CN218857569U - Core assembly for producing product with internal threads, injection mold and injection molding equipment - Google Patents

Abstract

The utility model belongs to the technical field of injection mold technique and specifically relates to a core subassembly, injection mold and injection moulding equipment for producing take internal thread product. The mold core assembly comprises an outer mold core and an inner mold core, the outer mold core is provided with a first end and a second end, the first end and the second end are oppositely arranged along the axial direction of the outer mold core, the first end is provided with an external thread, and the thread teeth are provided with guide inclined planes; a plurality of buffer grooves are arranged at intervals in the circumferential direction of the outer core, notches of the buffer grooves are positioned at the first end of the outer core, and the buffer grooves extend along the axial direction of the outer core; the inner mold core penetrates through the inner part of the outer mold core, a plurality of raised lines are arranged at intervals in the circumferential direction of the inner mold core, and the raised lines are matched with the buffer grooves; the internal mold core can remove so that the sand grip keeps away from the external screw thread for outer core, and the part that is located between two adjacent dashpots of outer core can be along radial inside elastic deformation taking place when outer core and in-band screw thread product follow axial relative motion to make in-band screw thread product and outer core separation, improved machining efficiency and yields.

Description

Core assembly for producing product with internal threads, injection mold and injection molding equipment

Technical Field

The utility model belongs to the technical field of injection mold technique and specifically relates to a core subassembly, injection mold and injection moulding device for producing take internal thread product.

Background

In the related art, for products with internal threads, a cavity of an injection mold is generally arranged between a fixed mold part and a movable mold part, and the products are released in a rotary demolding mode. The injection mold has a complex structure, long processing period and low yield of products.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a core subassembly, injection mold and injection moulding equipment for producing take internal thread product to alleviate the adoption that exists among the prior art and rotate the drawing of patterns mode and deviate from the product, lead to the technical problem that the cycle length is long and the yields of product is lower.

In view of the above, the present disclosure provides a core assembly for producing a product with an internal thread, comprising an outer core and an inner core, wherein the outer core is tubular, the outer core has a first end and a second end, the first end and the second end are arranged opposite to each other along an axial direction of the outer core, the first end is provided with an external thread, and a thread ridge of the external thread has a guide slope; a plurality of buffer grooves are arranged at intervals in the circumferential direction of the outer core, notches of the buffer grooves are positioned at the first end of the outer core, and the buffer grooves extend along the axial direction of the outer core; the inner core is arranged in the outer core in a penetrating mode, a plurality of raised lines are arranged on the inner core at intervals in the circumferential direction, and the raised lines are matched with the buffer grooves; the inner core can move relative to the outer core to enable the convex strips to be far away from the external threads, and the part of the outer core, which is located between two adjacent buffer grooves, can be elastically deformed inwards in the radial direction of the outer core when the outer core and a product with the internal threads move relatively along the axial direction of the outer core, so that the product with the internal threads is separated from the outer core.

In one embodiment of the present disclosure, a depth of the relief groove is greater than a length of the external thread; and/or the circumferential surface of the raised line is an arc surface, and the diameter of the arc surface is not less than that of the external thread.

In an embodiment of the present disclosure, the outer core includes a first pipe section and a second pipe section, the first pipe section and the second pipe section are integrally formed, the first end is a free end of the first pipe section, the second end is a free end of the second pipe section, an outer diameter of the second pipe section is larger than an outer diameter of the first pipe section, the buffer groove is disposed in the first pipe section, a guide groove is disposed on an inner wall of the second pipe section, and the guide groove is communicated with the buffer groove to allow the protruding strip to slide in the guide groove and the buffer groove.

In one embodiment of the present disclosure, the number of the buffer slots is three.

In one embodiment of the present disclosure, the profile of the thread ridge is triangular or trapezoidal.

In one embodiment of the present disclosure, the width of the buffer groove is not less than twice the thread depth, wherein the thread depth is the distance between the crest and the root of the thread ridge of the external thread.

In one embodiment of the present disclosure, a core assembly for producing a product with an internal thread further includes an upper core, an end of the inner core adjacent to the external thread protruding outside the first end, the upper core being connected to a portion of the inner core protruding outside the first end.

