A worm injection mold

Abstract

The worm injection mold comprises a movable mold core and a stationary mold core, the stationary mold core is provided with two worm forming stations capable of alternating positions, the movable mold core is provided with an injection station and a demolding mechanism corresponding to the two worm forming stations, the injection station is used for injection molding towards one of the worm forming stations during the first time of mold closing, the first driver drives the two worm forming stations to change positions during mold opening, the injection station is used for injection molding towards the other worm forming station during the second time of mold closing, and the demolding mechanism drives the injection molded worm to rotate and demold at the same time of injection molding, and the reciprocating is repeated, and the integration of worm forming and demolding is realized in each mold closing process. The worm injection mold disclosed by the application replaces the existing manual demolding with automatic demolding, reduces the labor intensity of the operator, and improves the production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of molds, in particular to a worm injection mold. Background Art

[0002] Plastic worms are widely used in modern industry. Plastic worms are often paired with turbines to transmit motion and power between two staggered shafts. Worm transmission is equivalent to spiral transmission and is a multi-tooth meshing transmission, so the transmission is smooth and the noise is very low. When producing plastic worms, most of them need to be injection molded with the help of molds.

[0003] The traditional worm injection mold uses the cold runner point-injection method. After the injection of one mold is completed, the worm and the mold insert need to be ejected together. Since there is a threaded through hole for forming the external thread of the worm on the insert, after the mold is opened, the worm needs to be removed from the insert by hand (such as manual rotation or tools such as a screwdriver). Specifically, the worm is separated from the insert by rotation. After the worm is taken out, the threaded insert is put back into the mold in turn, and then the mold is closed for production.

[0004] This traditional manual pickup method has the following drawbacks:

[0005] 1. Manually removing the inserts from the worm will increase production time and thus reduce production efficiency; the labor intensity of employees is high, and improper operation will damage the worm and increase production costs;

[0006] 2. Threaded inserts need to be replaced frequently, which means that at least twice as many inserts need to be made. If the operation is improper, the mold may be pressed or damaged, which will reduce the service life of the mold and increase costs. Summary of the Invention

[0007] The technical problem to be solved by the present invention is: in order to overcome the defects of the prior art, a worm injection mold is provided which replaces the existing manual demoulding with automated demoulding, reduces the labor intensity of operators and improves production efficiency.

[0008] The technical solution adopted by the present invention is: to provide a worm injection mold, including a movable mold base and a static mold base, the movable mold base is provided with a hot runner system, and the movable mold base is provided with a movable mold core connected to the hot runner system at one end close to the static mold base; the static mold base is provided with a static mold core cooperating with the movable mold core, and the static mold core is provided with two worm molding stations, and the static mold base is provided with a first drive for driving the two worm molding stations to alternately change positions; the movable mold core is provided with an injection molding station and a demolding mechanism corresponding to the two worm molding stations, and the injection molding station is connected to the hot runner system; when the mold is closed for the first time, the injection molding station injects toward one of the worm molding stations, and when the mold is opened, the first drive drives the two worm molding stations to change positions; when the mold is closed again, the injection molding station injects toward the other worm molding station, and at the same time of injection molding, the demolding mechanism drives the injection-molded worm to rotate and demold, and so on. In this reciprocating manner, in each mold closing process, the integrated process of worm molding and demolding is realized.

[0009] Compared with the prior art, the present invention has the following advantages:

[0010] In the worm injection mold structure of the present invention, the static mold core structure is redesigned, two worm molding stations are set on the static mold core, and the two worm molding stations can reciprocate and exchange positions with each other. Injection molding stations and demolding mechanisms are set on the movable mold core corresponding to the two worm molding stations. In the continuous mold opening and closing process, when the mold is opened, the positions between the two worm molding stations are switched. When the mold is closed, injection molding and automatic demolding can be carried out simultaneously in combination with the demolding mechanism, which reduces production time and improves production efficiency. In addition, automatic demolding replaces manual demolding and manual placement of inserts, reduces the labor intensity of employees and the risk of mold damage, and stabilizes product quality.

[0011] As an improvement, the static mold core is symmetrically provided with m cavities along the circumference, where m is an even number greater than or equal to 2. Each worm forming station includes m / 2 cavities. The m / 2 cavities of each worm forming station are arranged sequentially along the circumference or staggered with the m / 2 cavities of another worm forming station. The number of cavities determines the number of worms formed in each mold, i.e., the work efficiency. In this structure, the value of parameter m is set to ensure smooth switching between the two worm forming stations, thereby improving work efficiency.

