquid storage groove, and the sealing groove is closed after extending along the circumferential direction of the lower die core cavity.
4. The NMT-based nano injection molding mold according to claim 1, wherein the inner wall of the air vent on the side close to the lower mold core cavity is provided with an internal thread, and the outer wall of the fixing sleeve is provided with an external thread adapted to the internal thread.
5. The NMT-based nano injection molding mold according to claim 1, wherein a plurality of fixing posts are arranged on the top surface of the sinking step along the circumferential direction, fixing holes corresponding to the fixing posts one by one are formed in the top surface of the molding portion, the fixing holes longitudinally penetrate through the molding portion, and the fixing posts are connected with nuts after penetrating through the fixing holes.
6. The NMT-based nano injection molding mold according to claim 5, wherein the top surface of the molding part at the fixing hole is a concave structure, and the top surface of the fixing post is not higher than the top surface of the molding part.
7. The NMT based nano injection molding mold according to claim 1, wherein the molding portion has lower grooves formed on opposite sides of a top surface thereof, and the lower grooves have hand-held pillars integrally formed with the molding portion.
8. The NMT-based nano injection molding mold according to claim 1, wherein the outer wall of the lower mold plate is provided with a gas homogenizing box corresponding to the gas guide hole, the gas homogenizing box is communicated with the gas guide hole, and a gas inlet joint is arranged on one side of the gas homogenizing box away from the lower mold plate.
9. The NMT-based nano injection molding mold according to claim 1, wherein the air outlet is of a long strip structure, an air outlet joint is arranged on the outer wall of the lower template corresponding to the air outlet, and the air outlet joint is communicated with the air outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310050889.3A CN115816784B (en) | 2023-02-02 | 2023-02-02 | NMT-based nano injection molding mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310050889.3A CN115816784B (en) | 2023-02-02 | 2023-02-02 | NMT-based nano injection molding mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115816784A CN115816784A (en) | 2023-03-21 |
| CN115816784B true CN115816784B (en) | 2023-04-18 |
Family
ID=85520673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310050889.3A Active CN115816784B (en) | 2023-02-02 | 2023-02-02 | NMT-based nano injection molding mold |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115816784B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4797084A (en) * | 1985-11-29 | 1989-01-10 | Nissei Asb Machine Co., Ltd. | Mold device for molding a preform |
| CN102837401A (en) * | 2012-08-03 | 2012-12-26 | 深圳市亿玛斯自动化设备有限公司 | Plastic forming mould having functional module |
| CN111823516A (en) * | 2020-07-22 | 2020-10-27 | 宁波翔荣精密模具有限公司 | Forming die for balance ring |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3954346B2 (en) * | 2001-10-15 | 2007-08-08 | 株式会社山武 | Injection molding apparatus and injection molding method |
| KR20050003110A (en) * | 2003-06-30 | 2005-01-10 | 주식회사 대우일렉트로닉스 | Core cool structure of injection molding |
| JP2007283495A (en) * | 2006-04-12 | 2007-11-01 | Kanto Itami Denki Kk | Mold and resin product molding method |
| CN101811338B (en) * | 2009-10-22 | 2012-02-22 | 杨东佐 | Mould capable of realizing rapid heat cycle |
| CN201511506U (en) * | 2009-10-22 | 2010-06-23 | 杨东佐 | Mould capable of realizing quick and uniform heating and cooling |
| CN103909627A (en) * | 2014-04-09 | 2014-07-09 | 常州轻工职业技术学院 | Injection molding mould capable of being fully-automatically de-molded |
