Injection mold with exhaust steel insert

Abstract

The utility model provides an injection mold with an exhaust steel insert, which comprises a front mold core, a rear mold core and a runner, a mold cavity is formed between the front mold core and the rear mold core, the runner penetrates through the front mold core and extends into the mold cavity, the front mold core is provided with a plurality of mounting cavities in the direction far away from the mold cavity, and the mounting cavities are communicated with the mold cavity. The mold comprises a mold cavity, a plurality of mounting cavities are formed in the mold cavity, each mounting cavity is communicated with the interior of the mold cavity, exhaust steel inserts are arranged in each mounting cavity, and the aperture of each exhaust steel insert ranges from 0.01 mm to 0.005 mm, so that the problems of air trapping and obvious weld lines when a product is formed in the mold cavity are solved, the product quality is improved, and the yield is increased.

Description

TECHNICAL FIELD

[0001] The utility model belongs to injection mold field, concretely relates to an injection mold with exhaust steel insert piece. BACKGROUND

[0002] Injection mold is a kind of tool for producing plastic product, and is also the tool for giving plastic product complete structure and accurate size, and injection molding is a kind of processing method for batch producing some complex-shaped parts, specifically refers to the high-pressure injection of heated and melted plastic into mold cavity by injection molding machine, and after cooling and solidification, the shaped product is obtained, the structure of mold can be changed in a myriad of ways due to different plastic varieties and properties, plastic product shapes and structures and injection machine types, but the basic structure is consistent, and the mold is mainly composed of pouring system, temperature regulating system, forming parts and structural parts.Injection mold in prior art generally does not have exhaust function, and then when injection molding, it can cause gas trapping in mold cavity, product weld line is obvious and other problems. CONTENT OF UTILITY MODEL

[0003] (1) technical problem to be solved

[0004] The utility model provides an injection mold with exhaust steel insert piece, aims at solving the problems of gas trapping in mold cavity and obvious product weld line when injection molding.

[0005] (2) technical scheme

[0006] The utility model provides an injection mold with exhaust steel insert piece, including mold main part, the mold main part includes front mould core, rear mould core and flow channel, the front mould core with the rear mould core between form has the mold cavity, the flow channel passes through the front mould core and extends to the mold cavity, the front mould core is equipped with a plurality of installation cavities to the direction away from the mold cavity, each installation cavity with the mold cavity is connected, each installation cavity all is provided with exhaust steel insert piece, the range of the aperture of each exhaust steel insert piece all is in 0.01mm ~ 0.005mm.

[0007] Preferably, the front mould core is provided with a plurality of openings on the side away from the rear mould core, each opening is in communication with each installation cavity, and the exhaust steel insert piece is installed in the corresponding installation cavity through the corresponding opening.

[0008] Preferably, the width of one end of the installation cavity connected with the mold cavity is smaller than the width of the other end, and the shape of the exhaust steel insert piece corresponds to the shape in the installation cavity.

[0009] Preferably, the exhaust steel insert piece is recessed with a forming groove at the connection with the mold cavity.

[0010] Preferably, the diameter of each of the exhaust steel inserts is in the range of 0.0075mm to 0.005mm.

[0011] Preferably, the diameter of each of the exhaust steel inserts is 0.005mm.

[0012] Preferably, the front mold core is concave in a direction away from the mold cavity and extends with a plurality of claw-shaped grooves, each of the claw-shaped grooves is in communication with the mold cavity, and each of the claw-shaped grooves is in communication with the corresponding installation cavity.

[0013] Preferably, the rear mold core is provided with a protrusion at an end away from the claw-shaped grooves, the protrusion is attached to the front mold core, and the mold cavity surrounds the protrusion on one side to form an annular groove body.

[0014] Preferably, the mold body further comprises a third mold core, the third mold core is fixedly installed with the rear mold core, the third mold core extends into the mold cavity and extends into each of the claw-shaped grooves with a claw part, and an injection cavity is formed between the surface of the claw part and the inner wall of the claw-shaped groove.

[0015] Preferably, the height of the top surface of the claw-shaped groove is higher than the height of the top surface of the annular groove body.

