A vacuum injection mold

Abstract

The utility model relates to the field of injection mold exhaust, and the utility model aims at providing a vacuum type injection mold, solves the problem of air trapping after mold closing, and provides a vacuum type injection mold, which comprises an upper module, an upper die, a lower module, a lower die and a vacuum pump, the upper die is arranged on the upper module, the lower die is arranged on the lower module, the upper die is located above the lower die, the air hole is connected with the air suction end of the vacuum pump, when the injection product is on the inner insert and the outer insert upper end, the first exhaust groove is butt joint with the cavity groove, the high temperature plastic is injected into the cavity groove, the vacuum pump is opened to indirectly perform vacuumizing on the first exhaust groove, but it is guaranteed that the vacuum pump will not adsorb the injection plastic, that is, the high temperature plastic will not enter the inner ring groove, until the high temperature plastic fills the cavity groove, so that the cavity groove will not store the gas, and the mold closing will not cause the air trapping, thereby solving the problem of air trapping after mold closing.

Description

Technical Field

[0001] This utility model relates to the field of venting injection molds, and in particular to a vacuum injection mold. Background Technology

[0002] Trapped air refers to the phenomenon where, after the mold closes, air and gases generated by the thermal decomposition of plastic within the cavity cannot be smoothly expelled during the melt filling process, ultimately becoming compressed at the end of the melt or in structural dead corners. Two-color injection molded products are particularly prone to trapped air. Existing venting methods involve designing and machining venting channels or adding venting inserts at the trapped air locations. Defects: If the venting channels are not located at the end of the melt filling or in the last filled area, the trapped air areas cannot be effectively vented. Venting channels that are too deep will cause flash (burrs) on the product, while those that are too shallow will result in poor venting. Inability to expel gas in a timely manner will affect the product's electroplating, leading to incomplete plating and affecting the product's appearance. Utility Model Content

[0003] The purpose of this invention is to provide a vacuum injection mold that solves the problem of air trapping after the mold is closed.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a vacuum injection mold, including an upper module, an upper mold core, a lower module, a lower mold core, and a vacuum pump. The upper mold core is disposed on the upper module, and the lower mold core is disposed on the lower module, with the upper mold core positioned above the lower mold core. The lower mold core has a lower mold cavity, and an outer insert and an inner insert are provided in the lower mold cavity. The outer insert has a through hole that passes through both ends of the outer insert in the axial direction. The inner insert is sleeved in the through hole, and the outer wall of the inner insert is in contact with the inner wall of the outer insert. The outer wall of the inner insert is provided with a first vent groove in the axial direction, the first vent groove has a radial opening that fits the inner wall of the outer insert, and a cavity groove is provided on the axial part of the inner wall of the outer insert, the first vent groove communicating with the cavity groove; The bottom ends of the outer insert and the inner insert are connected to the lower module. The bottom end of the inner insert is provided with an inner ring groove. The lower module is provided with an air hole. The inner ring groove is connected to the air hole and the first exhaust groove respectively. The air hole is connected to the suction end of the vacuum pump.

[0005] Optionally, the insert includes an integrally formed coarse insert and a fine insert, the first vent groove is disposed on the coarse insert, and the inner annular groove is located at the end of the fine insert.

[0006] Furthermore, the outer wall of the coarse insert is provided with a connecting groove and a third venting groove. The connecting groove is arranged around the coarse insert, and the third venting groove extends along the axial direction of the coarse insert. The connecting groove is connected to the third venting groove and the first venting groove respectively. The third venting groove and the first venting groove are located on both sides of the connecting groove, and the inner ring groove is connected to the third venting groove.

[0007] Furthermore, a fourth venting groove is provided at the bottom end of the coarse insert, and the two ends of the fourth venting groove are respectively connected to the inner ring groove and the third venting groove, and the fourth venting groove extends radially along the bottom end of the coarse insert.

[0008] Furthermore, an inner ring is provided on the solid within the through hole. The inner ring extends axially along the outer insert. The coarse insert overlaps the upper end of the inner ring. There is a gap between the outer wall of the fine insert and the inner wall of the inner ring. The fourth venting groove is located above the inner ring. The two ends of the gap are respectively connected to the fourth venting groove and the inner ring groove.

