Die for manufacturing shear strength sample of bonding resin and steel wire

Abstract

The utility model relates to the technical field of high polymer materials, in particular to a shear strength sample manufacturing mold for bonding resin and a steel wire, which comprises a mold body, a mold structure is arranged on the mold body and comprises two accommodating grooves used for accommodating resin, the accommodating grooves are arranged along the thickness direction of the mold body, and the accommodating grooves are communicated with the mold body. The accommodating grooves are through grooves penetrating through the mold body, a gap used for placing a steel wire is formed in the mold body in the thickness direction of the mold body, the two ends of the gap are communicated with the two accommodating grooves respectively, a first exhaust groove is further formed in the mold body in the thickness direction of the mold body, and the first exhaust groove is communicated with the accommodating grooves. According to the utility model, bubbles in the adhesive resin can be discharged in the sample preparation process of the shear strength test, so that the influence on the test precision caused by cavities in the sample is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of polymer materials, and more specifically to a mold for manufacturing a shear strength sample of an adhesive resin and a steel wire. Background Art

[0002] GB / T 32439-2015, "Wire Mesh Reinforced Polyethylene Composite Pipes for Water Supply," sets requirements for the shear strength of the adhesive resin and steel wire in the pipe. To ensure that the finished pipe meets these requirements, specialized shear strength specimens of the adhesive resin and steel wire must be prepared for shear strength testing. These specimens are typically produced by compression molding using a flat-plate vulcanizer, necessitating the design of specialized molds. Resin is typically in the form of gum granules, which are heat-melted and extruded to obtain the desired shape. However, due to the gaps between the resin granules, air can remain. When the resin is heat-melted or extruded, this air cannot be removed and will deposit on the contact surface between the adhesive resin and the steel wire, creating gaps between the resin and the steel wire. This can lead to low shear strength test results and reduce the accuracy of the test results.

[0003] There is a Chinese utility model with the announcement number CN209327076U, which discloses a mold for quickly preparing steel wire glue shear strength test samples, including a bottom fixed plate, an edge baffle fixedly connected to the bottom fixed plate by resin on both sides of the bottom fixed plate, and a sample fixing component placed on the bottom fixed plate between the two edge baffles. The sample fixing component includes two outer limit members respectively abutting against the inner walls of the corresponding edge side plates, and a number of mutually cooperating middle limit members are provided between the two limit members. The two outermost middle limit members are tightly pressed against the outer limit members at the corresponding positions through their outer side walls. A limit top plate is provided above the bottom fixed plate, which is respectively abutted against the tops of the two edge baffles. The inner side of the outer limit block is provided with two rectangular through grooves set at intervals and running through its height direction.

[0004] However, in the above technical solution, since the rectangular through groove is a semi-closed structure, when the sample is made, both ends of the rectangular through groove are closed, resulting in the air in the rectangular through groove being unable to be discharged, causing the air to be deposited in the groove, resulting in a cavity there, which reduces the shear strength of the sample piece and affects the accuracy of the shear strength test. Utility Model Content

[0005] The purpose of the present invention is to overcome the problem in the prior art that the mold cannot discharge gas, which easily causes gas deposition and affects the test results. A mold for making shear strength samples of adhesive resin and steel wire is provided, which can discharge bubbles in the adhesive resin during the shear strength test sample preparation process, thereby avoiding the appearance of bubbles in the sample that affects the test accuracy.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a mold for making shear strength specimens of bonding resin and steel wire, comprising a mold body, a mold structure being provided on the mold body, the mold structure comprising two receiving grooves for placing resin, the receiving grooves being arranged along the thickness direction of the mold body, a gap for placing steel wire being opened on the mold body along its thickness direction, the two ends of the gap being respectively connected to the two receiving grooves, a first exhaust groove being further provided on the mold body along its thickness direction, the first exhaust groove being connected to the receiving groove.

[0007] In this technical solution, a mold structure is provided on the mold body. A single mold structure can produce a single shear strength test specimen for a bonding resin and steel wire at a time. The mold structure includes two receiving grooves, with a gap provided between the two receiving grooves. The ends of the gap are connected to the two receiving grooves. When producing the shear strength test specimen for a bonding resin and steel wire, the steel wire is first placed in the gap. The gap restricts the position of the steel wire, ensuring that the wire does not shift during subsequent test specimen production. The ends of the steel wire extend from the gaps into the receiving grooves. Adhesive resin particles are then placed in the receiving grooves, which determine the shape of the adhesive resin mass in the test specimen. The mold is then placed in a flat-plate vulcanizer for test specimen production. During this process, the adhesive resin in the receiving grooves is melted at high temperature and subjected to pressure. This causes the different adhesive resin particles to fuse together. The pressure causes the fused adhesive resin to deform, ultimately pressing it into the desired shape. During this process, the air in the receiving grooves is also subjected to pressure. The mold body is also equipped with an exhaust groove, with both ends connected to the outside world and the storage tank. When the air in the storage tank is pressurized, it can be discharged to the outside through the exhaust groove. This prevents air from accumulating in the adhesive resin and eventually forming cavities on the surface where it contacts the steel wire. This ensures that the presence of cavities in the adhesive resin will not affect the shear strength of the specimen and cause test errors. After the adhesive resin cools, the specimen is removed from the mold, and the excess adhesive resin is trimmed off the edges of the adhesive resin block with scissors to obtain a shear strength specimen with a smooth surface and no bubbles inside.

