Test piece forming die

Abstract

The utility model relates to the technical field of test equipment of building materials, and particularly discloses a test piece forming mold which comprises a bottom plate and a side frame, the bottom plate and the side frame are formed by pouring silica gel, the side frame is formed by pouring silica gel of various hardness, the hardness is sequentially reduced from bottom to top, and the larger the depth is, the larger the pressure intensity is when a flow material is poured. The pressure borne by the side frame of the forming mold is gradually increased from top to bottom, the bottom of the side frame of the forming mold is made of silica gel with high hardness, the hardness of the side frame is sequentially reduced from bottom to top, and the side frame of the mold is arranged to be multiple layers of silica gel with different hardness according to different stress borne by different parts during casting of a test piece. The advantages that soft silica gel is easy to demould and hard silica gel is not easy to deform are considered, demoulding is convenient when a test piece is manufactured, and the size of the test piece is accurate.

Description

Technical Field

[0001] This utility model relates to the technical field of testing equipment for building materials, specifically a specimen molding mold. Background Technology

[0002] In the field of building materials, material performance testing typically requires the use of molds for material shaping. Different performance tests have different dimensional requirements for specimens, and dimensional deviations must be controlled within a certain range. The numerous and varied specimen requirements often correspond to molds made from different materials and by different manufacturers, which can create difficulties for testing personnel in managing, purchasing, maintaining, and repairing their equipment. Furthermore, these devices often require matching auxiliary equipment or materials for better molding and demolding, further increasing the workload for staff.

[0003] Taking cement mortar specimens as an example, mechanical property testing typically uses a 40*40*160mm triple steel mold. This mold is cumbersome to assemble and disassemble, and to prevent leakage, grease is sometimes applied to the joint edges for better sealing. For concrete specimens, there are size requirements such as 100*100*100cm and 150*150*150cm. Currently, plastic molds are generally used, with air compressors used for demolding. However, this method not only requires auxiliary equipment like air compressors but also sometimes results in specimens getting stuck in the mold, making them difficult to remove and causing damage to both the specimen and the mold. In addition, other building material testing indicators such as density testing, water absorption thickness testing, static bending strength, modulus of elasticity, nail-holding power, thermal conductivity and water absorption, and formaldehyde emission testing each have their own size and specification requirements. The preparation and fabrication of these specimens often consume a significant amount of time and effort.

[0004] For example, patent CN205631144U discloses a silicone mold that prevents shrinkage and deformation. The base plate and the annular frame are an integral structure. The annular fixing frame is partially embedded within the annular frame and partially embedded within the base plate. The mesh layer is wrapped around both ends of the annular fixing frame before being embedded into the base plate. The annular fixing frame improves the strength and hardness of the silicone mold, preventing shrinkage and deformation, and improving the straightness and regularity of the mold's edges. However, this mold has the following drawback: while increasing the hardness of the silicone mold, it makes demolding difficult. Utility Model Content

[0005] To address the shortcomings of existing technologies, the present invention provides a specimen molding mold that solves the problem of inconvenient demolding in existing molding molds.

[0006] To solve the above problems, the technical solution adopted by this utility model is: a specimen molding mold, including a base plate and a side frame. The base plate and the side frame are both made of silicone casting. The side frame is made of silicone with different hardnesses, with the hardness decreasing from bottom to top. The greater the depth of the casting material, the greater the pressure. The pressure on the side frame of the molding mold gradually increases from top to bottom. The bottom of the side frame of the molding mold is made of high-hardness silicone. The hardness of the side frame decreases from bottom to top, which can prevent the specimen from deforming.

[0007] The beneficial effects of this solution are: compared with the existing technology, according to the different stresses in different parts of the specimen during casting, the side frame of the mold is set as multiple layers of silicone with different hardness, which takes into account the advantages of soft silicone being easy to demold and hard silicone being not easily deformed, making it convenient to demold the specimen and ensuring accurate specimen dimensions.

[0008] Furthermore, the base plate is made of silicone with a hardness of 20°A. The low hardness of the base plate allows pressure to be applied to it after the specimen is cast, which helps with demolding.

[0009] Furthermore, the side frame is made of silicone with a hardness of 40°A, 30°A, and 20°A from bottom to top.