[0009] Furthermore, an alignment surface is provided on the outer wall of the fine insert, the alignment surface extends along the axial direction of the fine insert, and a first guide groove, a second guide groove, and a reference surface are provided on the inner wall of the inner ring, the reference surface extends along the axial direction of the inner ring, the alignment surface is in contact with the reference surface, the first guide groove and the second guide groove are provided on both sides of the reference surface, the alignment surface is located in the extension direction of the fourth exhaust groove, and the first guide groove and the second guide groove penetrate through the upper and lower ends of the inner ring.

[0010] Furthermore, the bottom end of the inner ring is higher than the bottom end of the outer insert, and an outer ring groove is formed between the bottom end of the inner ring and the bottom end of the outer insert. The outer ring groove surrounds the inner ring groove and communicates with the inner ring groove.

[0011] Optionally, a vacuum sensor is also included, which is disposed on the vacuum pump and is used to monitor the vacuum level in the vent. The vacuum sensor is signal-connected to the vacuum pump.

[0012] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: This utility model discloses a vacuum injection mold. Because the outer wall of the inner insert fits against the inner wall of the outer insert, the first venting groove is joined with the cavity groove to form an air passage. The inner ring groove communicates with the air hole and the air passage respectively. The air hole is connected to the suction end of a vacuum pump. When the product is injected into the upper part of the inner and outer inserts, the first venting groove connects to the cavity groove. High-temperature plastic is injected into the cavity groove. The vacuum pump is turned on to indirectly evacuate the first venting groove, but ensures that the vacuum pump does not adsorb the injected plastic, that is, the high-temperature plastic does not enter the inner ring groove, until the high-temperature plastic fills the cavity groove. In this way, no gas remains in the cavity groove, and no trapped air occurs when the mold closes. Therefore, the problem of trapped air after the mold closes is solved. Attached Figure Description

[0013] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings: Figure 1 This is a perspective view of a vacuum injection mold according to a preferred embodiment of the present invention; Figure 2 yes Figure 1 Exploded views of the outer insert, inner insert, and lower mold core shown; Figure 3 This is a cross-sectional view of the vents on the lower module; Figure 4 yes Figure 1 Enlarged view of section A shown; Figure 5 It is a bottom perspective view of the outer insert, inner insert, and lower mold core; Figure 6 It is a three-dimensional view showing the outer and inner parts separated; Figure 7 This is a second perspective view showing the outer and inner parts separated; Figure 8 It is a bottom view of the outer insert, inner insert, and lower mold core; Figure 9 yes Figure 8 An enlarged view of section B shown in the diagram.

[0014] The reference numerals in the attached figures are explained as follows: 1. Upper module; 2. Upper mold core; 3. Lower module; 4. Lower mold core; 5. Vacuum pump; 6. Vacuum sensor; 31. Air vent; 41. Lower mold cavity; 42. Outer insert; 43. Inner insert; 44. Through hole; 45. First vent groove; 46. Cavity groove; 47. Inner ring groove; 48. Inner ring; 49. Gap; 431. Coarse inlay; 432. Fine inlay; 433. Connecting groove; 434. Third vent groove; 435. Fourth exhaust groove; 436. Alignment surface; 481. First guide groove; 482. Second guide groove; 483. Reference surface; 484. Outer ring groove. Detailed Implementation

[0015] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. 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.

[0016] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0018] like Figure 1 and Figure 2 and Figure 3 As shown, a vacuum injection mold includes an upper module 1, an upper mold core 2, a lower module 3, a lower mold core 4, and a vacuum pump 5. The upper mold core 2 is disposed on the upper module 1 and is fixed to the upper module 1 by a screw. The lower mold core 4 is disposed on the lower module 3 and is fixed to the lower module 3 by a screw. The upper mold core 2 is located above the lower mold core 4.

[0019] The lower mold core 4 has a lower mold cavity 41, and an outer insert 42 and an inner insert 43 are provided in the lower mold cavity 41. The outer insert 42 has a through hole 44, which passes through both ends of the outer insert 42 in the axial direction. The inner insert 43 is fitted in the through hole 44, and the outer wall of the inner insert 43 fits against the inner wall of the outer insert 42. The top ends of the outer insert 42 and the inner insert 43 are engaged with the upper mold core 2.

