CN220354239U

CN220354239U - Fixing element with reworking function and reworking tool thereof

Info

Publication number: CN220354239U
Application number: CN202321097883.3U
Authority: CN
Inventors: 蓝文基
Original assignee: Asia Vital Components Co Ltd
Current assignee: Asia Vital Components Co Ltd
Priority date: 2023-05-09
Filing date: 2023-05-09
Publication date: 2024-01-16
Anticipated expiration: 2033-05-09

Abstract

The utility model relates to a fixing element with a reworking function and a reworking tool thereof, comprising: a screw, a sleeve and a clamping spring coil; the screw is provided with a screw head and a plurality of outer screw teeth at two ends, the screw head is provided with two notches, the screw is externally sleeved with a spring and is penetrated in the sleeve together, and a retaining ring is clamped at the lower end of the screw and used as a limit of the lower end of the spring to prevent the spring from falling off; the end part of the sleeve is concavely provided with a pair of windows, and the sleeve body is provided with a combination area; the snap spring ring is provided with an upward extending hook arm group which is sleeved on the combining area, and the tail ends of the pair of hook arms extend into the top end of the spring from the window and buckle the top end of the spring, so that the spring is in a compressed state in the sleeve; when the spring of the fixing element is released after assembly, the two ends of the spring are respectively propped up and pressed down to provide uniform downward pressure to complete assembly; in addition, if the installation is to be carried out again, the notch of the screw head is used for pressing the spring downwards, so that the installation and the use can be provided again.

Description

Fixing element with reworking function and reworking tool thereof

Technical Field

The present utility model relates to a fixing element with reworking function, and more particularly to a fixing element with reworking function which can provide uniform downward force to avoid damage or thermal resistance caused by uneven contact stress between a bare die operation unit and a heat dissipation device, and can be assembled again by matching with a reworking tool.

Background

In order to provide the high-efficiency operation capability of the electronic equipment, a high-efficiency high-power wafer is adopted, when the wafer is operated, quite high heat is generated, the exterior of the traditional operation wafer is provided with a packaging shell, the wafer is wrapped in the packaging shell, the wafer is protected from being damaged, and as the operation capability of the wafer is improved, the wafer generates higher temperature than the traditional operation, and the heat dissipation and the heat conduction efficiency of the wafer are seriously influenced by the packaging shell packaged outside the wafer; therefore, most of the chips in the market are changed into bare chips, and the surface of the bare chips is not provided with a protective packaging shell, so that the heat exchange contact surface is small, the surface is not a flat surface, and the strength of the bare chips is relatively low because of the lack of the protection of the outer packaging shell, therefore, the bare chips are easy to crack when being combined with a heat dissipating device,

therefore, when the heat dissipating device is fixed above the heat source (bare die), the heat source cannot be directly combined with the heat dissipating device, so that the problem of wafer breakage and the like can be caused by setting up locking points with internal threads as supports on a substrate (motherboard or circuit board) provided with the heat source, and the locking points are located in directions opposite to four corners of the outer side of the heat source, if the traditional single locking points are adopted for sequential locking, the first locking position is inclined, and the bare die cannot bear uneven pressure.

Referring to fig. 1 and 2, a conventional heat dissipating device and bare die assembly is shown, the heat source a is disposed on a substrate, copper columns B with internal threads are disposed at four corners of the substrate corresponding to the outer side of the heat source a, four holes C3 are disposed at the positions of the heat dissipating device C corresponding to the copper columns B, and screw units C1 are respectively disposed on the heat dissipating device C, a spring C2 is sleeved outside the screw units C1, and when the heat dissipating device C and the heat source a are fastened, the electric screwdriver is operated by a manual or mechanical arm to directly perform a screwing operation, so as to accelerate assembly time on a production line and complete the assembly time, and each screw is usually fastened in place at a fast and once.

Furthermore, the bare die is fragile, and as described above, the bonding force must be provided by the four corners of the bare die at the same time by a uniform downward pressure, if the downward pressing force cannot be provided by the four corners of the bare die at the same time in an average stress manner, the heat spreader or the heat dissipating device is easy to warp, adhere to the heat source (bare die) completely or damage, and the like, and the heat resistance is easy to be formed, that is, the phenomenon of uneven heating or failure of heat conduction can occur.

