CN214082587U - Injection mould - Google Patents

Abstract

The utility model provides an injection mold, which comprises a first mold, a second mold, a core bar and a core pulling assembly; the first mold and the second mold are oppositely arranged and enclose a mold cavity for injection molding of the injection molding piece, the first end of the core rod is provided with a thread molding section which can extend into the mold cavity, and the second end of the core rod is connected with the core pulling assembly; the core-pulling assembly can drive the core rod to rotate around the axis of the core rod and move towards one side far away from the model cavity, so that the thread forming section of the core rod is separated from the injection molding piece and forms a threaded hole; the injection mold further comprises an elastic piece, the two ends of the elastic piece are connected with the core rod and the first mold, and when the thread forming section of the core rod is separated from the threaded hole of the injection molding piece, the core rod can move towards the side of the mold cavity under the action of the elastic force of the elastic piece. The utility model provides an accessible elastic component drives the core bar during injection mold compound die and resets, simple structure, and the consumption is lower.

Description

Injection mould

Technical Field

The utility model relates to a technical field that moulds plastics especially relates to an injection mold.

Background

Injection molds are used to form thermoplastic or thermoset materials into injection molded parts of various shapes. As injection molding technology advances, the precision of injection molded parts increases, for example, threaded holes can be produced in injection molded parts.

For injection moulding screw hole, injection mold includes the core bar and looses the core subassembly, is equipped with the screw thread shaping section on the core bar to through screw thread shaping section generation screw hole at the in-process of moulding plastics. The core pulling assembly is used for separating the core rod from the injection molding piece when the injection molding piece is demoulded. The core pulling assembly comprises a driving piece, a rack and a gear connected with the core rod, the driving piece is connected with the rack and can drive the rack to reciprocate along the length direction of the rack, the gear is meshed with the rack, and the rack can drive the gear to rotate positively or negatively to drive the core rod to move towards or away from one side of the injection molding piece. For example, after the injection molding piece is molded, the driving piece can drive the gear to rotate forwards through the rack, so that the core rod is separated from the injection molding piece, and the injection molding piece is demoulded. When the next injection molding is carried out, the driving piece can drive the gear to rotate reversely.

Therefore, in the injection molding process of the injection mold, the driving piece needs to rotate forwards and backwards frequently, and the power consumption is large.

SUMMERY OF THE UTILITY MODEL

In view of the above problem, the embodiment of the utility model provides an injection mold, simple structure, the consumption is lower.

In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:

the embodiment of the utility model provides an injection mold, which comprises a first mold, a second mold, a core rod and a core-pulling assembly; the first mold and the second mold are oppositely arranged and enclose a mold cavity for injection molding of the injection molding piece, the first end of the core rod is provided with a thread molding section, the thread molding section can extend into the mold cavity and is used for injection molding of a threaded hole on the injection molding piece, and the second end of the core rod is connected with the core pulling assembly; the core-pulling assembly can drive the core rod to rotate around the axis of the core rod and move towards one side far away from the model cavity, so that the thread forming section of the core rod is separated from the injection molding piece and forms a threaded hole; the injection mold further comprises an elastic piece, the elastic force of the elastic piece faces towards the mold cavity, the two ends of the elastic piece are connected with the core rod and the first mold, and when the thread forming section of the core rod is separated from the threaded hole of the injection molding piece, the core rod can move towards the side of the mold cavity under the action of the elastic force of the elastic piece.

Compared with the prior art, the embodiment of the utility model provides an injection mold has following advantage: the first and second molds may be disposed opposite one another and enclose a mold cavity. At the moment, the thread forming section of the core rod extends into the mold cavity, and after the injection molding piece is formed, internal threads can be formed through the thread forming section. After the injection molding piece is molded, the core rod can be rotated firstly and moved towards one side far away from the mold cavity until the core rod is separated from the mold cavity, and at the moment, the thread molding section of the core rod is separated from the injection molding piece. The first and second molds are then separated to remove the injection molded part and injection molded again. At the moment, the core rod can be pushed to one side of the model cavity through the elastic piece, the core rod does not need to be driven to reset through the reverse rotation of the driving piece, the power consumption is low, and the structure of the injection mold is simple.