[0020] An axial first venting groove 45 is provided on the outer wall of the inner insert 43, extending along the axial direction of the inner insert 43. A cavity groove 46 is provided on the axial side of the inner wall of the outer insert 42, which is used to accommodate a single-color product. There are several first venting grooves 45, each corresponding to a hole on the single-color product. The cavity groove 46 extends along the axial direction of the outer insert 42, and the first venting grooves 45 communicate with the cavity groove 46. The top opening of the first venting groove 45 communicates with the bottom opening of the cavity groove 46. The radial opening of the first venting groove 45 fits against the inner wall of the outer insert 42, and the radial opening end of the cavity groove 46 fits against the upper mold core 2. Thus, the cavity groove 46 is sealed in the radial direction. The cavity groove 46 contains a single-color injection molded product with a fine hole. This fine hole needs to be evacuated so that two-color injection plastic can be injected into the fine hole to form a two-color product.

[0021] The bottom ends of the outer insert 42 and the inner insert 43 are connected to the lower module 3. The bottom end of the inner insert 43 is provided with an inner ring groove 47. The upper surface of the lower module 3 has a sealing effect on the inner ring groove 47. The lower module 3 is provided with an air hole 31. The inner ring groove 47 is connected to the air hole 31 and the first exhaust groove 45 respectively. The air hole 31 is externally connected to the suction end of the vacuum pump 5.

[0022] This embodiment also includes a vacuum sensor 6, which is mounted on the vacuum pump 5. The vacuum sensor 6 is used to monitor the vacuum level inside the vent 31 and is connected to the vacuum pump 5 via a signal connection.

[0023] Furthermore, vacuum sensor 6 is connected to the PLC controller (not shown in the figure), and vacuum pump 5 is also connected to the PLC controller. When the product is to be injection molded on the upper part of the outer insert 42 and the inner insert 43, the feed port of the cavity groove 46 is connected to the injection end of the injection molding machine, and vacuum pump 5 is turned on. Vacuum pump 5 evacuates the air hole 31, and air hole 31 is connected to the first exhaust groove 45, that is, vacuum pump 5 is indirectly connected to the first exhaust groove 45. Vacuum sensor 6 transmits the vacuum level data detected in air hole 31 to PLC controller. When the vacuum level detected by vacuum sensor 6 reaches the set range, the PLC controller sends a signal to vacuum pump 5, so that the vacuum level in the first exhaust groove 45 and cavity groove 46 remains unchanged when vacuum pump 5 is drawing vacuum, but the high-temperature injection plastic is not drawn into the first exhaust groove 45. At the same time, the PLC controller sends a signal to the injection molding machine, and the injection molding machine starts to inject two-color molten plastic into the fine holes on the single-color product in cavity groove 46 until the fine holes on the single-color product in cavity groove 46 are filled with two-color molten plastic, and then the vacuum pump 5 and the injection molding machine are turned off.

[0024] like Figure 4As shown, when injection molding products is to be applied to the upper ends of the outer insert 42 and inner insert 43, the high-temperature two-color injection molding material is injected into the fine holes of the single-color product within the cavity groove 46. The inlet of the cavity groove 46 is connected to the injection end of the injection molding machine, and the lower port of the cavity groove 46 is connected to the upper port of the first venting groove 45. That is, the fine holes of the single-color product are connected to the upper port of the first venting groove 45. However, the gas in the fine holes of the single-color product within the cavity groove 46 is not easily vented, so the vacuum pump 5 is turned on, and the vacuum pump 5 begins to suck up the gas from the vent 31. Vacuuming is performed because the inner ring groove 47 is connected to the air hole 31 and the first exhaust groove 45, which indirectly evacuates the fine holes on the single-color product in the cavity groove 46. However, the vacuum pump 5 will not draw the two-color injection molding material into the first exhaust groove 45 and the inner ring groove 47. It will only reduce the gas in the fine holes on the single-color product in the cavity groove 46, allowing the two-color injection molding material to fill the fine holes on the single-color product, so that the two-color product is located in the fine holes on the single-color product. In this way, the single-color product and the two-color product constitute a complete molded product.