[0008] Preferably, the first venting groove extends toward the side wall of the mold body.

[0009] Preferably, a plurality of the mold structures are provided, the plurality of mold structures are parallel to each other, and the plurality of mold structures are arranged along the length direction of the mold body.

[0010] Preferably, a second exhaust groove is further included, and both ends of the second exhaust groove are respectively connected to the two receiving grooves located on the same side of the two adjacent mold structures.

[0011] Preferably, the depth of the first exhaust groove and the second exhaust groove is 0.5-1.5 mm, and the width of the first exhaust groove and the second exhaust groove is 5.5-6.5 mm.

[0012] Preferably, the width of the gap is d+0.05 to d+0.15 mm, where d is the diameter of the steel wire.

[0013] Preferably, the accommodating groove is a rectangular hole, and two sidewall surfaces of the accommodating groove parallel to the gap are inclined surfaces, and the two inclined surfaces are inclined toward the outside of the accommodating groove.

[0014] Preferably, the inclination angle of the inclined surface is 1° to 3°.

[0015] Preferably, an anti-sticking layer is further provided on the inner wall surface of the accommodating groove.

[0016] Preferably, the anti-sticking layer is a Teflon-plated structure.

[0017] Compared with the existing technology, the present invention has the following advantages: The present invention is provided with an exhaust groove to discharge bubbles in the resin during the shear strength test sample preparation process, preventing the formation of cavities in the sample that affect the test accuracy. A gap is provided to accommodate the steel wire and fix the steel wire position, preventing the steel wire from shifting during sample preparation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of a mold for making a shear strength test specimen of bonding resin and steel wire according to the present invention;

[0019] Figure 2 This is a cross-sectional view of a mold for making a shear strength test specimen of an adhesive resin and a steel wire according to the present invention;

[0020] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0021] In the accompanying drawings: 1. mold body; 2. mold structure; 3. venting groove; 4. second venting groove; 5. anti-sticking layer; 21. accommodating groove; 22. gap; 211. inclined surface. DETAILED DESCRIPTION

[0022] The drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate the embodiments, some components in the drawings may be omitted, enlarged, or reduced in size, and do not represent actual product dimensions. Those skilled in the art will understand that some well-known structures and their descriptions may be omitted from the drawings. The positional relationships depicted in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0023] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0024] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0025] Example 1

[0026] like Figure 1As shown, a mold for preparing a shear strength test specimen of an adhesive resin and a steel wire comprises a mold body 1, on which is provided a mold structure 2. The mold structure 2 comprises two receiving grooves 21 for placing resin, the receiving grooves 21 being arranged along the thickness direction of the mold body 1, and a slit 22 for placing the steel wire being opened along its thickness direction on the mold body 1, with the two ends of the slit 22 respectively connected to the two receiving grooves 21. The mold body 1 is also provided with a first venting groove 3 along its thickness direction, with the first venting groove 3 being connected to the receiving groove 21. The mold body 1 is provided with the mold structure 2, and a single mold structure 2 can prepare a shear strength test specimen of an adhesive resin and a steel wire at a time. The mold structure 2 comprises two receiving grooves 21, with a slit 22 provided between the two receiving grooves 21, with the two ends of the slit 22 respectively connected to the two receiving grooves 21. When preparing the shear strength test specimen of an adhesive resin and a steel wire, the steel wire is first placed in the slit 22. The gap 22 has a limiting effect on the position of the steel wire, ensuring that the position of the steel wire will not be offset during the subsequent sample production process. The two ends of the steel wire extend from the two ends of the gap 22 and extend into the receiving groove 21. The adhesive resin particles are then placed in the receiving groove 21, and the receiving groove 21 is used to determine the shape of the adhesive resin block in the sample. The mold is then placed in a flat vulcanizer for sample production. In this process, the adhesive resin in the receiving groove 21 is melted at high temperature and pressurized. At this time, different adhesive resin particles are welded together, and under the action of pressure, the welded adhesive resin is deformed and finally pressed into the desired shape. In this process, the air in the receiving groove 21 is also affected by pressure. An exhaust groove 3 is also provided on the mold body 1, and the two ends of the exhaust groove 3 are respectively connected to the outside world and the receiving groove 21. When air in the containment tank 21 is pressurized, it can be discharged to the outside through the exhaust groove 3. This prevents air from accumulating in the adhesive resin and forming cavities on the surface in contact with the steel wire, which could affect the shear strength of the specimen and cause test errors. After the adhesive resin cools, the specimen is removed from the mold, and the excess adhesive resin is trimmed off the edges of the adhesive resin block with scissors to obtain a shear strength specimen with a smooth surface and no bubbles inside.

