Injection molding cohesive force testing mold

Abstract

The utility model discloses an injection molding cohesive force testing mold, belongs to the technical field of cohesive force testing, and is designed for solving the problems of poor accuracy of a measurement result and the like caused by uncontrolled size of an existing test sample piece. The utility model discloses an injection molding cohesive force testing mold. The injection molding cohesive force testing mold comprises a mold main body and a mold core, wherein the mold main body is at least provided with a first cavity, a second cavity and an injection molding runner; the occupying assembly at least comprises a first occupying part, a second occupying part and a third occupying part, the first occupying part is detachably arranged in one of the first cavity and the second cavity, and the second occupying part and the third occupying part are detachably arranged in the other one of the first cavity and the second cavity. According to the injection molding cohesive force testing mold disclosed by the utility model, an injection molding space is reserved for a test sample piece by utilizing the occupying component, the sizes of two injection molding materials meet requirements, the fracture caused by insufficient size of one injection molding piece in the process of applying tensile force is avoided, and the cohesive force measurement accuracy is high.

Description

Technical Field

[0001] The utility model relates to the technical field of adhesion force testing, in particular to an injection molding adhesion force testing mold. Background Art

[0002] The injection molding adhesion force refers to the bonding force formed between plastics and a mold or between two plastics during the injection molding process. The numerical value of the adhesion force will affect the structural integrity of the injection molded product and its reliability during use, thus affecting the quality and performance of the plastic product.

[0003] Currently, when testing the adhesion force of two-color injection molding, an initial part is first injection molded with one material, and then the initial part is thinned or shortened according to the test requirements to form a test sample part. Then, the test sample part is placed in the mold cavity, and the second material is injected into the cavity to bond the two materials together. A force measuring instrument can be used to measure the tensile strength between the two materials.

[0004] The defects of this method include: it is difficult to precisely control the size during manual thinning or shortening, resulting in the size of the test sample part exceeding the standard range. The measurement result of the finished product after injection molding with the second material is difficult to reflect the adhesion force between plastics. Specifically, the test sample part is prone to breakage at the positions where it is too thin, too short, and too narrow, affecting the accuracy of the adhesion force measurement result. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an injection molding adhesion force testing mold, which solves the problem of poor measurement result accuracy caused by uncontrolled size of the existing test sample parts and has a good user experience.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The injection molding adhesion force testing mold includes: a mold body, on which at least a first cavity, a second cavity, and an injection molding runner are provided. The injection molding runner is communicated with the first cavity through a first gate, and the injection molding runner is communicated with the second cavity through a second gate; and a placeholder assembly, which at least includes a first placeholder, a second placeholder, and a third placeholder. The first placeholder is detachably arranged in one of the first cavity and the second cavity, and the second placeholder and the third placeholder are detachably arranged in the other of the first cavity and the second cavity.

[0008] In one preferred embodiment, the injection molding runner is in a Z shape. One end of the injection molding runner is communicated with the first cavity through the first gate, the other end of the injection molding runner is communicated with the second cavity through the second gate, and the middle part of the injection molding runner is located between the first cavity and the second cavity.

[0009] In one preferred embodiment, the injection molding runner is symmetrically distributed with respect to the central axis of the mold body.

[0010] In one preferred embodiment, the first cavity and / or the second cavity is in the shape of a dumbbell that is wide at both ends and narrow in the middle.

[0011] In one preferred embodiment, exhaust grooves are formed in the mold body, and the exhaust grooves are directly or indirectly communicated with the first cavity and the second cavity.

[0012] In one preferred embodiment, a heat insulation plate is arranged in the mold body, and the heat insulation plate at least partially surrounds the outer periphery of the first cavity and / or the second cavity.

[0013] In one preferred embodiment, a horizontal reinforcing member, a vertical reinforcing member, and an inclined reinforcing member are further arranged in the mold body. The horizontal reinforcing member and the vertical reinforcing member are connected to each other, the horizontal reinforcing member and the inclined reinforcing member are connected to each other, and the horizontal reinforcing member abuts against one side of the heat insulation plate away from the surface of the mold body.

[0014] In one preferred embodiment, heat insulation plates are arranged on the inner sides of the walls of the mold body, and the horizontal reinforcing member, the vertical reinforcing member, and the inclined reinforcing member are arranged between two adjacent layers of the heat insulation plates.

[0015] In one preferred embodiment, the injection molding adhesion test mold further includes a measurement connecting rod and a measurement force-applying rod that are connected to each other, and the measurement connecting rod is connected to the mold body.

[0016] In one preferred embodiment, at least part of the measurement force-applying rod is wrapped with a protective pad.

