Gate structure of injection mold and injection mold

Abstract

The application provides a gate structure of an injection mold and the injection mold. The gate structure of the injection mold comprises a mold body and a gate insert. The mold body is provided with a product cavity. The product cavity is provided with a liquid inlet at one end along a first horizontal direction. The gate insert is arranged at one end of the product cavity close to the liquid inlet. A gate channel is formed in the gate insert. The liquid outlet of the gate channel is connected with the liquid inlet. The molten plastic enters the product cavity from the liquid outlet in the gate channel to form a plastic product. The side of the gate insert facing the product cavity is provided with a protruding part. The protruding part is above the liquid outlet. The outermost end of the protruding part along the outer side of the first horizontal direction is flush with the liquid inlet along the vertical direction. When the product is ejected, the protruding part and the plastic surface at the liquid inlet of the product are contacted and scraped along the vertical direction. The gate residual on the surface of the product at the gate is scraped. The residual protrusion does not affect the subsequent assembly or generates debris, and the product quality is ensured.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and in particular to a gate structure for an injection mold and an injection mold. Background Technology

[0002] In the injection molding process of plastic products (especially plastic connectors with terminals), the gate of the injection mold serves as a crucial channel for molten plastic to enter the cavity, and its structural design and processing precision directly affect the final product quality. Currently, the injection mold gate structures used in the industry for such plastic products are mostly traditional direct gate or side gate designs, with a smooth transition between the gate and the product cavity.

[0003] In actual mass production scenarios, with the accumulation of injection molding cycles, the end face of the gate near the cavity is prone to slight wear due to the continuous high-pressure impact and friction of the molten plastic. This leads to an increase in the fit clearance between the gate and the cavity or a decrease in the flatness of the end face. In this case, after each injection molding, when the molten plastic cools and solidifies in the gate channel, gate residue exceeding design requirements will form on the product surface. The residual gate protrusion will affect the fit of parts during subsequent assembly, and may even cause assembly jamming due to interference. Or, during long-term use, the residual part may fall off and generate debris, affecting the electrical performance of electronic devices or the stability of mechanical structures. Utility Model Content

[0004] The purpose of this application is to provide a gate structure for an injection mold to solve the problem that excessive gate residue is easily formed on the product surface after long-term use and wear of the gate insert in the prior art; in addition, the purpose of this application is also to provide an injection mold including the gate structure of the injection mold.

[0005] To achieve this objective, the following technical solution is adopted in this application:

[0006] This application provides a gate structure for an injection mold, which includes a mold body and a gate insert, wherein:

[0007] The mold body has a product cavity, and a liquid inlet is provided at one end of the product cavity along the first horizontal direction. The gate is provided at the end of the product cavity near the liquid inlet.

[0008] The sprue has a sprue channel, and the outlet of the sprue channel is connected to the inlet. Molten plastic enters the product cavity through the outlet in the sprue channel to form a plastic product. The sprue has a protrusion on the side facing the product cavity. The protrusion is located above the outlet. The outermost end of the outer side of the protrusion along the first horizontal direction is flush with the inlet along the vertical direction.

[0009] Optionally, the protrusion is configured as a boss, and the length of the boss along the second horizontal direction is not less than the length of the liquid outlet along the second horizontal direction.

[0010] Optionally, the boss extends to both ends of the outlet along the second horizontal direction to the outer sides of both ends of the outlet along the second horizontal direction, and the length of the boss extension is consistent on both sides of the outlet.

[0011] Optionally, the outer surface of the protrusion is configured as a plane facing the side of the gate insert toward the product cavity, and the bottom of the protrusion is configured as a plane extending along a second horizontal direction.

[0012] Optionally, the distance between the outer side of the protrusion and the side of the gate insert facing the product cavity is 0.05 mm.

[0013] Optionally, the mold body is provided with a mounting groove for installing a sprue insert. The mounting groove extends vertically and is connected to the end of the product cavity near the liquid inlet. The sprue insert is embedded in the mounting groove, and the outer peripheral surface of the sprue insert is in close contact with the inner wall of the mounting groove.

[0014] Optionally, a first inclined surface is provided at one end of the gating channel near the outlet, the first inclined surface is inclined upward and the top of the first inclined surface is connected to the outlet.

[0015] Optionally, the end of the gating channel near the outlet is also provided with an inclined section, the inclined section is inclined downward and the bottom end of the inclined section is connected to the bottom end of the first inclined surface.

