Injection molding structure of automobile grille

Abstract

The invention provides an automobile grille injection molding structure, relates to the technical field of molds, and solves the technical problems that in the prior art, sprues of automobile grilles are all formed in the outer surface of an air inlet grille, and after injection molding of products, the sprues are not prone to deformation. And after the excess material at the pouring gate formed after the product is formed is cut off, the negative influence on the quality of the outer surface of the product is caused. The device comprises a front mold plate, a valve needle type hot runner, a pitched roof block, a rear mold insert and a rear mold plate, the rear mold insert is inlaid on the rear mold plate, the front mold plate is connected with the rear mold plate through a guide rod, a product forming cavity is formed between the front mold plate and the rear mold insert, the pitched roof block is inlaid on the rear mold insert, the valve needle type hot runner is installed in the front mold plate, and the rear mold insert is connected with the rear mold plate through a guide rod. A conical main runner is arranged in the front mold plate; a sub-runner, branch runners and an inlet runner are arranged in the inclined ejector block, the inlet runner and all the branch runners are communicated with the sub-runner, and an outlet gate of each branch runner corresponds to the inner side of a lattice bar cavity on the product forming cavity.

Description

Technical Field

[0001] The present invention relates to the technical field of molds, and in particular to an injection molding structure for an automotive grille. Background Art

[0002] Automotive grilles are generally injection molded. In the prior art, since the distance between the slats in the automotive grille is relatively small, and the nozzles of the valve pin type hot runner in the injection mold are relatively large, it is impossible to use the inner surface of the automotive grille as a gate. Therefore, the gates of the automotive grille are all formed on the outer surface of the intake grille. After the product is injection molded, the remaining material at the gate formed after the product is molded has a negative impact on the outer surface quality of the product after being cut off. Summary of the Invention

[0003] The purpose of the present invention is to provide an injection molding structure for an automotive grille to solve the technical problem that in the prior art, the gates of the automotive grille are all formed on the outer surface of the intake grille, and after the product is injection molded, the remaining material at the gate formed after the product is molded has a negative impact on the outer surface quality of the product after being cut off. The many technical effects that can be produced by the preferred technical solutions provided by the present invention are described in detail below.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] An injection molding structure for an automotive grille provided by the present invention includes a front template, a valve pin type hot runner, a lifter block, a rear mold insert, and a rear template. Among them, the rear mold insert is embedded in the rear template, the front template and the rear template are connected by a guide rod, a product molding cavity is provided between the front template and the rear mold insert, the lifter block is embedded in the rear mold insert, the valve pin type hot runner is installed in the front template, a conical main runner is provided in the front template, and the outlet of the valve pin type hot runner corresponds to the conical main runner;

[0006] A sub-runner, a branch runner, and an inlet runner are provided inside the lifter block. The number of the branch runners is multiple. The inlet runner and all the branch runners are communicated with the sub-runner. The conical main runner is communicated with the inlet runner. The outlet gates of the branch runners all correspond to the inner sides of the slat cavities on the product molding cavity.

[0007] Optionally, a hot nozzle sleeve and a connecting ring are sleeved on the outer wall of the valve pin type hot runner. The connecting ring is connected to the front template by bolts. The upper end of the hot nozzle sleeve extends into the annular groove on the connecting ring, and there is an expansion gap between the upper end surface of the hot nozzle sleeve and the inner wall of the annular groove. [[ID=2,7]]

[0008] Optionally, it further includes a front mold top plate, a hot runner manifold plate, and a backing plate. The front mold top plate, the backing plate, and the front template are connected in sequence. An installation cavity is provided between the front mold top plate and the backing plate. The hot runner manifold plate is installed in the installation cavity. The inlet of the valve pin type hot runner is communicated with the branch of the hot runner manifold plate, and the driving part on the valve pin type hot runner is located above the hot runner manifold plate. The pouring channel on the front mold top plate is communicated with the runner channel in the hot runner manifold plate.

[0009] Optionally, the number of both the valve pin type hot runner and the lifter block is at least one.

[0010] Optionally, it further includes a lifter water inlet structure and a lifter water outlet structure. A water flow channel is further provided in the lifter block. One end of the lifter water inlet structure is connected to the water inlet end of the water flow channel, and one end of the lifter water outlet structure is connected to the water outlet end of the water flow channel. Both the lifter water inlet structure and the lifter water outlet structure are inclined.

[0011] Optionally, at least two first lifter channels are provided in the rear mold insert, and at least two second lifter channels are provided in the rear template. The first lifter channels and the second lifter channels are in one-to-one correspondence and communication. The lifter water inlet structure or the lifter water outlet structure sequentially passes through the corresponding second lifter channel and the first lifter channel.