[0017] The injection molding adhesion test mold disclosed by the present utility model includes a mold body and a placeholder assembly. After one injection molding, the placeholder assembly is removed, and the space left by the placeholder assembly meets the length, width, and thickness requirements of the test sample piece. After re-injection molding, the two injection molding materials are in more sufficient contact, and during the process of applying a tensile force, breakage will not occur due to insufficient dimensions of one of the injection molded parts, and the measurement accuracy of the adhesion force is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the injection molding adhesion test mold provided by the specific embodiment of the present utility model when the placeholder assembly is not placed;

[0019] Figure 2 is a schematic structural diagram of the injection molding adhesion test mold provided by the specific embodiment of the present utility model when the placeholder assembly is placed;

[0020] Figure 3It is a schematic diagram of the combined structure of the heat insulation plate, the horizontal reinforcing member, the vertical reinforcing member, and the diagonal reinforcing member provided by the specific embodiment of the present utility model;

[0021] Figure 4 It is a cross-sectional view of the combined structure of the measuring force application rod and the protective pad provided by the specific embodiment of the present utility model;

[0022] Figure 5 Is Figure 4 The partial enlarged view of A in

[0023] In the figure:

[0024] 1. Mold body; 3. Heat insulation plate; 4. Horizontal reinforcing member; 5. Vertical reinforcing member; 6. Diagonal reinforcing member; 7. Measuring connecting rod; 8. Measuring force application rod; 9. Protective pad; 11. First cavity; 12. Second cavity; 13. Injection molding runner; 14. Venting groove; 21. First placeholder; 22. Second placeholder; 23. Third placeholder; 91. First magic tape; 92. Second magic tape; 93. Filling layer; 131. First gate; 132. Second gate. Specific embodiment

[0025] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the specific embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0026] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0027] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0028] In the present utility model, unless otherwise clearly specified and defined, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0030] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0031] This embodiment discloses an injection molding adhesion test mold for measuring the adhesion between plastics and other materials as well as between two plastics. As Figure 1 and Figure 2As shown in the figure, the injection molding adhesion test mold includes a mold body 1 and a placeholder assembly. The mold body 1 is at least provided with a first cavity 11, a second cavity 12 and an injection molding runner 13. The injection molding runner 13 is communicated with the first cavity 11 through a first gate 131, and the injection molding runner 13 is communicated with the second cavity 12 through a second gate 132. The placeholder assembly at least includes a first placeholder 21, a second placeholder 22 and a third placeholder 23.

[0032] The first placeholder 21 is detachably arranged in one of the first cavity 11 and the second cavity 12, and the second placeholder 22 and the third placeholder 23 are detachably arranged in the other of the first cavity 11 and the second cavity 12. In this embodiment, the first cavity 11 is located on the left side of the front end of the mold body 1, the second cavity 12 is located on the right side of the front end of the mold body 1, and the injection molding runner 13 is located at the middle position of the front end of the mold body 1. The first placeholder 21 is arranged in the first cavity 11, the second placeholder 22 is arranged at the lower part of the second cavity 12, and the third placeholder 23 is arranged at the upper part of the second cavity 12.

[0033] During injection molding, first place the placeholder assembly at the position where the test sample piece needs to be placed. The shape and size of the placeholder assembly are both consistent with the standard shape and standard size of the test sample piece. After the injection molding material enters the cavity, it can only fill the space between the placeholder assembly and the cavity wall. After injection molding is completed, take out the placeholder assembly to leave a space for the test sample piece in the cavity. Replace the second material and fill it again through the injection molding runner 13. After the injection molding material completely fills the gap, the two injection molding materials are closely adhered together, which can be used to measure the adhesion force and is more convenient to use.

[0034] The space left by the placeholder assembly is the standard size of the test sample piece. The shape and size of the test sample piece obtained when filling the injection molding material again meet the standards, and there will be no problem that the sizes of the two injection molding material products are inconsistent caused by manual shearing and shortening in the prior art, and the measurement accuracy of the adhesion force is high.

[0035] The injection molding adhesion test mold includes at least two cavities and at least three placeholders. One or more placeholders can be selected and removed according to specific needs and replaced with one or more test sample pieces. The applicable range is wider, and the injection molding adhesion test can be carried out on multiple test sample pieces at the same time, with high test efficiency and good user experience.

[0036] The specific shape of the injection runner 13 is not limited, as long as it can convey the injection material into the first cavity 11 and the second cavity 12. In this embodiment, the injection runner 13 is in a Z shape. One end of the injection runner 13 is connected to the first cavity 11 through the first gate 131, the other end of the injection runner 13 is connected to the second cavity 12 through the second gate 132, and the middle part of the injection runner 13 is located between the first cavity 11 and the second cavity 12. The overall structure is more compact, avoiding excessive increase in the volume of the mold body 1 and saving space.