[0016] Compared with the prior art, the beneficial effects of the utility model lie in:

[0017] In use, the plastic is injected into the mold cavity through the flow channel and gradually fills the mold cavity. In this process, the plastic extrudes the air in the mold cavity into the installation cavity and is discharged through the exhaust steel inserts, thereby avoiding the problems of air trapping and obvious fusion lines when the product is formed in the mold cavity, improving the product quality and increasing the yield. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structural schematic view of the utility model.

[0019] Figure 2 It is a sectional view of the utility model.

[0020] Figure 3 It is Figure 2 It is a structural schematic view of A.

[0021] Figure 4 It is a structural schematic view of the front mold core of the utility model.

[0022] Figure 5 It is a structural schematic view of the rear mold core of the utility model.

[0023] Figure 6 It is a sectional view of the mold cavity of the utility model.

[0024] Figure 7The utility model discloses a structure schematic diagram of exhaust steel insert.

[0025] Figure 8 The utility model discloses a structure schematic diagram of rear die.

[0026] Figure 9 The utility model discloses a structure schematic diagram of produced comb part.

[0027] Figure 10 The utility model discloses a structure schematic diagram of produced comb part.

[0028] Reference signs:

[0029] 1 - front die, 10 - mould main part, 11 - installation cavity, 12 - exhaust steel insert, 121 - forming groove, 13 - opening, 14 - claw type groove, 2 - rear die, 20 - comb part, 201 - installation hole, 202 - comb tooth, 203 - main body, 21 - protruding block, 3 - runner, 4 - mould cavity, 41 - annular groove body, 5 - third die, 51 - claw part, 52 - injection cavity. DETAILED DESCRIPTION

[0030] The technical scheme in the utility model embodiment will be clearly and completely described below with reference to the drawings in the utility model embodiments.

[0031] As Figures 1-9 The utility model discloses an injection mould with exhaust steel insert, including mould main part 10, mould main part 10 includes front die 1, rear die 2 and runner 3, and the front die 1 with rear die 2 between formed with mould cavity 4, the runner 3 passes through the front die 1 and extends to the mould cavity 4, the front die 1 is equipped with a plurality of installation cavities 11 to the direction away from the mould cavity 4, each installation cavity 11 with the mould cavity 4 is communicated, and each installation cavity 11 is provided with exhaust steel insert 12, and the aperture range of each exhaust steel insert 12 is all in 0.01mm~0.005mm.

[0032] Further, the front mold core 1 is provided with a plurality of openings 13 on the side away from the rear mold core 2, each of the openings 13 is in communication with each of the installation cavities 11, and the exhaust steel inserts 12 are installed in the corresponding installation cavities 11 through the corresponding openings 13. The installation cavities 11 are gradually reduced in width from one end connected to the mold cavity 4 to the other end, and the shape of the exhaust steel inserts 12 corresponds to the shape of the installation cavities 11. The exhaust steel inserts 12 are concavely provided with forming grooves 121 at the connection with the mold cavity 4. Specifically, the installation cavities 11 are gradually reduced in hole diameter from one end of the openings 13 to one end of the mold cavity 4, so that the inner wall of the installation cavities 11 has an inclination. When the exhaust steel inserts 12 are installed, the exhaust steel inserts 12 are put into the installation cavities 11 through the openings 13, and the exhaust steel inserts 12 are supported by the inner wall of the installation cavities 11. When the exhaust steel inserts 12 are removed, the front mold core 1 and the rear mold core 2 are separated, a tool is used to push the exhaust steel inserts 12 close to one end of the rear mold core 2, and the exhaust steel inserts 12 are pushed out of the openings 13, so that the installation and removal are convenient and the maintenance of the exhaust steel inserts 12 is facilitated. On this basis, the surface of the exhaust steel inserts 12 can be made in a shape consistent with the shape of the inner wall of the installation cavities 11, so that when the exhaust steel inserts 12 are put into the installation cavities 11, the deformation of the exhaust steel inserts 12 caused by the extrusion of the bottom of the exhaust steel inserts 12 and the inner wall of the installation cavities 11 is avoided, and the exhaust effect of the exhaust steel inserts 12 is affected. In addition, when the plastic is injected into the mold cavity 4 through the runner 3, the air in the mold cavity 4 is extruded by the plastic to flow in the direction of the installation cavities 11, and finally discharged through the exhaust steel inserts 12. At the same time, the plastic finally contacts the connection between the exhaust steel inserts 12 and the mold cavity 4. By providing the forming grooves 121 at one end of the exhaust steel inserts 12 connected to the mold cavity 4, the shape of the exhaust steel inserts 12 can be matched with the shape of the mold cavity 4 to form a corresponding shape, so that a better forming effect is achieved.