[0012] Preferably, the static mold core is provided with two groups of molding cavities at 90° angles along the circumference, and each group of molding cavities includes a plurality of molding holes arranged symmetrically. The two groups of molding cavities are simple in structure and easy to operate.

[0013] Further improved, a detachable insert is provided in the forming hole, and the insert is provided with a threaded through hole for forming the external thread of the worm; the injection molding station includes multiple core shafts for forming the inner hole of the worm, and when the mold is closed, the core shafts are inserted and fitted in the threaded through holes.

[0014] Further improved, the demoulding mechanism includes multiple demoulding shafts and a second driver that drives the demoulding shaft to rotate, one end of the demoulding shaft is connected to the second driver, and the other end is linked with the end of the worm; a demoulding through hole for the worm to pass through is provided at a position corresponding to the demoulding mechanism on the static mold base, and when the mold is closed, the second driver drives the demoulding shaft to rotate, thereby driving the worm to rotate, so that the worm can pass through the demoulding through hole after being separated from the insert.

[0015] In a further improvement, a guide slot is provided at one end of the static mold seat away from the static mold core, and the demoulding through hole is connected to the guide slot. The provision of the guide slot structure in this structure makes it more convenient to collect the worms after demoulding.

[0016] Further improvement, the movable mold core is provided with a fixed block, and the multiple demoulding shafts are rotatably engaged on the fixed block; the demoulding shaft is provided with a driven gear, and the fixed block is rotatably provided with a driving shaft, one end of the driving shaft is provided with a first gear meshing with each driven gear, and the other end of the driving shaft is provided with a second gear, and the outside of the second gear is equipped with a transmission chain, and the other end of the transmission chain is engaged with the output shaft of the second driver.

[0017] In a further improvement, the fixed block is provided with a mounting hole, into which one end of the demolding shaft slidably fits axially. An elastic member is sheathed around the exterior of the demolding shaft, one end of which is connected to the fixed block and the other end to the end face of the driven gear. The provision of the elastic member allows the end of the demolding shaft closest to the static mold core to extend further beyond the surface of the dynamic mold core due to the elastic force. This allows the end of the demolding shaft to pre-engage the end face of the worm gear when the dynamic and static mold bases are not in contact during mold closing, improving the accuracy of subsequent demolding.

[0018] As a further improvement, the static mold base is provided with a receiving cavity at one end close to the dynamic mold base, and the static mold core is circumferentially rotatable in the receiving cavity; the first driver drives the static mold core to rotate forward and backward to realize the alternating position of the two worm forming stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the existing worm structure diagram.

[0020] Figure 2 It is a structural schematic diagram of a worm injection mold in the mold opening state of the present invention.

[0021] Figure 3This is a structural diagram from another angle of a worm injection mold of the present invention.

[0022] Figure 4 It is a cross-sectional view of a worm injection mold of the present invention in a mold opening state.

[0023] Figure 5 This is a simplified structural diagram of a worm injection mold in the mold opening state of the present invention.

[0024] Figure 6 This is a simplified structural diagram of a worm injection mold of the present invention in the mold opening state from another angle.

[0025] Figure 7 It is a partial structural diagram of the cooperation structure between the demoulding mechanism and the static mold core in the present invention.

[0026] Figure 8 It is a structural diagram of the movable mold core in the present invention.

[0027] Figure 9 This is another angle structural diagram of the movable mold core in the present invention.

[0028] Figure 10 This is a structural diagram of the static mold core in another embodiment of the present invention. (Arrangement 1)

[0029] Figure 11 This is a structural diagram of the static mold core in another embodiment of the present invention. (Arrangement 2)

[0030] Among them, 100-worm, 100.1-matching hole

[0031] 1-movable mold base, 2-static mold base, 2.1-accommodating cavity, 2.2-guide groove, 2.3-demolding through hole, 3-movable mold core, 4-static mold core, 5-hot runner system, 6-insert, 6.1-threaded through hole, 7-core shaft, 8-demolding shaft, 8.1-driven gear, 9-second driver, 10-fixed block, 11-driving shaft, 11.1-first gear, 11.2-second gear, 12-transmission chain, 13-elastic member, 14-bottom plate, 15-opening. DETAILED DESCRIPTION

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0033] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the term "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances. In addition, in the description of the present application, the terms "first", "second" are only for the convenience of description, for the purpose of distinguishing, and do not have specific meaning.