With the above objects in view, the present disclosure also provides an injection mold for producing a product with internal threads, including a cavity plate, a material pushing plate, a first mounting plate, a second mounting plate, and the core assembly for producing a product with internal threads, wherein the external core is mounted on the first mounting plate, and the internal core is mounted on the second mounting plate; the cavity plate is provided with an upper cavity, and the first end of the outer core is positioned in the upper cavity; the material pushing plate is provided with a lower cavity, and the part of the outer core, which is close to the first end, is positioned in the lower cavity; the material pushing plate and the first mounting plate can move towards the direction far away from the second mounting plate so as to drive the outer mold core to move relative to the inner mold core and enable the raised line to be far away from the external thread; the material pushing plate can move towards a direction far away from the first mounting plate so as to enable a product with an internal thread and the external core to move relatively along the axial direction of the external core, wherein the guide inclined plane of the external thread is matched with the inclined plane of the internal thread of the product with the internal thread, so that the part of the external core between two adjacent buffer grooves can be elastically deformed inwards along the radial direction of the external core when the external core and the product with the internal thread move relatively along the axial direction.

In one embodiment of the present disclosure, the injection mold for producing a product with internal threads further comprises a pallet located below the second mounting plate, the internal core being mounted between the second mounting plate and the pallet.

Based on the above purpose, the present disclosure also provides an injection molding apparatus, including the injection mold for producing the product with the internal thread.

The beneficial effect of this disclosure mainly lies in:

the utility model provides a core subassembly for producing take internal thread product, when using, with core unit mount on injection mold, at this moment, the sand grip is located the dashpot, because sand grip and dashpot looks adaptation for the outline of outer core is complete, so that product injection moulding. After injection moulding, the internal screw thread tooth of product has the inclined plane of laminating mutually with the direction inclined plane of external screw thread, it removes interior core for outer core, so that the external screw thread is kept away from to the sand grip, because the notch of dashpot is located the first end of outer core, the axial extension of outer core is followed to the dashpot, make and have the buffering space between each part between two adjacent dashpots, when outer core and interior screw thread product along the axial relative motion of outer core, the direction inclined plane of external screw thread can be extruded on the internal screw thread inclined plane of product, and then the part that drives between two adjacent dashpots of outer core radially inwards takes place elastic deformation along outer core, thereby can conveniently with interior screw thread product and outer core separation, machining efficiency and yields have been improved.

Drawings

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

FIG. 1 is a schematic illustration of a core assembly for producing an internally threaded product according to an embodiment of the present disclosure;

FIG. 2 is a partial enlarged view at B;

FIG. 3 is a schematic illustration of the construction of an outer core in a core package for producing an internally threaded product according to an embodiment of the present disclosure;

FIG. 4 is a front view of an outer core in a core assembly for producing internally threaded products provided by an embodiment of the present disclosure;

FIG. 5 is a cross-sectional view taken along line T-T of FIG. 4;

FIG. 6 is a schematic illustration of a partial structure of an outer core in a core package for producing an internally threaded product according to an embodiment of the present disclosure;

FIG. 7 is a schematic illustration of a configuration of an internal core in a core package for producing an internally threaded product provided by an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of an injection mold for producing an internally threaded product according to an embodiment of the present disclosure;

FIG. 9 is a schematic view of an internal structure of an injection mold for producing an internally threaded product according to an embodiment of the present disclosure;

FIG. 10 is an enlarged view of a portion of FIG. 9 at C;

fig. 11 is a partial enlarged view of fig. 10 at D.

Icon: 1-an outer core; 11-a first end; 12-a second end; 13-external thread; 130-a guide ramp; 131-a first external thread ridge; 132-a second external thread ridge; 133-a third external thread ridge; 101-a first pipe section; 102-a second pipe segment; 14-a buffer tank; 15-a resilient arm; 16-a guide groove; 2-an internal core; 21-convex strips; 3, feeding a mold core; 41-a first internal thread ridge; 42-a second internal thread ridge; 43-inclined plane; 51-a cavity plate; 511-upper cavity; 52-a material pushing plate; 521-a lower cavity; 53-a first mounting plate; 54-a second mounting plate; 55-injection molding cavity; 56-a panel; 57-nozzle; 58-a pallet; 59-an ejector plate; 60-a bottom plate.