[0033] Further, the hole diameter of each of the exhaust steel inserts 12 is in the range of 0.0075mm to 0.005mm. Specifically, the larger the hole diameter of the exhaust steel insert 12, the faster the exhaust speed, but it is also easy to cause the flow speed of the plastic in the mold cavity 4 to be too fast, causing the plastic to not completely fill the mold cavity 4, thereby causing some surfaces of the product to not be formed, and even the product to have bubbles. The hole diameter of the exhaust steel insert 12 in the range of 0.01mm to 0.005mm can better avoid the above problems, and the smaller the hole diameter in this range, the better the plastic can completely fill the mold cavity 4. The common venting steel has a hole diameter of 0.01mm to 0.007mm, effectively improving the exhaust efficiency of the mold cavity 4 and solving the gas trapping problem. However, the yield rate of the injection mold provided by the present application using this kind of hole diameter of the venting steel material is lower than that of using a venting steel material with a hole diameter of 0.005mm, so the venting steel with a hole diameter of 0.005mm can better improve the yield rate and ensure the exhaust effect. Because the exhaust steel insert 12 has countless tiny holes for exhaust, the traditional steel cutting method, such as grinding, polishing, and other processes, will produce a lot of fine debris on the surface of the exhaust steel insert 12 during processing, thereby blocking the micro-holes on the surface of the exhaust steel insert 12. Therefore, when the exhaust steel insert 12 is processed, the EDM processing technology is used to cut and form the exhaust steel insert 12, and the electric spark etches the metal debris generated during cutting, avoiding the generation of metal debris during processing.

[0034] Further, the front die core 1 is recessed and extends in the direction away from the mold cavity 4 on one side, and a plurality of claw-shaped grooves 14 are arranged on the recessed surface, each of the claw-shaped grooves 14 is communicated with the mold cavity 4, and the other end of each of the claw-shaped grooves 14 is correspondingly communicated with each of the installation cavities 11. The rear die core 2 is provided with a protrusion 21 at the end away from the claw-shaped grooves 14, the protrusion 21 is combined with the front die core 1, and the side of the mold cavity 4 surrounds the protrusion 21 to form an annular groove body 41. The mold body 10 further comprises a third die core 5, the third die core 5 is fixedly installed with the rear die core 2, the third die core 5 extends into the mold cavity 4, and claw portions 51 are arranged in each of the claw-shaped grooves 14, and the injection cavity 52 is formed between the surface of the claw portion 51 and the inner wall of the claw-shaped groove 14. The height of the top surface of the claw-shaped groove 14 is higher than the height of the top surface of the annular groove. Specifically, the product produced by the utility model is a comb body part 20 of an air outlet of an electric air comb, and when injection molding, the plastic is injected into the mold cavity 4 through the flow channel 3, and the plastic flows to fill the bottom of the mold cavity 4 and extend to the annular groove body 41 and the claw-shaped groove 14 on both sides of the mold cavity 4, so that an installation hole 201 is formed in the annular groove body 41, comb teeth 202 are formed in each of the claw-shaped grooves 14, and a main body 203 is formed in the mold cavity 4, and the installation hole and the comb teeth are communicated. In this process, the plastic pushes the air in the annular groove body 41 to the mold cavity 4, and at the same time, the plastic pushes the air in the mold cavity 4 into each of the claw-shaped grooves 14 together, and the air is discharged through the exhaust steel at the top end of the claw-shaped groove 14, so that the air can be well concentrated and pushed into the claw-shaped groove 14, and the problem of air trapping in the annular groove body 41 and the mold cavity 4 is avoided, the product quality is improved, and the yield is improved. In addition, when the plastic enters the injection cavity 52 in the claw-shaped groove 14, the comb tooth portion forms a hollow structure, the weight of the product is reduced, and the user is more convenient to use.

