Injection molding device and injection molding part

Abstract

The utility model belongs to the technical field of battery processing and manufacturing, and discloses an injection molding device and an injection molding part. The injection molding device comprises a mold body and a glue injection channel. An overflow cavity, a drainage cavity and an injection molding cavity which are sequentially communicated and concentrically arranged are formed in the mold body, and a glue inlet is formed in the circle center of the overflow cavity. The glue injection channel is connected to the glue inlet. During injection molding, melt can be fed into the overflow cavity through the glue inlet through the glue injection channel, and then the melt enters the injection molding cavity through the drainage cavity until the injection molding cavity is filled with the melt. After the melt is cooled and shaped, a semi-finished product material is formed, the center of the semi-finished product material is machined to form a mounting hole, finally, the melt is made into an injection molding part, the melt is converged before entering an injection molding cavity, the interior of the injection molding part is free of weld marks, all positions shrink uniformly, and toughness and strength are high. The utility model further provides an injection molding part which is prepared by adopting the injection molding device.

Description

Technical Field

[0001] The utility model relates to the technical field of battery processing and manufacturing, in particular to an injection molding device and an injection molded part. Background Art

[0002] In the prior art, cylindrical batteries are usually provided with an annular insulating gasket, which insulates the poles of the cylindrical battery from the top cover.

[0003] See also Figure 1 Currently, annular insulating gaskets are generally manufactured using an injection molding process. Generally speaking, existing injection molding devices usually have a glue inlet 11' on the side of the annular mold 10', and molten material is injected into the annular mold 10' by side injection. However, after the molten material enters the annular mold 10', two streams of molten material will collide with each other at 0°. After the molten material is completely cooled and formed, a weld mark will form at the location where the two streams of molten material collide with each other. The strength at the weld mark is extremely poor. When the pole of the cylindrical battery is riveted to the rivet block, the weld mark of the annular insulating gasket is prone to cracking, resulting in a high product defect rate. In addition, the reliability of the cylindrical battery assembled using the annular insulating gasket is low. Utility Model Content

[0004] The purpose of the utility model is to provide an injection molding device and an injection molded part, which adopts the center-feeding method to inject molten material into the mold, so that the molten material is evenly diffused from the center to the edge, increasing the collision angle of the molten material, reducing the probability of weld mark formation, improving the toughness and strength of the annular insulating gasket after molding, and not easy to crack after riveting.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] The utility model provides an injection molding device, comprising:

[0007] The mold body includes a first mold part and a second mold part. After the first mold part and the second mold part are spliced together, an overflow cavity, a drainage cavity and an injection cavity are formed therein, which are sequentially connected and concentrically arranged. The drainage cavity is arranged around the circumference of the overflow cavity, and the injection cavity is arranged around the circumference of the drainage cavity. The port of the inner circumferential wall of the injection cavity is no higher than the drainage cavity. A glue inlet is provided at the center of the overflow cavity.

[0008] A glue injection channel is connected to the glue inlet, and the glue injection channel is used to feed molten material into the overflow cavity.

[0009] Optionally, an annular bottom wall and an annular side wall are provided around the glue inlet, and the two ends of the annular side wall are respectively connected to the annular bottom wall and the top wall surface of the overflow cavity, and the plane where the annular bottom wall is located is lower than the top wall surface of the overflow cavity.

[0010] Optionally, the outer diameter of the annular side wall is R, and the value range of R is 2mm-3mm;

[0011] And / or, the height difference between the plane where the annular bottom wall is located and the top wall surface of the overflow chamber is h1, and the value range of h1 is 0.4mm-0.6mm.

[0012] Optionally, an angle α is formed between the annular side wall and the annular bottom wall, and a value range of the angle α is 110°-130°.

[0013] Optionally, the bottom wall of the overflow cavity protrudes in a direction away from the glue inlet to form a draft mold, and an ejector pin position is provided at the center of the draft mold.