[0012] Optionally, it further includes spacer blocks, a first ejector plate, a second ejector plate, and a rear mold bottom plate. The first ejector plate, the second ejector plate, and the rear mold bottom plate are stacked from top to bottom in sequence. The spacer blocks are connected between the rear mold bottom plate and the rear template. The number of spacer blocks is three, and the three spacer blocks are respectively arranged around the circumferential side wall of the second ejector plate. The ends of a set of guide rods are installed on the first ejector plate, and the ends of another set of guide rods are installed on the second ejector plate.

[0013] Optionally, at least two installation openings are provided on the first ejector plate, the second ejector plate, and the rear mold bottom plate. The end of the lifter water inlet structure or the lifter water outlet structure is installed at the corresponding installation opening.

[0014] Optionally, a cooling well and an exhaust groove are further provided on the lifter block.

[0015] Optionally, an installation channel is provided in the front template. The installation channel is located above the conical main runner and is communicated with it. The valve pin type hot runner is installed in the installation channel;

[0016] The upper end face of the rear mold insert is provided with a recess inward, and the lifter block is embedded in the recess.

[0017] An injection molding structure for an automotive grille provided by the present invention has a product molding cavity disposed between a front template and a rear mold insert. A conical main runner is provided within the front template, and a valve pin type hot runner is installed within the front template. The outlet of the valve pin type hot runner corresponds to the conical main runner. The conical main runner passes between two adjacent grid bars on the automotive grille, such that the conical main runner aligns with the inlet runner on the lifter block, thereby reducing the gate size of the valve pin type hot runner. By using the lifter block structure, the molten plastic is guided to the lower part of the product molding cavity through the sub-runners. At the same time, the gate of each sub-runner corresponds to the inner side of a grid bar cavity, achieving the splitting of the molten plastic and allowing the molten plastic to enter the mold at multiple positions on the inner side of the product. In this way, the filling effect of the plastic injection is good, and it does not affect the appearance quality. At the same time, the gate residue after the product is injection molded is located on the inner surface of the automotive grille and does not affect the outer surface of the automotive grille, solving the technical problem in the prior art that the gates of automotive grilles are all formed on the outer surface of the intake grille, and after the product is injection molded, the gate residue formed after the product is molded has a negative impact on the outer surface quality of the product after being cut off. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following described drawings are only some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 is a schematic structural diagram of the injection molding structure for an automotive grille provided by an embodiment of the present invention;

[0020] Figure 2 is Figure 1 a schematic structural diagram lacking the front mold top plate;

[0021] Figure 3 is Figure 2 a top view of

[0022] Figure 4 is Figure 3 a sectional view taken along line A-A in

[0023] Figure 5 is Figure 2 a schematic structural diagram lacking the backing plate;

[0024] Figure 6 is Figure 5 a schematic structural diagram lacking the hot runner manifold;

[0025] Figure 7 is Figure 6 a schematic structural diagram lacking the front template;

[0026] Figure 8 is Figure 7 a schematic structural view of the mold lacking a rear mold insert;

[0027] Figure 9 is Figure 8 a schematic structural view of the mold lacking a rear template;

[0028] Figure 10 is a schematic structural view of the connection of the valve pin type hot runner, lifter block, lifter water inlet structure and lifter water outlet structure of the automotive grille injection molding structure provided by an embodiment of the present invention;

[0029] Figure 11 is a schematic structural view of the connection of the valve pin type hot runner and the lifter block of the automotive grille injection molding structure provided by an embodiment of the present invention;

[0030] Figure 12 is a schematic structural view of the lifter block of the automotive grille injection molding structure provided by an embodiment of the present invention;

[0031] Figure 13 is a sectional view of the lifter block of the automotive grille injection molding structure provided by an embodiment of the present invention;

[0032] Figure 14 is a schematic structural view of the rear mold insert of the automotive grille injection molding structure provided by an embodiment of the present invention.

[0033] In the figure, 1 is the front template; 11 is the installation channel; 12 is the tapered main runner;

[0034] 2 is the valve pin type hot runner; 21 is the nozzle sleeve; 22 is the connecting ring;

[0035] 3 is the lifter block; 31 is the sub - runner; 32 is the branch runner; 33 is the inlet runner; 34 is the water flow channel; 35 is the cooling well; 36 is the exhaust groove;

[0036] 4 is the rear mold insert; 41 is the recessed groove;

[0037] 5 is the rear template;

[0038] 6 is the front mold top plate;

[0039] 7 is the hot runner manifold;

[0040] 8 is the backing plate;

[0041] 9 is the lifter water inlet structure;

[0042] 10 is the lifter water outlet structure;

[0043] 20 is the spacer block;

[0044] 30 is the first ejector plate;

[0045] 40. Second ejector plate;

[0046] 50. Rear mold bottom plate. Detailed implementation manner

[0047] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation manners obtained by those of ordinary skill in the art without creative efforts fall within the scope protected by the present invention.