[0035] The working principle of the utility model is described in detail as follows.

[0036] In use, the plastic is injected into the mold cavity 4 through the flow channel 3, and gradually fills the mold cavity 4. In this process, the plastic is injected into the mold cavity 4 through the flow channel 3, and the plastic flows to fill the bottom of the mold cavity 4 and extend to the annular groove body 41 and the claw-shaped groove 14 on both sides of the mold cavity 4, so that an installation hole 201 is formed in the annular groove body 41, comb teeth 202 are formed in each of the claw-shaped grooves 14, and a main body 203 is formed in the mold cavity 4, and the installation hole and the comb teeth are communicated. In this process, the plastic pushes the air in the annular groove body 41 to the mold cavity 4, and at the same time, the plastic pushes the air in the mold cavity 4 into each of the claw-shaped grooves 14 together, and the air is discharged through the exhaust steel at the top end of the claw-shaped groove 14, so that the problem of air trapping in the product in the mold cavity 4 is avoided, the product quality is improved, and the yield is improved.

[0037] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the present specification is described in this way only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

[0038] It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be considered as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be considered as limiting the claims involved.

Claims

1. An injection mold having an exhaust steel insert (12), characterized in that: The mould body (10) comprises a front mould core (1), a back mould core (2) and a runner (3), a mould cavity (4) is formed between the front mould core (1) and the back mould core (2), the runner (3) extends to the mould cavity (4) through the front mould core (1), the front mould core (1) is provided with a plurality of installation cavities (11) away from the mould cavity (4), each installation cavity (11) is communicated with the mould cavity (4), and each installation cavity (11) is provided with an exhaust steel insert (12).

2. Injection mold with exhaust steel insert (12) according to claim 1, characterized in that: The front mould core (1) is provided with a plurality of openings (13) away from the back mould core (2), each opening (13) is communicated with each installation cavity (11), and the exhaust steel insert (12) is installed in the corresponding installation cavity (11) through the corresponding opening (13).

3. Injection mold with exhaust steel insert (12) according to claim 2, characterized in that: The width of one end of the installation cavity (11) connected with the mould cavity (4) is smaller than that of the other end, and the shape of the exhaust steel insert (12) corresponds to the shape in the installation cavity (11).

4. Injection mold with exhaust steel insert (12) according to claim 2, characterized in that: The exhaust steel insert (12) is provided with a forming groove (121) at the connection with the mould cavity (4).

5. An injection mold having a vented steel insert (12) as defined in claim 1, wherein: The aperture of each exhaust steel insert (12) ranges from 0.0075mm to 0.005mm.

6. Injection mold with exhaust steel insert (12) according to claim 5, characterized in that: The aperture of each exhaust steel insert (12) is 0.005mm.

7. Injection mold with exhaust steel insert (12) according to claim 1, characterized in that: The front mould core (1) is recessed and extends in the direction away from the mould cavity (4) and is provided with a plurality of claw-shaped grooves (14), each claw-shaped groove (14) is communicated with the mould cavity (4), and the other end of each claw-shaped groove (14) is communicated with the corresponding installation cavity (11).

8. Injection mold with exhaust steel insert (12) according to claim 7, characterized in that: The back mould core (2) is provided with a protrusion (21) away from the claw-shaped groove (14), the protrusion (21) is attached to the front mould core (1), and the side of the mould cavity (4) surrounds the protrusion (21) to form an annular groove body (41).

9. Injection mold with exhaust steel insert (12) according to claim 7, characterized in that: The mould body (10) further comprises a third mould core (5), the third mould core (5) is fixedly installed with the back mould core (2), the third mould core (5) extends into the mould cavity (4) and extends into each claw-shaped groove (14) and is provided with a claw part (51), and the surface of the claw part (51) and the inner wall of the claw-shaped groove (14) form an injection cavity (52).

10. Injection mold with exhaust steel insert (12) according to claim 8, characterized in that: The height of the top surface of the claw-shaped groove (14) is higher than that of the top surface of the annular groove body (41).

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