[0010] Furthermore, the thickness of the base plate is 0.3-1cm.

[0011] Furthermore, the thickness of the side frame is 1cm.

[0012] Furthermore, the silicone height of 40°A is 20%-40% of the side bezel height, the silicone height of 30°A is 50%-60% of the side bezel height, and the silicone height of 20°A is 10%-20% of the side bezel height. Attached Figure Description

[0013] Fig. 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Fig. 2 This is a schematic front sectional view of the present invention;

[0015] In the diagram: 1-base plate, 2-side frame. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Implementation, for example, attached Figs. 1-2 As shown: A specimen molding mold includes a base plate 1 and a side frame 2. Both the base plate 1 and the side frame 2 are made of silicone. The side frame 2 is made of silicone with different hardnesses, with the hardness decreasing from bottom to top. The greater the depth of the material during casting, the greater the pressure. The pressure on the side frame 2 gradually increases from top to bottom. The bottom of the side frame 2 is made of high-hardness silicone. The hardness of the side frame 2 decreases from bottom to top, which can effectively prevent specimen deformation.

[0018] The base plate 1 is made of silicone with a hardness of 20°A. The low hardness of the base plate 1 allows for easy demolding by applying pressure to the base plate 1 after casting the specimen. The side frame 2 is made of silicone with a hardness of 40°A, 30°A, and 20°A from bottom to top. The thickness of the base plate 1 is 0.3-1cm, and the thickness of the side frame 2 is 1cm. The height of the 40°A silicone is 20%-40% of the height of the side frame 2, the height of the 30°A silicone is 50%-60% of the height of the side frame 2, and the height of the 20°A silicone is 10%-20% of the height of the side frame 2.

[0019] The specific implementation process is as follows:

[0020] The method for making the molding die is as follows: First, prepare a standard specimen using a conventional mold according to the testing requirements; prepare a container whose length, width, and height are all 1 cm greater than the standard specimen. The container is open at the top and sealed on all sides. Adhere tape or apply glue to the bottom of the standard specimen and attach it to the bottom of the container. The tape or glue should be easily removable. Apply 20°A silicone to the surface of the standard specimen by pouring or smearing until it is completely coated; start pouring 20°A silicone from the bottom of the container. When the silicone flows to 10%-20% of the height of the standard specimen... Stop pouring when the time is right; continue pouring with 30°A silicone, and stop pouring when the silicone flows to 60%-80% of the height of the standard specimen; continue pouring with 40°A silicone, and stop pouring when the silicone flows to 100% of the height of the standard specimen, at which point the silicone is flush with the standard specimen, and the height of the standard specimen is consistent with the height of the prepared side frame; continue pouring with 20°A silicone, and stop pouring when the silicone flows to 0.3-1cm above the surface of the standard specimen; let stand until the silicone is completely solidified and molded, then demold the standard specimen to obtain the specimen molding mold.

[0021] A molding die was made according to the above method. Test specimens were then made using this die (standard specimen dimensions: length 100cm, width 100cm, height 100cm). The specimen dimensions and demolding results are shown in the table below.

[0022]

[0023] In summary, the specimen molding mold produces specimens with minimal deformation and facilitates demolding, making it suitable for the fabrication of fluid material specimens in the construction field and demonstrating good practicality.

[0024] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A test piece molding mold comprising a base plate and a side frame, characterized by: The bottom plate and the side frame are both made of silica gel pouring, and the side frame is made of silica gel with multiple hardnesses, which decreases from bottom to top.

2. The test piece molding die according to claim 1, characterized by: The bottom plate is made of silica gel with a hardness of 20°A.

3. The test piece molding die according to claim 1, characterized by: The side frame is made of silica gel with a hardness of 40°A, 30°A and 20°A from bottom to top.

4. The test piece molding die according to claim 1, characterized by: The thickness of the bottom plate is 0.3-1cm.

5. The test piece molding die according to claim 1, characterized by: The thickness of the side frame is 1cm.

6. The test piece molding die according to claim 3, characterized by: The height of the silica gel with a hardness of 40°A is 20%-40% of the height of the side frame, the height of the silica gel with a hardness of 30°A is 50%-60% of the height of the side frame, and the height of the silica gel with a hardness of 20°A is 10%-20% of the height of the side frame.

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