Detailed Description

The technical solutions of the present disclosure will be described below clearly and completely with reference to embodiments, and it should be apparent that the described embodiments are some, but not all embodiments of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

In the description of the present disclosure, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, their indicated orientations or positional relationships are based on those shown in the drawings only for the convenience of describing the present disclosure and simplifying the description, but not for indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present disclosure. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present disclosure, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" should be construed broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present disclosure can be understood in specific instances by those of ordinary skill in the art.

Referring to fig. 1 to 11, the present embodiment provides a core assembly for producing a product with an internal thread, including an outer core 1 and an inner core 2, the outer core 1 having a tubular shape, the outer core 1 having a first end 11 and a second end 12, the first end 11 and the second end 12 being disposed opposite to each other in an axial direction of the outer core 1, the first end 11 being provided with an external thread 13, a thread ridge of the external thread 13 having a guide slope 130; a plurality of buffer grooves 14 are arranged at intervals in the circumferential direction of the outer core 1, notches of the buffer grooves 14 are positioned at the first end 11 of the outer core 1, and the buffer grooves 14 extend along the axial direction of the outer core 1; the inner core 2 is arranged in the outer core 1 in a penetrating manner, a plurality of raised strips 21 are arranged at intervals in the circumferential direction of the inner core 2, and the raised strips 21 are matched with the buffer grooves 14; the inner core 2 can move relative to the outer core 1 to make the convex strips 21 far away from the external threads 13, and the part of the outer core 1 between two adjacent buffer grooves 14 can be elastically deformed inward in the radial direction of the outer core 1 when the outer core 1 and the product with the internal thread move relatively in the axial direction to separate the product with the internal thread from the outer core 1.

Based on this structure, the core subassembly that is used for producing the internal thread product that this embodiment provided, when using, with core unit mount on injection mold, at this moment, sand grip 21 is located dashpot 14, because sand grip 21 and dashpot 14 looks adaptation for the outline of outer core 1 is complete, so that product injection moulding. After injection moulding, the internal screw thread of product has the inclined plane 43 of laminating mutually with the direction inclined plane 130 of external screw thread 13, with interior core 2 for outer core 1 removes, so that sand grip 21 keeps away from external screw thread 13, because the notch of dashpot 14 is located the first end 11 of outer core 1, dashpot 14 is along the axial extension of outer core 1, make and have buffer space between each part between two adjacent dashpots 14, when outer core 1 and interior screw thread product along the axial relative motion of outer core 1, the direction inclined plane 130 of external screw thread 13 can be extruded to the internal screw thread inclined plane 43 of product, and then drive the part that is located between two adjacent dashpots 1 of outer core 1 and take place elastic deformation along the radial inside of outer core 1, thereby can conveniently separate interior screw thread product and outer core 1, machining efficiency and yields have been improved.

In one embodiment, the number of buffer slots 14 is three. Accordingly, see FIG. 7. The number of the convex strips 21 is also three.

Referring to fig. 2, 3 and 6, an elastic arm 15 is formed between two adjacent buffer grooves 14, the number of the elastic arms 15 is three, and the elastic arms 15 are a part of the outer core 1. When the outer core 1 and the product with the internal thread move relatively along the axial direction of the outer core 1, the inclined plane 43 of the internal thread of the product can extrude the guide inclined plane 130 of the external thread 13, and further drives the three elastic arms 15 to elastically deform inwards along the radial direction of the outer core 1, so that the product with the internal thread can be separated from the outer core 1 by one thread. Illustratively, referring to fig. 11, the external thread 13 includes a first external thread ridge 131, a second external thread ridge 132, and a third external thread ridge 133, which are arranged in series, and the internal thread of the internally threaded product includes a first internal thread ridge 41 and a second internal thread ridge 42, which are arranged in series, the first internal thread ridge 41 being formed between the first external thread ridge 131 and the second external thread ridge 132, and the second internal thread ridge 42 being formed between the second external thread ridge 132 and the third external thread ridge 133.