In some alternative embodiments, the resilient member is a spring and is compressed between the core rod and the first die.

In some alternative embodiments, the outer diameter of the threaded shaped section of the core pin decreases from a side proximate the second end of the core pin to an end away from the second end of the core pin.

In some optional embodiments, the injection mold further comprises a sliding part connected with the first mold in a sliding manner, the sliding direction of the sliding part is arranged in parallel with the axis of the core rod, and two ends of the elastic part are connected with the core rod and the sliding part; when the first die and the second die are separated, the second die can drive the sliding piece to move towards one side far away from the die cavity and drive the core rod to move so as to separate the core rod from the injection molding piece; when the first die and the second die are close to each other, the second die can drive the sliding piece to move towards one side close to the model cavity and drive the core rod to move, so that the core rod extends into the model cavity.

In some optional embodiments, the sliding part is provided with a first abutting part and a second abutting part at intervals, and the second abutting part is positioned on one side of the first abutting part, which is far away from the model cavity; the core rod is provided with a third abutting part, the third abutting part is positioned between the first abutting part and the second abutting part, and the distance between the first abutting part and the second abutting part along the axial direction of the core rod is larger than the extension length of the third abutting part along the axial direction of the core rod; one of the first abutting part and the second abutting part can abut against the third abutting part to drive the core rod to move.

In some optional embodiments, one end of the elastic member is connected to the core rod, and the other end of the elastic member is connected to the second abutting portion.

In some alternative embodiments, the second mold is provided with a driving part protruding towards the first mold, and the driving part is obliquely arranged towards the side far away from the mold cavity; be equipped with first grafting portion on the slider, when first mould and second mould set up relatively, drive division can stretch into in the first grafting portion.

In some optional embodiments, the core pulling assembly comprises a driving member and a gear transmission assembly, and two ends of the gear transmission assembly are connected with the driving member and the core rod; the gear transmission assembly comprises a first gear, the first gear is coaxially connected with the core rod, and the first gear can drive the core rod to rotate around the axis of the core rod and enable the core rod to move relative to the first gear along the axis of the core rod.

In some alternative embodiments, the first gear is formed with a second insertion portion, and the second end of the core rod is connected with the second insertion portion in an insertion manner.

In some optional embodiments, the number of the core rods is two, and the core rods are arranged in parallel.

In some alternative embodiments, the thread turns of the thread forming segments of both core pins are the same.

In addition to the technical problems solved by the embodiments of the present invention, the technical features constituting the technical solutions, and the advantages brought by the technical features of the technical solutions, further detailed descriptions will be made in specific embodiments for other technical problems that can be solved by the injection mold provided by the embodiments of the present invention, other technical features included in the technical solutions, and advantages brought by the technical features.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an injection mold provided in an embodiment of the present invention;

FIG. 2 is a schematic structural view of portion A of FIG. 1;

FIG. 3 is a schematic structural view of the first mold of FIG. 1;

FIG. 4 is a schematic structural diagram of portion B of FIG. 3;

FIG. 5 is a schematic structural view of the core rod of FIG. 1;

FIG. 6 is a schematic structural view of a threaded land of the core pin of FIG. 5;

FIG. 7 is a schematic view of the first gear of FIG. 1;

FIG. 8 is a first schematic structural view of the slider and the core bar of FIG. 1;

FIG. 9 is a cross-sectional view taken along line C-C of FIG. 8;

FIG. 10 is a second schematic structural view of the sliding member and the core bar of FIG. 1;

fig. 11 is a cross-sectional view taken along line D-D of fig. 10.

