Heat-conducting gel sample manufacturing mold

Abstract

The utility model relates to a heat-conducting gel sample manufacturing die, which comprises an upper die, a middle die, a lower die and a support frame, the middle die is limited to form a through hole which penetrates along the vertical direction and is consistent with a target sample in size, the lower die comprises a bottom plate and a boss which is convexly arranged on the upper end face of the bottom plate along the vertical direction, and the middle die is fixedly arranged on the support frame. The bottom plate is located below the middle die, the boss is inserted into the through hole in a clearance fit mode, the boss and the through hole define a cavity, the bottom plate is connected to the supporting frame and can move upwards relative to the supporting frame, and the distance between the bottom plate and the bottom face of the middle die is not smaller than the depth of the cavity. The pressing plate is detachably arranged on the middle mold in a covering mode, and the mold core is movably arranged in the mold cavity. According to the die provided by the utility model, a sample wafer with a target size is directly obtained in an extrusion mode without cutting, so that the problem that the edge thickness is not uniform when a large heat-conducting gel sheet is cut is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal conductive gel sample preparation, in particular to a thermal conductive gel sample preparation mold. Background Art

[0002] With the rapid development of science and technology, various electronic and communications products are placing increasingly stringent demands on thermally conductive materials. Traditional chip heat dissipation methods using thermal pads are no longer sufficient to meet these increasing demands. Thermally conductive gels, with their thinner application thickness, can better reduce thermal resistance and enhance heat dissipation. The performance parameters of thermally conductive gels on the market vary widely, necessitating the production of fixed-size thermal gel samples to evaluate the performance of various thermally conductive gels.

[0003] Thermal conductive gel is a paste that can be compressed and extruded into shape by external force. The traditional method of making thermal conductive gel samples is to obtain large sheets of thermal conductive gel by pressing, and then cut the large sheets into multiple samples of target size by cutting. The cutting method requires high positioning accuracy to ensure that each sample remains at the target size. The operation is cumbersome, and the edge thickness will be damaged during cutting, affecting the test of the sample performance. Utility Model Content

[0004] The main purpose of the utility model is to provide a mold for making a thermal conductive gel sample, aiming to solve the problem of uneven edge thickness of the existing thermal conductive gel sample after sheeting and cutting.

[0005] To achieve the above-mentioned objectives, the utility model proposes a thermal conductive gel sample production mold, comprising an upper mold, a middle mold, a lower mold and a support frame, the middle mold is defined by a through hole that passes through vertically and is consistent with the size of the target sample, the lower mold comprises a bottom plate and a boss vertically protruding from the upper end surface of the bottom plate, the middle mold is fixed on the support frame, the bottom plate is located below the middle mold, the boss is inserted into the through hole with a clearance fit and encloses the through hole to form a cavity, the bottom plate is connected to the support frame and can move upward relative to the support frame, the distance between the bottom plate and the bottom surface of the middle mold is not less than the depth of the cavity, the upper mold comprises a pressing plate and a core vertically protruding from the lower end surface of the pressing plate, the pressing plate can be detachably covered on the middle mold, and the core is movably arranged in the cavity.

[0006] According to some embodiments of the present invention, a thickness adjustment gasket is further provided, and the thickness adjustment gasket is selectively placed on the top of the boss.

[0007] According to some embodiments of the present invention, the support frame includes a plurality of support rods, and a plurality of guide sleeves are provided on the bottom plate, and the plurality of guide sleeves are slidably mounted on each of the support rods in a one-to-one correspondence.

[0008] According to some embodiments of the present invention, each of the support rods is further provided with a limit spring for limiting the upward movement of the base plate, and each of the limit springs is arranged between the middle mold and the base plate.

[0009] According to some embodiments of the present invention, the middle mold is a polytetrafluoroethylene shell.

[0010] According to some embodiments of the present invention, the upper opening of the through hole is provided with a chamfer; and / or the lower opening of the through hole is provided with a chamfer.