[0037] In this embodiment, the injection runner 13 is symmetrically distributed with respect to the central axis of the mold body 1, and the distances for the injection material to flow into the first cavity 11 and the second cavity 12 are basically the same. When test sample pieces are arranged in both the first cavity 11 and the second cavity 12, the bonding degrees between the injection material and all the test sample pieces are basically the same, and the measurement of the bonding force is more accurate.

[0038] In order to further improve the position stability of the positioning components in the cavity, the first cavity 11 and / or the second cavity 12 are in a dumbbell shape that is wide at both ends and narrow in the middle. Correspondingly, the first positioning piece 21, the second positioning piece 22, and the third positioning piece 23 are also in a dumbbell shape or half a dumbbell shape. In this embodiment, the first positioning piece 21 is in a dumbbell shape, and the second positioning piece 22 and the third positioning piece 23 form a dumbbell shape after being combined. The narrow position in the middle of the first cavity 11 and / or the second cavity 12 can prevent the wider structures at both ends from shifting, enabling the positioning components to remain stable in position under the impact of the injection material flow.

[0039] On the basis of the above structure, an exhaust groove 14 is provided on the mold body 1. The exhaust groove 14 is directly or indirectly connected to the first cavity 11 and the second cavity 12, and is used to discharge the air that flows into the first cavity 11 and the second cavity 12 along with the injection material, ensuring that there are no air bubbles in the injection-molded product.

[0040] The specific number and shape of the exhaust grooves 14 are not limited. In this embodiment, a total of three exhaust grooves 14 are provided on the mold body 1, which are respectively located at the top and the left and right sides of the second cavity 12. In view of the tendency of air to move upward in the injection material, one of the exhaust grooves 14 is provided at the top of the second cavity 12, and the other exhaust groove 14 extends from the middle part of the side of the second cavity 12 to the top of the second cavity 12, with good exhaust effect.

[0041] In order to reduce the injection resistance in the first cavity 11, an exhaust groove is also provided at the bottom of the first cavity 11. During the injection process, as the injection material gradually enters the first cavity 11, the air in the first cavity 11 is discharged through the exhaust groove at the bottom, avoiding the formation of air bubbles in the injection material, resulting in better performance of the injection-molded part and higher injection efficiency.

[0042] To avoid the situation where there is no injection molding material in the cavities located at the rear due to premature cooling of the injection molding material, as Figure 3 shown, a heat insulation plate 3 is provided in the mold body 1. The heat insulation plate 3 at least partially surrounds the outer periphery of the first cavity 11 and / or the second cavity 12, reducing the amount of heat exchange between the injection molding material in the first cavity 11 and / or the second cavity 12 and the surrounding environment, and making the flow of the injection molding material smoother.

[0043] To enhance the heat insulation effect, heat insulation plates 3 are provided on the inner sides of the walls of the mold body 1. That is, the heat insulation plate 3 is not a single-sided structure, but a pocket-shaped double-layer structure.

[0044] Based on the above structure, a horizontal strengthening member 4, a vertical strengthening member 5, and an inclined strengthening member 6 are also provided in the mold body 1. The horizontal strengthening member 4 and the vertical strengthening member 5 are connected to each other, the horizontal strengthening member 4 and the inclined strengthening member 6 are connected to each other, and the horizontal strengthening member 4 abuts against one side of the heat insulation plate 3 away from the surface of the mold body 1. The structure composed of the horizontal strengthening member 4, the vertical strengthening member 5, and the inclined strengthening member 6 can effectively increase the strength of the mold body 1, prevent the mold body 1 from deforming due to long-term bearing of high-temperature injection molding material, and extend the service life of the mold body 1.

[0045] The specific shapes of the horizontal strengthening member 4, the vertical strengthening member 5, and the inclined strengthening member 6 and the connection methods between them are not limited. In this embodiment, the tops of multiple mutually parallel and evenly arranged horizontal strengthening members 4 respectively abut against the heat insulation plate 3, and the vertical strengthening member 5 and the inclined strengthening member 6 are respectively arranged between two adjacent horizontal strengthening members 4, making the overall structure more stable. Among them, the vertical strengthening members 5 are symmetrically distributed with respect to the central axis of the horizontal strengthening member 4; the inclined strengthening members 6 are used in pairs, and the two inclined strengthening members 6 are cross-fixed, with stronger load-bearing capacity.

[0046] When heat insulation plates 3 are provided on the inner sides of the walls of the mold body 1, the horizontal strengthening member 4, the vertical strengthening member 5, and the inclined strengthening member 6 are arranged between two adjacent layers of heat insulation plates 3, which can better support the heat insulation plate 3 and significantly increase the strength of the mold body 1.