Reference numerals:

10: a first mold; 11: a slider; 111: a first butting part; 112: a second butting part; 113: a first insertion part; 11 a: a first connection portion; 11 b: a second connecting portion; 11 c: a third connecting portion; 11 d: a fourth connecting portion;

20: a second mold; 21: a drive section;

30: a core bar; 31: a thread forming section; 32: a third butting part;

41: a drive member; 42: a first gear; 421: a second insertion part; 43: a second gear; 44: an intermediate transmission wheel;

50: an elastic member;

60: and (5) injection molding.

Detailed Description

In order to make the above objects, features and advantages of the embodiments of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

In the prior art, in a molding cycle of injection molding, the driving part needs to rotate forwards and backwards once to realize the extension and retraction of the core rod, and the power consumption of the driving part is high.

In view of this, the embodiment of the present application provides an elastic member, and two ends of the elastic member connect the first mold and the core rod, so that the core rod separated from the injection molded member can move toward one side of the mold cavity under the elastic force of the elastic member. Like this, the injection molding drawing of patterns back, the driving piece can not reverse, but stretches into the model intracavity through the elastic component, and in a molding cycle of injection molding, the driving piece only need carry out once and rotate, has reduced the consumption of moulding plastics, mould.

Fig. 1 is a schematic structural view of an injection mold provided by an embodiment of the present invention. Fig. 2 is a schematic structural view of a portion a in fig. 1. Fig. 3 is a schematic structural view of the first mold shown in fig. 1. Fig. 4 is a schematic structural view of a portion B in fig. 3. Fig. 5 is a schematic structural view of the core rod in fig. 1. FIG. 6 is a schematic view of the threaded land of the core pin of FIG. 5. Fig. 7 is a schematic structural view of the first gear in fig. 1. Fig. 8 is a first schematic structural view of the sliding member and the core bar in fig. 1. Fig. 9 is a cross-sectional view taken along line C-C of fig. 8. Fig. 10 is a second schematic structural view of the sliding member and the core bar in fig. 1. Fig. 11 is a cross-sectional view taken along line D-D of fig. 10.

Referring to fig. 1 to 11, the present embodiment provides an injection mold, which includes a first mold 10, a second mold 20, a core rod 30 and a core pulling assembly; the first mold 10 and the second mold 20 are oppositely arranged and enclose a mold cavity for injection molding of the injection molding part 60, the first end of the core rod 30 is provided with a thread molding section 31, the thread molding section 31 can extend into the mold cavity and is used for injection molding of a threaded hole on the injection molding part 60, and the second end of the core rod 30 is connected with the core pulling component; the core-pulling component can drive the core rod 30 to rotate around the axis of the core rod 30 and move towards one side far away from the mold cavity, so that the thread forming section 31 of the core rod 30 is separated from the injection molding piece 60 and forms a threaded hole; the injection mold further comprises an elastic member 50, the elastic force of the elastic member 50 faces the mold cavity, two ends of the elastic member 50 are connected with the core rod 30 and the first mold 10, and when the thread forming section 31 of the core rod 30 is separated from the threaded hole of the injection mold 60, the core rod 30 can move towards the side of the mold cavity under the elastic force of the elastic member 50.

Specifically, the injection mold comprises a first mold 10 and a second mold 20, and when the first mold 10 and the second mold 20 are fitted, the first mold 10 and the second mold 20 enclose a mold cavity for injection molding the injection molded part 60. The first mold 10 and the second mold 20 may be of a structure known to those skilled in the art, and the embodiment is not limited thereto.

To form the threaded hole in the injection molded part 60, the injection mold further includes a core rod 30 and a core back assembly. The core rod 30 is rod-shaped, one end of the core rod 30 is provided with a thread forming section 31, and the outer wall surface of the thread forming section 31 is provided with threads for forming internal threads through injection molding. The length of the thread forming section 31 may be greater than the depth of the threaded hole.

The injection molding material is cooled and solidified in the mold cavity to obtain an injection molded part 60. Before the first mold 10 and the second mold 20 are separated from each other, the core rod 30 needs to be separated from the injection molded part 60 through a core pulling assembly, that is, core pulling, so as to prevent the core rod 30 from influencing the demolding of the injection molded part 60.

