Injection molding insert and injection molding part formed by injection molding insert

Abstract

The utility model relates to the technical field of polymer injection molding processing, and discloses an injection molding insert and an injection molding piece formed by the injection molding insert, the injection molding insert comprises a connecting part and a plurality of groups of clamping jaw parts connected to the connecting part, each clamping jaw part is of a T-shaped structure comprising a first claw-shaped part and a second claw-shaped part, the first claw-shaped part is connected with the connecting part through the second claw-shaped part, a harsh testing environment is provided for the injection molding part through the injection molding insert in a complex shape, the performance difference of the injection molding part in a high and low temperature cycle test is enlarged, and the anti-cracking performance of all polymers can be evaluated conveniently.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of polymer injection molding processing, more particularly to an injection molded insert and an injection molded part formed by the same. BACKGROUND

[0002] Injection molded parts are widely used in various aspects of social life. In order to select appropriate materials and improve the reliability of injection molded parts, it is necessary to test the anti-cracking performance of injection molded parts at different temperatures. The commonly used test method is high-low temperature cycle test. The high temperature test temperature range is usually 80-90℃, and the low temperature test temperature range is usually -40-30℃. The test is repeated 10 times. Whether the injection molded part will crack during the test is observed, and the anti-cracking performance of various polymers is compared. The current test method considers only a single factor, which is to design a structure with a large thickness difference on the polymer injection molded part to generate a large residual internal stress after injection molding. However, this design is still too simple for many actual parts, and the overall test environment is not harsh enough, resulting in that many parts in application scenarios do not crack during high-low temperature cycle test, making it difficult to compare the anti-cracking performance of different materials. SUMMARY

[0003] In order to solve the problem that the test environment is not harsh enough, the injection molded part does not crack during high-low temperature cycle test, and it is difficult to compare the anti-cracking performance, the utility model provides an injection molded insert and an injection molded part formed by the same. The injection molded insert with a complex shape reproduces the harsh thin-walled molding condition, which is more consistent with the actual production scenario and can better reflect the intrinsic performance of the material in resisting high-low temperature cycle cracking. The difference between different materials is magnified, making it easier to select the best polymer material in terms of anti-cracking performance.

[0004] In order to solve the above technical problem, the utility model provides the following technical scheme:

[0005] An injection molded insert, comprising a connecting part and a plurality of sets of clamping jaw parts connected to the connecting part, the clamping jaw part is a T-shaped structure comprising a first claw-shaped part and a second claw-shaped part, the first claw-shaped part is connected to the connecting part through the second claw-shaped part.

[0006] The injection molded insert of the utility model connects multiple sets of clamping jaw parts through the connecting part, the first claw-shaped part and the second claw-shaped part jointly form the T-shaped structure of the clamping jaw part, the clamping jaw part of the T-shaped structure makes the polymer injection molding condition more complex, a plurality of fusion marks with different convergence angles are formed on the first claw-shaped part and the second claw-shaped part, the harsh working condition in the actual injection molding process is reproduced, the requirement for the anti-cracking performance of the material in the high-low temperature cycle test is improved, the polymer material after molding is more likely to crack during the test, and the polymer material can better show significant performance differences in the test.

[0007] Further, one side of the first claw-shaped part away from the second claw-shaped part is arc-shaped. The arc-shaped one side of the first claw-shaped part can simulate the forming condition of the polymer on the arc shape, and compare the cracking of the polymer material on the arc shape in the high-low temperature cycle test.

[0008] Further, the second claw-shaped part is a straight quadrangular prism, and an included angle of the second claw-shaped part and the first claw-shaped part at a connection position in a horizontal projection plane is obtuse. The second claw-shaped part of the straight quadrangular prism is provided with four sharp flange right angles. Defects can be formed at the right angles during polymer forming, and cracking can also occur at the right angles during the high-low temperature cycle cracking process. The included angle of the first claw-shaped part and the second claw-shaped part at the connection position in the horizontal projection plane is controlled to be obtuse, so that the forming condition of the dihedral angle between the two forming surfaces being obtuse can be reproduced. The shape design of the second claw-shaped part can make the polymer forming condition more diversified, and facilitate comparison of the anti-cracking performance of the polymer in the high-low temperature cycle under various forming conditions.