In fig. 11, the injection molded product is shown by diagonal hatching, and the contact inclined surface 43 and the guide inclined surface 130 are shown by thick solid lines. When the internally threaded product moves relative to the external core 1 in the axial direction of the external core 1, i.e., the arrow direction a, the inclined surface 43 of the first internal thread 41 adjacent to the first end 11 presses the guide inclined surface 130 of the first external thread 131 in contact therewith, and the inclined surface 43 of the second internal thread 42 adjacent to the first end 11 presses the guide inclined surface 130 of the second external thread 132 in contact therewith, so that the elastic arm 15 is elastically deformed inward in the radial direction of the external core 1, and the first internal thread 41 can smoothly slide over the guide inclined surface 130 in contact therewith and escape from the space between the first external thread 131 and the second external thread 132, that is, the first internal thread 41 is first separated from the external core 1. At the same time, the second internal thread 42 is moved between the first external thread 131 and the second external thread 132, and as the product with internal thread continues to move in the direction of arrow a, the second internal thread 42 can also be separated from the external core 1, and so on, until the entire product is separated from the external core 1. By adopting the mode, the processing period can be shortened, and the yield can be improved. Meanwhile, the inner core does not need to be rotated, and structures such as a motor and a gear transmission assembly do not need to be arranged, so that the complexity and the production cost of the die are reduced.

The number of the buffer grooves 14 may be two or four or more, and accordingly, the number of the elastic arms 15 may be two or four or more.

In one embodiment, see fig. 4, the depth d of the buffer groove 14 is greater than the length L of the external thread 13.

It will be appreciated that the greater the depth d of the buffer reservoir 14, the more easily the resilient arms 15 are elastically deformed. In this embodiment, the depth d of the buffer groove 14 is greater than the length L of the external thread 13, and such a manner can ensure that the deformation amount of the part of the external core 1 provided with the external thread 13, which elastically deforms along the radial direction of the external core 1, is enough to separate the product with the internal thread from the external core 1, so that the resistance is reduced, and the yield is improved.

In one embodiment, referring to fig. 1 and 5, the external core 1 includes a first pipe segment 101 and a second pipe segment 102, the first pipe segment 101 is integrally formed with the second pipe segment 102, the first end 11 is a free end of the first pipe segment 101, the second end 12 is a free end of the second pipe segment 102, an outer diameter of the second pipe segment 102 is larger than an outer diameter of the first pipe segment 101, the buffer slot 14 is disposed in the first pipe segment 101, a guide slot 16 is disposed on an inner wall of the second pipe segment 102, and the guide slot 16 is communicated with the buffer slot 14 to allow the rib 21 to slide in the guide slot 16 and the buffer slot 14.

In the process of mounting the inner core 2 inside the outer core 1, the end of the inner core 2 first enters the inside of the second tube section 102, the ribs 21 slide along the guide grooves 16 until the end of the inner core 2 enters the inside of the first tube section 101, and the ribs 21 slide along the buffer grooves 14 until the inner core 2 is mounted in place. Through setting up first pipeline section 101 and second pipeline section 102 integrated into one piece to set up the guide way 16 that communicates with dashpot 14 at the inner wall of second pipeline section 102, can enough guarantee that inner core 2 slides in outer core 1 is inside, can guarantee again that the root of a plurality of elastic arms 15 all with second pipeline section 102 integrated into one piece, the reconversion of being convenient for.

In one embodiment, the circumferential surface of the ridge 21 is a circular arc surface having a diameter not smaller than the diameter of the external thread 13. The mode can guarantee that an empty groove is formed between two adjacent internal thread sections of an injection-molded product with internal threads, inward protruding parts cannot occur, namely, the parts corresponding to the convex strips 21 are empty grooves, the parts corresponding to the external thread sections are internal thread sections, and the product with the internal threads can be installed on external thread workpieces to be connected.