In some optional embodiments, the core pulling assembly comprises a driving member 41 and a gear transmission assembly, wherein two ends of the gear transmission assembly are connected with the driving member 41 and the core rod 30; the gear transmission assembly comprises a first gear 42, the first gear 42 is coaxially connected with the core rod 30, and the first gear 42 can drive the core rod 30 to rotate around the axis of the core rod 30 and enable the core rod 30 to move relative to the first gear 42 along the axis direction of the core rod.

Wherein, the gear drive assembly transmission process is comparatively steady, avoids core bar 30 to loose core the in-process and takes place to rock.

The gear transmission assembly includes a driving member 41, and the driving member 41 may be a motor, for example, the driving member 41 may be a hydraulic motor, and the torque is large, and the gear transmission assembly is not affected by the high temperature of the injection mold and stably and continuously operates.

The gear assembly also includes a first gear 42 that is coaxially coupled to the core rod 30 to rotate the core rod 30. Because the core rod 30 is in threaded connection with the injection molding part 60 through the thread forming section 31, the core rod 30 can be separated from the injection molding part 60 along the axial direction of the core rod in the rotating process according to the thread screwing principle. At this time, the first gear 42 may move simultaneously with the core bar 30, or at this time, the first gear 42 may be fixed relative to the first mold 10 and the core bar 30 may move relative to the first gear 42.

The gear transmission assembly may further comprise a second gear 43 connected to the output shaft of the driving member 41, and the first gear 42 is engaged with the second gear 43 to realize the rotation of the driving member 41 with the first gear 42. Of course, an intermediate transmission wheel 44 may be disposed between the first gear 42 and the second gear 43 to change the transmission ratio of the gear transmission assembly and the rotation direction of the first gear 42 according to requirements, and the size and the number of the intermediate transmission wheels 44 are not limited in this embodiment.

In some alternative embodiments, the first gear 42 has a second insertion portion 421 formed thereon, and the second end of the core rod 30 is connected to the second insertion portion 421 in an insertion manner.

Wherein the second socket 421 may be formed on an end surface of the first gear 42 along its own axis. The second socket part 421 may be a socket protrusion formed on the first gear 42, for example. Optionally, in this embodiment, the second inserting portion 421 penetrates through the first gear 42 along the axial direction of the first gear 42, and the core rod 30 is inserted into the first gear 42, which can also prevent the core rod 30 from being skewed during the moving process, so as to avoid the forming failure of the threaded hole.

In order to enable the first gear 42 to drive the core rod 30 to rotate and enable the core rod 30 to move relative to the first gear 42, the inner wall surface of the second inserting portion 421 may be a non-cylindrical surface, for example, an elliptic cylindrical surface. Optionally, in this embodiment, the inner wall surface of the second socket 421 includes a plane and an arc surface connected to each other, so that the structure is simple and the forming is easy.

That is to say, the loose core assembly can drive the core rod 30 to rotate around its axis, and because the threaded hole threaded connection of core rod 30 and injection molding 60, then, the core rod 30 rotates the in-process, and it can move along its axis direction relative injection molding 60, until screw thread shaping section 31 breaks away from the threaded hole.

After the core pin 30 is separated from the injection molded part 60, the first mold 10 and the second mold 20 can be separated from each other to take out the injection molded part 60, i.e., the injection molded part 60 is demolded. After the injection molded part 60 is taken out, the core rod 30 needs to be moved toward one side of the mold cavity during the process of closing the first mold 10 and the second mold 20, so that the core rod 30 can extend into the mold cavity after the first mold 10 and the second mold 20 are attached.

Accordingly, the embodiment of the present application further includes an elastic member 50, and both ends of the elastic member 50 connect the first mold 10 and the core rod 30. Thus, during the core pulling process of the core rod 30, the elastic member 50 is compressed and deformed and compressed between the core rod 30 and the first mold 10, and accordingly, the core rod 30 is subjected to an elastic force toward the mold cavity side, and the core rod 30 tends to move toward the mold cavity side.