[0009] Further, the connecting part is in a circular arc shape, and a fillet is arranged at a connection position between the connecting part and the second claw-shaped part. The circular arc-shaped connecting part makes the claws arranged on the connecting part not easy to contact each other, avoids affecting the polymer forming, and the included angle between the second claw-shaped part and the connecting part is arranged as a fillet, so that the anti-cracking performance of each material on the fillet structure can be evaluated in the high-low temperature cycle test.

[0010] Further, a positioning protrusion is arranged on the connecting part. The positioning protrusion is used to determine the relative position of the injection molding insert and the injection molding part.

[0011] An injection molding part formed by the injection molding insert, the injection molding part comprising a plurality of groups of first claw-shaped injection molding parts, a plurality of groups of second claw-shaped injection molding parts, a third injection molding part, and an injection molding runner part, the first claw-shaped injection molding part and the third injection molding part being connected with the second claw-shaped injection molding part, and the third injection molding part being connected with the injection molding runner part.

[0012] The injection molding part of the utility model is wholly coated on the surface of the injection molding insert, the polymer flows into the upper end surface of the injection molding insert from the injection molding runner part, and the third injection molding part, the second claw-shaped injection molding part and the first claw-shaped injection molding part are sequentially formed. Under the limitation of the injection molding insert, the injection molding part with a complex shape is formed, the complex forming condition in actual production is reproduced, the material cracking condition is closer to the actual product cracking condition in the subsequent high-low temperature cycle test, and the most suitable polymer material can be selected.

[0013] Furthermore, the side of the first claw-shaped injection part away from the second claw-shaped injection part is arc-shaped. The first claw-shaped injection part with an arc-shaped structure is provided to allow observation of the crack resistance of the injection molded part on the arc-shaped structure during high and low temperature cycling tests, enabling a multi-faceted comparison of the crack resistance performance of the injection molded part.

[0014] Furthermore, the second claw-shaped injection part is a right quadrangular prism, and the angle between the connection between the second claw-shaped injection part and the first claw-shaped injection part on the horizontal projection plane is an obtuse angle; the side wall thickness of the second claw-shaped injection part is 0.8mm to 1.2mm, and the wall thickness of the top and bottom surfaces of each group of second claw-shaped injection parts is different. The right quadrangular prism second claw-shaped injection part has four sharp right angle flanges, which may form defects at the right angles during molding, and may also crack at the right angles during high and low temperature cycle cracking; controlling the angle between the connection between the first claw-shaped injection part and the second claw-shaped injection part on the horizontal projection plane to be an obtuse angle can reproduce the molding situation where the dihedral angle between the two molding surfaces is an obtuse angle. The wall thickness of the second claw-shaped injection section is controlled between 0.8mm and 1.2mm to simulate the molding of thin-walled products in actual production. Injection molded parts with thin walls are more prone to cracking during high and low temperature cycling tests, facilitating the comparison of the crack resistance of various polymer materials under thin-wall conditions and selecting the appropriate polymer material for molding thin-walled injection molded parts. The top and bottom surfaces of the second claw-shaped injection section, which cover different second claw sections, have different thicknesses. This allows for observation of cracking under various wall thickness differences in subsequent tests and enables adjustment of the top and bottom surface thicknesses according to the wall thickness required for actual production, more closely resembling the actual manufactured product.

[0015] Furthermore, the third injection molding portion is arc-shaped, and the connection between the second claw-shaped injection molding portion and the third injection molding portion is rounded. The arc-shaped third injection molding portion makes it difficult for the second claw-shaped injection molding portions disposed on the third injection molding portion to come into contact with each other, thus avoiding affecting the molding of the injection molded part. Setting the included angle between the second claw-shaped injection molding portion and the third injection molding portion as a rounded corner allows for evaluation of the crack resistance performance of the injection molded part on the rounded corner structure during high and low temperature cycling tests.