[0048] In the description of the present invention, it should be noted that unless otherwise specified, the meaning of "a plurality of" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0049] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0050] The present invention provides an injection molding structure for an automobile grille, including a front template 1, a valve needle type hot runner 2, a lifter block 3, a rear mold insert 4 and a rear template 5. Among them, the rear mold insert 4 is embedded in the rear template 5, the front template 1 and the rear template 5 are connected by a guide rod, a product molding cavity is arranged between the front template 1 and the rear mold insert 4, the lifter block 3 is embedded in the rear mold insert 4, the valve needle type hot runner 2 is installed in the front template 1, a conical main runner 12 is arranged in the front template 1, the outlet of the valve needle type hot runner 2 corresponds to the conical main runner 12, and the inner diameter of the conical main runner 12 is smaller than the nozzle diameter of the valve needle type hot runner 2, so that the valve needle type hot runner 2 can inject glue in a narrow space;

[0051] A sub - ejector block 3 is internally provided with a runner 31, branch runners 32 and an inlet runner 33. The number of the branch runners 32 is multiple. The inlet runner 33 and all the branch runners 32 are communicated with the runner 31. The conical main runner 12 is communicated with the inlet runner 33. The outlet gates of the branch runners 32 correspond to the inner sides of the grid cavities on the product molding cavity, that is, the number of the branch runners 32 is the same as the number of the grid cavities, and the branch runners 32 and the grid cavities are in one - to - one correspondence. The outlet gates of the branch runners 32 are relatively wide, which is beneficial to the injection of glue and convenient for filling the cavity. Moreover, when removed, it will not affect the appearance. An injection molding structure of an automobile grille provided by the present invention has a product molding cavity arranged between a front template 1 and a rear mold insert 4. A conical main runner 12 is arranged in the front template 1. A valve - pin type hot runner 2 is installed in the front template 1. The outlet of the valve - pin type hot runner 2 corresponds to the conical main runner 12. The conical main runner 12 passes through the space between two adjacent grids on the automobile grille, so that the conical main runner 12 is aligned with the inlet runner 33 on the sub - ejector block 3, thereby reducing the injection size of the valve - pin type hot runner 2. By using the sub - ejector block 3 structure, the molten plastic is guided to the lower part of the product molding cavity through the runner 31. At the same time, the outlet gate of each branch runner 32 corresponds to the inner side of a grid cavity, realizing the splitting of the molten plastic and injecting the plastic at multiple positions on the inner side of the product simultaneously. In this way, the injection filling effect is good, and it does not affect the appearance quality. At the same time, the gate residue after the product is injection - molded is located on the inner surface of the automobile grille and will not affect the outer surface of the automobile grille, solving the technical problem in the prior art that the gates of the automobile grille are all formed on the outer surface of the intake grille, and after the product is injection - molded, the gate residue formed at the gate after the product is molded has a negative impact on the outer surface quality of the product after being cut off.

[0052] As an alternative implementation, a nozzle sleeve 21 and a connecting ring 22 are sleeved on the outer wall of the valve pin type hot runner 2. The connecting ring 22 is connected to the front template 1 by bolts. The upper end of the nozzle sleeve 21 extends into the annular groove on the connecting ring 22. The connecting ring 22 is installed at the upper end of the installation channel 11 and is connected by bolts. In the normal temperature state, there is an expansion gap between the upper end face of the nozzle sleeve 21 and the inner wall of the annular groove. When the valve pin type hot runner 2 is in the injection molding operation, the nozzle sleeve 21 will be heated. Due to the relatively long nozzle sleeve 21, a relatively large size increase will occur. The expansion gap provides the expansion space for the nozzle sleeve 21, so that the mold components will not be damaged. The nozzle sleeve 21 is sleeved on the outer wall of the valve pin type hot runner 2 and can wrap the nozzle on the valve pin type hot runner 2. The opening and closing action of the valve pin directly passes through the opening of the nozzle and cooperates with the opening of the nozzle sleeve 21, so as to realize the opening and blocking of the valve pin type hot runner 2. And the nozzle sleeve 21 can be quickly disassembled and assembled, and the disassembly and assembly of the nozzle sleeve 21 saves more time. In addition, the nozzle sleeve 21 can be made of a material harder than the nozzle, so as to increase the wear resistance of the nozzle sleeve 21, and further increase the service life of the nozzle sleeve 21, so that the working time of the valve pin type hot runner 2 is increased.