In addition, an operator provides a heat dissipation device matched with a spring screw to be combined with a heat source in a bare crystal form, so that the defect that uniform downward pressure cannot be provided at the same time is overcome, the spring screw is different from a common spring screw, a screw sleeve is additionally sleeved outside a screw body of the spring screw and the spring, a spring limiting element is additionally arranged outside the screw sleeve, the spring can be temporarily compressed in the screw sleeve through the spring limiting element, after the spring limiting element is damaged through an implement or a hand tool, the spring which is originally compressed and limited in the screw sleeve can be synchronously released, the spring tension auxiliary heat dissipation device provided at the two ends of the spring can provide the upward and downward pressure for the heat source, the spring screw can provide spring elasticity through the spring to be used as an adjusting or auxiliary downward pressing force, the spring limiting element which limits the spring elasticity can only be used, after the spring limiting element is damaged, the spring is released, the spring can be temporarily compressed in the screw sleeve, after the spring limiting element is released, the spring limiting element can be reset, the spring can not be replaced by the spring limiting element, and the spring can be replaced by the spring can not be replaced by the spring, and the heat dissipation device can be replaced by the new heat dissipation device after the spring is replaced by the new heat dissipation device, and the user can be replaced by the need to be replaced by the new heat dissipation device.

Therefore, how to improve the heat dissipation device, which can be completely and comprehensively synchronized, and provide even pressure to be tightly attached to the heat source, and how to provide the effects of maintaining proper binding force between the bare die and the heat dissipation device, and repeatedly installing or adjusting the bare die and the heat dissipation device, is a primary problem for industry.

Disclosure of Invention

Therefore, in order to effectively solve the above-mentioned problems, the main objective of the present utility model is to provide a fixing element with rework function and a rework tool thereof, which can provide synchronous and uniform pressing force, and effectively avoid the effect of cracking or chipping the corners of the bare die operation unit caused by the prior locking of a single locking point.

The utility model provides a fixing element with a reworking function, which is used for fixing a heat dissipating device to a bare-die heat source in a repeatable installation and use way, and is characterized in that: comprising the following steps:

the screw is externally sleeved with a spring, the upper end and the lower end of the screw are respectively provided with a screw head and a plurality of outer threads, the screw head is penetrated with two notches along the axial direction of the screw, the screw is provided with a retaining ring accommodating groove adjacent to the plurality of outer threads, the retaining ring accommodating groove is provided with a retaining ring in a clamping way, the spring is provided with a top end and a bottom end, and the bottom end is abutted against the retaining ring;

the sleeve is provided with an upper end and a lower end which are open, a containing space is arranged between the upper end and the lower end, the containing space is respectively communicated with the upper end and the lower end, a pair of windows are arranged at the position, close to the upper end, of the sleeve, the windows correspond to each other and are communicated with the containing space, a combining area is arranged between the lower edge of the window and the lower end of the sleeve, and the sleeve is sleeved outside the screw through which the spring is arranged;

the clamping spring coil is sleeved on the combining area of the sleeve, and extends upwards to form a hook arm group, the hook arm group is provided with a pair of hook arms, and the pair of hook arms extend into the top end of the spring for pressing and buckling respectively from the window to enable the spring to be in a compressed state; when the heat dissipating device and the heating element are installed, the hook arm is operated to withdraw from the window to release the spring, so that a synchronous and uniform downward pressure is provided;

when the screw is to be reworked, the two notches of the screw head extend into a jig to axially press the top end of the spring downwards, so that the spring is compressed in the sleeve, and the pair of hook arms extend into the sleeve window to press the top end of the spring again, so that the spring is restored to a compressed state.

The fixing element with the reworking function comprises: the screw head has an upper end face and a lower end face, and the two notches penetrate through the upper end face and the lower end face of the screw head at the same time.

The fixing element with the reworking function comprises: the tail ends of the free ends of the hook arms are inwards bent to form a hook end, the hook end stretches into the accommodating space of the sleeve from the window, the pair of windows are provided with an upper edge, the upper side surfaces of the hook ends are propped against the upper edge, and the upper edge of the window provides axial limit of the hook ends.

The fixing element with the reworking function comprises: the outer diameter of the combining area is smaller than that of the rest parts of the sleeve, the lowest side of the combining area is provided with a step part, and the step part can provide axial limiting of the snap spring ring to prevent the snap spring ring from being excessively separated from the combining area downwards.

The fixing element with the reworking function comprises: the annular body of the clamping spring coil is combined with the combining area of the sleeve in a loose fit or tight fit mode.

The fixing element with the reworking function comprises: the clamping spring ring is provided with an abutting part which is positioned on the upper side surface of the clamping spring ring and is close to the outer edge of the upper side surface of the clamping spring ring.

