Tool for preparing compression sample

Abstract

The utility model provides a tool for preparing a compressed sample. The tool comprises an assembling mechanism and a pressurizing mechanism, the assembling mechanism comprises a working table, a movable baffle, a lower-layer working section barrier strip and an upper-layer working section barrier strip; the pressurizing mechanism comprises a supporting column, a pressure rod is hinged to the supporting column, a first pressure column and a second pressure column pointing to the direction of the working table are fixed to the pressure rod, a plane pressure sensor is arranged on the lower end face of the first pressure column, a plane pressure head is arranged on the lower end face of the second pressure column, and an adjustable weight is hung below the end, away from the hinge point, of the pressure rod. The compression sample manufacturing device is reasonable in structural design, can effectively manufacture compression samples meeting requirements, can effectively ensure that working sections are equal in length and symmetrical in position, enables pressurization pressure to be more uniform when a reinforcing sheet and a laminated board are solidified, ensures that the pressure of the compression samples is uniform, does not need various sample manufacturing devices, and effectively reduces sample manufacturing cost.

Description

Technical Field

[0001] The utility model relates to the field of composite materials, in particular to the preparation of compression test specimens of prepreg layers, and in particular to a tool for preparing compression test specimens. Background Art

[0002] In measuring the compression properties of polymer-based composite laminates, the industry currently generally uses the ASTM D6641 standard test method for testing.

[0003] At present, the finished compression specimens that need to be made are usually Figure 1 As shown, the overall size is 140mm (length) * 13mm (width) * 6mm (thickness), including the laminate, the laminate is 160*160mm, and the left and right sides of the laminate are respectively pasted and cured with upper and lower reinforcing sheets, the size of the reinforcing sheet is 73.5*160mm. There is an intermediate interval section (also called the working section, used to paste the sensor) between the upper and lower reinforcing sheets, and the spacing is 13mm. The laminate and the reinforcing sheet are pasted and cured and then cut as a whole to form Figure 1 Small specimen in.

[0004] When preparing compression specimens that comply with ASTM D6641, when attaching the reinforcement sheet, it is usually carried out by bagging and curing after attaching the reinforcement sheet and then cutting. The advantage of this method is that the pressure is uniform. However, this preparation method also has disadvantages. The preparation of the specimen requires a large cost investment, such as the use of flat molds, vacuum auxiliary materials, vacuum equipment, curing furnaces, and even autoclaves, which are relatively expensive.

[0005] Therefore, it is necessary to design a tool that can effectively save investment costs to prepare compression specimens in response to this defect. Utility Model Content

[0006] The technical problem to be solved by the utility model is: in order to overcome the deficiencies of the prior art, the utility model provides a tooling for preparing a compression specimen, which can effectively reduce the investment cost of preparing the specimen and effectively ensure uniform pressurization of the reinforcing sheet.

[0007] The technical solution adopted by the utility model to solve its technical problems is: a tool for preparing a compression specimen, used for assembling a laminate and a reinforcing sheet of the compression specimen, the tool comprising an assembling mechanism and a pressurizing mechanism; the assembling mechanism comprises a work surface, a movable baffle is adjustable in the horizontal direction on the work surface, a wide side of one side of the laminate is in contact with the movable baffle, a lower working section baffle and an upper working section baffle are respectively positioned on the work surface, the thickness of the lower working section baffle and the upper working section baffle are the same as the thickness of the reinforcing sheet, and the distance of the lower working section baffle relative to the upper working section baffle in the vertical direction is adjustable; the pressurizing mechanism The pressing mechanism includes a support column fixed on the work surface, a pressure rod is hinged on the support column, and a first pressure column and a second pressure column pointing in the direction of the work surface are fixed on the pressure rod respectively, wherein the lower end face of the first pressure column is provided with a plane pressure sensor, the lower end face of the second pressure column is arranged corresponding to the direction of the upper working section baffle bar and the lower end face of the second pressure column has a plane pressure head, an adjustable weight is hung under the end of the pressure rod away from the hinge point, and the plane pressure head is pressed above the reinforcing plate located on the upper layer under the downward pressure of the adjustable weight on the pressure rod, and the plane pressure sensor contacts the work surface and obtains a pressure signal under the downward pressure of the adjustable weight on the pressure rod.

