CN206104638U - Reinforce shape fibrofelt punching device that flows back back in flat plate heat pipe - Google Patents
Reinforce shape fibrofelt punching device that flows back back in flat plate heat pipe Download PDFInfo
- Publication number
- CN206104638U CN206104638U CN201620908579.6U CN201620908579U CN206104638U CN 206104638 U CN206104638 U CN 206104638U CN 201620908579 U CN201620908579 U CN 201620908579U CN 206104638 U CN206104638 U CN 206104638U
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- Prior art keywords
- mould
- top board
- fiber felt
- punch
- heat pipe
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Abstract
The utility model relates to a reinforce shape fibrofelt punching device that flows back back in flat plate heat pipe, including last mould, lower mould and base, the lower mould is installed on the base, goes up the mould and leaves or be close to the lower mould along upper and lower direction, the lower mould includes lower punch, holding down plate and lower half compression resilience subassembly, it includes the terrace die, goes up kicking block, roof, top board and first compression resilience subassembly to go up the mould, the upper end the through -hole peripheral and top board of lower punch returns the terrace die and the die of the peripheral shape of shape fibrofelt respectively as the blanking, the lower extreme the hole peripheral and lower punch of going up the terrace die returns the terrace die and the die of shape fibrofelt inner circle shape respectively as the blanking. The utility model discloses be particularly useful for processing small -size, that be difficult for that it flow back back to reinforce in the fashioned flat plate heat pipe of direct sintering and appear the fibrofelt, easy operation can practice thrift the human cost in a large number, belongs to the shaping preparation field of fibrofelt material aftertreatment.
Description
Technical field
This utility model is related to fibrous felt materials post processing shaping preparation field, specifically, is related to a kind of flat-plate heat pipe
It is interior to strengthen the back-shaped fiber felt blanking apparatus of backflow.
Background technology
As annealer caloric value is improved constantly, the new technique for much contributing to radiator is also evolving, it is desirable to
Selected material has high specific heat and high heat-conduction coefficient simultaneously, and the two parameters of metal fiber felt become all in prostatitis
The popular research direction of current radiating development.
Metal fiber felt is a kind of new porous material, and its specific surface area is big, and relative density is less, and cost performance is high,
With good heat transfer property, and capillary performance, it is widely used in radiating flat-plate heat pipe reinforcing backflow and supports in column production.
At present institute is larger using the metal fiber felt geomery that sintering processing is obtained, post processing mode deficiency, is unfavorable for
The processing of small heat pipe and flat-plate heat pipe reinforcing backflow support column fibrous felt materials, becomes current small heat pipe and flat-plate heat pipe is sent out
One big obstacle of exhibition.
Accordingly, it would be desirable to a kind of special blanking apparatus for undersized fiber felt.
Utility model content
For the making difficult problem of prior art small-medium size fiber felt sample, the purpose of this utility model is：There is provided
One kind can effectively improve making precision and make efficiency, while reducing the back-shaped fibre of reinforcing backflow in the flat-plate heat pipe of cost of manufacture
Dimension felt blanking apparatus.
In order to achieve the above object, this utility model is adopted the following technical scheme that：
The back-shaped fiber felt blanking apparatus of reinforcing backflow in a kind of flat-plate heat pipe, including upper die and lower die and base, lower mould is installed
On base, upper mould leaves or near lower mould along above-below direction；Lower mould includes lower punch, lower platen and lower half compression rebound
Component；Lower platen is equipped with the lower half compression and back for above pushing away lower platen relative to base upper and lower translation between lower platen and base
Play component；Lower platen is passed through with the upper end of the relatively-stationary lower punch of base；The upper end of lower punch is provided with endoporus；Upper mould includes upper
Punch, upper jacking block, top board, top board and first half compression rebound component；Upper male mould, top board, top board are relatively fixed, upper male mould
Upper end fix with top board, lower platen is provided with the through hole penetrated for the upper end of lower punch, and the lower end of upper male mould is located at lower platen
Through hole in；Upper jacking block is enclosed within outside upper male mould and withstands on the upper surface of top board by first half compression rebound component；Lower punch
Upper end periphery and top board through hole respectively as the punch and die for being punched back-shaped fiber felt peripheral shape, under upper male mould
The endoporus of end periphery and lower punch is respectively as the punch and die for being punched loop-shaped in back-shaped fiber felt.
Upper mould includes train wheel bridge, middle clamp plate, block；Top board, train wheel bridge, middle clamp plate, top board are from top to bottom successively
Arrange；The upper end of upper male mould is fixed between train wheel bridge and top board；Be provided with middle clamp plate receiving first half compression rebound component,
The cavity volume for running through of block and upper jacking block, the lower end of the embedded block of upper jacking block, under the guide effect of block in cavity volume up and down
Translation；First half compression rebound component withstands the upper end of block.