Then, after the core rod 30 is pulled and the injection molded part 60 is taken out, the core rod 30 is extended by the elastic force of the elastic member 50, so as to perform the injection molding of the next cycle. The elastic part 50 is simple in structure, the driving part 41 is not required to rotate again, the structure of the core pulling assembly is simplified, and the power consumption of the injection mold is reduced.

The elastic member 50 may be an elastic cushion block, a metal elastic sheet, or the like, which is easily deformed and has a structure capable of recovering the deformation capability. In some alternative embodiments, the elastic member 50 is a spring and is compressed between the core rod 30 and the first mold 10.

For example, the outer wall surface of the core rod 30 may be provided with a convex spring abutting portion, one end of the spring abuts against the spring abutting portion, and the other end of the spring abuts against the first mold 10. The present embodiment does not limit the arrangement position and fixing form of the elastic member 50.

After the injection molding piece 60 is molded, in the process that the core rod 30 is separated from the injection molding piece 60, the external threads of the thread molding section 31 are screwed with the internal threads in the threaded hole. Referring to fig. 6, in order to reduce the holding force between the core rod 30 and the injection-molded part 60, in some alternative embodiments, the outer diameter of the thread-shaped section 31 of the core rod 30 is gradually reduced from the side near the second end of the core rod 30 to the end away from the second end of the core rod 30, i.e., the thread-shaped section 31 has an inclined demolding angle, so that the core rod 30 can be driven to be separated from the injection-molded part 60 by the driving part 41 with smaller torque, and the loss of the driving part 41 can be reduced.

The demolding angle α of the thread forming section 31 may be smaller than 3 °, and the present embodiment is not limited.

It can be understood that when the driving member 41 drives the thread forming section 31 to be disengaged from the threaded hole, even if the driving member 41 continues to drive the core rod 30 to rotate, the core rod 30 will not continue to translate along its axis, and at this time, the core rod 30 will extend toward the injection molding member 60 under the elastic force of the elastic member 50, and the end of the thread forming section 31 may partially extend into the threaded hole of the injection molding member 60. In order to facilitate demolding of the injection molded part 60 and avoid interference between the core rod 30 and the injection molded part 60, the core rod 30 needs to be moved axially along itself to separate the core rod 30 from the injection molded part 60.

In some alternative embodiments, the injection mold further includes a sliding member 11 slidably connected to the first mold 10, a sliding direction of the sliding member 11 is parallel to an axis of the core rod 30, and two ends of the elastic member 50 connect the core rod 30 and the sliding member 11; when the first mold 10 and the second mold 20 are separated, the second mold 20 can drive the sliding member 11 to move towards the side away from the mold cavity and drive the core rod 30 to move, so that the core rod 30 is separated from the injection molded part 60; when the first die 10 and the second die 20 are close to each other, the second die 20 may move the slide 11 toward a side close to the mold cavity and move the core rod 30 so that the core rod 30 extends into the mold cavity.

Specifically, the relative positional relationship between the core bar 30 and the slider 11 has a first state and a second state.

During the molding process of the injection molded part 60, the sliding part 11 and the first mold 10 are fixed relatively, the core rod 30 extends out relative to the sliding part 11 and into the mold cavity under the elastic force of the elastic part 50, and the core rod 30 and the sliding part 11 are in the first state.

After the injection molding member 60 is molded, the driving member 41 drives the core rod 30 to be disengaged from the threaded hole of the injection molding member 60, so that the thread molding section 31 is disengaged from the threaded hole, at this time, the sliding member 11 and the first mold 10 are relatively fixed, that is, when the core rod 30 contracts relative to the sliding member 11, the elastic member 50 is compressed between the core rod 30 and the elastic member 50, and the core rod 30 and the sliding member 11 are in the second state.