[0034] As shown in Figure 2 、 4 The present application provides a worm injection mold, which comprises a movable mold base 1 and a fixed mold base 2, the movable mold base 1 is provided with a hot runner system 5, and the movable mold base 1 is provided with a movable mold core 3 in communication with the hot runner system 5 at one end close to the fixed mold base 2; the fixed mold base 2 is provided with a fixed mold core 4 matched with the movable mold core 3, and the fixed mold core 4 is provided with two worm forming stations, and the fixed mold base 2 is provided with a first driver for driving the two worm forming stations to replace positions alternately; specifically, in the embodiment, a containing cavity 2.1 is arranged at one end of the fixed mold base 2 close to the movable mold base 1, and the fixed mold core 4 is rotatably installed in the containing cavity 2.1; the fixed mold core 4 is driven by the first driver to rotate forward and backward reciprocatingly, so as to realize the replacement of positions of the two worm forming stations alternately. More specifically, in order to improve the rotation flexibility of the fixed mold core 4, a bearing is installed in the containing cavity 2.1, and the fixed mold core 4 is correspondingly matched in the inner hole of the bearing.

[0035] In addition, an injection molding station and a demolding mechanism are provided on the movable mold core 3 corresponding to the two worm molding stations, wherein the injection molding station is connected to the hot runner system 5; in this structure, when the mold is closed for the first time, the injection molding station pre-injects toward the corresponding worm molding station, and the first mold is opened after the worm 100 is formed. After the mold is opened, the first driver drives the static mold core 4 to rotate, so that the two worm molding stations exchange positions with each other; that is, the worm molding station originally corresponding to the injection molding station switches to the one corresponding to the demolding mechanism, and the worm molding station originally corresponding to the demolding mechanism switches to the one corresponding to the injection molding station. When the mold is closed again, the injection molding station injects toward the other worm molding station, and at the same time, the demolding mechanism drives the worm 100 that has been completed by injection molding during the first mold closing to rotate and demold; in this reciprocating manner, in each mold closing process, the integrated process of worm molding and demolding is realized. Specifically, after the first mold closing and injection molding is completed, each subsequent mold closing can achieve that while the injection molding station is molding the worm 100 at another worm molding station, the demoulding mechanism causes the worm 100 molded in the previous mold closing to separate from the corresponding mold cavity, thereby realizing automatic demoulding and unloading of the worm 100. The entire process is: mold closing, molding the worm 100 in one of the worm molding cavities; mold opening, the two worm molding stations exchange positions with each other; mold closing, molding the worm at another worm molding station, and demoulding and unloading the worm that was molded in the previous mold closing; thus, the automatic molding, demoulding and unloading of the worm 100 are realized in the continuous mold opening and mold closing process. The entire process is completed automatically, and there is no need for manual operation to unload the worm 100, thereby improving work efficiency. Moreover, in this worm injection mold, when the mold is opened, only the positions of the two worm molding stations need to be switched, and there is no need to operate the worm 100 to be demolded. The demolding and unloading of the worm 100 is synchronized with the demolding during the next mold closing and injection molding. This process further saves the intermediate demolding and material collection time.

[0036] Specifically, m component cavities are symmetrically arranged along the circumferential direction on the static mold core 4, where m is an even number greater than or equal to 2, and each worm forming station includes m / 2 component cavities; and the m / 2 component cavities corresponding to each worm forming station are arranged sequentially along the circumferential direction or staggered with the m / 2 component cavities of another worm forming station.

[0037] In this embodiment, specifically Figure 7 As shown, two groups of molding cavities are symmetrically arranged on the static mold core 4, denoted as the first molding cavity 01 and the second molding cavity 02. The first molding cavity 01 and the second molding cavity 02 are arranged at a 90° angle. In this way, when switching between the two groups of molding cavities, the static mold core 4 can be rotated 90°.

[0038] In yet another embodiment, arrangement method 1:

[0039] like Figure 10As shown, six groups of molding cavities are symmetrically arranged on the static mold core 4, and each worm forming station includes three groups of molding cavities, namely, A and B in the figure. Specifically, in this embodiment, the three groups of molding cavities in each worm forming station are arranged in a circumferential sequence. Therefore, when switching between worm forming stations A and B, the static mold core 4 only needs to be rotated 90 degrees in the clockwise or counterclockwise direction.