[0011] According to some embodiments of the present invention, the pressing plate and the middle mold are connected by screws.

[0012] According to some embodiments of the present invention, a first observation groove is formed on the peripheral side of the pressure plate and is recessed in a direction perpendicular to the axial direction of the through hole.

[0013] According to some embodiments of the present invention, a second observation groove is formed on the peripheral side of the bottom plate and is recessed in a direction perpendicular to the axial direction of the through hole.

[0014] According to some embodiments of the present invention, the height of the boss is greater than the depth of the through hole.

[0015] The utility model has at least the following beneficial effects:

[0016] In the present invention, the middle mold is defined as having a through hole that passes through vertically and is consistent with the size of the target sample. The lower mold includes a base plate and a boss vertically protruding from the upper end surface of the base plate. The middle mold is fixed on the supporting frame. The base plate is located below the middle mold. The boss is inserted into the through hole with a clearance fit and encloses the through hole to form a cavity. The base plate is connected to the supporting frame and can move upward relative to the supporting frame. The distance between the base plate and the bottom surface of the middle mold is not less than the depth of the cavity. The upper mold includes a pressure plate and a core vertically protruding from the lower end surface of the pressure plate. The pressure plate can be detachably covered on the middle mold, and the core is movably arranged in the cavity. When making a sample, first place the support frame of the thermal conductive gel sample mold on the workbench. At this time, the bottom plate will be supported on the support frame under the action of gravity, and will be inserted into the through hole with a clearance fit to form a cavity with the through hole. Then remove the upper mold, add the thermal conductive gel material into the cavity, and then insert the core on the pressure plate with a clearance fit into the upper end opening of the through hole. Press the pressure plate downward so that the core moves close to the boss, thereby obtaining the extruded sample in the cavity. Then remove the upper mold and operate the bottom plate to move vertically upward, driving the boss to move upward to eject the sample out of the cavity, thereby directly obtaining a sample of the target size without cutting the sample. This extrusion method not only can accurately and quickly obtain the sample, but also avoids the problem of uneven thickness of the sample cutting edge when cutting large pieces of thermal conductive gel sheets. It is also worth mentioning that demolding by ejection avoids the problem of uneven thickness caused by bending during the sample removal process, thereby improving the accuracy of the sample performance test. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 An exploded schematic diagram of a mold for making a thermally conductive gel sample provided by an embodiment of the present invention;

[0019] Description of reference numerals:

[0020] 100 - Mold for making thermal conductive gel sample; 1 - upper mold; 11 - pressure plate; 12 - core; 13 - first observation slot; 2 - middle mold; 21 - through hole; 22 - cavity; 23 - chamfer; 3 - lower mold; 31 - base plate; 32 - boss; 33 - second observation slot; 4 - support frame; 41 - support rod; 42 - limit spring; 5 - thickness adjustment gasket; 6 - screw. DETAILED DESCRIPTION

[0021] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0023] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0024] The utility model provides a mold for making a thermal conductive gel sample. Figure 1 The utility model provides a specific embodiment of a mold for making a thermally conductive gel sample.

[0025] like Figure 1, including an upper mold 1, a middle mold 2, a lower mold 3 and a support frame 4, the middle mold 2 is defined by a through hole 21 that passes through vertically and is consistent with the size of the target sample, the lower mold 3 includes a bottom plate 31 and a boss 32 vertically protruding from the upper end surface of the bottom plate 31, the middle mold 2 is fixed on the support frame 4, the bottom plate 31 is located below the middle mold 2, the boss 32 is inserted into the through hole 21 with a clearance fit and encloses the through hole 21 to form a cavity 22, the bottom plate 31 is connected to the support frame 4 and can move upward relative to the support frame 4, the distance between the bottom plate 31 and the bottom surface of the middle mold 2 is not less than the depth of the cavity 22, the upper mold 1 includes a pressing plate 11 and a core 12 vertically protruding from the lower end surface of the pressing plate 11, the pressing plate 11 can be detachably covered on the middle mold 2, and the core 12 is movably arranged in the cavity 22.