When the thread forming section 31 of the core rod 30 is released from the threaded hole, the first mold 10 and the second mold 20 are separated, at this time, the second mold 20 can drive the sliding member 11 to move towards the side away from the injection molding member 60, and in the moving process of the sliding member 11, the core rod 30 extends out under the elastic force of the elastic member 50 until the relative position relationship between the core rod 30 and the sliding member 11 is restored to the first state. Meanwhile, the sliding part 11 continues to drive the core rod 30 to move towards the side far away from the injection molding part 60 until the core rod 30 is separated from the injection molding part 60, and the core rod 30 does not interfere with demolding of the injection molding part 60. Of course, when the first mold 10 and the second mold 20 are separated, the sliding member 11 may also drive the first gear 42 to move at the same time according to the structure of the first gear 42 and the sliding member 11, and this embodiment is not limited.

It will be appreciated that other hole and groove structures may be provided on the side of the injection molded part 60 where the threaded hole is provided, and the side of the sliding part 11 close to the mold cavity may define the mold cavity together with the first mold 10 and the second mold 20 for injection molding the hole and groove structures. Thus, when the first mold 10 and the second mold 20 are separated, the slide 11 is moved toward the side away from the mold cavity, and the slide 11 can be separated from the injection molded part 60, so that the slide 11 is prevented from interfering with the injection molded part 60.

After the injection molded part 60 is removed, the first mold 10 and the second mold 20 are brought close to each other to perform the injection molding of the next cycle. At this time, the slide 11 moves toward one side of the mold cavity, the elastic member 50 is pushed to move during the movement of the slide 11, and the core rod 30 moves relative to the first mold 10 under the pushing of the elastic member 50 until the slide 11 moves to a position and the core rod 30 extends into the mold cavity.

Wherein, two magnetic members can be respectively arranged on the sliding member 11 and the core bar 30, and the core bar 30 is driven to move by the magnetic force between the two magnetic members.

In some optional embodiments, the sliding member 11 is provided with a first abutting portion 111 and a second abutting portion 112 at an interval, and the second abutting portion 112 is located on a side of the first abutting portion 111 away from the mold cavity; the core rod 30 is provided with a third abutting part 32, the third abutting part 32 is located between the first abutting part 111 and the second abutting part 112, and the distance between the first abutting part 111 and the second abutting part 112 along the axial direction of the core rod 30 is greater than the extension length of the third abutting part 32 along the axial direction of the core rod 30; one of the first abutting portion 111 and the second abutting portion 112 can abut against the third abutting portion 32 to drive the core rod 30 to move.

In the core pulling process of the core rod 30, the core rod 30 moves relative to the sliding member 11, and correspondingly, the distance between the first abutting portion 111 and the second abutting portion 112 is larger than the size of the third abutting portion 32 along the length direction of the core rod 30, so that when the core rod 30 moves relative to the sliding member 11, the third abutting portion 32 can move between the first abutting portion 111 and the second abutting portion 112.

In some alternative embodiments, one end of the elastic member 50 is connected to the core rod 30, and the other end of the elastic member 50 is connected to the second abutting portion 112.

The slider 11 may be spaced apart from the core bar 30 depending on the configuration of the slider 11. In order to stabilize the core rod 30 and prevent the core rod 30 from deflecting along the core pulling process, in this embodiment, the sliding member 11 may be inserted into the core rod 30, the sliding member 11 is provided with an insertion hole, the core rod 30 is inserted into the insertion hole, and the elastic member 50 may be connected to different positions of the core rod 30 according to different structures of the insertion hole.