[0016] Optionally, the inner wall of the gating channel can be made curved.

[0017] An injection mold comprising the gate structure of any of the above-mentioned injection molds.

[0018] Compared with the prior art, the gate structure of the injection mold proposed in this application has the following advantages:

[0019] 1) By setting a protrusion on the side of the gate facing the product cavity, located above the outlet and with the outermost end of the outer side vertically flush with the inlet, the protrusion can contact and scrape the plastic surface at the product inlet in a vertical direction when the product is ejected, removing excess gate residue from the product surface at the gate, avoiding residual protrusions from affecting subsequent assembly or generating debris, and ensuring product quality.

[0020] 2) By extending the boss to the outer sides of both ends of the outlet along the second horizontal direction with the same extension length, symmetrical scraping of the product surface on both sides of the outlet is achieved when the product is ejected. This further improves the residual of plastic products around the outlet while avoiding excessive residue on one side and balancing the scraping force to prevent product deformation.

[0021] 3) By setting the outer side of the protrusion to a plane facing the product cavity with the gate inlet, and setting the bottom of the protrusion to a plane extending along the second horizontal direction, a smooth contact and uniform scraping of the protrusion with the surface of the plastic product at the product inlet is achieved when the product is ejected as a whole. This avoids damage to the plastic product or incomplete removal of residues during scraping, ensuring a smooth product surface. At the same time, the planar structure facilitates the processing of the protrusion and reduces manufacturing difficulty.

[0022] 4) By adding a downward-sloping section near the outlet of the gating channel, it is convenient to accumulate potential energy so that the molten plastic can quickly enter the cavity. On the other hand, the inclined top of the inclined section can guide the residual solidified material in the gating channel when the product is ejected, reducing the difficulty of cleaning. At the same time, the protrusion further improves the residue removal effect on the product surface and ensures product quality. Attached Figure Description

[0023] To more clearly illustrate and understand the technical solutions in the embodiments of this application, the accompanying drawings used in the background technology and embodiment descriptions of this application will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this application and these drawings without creative effort.

[0024] Figure 1 This is a three-dimensional structural diagram of the gate structure of the injection mold provided in the embodiments of this application;

[0025] Figure 2 This is a cross-sectional view of the gate structure of the injection mold provided in the embodiment of this application;

[0026] Figure 3 hour Figure 2 Enlarged view of point A in the middle;

[0027] Figure 4 This is a partial three-dimensional structural diagram of the gate insert of the injection mold provided in the embodiment of this application;

[0028] Figure 5 This is a three-dimensional structural diagram of the mold body with the gate structure of the injection mold provided in the embodiment of this application. Detailed Implementation

[0029] To facilitate understanding of this application, a more complete description of the application will be provided below with reference to the accompanying drawings. Preferred embodiments of the application are shown in the drawings. However, the application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application. It should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or there may be an intermediate component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or there may be an intermediate component. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] Please see Figures 1 to 5 As shown in the embodiment of this application, a gate structure for an injection mold includes a mold body 10 and a gate insert 20, wherein:

[0031] The mold body 10 has a product cavity 11, which is located along the first horizontal direction. Figure 1 A liquid inlet 110 is provided at one end of the product cavity 11 (in the X direction), and a gate 20 is provided at the end of the product cavity 11 near the liquid inlet 110.

[0032] The sprue 20 is provided with a sprue channel 21. The outlet 210 of the sprue channel 21 is connected to the inlet 110. Molten plastic enters the product cavity 11 through the outlet 210 in the sprue channel 21 to form a plastic product 30. A protrusion 22 is provided on the side of the sprue 20 facing the product cavity 11. The protrusion 22 is located above the outlet 210. The outermost end of the outer side 220 of the protrusion 22 along the first horizontal direction is flush with the inlet 110 along the vertical direction.

[0033] Specifically, the mold body 10 is the male mold core.

[0034] Specifically, when the plastic product 30 is ejected from the product cavity 11, the protrusion 22 contacts and scrapes the surface of the plastic product 30 at the product inlet 110 in the vertical direction.

[0035] Specifically, the plastic product 30 is provided with metal terminals 40 to improve the structural strength of the plastic product 30 and to facilitate the ejection of the plastic product 30.