In one embodiment, the profile of the thread ridge is triangular or trapezoidal. In this way, it can be ensured that the thread ridge of the external thread 13 has the guiding inclined surface 130, and when the external core 1 and the product with the internal thread move relatively in the axial direction of the external core 1, the inclined surface 43 of the internal thread of the product can extrude the guiding inclined surface 130 of the external thread 13, so as to drive the elastic arm 15 to elastically deform inward in the radial direction of the external core 1.

In one embodiment, the width of the buffer groove 14 is not less than twice the thread depth, wherein the thread depth is the distance between the crest and the root of the thread of the external thread 13.

The width of the buffer groove 14 is too large, which easily causes the inner thread of the injection molding to be extremely incomplete, and further may affect the use. The width of the buffer slot 14 is too small, and the adjacent two elastic arms 15 are easily interfered when elastically deformed inward along the radial direction.

Illustratively, in some embodiments, the width of the buffer slots 14 is 0.5 to 1.5mm.

Illustratively, the width of the buffer reservoir 14 may be, but is not limited to, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, or 1.5mm.

It should be noted that the width of the buffer tank 14 can be selected according to the actual product.

In one embodiment, the core assembly for producing an internally threaded product further comprises an upper core 3, one end of the internal core 2 near the external thread protrudes outside the first end 11, and the upper core 3 is connected with a portion of the internal core 2 protruding outside the first end 11.

It will be appreciated that the internally threaded product has at least one cavity, the internal thread being formed in the wall of the cavity. In order to form a cavity with two open ends, and when an internal thread is formed only at one end of the cavity wall, one end of the inner core 2 close to the external thread 13 needs to protrude out of the first end 11, the upper core 3 is connected with the portion of the inner core 2 protruding out of the first end 11, for example, the upper core 3 abuts against the portion of the inner core 2 protruding out of the first end 11, so that after injection molding, a product with an internal thread is a product with two open ends and one internal thread. For example, the product with the internal thread can be a front tip sleeve of a pen, the diameter of one end of the tip sleeve is larger than that of the other end of the tip sleeve, the internal thread is formed at one end with a large diameter and used for being in threaded connection with a pen holder, and the end with a small diameter is used for enabling the pen core to penetrate out.

Referring to fig. 8 to 11, the present embodiment further provides an injection mold for producing a product with internal threads, comprising a cavity plate 51, a material pushing plate 52, a first mounting plate 53, a second mounting plate 54 and the core assembly for producing a product with internal threads provided by the present embodiment, wherein the external core 1 is mounted on the first mounting plate 53, and the internal core 2 is mounted on the second mounting plate 54; the cavity plate 51 is provided with an upper cavity 511, the first end 11 of the outer core 1 being located in the upper cavity 511; the ejector plate 52 is provided with a lower cavity 521, and the part of the outer core 1 close to the first end 11 is positioned in the lower cavity 521; the material pushing plate 52 and the first mounting plate 53 can move towards the direction far away from the second mounting plate 54 to drive the outer core 1 to move relative to the inner core 2 and enable the convex strip 21 to be far away from the external thread; the ejector plate 52 is movable in a direction away from the first mounting plate 53 to move the product with the internal thread relative to the outer core 1 in the axial direction, wherein the guide slope 130 of the external thread cooperates with the slope 43 of the internal thread of the product with the internal thread to allow the portion of the outer core 1 located between adjacent two buffer grooves 14 to be elastically deformed inward in the radial direction of the outer core 1 when the outer core 1 and the product with the internal thread are moved in the axial direction relative to each other.