[0026] In the present invention, the middle mold 2 is defined as having a through hole 21 that passes through vertically and is consistent with the size of the target sample. The lower mold 3 includes a bottom plate 31 and a boss 32 that protrudes vertically from the upper end surface of the bottom plate 31. The middle mold 2 is fixed on the support frame 4. The bottom plate 31 is located below the middle mold 2. The boss 32 is inserted into the through hole 21 with a clearance fit and encloses the through hole 21 to form a cavity 22. The bottom plate 31 is connected to the support frame 4 and can move upward relative to the support frame 4. The distance between the bottom plate 31 and the bottom surface of the middle mold 2 is not less than the depth of the cavity 22. The upper mold 1 includes a pressing plate 11 and a core 12 that protrudes vertically from the lower end surface of the pressing plate 11. The pressing plate 11 can be detachably covered on the middle mold 2, and the core 12 is movably arranged in the cavity 22. When making a sample, first place the support frame 4 of the thermal conductive gel sample making mold 100 on the workbench. At this time, the bottom plate 31 will be supported on the support frame 4 under the action of gravity, and the boss 32 will be inserted into the through hole 21 with a clearance fit and enclosed with the through hole 21 to form a cavity 22. Then remove the upper mold 1, add the thermal conductive gel material into the cavity 22, and then insert the core 12 on the pressing plate 11 into the upper end opening of the through hole 21 with a clearance fit. Press the pressing plate 11 downward so that the core 12 moves close to the boss 32, thereby obtaining the extruded sample in the cavity 22. Then remove the upper mold 1, operate the bottom plate 31 to move vertically upward, drive the boss 32 to move upward to push the sample out of the cavity 22, thereby directly obtaining a sample of the target size, and no need to cut the sample. Through this extrusion method, not only can the sample be obtained accurately and quickly, but also the problem of uneven thickness of the cutting edge of the sample when cutting large pieces of thermal conductive gel sheets is avoided. It is also worth mentioning that demolding by ejection avoids the problem of uneven thickness caused by bending during sample removal, thereby improving the accuracy of sample performance testing.

[0027] It should be noted that in the extrusion molding operation, the distance between the top of the boss 32 and the upper opening of the through hole 21, that is, the depth of the cavity 22, is a fixed value, which is the set depth. The thickness of the sample is equal to the set depth minus the height of the protrusion of the core 12.

[0028] When testing the thermal conductive gel sample, it is usually necessary to test thermal conductive gel films of different thicknesses but the same size according to the requirements of the application scenario. Therefore, in some embodiments, a thickness adjustment gasket 5 is also configured, and the thickness adjustment gasket 5 is selectively placed on the top of the boss 32. By selecting thickness adjustment gaskets 5 of different thicknesses to adjust to the set depth, samples of the same target size but different thicknesses can be obtained. Preferably, the thickness adjustment gasket 5 is made of stainless steel. Gaskets made of stainless steel can withstand greater pressure and are not easily deformed or broken. In addition, the surface of the stainless steel gasket is smooth and flat, which can ensure good sealing performance. Preferably, the top of the thickness adjustment gasket 5 is also covered with release paper to facilitate demolding. It should be noted that after the thickness adjustment gasket 5 is used, the depth is set to the distance between the top of the thickness adjustment gasket 5 and the upper opening of the through hole 21.

[0029] In some embodiments, the support frame 4 includes a plurality of support rods 41, and the bottom plate 31 is provided with a plurality of guide sleeves, which are slidably mounted on the support rods 41 in a one-to-one correspondence. The sliding fit between the support rods 41 and the guide sleeves guides the bottom plate 31 as it moves upward.