[0036] By providing a protrusion 22 on the side of the gate 20 facing the product cavity 11, located above the outlet 210 and with the outermost end of the outer side 220 vertically flush with the inlet 110, the protrusion 22 can contact and scrape the plastic surface at the product inlet 110 in a vertical direction when the product is ejected. This removes excess gate residue from the product surface at the gate, preventing residual protrusions from affecting subsequent assembly or generating debris, and ensuring product quality.

[0037] In one embodiment, the protrusion 22 is configured as a boss, the boss being positioned along the second horizontal direction ( Figure 1 The length of the outlet 210 in the second horizontal direction (in the Y direction) is not less than the length of the outlet 210 in the second horizontal direction.

[0038] Specifically, the first horizontal direction is perpendicular to the second horizontal direction.

[0039] By setting the protrusion 22 as a boss and ensuring that its length along the second horizontal direction is not less than the length of the outlet 210 in that direction, the boss can fully scrape the surface of the gate of the plastic product 30 when the product is ejected, thereby expanding the scraping range and ensuring that all gate residues around the outlet 210 are removed, thus improving the residue removal effect.

[0040] In one embodiment, the boss extends to both ends of the outlet 210 along the second horizontal direction, and the length of the boss extending is consistent on both sides of the outlet 210.

[0041] By extending the bosses at both ends along the second horizontal direction to the outer sides of the outlet 210 with consistent extension lengths, symmetrical scraping of the product surfaces on both sides of the outlet 210 is achieved when the product is ejected. This further improves the removal of gate residues around the outlet 210 on the plastic product 30, while not only avoiding excessive residues on one side, but also balancing the scraping force to prevent product deformation.

[0042] In one embodiment, the outer surface 220 of the protrusion 22 is configured as a plane facing the side of the gate inlet 20 toward the product cavity 11, and the bottom of the protrusion 22 is configured as a plane extending along a second horizontal direction.

[0043] By setting the outer surface 220 of the protrusion 22 to a plane facing the product cavity 11 of the gate inlet 20, and setting the bottom of the protrusion 22 to a plane extending along the second horizontal direction, a smooth contact and uniform scraping of the protrusion 22 with the surface of the plastic product 30 at the product inlet 110 is achieved when the product is ejected as a whole. This avoids damage to the plastic product 30 or incomplete removal of residues during scraping, ensuring a smooth product surface. At the same time, the planar structure facilitates the processing of the protrusion 22 and reduces manufacturing difficulty.

[0044] In one embodiment, the distance between the outer surface 220 of the protrusion 22 and the side of the gate inlet 20 facing the product cavity 11 is 0.05 mm.

[0045] By setting the distance between the outer side 220 of the protrusion 22 and the side of the gate 20 facing the product cavity 11 to 0.05mm, precise scraping gap control between the protrusion 22 and the surface of the plastic product 30 is achieved when the product is ejected. This effectively removes residues without scratching the surface of the plastic product 30, ensuring the product's appearance and structural integrity.

[0046] In one embodiment, the mold body 10 has a mounting groove 12 for mounting the sprue insert 20. The mounting groove 12 extends vertically and is connected to one end of the product cavity 11 near the liquid inlet 110. The sprue insert 20 is embedded in the mounting groove 12, and the outer peripheral surface of the sprue insert 20 is in close contact with the inner wall of the mounting groove 12.

[0047] Specifically, the sprue insert 20 is provided with a protrusion 23 facing the mounting groove 12, and the bottom surface of the mounting groove 12 is provided with a groove 120 that matches the protrusion 23, so as to further ensure the accuracy and stability of the installation of the sprue insert 20.

[0048] By embedding the sprue insert 20 into the mounting groove 12 of the mold body 10 and ensuring that its outer circumferential surface is in close contact with the inner wall of the groove, the position of the protrusion 22 is stabilized when the product is ejected. The direct benefit is to prevent the sprue insert 20 from shifting and causing the scraping position to deviate, ensuring that the protrusion 22 always accurately scrapes the residue at the liquid inlet 110 of the product, and maintaining a stable residue removal effect.

[0049] In one embodiment, a first inclined surface 211 is provided at one end of the gating channel 21 near the outlet 210. The first inclined surface 211 is inclined upward and the top of the first inclined surface 211 is connected to the outlet 210.

[0050] By providing an upwardly inclined first inclined surface 211 near the outlet 210 in the gating channel 21, the flow direction of the plastic during molding is changed, the impact force of the molten plastic entering the cavity is reduced, the wear on the gating inlet 20 and the cavity wall is reduced, and the plastic is prevented from generating eddies due to impact, resulting in air bubbles or uneven filling, thus ensuring the product molding quality.