[0053] As an alternative implementation, it further includes a front mold top plate 6, a hot runner manifold 7 and a backing plate 8. The front mold top plate 6, the backing plate 8 and the front template 1 are connected in sequence. An installation cavity is provided between the front mold top plate 6 and the backing plate 8. The hot runner manifold 7 is installed in the installation cavity. The inlet of the valve pin type hot runner 2 is communicated with the branch of the hot runner manifold 7 and the driving part on the valve pin type hot runner 2 is located above the hot runner manifold 7. The pouring channel on the front mold top plate 6 is communicated with the runner channel in the hot runner manifold 7. The molten plastic will be poured into the upper end of the pouring channel on the front mold top plate 6, enter the runner channel in the hot runner manifold 7 along the pouring channel, then enter the valve pin type hot runner 2, and then under the drive of the driving part, the opening between the valve pin and the nozzle sleeve 21 is opened, so that the molten plastic will sequentially pass through the tapered main runner 12, the inlet runner 33, the branch runner 32 and the sub-runner 31 along the opening, and finally enter the product molding cavity.

[0054] As an alternative implementation, there is at least one valve pin type hot runner 2 and at least one lifter block 3. Each branch of the hot runner manifold 7 can be correspondingly connected to a valve pin type hot runner 2, so as to realize rapid injection.

[0055] As an alternative implementation, it further includes an inclined ejector pin water inlet structure 9 and an inclined ejector pin water outlet structure 10. A water flow channel 34 is also provided inside the inclined ejector pin block 3. One end of the inclined ejector pin water inlet structure 9 is connected to the water inlet end of the water flow channel 34 and is connected by a pin shaft. One end of the inclined ejector pin water outlet structure 10 is connected to the water outlet end of the water flow channel 34 and is connected by a pin shaft. Both the inclined ejector pin water inlet structure 9 and the inclined ejector pin water outlet structure 10 are inclined. At least two installation through holes are provided on the first ejector pin plate 30, the second ejector pin plate 40, and the rear mold bottom plate 50. The end of the inclined ejector pin water inlet structure 9 or the inclined ejector pin water outlet structure 10 is installed at the corresponding installation through hole. The lower ends of both the inclined ejector pin water inlet structure 9 and the inclined ejector pin water outlet structure 10 are connected to the cold water tank through a pipeline. The inclined ejector pin water inlet structure 9 and the inclined ejector pin water outlet structure 10 are used to hold the inclined ejector pin block 3, and at the same time, to realize cold water circulation and cool the inclined ejector pin block 3.

[0056] As an alternative implementation, at least two first inclined ejector pin channels are provided inside the rear mold insert 4, and at least two second inclined ejector pin channels are provided inside the rear mold plate 5. The first inclined ejector pin channels and the second inclined ejector pin channels are in one-to-one correspondence and communication. The inclined ejector pin water inlet structure 9 or the inclined ejector pin water outlet structure 10 sequentially passes through the corresponding second inclined ejector pin channel and the first inclined ejector pin channel.

[0057] As an alternative implementation, it further includes spacer blocks 20, a first ejector pin plate 30, a second ejector pin plate 40, and a rear mold bottom plate 50. The first ejector pin plate 30, the second ejector pin plate 40, and the rear mold bottom plate 50 are stacked in sequence from top to bottom. The spacer blocks 20 are connected between the rear mold bottom plate 50 and the rear mold plate 5. Both the first ejector pin plate 30 and the second ejector pin plate 40 are of T-shaped structure. The number of spacer blocks 20 is three, and the three spacer blocks 20 are respectively arranged around the circumferential side wall of the second ejector pin plate 40. The ends of a set of guide rods are installed on the first ejector pin plate 30, and the ends of another set of guide rods are installed on the second ejector pin plate 40.

[0058] As an alternative implementation, a cooling well 35 and an exhaust groove 36 are also provided on the inclined ejector pin block 3. The cooling well 35 corresponds to the inlet flow channel 33, and the exhaust groove 36 is located below the inclined ejector pin block 3. An installation channel 11 is provided inside the front mold plate 1. The installation channel 11 is located above the conical main runner 12 and the two are connected. The valve pin type hot runner 2 is installed in the installation channel 11; the upper end surface of the rear mold insert 4 is provided with a sunken groove inward, and the inclined ejector pin block 3 is embedded in the sunken groove.