[0025] like Figure 5 and Figure 6 and Figure 7 As shown, the inner insert 43 includes an integrally formed coarse insert 431 and a fine insert 432. The first venting groove 45 is disposed on the coarse insert 431, the inner ring groove 47 is located at the bottom end of the fine insert 432, and the cavity groove 46 is disposed at the upper end of the outer insert 42.

[0026] The outer wall of the coarse insert 431 is provided with a connecting groove 433 and a third exhaust groove 434. The connecting groove 433 is arranged around the coarse insert 431, and the third exhaust groove 434 extends along the axial direction of the coarse insert 431. The connecting groove 433 is connected to the third exhaust groove 434 and the first exhaust groove 45 respectively. The third exhaust groove 434 and the first exhaust groove 45 are located on both sides of the connecting groove 433. The inner ring groove 47 is connected to the third exhaust groove 434. The outer insert 42 has a sealing effect on the connecting groove 433 and the third exhaust groove 434. The connecting groove 433 and the third exhaust groove 434 are equivalent to holes, so the gas in the connecting groove 433 and the third exhaust groove 434 will not disperse.

[0027] In addition, multiple first exhaust grooves 45 are arranged around the coarse insert 431. The first exhaust grooves 45 are connected to the connecting groove 433. Multiple cavity grooves 46 are arranged around the inner wall of the outer insert 42. In this way, multiple first exhaust grooves 45 are connected to the connecting groove 433. The connecting groove 433 has the function of collecting gas. Then the gas flows from the connecting groove 433 to the third exhaust groove 434, and from the third exhaust groove 434 it flows to the inner ring groove 47.

[0028] An inner ring 48 is provided on the solid inside the through hole 44. The inner ring 48 extends along the axial direction of the outer insert 42. The coarse insert 431 overlaps the upper end of the inner ring 48. There is a gap 49 between the outer wall of the fine insert 432 and the inner wall of the inner ring 48. The fourth exhaust groove 435 is located above the inner ring 48. The two ends of the gap 49 are connected to the fourth exhaust groove 435 and the inner ring groove 47, respectively.

[0029] The bottom end of the inner ring 48 is higher than the bottom end of the outer insert 42. An outer ring groove 484 is formed between the bottom end of the inner ring 48 and the bottom end of the outer insert 42. The outer ring groove 484 is arranged around the inner ring groove 47 and is connected to the inner ring groove 47.

[0030] The bottom end of the coarse insert 431 is provided with a fourth venting groove 435. The two ends of the fourth venting groove 435 are respectively connected to the inner ring groove 47 and the third venting groove 434. The fourth venting groove 435 extends radially along the bottom end of the coarse insert 431, and the fine insert 432 is located at the end of the fourth venting groove 435.

[0031] The inner ring 48 has a first guide groove 481, a second guide groove 482, and a reference surface 483 axially arranged on its inner wall. The reference surface 483 protrudes relative to the inner wall of the inner ring 48, that is, the reference surface 483 protrudes radially from the inner side to the outer side of the inner wall surface of the inner ring 48. The outer wall of the fine insert 432 has an alignment surface 436 axially arranged on its outer wall. The alignment surface 436 is recessed radially from the outer side to the inner side of the outer wall surface of the fine insert 432. The alignment surface 436 is located relative to the fine insert. The outer wall of the insert 432 is recessed, and the alignment surface 436 is in contact with the reference surface 483. In this way, the fine insert 432 cannot rotate in the through hole 44, and the outer insert 42 cannot rotate relative to the inner insert 43. The fine insert 432 is cylindrical. The first guide groove 481 and the second guide groove 482 are set on both sides of the reference surface 483. The alignment surface 436 is located at the end of the fourth exhaust groove 435. The first guide groove 481 and the second guide groove 482 pass through the upper and lower ends of the inner ring 48.

[0032] like Figure 8 and Figure 9 As shown, the first guide channel 481 and the second guide channel 482 are also connected to the gap 49, and the first guide channel 481 and the second guide channel 482 increase the gas flow rate.

[0033] The outer ring groove 484 and the inner ring groove 47 are spliced ​​together, and the gas flows between the outer ring groove 484 and the inner ring groove 47. The lower module 3 has a sealing effect on the outer ring groove 484 and the inner ring groove 47, so that the outer ring groove 484 and the inner ring groove 47 are only connected to the air hole 31 and the gap 49.

[0034] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the protection scope of this utility model.