[0016] Furthermore, the third injection molding part is provided with a positioning hole. The positioning hole cooperates with the positioning protrusion on the mounting insert to complete the accurate positioning of the injection molded part on the injection molding insert.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] This invention takes into account the effects of thin-walled molding and harsh molding conditions, making the performance of the polymer after injection molding more consistent with the actual production conditions. It also imposes stricter requirements on the polymer's resistance to high and low temperature cycle cracking, amplifies the differences between the properties of different materials, reflects the intrinsic properties of the materials, and allows for the selection of more suitable polymer materials. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0020] Figure 1 A schematic diagram of the injection-molded insert provided by this utility model;

[0021] Figure 2 A schematic diagram of an injection molded part made from the injection molding insert provided by this utility model;

[0022] Figure 3 This is a schematic diagram of the molding state of the injection molded part on the injection molded insert provided by this utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Claw portion; 11. First claw-shaped portion; 12. Second claw-shaped portion; 2. Connecting portion; 21. Positioning protrusion; 3. First claw-shaped injection part; 4. Second claw-shaped injection part; 5. Third injection part; 6. Injection flow channel portion; 7. Positioning hole. Detailed Implementation

[0025] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0026] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0027] Example 1

[0028] like Figure 1As shown, the present embodiment is an injection molding insert embodiment, the injection molding insert of the present embodiment comprises a connecting portion 2 and a plurality of sets of jaw portions 1 connected to the connecting portion 2, the jaw portion 1 is a T-shaped structure comprising a first claw-shaped portion 11 and a second claw-shaped portion 12, the first claw-shaped portion 11 is connected to the connecting portion 2 through the second claw-shaped portion 12. The plurality of sets of T-shaped structure jaw portions 1 are connected through the connecting portion 2 and embedded into the polymer during the injection molding process, the first claw-shaped portion 11 and the second claw-shaped portion 12 jointly constitute the T-shaped structure of the jaw portion 1, which makes the polymer molding more complex and the shape more variable. The T-shaped structure of the jaw portion 1 can reproduce many molding conditions in the actual production and processing process, which is close to the harsh molding conditions of actual production. The connecting portion 2 and the plurality of sets of T-shaped structure jaw portions 1 on the injection molding insert can further improve the performance requirements of not cracking in high-low temperature cycle test, amplify the performance difference between various polymer materials, and facilitate the selection of the best polymer material in high-low temperature cycle test.

[0029] The first claw-shaped portion 11 in the present embodiment is arc-shaped on the side away from the second claw-shaped portion 12. The molding condition and anti-cracking performance of the polymer material under linear conditions can be observed on other parts of the jaw portion 1. The arc-shaped structure is provided on the first claw-shaped portion 11 in order to observe the anti-cracking performance of the polymer material on the arc-shaped structure in the high-low temperature cycle test and compare the anti-cracking performance of the material from multiple perspectives.

[0030] The second claw-shaped portion 12 in the present embodiment is a straight quadrangular prism, and the included angle between the second claw-shaped portion 12 and the first claw-shaped portion 11 at the connecting position is an obtuse angle. The straight quadrangular prism-shaped second claw-shaped portion 12 forms a sharp flange right angle on the edge, and the flange right angle is prone to appear a weld mark. Whether the weld mark will crack in the high-low temperature cycle is an important part of the polymer performance test. At the same time, the included angle between the first claw-shaped portion 11 and the second claw-shaped portion 12 is kept as an obtuse angle, which can form weld marks of different angles, facilitate the comparison of the anti-cracking performance of the polymer material under the condition that the dihedral angle is a right angle and the dihedral angle is an obtuse angle, and put forward higher performance requirements for the material that does not crack in the high-low temperature cycle.