[0040] Arrangement method 2:

[0041] like Figure 11 As shown, six groups of molding cavities are symmetrically arranged on the static mold core 4, as shown in A and B in the figure; and each worm forming station includes three groups of molding cavities, that is, the three symmetrical A's are one worm forming station, and the three B's are another worm forming station. Specifically, in this embodiment, the three groups of molding cavities of each worm forming station are staggered with the three groups of molding cavities of another worm forming station in the circumferential direction. More specifically, on the movable mold core 3, an injection molding station is set corresponding to the station where A is located, and a demoulding mechanism is set corresponding to the station where B is located. Each time the static mold core 4 is driven to rotate back and forth 30° in a clockwise or counterclockwise direction, the position switching of the two stations where A and B are located can be realized. To put it simply, taking clockwise as an example, the entire molding process is: the first mold closing, injection molding at the station where A is located; mold opening, the static mold core 4 rotates 30° clockwise, and the two stations where A and B are located are switched with each other; mold closing again, injection molding at the station where B is located, and the demoulding mechanism drives the worm gear formed at the station where A is located to demould; mold opening again, the static mold core 4 rotates 30° clockwise and counterclockwise, and the two stations where A and B are located are switched back; mold closing again, injection molding at the station where A is located, and the demoulding mechanism drives the worm gear formed at the station where B is located to demould. By repeating this action continuously, the automatic molding, automatic demoulding and unloading process of the worm gear can be realized.

[0042] Specifically, in this embodiment, the structure of the demoulding mechanism is specifically described using a structure of two groups of molding cavities:

[0043] like Figure 5 、 6 As shown in Figures 7 and 8, the two groups of molding cavities are arranged at an angle of 90 degrees, and each group of molding cavities includes a plurality of molding holes 4.1 that are symmetrically arranged. More specifically, each group of molding cavities includes eight molding holes 4.1, and the eight molding holes 4.1 are symmetrically distributed, with four molding holes 4.1 on each side. A detachable insert 6 is provided in each molding hole 4.1, and the insert 6 is provided with a threaded through hole 6.1 for molding the external thread of the worm 100, that is, eight worm 100 products can be injection molded at one time. In addition, the injection molding station includes a plurality of core shafts 7 for molding the inner hole of the worm 100. Specifically, in this embodiment, the core shaft 7 is integrally formed on the side of the movable mold core 3 close to the static mold core 4, as shown in Figure 8. Figure 9As shown. When the mold is closed, the core shaft 7 is inserted and fitted into the threaded through hole 6.1, and an injection hole 3.1 is provided on the movable mold core 3 near the core shaft 7. Corresponding extrusion cavities 3.2 are provided on the side of the movable mold core 3 near the hot runner system, corresponding to each core shaft 7. The injection hole 3.1 is located at the bottom of the extrusion cavity 3.2; and the injection hole 3.1 is connected to the threaded through hole 6.1, so that the molten material in the hot runner system 5 enters the threaded through hole 6.1 from the injection hole 3.1 to inject the worm. More specifically, in this structure, a molding protrusion for forming a mating hole 100.1 at the end of the worm 100 is provided at the end of the core shaft 7 near the movable mold core 3.

[0044] In this embodiment, the demoulding mechanism includes a plurality of demoulding shafts 8 and a second driver 9 that drives the demoulding shafts 8 to rotate. Figure 7 As shown, the demoulding mechanism specifically includes eight demoulding shafts 8; one end of each demoulding shaft 8 is connected to the second driver 9, and the connection here can be a direct connection or an indirect drive connection; the other end of the demoulding shaft 8 is linked with the end of the worm 100, and the linked cooperation here means that the end of the worm 100 close to one end of the demoulding shaft 8 is provided with a corresponding matching hole 100.1 during molding, as shown in FIG. Figure 1 As shown, for example, a cross slot, a polygonal socket, etc.; accordingly, a corresponding plug-in column is provided at one end of the demoulding shaft 8 close to the worm 100, that is, the plug-in column cooperates with the cross slot or the polygonal socket to realize that when the demoulding shaft 8 rotates, the worm 100 is driven to rotate synchronously. Simply put, the linkage cooperation between the demoulding shaft 8 and the end face of the worm 100 can be simply understood as the cooperation between a screwdriver and a screw hole.