The injection mold for producing the product with the internal thread provided by the embodiment is used, and the core assembly for producing the product with the internal thread provided by the embodiment is installed on the injection mold when in use, at the moment, the raised line 21 is positioned in the buffer groove 14, and the raised line 21 is matched with the buffer groove 14, so that the outer contour of the outer core 1 is complete, and the product injection molding is facilitated. After the die is assembled, the upper die cavity 511 is opposite to the lower die cavity 521, an injection die cavity 55 is formed in the space between the upper die cavity 511, the outer core 1 and the lower die cavity 521, after materials are injected in the injection die cavity 55, the thread teeth of the internal thread of the formed product are provided with inclined surfaces 43 which are attached to the guide inclined surfaces 130 of the external thread 13, the inner core 2 is moved relative to the outer core 1 to enable the convex strips 21 to be far away from the external thread 13, the notch of the buffer groove 14 is located at the first end 11 of the outer core 1, and the buffer groove 14 extends along the axial direction of the outer core 1, so that a buffer space is formed between each part between every two adjacent buffer grooves 14, when the outer core 1 and a product with the internal thread move relative to each other along the axial direction of the outer core 1, the inclined surfaces 43 of the internal thread of the product can extrude the guide inclined surfaces 130 of the external thread 13, and further drive the part, located between every two adjacent buffer grooves 14, of the outer core 1, to elastically deform inwards along the radial direction of the outer core 1, so that the product with the internal thread can be conveniently separated from the outer core 1, and the processing efficiency and the yield are improved.

Referring to fig. 8 to 10, in one embodiment, the injection mold for producing a product with internal threads further comprises a face plate 56 and a nozzle 57, wherein a glue inlet is formed at the top end of the face plate 56 and used for allowing a material to enter the nozzle 57, and the nozzle 57 is communicated with the bottom of the injection mold cavity 55 and used for feeding the material into the injection mold cavity 55.

The number of the injection molding cavities 55 can be multiple, the number of the nozzles 57 can be multiple, and the nozzles 57 and the injection molding cavities 55 can be in one-to-one correspondence, so that a plurality of products with internal threads can be produced simultaneously, and the production efficiency is improved.

It should be noted that the face plate 56 and the nozzle 57 are prior art and the structure thereof will not be described in detail.

In one embodiment, referring to fig. 8 and 9, the injection mold for producing an internally threaded product further includes a pallet 58, the pallet 58 being located below the second mounting plate 54, and the internal core 2 being mounted between the second mounting plate 54 and the pallet 58.

The carrier plate 58 is capable of carrying the clamping force between the cavity plate 51 and the second mounting plate 54 during clamping.

In one embodiment, referring to fig. 8 and 9, the injection mold for producing a product with internal threads further comprises an ejector plate 59, and the ejector plate 59 is provided with an ejector pin for ejecting the product from the injection mold cavity 55.

Illustratively, when demolding is required, the second mounting plate 54, the supporting plate 58 and the inner core 2 are fixed, the material pushing plate 52 and the first mounting plate 53 move together in a direction away from the second mounting plate 54 for a set distance, so that the outer core 1 moves relative to the inner core 2, the raised line 21 is away from the external thread, then the ejector plate 59 pushes the material pushing plate 52, the material pushing plate 52 gradually pushes the product with the internal thread out of the injection mold cavity 55, and in the pushing process, the inclined plane 43 of the internal thread of the product can extrude the guide inclined plane 130 of the external thread, so as to drive the part of the outer core 1 located between two adjacent buffer grooves 14 to elastically deform along the radial direction of the outer core 1, so that the product with the internal thread can be conveniently separated from the outer core 1, and the processing efficiency and the yield are improved.

In one embodiment, referring to fig. 8 and 9, an injection mold for producing an internally threaded product further comprises a base plate 60, the base plate 60 being located below the ejector plate 59, the base plate 60 and the face plate 56 being adapted to be mounted on an injection molding machine to secure the entire injection mold to the injection molding machine.

It should be noted that the structures and the mutual linkage relationship of the cavity plate 51, the material pushing plate 52, the first mounting plate 53, the second mounting plate 54, the supporting plate 58, the ejector plate 59 and the bottom plate 60 of the injection mold and the working principle of the injection mold are the prior art, and are not described herein again.

The embodiment also provides injection molding equipment, which comprises the injection mold for producing the product with the internal thread provided by the embodiment.

The injection molding equipment that this embodiment provided can improve machining efficiency and yields owing to used the injection mold who is used for producing the internal thread product that this embodiment provided.