[0059] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An injection molding structure for an automobile grille, characterized in that, It includes a front template (1), a valve needle type hot runner (2), a lifter block (3), a rear mold insert (4) and a rear template (5). Among them, the rear mold insert (4) is embedded in the rear template (5), the front template (1) is connected to the rear template (5) through guide rods, a product forming cavity is arranged between the front template (1) and the rear mold insert (4), the lifter block (3) is embedded in the rear mold insert (4), the valve needle type hot runner (2) is installed in the front template (1), a conical main runner (12) is arranged in the front template (1), and the outlet of the valve needle type hot runner (2) corresponds to the conical main runner (12); a sub - runner (31), branch runners (32) and an inlet runner (33) are arranged inside the lifter block (3), the number of the branch runners (32) is multiple, the inlet runner (33) and all the branch runners (32) are communicated with the sub - runner (31), the conical main runner (12) is communicated with the inlet runner (33), and the pouring ports of the branch runners (32) correspond to the inner sides of the grid cavities on the product forming cavity.

2. The injection molding structure of the automotive grille according to claim 1, characterized in that, A hot nozzle sleeve (21) and a connecting ring (22) are sleeved on the outer wall of the valve needle type hot runner (2), the connecting ring (22) is connected to the front template (1) through bolts, the upper end of the hot nozzle sleeve (21) extends into the annular groove on the connecting ring (22), and there is an expansion gap between the upper end face of the hot nozzle sleeve (21) and the inner wall of the annular groove.

3. The injection molding structure of the automotive grille according to claim 1, characterized in that, It further includes a front mold top plate (6), a hot runner manifold (7) and a backing plate (8). The front mold top plate (6), the backing plate (8) and the front template (1) are connected in sequence. An installation cavity is arranged between the front mold top plate (6) and the backing plate (8), the hot runner manifold (7) is installed in the installation cavity, the inlet of the valve needle type hot runner (2) is communicated with the branch of the hot runner manifold (7), and the driving part on the valve needle type hot runner (2) is located above the hot runner manifold (7). The pouring channel on the front mold top plate (6) is communicated with the flow channel inside the hot runner manifold (7).

4. The injection molding structure of the automotive grille according to claim 1, characterized in that, The number of both the valve needle type hot runner (2) and the lifter block (3) is at least one.

5. The injection molding structure of the automotive grille according to claim 1, wherein, It further includes a lifter water inlet structure (9) and a lifter water outlet structure (10). A water flow channel (34) is further arranged inside the lifter block (3). One end of the lifter water inlet structure (9) is connected to the water inlet end of the water flow channel (34), and one end of the lifter water outlet structure (10) is connected to the water outlet end of the water flow channel (34). Both the lifter water inlet structure (9) and the lifter water outlet structure (10) are inclined.

6. The injection molding structure of the automobile grille according to claim 5, characterized in that, At least two first lifter channels are arranged inside the rear mold insert (4), at least two second lifter channels are arranged inside the rear template (5), the first lifter channels and the second lifter channels are in one - to - one correspondence and communication, and the lifter water inlet structure (9) or the lifter water outlet structure (10) sequentially passes through the corresponding second lifter channel and the first lifter channel.

7. The injection molding structure of the automobile grille according to claim 5, characterized in that, It further includes a square iron (20), a first ejector plate (30), a second ejector plate (40) and a rear mold bottom plate (50). The first ejector plate (30), the second ejector plate (40) and the rear mold bottom plate (50) are stacked in sequence from top to bottom. The square iron (20) is connected between the rear mold bottom plate (50) and the rear template (5). The number of the square irons (20) is three, and the three square irons (20) respectively surround the circumferential side wall of the second ejector plate (40). The ends of a set of guide rods are installed on the first ejector plate (30), and the ends of another set of guide rods are installed on the second ejector plate (40).

8. The injection molding structure of the automotive grille according to claim 7, wherein, At least two mounting through-holes are provided on each of the first ejector plate (30), the second ejector plate (40) and the rear mold bottom plate (50), and the end of the inclined ejector water inlet structure (9) or the inclined ejector water outlet structure (10) is installed at the corresponding mounting through-hole.

9. The injection molding structure of the automotive grille according to claim 1, wherein A cooling well (35) and an exhaust groove (36) are further provided on the inclined ejector block (3).

10. The injection molding structure of the automotive grille according to claim 1, characterized in that, An installation channel (11) is provided in the front template (1). The installation channel (11) is located above the conical main runner (12) and the two are connected. The valve needle type hot runner (2) is installed in the installation channel (11); A recessed groove (41) is provided inward on the upper end face of the rear mold insert (4), and the inclined ejector block (3) is embedded in the recessed groove (41).

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