[0008] In the above scheme, the two reinforcing sheets located at the lower layer can be positioned by the cooperation of the movable baffle plate and the lower working section baffle bar. After positioning, the laminate can be stacked and then separated by the upper working section baffle bar, so as to facilitate the positioning and setting of the two reinforcing sheets located at the upper layer. At the same time, the pressure mechanism adjusts the pressure on the reinforcing sheet through the principle of lever, through the cooperation of the plane pressure sensor and the adjustable weight, so as to meet the pressure requirements for preparing the sample.

[0009] Furthermore, in order to prevent glue overflow during curing and cause unnecessary adhesion, the reinforcing sheet located on the upper layer is covered with an isolation film.

[0010] Furthermore, a silicone pad is placed on the isolation film, and the silicone pad is the same shape and size as the reinforcing sheet, and the flat pressure head is pressed on the upper surface of the silicone pad. The setting of the silicone pad can make the pressure more uniform, and even if the surface of the reinforcing sheet is slightly uneven, the silicone pad can be used to buffer and maintain uniform pressure.

[0011] Furthermore, the work surface and the movable baffle are adjusted and positioned via a threaded connection, and horizontal bolts and nuts are provided in groups on both sides of the work surface. The movable baffle is adjustable in position in the horizontal direction via the horizontal bolts and nuts and the work surface.

[0012] Furthermore, the upper working section baffle bar and the lower working section baffle bar are also adjusted and positioned by threaded connection. A threaded hole is provided at the position where the lower working section baffle bar is positioned corresponding to the work surface. A fixing bolt is threadedly connected in the threaded hole. The lower working section baffle bar is provided with a threaded hole that cooperates with the fixing bolt; the upper working section baffle bar is also provided with a threaded hole that cooperates with the fixing bolt. A fixing nut that cooperates with the fixing bolt is also provided at the corresponding threaded hole of the upper working section baffle bar. The fixing nut positions and crimps the upper working section baffle bar in the vertical direction.

[0013] Furthermore, in order to facilitate the positioning and placement of the reinforcing sheet, alignment auxiliary lines are respectively provided on the work surface at positions corresponding to the long sides of the reinforcing sheet and the positions where the long sides extend.

[0014] The beneficial effect of the utility model is that the tooling provided by the utility model for preparing compression specimens has a reasonable structural design, can effectively produce compression specimens that meet the requirements, can effectively ensure that the lengths of the working sections are equal and the positions are symmetrical, and at the same time make the pressurization pressure more uniform when the reinforcing sheets and the laminate are cured, thereby ensuring that the pressure of the compression specimens is uniform, and does not require a variety of specimen preparation devices, effectively reducing the cost of specimen preparation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 It is a schematic diagram of the structure of the finished compression specimen.

[0017] Figure 2 It is a schematic diagram of assembling the reinforcing sheet located at the lower layer according to the optimal embodiment of the utility model (the pressurizing mechanism is not shown).

[0018] Figure 3 It is a schematic diagram of assembling laminated boards according to the optimal embodiment of the utility model (the pressurizing mechanism is not shown).

[0019] Figure 4 It is a schematic diagram of assembling the reinforcing sheet located on the upper layer according to the optimal embodiment of the utility model (the pressurizing mechanism is not shown).

[0020] Figure 5 It is a schematic diagram of the optimal embodiment of the utility model after placing the isolation membrane and the silicone pad (the pressurizing mechanism is not shown).

[0021] Figure 6 It is a schematic diagram of the optimal embodiment of the utility model when the pressurizing mechanism is used for pressurizing.