[0031] The connecting portion 2 in the present embodiment is in a circular arc shape, and a round corner is provided at the connecting position between the connecting portion 2 and the second claw-shaped portion 12. The connecting portion 2 is in a circular arc shape, and the size of the center angle of the circular arc can be adjusted according to the number and spacing of the set jaw portions 1. The circular arc-shaped connecting portion 2 keeps a suitable gap between the jaw portions 1, does not affect the molding condition, and at the same time improves the space utilization. The connecting portion 2 is provided with a positioning protrusion 21, which is mainly used to fix the relative position between the injection molding insert and the injection molding part.

[0032] Embodiment two

[0033] As Figure 2 shown, the embodiment is an injection molded part, the injection molded part is made of the injection molded insert, the injection molded part includes a plurality of groups of first claw-shaped injection molded parts 3 molded by covering the first claw-shaped part 11, a plurality of groups of second claw-shaped injection molded parts 4 molded by covering the second claw-shaped part 12, a third injection molded part 5 molded by covering the connecting part 2, and an injection molded runner part 6, the second claw-shaped injection molded part 4 is connected between the first claw-shaped injection molded part 3 and the third injection molded part 5, and the third injection molded part 5 is connected with the injection molded runner part 6. During injection molding, the polymer flows from the injection molded runner part 6, and the entire injection molded part is covered outside the injection molded insert. According to the shapes of the first claw-shaped part 11, the second claw-shaped part 12, and the connecting part 2, the first claw-shaped injection molded part 3, the second claw-shaped injection molded part 4, and the third injection molded part 5 with different shapes are formed. Different injection molded parts reproduce the processing conditions and molding conditions that may be encountered in product production. Injection molded parts molded under more severe conditions are more likely to crack during high-low temperature cycle testing, which can magnify the performance differences of each polymer material under harsh molding conditions and accurately evaluate the anti-cracking performance of the material.

[0034] The second claw-shaped injection molded part 4 in the embodiment is a straight quadrangular prism, and the included angle of the connection between the second claw-shaped injection molded part 4 and the first claw-shaped injection molded part 3 on the horizontal projection plane is an obtuse angle. The straight quadrangular prism has four sharp flange right angles on the second claw-shaped injection molded part 4. Defects may be formed at the right angles during molding, and cracking may also occur at the right angles during high-low temperature cycle cracking; controlling the included angle of the connection between the first claw-shaped injection molded part 3 and the second claw-shaped injection molded part 4 on the horizontal projection plane to be an obtuse angle can reproduce the molding condition that the dihedral angle between the two molding surfaces is an obtuse angle, and compare the anti-cracking performance of the injection molded part under this molding condition.

[0035] The side wall thickness of the second claw-shaped injection molded part 4 in the embodiment is 0.8mm-1.2mm. The wall thickness of 0.8mm to 1.2mm belongs to thin-walled material in the field of injection molding. The molding condition of thin-walled material is more severe, the weld mark is dense, and it has a great influence on the cracking performance of the product. It is also more likely to crack during high-low temperature cycle testing, and the anti-cracking performance of each polymer material when producing thin-walled products can be compared.

[0036] The wall thickness of the top surface and the bottom surface of each group of the second claw-shaped injection molding part 4 in this embodiment is different. In actual production, the product may be composed of polymer materials with different wall thicknesses, and the cooling efficiency of polymer materials with different thicknesses is different. Due to the difference in force on both sides, cracking is more likely to occur on the contact surface of materials with different thicknesses. In order to test the cracking of polymer materials under different thickness differences, the top surface and the bottom surface of each group of the second claw-shaped injection molding part 4 are set to different thicknesses, which facilitates adjustment according to the actual wall thickness of the product, and analysis and comparison of the cracking on the contact surface with different thicknesses. The injection molding part in this embodiment is provided with a positioning hole 7 matched with the positioning protrusion 21, and the positioning hole 7 is matched with the positioning protrusion 21 on the injection molding insert, so as to fix the injection molding part on the injection molding insert.