In some embodiments, the injection molding apparatus further comprises an injection molding machine on which the injection mold is mounted in use, a supply system for supplying the injection mold cavity 55, and a cooling system for cooling and shaping the material. It should be noted that the injection molding machine, the feeding system and the cooling system are all the prior art, and the structure, the operation principle and the operation process thereof are not described in detail.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present disclosure, and not for limiting the same; while the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand 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; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present disclosure.

Claims (10)

1. A core assembly for producing a product with internal threads, comprising an outer core and an inner core, the outer core being tubular, the outer core having a first end and a second end, the first end being disposed axially opposite the second end along the outer core, the first end being provided with external threads, the threads of the external threads having guide ramps; a plurality of buffer grooves are arranged at intervals in the circumferential direction of the outer core, notches of the buffer grooves are positioned at the first end of the outer core, and the buffer grooves extend along the axial direction of the outer core; the inner core penetrates through the inner part of the outer core, a plurality of raised lines are arranged at intervals in the circumferential direction of the inner core, and the raised lines are matched with the buffer grooves; the inner core can move relative to the outer core to enable the convex strips to be far away from the external threads, and the part of the outer core, which is located between two adjacent buffer grooves, can be elastically deformed inwards in the radial direction of the outer core when the outer core and a product with the internal threads move relatively along the axial direction of the outer core, so that the product with the internal threads is separated from the outer core.

2. The core assembly for producing a product with internal threads of claim 1, wherein the depth of the relief groove is greater than the length of the external threads; and/or the circumferential surface of the raised line is an arc surface, and the diameter of the arc surface is not less than the nominal diameter of the external thread.

3. The core assembly for producing a product with internal threads as claimed in claim 1, wherein the external core comprises a first pipe section and a second pipe section, the first pipe section and the second pipe section are integrally formed, the first end is a free end of the first pipe section, the second end is a free end of the second pipe section, the outer diameter of the second pipe section is larger than that of the first pipe section, the buffer groove is formed in the first pipe section, a guide groove is formed in the inner wall of the second pipe section, and the guide groove is communicated with the buffer groove so that the raised strips can slide in the guide groove and the buffer groove.

4. The core assembly for producing an internally threaded product as claimed in claim 1, wherein the number of the relief grooves is three.

5. The core assembly for producing a product with an internal thread as recited in claim 1, wherein a profile of the thread ridge is triangular or trapezoidal.

6. The core assembly for producing a product with an internal thread according to any one of claims 1 to 5, wherein the width of the buffer groove is not less than twice the thread depth, wherein the thread depth is a distance between a crest and a root of a thread ridge of the external thread.

7. The mandrel assembly for producing an internally threaded product of any of claims 1 to 5 further comprising an upper mandrel, an end of said inner mandrel adjacent said external thread projecting outwardly of said first end, said upper mandrel being connected to a portion of said inner mandrel projecting outwardly of said first end.

8. An injection mold for producing an internally threaded product, comprising a cavity plate, a stripper plate, a first mounting plate, a second mounting plate, and the core assembly of any of claims 1 to 7 for producing an internally threaded product, the external core being mounted to the first mounting plate and the internal core being mounted to the second mounting plate; the cavity plate is provided with an upper cavity, and the first end of the outer core is positioned in the upper cavity; the material pushing plate is provided with a lower cavity, and the part of the outer core, which is close to the first end, is positioned in the lower cavity; the material pushing plate and the first mounting plate can move towards the direction far away from the second mounting plate so as to drive the outer mold core to move relative to the inner mold core and enable the raised line to be far away from the external thread; the material pushing plate can move in the direction far away from the first mounting plate, so that a product with an internal thread and the outer core can move relatively in the axial direction of the outer core, wherein the guide inclined plane of the external thread is matched with the inclined plane of the internal thread of the product with the internal thread, so that the part, located between two adjacent buffer grooves, of the outer core can be elastically deformed inwards in the radial direction of the outer core when the outer core and the product with the internal thread move relatively in the axial direction.

9. The injection mold for producing a product with internal threads of claim 8, further comprising a pallet located below the second mounting plate, the internal core being mounted between the second mounting plate and the pallet.

10. An injection molding apparatus comprising the injection mold for producing an internally threaded product according to claim 8 or 9.

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