[0022] In the figure, 1, reinforcing plate 2, laminate 3, movable baffle 4, horizontal bolts and nuts 5, work table 6, alignment auxiliary line 7, fixing bolts 8, lower working section baffle 9, upper working section baffle 10, silicone pad 11, isolation membrane 12, support column 13, first pressure column 14, second pressure column 15, pressure sense 16, adjustable weight 17, flat pressure head 18, flat pressure sensor. DETAILED DESCRIPTION

[0023] The utility model is now described in further detail in conjunction with the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, so they only show the components related to the utility model, and the directions and references (for example, up, down, left, right, etc.) can only be used to help describe the features in the drawings. Therefore, the following specific embodiments are not adopted in a restrictive sense, and the scope of the subject matter claimed is limited only by the attached claims and their equivalents.

[0024] like Figures 2 to 6 The tooling shown in FIG. 1 is used to prepare a compression specimen, which is the best embodiment of the present utility model. The tooling includes an assembly mechanism and a pressurizing mechanism, which are used to assemble the following: Figure 1 The compression specimen shown. The assembly mechanism is used for the preliminary positioning and assembly of the reinforcing sheet 1 and the laminate 2. The pressurizing mechanism is used to pressurize the positioned and assembled specimen to even out the internal pressure of the specimen.

[0025] Specifically, Figure 2 As shown, the assembly mechanism includes a work surface 5. In this embodiment, the work surface 5 is a two-stage planar structure with one end narrow and the other end wide.

[0026] Horizontal bolts and nuts 4 are arranged in groups on the section where the width of the work surface 5 changes, and a movable baffle 3 is adjustably connected to the side of the section through the horizontal bolts and nuts 4. The movable baffle 3 is adjusted to have a spacing with the working section baffle bar through the horizontal bolts and nuts 4, so that the spacing corresponds to the length of the reinforcing sheet 1.

[0027] At the wide section of the work surface 5, upper working section baffles 9 and lower working section baffles 8 are stacked up and down. The thickness of the lower working section baffles 8 and the upper working section baffles 9 are the same as the thickness of the reinforcing sheet 1, and the length of the working section baffles is set corresponding to the spacing of the middle interval section, which plays an effective role in positioning and separating the reinforcing sheets 1 on both sides. At the same time, the distance of the lower working section baffles relative to the upper working section baffles in the vertical direction is adjustable, which can be adjusted corresponding to the thickness of the laminate 2 sandwiched in the middle of the reinforcing sheet 1.

[0028] In this embodiment, the upper working section baffle 9 and the lower working section baffle 8 are also adjusted and positioned by threaded connection. Specifically, a threaded hole is provided at the position of the work table 5 corresponding to the positioning and setting of the lower working section baffle 8, and a fixing bolt 7 is threadedly connected in the threaded hole, and a threaded hole matching the fixing bolt 7 is provided on the lower working section baffle 8; a threaded hole matching the fixing bolt 7 is also provided on the upper working section baffle 9, and a fixing nut matching the fixing bolt 7 is also provided at the corresponding threaded hole of the upper working section baffle 9, and the fixing nut positions and presses the upper working section baffle 9 in the vertical direction.

[0029] At the same time, alignment auxiliary lines 6 are respectively provided on the work surface 5 at the positions corresponding to the long side and the extension of the long side of the reinforcing sheet 1. By arranging the alignment auxiliary lines 6 in parallel up and down and cooperating with the working section blocking bars with precise dimensions, it can be ensured that the working sections on the front and back sides of the specimen are equal in length and symmetrical in position.