[0045] A demoulding hole 2.3 is provided on the static mold base 2 at a position corresponding to the demoulding mechanism for the worm 100 to pass through. When the mold is closed, the second driver 9 drives the demoulding shaft 8 to rotate, thereby driving the worm 100 to rotate, so that the worm 100 can pass through the demoulding hole 2.3 after being separated from the insert 6. In this embodiment, Figure 3 As shown, a guide slot 2.2 is provided at the end of the static mold base 2 facing away from the static mold core 4, and the guide slot 2.2 extends to the side of the static mold base 2; a demolding hole 2.3 is connected to the guide slot 2.2. Thus, when the mold is closed, the second driver 9 rotates the demolding shaft 8, driving the worm 100 to rotate and demold from the threaded hole 6.1 in the insert 6. After demolding, the worm 100 passes through the demolding hole 2.3 and enters the guide slot 2.2. In actual use, the side of the static mold base 2 facing away from the dynamic mold base 1 is also connected to a corresponding base plate 14. After installation, the base plate 14 covers the guide slot 2.2 on the static mold base 2, leaving only an opening 15 extending to one side of the static mold base 2 side wall. This opening 15 is positioned downward. Therefore, the worm 100 can be automatically collected by simply placing a collection box or a collection belt below the opening 15 on the side wall of the static mold base 2.

[0046] like Figure 7 As shown, a fixed block 10 is provided on the movable mold core 3, and multiple demoulding shafts 8 are rotatably engaged on the fixed block 10; a driven gear 8.1 is provided on the demoulding shaft 8, and a driving shaft 11 is rotatably provided on the fixed block 10, and one end of the driving shaft 11 is provided with a first gear 11.1 meshing with each driven gear 8.1, and the other end of the driving shaft 11 is provided with a second gear 11.2, and the outside of the second gear 11.2 is equipped with a transmission chain 12, and the other end of the transmission chain 12 is engaged with the output shaft of the second driver 9. That is, when the mold is closed, the transmission chain 12 is driven by the second driver 9 to rotate, and the transmission chain 12 drives the second gear 11.2 on the driving shaft 11 to rotate, thereby realizing the rotation of the driving shaft 11. As the driving shaft 11 rotates, the first gear 11.1 rotates synchronously, driving the driven gear 8.1 to drive the demoulding shaft 8 to rotate. Under the linkage effect of the matching hole 100.1 at the end of the demoulding shaft 8 and the end of the worm 100, the worm 100 rotates along the threaded hole 6.1 until it disengages from the threaded hole 6.1 to realize material unloading. Figure 7 As shown, this embodiment specifically includes two sets of drive components, namely, two symmetrically arranged driving shafts 11, and four demolding shafts 8 are arranged around each driving shaft 11; that is, eight worms 100 are formed and eight worms 100 are rotated to demold and unload each time the mold is closed.

[0047] The fixed block 10 is provided with a mounting hole, into which one end of the demolding shaft 8 is axially slidably fitted. An elastic member 13 is sheathed around the exterior of the demolding shaft 8. One end of the elastic member 13 is connected to the fixed block 10, and the other end is connected to the end face of the driven gear 8.1. In this embodiment, the elastic member 13 is preferably a spring. However, in other embodiments, it may be an elastic connector made of other elastic materials, such as a rubber bellows. After the elastic member 13 is added to this structure, the demoulding shaft 8 can be better protruded from the end face of the movable mold core 3. In this way, during the mold closing process, when the movable mold base 1 and the static mold base 2 are not in contact, the outer end of the demoulding shaft 8 has been pre-fitted in the matching hole 100.1 on the end face of the worm 100. As the mold closing continues until the movable mold core 3 and the static mold core 4 are completely fitted, due to the elastic force of the elastic member 13, the end of the demoulding shaft 8 always has a tendency to move toward the worm 100, so as to ensure the stable fit between the demoulding shaft 8 and the worm 100, thereby improving the stability and accuracy of subsequent rotational demoulding.

[0048] In the above mold structure, the first driver is a rotary cylinder, and the second driver is a reduction motor.

[0049] This new injection mold has the following advantages:

[0050] 1. Injection molding and automatic demoulding can be carried out simultaneously, which reduces production time and improves production efficiency;

[0051] 2. The automatic demolding replaces manual demolding and manual placement of inserts, reduces the labor intensity of employees and the risk of mold damage, and stabilizes product quality.

[0052] The above describes the preferred embodiments of the present application, but should not be understood as a limitation on the claims. The present application is not limited to the above embodiments, and the specific structure allows changes. Any changes made within the scope of the independent claims of the present application are within the scope of the present application.