[0037] Embodiment three

[0038] As shown in Figure 3 , this embodiment is similar to embodiment two, except that the side of the first claw-shaped injection molding part 3 away from the second claw-shaped injection molding part 4 in this embodiment is arc-shaped. The first claw-shaped injection molding part 3 with an arc-shaped structure is set to observe the anti-cracking performance of the injection molding part on the arc-shaped structure in the high-low temperature cycle test, and to compare the anti-cracking performance of the injection molding part from multiple angles.

[0039] The third injection molding part 5 in this embodiment is in the shape of a circular arc, and the connection between the second claw-shaped injection molding part 4 and the third injection molding part 5 is provided with a round corner. The third injection molding part 5 in the shape of a circular arc prevents the second claw-shaped injection molding part 4 arranged on the third injection molding part 5 from contacting each other, thereby avoiding affecting the molding of the injection molding part. The angle between the second claw-shaped injection molding part 4 and the third injection molding part 5 is set to a round corner, which can evaluate the anti-cracking performance of the injection molding part on the round corner structure in the high-low temperature cycle test.

[0040] Injection molding products are often produced by high-speed molding method, but high-speed molding requires higher performance of the material in molding and anti-cracking performance under high-low temperature cycle. The injection molding time in this embodiment can be controlled within 0.5S to 1S, the high-speed molded injection part increases the number and sensitivity of weak points prone to cracking, and the performance state of the injection part is kept the same as that in actual production, so that the test results are more accurate.

[0041] In the specific content of the above specific embodiments, any combination of technical features can be made without contradiction. In order to make the description simple, not all possible combinations of the above technical features are described, but as long as the combination of these technical features does not exist contradiction, it should be considered as the scope of the description.

[0042] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and also impossible to exhaust all the implementation modes. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application claims.

Claims

1. An injection molded insert, characterized in that, The connecting part (2) is connected with a plurality of sets of claw parts (1) in T-shaped structure, each of the claw parts (1) comprises a first claw part (11) and a second claw part (12), and the first claw part (11) is connected with the connecting part (2) through the second claw part (12).

2. An injection molded insert according to claim 1, wherein, The first claw part (11) is arc-shaped on the side away from the second claw part (12).

3. An injection molded insert according to claim 1, wherein, The second claw part (12) is a straight quadrangular prism, and the included angle between the second claw part (12) and the first claw part (11) on the horizontal projection plane is obtuse.

4. An injection molded insert as defined in claim 1, wherein, The connecting part (2) is circular arc-shaped, and a round corner is arranged at the connecting position of the connecting part (2) and the second claw part (12).

5. An injection molded insert as defined in claim 1, wherein, A positioning protrusion (21) is arranged on the connecting part (2).

6. An injection molded part obtained by injection insert molding of the injection insert molding composition according to any one of claims 1 to 5, characterized in that, The injection molding part comprises a plurality of sets of first claw-shaped injection molding parts (3), a plurality of sets of second claw-shaped injection molding parts (4), a third injection molding part (5), and an injection molding runner part (6), the second claw-shaped injection molding part (4) is connected between the first claw-shaped injection molding part (3) and the third injection molding part (5), and the third injection molding part (5) is connected with the injection molding runner part (6).

7. An injection molded part according to claim 6, characterized in that The first claw-shaped injection molding part (3) is arc-shaped on the side away from the second claw-shaped injection molding part (4).

8. An injection molded part according to claim 6, characterized in that The second claw-shaped injection molding part (4) is a straight quadrangular prism, and the included angle between the second claw-shaped injection molding part (4) and the first claw-shaped injection molding part (3) on the horizontal projection plane is obtuse; the side wall thickness of the second claw-shaped injection molding part (4) is 0.8mm-1.2mm, and the top wall thickness and the bottom wall thickness of each set of second claw-shaped injection molding parts (4) are different.

9. An injection molded part according to claim 6, characterized in that The third injection molding part (5) is circular arc-shaped, and a round corner is arranged at the connecting position of the second claw-shaped injection molding part (4) and the third injection molding part (5).

10. An injection molded part according to claim 6, characterized in that The third injection molding part (5) is provided with a positioning hole (7).

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