[0014] Optionally, the height of the drainage cavity is h2, and the value range of h2 is 0.3mm-0.6mm;

[0015] And / or, the width of the drainage cavity is w, and the value range of w is 0.5mm-1mm.

[0016] Optionally, the injection cavity includes a first annular cavity, a second annular cavity and a third annular cavity that are connected in sequence, the second annular cavity is arranged around the circumference of the first annular cavity, the third annular cavity is arranged around the circumference of the second annular cavity, the first annular cavity is connected to the drainage cavity, the port of the inner circumferential wall of the first annular cavity is not higher than the drainage cavity, the port of the inner circumferential wall of the second annular cavity is not higher than the port of the outer circumferential wall of the first annular cavity, and the port of the inner circumferential wall of the third annular cavity is not higher than the port of the outer circumferential wall of the second annular cavity.

[0017] Optionally, the injection molding device includes a main glue feeding channel, and the glue injection channels and the mold body are both provided with multiple glue injection channels, the glue injection channels and the mold body correspond to each other one by one and are connected to each other, and all the glue injection channels are connected to the main glue feeding channel.

[0018] The utility model also provides an injection molded part, which is prepared by using the injection molding device in any of the above solutions.

[0019] Optionally, a mounting hole is provided at the center of the injection molded part.

[0020] Beneficial effects:

[0021] The utility model provides an injection molding device, comprising a mold body and a glue injection channel. The mold body comprises a first mold part and a second mold part. After the first mold part and the second mold part are spliced together, an overflow chamber, a drainage chamber and an injection chamber are formed in the mold body, which are connected in sequence and arranged concentrically. The port of the inner wall of the injection chamber is not higher than the drainage chamber, and a glue inlet is provided at the center of the overflow chamber. The glue injection channel is connected to the glue inlet, and molten material can be fed into the overflow chamber through the glue injection channel. During injection molding, molten material can be fed into the overflow chamber through the glue inlet through the glue injection channel, and then the molten material enters the injection chamber through the drainage chamber until the injection chamber is filled with the molten material. After the molten material is cooled and shaped, a semi-finished material is formed, and then the first mold part and the second mold part are separated, and the semi-finished material after cooling and forming is taken out. Thereafter, a mounting hole is formed in the center of the semi-finished material by machining, and finally the molten material is made into an injection molded part. Although the mold body of the utility model cannot produce the final product in one step, it can ensure that there is no weld mark inside the injection molded part, the shrinkage is uniform at all positions, the toughness and strength are high, the product quality is good, and the yield rate is high.

[0022] The utility model also provides an injection molded part produced using the aforementioned injection molding device. The mold body of the injection molding device is provided with overflow and drainage grooves to allow the molten material to converge before entering the injection cavity. This significantly improves the weld mark problem of injection molded parts produced using a side-feed molding method, ensures uniform overall strength of the injection molded part, and reduces the risk of cracks under external forces, resulting in high-quality injection molded parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of an injection molding device in the prior art;

[0024] Figure 2 It is a structural schematic diagram of the injection molding device provided in an embodiment of the utility model;

[0025] Figure 3 is a cross-sectional view of an injection molding device provided in an embodiment of the present utility model;

[0026] Figure 4 yes Figure 3 A partial enlarged view of point A in the middle;

[0027] Figure 5 It is a structural schematic diagram of the injection molding device provided in an embodiment of the present invention from another perspective.

[0028] In the picture:

[0029] 10', ring mold; 11, glue inlet;

[0030] 100. Mold body; 110. Overflow cavity; 111. Glue inlet; 112. Annular bottom wall; 113. Annular side wall; 114. Demolding; 120. Drainage cavity; 130. Injection cavity; 131. First annular cavity; 132. Second annular cavity; 133. Third annular cavity; 200. Glue injection channel; 300. Main glue inlet channel. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0032] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0033] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0035] The annular insulating gasket in the prior art is generally Figure 1The annular insulating gasket is typically manufactured using the injection molding device shown in FIG. A glue inlet 11' is typically provided on the side of the annular mold 10'. After injection molding and cooling, the annular insulating gasket is formed. However, the annular insulating gasket produced using this injection molding device has weld marks, which result in poor strength at the weld marks and are prone to cracking during riveting.