[0030] like Figure 6 As shown, the pressurizing mechanism includes a support column 12 fixed on the work surface 5, and a pressure rod 15 is hinged on the support column 12. A first pressure column 13 and a second pressure column 14 pointing in the direction of the work surface 5 are fixed on the pressure rod 15, respectively. The lower end face of the first pressure column 13 is provided with a plane pressure sensor 18, and the lower end face of the second pressure column 14 is arranged corresponding to the direction of the upper working section baffle bar and the lower end face of the second pressure column 14 has a plane pressure head 17, and an adjustable weight 16 is hung at the end of the pressure rod 15 away from the hinge point. The plane pressure head 17 is pressed above the reinforcing plate 1 located on the upper layer under the downward pressure of the adjustable weight 16 on the pressure rod 15, and the plane pressure sensor 18 contacts the work surface 5 and obtains a pressure signal under the downward pressure of the adjustable weight 16 on the pressure rod 15.

[0031] Specifically, the length between the first pressure column 13 and the hinge point is L1, the pressure of the first pressure column 13 is F1, the length between the second pressure column 14 and the hinge point is L2, the pressure of the second pressure column 14 is F2, the length between the hanging position of the adjustable weight 16 and the hinge point is L3, and the mass of the adjustable weight 16 is M. According to the principle of simple lever, F1*L1+F2*L2=F3*L3, where F1 is obtained by testing the plane pressure sensor 18, L1, L2, and L3 are known, and F3 is the adjustable weight 16, whose mass is M, then F3=Mg, so it can be obtained that F2=(F3*L3-F1*L1) / L2, that is, by replacing and adjusting the adjustable weight 16, the size of F2 can be adjusted to meet the pressure required for the test preparation. 3) By adjusting the weight and coordinating with the sensor reading, the applied pressure of the reinforcing sheet 1 for curing is quantified.

[0032] In actual use, in order to prevent glue overflow during curing and cause unnecessary adhesion, the reinforcing sheet 1 located on the upper layer is covered with an isolation film 11. A silicone pad 10 is placed on the isolation film 11. The silicone pad 10 has the same shape and size as the reinforcing sheet 1, and the flat pressure head 17 is pressed on the upper surface of the silicone pad 10. The setting of the silicone pad 10 can make the pressurization pressure more uniform. Even if the surface of the reinforcing sheet 1 is slightly uneven, the silicone pad 10 can buffer and maintain uniform pressure.

[0033] The above-mentioned tooling has the following sample preparation process:

[0034] 1. Laminate 2 and reinforcing sheet 1 are machined and cut into sizes that meet the test standard requirements. Generally, laminate 2 is 160*160mm, with a total of 1 piece. Reinforcing sheet 1 is 73.5*160mm, with a total of 4 pieces.

[0035] 2. Stick the adhesive film on one side of each of the four reinforcing sheets 1. Figure 2 As shown, take two reinforcing sheets 1, and place one reinforcing sheet 1 between the movable baffle 3 and the lower working section baffle 8, with the surface pasted with the adhesive film facing upward. Adjust the nut of the movable baffle 3 so that the reinforcing sheet 1 is fixed and clamped between the movable baffle 3 and the lower working section baffle 8. The thickness of the working section baffle needs to be the same as that of the reinforcing sheet 1, and apply a release agent before use. Then place the second reinforcing sheet 1 along the alignment auxiliary line 6, close to the lower working section baffle, and also place the surface pasted with the adhesive film facing upward.

[0036] 3. If Figure 3 As shown, the cut laminate 2 is placed against the movable baffle 3 and aligned with the reinforcing sheet 1 with the adhesive film, laid flat downward, and slightly pressed by hand.

[0037] 4. If Figure 4 As shown, the remaining two reinforcing sheets 1 are pasted with adhesive film, and the protective film / paper of the adhesive film is torn off. One of the sheets is placed against the movable baffle plate 3 and pasted on the laminate 2. At this time, the upper working section baffle bar 9 is installed, and the fixing nuts at both ends are retracted so that the lower end surface of the upper working section baffle bar 9 can be effectively pressed against the upper surface of the laminate 2. Finally, the remaining reinforcing sheet 1 is pasted on the outer side of the upper working section baffle bar 9.

[0038] 5. If Figure 5 As shown, a layer of isolation film 11 is covered on the surface of the upper reinforcing sheet 1 to prevent glue overflow during curing, causing the silicone pad 10 and the reinforcing sheet 1 to stick together. At the same time, two silicone pads 10 of the same shape and size as the reinforcing sheet 1 are placed on the surface of the isolation film 11.

