Expansion core structure of injection mold

Abstract

The invention discloses an injection mold expansion core structure which comprises an upper stacking mold plate, a lower stacking mold plate and a product, upper mold square irons are arranged on the two sides of the bottom of the upper stacking mold plate, a plate A is arranged at the bottoms of the two sets of upper mold square irons together, upper mold cores are arranged on the two sides of the bottom of the plate A, and a cutter bottom plate is arranged in the middle of the bottom of the upper stacking mold plate. A cutter fixing plate is arranged at the bottom of the cutter bottom plate; through mutual cooperation of the small pressing plate, the spring, the chip expansion piece, the BB sickle piece, the inner production base, the upper mold pressing pair A and the lower mold core, after the mold is improved, when an iron core assembly is placed, the mold core shrinks inwards so that a product can be conveniently placed in, during mold closing, the internal chip expansion piece mechanism moves the chip expansion piece to be attached to the surface of the iron core, and it is guaranteed that when a mold cavity is filled with materials, the product quality is improved. The inner surface of the iron core is clean, the secondary material cleaning procedure is reduced, and the product manufacturing cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, in particular to an expansion core structure of an injection mold. Background Art

[0002] Injection mold is a tool for producing plastic products; it is also a tool that gives plastic products a complete structure and precise size. Injection mold is also a processing method used in mass production of parts, mainly used in the industrial field. The injection mold process is to inject the heated and melted material into the mold cavity by high pressure, and after cooling and solidification, a molded product is obtained. The injection mold core is a key component used in the injection mold. It is usually made of metal material and plays a role of fixing and supporting;

[0003] The existing patent with the authorization announcement number "CN205272481U" discloses an iron core injection mold and an iron core, including: a fixed mold core, on which a fixed mold core cavity is provided; a movable mold core, on which a movable mold core cavity is provided, the movable mold core cavity cooperates with the fixed mold core cavity to form a product cavity, the movable mold core cavity includes a plurality of tooth top cavities for accommodating the tooth tops of a plurality of teeth and a plurality of inclined top cavities respectively arranged on one side of the plurality of tooth top cavities and communicating with the tooth top cavities; and an inclined ejector mechanism, the inclined ejector mechanism includes a plurality of inclined ejector pins, an inclined ejector pin plate and a driving device, the heads of the plurality of inclined ejector pins are respectively arranged in the plurality of inclined ejector pins, and can move between a retracted position and an extended position, and the tails of the plurality of inclined ejector pins are mounted on the inclined ejector pin plate; the driving device is used to drive the inclined ejector pin plate. The iron core injection mold provided by the present invention can reduce labor costs and improve work efficiency; moreover, it can ensure that the product does not have problems such as breakdown caused by poor installation of the plastic frame;

[0004] The above-mentioned existing mold core assembly needs a certain gap to be placed in the mold, which causes a peak inside the gap during injection molding. A secondary cleaning is required later, which adds unnecessary cleaning steps and increases production costs. Summary of the invention

[0005] The object of the present invention is to provide an injection mold expansion core structure to solve the existing problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an injection mold expansion core structure, comprising an upper code template, a lower code template and a product, upper mold square irons are arranged on both sides of the bottom of the upper code template, and the bottoms of two groups of upper mold square irons are jointly provided with an A plate, upper mold cores are arranged on both sides of the bottom of the A plate, a cutter bottom plate is arranged in the middle of the bottom of the upper code template, a cutter fixing plate is arranged at the bottom of the cutter bottom plate, two groups of upper mold pressing pairs B are arranged at the bottom of the cutter fixing plate, and upper mold pressing pairs A are arranged at the tops of the inner sides of the two groups of upper mold cores;

[0007] Lower die square irons are arranged on both sides of the top of the lower code template, and a B plate is commonly arranged on the top of the two groups of lower die square irons, lower die cores are arranged on both sides of the top of the B plate, lower die cores are arranged at the bottom of the inner sides of the two groups of lower die cores, the inner side of the lower die core is sleeved with an inner production base, an expansion core plate is arranged on the top of the outer side of the inner production base, a BB head sickle is arranged on the inner side of the inner production base, a pull rod is arranged at the bottom of the BB head sickle, a lower die ejector bottom plate is arranged in the middle of the top of the lower code template, a lower die ejector fixing plate is arranged on the top of the lower die ejector bottom plate, the cutter bottom plate and the lower die ejector bottom plate are sleeved on the outer side of the pull rod, a small pressure plate is arranged at the bottom of the two groups of pull rods, and a spring is arranged at the bottom of the small pressure plate.

[0008] Preferably, lower mold ejectors extending to the inner side of the lower mold core are arranged on both sides of the inner side of the small pressure plate, and two groups of ejectors extending to the inner side of the upper mold core are arranged on both sides of the bottom of the cutter fixing plate, respectively, for adjusting the air pressure in the mold cavity, controlling the flow speed and flow route of the plastic material, thereby achieving control of the injection molding quality.