[0036] To this end, this embodiment provides a novel injection molding device for producing annular insulating gaskets, which can reduce or avoid weld marks and improve the toughness and strength of the finished annular insulating gaskets. The mold body is configured differently from the conventional annular mold 10', and the processing steps are also slightly different.

[0037] See also Figure 2 、 Figure 3 and Figure 4 This embodiment provides an injection molding device, which includes a mold body 100 and a glue injection channel 200. The mold body 100 includes a first mold part and a second mold part. After the first mold part and the second mold part are spliced together, an overflow chamber 110, a drainage chamber 120 and an injection chamber 130 are formed in the interior thereof, which are connected and concentrically arranged in sequence. The drainage chamber 120 is arranged around the circumference of the overflow chamber 110, and the injection chamber 130 is arranged around the circumference of the drainage chamber 120. The port of the inner wall of the injection chamber 130 is not higher than the drainage chamber 120, and a glue inlet 111 is provided at the center of the overflow chamber 110. The glue injection channel 200 is connected to the glue inlet 111, and the molten material can be fed into the overflow chamber 110 through the glue injection channel 200. Of course, the first mold part and the second mold part can adopt a left-right opening method or a top-down opening method, and this embodiment does not limit this.

[0038] During injection molding, the molten material can be fed into the overflow chamber 110 through the injection port 111 via the injection channel 200. As the molten material is injected, the liquid level of the molten material in the overflow chamber 110 gradually rises until the liquid level of the molten material reaches the drainage chamber 120. The molten material can then enter the injection chamber 130 through the drainage chamber 120 until the injection chamber 130 is filled with the molten material. The mold body 100 and the molten material are then allowed to cool. After the molten material cools and sets, a semi-finished product is formed. The first mold part and the second mold part are then separated, and the cooled and formed semi-finished product is removed. A mounting hole is then machined in the center of the semi-finished product, and the molten material is finally formed into an injection molded part.

[0039] For example, in this embodiment, the melt may be liquid crystal polymer (LCP for short), and the LCP is used to form an injection molded part, namely, the annular insulating gasket required for the production of cylindrical batteries.

[0040] By adopting the injection mold in this embodiment, the molten material is fed into the glue inlet 111 at the center of the overflow cavity 110, and then the molten material diffuses to the surroundings and enters the injection cavity 130 through the drainage cavity 120 at the same time, so that the molten material entering the injection cavity 130 will not directly collide, thereby increasing the collision angle of the molten material and reducing the probability of weld marks forming in the injection cavity 130, thereby improving the toughness and strength of the injection molded part after the injection molding is completed, thereby ensuring the high reliability of the cylindrical battery after assembly.

[0041] Continue to see Figure 4 In this embodiment, the glue inlet 111 is provided with an annular bottom wall 112 and an annular side wall 113 in the circumference. The two ends of the annular side wall 113 are respectively connected to the annular bottom wall 112 and the top wall of the overflow chamber 110. The plane where the annular bottom wall 112 is located is lower than the top wall of the overflow chamber 110. This arrangement is to facilitate the insertion of the glue injection channel 200 into the glue inlet 111 of the mold body 100, and to position it accurately and quickly. Exemplarily, the outer diameter of the annular side wall 113 is R, and the value range of R is 2mm-3mm. For example, the outer diameter R of the annular side wall 113 can be 2mm, 2.5mm or 3mm. The height difference between the plane where the annular bottom wall 112 is located and the top wall of the overflow chamber 110 is h1, and the value range of h1 is 0.4mm-0.6mm. For example, the height difference h1 between the plane where the annular bottom wall 112 is located and the top wall of the overflow chamber 110 can be 0.4mm, 0.5mm or 0.6mm.