[0039] 6. If Figure 6 As shown, the flat pressure head 17 is lowered to apply corresponding pressure to the reinforcing sheet 1 and the laminate 2, and quantitative pressure is implemented through a simple lever principle.

[0040] In this embodiment, the material of each part of the tooling is preferably 304 stainless steel. 304 stainless steel has the advantages of corrosion resistance, wear resistance and heat resistance. The assembled and crimped samples are placed in a small oven for heating to bond and solidify the reinforcing sheet 1 and the laminate 2, and then cut by machining equipment to form Figure 1 Finished product samples required.

[0041] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A tool for preparing a compression specimen, used for assembling a laminate (2) and a reinforcing sheet (1) of the compression specimen, characterized in that: Including an assembling mechanism and a pressurizing mechanism; The assembly mechanism comprises a work surface (5), a movable baffle (3) is adjustable in the horizontal direction on the work surface (5), a wide side of one side of the laminate (2) contacts and abuts against the movable baffle (3), a lower working section baffle and an upper working section baffle are respectively positioned on the work surface (5), the thickness of the lower working section baffle and the upper working section baffle are the same as the thickness of the reinforcing sheet (1), and the distance of the lower working section baffle relative to the upper working section baffle in the vertical direction is adjustable; The pressurizing mechanism comprises a support column (12) fixed on a work surface (5), a pressure rod (15) being hinged on the support column (12), and a first pressure column (13) and a second pressure column (14) being fixed on the pressure rod (15) pointing in the direction of the work surface (5), wherein a plane pressure sensor (18) is provided on the lower end surface of the first pressure column (13), and the lower end surface of the second pressure column (14) is arranged corresponding to the direction of the upper working section baffle bar and the lower end surface of the second pressure column (14) has a plane pressure head (17), and an adjustable weight (16) is hung below the end of the pressure rod (15) away from the hinge point, and the plane pressure head (17) is pressed against the upper reinforcing plate (1) located on the upper layer under the downward pressure of the adjustable weight (16) on the pressure rod (15), and the plane pressure sensor (18) contacts the work surface (5) and obtains a pressure signal under the downward pressure of the adjustable weight (16) on the pressure rod (15).

2. A tool for preparing a compression specimen according to claim 1, characterized in that: The reinforcing sheet (1) located on the upper layer is covered with an isolation film (11).

3. A tool for preparing a compression specimen according to claim 2, characterized in that: A silicone pad (10) is placed on the isolation film (11); the silicone pad (10) has the same shape and size as the reinforcing sheet (1); and the flat pressure head (17) is pressed onto the upper surface of the silicone pad (10).

4. A tool for preparing a compression specimen according to claim 1, characterized in that: Horizontal bolts and nuts (4) are arranged in groups on both sides of the work surface (5), and the movable baffle (3) is arranged to be adjustable in position in the horizontal direction with the work surface (5) through the horizontal bolts and nuts (4).

5. A tool for preparing a compression specimen according to claim 1, characterized in that: The work surface (5) is provided with a threaded hole at a position corresponding to the location where the lower working section baffle is positioned, and a fixing bolt (7) is connected to the thread in the threaded hole, and the lower working section baffle (8) is provided with a threaded hole that matches the fixing bolt (7); The upper working section baffle (9) is also provided with a threaded hole that cooperates with the fixing bolt (7), and a fixing nut that cooperates with the fixing bolt (7) is also provided at the corresponding threaded hole of the upper working section baffle (9), and the fixing nut positions and presses the upper working section baffle (9) in the vertical direction.

6. A tool for preparing a compression specimen according to claim 1, characterized in that: Alignment auxiliary lines (6) are respectively provided on the work surface (5) at positions corresponding to the long sides of the reinforcing sheet (1) and the positions where the long sides extend.

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