The utility model also provides a reworking fixture for reworking and resetting the fixing element with the reworking function, which is characterized by comprising a head, wherein at least two independently arranged pressing columns are protruded at one end of the head, and the at least two independently arranged pressing columns respectively and correspondingly penetrate through two notches of the screw head.

The fixing element with the reworking function comprises: when the jig is subjected to downward pressure, the at least two independently arranged pressing columns synchronously compress and press the top end of the spring downwards, so that the spring is pressed downwards from the position originally propped against the lower end face of the screw head, and the top end of the spring is pressed into the accommodating space of the sleeve.

The fixing element of the utility model can be used for a heat dissipating device assembled with a heat generating source in a bare crystal form, and can also provide a reassembly opportunity when the heat dissipating device needs to be reassembled or replaced.

Drawings

Fig. 1 is a schematic diagram of a conventional heat dissipating device and a die assembly.

Fig. 2 is a schematic diagram of a conventional heat spreader and die combination.

Fig. 3 is a perspective combined view of the fixing element with the reworking function.

Fig. 4 is an exploded perspective view of the fastening element with rework function of the present utility model.

FIG. 5 is a schematic diagram illustrating the operation of the fastening device with rework function according to the present utility model.

FIG. 6 is a schematic diagram illustrating the operation of the fastening device with rework function according to the present utility model.

FIG. 7 is a schematic diagram illustrating the operation of the fastening device with rework function according to the present utility model.

Reference numerals illustrate: a fixing unit 1; a screw 11; a screw head 112; an upper end face 1121; a lower end surface 1122; an outer screw 113; a cutout 114; the clasp-accommodating groove 115; a clasp 116; a spring 117; a tip 1171; a bottom end 1172; a sleeve 12; an upper end 121; a lower end 122; the accommodating space 123; a bonding region 124; a window 125; an upper edge 1251; a stepped portion 1252; a click spring coil 13; an abutting portion 131; hook arm group 132; hook arm 132A; hook end 1321; a reworking tool P; a head portion P1; a pressing column P2; a heat sink 2; a first side 21; a second side 22; a heated region 23; a perforation 24; a heat source 3; a fixed structure 4; pressing down the jig 5; against the rolled extension 51.

Detailed Description

The above objects of the present utility model, as well as the structural and functional characteristics thereof, will be described in terms of the preferred embodiments of the present utility model as illustrated in the accompanying drawings.

Referring to fig. 3 and 4, which are respectively an assembly and an exploded view of a fixing element with rework function according to the present utility model, as shown in the drawings, the fixing element with rework function can be reworked and reset by matching with a rework tool P, and assembled again, the fixing unit 1 comprises: a screw 11, a sleeve 12, a clamping spring coil 13;

the screw 11 has a screw head 112 and a plurality of outer threads 113 at the upper and lower ends, the screw head 112 has two cutouts 114, the two cutouts 114 penetrate the screw head 112 along the axial direction of the screw 111 and are disposed in parallel opposite to each other, the screw head 112 has an upper end face 1121 and a lower end face 1122, and the two cutouts 114 penetrate the upper end face 1121 and the lower end face 1122 of the screw head 112 at the same time. A retaining ring accommodating groove 115 is arranged above the screw 111 adjacent to the outer screw thread 113, and a retaining ring 116 is clamped in the retaining ring accommodating groove 115; a spring 117 is sleeved outside the screw 111, the spring 117 is disposed between the screw head 112 and the retaining ring 116, the spring 117 has a top end 1171 and a bottom end 1172, the bottom end 1172 of the spring 117 abuts against the retaining ring 116, and the retaining ring 116 provides axial limitation of the bottom end 1172 of the spring 117 to prevent the spring 117 from being separated from the screw 11.

The sleeve 12 has an upper end 121 and a lower end 122 which are open, and a receiving space 123, the receiving space 123 is formed in the sleeve 12 between the upper end 121 and the lower end 122, a pair of windows 125 are concavely disposed near the upper end 121 of the sleeve 12, the pair of windows 125 are disposed at 180 degrees or equal angles, and the pair of windows 125 are radially communicated with the receiving space 123. The sleeve 12 is sleeved on the screw 111 at the outer part where the spring 117 passes through.

The window 125 has an upper edge 1251, a combining area 124 is formed between the lower edge of the window 125 and the lower end 122 of the sleeve 12, the combining area 124 can be selected to be the same diameter as the sleeve or be formed by the sleeve 12 being narrowed inwards, so that the outer diameter of the combining area 124 is smaller than the outer diameter of the rest of the sleeve 12, and a different step outer diameter is formed outside the sleeve 12, i.e. the connection between the lowest side of the combining area 124 and the sleeve 12 has a step 1252, the step 1252 can provide axial limit for the snap ring 13, preventing the snap ring 13 from moving downwards excessively and separating from the combining area 124.