[0042] Furthermore, an angle α is defined between the annular sidewall 113 and the annular bottom wall 112. The angle α is in the range of 110° to 130°. For example, the angle α between the annular sidewall 113 and the annular bottom wall 112 can be 110°, 120°, or 130°. By tilting the annular sidewall 113, quick disconnection of the nozzle is facilitated.

[0043] See also Figure 4 and Figure 5 In this embodiment, the bottom wall of the overflow chamber 110 is convex in a direction away from the glue inlet 111 to form a draft pin 114. A pin position (not shown) is provided at the center of the draft pin 114. This arrangement facilitates ejection of the mold body 100 after the glue injection channel 200 has completed injection into the mold body 100. The draft pin 114 also facilitates the removal of the semi-finished product from the mold body 100.

[0044] Continue to see Figure 4In this embodiment, the height of the drainage cavity 120 is h2, and the value range of h2 is 0.3mm-0.6mm. For example, the height h2 of the drainage cavity 120 can be 0.3mm, 0.4mm, 0.5mm or 0.6mm. It should be noted that the value of h2 should not be too small, otherwise the molten material will not easily pass through the drainage cavity 120 into the injection cavity 130. According to the ability of machining the mounting hole, the value of h2 can be increased as much as possible to allow the molten material to pass through the drainage cavity 120 quickly and the fluidity of the molten material is better. Furthermore, the width of the drainage cavity 120 is w, and the value range of w is 0.5mm-1mm. For example, the width w of the drainage cavity 120 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm. By controlling the width w of the drainage cavity 120 within the above range, it is to reserve operating space for machining the mounting hole and avoid affecting the appearance of the finished injection molded part when machining the mounting hole. At the same time, the distance that the molten material passes through the drainage cavity 120 should be minimized to increase the flow rate of the molten material so that the injection cavity 130 can be filled quickly.

[0045] Optionally, based on the shape characteristics of the annular insulating gasket required for the cylindrical battery, the injection cavity 130 in this embodiment is composed of three parts. Specifically, the injection cavity 130 includes a first annular cavity 131, a second annular cavity 132, and a third annular cavity 133 that are connected in sequence. The second annular cavity 132 is arranged around the circumference of the first annular cavity 131, and the third annular cavity 133 is arranged around the circumference of the second annular cavity 132. The first annular cavity 131 is connected to the drainage cavity 120. The port on the inner circumferential wall of the first annular cavity 131 is not higher than the drainage cavity 120, the port on the inner circumferential wall of the second annular cavity 132 is not higher than the port on the outer circumferential wall of the first annular cavity 131, and the port on the inner circumferential wall of the third annular cavity 133 is not higher than the port on the outer circumferential wall of the second annular cavity 132.

[0046] Of course, in other embodiments, the injection cavity 130 may also be made into other shapes according to the desired shape characteristics of the injection molded part, and can be adjusted as needed, which will not be listed here one by one.

[0047] Continue to see Figure 2 and Figure 5 The injection molding device in this embodiment includes a main glue feed channel 300. Multiple glue injection channels 200 and mold bodies 100 are provided. The glue injection channels 200 and mold bodies 100 correspond to each other and are interconnected. All glue injection channels 200 are connected to the main glue feed channel 300. Thus, molten material can be simultaneously injected into multiple mold bodies 100 through the main glue feed channel 300 and multiple glue injection channels 200, thereby simultaneously processing multiple injection molded parts and improving production efficiency.

[0048] For example, in this embodiment, there are four glue injection channels 200 and four mold bodies 100. Of course, in other embodiments, there can also be two, three, five, six, eight, etc. glue injection channels 200 and four mold bodies 100.

[0049] This embodiment also provides an injection molded part produced using the aforementioned injection molding apparatus. The mold body 100 of the injection molding apparatus is provided with overflow and drainage grooves to allow the molten material to converge before entering the injection cavity 130. This significantly improves the weld mark problem found in injection molded parts produced using a side-feed molding method, ensures uniform overall strength of the molded part, and reduces the risk of cracking under external forces, resulting in a high-quality injection molded product.