[0027] like Figure 1 As shown, the first exhaust groove 3 extends toward the side wall of the mold body 1. The first exhaust groove 3 connects the accommodating groove 21 with the outside, forming a channel for gas to pass through. The gas shell in the adhesive resin is discharged from the side wall of the mold body 1 through the first exhaust groove 3.

[0028] like Figure 1As shown, multiple mold structures 2 are provided, each parallel to the other and arranged along the length of the mold body 1. By providing multiple mold structures 2 on the same mold body, multiple specimens can be produced at once, improving specimen production efficiency. The mold structures 2 are elongated and parallel to each other, ensuring that each does not interfere with the other. Different mold structures can be used to produce different specimens, meeting different test requirements and shortening specimen production time.

[0029] like Figure 1 As shown, the mold body 1 further includes a second venting groove 4, the two ends of which are respectively connected to the two receiving grooves 21 located on the same side of the two adjacent mold structures 2. The second venting groove 4 connects the receiving grooves 21 in different mold structures 2, increasing the passage for gas flow on the mold body 1, facilitating the smooth discharge of bubbles in the receiving grooves 21 during the hot pressing process, and ensuring that the air pressure in the receiving grooves 21 in different mold structures 2 can be balanced. This ensures that the resin blocks 21 in the samples produced from different mold structures 2 are of the same specifications and have the same physical and chemical properties, and does not affect the test results due to differences in the adhesive resins of the samples produced from different mold structures 2.

[0030] like Figure 2 As shown, the depth of the first vent groove 3 and the second vent groove 4 is 0.5-1.5 mm, and the width of the first vent groove 3 and the second vent groove 4 is 5.5-6.5 mm. The vent groove 3 and the second vent groove 4 should be able to exhaust gas as quickly as possible, while also needing to have a small cross-sectional area to prevent more adhesive resin from entering the vent groove 3 and the second vent groove 4 during the molding process. Taking both requirements into consideration, the depth of the vent groove 3 and the second vent groove 4 should be between 0.5 and 1.5 mm, and the width of the vent groove 3 and the second vent groove 4 should be between 5.5 and 6.5 mm.

[0031] Example 2

[0032] This embodiment is similar to the above embodiment 1, except that Figure 1As shown, the width of the steel wire positioning gap 22 is d+0.05~d+0.15mm, where d is the diameter of the steel wire. During the process of hot-melt molding of the adhesive resin, the adhesive resin easily flows in through the connection between the steel wire positioning gap 22 and the accommodating groove 22, resulting in the surface of the steel wire being covered with a layer of adhesive resin after the sample is made, which needs to be manually cut off. On the one hand, it increases the workload of the staff, and on the other hand, it is easy to damage the surface of the steel wire during the shearing process with scissors. Therefore, the width of the steel wire positioning gap 22 is limited to between d+0.05~d+0.15mm, where d is the diameter of the steel wire. In this way, the steel wire positioning gap is reduced, and the excess adhesive resin is prevented from hot-melting and flowing into the steel wire positioning gap 22. It is no longer necessary to cut off the excess adhesive resin on the surface of the steel wire subsequently, and the deformation of the sample caused by improper operation during shearing is avoided, which affects the final shear strength result.

[0033] like Figure 3 As shown, the receiving groove 21 is a rectangular hole, and the two side walls of the receiving groove 21 parallel to the gap 22 are inclined surfaces 211, and the two inclined surfaces 211 are inclined toward the outside of the receiving groove 21. Because the adhesive resin is hot-melt molded in the receiving groove 21, the adhesive resin and the receiving groove 21 are tightly attached, resulting in the problem of difficulty in demolding after the sample is made. The two side walls of the receiving groove 21 parallel to the gap 22 are inclined surfaces 211, making the receiving groove 21 have an inverted trapezoidal structure. The cross-sectional area of ​​the receiving groove 21 increases toward the direction in which the sample is pulled out, making it easy to pull the sample out of the receiving groove 21.