First half compression rebound component is the spring of compression, and the spring is located between block and train wheel bridge.Upper jacking block includes
Jacking block is circumferentially rotated in restriction head and the guide part of the tubular positioned at lower head；Under the embedded block of the head of upper jacking block
End, the guide part of upper jacking block stretches into the through hole of top board, guide part of the upper male mould through upper jacking block.
Upper male mould includes limiting the head that upper male mould is circumferentially rotated, in the embedded train wheel bridge of head of upper male mould, upper male mould
Withstood by top board the upper end of head.
Lower mould includes lower plate, and lower plate is fixed on base；Lower half compression rebound component includes spring and spring
Support seat, the upper end of spring support seat is connected with lower platen, and spring support seat passes through lower plate and upper and lower sliding, bullet in lower plate
The lower end of spring support base is connected with the upper end of spring, and the lower end of spring is withstood on base.
Lower punch includes limiting the head that lower punch is circumferentially rotated, in the embedded lower plate of head of lower punch, lower punch
Withstood by base the lower end of head.
The endoporus of lower punch is through to lower end from upper end；Base is provided with dumping pit, and dumping pit is located at the endoporus of upper male mould
Underface, and dumping pit connects with the endoporus of upper male mould.
The back-shaped fiber felt blanking apparatus of reinforcing backflow in a kind of flat-plate heat pipe, also including the supporting cell guide for erecting, support is led
The lower end of post is fixed on base；Upper die and lower die are respectively provided with the pilot hole for running through, and supporting cell guide is located in pilot hole, upper mould and
Lower mould is each along supporting cell guide upper and lower translation.
Upper end periphery and top board respectively as the lower punch of the punch and die for being punched back-shaped fiber felt peripheral shape
Through hole between gap length be c, the thickness of back-shaped fiber felt is h, is met：For copper fiber felt or aluminum fiber mat, h ＜
1mm, c=(3%～4%) h, 1mm≤h ＜ 3mm, c=(5%～8%) h, 3mm≤h≤5mm, c=(8%～10%) h；It is right
In stainless steel fibre felt, h ＜ 1mm, c=(4%～5%) h, 1mm≤h ＜ 3mm, c=(6%～8%) h, 3mm≤h≤5mm, c
=(8%～13%) h.
Generally speaking, this utility model has the advantage that：
The energy realization small size of major part metal fiber felt, high-volume making at present, and making precision and efficiency are higher, dress
It is set to relatively low, automaticity is higher, can Reusability.Be particularly suited for it is undersized, be difficult the flat of direct sintering molding
The back-shaped fiber felt of reinforcing backflow in plate heat pipe, and fiber felt sample can be prepared to change by concave-convex mold shape in change device
Shape.Operation very simple, can in a large number save human cost.
Description of the drawings
Fig. 1 is the half-sectional axonometric chart in concave-convex mold part of the present utility model, and cutting plane is centered position in front and back.
Fig. 2 is the half-sectional axonometric chart of spring supporting seating portion of the present utility model, and cutting plane is before the cutting plane of Fig. 1
Side.
Fig. 3 a are the axonometric charts of lower punch.
Fig. 3 b are the axonometric charts of upper male mould.
Fig. 4 a are the axonometric charts of upper jacking block.
Fig. 4 b are the axonometric charts of block.
Fig. 5 is the 4mm obtained using this utility model, the aluminum fiber mat sample drawing of endoporus 2mm*2mm.
Wherein, 1 is top board, and 2 is train wheel bridge, and 3 is middle clamp plate, and 4 is top board, and 5 is lower platen, and 6 is lower plate, and 7 are
Base, 8 is supporting cell guide, and 9 is lower punch, and 10 is upper jacking block, and 11 is block, and 12 is the spring of first half compression rebound component,
13 is upper male mould, the spring of 14 lower half compression rebound components, and 15 is spring support seat.
Specific embodiment
Come that the utility model is described in more detail below.
The back-shaped fiber felt blanking apparatus of reinforcing backflow in a kind of flat-plate heat pipe, including upper die and lower die, base, supporting cell guide,
Lock-screw, pin etc..
1. mould is gone up：
Upper mould include upper male mould, upper jacking block, top board, top board, first half compression rebound component, train wheel bridge, middle clamp plate,
Block.