The snap ring 13 is sleeved on the combining area 124 of the sleeve 12, the upper side of the snap ring 13 extends upwards to form a hook arm set 132, the hook arm set 132 has a pair of hook arms 132A, the free ends of the pair of hook arms 132A are bent inwards to form a hook end 1321, the hook ends 1321 extend into the accommodating space 123 of the sleeve 12 from the window 125, the top end 1171 of the spring 117 supports the hook ends 1321 upwards to displace upwards, and the upper side surface of the horizontally extending hook ends 1321 supports the upper edge 1251 of the window 125 upwards to stop the upward displacement and limit, and simultaneously the top end 1171 of the spring 117 is also buckled, so that the spring is prevented from continuing to support upwards, the spring 117 is further compressed in the sleeve, and the combining area 124 of the snap ring 13 and the sleeve 12 can be combined in a loose fit or tight fit manner.

When the assembly of the present embodiment is performed, after the screw 11 with the spring 117 is placed in the accommodating space 123 of the sleeve 12, the spring 117 is limited by the pressing of the hook ends 1321 of the pair of hook arms 132A of the snap ring 13 in the axial direction, so that the spring 117 cannot be supported or stretched upwards, and is in a compressed state.

Referring to fig. 5, 6 and 7, which are schematic diagrams illustrating the operation of the fixing element with rework function according to the present utility model, the present utility model provides a fixing element with rework function, in which the fixing element 1 is applied to a heat dissipating device 2 and a heat generating source 3 in a bare die state for illustration, the heat dissipating device 2 has a first side 21, a second side 22 and a heat receiving region 23, and the heat receiving region 23 is disposed near the center of the second side 22 of the heat dissipating device 2.

When the heat dissipating device 2 is to provide heat exchange or heat conduction to the heat source 3, the fixing elements 1 are disposed at four corners of the heat dissipating device 2 outside the heat receiving area 23, the screws 11 of the fixing elements are first fastened and fixed with a fixing structure 4 (a stud with an internal thread) disposed adjacent to the four corners of the heat source 3 by the plurality of external threads 113, and at this time, the spring 117 sleeved outside the screws 11 still does not release its elastic force, so that the heat dissipating device body 2 is only disposed above the heat source 3 and does not press the heat source 3 any pressure, i.e. the surface (the second side 22) of the heat receiving area 23 of the heat dissipating device 2 only lightly touches the surface of the heat source 3. In order to provide uniform downward pressure, the fixing elements 1 disposed at the outer corners of the heated region 23 of the heat sink 2 must simultaneously and synchronously release the elastic force of the springs 117, so as to provide uniform downward pressing force of the heat sink 2 and the heat source 3.

In order to simultaneously and synchronously trigger the springs 117 of the fixing elements 1 to release the elastic force, a device (not shown) is used in combination with a pressing tool 5 to make the fixing elements 1 synchronously move downwards to provide a pressing force. The device (not shown) may be a punch press or other mechanical device or machine capable of providing a pressing force, the device (not shown) is connected to the pressing tool 5, the pressing tool 5 has at least one pressing extension portion 51, the pressing extension portions 51 are disposed corresponding to the fixing elements 1 disposed at four corners of the heated region 23 of the heat dissipating device body 2, and abut against an abutting portion 131 on the upper side of the clamping ring 13 and are close to the outer edge of the upper surface of the clamping ring 13, when the device (not shown) drives the pressing tool 5 to move downward, the pressing extension portion 51 simultaneously presses the abutting portions 131 of the clamping ring 13 downward, the contact portion between the clamping ring 13 and the sleeve 12 forms a rotating fulcrum a, when the pressing jig 5 applies a downward pressure to the abutting portion 131 of the snap ring 13, the snap ring 13 is supported by the supporting point a, and the abutting portion 131 turns outwards and downwards, and drives the pair of hook arms 132A to withdraw from the window 125 towards the radial outer direction of the sleeve 12, and to expand and stretch outwards, the hook ends 1321 of the pair of hook arms 132A remove the press buckle on the top end 1171 of the spring 117, so that the spring 117 completely releases the limited spring tension, and the top end 1171 of the spring 117 abuts against the lower end face 1221 of the screw head 112, so that the bottom end 1172 of the spring 117 arranged on the fixing element 1 at the four corners provides a uniform downward pressure to the four corners of the heat dissipating device 2 synchronously, thereby enabling the heat dissipating device 2 to uniformly attach to the heat generating source 3 downwards.