| CN104760230A (en) * | 2015-04-15 | 2015-07-08 | 京东方光科技有限公司 | Injection mould |
| CN105108977B (en) * | 2015-09-29 | 2018-03-23 | 京东方光科技有限公司 | The preparation facilities of injection mold and light guide plate |
| CN207359565U (en) * | 2017-07-11 | 2018-05-15 | 福建省石狮市通达电器有限公司 | A kind of nanometer injection mold heating unit and its nanometer injection mold |
| US20190091909A1 (en) * | 2017-09-26 | 2019-03-28 | Brandon Fontaine | Injection Molding Assembly with Cooling Insert |
| CN210389976U (en) * | 2019-06-14 | 2020-04-24 | 深圳市荣文塑胶制品有限公司 | Injection mold with air bag |
| CN211165117U (en) * | 2019-08-12 | 2020-08-04 | 深圳市惠程信息科技股份有限公司 | Die set |
| CN211334336U (en) * | 2019-10-08 | 2020-08-25 | 广州市优信模具有限公司 | Replaceable die |
| CN210679588U (en) * | 2019-10-14 | 2020-06-05 | 苏州昌利橡塑科技有限公司 | Panel computer light guide plate plastic mold |
| CN211763130U (en) * | 2019-12-30 | 2020-10-27 | 宝鸡烽火工模具技术有限公司 | Injection mould assembly |
| CN113119424A (en) * | 2021-04-17 | 2021-07-16 | 成都广艺云智能装备科技有限公司 | Low-loss injection mold |
| CN113306095A (en) * | 2021-04-28 | 2021-08-27 | 嵊州市索奥汽车零部件有限公司 | Preparation process of main shell of camping lamp |
| CN113771302A (en) * | 2021-10-22 | 2021-12-10 | 大智农牧科技集团有限公司 | Novel deodorization net filter screen mould structure |
| CN114603790B (en) * | 2022-04-06 | 2023-10-31 | 佛山市顺德区天玛仕电子有限公司 | Injection mold for automobile parts |
-
2023
- 2023-02-02 CN CN202310050889.3A patent/CN115816784B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4797084A (en) * | 1985-11-29 | 1989-01-10 | Nissei Asb Machine Co., Ltd. | Mold device for molding a preform |
| CN102837401A (en) * | 2012-08-03 | 2012-12-26 | 深圳市亿玛斯自动化设备有限公司 | Plastic forming mould having functional module |
| CN111823516A (en) * | 2020-07-22 | 2020-10-27 | 宁波翔荣精密模具有限公司 | Forming die for balance ring |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115816784A (en) | 2023-03-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1190307C (en) | Improved hot runner sealing apparatus and method | |
| CN115816784B (en) | NMT-based nano injection molding mold | |
| CN206277623U (en) | Plastic mould device | |
| US3287486A (en) | Molding apparatus and method employing thermal expansion and contraction | |
| US8033808B2 (en) | Pressure compensating molding system | |
| CN111421501A (en) | Goat friction connector dismouting frock | |
| CN207630564U (en) | Autoclave and aircraft production equipment | |
| CN215320322U (en) | Injection molding device | |
| KR200468613Y1 (en) | forming dies of waste extruder with heater draw out hole | |
| CN203919513U (en) | Thermoplastic fluoroelastomer plastic liner shaped device | |
| CN216031892U (en) | Die capable of reinforcing bolt positioning | |
| KR20170124094A (en) | Methods and systems for curing materials within cavities | |
| CN208375769U (en) | A kind of large size servo-drive injection molding machine | |
| US5607702A (en) | Segment with heating and cooling device and mold using the segments | |
| CN110901105A (en) | RTM (resin transfer molding) mold structure capable of being heated or cooled rapidly and using method thereof | |
| CN201119191Y (en) | Electric car controller | |
| CN220146667U (en) | Thermal treatment equipment based on high flatness of plastic product | |
| CN115180199B (en) | Material transfer device for small-batch moisture fast-curing type heat-conducting adhesive | |
| CN2170199Y (en) | Belling machine for plastic pipeline | |
| CN220288320U (en) | Shell-and-tube heat exchanger | |
| CN208290410U (en) | Mould structure | |
| CN209257292U (en) | A kind of plastic mould | |
| CN213107893U (en) | Injection mold convenient to take off material | |
| CN215676579U (en) | Sealed load compensable shell-and-tube heat exchanger | |
| CN220031043U (en) | Pump plug mould |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |