CN219191312U

CN219191312U - Hot pressing jig

Info

Publication number: CN219191312U
Application number: CN202320746767.3U
Authority: CN
Inventors: 朱齐备
Original assignee: Stats Chippac Semiconductor Jiangyin Co Ltd
Current assignee: Stats Chippac Semiconductor Jiangyin Co Ltd
Priority date: 2023-04-07
Filing date: 2023-04-07
Publication date: 2023-06-16
Anticipated expiration: 2033-04-07

Abstract

The utility model discloses a hot pressing jig, which comprises a hot pressing jig and a hot pressing jig, wherein the hot pressing jig is used for supporting a product carrier and heating a product to be hot pressed, the product carrier is provided with a product bearing part and a pressing through hole, the product carrier is used for bearing the product to be hot pressed, the hot pressing jig comprises an upper surface, a pressing protruding part protruding relative to the upper surface and a heat insulation part arranged on the upper surface, when the hot pressing jig is used for hot pressing the product to be hot pressed, the pressing protruding part can pass through the pressing through hole to be in contact with the bottom surface of a substrate of the product to be hot pressed, and the heat insulation part can block the product carrier from being in contact with the upper surface. The hot pressing jig provided by the utility model can prevent the substrate of the product to be hot pressed from shifting relative to the heat radiating cover due to outward expansion of the product carrier caused by heating in the hot pressing process, so that the packaging yield can be obviously improved.

Description

Hot pressing jig

Technical Field

The utility model relates to the technical field of hot pressing processes, in particular to a hot pressing jig.

Background

Some electronic devices can generate a large amount of heat in the working process, and the heat dissipation efficiency of the electronic devices can be improved by installing the heat dissipation cover at the top of the electronic devices, so that the performance of the electronic devices is prevented from being influenced by overhigh temperature. The heat-dissipating cover is typically attached to the top of the electronic device by a thermal compression process. In the hot pressing process, the product including the heat-dissipating cover and the electronic device substrate (hereinafter referred to as "substrate") after the dispensing and the mounting are completed is hot pressed by the hot pressing jig, so that the heat-dissipating cover, the electronic device and the substrate are firmly bonded together.

The hot press jig for the hot press process generally includes a hot press upper jig and a hot press lower jig. In the conventional hot pressing process, the product to be hot pressed after the dispensing and the planting are finished is placed on a product carrier, and positioning pins on the product carrier limit the position of the substrate and prevent the substrate from moving. After the product carrier is transported to the hot pressing area of the hot pressing jig through the transport component, the jig under hot pressing moves relatively towards the direction of the jig on the hot pressing, contacts with the substrate at the bottom of the product, supports the product and heats the product. Then, the hot pressing jig applies pressure to the heat dissipating cover, thereby bonding the heat dissipating cover to the substrate.

In the hot pressing process, the product carrier is always in contact with the upper surface of the hot pressing jig, and the upper surface of the hot pressing jig is always in a high-temperature state, so that the product carrier is heated and expanded in the hot pressing process, the positioning needle moves outwards along with the expansion of the product carrier and possibly interferes with the substrate, the relative position of the substrate of a product to be hot pressed and the heat dissipation cover is offset, and the packaging yield is low.

Disclosure of Invention

An object of the present application is to provide a hot pressing jig, to above-mentioned problem, improve current hot pressing jig, the expansion degree of product carrier in the greatly reduced hot pressing process makes the base plate of waiting hot pressing product and the relative position offset greatly reduced of heat dissipation lid to improve the yields of product.

The utility model provides a hot pressing jig, which comprises a hot pressing jig and a hot pressing jig, wherein the hot pressing jig is used for supporting a product carrier and heating a product to be hot pressed, the product carrier is provided with a product bearing part and a pressing through hole, the product bearing part is used for bearing the product to be hot pressed, and the hot pressing jig comprises: an upper surface; when the hot pressing fixture performs hot pressing on the product to be hot pressed, the pressing protruding part protrudes relative to the upper surface and can penetrate through the pressing through hole to be in contact with the bottom surface of the substrate of the product to be hot pressed; and the heat insulation piece is arranged on the upper surface, and can prevent the product carrier from contacting with the upper surface when the hot pressing jig performs hot pressing on the product to be hot pressed.

The height difference between the pressing protruding portion and the heat insulation piece relative to the upper surface is equal to the thickness of the product carrier.

Optionally, the heat insulating piece includes stiff end and supporting end, the heat insulating piece passes through the stiff end is fixed on the upper surface, the supporting end when hot pressing fixture carries out hot pressing to waiting for hot pressing product with the product carrier supports.

Optionally, the top of the supporting end is a plane or an upward convex curved surface.

Optionally, the support end is fixed to the fixed end by threads.

Optionally, the fixed end is fixed to the upper surface by a screw thread.

Optionally, the thermal insulation is made of a material having a thermal conductivity lower than 70W/(m·k).

Optionally, the hot pressing upper fixture is provided with a compression rod applying vertical downward thrust to the product carrier, the upper surface is provided with a telescopic supporting spring pin for supporting the product carrier, the compression rod can apply thrust to the product carrier, and the product carrier and the supporting spring pin are pushed to move towards the vertical downward direction, so that the pressing protruding portion is contacted with the product to be hot pressed.

Optionally, the hot pressing upper fixture is provided with a pressing weight for performing hot pressing on the product to be hot pressed, the pressing weight comprises a holding state and a releasing state, and when the pressing protruding portion contacts with the bottom surface of the substrate of the product to be hot pressed, the pressing weight changes from the holding state to the releasing state, so that pressure is applied to the top of the product to be hot pressed.

Optionally, the number of the compression bars is plural, and each compression bar is aligned with one of the heat insulating members in the center in the vertical direction.

The beneficial effects of the utility model include: the heat insulation piece is arranged on the upper surface of the jig under hot pressing, so that direct contact between the product carrier and the upper surface of the jig under hot pressing is avoided, the heating mode of the product carrier is changed from heat conduction to heat radiation, the heat transfer efficiency is reduced, the purpose of controlling the heating expansion amplitude of the product carrier is achieved, and the parts of the product to be hot pressed are kept in an acceptable displacement range, so that the packaging yield is improved. In addition, the heat insulation device has the advantages of simple structure, good heat insulation effect and no influence on other steps of the hot pressing process.

Drawings

Fig. 1 is a schematic diagram showing a structure of a hot press jig in the prior art;

FIG. 2 illustrates a top view from above and down from above the product carrier 2 after the product carrier 2 is carried by the hot pressing jig of an embodiment of the present disclosure;

FIG. 3 is a cross-sectional view of the thermocompression tool of the embodiment of the present disclosure taken along the direction A-A shown in FIG. 2 in a first state of the thermocompression process;

FIG. 4 is a cross-sectional view along A-A of FIG. 2 when the thermocompression bonding tool according to the embodiment of the present disclosure is in a second state of the thermocompression bonding process;

fig. 5 is a cross-sectional view of the thermocompression bonding tool according to the embodiment of the present disclosure along the direction A-A shown in fig. 2 in a third state of the thermocompression bonding process.

The marks in the figure:

1. a hot pressing jig; 101. pressing the protruding part; 102. an upper surface; 103. a product carrying part; 2. a product carrier; 201. a positioning needle; 202. pressing the through hole; 3. a substrate; 4. and (3) sticking glue; 5. a heat-dissipating cover; 6. pressurizing the block; 7. a compression rod; 8. a heat insulating member; 9. a support spring pin; 10. a product to be hot pressed; 11. pressing the weight blocks; 12. and (5) pressing the jig by hot pressure.

Detailed Description

For the convenience of those skilled in the art to understand the present application, the following detailed description is made with reference to the examples and drawings. In the drawings, like reference numerals generally refer to like elements unless the context indicates otherwise. The illustrative embodiments described in the detailed description, drawings, and claims are not limiting of the application. Other embodiments may be utilized, and other changes may be made, without departing from the spirit or scope of the subject matter of the present application. It will be readily understood that the aspects of the present application, as generally described herein, and illustrated in the figures, could be arranged, substituted, combined, and designed in a wide variety of different configurations, all of which are explicitly contemplated as part of this application.

Other variations to the disclosed embodiments can be understood and effected by those skilled in the art from a reading of the specification, the disclosure, and the drawings, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the terms "a" and "an" do not exclude a plurality. In the practice of the present application, one part may perform the functions of a plurality of technical features recited in the claims. Any reference signs in the claims shall not be construed as limiting the scope.

Fig. 1 is a schematic structural diagram of a prior art hot press jig when hot pressing is performed, and a process of hot-pressing a product to be hot-pressed using the hot press jig will be briefly described with reference to fig. 1. The product to be hot pressed is carried on the product carrier, and adhesive is preset between an upper layer component (such as a heat dissipation cover) and a lower layer component (such as a substrate) of the product to be hot pressed. The product carrier is provided with a positioning needle which is used for limiting the product to be hot pressed. When the hot pressing is implemented, the jig under the hot pressing slowly rises to drive the product carrier to move from bottom to top and gradually props against the pressing block on the jig under the hot pressing. In the prior art, the product carrier contacts with the upper surface of the jig under hot pressing, the temperature of the jig under hot pressing is higher, the product carrier is caused to be heated and expanded, the expansion of the product carrier drives the positioning needle to move to the outer side of the product carrier, the relative position of the lower layer part and the uppermost layer part in the positioning needle is changed, and poor packaging is easily caused.

In order to reduce adverse effects of thermal expansion of a product carrier on yield in a hot pressing process, the utility model provides a hot pressing jig.

Fig. 2 to 5 show schematic views of the hot press jig of the embodiment of the present disclosure in different states or at different angles.

Fig. 2 is a top view of the product carrier 2 from above to below after the product carrier 2 is carried by the hot press tool according to the embodiment of the present disclosure, in which the heat insulation member 8 blocked by the product carrier 2 is indicated by a dotted line, and the product 10 to be hot pressed is also indicated by a dotted line. Fig. 3 illustrates a cross-sectional view along A-A direction shown in fig. 2 when the thermocompression bonding tool according to an embodiment of the present disclosure is in a first state of the thermocompression bonding process, fig. 4 illustrates a cross-sectional view along A-A direction shown in fig. 2 when the thermocompression bonding tool is in a second state of the thermocompression bonding process, and fig. 5 illustrates a cross-sectional view along A-A direction shown in fig. 2 when the thermocompression bonding tool is in a third state of the thermocompression bonding process. The first state of the hot pressing process refers to a situation that the product carrier 2 is placed on the hot pressing jig 1, the hot pressing jig 1 and the hot pressing jig 12 do not start to move relatively, and the upper surface 102 of the hot pressing jig 1 and the hot pressing jig 12 are kept at a certain distance from the product carrier 2; the second state of the hot pressing process refers to the relative movement of the hot pressing lower jig 1 and the hot pressing upper jig 12, the hot pressing upper jig 12 pushes the product carrier 2 to move towards the upper surface 102 of the hot pressing lower jig 1 until the pressing block 6 of the hot pressing upper jig 12 contacts with the heat dissipation cover 5, and the product carrier 2 is propped against the heat insulation piece 8; the third state of the thermal compression process refers to the situation that the thermal compression fixture 1 and the thermal compression fixture 12 cannot continue to move relatively, and the pressing weights 11 of the thermal compression fixture 12 press the product 10 to be pressed through the pressing block 6 and keep the thermal compression state.

As shown in fig. 2 to 5, the hot press jig of the present disclosure includes a hot press jig 12 and a hot press jig 1, the hot press jig 1 is used for supporting a product carrier 2 and heating a product 10 to be hot pressed, and applies pressure to the product 10 to be hot pressed in cooperation with a pressing block 6 of the hot press jig 12. The product carrier 2 has a product carrying portion 103 for carrying the product 10 to be hot pressed and a press through hole 202, and the product carrying portion 103 is generally disposed around the press through hole 202 for providing support to the product 10 to be hot pressed.

The hot pressing jig 1 includes an upper surface 102, a press-fitting boss 101, and a heat insulator 8.

The upper surface 102 is generally a plane parallel to the horizontal direction, and in the working state, the upper surface 102 is in a high temperature state due to the heating of the hot pressing jig 1.

The shape of the press-fit protrusion 101 is matched with the shape of the press-fit through hole 202, and reference is made to fig. 2. When the under-heat pressing jig 1 moves upward to heat and press the product 10 to be heat and pressed, the pressing protrusion 101 of the under-heat pressing jig 1 may pass through the pressing through hole 202 to contact with the bottom surface of the substrate 3 of the product 10 to be heat and pressed with the pressing block 6 of the under-heat pressing jig 12 located directly above.

The heat insulating member 8 is a protrusion with respect to the upper surface 102, and when the hot press jig performs hot pressing on the product 10 to be hot pressed, the heat insulating member 8 can block the product carrier 2 from contacting the upper surface 102, thereby reducing the heat obtained from the upper surface 102 by the product carrier 2.

The hot press process using the hot press tool of the present disclosure may refer to fig. 3 to 5. In the state shown in fig. 3, the supporting spring pin 9 of the hot pressing jig 1 carries the product carrier 2, and the product 10 to be hot pressed is placed on the product carrier 2 and limited by the positioning needle 201; the pressing convex part 101 of the hot pressing jig 1 is positioned below the product carrier 2, and a certain distance exists between the pressing convex part and the product carrier 2; the pressing block 6 of the hot pressing jig 12 is located above the product carrier 2 with a predetermined distance therebetween. The hot pressing jig 1 and the hot pressing upper jig 12 move relatively, the compression rod 7 of the hot pressing upper jig 12 applies thrust to the product carrier 2, the supporting spring pin 9 of the hot pressing lower jig 1 contracts after being stressed, the product carrier 2 moves towards the hot pressing jig 1 until the product carrier 2 falls onto the hot pressing jig 1 in the state shown in fig. 4, but due to the heat insulation piece 8, the product carrier 2 is supported by the heat insulation piece 8 and keeps a certain distance from the upper surface of the hot pressing lower jig 1. The hot pressing jig 1 and the hot pressing jig 12 continue to move relatively until the state shown in fig. 5, the hot pressing jig 1 and the hot pressing jig 12 cannot move relatively continuously, the pressing convex part 101 of the hot pressing jig 1 and the pressing block 6 of the hot pressing jig 12 are respectively abutted against the substrate and the heat dissipation cover of the product 10 to be hot pressed, the pressing weight 11 of the hot pressing jig 12 is released, and the product 10 with hot pressing is pressed and maintained for a period of time through the pressing block 6.

The hot pressing jig provided in this embodiment solves the foregoing technical problems in the prior art by the following principle: by arranging the heat insulation piece 8 on the upper surface of the hot pressing jig 1, a certain distance is kept between the product carrier 2 and the upper surface of the hot pressing jig 1, and direct contact is avoided, so that heat conducted from the hot pressing jig 1 to the product carrier 2 is reduced, the deformation of the product carrier 2 due to thermal expansion is reduced, the relative displacement between the uppermost part and the lowermost part of the product 10 to be hot pressed is further kept, and the packaging yield is improved.

Optionally, the height difference between the press-fit protrusion 101 and the heat shield 8 with respect to the upper surface 102 is equal to the thickness of the product carrier 2. Specifically, the top of the pressing protruding portion 101 is flush with the upper surface of the product carrier 2, when the hot pressing upper jig 12 and the hot pressing lower jig 1 perform hot pressing on the product, the product 10 to be hot pressed always does not leave the product carrier 2, and the problem that the relative positions of the lower layer component and the uppermost layer component are changed due to the position movement of the product 10 to be hot pressed is avoided, so that adverse effects are caused on the packaging quality of the product.

The heat insulating member 8 includes a fixed end and a support end. The heat insulating member 8 is fixed on the upper surface 102 through a fixing end, and the supporting end is propped against the product carrier 2 when the hot pressing jig performs hot pressing on the product 10 to be hot pressed, so as to provide supporting force for the product carrier 2.

In some embodiments, the top of the support end is planar, so that stable support can be provided for the product carrier. In other embodiments, the top of the support end is convexly curved to reduce the contact area between the product carrier 2 and the insulation 8 and thereby reduce the heat transfer efficiency.

Optionally, the supporting end and the fixing end are respectively provided with an internal thread and an external thread which are matched with each other, so that the supporting end can be fixed on the fixing end through threads.

Optionally, external threads may be provided on the fixed end, and screw holes may be provided on the upper surface 102, through which the fixed end may be secured to the upper surface 102.

By adopting the technical scheme, the damaged or worn heat insulation part 8 can be replaced wholly or partially conveniently, so that the product carrier 2 can be kept in a good supporting state, and the problem that the product carrier 2 is inclined and the like due to the wear of the heat insulation part 8 to influence the yield of product packaging is avoided.

In order to further reduce the heat conduction between the hot pressing jig 1 and the product carrier 2, alternatively, the heat insulator 8 may use a material having a low thermal conductivity, for example, a material having a thermal conductivity lower than 70W/(m·k).

Optionally, the hot pressing upper fixture 12 is provided with a plurality of compression rods 7 applying vertical downward thrust to the product carrier 2, as shown in fig. 3, the plurality of compression rods 7 are distributed at corresponding positions of the hot pressing fixture in a dispersed manner, so as to ensure that the product carrier 2 maintains a stable state in the hot pressing process, and avoid poor packaging caused by inclination. The hot pressing jig 1 is provided with a plurality of retractable support spring pins 9 penetrating the upper surface 102, one possible structure of the support spring pins 9 can be seen with reference to fig. 3, the support spring pins 9 being used for supporting the product carrier 2. The compression bar 7 may apply a pushing force to the product carrier 2, pushing the product carrier 2 and the supporting spring pins 9 to move in a vertically downward direction, thereby bringing the press-fit protrusions 101 into contact with the substrate of the product 10 to be hot-pressed.

Optionally, the number of the heat insulating pieces 8 is multiple, and each compression rod 7 is aligned with one heat insulating piece 8 along the center of the vertical direction, so that the thrust of the compression rod 7 to the product carrier 2 can be directly born by the heat insulating pieces 8, and the deformation and bending of the product carrier 2 under the thrust of the compression rod 7 during the hot pressing are avoided, and the hot pressing effect is influenced. Optionally, the heat insulation pieces 8 are disposed at the periphery of the pressing protruding portion 101 and distributed in a matrix, so that the stress of the product carrier 2 is more uniform, and bending deformation of the product carrier 2 due to uneven stress is further avoided.

Optionally, the compression rod 7 is connected with the hot pressing upper jig 12 through a spring, and by adopting the technical scheme, after the compression rod 7 contacts the product carrier 2, in the process of applying thrust to the product carrier 2, the spring connecting the compression rod 7 and the hot pressing upper jig 12 is gradually compressed, so that the thrust of the compression rod 7 is gradually applied to the product carrier 2 from small to large, and the impact force to the product carrier 2 is reduced.