The screw 11 of the utility model only installs and positions the heat dissipating device body 2 above the heat generating source 3, and actually provides the downward pressing force of the heat dissipating device 2 to the heat generating source 3 as the spring 117 arranged outside the screw 11 at the four corners, so that a synchronous and uniform pressing force can be provided after the spring is released, and the defects of uneven stress caused by the one-by-one locking of the existing single locking points or the warp or direct collapse damage caused by uneven stress of a wafer due to overlarge pressing force of the spring or the like are overcome.

In addition to providing uniform downward pressure between the heat dissipating device 2 and the heat generating source 3, the fixing element 1 of the present utility model can provide a reworkable (reinstallable) function when the heat dissipating device 2 needs to be reinstalled, replaced or adjusted after installation, so that when the reworking (reinstallation) is needed, the fixing element 1 is matched with a preset reworking tool P to reinstall the spring 117 in the sleeve.

The rework tool P has a head portion P1, and at least two independently disposed pressing columns P2 protrude from one end of the head portion P1, the pressing columns P2 can respectively pass through the two cutouts 114 of the screw head 112, when downward pressure is applied to the rework tool P, the pressing columns P2 are simultaneously driven to compress and press the top end 1171 of the spring 117 downward, the spring 117 is compressed downward from the position originally propped against the lower end face 1122 of the screw head 112, the top end 1171 of the spring 117 is pressed into the accommodating space 123 of the sleeve 12, the other side (lower side) of the abutting portion 131A of the clamp ring 13 is then shifted upward (manually or assisted by a tool matching device), the pivot point a of the clamp ring 13 is again supported, the hook ends 1321 of the two hook arms 132A of the clamp ring 13 extend into the accommodating space 123 toward the window 125, are buckled and clamped in the top end 1171 of the spring 117 again, and the hook ends 132A of the hook arms 132A are also axially arranged on the window 125 again, and the hook ends 132A are axially arranged on the window 125 again, so that the hook ends 132A are axially arranged on the sleeve 125 again, and the sleeve is mounted on the surface 125 again.

The fixing element of the present utility model can provide the heat sink 2 assembled with the heat source 3 in bare die form, and can also provide the opportunity for reassembly when the heat sink 2 needs to be reassembled or replaced.

Claims

1. A fixing element with reworking function for fixing a heat sink to a bare die heat source in a repeatable installation and use manner, characterized in that: comprising the following steps:

the clamping spring coil is sleeved on the combining area of the sleeve, and extends upwards to form a hook arm group, the hook arm group is provided with a pair of hook arms, and the pair of hook arms extend into the top end of the spring for pressing and buckling respectively from the window to enable the spring to be in a compressed state; when the heat sink and the heat generating element are installed, the hook arm is operated to withdraw from the window to release the spring, so as to provide a synchronous and uniform downward pressure.

2. The reworking enabled fastening element of claim 1 wherein: the screw head has an upper end face and a lower end face, and the two notches penetrate through the upper end face and the lower end face of the screw head at the same time.

3. The reworking enabled fastening element of claim 1 wherein: the tail ends of the free ends of the hook arms are inwards bent to form a hook end, the hook end stretches into the accommodating space of the sleeve from the window, the pair of windows are provided with an upper edge, the upper side surfaces of the hook ends are propped against the upper edge, and the upper edge of the window provides axial limit of the hook ends.

4. The reworking enabled fastening element of claim 1 wherein: the outer diameter of the combining area is smaller than that of the rest parts of the sleeve, the lowest side of the combining area is provided with a step part, and the step part can provide axial limiting of the snap spring ring to prevent the snap spring ring from being excessively separated from the combining area downwards.

5. The reworking enabled fastening element of claim 1 wherein: the annular body of the clamping spring coil is combined with the combining area of the sleeve in a loose fit or tight fit mode.

6. The reworking enabled fastening element of claim 1 wherein: the clamping spring ring is provided with an abutting part which is positioned on the upper side surface of the clamping spring ring and is close to the outer edge of the upper side surface of the clamping spring ring.

7. A reworking fixture for reworking and resetting the fixing element with reworking function according to any one of claims 1-6, wherein the reworking fixture is provided with a head, at least two independently arranged pressing columns are protruded at one end of the head, and the at least two independently arranged pressing columns respectively correspond to two cuts penetrating through the screw head.