[0030] Specifically, in some embodiments, each support rod 41 is further provided with a limit spring 42 for limiting the upward movement of the base plate 31. Each limit spring 42 is disposed between the middle mold 2 and the base plate 31. This arrangement allows the limit spring 42 to limit the base plate 31 to a certain extent, thereby fixing the relative position of the boss 32 and the middle mold 2. Unless external force is applied to the base plate 31 to cause upward movement, the set depth can be maintained at a constant value, thereby avoiding affecting the molding thickness of the sample.

[0031] Specifically, in some embodiments, the middle mold 2 is a polytetrafluoroethylene shell. The shell of the middle mold 2 made of polytetrafluoroethylene has an extremely smooth surface that is not easily adhered to materials. This helps reduce sticking when the sample is demolded after molding, avoiding the problem of uneven thickness caused by sticking during sample removal, improving the accuracy of sample performance testing, and also improving demolding efficiency.

[0032] Specifically, in some embodiments, the upper opening of the through hole 21 is chamfered 23 to prevent jamming with the upper opening when the core 12 squeezes the thermally conductive gel. The lower opening of the through hole 21 is also chamfered 23. This arrangement prevents jamming between the boss 32 and the lower opening when the base plate 31 moves the boss 32 upward for demolding. Either chamfer 23 on the upper or lower opening can be used, with both options offering greater effectiveness.

[0033] It is understandable that when extrusion molding is performed on a gel material of conventional viscosity, a sample of target thickness can be obtained by directly pressing down the pressing plate 11. However, when a gel material with very high viscosity needs to be processed, a greater downward force needs to be provided. Therefore, in some embodiments, the pressing plate 11 and the middle mold 2 are connected by screws 6. When extruding a gel material with very high viscosity, the pressing plate 11 and the middle mold 2 are squeezed by rotating the screw 6, and the pressure is applied by rotating the screw 6, which can provide a greater and more stable extrusion force to obtain a sample that meets the inspection requirements. Preferably, the screw 6 includes a hexagon socket screw 6, and a hexagon socket wrench can better provide sufficient torque. It is understandable that the number of the screws 6 can be set to multiple and arranged at intervals. Through this setting, the insertion depth of each screw 6 can be adjusted to achieve the function of leveling the pressing plate 11.

[0034] Specifically, in some embodiments, a first observation groove 13 is formed on the peripheral side of the pressure plate 11 and is recessed in a direction perpendicular to the axial direction of the through hole 21. The first observation groove 13 facilitates observation of the alignment of the core 12 and the upper end opening, thereby making adjustments based on the observation situation.

[0035] Specifically, in some embodiments, a second observation slot 33 is formed on the circumference of the bottom plate 31 and is recessed in a direction perpendicular to the axial direction of the through hole 21. The second observation slot 33 facilitates observation of the alignment between the boss 32 and the lower end opening, thereby making adjustments based on the observation.

[0036] Specifically, in some embodiments, the height of the boss 32 is greater than the depth of the through hole 21. With this arrangement, when the operating base 31 moves upward, the boss 32 can be driven upward to protrude from the upper opening of the through hole 21, thereby completely ejecting the sample and improving the demolding effect.

[0037] The embodiment of the thermal conductive gel sample production mold 100 during sample production operation is as follows:

[0038] Example 1:

[0039] Thermal gel oil permeability test specimens were prepared. The specimen dimensions required were circular, 25.4 mm in diameter, and 1 mm thick. A middle mold 2 with a through-hole 21 of 25.4 mm diameter was selected. The core 12 of the upper mold 1 was set to a height of 1 mm and a depth of 3 mm (the distance from the top of the boss 32 to the upper opening of the through-hole 21, i.e., the depth of the cavity 22, was a fixed value determined by the depth of the core 12). The required depth was determined by adjusting the distance the core 12 fits within the through-hole 21. A certain thermal gel had a density of 3.1 g / cm³ and a volume of 6.45 cm². The calculated mass of the thermal gel was 20 g.