[0034] like Figure 3 As shown, the angle of the inclined surface 211 is 1° to 3°. Limiting the angle of the inclined surface 211 to 1° to 3° not only ensures that the inclined surface 211 is as close to vertical as possible so that the adhesive resin block in the sample meets the requirements of GB / T32439-2015, but also makes it easier to pull the adhesive resin block in the sample out of the receiving groove 21.

[0035] Example 3

[0036] This embodiment is similar to the above embodiment 1, except that Figure 2 As shown, an anti-sticking layer 5 is also provided on the inner wall surface of the receiving groove 21. The mold body 1 is made of steel material. When the adhesive resin is hot-melted and molded in the receiving groove 21, the polar chemical bonds in the adhesive resin molecular chain form chemical bonds when they come into contact with the metal surface, making it difficult to demold the sample. The anti-sticking layer 5 is provided on the inner wall surface of the receiving groove 21. The anti-sticking layer 5 isolates the groove wall of the receiving groove 21, preventing the adhesive resin from coming into contact with the groove wall of the receiving groove 21, and ensuring that the adhesive resin does not chemically bond with the mold body 1 made of steel material during the hot-melt and molding process, making it easier to demold the sample.

[0037] like Figure 2 As shown, the anti-sticking layer 5 is a Teflon-coated structure. Teflon coating is a fluorine-based coating with polytetrafluoroethylene as its base resin. It is a high-performance coating that combines heat resistance, chemical inertness, excellent insulation stability, and low friction. Almost all substances do not adhere to the Teflon-coated structure. Even a very thin Teflon-coated structure exhibits excellent non-stick properties, preventing chemical adhesion between the adhesive resin and the walls of the receiving tank 21. The Teflon-coated structure also has excellent wear resistance and is not easily damaged even under high loads. It is also heat-resistant, so the hot melt and molding processes of the adhesive resin will not damage the Teflon-coated structure. Furthermore, the low friction of the Teflon-coated structure makes it easy to remove the adhesive resin block of the sample from the receiving tank 21.

[0038] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art will be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all implementation methods 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. A mold for making shear strength test specimens of bonding resin and steel wire, characterized in that: The invention comprises a mold body (1), wherein a mold structure (2) is provided on the mold body (1), wherein the mold structure (2) comprises two receiving grooves (21) for placing resin, wherein the receiving grooves (21) are provided along the thickness direction of the mold body (1), and a gap (22) for placing steel wire is provided on the mold body (1) along the thickness direction thereof, wherein the two ends of the gap (22) are respectively connected to the two receiving grooves (21), and a first exhaust groove (3) is further provided on the mold body (1) along the thickness direction thereof, wherein the first exhaust groove (3) is connected to the receiving groove (21).

2. The mold for making a shear strength test specimen of a bonding resin and a steel wire according to claim 1, characterized in that: The first exhaust groove (3) extends toward the side wall of the mold body (1).

3. The mold for preparing a shear strength test specimen of an adhesive resin and a steel wire according to claim 1, characterized in that: The mold structures (2) are provided in plurality, the plurality of mold structures (2) are parallel to each other, and the plurality of mold structures (2) are arranged along the length direction of the mold body (1).

4. The mold for preparing a shear strength test specimen of an adhesive resin and a steel wire according to claim 3, characterized in that: It also includes a second exhaust groove (4), the two ends of which are respectively connected to the two receiving grooves (21) located on the same side of the two adjacent mold structures (2).

5. The mold for making a shear strength test specimen of a bonding resin and a steel wire according to claim 4, characterized in that: The depth of the first exhaust groove (3) and the second exhaust groove (4) is 0.5 to 1.5 mm, and the width of the first exhaust groove (3) and the second exhaust groove (4) is 5.5 to 6.5 mm.

6. The mold for preparing a shear strength test specimen of an adhesive resin and a steel wire according to claim 1, characterized in that: The width of the gap (22) is d+0.05 to d+0.15 mm, wherein d is the diameter of the steel wire.

7. The mold for preparing a shear strength test specimen of an adhesive resin and a steel wire according to claim 1, characterized in that: The accommodating groove (21) is a rectangular hole, and two sidewall surfaces of the accommodating groove (21) parallel to the gap (22) are inclined surfaces (211), and the two inclined surfaces (211) are inclined toward the outside of the accommodating groove (21).

8. The mold for preparing a shear strength test specimen of an adhesive resin and a steel wire according to claim 7, characterized in that: The inclined surface (211) has an inclination angle of 1° to 3°.

9. The mold for preparing a shear strength test specimen of an adhesive resin and a steel wire according to claim 1, characterized in that: An anti-sticking layer (5) is also provided on the inner wall surface of the accommodating groove (21).

10. The mold for preparing a shear strength test specimen of an adhesive resin and a steel wire according to claim 9, characterized in that: The anti-sticking layer (5) is a Teflon-plated structure.

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