Claims

1. A worm injection mold, comprising a movable mold base (1) and a static mold base (2), wherein the movable mold base (1) is provided with a hot runner system (5), and one end of the movable mold base (1) close to the static mold base (2) is provided with a movable mold core (3) connected to the hot runner system (5); the static mold base (2) is provided with a static mold core (4) matched with the movable mold core (3), characterized in that: The static mold core (4) is provided with two worm molding stations, and the static mold base (2) is provided with a first driver for driving the two worm molding stations to alternately change positions; the movable mold core (3) is provided with an injection molding station and a demoulding mechanism corresponding to the two worm molding stations, and the injection molding station is connected to the hot runner system (5); when the mold is closed for the first time, the injection molding station performs injection molding toward one of the worm molding stations, and when the mold is opened, the first driver drives the two worm molding stations to change positions; when the mold is closed again, the injection molding station performs injection molding toward the other worm molding station, and while the injection molding is being performed, the demoulding mechanism drives the injection molding worm to rotate The demoulding is repeated in this way, and in each mold closing process, the integrated process of worm forming and demoulding is realized; the demoulding mechanism includes a plurality of demoulding shafts (8) and a second driver (9) for driving the demoulding shafts (8) to rotate, one end of the demoulding shafts (8) is connected to the second driver (9), and the other end is linked with the end of the worm (100); a demoulding through hole (2.3) for the worm (100) to pass through is provided at a position corresponding to the demoulding mechanism on the static mold base (2); when the mold is closed, the second driver (9) drives the demoulding shafts (8) to rotate, thereby driving the worm (100) to rotate, so as to separate from the insert (6) and pass through the demoulding through hole (2.3); the static mold base (2) A guide slot (2.2) is further provided at the end away from the static mold core (4), the demoulding through hole (2.3) is connected to the guide slot (2.2), and a bottom plate for covering the guide slot is provided on the side of the static mold base (2) away from the dynamic mold base (1), so that the outer end of the guide slot (2.2) forms an opening (15) for discharging, and the opening (15) is arranged downward; a fixed block (10) is provided on the dynamic mold core (3), and a plurality of demoulding shafts (8) are rotatably fitted on the fixed block (10); a driven gear (8.1) is provided on the demoulding shaft (8), and a driving shaft (11) is rotatably provided on the fixed block (10), and the driving shaft (11) is rotatably provided on the fixed block (10). 1) is provided with a first gear (11.1) meshing with each driven gear (8.1) at one end, a second gear (11.2) is provided at the other end of the driving shaft (11), a transmission chain (12) is provided on the outside of the second gear (11.2), and the other end of the transmission chain (12) is matched with the output shaft of the second driver (9); a mounting hole is provided on the fixed block (10), and one end of the demoulding shaft (8) can be slidably matched in the mounting hole along the axial direction; an elastic member (13) is sleeved on the outside of the demoulding shaft (8), one end of the elastic member (13) is connected to the fixed block (10), and the other end is connected to the end face of the driven gear (8.1).

2. The worm injection mold according to claim 1, characterized in that: The static mold core (4) is symmetrically provided with m component cavities along the circumferential direction, m is an even number greater than or equal to 2, and each of the worm forming stations includes m / 2 component cavities; and the m / 2 component cavities of each worm forming station are arranged sequentially along the circumferential direction or staggered with the m / 2 component cavities of another worm forming station.

3. The worm injection mold according to claim 2, characterized in that: Two groups of forming cavities with an angle of 90° are provided on the static mold core (4) along the circumferential direction, and each group of forming cavities includes a plurality of symmetrically arranged forming holes (4.1).

4. The worm injection mold according to claim 3, characterized in that: A removable insert (6) is provided in the molding hole (4.1), and a threaded through hole (6.1) for molding the external thread of the worm (100) is provided on the insert (6); the injection molding station includes a plurality of core shafts (7) for molding the inner hole of the worm (100), and when the mold is closed, the core shafts (7) are inserted and fitted in the threaded through hole (6.1).

5. The worm injection mold according to any one of claims 1 to 4, characterized in that: An accommodating cavity (2.1) is provided at one end of the static mold base (2) close to the dynamic mold base (1), and the static mold core (4) is circumferentially rotatable in the accommodating cavity (2.1); the first driver drives the static mold core (4) to rotate forward and backward to achieve alternating positions of the two worm forming stations.

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