[0051] In one embodiment, the end of the gating channel 21 near the outlet 210 is also provided with an inclined section 212, the inclined section 212 is inclined downward and the bottom end of the inclined section 212 is connected to the bottom end of the first inclined surface 211.

[0052] Specifically, the top 2120 of the inclined section 212 is connected to the liquid outlet 210.

[0053] By adding a downward-sloping inclined section 212 near the outlet 210 of the gating channel 21, it is convenient to accumulate potential energy so that the molten plastic can quickly enter the cavity. On the other hand, the inclined top 2120 inside the inclined section 212 can guide the residual solidified material in the gating channel 21 when the product is ejected, reducing the cleaning difficulty. At the same time, the protrusion 22 further improves the residue removal effect on the product surface and ensures product quality.

[0054] In one embodiment, the inner wall of the gating channel 21 is configured to be arc-shaped.

[0055] By making the inner wall of the gating channel 21 arc-shaped, the molten plastic can flow smoothly in the gating channel 21, reducing the resistance when the plastic flows and preventing the plastic from lingering and cooling at the corners of the channel to form stubborn residues. At the same time, the arc-shaped structure can disperse the impact and friction of the plastic on the inner wall of the channel, slow down the wear rate of the gating insert 20, extend its service life, and the smooth flow state can reduce the bubbles generated by the plastic due to eddies, thus improving the product molding quality.

[0056] An injection mold comprising the gate structure of any of the above-mentioned injection molds.

[0057] The above embodiments merely illustrate the basic principles and characteristics of this application. This application is not limited to the above examples. Various changes and modifications can be made to this application without departing from the spirit and scope thereof, and all such changes and modifications fall within the scope of this application as claimed. The scope of protection of this application is defined by the appended claims and their equivalents.

Claims

1. A gate structure for an injection mold, characterized in that, The injection mold gate structure includes a mold body and a gate insert, wherein: The mold body is provided with a product cavity, and a liquid inlet is provided at one end of the product cavity along the first horizontal direction. The gate is provided at one end of the product cavity near the liquid inlet. The sprue has a sprue channel, and the outlet of the sprue channel is connected to the inlet. Molten plastic enters the product cavity through the outlet in the sprue channel to form a plastic product. The sprue has a protrusion on the side facing the product cavity. The protrusion is located above the outlet. The outermost end of the protrusion along the first horizontal direction is flush with the inlet along the vertical direction.

2. The gate structure of the injection mold according to claim 1, characterized in that, The protrusion is configured as a boss, and the length of the boss along the second horizontal direction is not less than the length of the liquid outlet along the second horizontal direction.

3. The gate structure of the injection mold according to claim 2, characterized in that, The boss extends from both ends along the second horizontal direction to the outer sides of both ends of the outlet along the second horizontal direction, and the length of the boss extending is consistent on both sides of the outlet.

4. The gate structure of the injection mold according to claim 2, characterized in that, The outer surface of the protrusion is configured as a plane facing the product cavity on the same side as the gate inlet, and the bottom of the protrusion is configured as a plane extending along the second horizontal direction.

5. The gate structure of the injection mold according to claim 4, characterized in that, The distance between the outer side of the protrusion and the side of the gate inlet facing the product cavity is 0.05 mm.

6. The gate structure of the injection mold according to claim 1, characterized in that, The mold body has a mounting groove for installing the sprue insert. The mounting groove extends vertically and is connected to the end of the product cavity near the liquid inlet. The sprue insert is embedded in the mounting groove, and the outer peripheral surface of the sprue insert is in close contact with the inner wall of the mounting groove.

7. The gate structure of the injection mold according to claim 1, characterized in that, The gating channel is provided with a first inclined surface at one end near the outlet, the first inclined surface is inclined upward and the top of the first inclined surface is connected to the outlet.

8. The gate structure of the injection mold according to claim 7, characterized in that, The gating channel is also provided with an inclined section at one end near the outlet, the inclined section is inclined downward and the bottom end of the inclined section is connected to the bottom end of the first inclined surface.

9. The gate structure of the injection mold according to claim 1, characterized in that, The inner wall of the gating channel is curved.

10. An injection mold, characterized in that, The injection mold includes the gate structure of the injection mold as described in any one of claims 1-9.

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