[0047] As Figure 1 、 Figure 2 、 Figure 4 and Figure 5 shown, the injection molding adhesion test mold further includes a measurement connecting rod 7 and a measurement force application rod 8 that are connected to each other. The measurement connecting rod 7 is connected to the mold body 1. The measurement connecting rod 7 and the measurement force application rod 8 can cooperate with a tensile tester to measure the adhesion, making it more convenient to use.

[0048] Based on the above structure, at least part of the measurement force application rod 8 is wrapped with a protective pad 9, which helps to reduce the hard damage to the measurement force application rod 8 caused by hard contact during stretching, improve the protection ability, and extend the service life of the measurement force application rod 8.

[0049] The specific shape of the protective pad 9 is not limited, as long as it can protect the measuring force-applying rod 8. In this embodiment, a first magic tape 91 is provided at one end of the protective pad 9, and a second magic tape 92 that cooperates with the first magic tape 91 is provided at the other end. After the first magic tape 91 and the second magic tape 92 are pasted and fastened, a ring structure is formed to wrap the measuring force-applying rod 8.

[0050] In order to further improve the protection ability, a filling layer 93 is provided inside the protective pad 9. The specific material of the filling layer 93 is not limited, and any material that can effectively weaken the impact energy, has strong shape plasticity and low cost can be used. In this embodiment, the filling layer 93 is made of cotton.

[0051] Note that the above is only the preferred embodiment of the present utility model and the technical principles applied. Those skilled in the art will understand that the present utility model is not limited to the specific embodiments described here, and various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present utility model. Therefore, although the present utility model has been described in more detail through the above embodiments, the present utility model is not limited to the above embodiments only. Without departing from the concept of the present utility model, more other equivalent embodiments can be included, and the scope of the present utility model is determined by the scope of the appended claims.

Claims

1. Injection molding adhesion test mold, characterized in that: include: A mold body (1) is provided with at least a first mold cavity (11), a second mold cavity (12) and an injection runner (13), wherein the injection runner (13) is connected to the first mold cavity (11) through a first gate (131), and the injection runner (13) is connected to the second mold cavity (12) through a second gate (132); and A placeholder assembly comprises at least a first placeholder (21), a second placeholder (22) and a third placeholder (23), wherein the first placeholder (21) is detachably disposed in one of the first cavity (11) and the second cavity (12), and the second placeholder (22) and the third placeholder (23) are detachably disposed in the other of the first cavity (11) and the second cavity (12).

2. The injection molding adhesion testing mold according to claim 1, characterized in that: The injection channel (13) is in a Z-shape, one end of the injection channel (13) is connected to the first cavity (11) through the first gate (131), and the other end of the injection channel (13) is connected to the second cavity (12) through the second gate (132), and the middle part of the injection channel (13) is located between the first cavity (11) and the second cavity (12).

3. The injection molding adhesion testing mold according to claim 2, characterized in that: The injection flow channels (13) are symmetrically distributed relative to the central axis of the mold body (1).

4. The injection molding adhesion testing mold according to claim 1, characterized in that: The first cavity (11) and / or the second cavity (12) is in the shape of a dumbbell with wide ends and a narrow middle.

5. The injection molding adhesion testing mold according to claim 1, characterized in that: The mold body (1) is provided with an exhaust groove (14), and the exhaust groove (14) is directly or indirectly connected to the first cavity (11) and the second cavity (12).

6. The injection molding adhesion test mold according to any one of claims 1 to 5, characterized in that: A heat insulation board (3) is arranged inside the mold body (1), and the heat insulation board (3) at least partially surrounds the outer periphery of the first cavity (11) and / or the second cavity (12).

7. The injection molding adhesion testing mold according to claim 6, characterized in that: A horizontal reinforcement member (4), a vertical reinforcement member (5) and an oblique reinforcement member (6) are also provided in the mold body (1); the horizontal reinforcement member (4) and the vertical reinforcement member (5) are connected to each other, the horizontal reinforcement member (4) and the oblique reinforcement member (6) are connected to each other, and the horizontal reinforcement member (4) abuts against a side of the insulation board (3) away from the surface of the mold body (1).

8. The injection molding adhesion testing mold according to claim 7, characterized in that: The heat insulation board (3) is arranged on the inner side of the wall surface of the mold body (1), and the horizontal reinforcement member (4), the vertical reinforcement member (5) and the oblique reinforcement member (6) are arranged between two adjacent layers of the heat insulation board (3).

9. The injection molding adhesion testing mold according to any one of claims 1 to 5, characterized in that: The injection molding adhesion testing mold further comprises a measuring connecting rod (7) and a measuring force application rod (8) connected to each other, and the measuring connecting rod (7) is connected to the mold body (1).

10. The injection molding adhesion testing mold according to claim 9, characterized in that: The measuring force application rod (8) is at least partially wrapped with a protective pad (9).

Images