Alternatively, as shown in fig. 3 to 5, the hot pressing jig 12 is provided with a pressing weight 11 for performing hot pressing of the product 10 to be hot pressed. The pressing weight 11 includes a holding state and a releasing state, and the pressing weight 11 is in the holding state before the pressing protrusion 101 contacts the bottom surface of the base plate 3 of the product 10 to be hot pressed. After the press-fit protrusion 101 comes into contact with the bottom surface of the substrate 3 of the product 10 to be heat-pressed, the press-fit weight 11 is changed from the holding state to the releasing state, thereby applying pressure to the top of the product 10 to be heat-pressed. After the press-fitting is completed, the press-fitting weight 11 is changed from the released state to the held state, and no pressure is applied to the top of the product to be hot-pressed 10. Wherein the weight of the pressing weight 11 can be adjusted according to different pressing support requirements.

According to the technical scheme, the heat insulation piece 8 is arranged on the upper surface of the hot pressing jig 1, so that direct contact between the product carrier 2 and the upper surface 102 of the hot pressing jig 1 is avoided, heat of the upper surface 102 of the hot pressing jig 1 is prevented from being directly conducted to the product carrier 2, the purpose of controlling the thermal expansion amplitude of the product carrier 2 is achieved, and all parts of a product 10 to be hot pressed are kept in an acceptable displacement range, so that the packaging yield is improved. In addition, the technical scheme of the present disclosure has the advantages of simple structure, good heat insulation effect, and no influence on other steps of the hot pressing process.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be a direct contact between the first feature and the second feature, or an indirect contact between the first feature and the second feature through an intervening medium. Moreover, a first feature "above," "over" and "on" a second feature may be a first feature directly above or obliquely above the second feature, or simply indicate that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is at a lower level than the second feature.

In the description of the present specification, reference to the description of the terms "one embodiment," "some embodiments," "examples," "particular examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims

1. The utility model provides a hot pressing tool, it includes hot pressing tool and hot pressing jig, hot pressing jig is used for supporting the product carrier and treats hot pressing product heating down, the product carrier has and is used for bearing treat hot pressing product's product carrier part and pressfitting through-hole, its characterized in that, the jig includes under the hot pressing:

an upper surface;

when the hot pressing fixture performs hot pressing on the product to be hot pressed, the pressing protruding part protrudes relative to the upper surface and can penetrate through the pressing through hole to be in contact with the bottom surface of the substrate of the product to be hot pressed; and

the heat insulation piece is arranged on the upper surface, and can prevent the product carrier from contacting with the upper surface when the hot pressing jig performs hot pressing on the product to be hot pressed.

2. The heat press jig according to claim 1, wherein a height difference between the press-fit protrusion and the heat insulating member with respect to the upper surface is equal to a thickness of the product carrier.

3. The heat press jig according to claim 1, wherein the heat insulating member includes a fixed end and a supporting end, the heat insulating member is fixed on the upper surface through the fixed end, and the supporting end abuts against the product carrier when the heat press jig performs heat press on the product to be heat-pressed.

4. The heat press jig of claim 3, wherein the top of the support end is a flat surface or an upwardly convex curved surface.

5. The heat press jig of claim 3, wherein the support end is secured to the fixed end by threads.

6. The heat press jig of claim 3, wherein the fixed end is secured to the upper surface by threads.

7. The heat press jig according to claim 1, wherein the heat insulating member is made of a material having a thermal conductivity lower than 70W/(m-K).

8. The hot press jig according to claim 1, wherein the hot press upper jig is provided with a compression bar applying a vertical downward pushing force to the product carrier, the upper surface is provided with a retractable support spring pin for supporting the product carrier, the compression bar can apply a pushing force to the product carrier, and the product carrier and the support spring pin are pushed to move in a vertical downward direction, so that the press-fit protrusion is brought into contact with the product to be hot pressed.

9. The heat press jig according to claim 8, wherein the heat press upper jig is provided with a press weight for performing heat press on the product to be heat pressed, the press weight including a holding state and a release state, the press weight being changed from the holding state to the release state when the press protrusion is in contact with a substrate bottom surface of the product to be heat pressed, thereby applying pressure to a top of the product to be heat pressed.

10. The heat press fixture of claim 8, wherein the number of compression bars and heat shields is a plurality, each compression bar being centrally aligned with one of the heat shields in a vertical direction.