[0040] The specific operation is to remove the upper mold 1, place a 1mm thick thickness adjustment gasket 5 on the boss 32 in the cavity 22, and place release paper on it, weigh 20g of thermal conductive gel sample on the top of the thickness adjustment gasket 5, cover it with release paper and embed the core 12 in the upper end opening, press down the pressing plate 11, and thus obtain a circular sheet with a diameter of 25.4 and a thickness of 1mm; then remove the upper mold 1, operate the bottom plate 31 to move upward, so as to drive the boss 32 to push the sample out of the cavity 22, and the thermal conductive gel sample can be taken out.

[0041] Example 2:

[0042] Preparation of test samples of thermal conductivity and thermal resistance of thermal conductive gel with different thicknesses. The sample size is required to be a circle with a diameter of 25.4mm and a thickness of 0.5mm\1mm / 1.5mm;

[0043] Step 1: Prepare a thermal conductive gel sample with a diameter of 25.4 mm and a thickness of 1 mm according to the method in Example 1;

[0044] Step 2: Use the thermal conductive gel sample used in Step 1 to make a mold 100, and follow the molding method of Example 1, but use a thickness adjustment spacer 5 with a thickness of 1.5 mm to obtain a thermal conductive gel sample with a diameter of 25.4 mm and a thickness of 0.5 mm;

[0045] Step 3: Continue to use the thermal conductive gel sample used in the first step to make the mold 100, and follow the molding method in Example 1 but select the thickness adjustment gasket 5 with a thickness of 0.5 mm to obtain a thermal conductive gel sample with a diameter of 25.4 mm and a thickness of 1.5 mm.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A mold for making a thermally conductive gel sample, characterized in that: The mold is composed of an upper mold, a middle mold, a lower mold and a support frame. The middle mold is defined by a through hole that passes through vertically and is consistent with the size of the target sample. The lower mold includes a bottom plate and a boss vertically protruding from the upper end surface of the bottom plate. The middle mold is fixed on the support frame. The bottom plate is located below the middle mold. The boss is inserted into the through hole with a clearance fit and encloses the through hole to form a cavity. The bottom plate is connected to the support frame and can move upward relative to the support frame. The distance between the bottom plate and the bottom surface of the middle mold is not less than the depth of the cavity. The upper mold includes a pressing plate and a core vertically protruding from the lower end surface of the pressing plate. The pressing plate can be detachably covered on the middle mold, and the core is movably arranged in the cavity.

2. The thermal conductive gel sample production mold according to claim 1, characterized in that: A thickness adjustment gasket is also provided and is selectively placed on the top of the boss.

3. The thermal conductive gel sample production mold according to claim 1, characterized in that: The support frame includes a plurality of support rods. The bottom plate is provided with a plurality of guide sleeves. The plurality of guide sleeves are slidably sleeved on the support rods in a one-to-one correspondence.

4. The thermal conductive gel sample production mold according to claim 3, characterized in that: Each of the support rods is also provided with a limit spring for limiting the upward movement of the base plate, and each of the limit springs is arranged between the middle mold and the base plate.

5. The thermal conductive gel sample production mold according to claim 1, characterized in that: The middle mold is a polytetrafluoroethylene shell.

6. The thermal conductive gel sample production mold according to claim 1, wherein: The upper opening of the through hole is chamfered; and / or the lower opening of the through hole is chamfered.

7. The thermal conductive gel sample production mold according to claim 1, characterized in that: The pressing plate and the middle mold are connected by screws.

8. The thermal conductive gel sample production mold according to claim 1, wherein: A first observation groove is formed on the peripheral side of the pressing plate and is recessed in a direction perpendicular to the axial direction of the through hole.

9. The thermal conductive gel sample production mold according to claim 1, wherein: A second observation groove is formed on the peripheral side of the bottom plate and is recessed in a direction perpendicular to the axial direction of the through hole.

10. The thermal conductive gel sample production mold according to claim 1, wherein: The height of the boss is greater than the depth of the through hole.

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