Claims

1. A vacuum injection mold, comprising an upper module (1), an upper mold core (2), a lower module (3), a lower mold core (4), and a vacuum pump (5), wherein the upper mold core (2) is disposed on the upper module (1), the lower mold core (4) is disposed on the lower module (3), and the upper mold core (2) is located above the lower mold core (4), characterized in that, The lower mold core (4) has a lower mold cavity (41), and an outer insert (42) and an inner insert (43) are provided in the lower mold cavity (41). The outer insert (42) has a through hole (44), which passes through both ends of the outer insert (42) in the axial direction. The inner insert (43) is fitted in the through hole (44), and the outer wall of the inner insert (43) fits against the inner wall of the outer insert (42). The inner insert (43) has a first vent groove (45) axially arranged on its outer wall. The radial opening end of the first vent groove (45) is attached to the inner wall of the outer insert (42). The outer insert (42) has a cavity groove (46) axially arranged on its inner wall. The first vent groove (45) communicates with the cavity groove (46). The bottom ends of the outer insert (42) and the inner insert (43) are connected to the lower module (3). The bottom end of the inner insert (43) is provided with an inner ring groove (47). The lower module (3) is provided with an air hole (31). The inner ring groove (47) is connected to the air hole (31) and the first exhaust groove (45) respectively. The air hole (31) is connected to the suction end of the vacuum pump (5).

2. The vacuum injection mold according to claim 1, characterized in that, The inner insert (43) includes an integrally formed coarse insert (431) and a fine insert (432), the first vent groove (45) is disposed on the coarse insert (431), and the inner ring groove (47) is located at the bottom end of the fine insert (432).

3. The vacuum injection mold according to claim 2, characterized in that, The outer wall of the coarse insert (431) is provided with a connecting groove (433) and a third exhaust groove (434). The connecting groove (433) is arranged around the coarse insert (431). The third exhaust groove (434) extends along the axial direction of the coarse insert (431). The connecting groove (433) is connected to the third exhaust groove (434) and the first exhaust groove (45) respectively. The third exhaust groove (434) and the first exhaust groove (45) are located on both sides of the connecting groove (433). The inner ring groove (47) is connected to the third exhaust groove (434).

4. The vacuum injection mold according to claim 3, characterized in that, The bottom end of the coarse insert (431) is provided with a fourth exhaust groove (435), the two ends of the fourth exhaust groove (435) are respectively connected to the inner ring groove (47) and the third exhaust groove (434), and the fourth exhaust groove (435) extends radially along the bottom end of the coarse insert (431).

5. The vacuum injection mold according to claim 4, characterized in that, An inner ring (48) is provided on the solid inside the through hole (44). The inner ring (48) extends axially along the outer insert (42). The coarse insert (431) overlaps the upper end of the inner ring (48). There is a gap (49) between the outer wall of the fine insert (432) and the inner wall of the inner ring (48). The fourth exhaust groove (435) is located above the inner ring (48). The two ends of the gap (49) are respectively connected to the fourth exhaust groove (435) and the inner ring groove (47).

6. The vacuum injection mold according to claim 5, characterized in that, The outer wall of the fine insert (432) is provided with an alignment surface (436) in the axial direction. The inner wall of the inner ring (48) is provided with a first guide groove (481), a second guide groove (482) and a reference surface (483) in the axial direction. The alignment surface (436) is attached to the reference surface (483). The first guide groove (481) and the second guide groove (482) are located on both sides of the reference surface (483). The alignment surface (436) is located at the end of the fourth exhaust groove (435). The first guide groove (481) and the second guide groove (482) pass through the upper and lower ends of the inner ring (48).

7. The vacuum injection mold according to claim 6, characterized in that, The bottom end of the inner ring (48) is higher than the bottom end of the outer insert (42). An outer ring groove (484) is formed between the bottom end of the inner ring (48) and the bottom end of the outer insert (42). The outer ring groove (484) is arranged around the inner ring groove (47) and communicates with the inner ring groove (47).

8. The vacuum injection mold according to claim 1, characterized in that, It also includes a vacuum sensor (6), which is mounted on the vacuum pump (5). The vacuum sensor (6) is used to monitor the vacuum level in the vent (31), and the vacuum sensor (6) is signal-connected to the vacuum pump (5).

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