[0009] Preferably, guide rods are provided on both sides of the bottom of the upper code template close to the upper mold square iron, and the guide rods are fixedly connected to the upper code template by bolts, and the cutter base plate and the cutter fixing plate are sleeved on the outside of the guide rods for guiding the cutter base plate and the cutter fixing plate.

[0010] Preferably, latches are provided on both sides of the B plate, and sockets matching the latches are provided on the inner side of the BB head sickle and the bottom of both sides of the lower mold core, so as to facilitate the fixation of the BB head sickle and the lower mold core.

[0011] Preferably, a fixing bolt is provided at the top of the inner side of the upper mold pressing pair A, and a threaded hole matched with the fixing bolt is opened at the top of the upper mold core, which can improve the effect of the upper mold pressing pair A.

[0012] Preferably, the diameter of the expansion core sheet is the same as the top of the lower mold core, which can ensure that the surface of the lower mold core is clean.

[0013] Preferably, a slot matching the BB head sickle is provided on the inner side of the upper mold pressing pair A, and the top of the BB head sickle can be inserted into the slot when the mold is closed.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: the expansion core structure of the injection mold cooperates with each other among the small pressure plate, the spring, the expansion core, the BB head sickle, the inner production base, the upper mold pressure pair A and the lower mold core, so that after the mold is improved, when the core assembly is placed, the core shrinks inward to facilitate the placement of the product, and when the mold is closed, the internal expansion core mechanism moves the expansion core to fit the core surface, ensuring that the inner surface of the core is clean when the mold cavity is filled with material, reducing the secondary cleaning process and reducing the product manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front cross-sectional view of the present invention;

[0016] Figure 2 It is a first stereoscopic view of the lower mold core of the present invention;

[0017] Figure 3 This is a second stereoscopic view of the lower mold core of the present invention.

[0018] In the figure: 1. upper code template; 2. upper die square iron; 3. cutter bottom plate; 4. cutter fixing plate; 5. ejector; 6. A plate; 7. upper die core; 8. lower die core; 9. latch; 10. B plate; 11. pull rod; 12. lower die square iron; 13. lower die ejector fixing plate; 14. lower die ejector bottom plate; 15. small pressure plate; 16. spring; 17. lower code template; 18. product; 19. expansion chip; 20. BB head sickle; 21. inner production base; 22. upper die pressing pair A; 23. upper die pressing pair B; 24. lower die core; 25. lower die ejector. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figure 1-3 , the embodiment of the present invention: an injection mold expansion core structure, including an upper code template 1, a lower code template 17 and a product 18, upper mold square irons 2 are arranged on both sides of the bottom of the upper code template 1, and the bottoms of the two groups of upper mold square irons 2 are jointly provided with an A plate 6, and upper mold cores 7 are arranged on both sides of the bottom of the A plate 6. A cutter bottom plate 3 is arranged in the middle of the bottom of the upper code template 1, and a cutter fixing plate 4 is arranged at the bottom of the cutter bottom plate 3. Two groups of upper mold pressing pairs B23 are arranged at the bottom of the cutter fixing plate 4, and upper mold pressing pairs A22 are arranged at the top of the inner side of the two groups of upper mold cores 7;

[0021] Lower die square irons 12 are provided on both sides of the top of the lower code template 17, and a B plate 10 is commonly provided on the top of the two groups of lower die square irons 12. Lower die cores 8 are provided on both sides of the top of the B plate 10, and lower die cores 24 are provided at the bottom of the inner sides of the two groups of lower die cores 8. The inner side of the lower die core 24 is sleeved with an inner production base 21, and an expansion core 19 is provided at the top of the outer side of the inner production base 21. A BB head sickle 20 is provided on the inner side of the inner production base 21, and a pull rod 11 is provided at the bottom of the BB head sickle 20. A lower die ejector bottom plate 14 is provided in the middle of the top of the lower code template 17, and a lower die ejector fixing plate 13 is provided on the top of the lower die ejector bottom plate 14. The cutter bottom plate 3 and the lower die ejector bottom plate 14 are sleeved on the outer side of the pull rod 11, and a small pressure plate 15 is provided at the bottom of the two groups of pull rods 11, and a spring 16 is provided at the bottom of the small pressure plate 15.

[0022] Furthermore, lower mold ejector pins 25 extending to the inner side of the lower mold core 8 are arranged on both sides of the inner side of the small pressure plate 15, and two groups of ejector pins 5 extending to the inner side of the upper mold core 7 are arranged on both sides of the bottom of the cutter fixing plate 4, respectively, for adjusting the air pressure in the mold cavity, controlling the flow speed and flow path of the plastic material, thereby achieving control of the injection molding quality.