Specifically, the inner wall surface of the insertion hole may be provided with a clamping groove for accommodating the third abutting portion 32, for example, when the third abutting portion 32 is an annular protrusion, the clamping groove is an annular groove, and the width of the annular groove in the axial direction of the core rod 30 is greater than the size of the annular protrusion in the axial direction of the core rod 30. At this time, two inner wall surfaces of the annular groove in the axial direction of the core bar 30 constitute a first abutting portion 111 and a second abutting portion 112. At this time, the length of the insertion hole along the axial direction of the core rod 30 may be set as required, and the insertion hole may penetrate the slider 11, for example. At this time, the elastic element 50 may be sleeved outside the core rod 30 and compressed between the second abutting portion 112 and the third abutting portion 32.

Of course, the length of the insertion hole may also be smaller than the axial dimension of the sliding member 11 along the core rod 30, i.e. the insertion hole is blind. At this time, a gap may be provided between the core rod 30 and the bottom of the insertion hole to provide a clearance for the core rod 30 during the core pulling process. At this time, the bottom of the insertion hole may form the second abutting portion 112, one end of the elastic member 50 abuts against the end surface of the core rod 30, and the other end of the elastic member 50 abuts against the bottom of the insertion hole. The second abutting portion 112 can push the core rod 30 to move through the elastic member 50.

The sliding member 11 may be an integrally formed structural member, and of course, the sliding member 11 may also be formed by connecting a plurality of parts to meet the requirements of enclosing a mold cavity, connecting with a second mold, and the like. Illustratively, the slider 11 includes a first connecting portion 11a, a second connecting portion 11b, a third connecting portion 11c and a fourth connecting portion 11d fixedly connected in sequence. The first connecting portion 11a is close to one side of the mold cavity, and the first abutting portion 111 may be formed on the first connecting portion 11 a. The first gear 42 is located between the second connecting portion 11b and the third connecting portion 11c, and the second connecting portion 11b can be connected to the second mold 20 to drive the sliding member 11 to move through the second mold 20. The bottom of the insertion hole may be provided on the fourth connection portion 11 d.

Wherein the sliding member 11 can be driven by a driving system to slide, and the injection mold further comprises a driving system of the sliding member 11.

In some alternative embodiments, the second mold 20 is provided with a driving portion 21 protruding toward the first mold 10, and the driving portion 21 is disposed obliquely toward a side away from the mold cavity; the sliding member 11 is provided with a first inserting portion 113, and when the first mold 10 and the second mold 20 are disposed opposite to each other, the driving portion 21 can extend into the first inserting portion 113.

Wherein the first socket part 113 is disposed on the second connecting part 11b, and the driving part 21 may be disposed on a side of the second mold 20 facing the first mold 10 and protrude obliquely downward. Thus, when the second mold 20 and the first mold 10 are separated from each other, the driving portion 21 is disengaged from the first insertion portion 113, at this time, the driving portion 21 abuts against the inner wall surface of the first insertion portion 113, the slider 11 can be moved toward the side away from the injection-molded part 60 by the inclined driving portion 21,

when the first mold 10 and the second mold 20 are close to each other, the driving portion 21 extends into the first insertion portion 113, the driving portion 21 abuts against the inner wall surface of the first insertion portion 113, and the sliding member 11 is driven by the driving portion 21 to move toward the side close to the injection molded part 60.

That is to say, the driving portion 21 and the first inserting portion 113 can be inserted to drive the sliding member 11 to move back and forth, and a driving system of the sliding member 11 is not required to be additionally arranged, so that the structure is simple, and the power consumption is low.

Wherein, the number of the threaded holes of the injection molding 60 is set as required. When the number of the threaded holes is one, the number of the core bar 30 is one. Of course, the number of the threaded holes may be multiple, and multiple threaded holes may be provided on any one of the circumferential side walls of the injection-molded part 60.

In some alternative embodiments, the number of core rods 30 is two and the core rods are arranged in parallel. The number of the corresponding threaded holes of the injection molding member 60 is two, and the embodiment is described by taking the example that the two threaded holes are arranged on the same side of the injection molding member 60.

In this way, the two core rods 30 are arranged next to one another and can be driven jointly by the drive 41. In this case, the number of the first gears 42 is two.