[0050] The injection molding device provided in this embodiment is particularly suitable for plastic products with a hollow structure in the middle, such as annular insulating gaskets. The annular insulating gasket injection-molded by the mold body 100 of this embodiment will have an additional portion of a round pancake-shaped material body on the inside. This portion of the material body can be processed by external machining or in-mold cutting inside the mold, thereby forming a mounting hole in the center of the annular insulating gasket for the pole to pass through. Although the mold body 100 of the present invention cannot produce the final product in one step, it can ensure that the annular insulating gasket shrinks evenly, improve the toughness and strength of the product, and achieve good product quality and a high yield rate.

[0051] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. An injection molding device, characterized in that: include: A mold body (100) comprises a first mold part and a second mold part, wherein the first mold part and the second mold part are spliced together to form an overflow cavity (110), a drainage cavity (120) and an injection cavity (130) which are sequentially connected and concentrically arranged therein, wherein the drainage cavity (120) is arranged around the circumference of the overflow cavity (110), and the injection cavity (130) is arranged around the circumference of the drainage cavity (120), and the port of the inner peripheral wall of the injection cavity (130) is not higher than the drainage cavity (120), and a glue inlet (111) is provided at the center of the overflow cavity (110); A glue injection channel (200) is connected to the glue inlet (111), and the glue injection channel (200) is used to feed molten material into the overflow cavity (110).

2. The injection molding device according to claim 1, characterized in that The glue inlet (111) is provided with an annular bottom wall (112) and an annular side wall (113) in the circumference thereof, and the two ends of the annular side wall (113) are respectively connected to the annular bottom wall (112) and the top wall surface of the overflow cavity (110), and the plane where the annular bottom wall (112) is located is lower than the top wall surface of the overflow cavity (110).

3. The injection molding device according to claim 2, characterized in that The outer diameter of the annular side wall (113) is R, and the value range of R is 2mm-3mm; And / or, the height difference between the plane where the annular bottom wall (112) is located and the top wall surface of the overflow chamber (110) is h1, and the value range of h1 is 0.4mm-0.6mm.

4. The injection molding device according to claim 2, characterized in that An included angle α is formed between the annular side wall (113) and the annular bottom wall (112), and the value range of the included angle α is 110°-130°.

5. The injection molding device according to claim 1, characterized in that The bottom wall of the overflow cavity (110) is convex in a direction away from the glue inlet (111) to form a draft mold (114), and a pin position is provided at the center of the draft mold (114).

6. The injection molding device according to claim 1, characterized in that The height of the drainage cavity (120) is h2, and the value range of h2 is 0.3mm-0.6mm; And / or, the width of the drainage cavity (120) is w, and the value range of w is 0.5mm-1mm.

7. The injection molding device according to claim 1, characterized in that The injection cavity (130) includes a first annular cavity (131), a second annular cavity (132) and a third annular cavity (133) which are connected in sequence, wherein the second annular cavity (132) is arranged around the circumference of the first annular cavity (131), and the third annular cavity (133) is arranged around the circumference of the second annular cavity (132). The first annular cavity (131) is connected to the drainage cavity (120), the port of the inner peripheral wall of the first annular cavity (131) is not higher than the drainage cavity (120), the port of the inner peripheral wall of the second annular cavity (132) is not higher than the port of the outer peripheral wall of the first annular cavity (131), and the port of the inner peripheral wall of the third annular cavity (133) is not higher than the port of the outer peripheral wall of the second annular cavity (132).

8. The injection molding device according to claim 1, characterized in that The injection molding device comprises a total glue feed channel (300), a plurality of the glue injection channels (200) and the mold body (100) are provided, the glue injection channels (200) and the mold body (100) correspond to each other one by one and are connected to each other, and all the glue injection channels (200) are connected to the total glue feed channel (300).

9. An injection molded part, characterized in that: The invention is prepared by using the injection molding device according to any one of claims 1 to 8.

10. The injection molded part according to claim 9, characterized in that A mounting hole is provided at the center of the injection molded part.

Images