[0023] Furthermore, guide rods are provided on both sides of the bottom of the upper code template 1 near the upper mold square iron 2, and the guide rods are fixedly connected to the upper code template 1 by bolts, and the cutter base plate 3 and the cutter fixing plate 4 are sleeved on the outside of the guide rods for guiding the cutter base plate 3 and the cutter fixing plate 4.

[0024] Furthermore, latches 9 are provided on both sides of the B plate 10, and sockets matching the latches 9 are provided on the inner side of the BB head sickle 20 and the bottom of both sides of the lower mold core 24, so as to facilitate the fixation of the BB head sickle 20 and the lower mold core 24.

[0025] Furthermore, a fixing bolt is arranged at the top of the inner side of the upper mold pressing pair A22, and a threaded hole matched with the fixing bolt is opened at the top of the upper mold core 7, which can improve the effect of the upper mold pressing pair A22.

[0026] Furthermore, the diameter of the expansion core 19 is the same as the top of the lower mold core 24, which can ensure that the surface of the lower mold core 24 is clean.

[0027] Furthermore, a slot matching the BB head sickle 20 is provided on the inner side of the upper mold pressing pair A22, and the top of the BB head sickle 20 can be inserted into the slot when the mold is closed.

[0028] Working principle: When the device is closing the mold, the upper mold pressure pair A22 can be engaged with the BB head sickle 20, so that the BB head sickle 20 can push the pull rod 11 to overcome the elastic force of the spring 16 and move downward when closing the mold, driving the expansion core 19 to move downward and fit the surface of the lower mold core 24, so that there is no gap between the iron core and the mold, ensuring that the inner surface of the iron core is clean when the mold cavity is filled with material, reducing the secondary cleaning process and reducing the product manufacturing cost.

[0029] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0030] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. An injection mold expansion core structure, comprising an upper code template (1), a lower code template (17) and a product (18), characterized in that: Upper die square irons (2) are arranged on both sides of the bottom of the upper code template (1), an A plate (6) is commonly arranged at the bottom of the two groups of upper die square irons (2), upper die cores (7) are arranged on both sides of the bottom of the A plate (6), a cutter bottom plate (3) is arranged in the middle of the bottom of the upper code template (1), a cutter fixing plate (4) is arranged at the bottom of the cutter bottom plate (3), two groups of upper die pressing pairs B (23) are arranged at the bottom of the cutter fixing plate (4), and an upper die pressing pair A (22) is arranged at the top of the inner side of the two groups of upper die cores (7); Lower mold square irons (12) are arranged on both sides of the top of the lower code template (17); a B plate (10) is arranged on the top of the two groups of lower mold square irons (12); lower mold cores (8) are arranged on both sides of the top of the B plate (10); lower mold cores (24) are arranged at the bottom of the inner sides of the two groups of lower mold cores (8); an inner production base (21) is sleeved on the inner side of the lower mold core (24); an expansion core (19) is arranged on the top of the outer side of the inner production base (21); and a BB is arranged on the inner side of the inner production base (21). A head sickle (20), a pull rod (11) is arranged at the bottom of the BB head sickle (20), a lower die ejector base plate (14) is arranged in the middle of the top of the lower code template (17), a lower die ejector fixing plate (13) is arranged at the top of the lower die ejector base plate (14), the cutter base plate (3) and the lower die ejector base plate (14) are sleeved on the outside of the pull rod (11), a small pressure plate (15) is arranged at the bottom of the two groups of pull rods (11), and a spring (16) is arranged at the bottom of the small pressure plate (15).

2. The expansion core structure of an injection mold according to claim 1, characterized in that: Lower die ejector pins (25) extending to the inner side of the lower die core (8) are arranged on both sides of the inner side of the small pressing plate (15), and two groups of ejector pins (5) extending to the inner side of the upper die core (7) are arranged on both sides of the bottom of the cutter fixing plate (4).

3. The expansion core structure of an injection mold according to claim 1, characterized in that: Guide rods are arranged on both sides of the bottom of the upper code template (1) close to the upper die square iron (2), and the guide rods are fixedly connected to the upper code template (1) by bolts, and the cutter bottom plate (3) and the cutter fixing plate (4) are sleeved on the outside of the guide rods.

4. The expansion core structure of an injection mold according to claim 1, characterized in that: Pins (9) are arranged on both sides of the B plate (10), and holes matching the pins (9) are provided on the inner side of the BB head sickle (20) and the bottoms of both sides of the lower mold core (24).

5. The expansion core structure of an injection mold according to claim 1, characterized in that: A fixing bolt is arranged at the top of the inner side of the upper die pressing pair A (22), and a threaded hole matching the fixing bolt is opened at the top of the upper die core (7).

6. The expansion core structure of an injection mold according to claim 1, characterized in that: The diameter of the expansion core plate (19) is the same as the top of the lower mold core (24).

7. The expansion core structure of an injection mold according to claim 1, characterized in that: The inner side of the upper mold pressing pair A (22) is provided with a slot adapted to the BB head sickle (20).

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