The thread turning directions of the two threaded holes on the injection molding piece 60 can be the same or different. When the screw thread turning directions of the two screw holes are different, the rotation directions of the two first gears 42 during core pulling are also different, and the two first gears 42 can be driven to rotate by different intermediate transmission wheels 44.

In some alternative embodiments, the thread forming sections 31 of the two core pins 30 are threaded in the same direction in this embodiment. At this time, the two first gears 42 can be meshed with the intermediate transmission wheel 44 at the same time, and the structure is simple.

The embodiments or implementation modes in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.

In the description of the present specification, reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example", or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. An injection mold is characterized by comprising a first mold, a second mold, a core rod and a core pulling assembly;

the first mold and the second mold are oppositely arranged and enclose a mold cavity for injection molding of an injection molding piece, a thread molding section is arranged at the first end of the core rod and can extend into the mold cavity for injection molding of a threaded hole in the injection molding piece, and the second end of the core rod is connected with the core pulling assembly; the core pulling assembly can drive the core rod to rotate around the axis of the core rod and move towards one side far away from the model cavity, so that the thread forming section of the core rod is separated from the injection molding piece and forms a threaded hole;

the injection mold further comprises an elastic piece, the elastic force of the elastic piece faces the mold cavity, two ends of the elastic piece are connected with the core rod and the first mold, and when the thread forming section of the core rod is separated from the threaded hole of the injection molding piece, the core rod can move towards the side of the mold cavity under the action of the elastic force of the elastic piece.

2. The injection mold of claim 1, wherein the resilient member is a spring and is compressed between the core pin and the first mold.

3. The injection mold of claim 1, wherein the threaded shaped section of the core rod has an outer diameter that gradually decreases from a side proximate to the second end of the core rod to an end away from the second end of the core rod.

4. An injection mold according to any one of claims 1-3, further comprising a sliding member slidably coupled to the first mold, wherein a sliding direction of the sliding member is parallel to an axis of the core rod, and both ends of the elastic member connect the core rod and the sliding member;

when the first die and the second die are separated, the second die can drive the sliding piece to move towards the side far away from the die cavity and drive the core rod to move so as to separate the core rod from the injection molding piece;

when the first die and the second die are close to each other, the second die can drive the sliding piece to move towards one side close to the model cavity and drive the core rod to move, so that the core rod extends into the model cavity.

5. An injection mold according to claim 4, wherein the sliding member is provided with a first abutting portion and a second abutting portion at intervals, and the second abutting portion is located on one side of the first abutting portion away from the mold cavity;

a third abutting part is arranged on the core rod and is positioned between the first abutting part and the second abutting part, and the distance between the first abutting part and the second abutting part along the axial direction of the core rod is larger than the extension length of the third abutting part along the axial direction of the core rod;

one of the first abutting portion and the second abutting portion can abut against the third abutting portion to drive the core rod to move.

6. An injection mold according to claim 5, wherein one end of the elastic member is connected to the core bar, and the other end of the elastic member is connected to the second abutting portion.

7. An injection mould according to claim 4, characterized in that the second mould is provided with a drive part which is convex towards the first mould, the drive part being arranged obliquely towards the side remote from the mould cavity;

the sliding piece is provided with a first inserting part, and when the first die and the second die are arranged oppositely, the driving part can extend into the first inserting part.

8. An injection mold according to any one of claims 1-3, wherein the core pulling assembly comprises a driving member and a gear transmission assembly, and two ends of the gear transmission assembly are connected with the driving member and the core rod;

the gear transmission assembly comprises a first gear, the first gear is coaxially connected with the core rod, and the first gear can drive the core rod to rotate around the axis of the core rod and enable the core rod to move relative to the first gear along the axis of the core rod.

9. An injection mould as claimed in claim 8, wherein a second socket portion is formed on the first gear, and the second end of the core rod is connected to the second socket portion in a socket manner.

10. An injection mould according to any one of claims 1 to 3, characterised in that the number of core bars is two and arranged side by side.

Images