Top board is platy structure.Train wheel bridge is platy structure, and upper surface is provided with the mounting groove of the head of embedded upper male mould.In
The center of portion's clamping plate is provided with the cavity volume for running through, and the cavity volume is used to accommodate first half compression rebound component, block, upper jacking block, transversal
Face shape is corresponding to block shape, is oriented to so as to cavity volume and block combine to move up and down block.Top board is tabular
Structure, which is provided with the through hole for running through, the lower end of jacking block and upper male mould in receiving, and penetrate for the upper end of lower punch.Block
For tabular, cross-sectional sizes are corresponding to the cross-sectional sizes of cavity volume, and the lower end of block is provided with pacify corresponding with the nose shape of upper jacking block
Tankage, it is embedded for upper jacking block.Upper jacking block includes limiting head that upper jacking block circumferentially rotates and the tubular positioned at lower head is led
To portion, the head of upper jacking block is the rectangle structure with two semicircular in the present embodiment, and it act as preventing plus man-hour upper jacking block
Relatively rotate with block.The head of upper male mould is the rectangle structure with two semicircular, prevent punching when rotate or
It is axial movement, the stage casing of upper male mould is cylinder, and hypomere is squared design, as being punched the convex of loop-shaped in back-shaped fiber felt
Mould, while also sample is peeled off into original tape material.First half compression rebound component is the spring of compression；The selection gist of spring is middle part
The thickness of clamping plate and thrust needed for punching；Types of springs selects compression spring；When first half compression rebound component is used to be punched,
Fiber felt sample is compressed, fiber felt skew when preventing from being punched sample endoporus, while can be under the action of the spring after punching terminates
Baffle plate and the timely resilience of upper jacking block, release is set to be punched out fiber felt sample.
The work surface of upper male mould is flushed with the work surface of top board, while the axis of operation of upper male mould and top board are into vertical
Relation.
Upper jacking block is gap cooperation with top board, and fit clearance is preferably sized to 0.3mm≤t2≤ 0.6mm, the present embodiment
For t2=0.5mm.Upper jacking block is gap cooperation with block, and fit clearance is preferably sized to 0.3mm≤t3≤ 0.6mm, the present embodiment
For t3=0.5mm.There is interstitial hole and pass through for upper male mould in upper jacking block, the interstitial hole is big with the fit clearance of upper male mould with block
It is little to be preferably 0.4mm≤t4≤ 0.8mm, the present embodiment is t4=0.6mm.
Top board is the die of pretightning force pressing plate and punching fiber felt sample topography, and it is flat with fiber felt contact surface
Face, is punched fiber felt sample topography die inwall for smooth inner wall, and roughness is preferably between 0.8～Ra of Ra 1.6, this reality
It is Ra 0.8 to apply example, and the size of profile die is related to lower punch size and punching material, wherein punching material is aluminum fiber mat,
Punching Thickness ness h=2.5mm, gap length selects c=0.2mm.
Top board is used to clamp upper male mould with train wheel bridge.
The annexation of upper mould is as follows：It is whole that top board, train wheel bridge, middle clamp plate, top board are in turn connected into from top to bottom one
Body, this is integrally provided with two pilot holes, coordinates with two supporting cell guides.In the mounting groove of the embedded train wheel bridge of the head of upper male mould,
The top of the head is spacing by top board.Upper male mould passes through the lower end of train wheel bridge, cavity volume, block, upper jacking block, upper male mould to be located at upper pressure
In the through hole of plate.Spring is located between train wheel bridge and block, so that upper jacking block has the trend for pushing.The head of upper jacking block is embedding
Enter block, block is located in cavity volume, the guide part of upper jacking block inserts the through hole of top board.
2. mould is descended：
Lower mould includes lower punch, lower platen, lower half compression rebound component, lower plate.
Lower platen is platy structure, and centre is provided with through hole and passes through for lower punch.Lower plate is platy structure, lower end be provided with
The corresponding mounting groove of shape of the head of lower punch, installs for lower punch is embedded；Lower plate is additionally provided with two and supplies spring support seat
The through hole for passing through；Lower plate is fixed on base.The head of lower punch is the rectangle structure with two semicircular, when preventing punching
Rotate or move axially；The blanking portion of lower punch is using ladder circle column structure and inside is provided with square endoporus
Used as the die of fiber felt endoporus punching, the endoporus runs through up and down, can be used for discharging.The quantity of lower half compression rebound component is
Two groups, per group of spring support seat and a spring for including a cylinder；The selection gist of spring for lower plate thickness with
Thrust needed for punching；Types of springs selects compression spring；Lower half compression rebound device (5,14,15), when it is used to be punched,
First give fiber felt strip certain pretightning force, fiber felt skew when preventing from being punched sample topography profile, while after punching terminates
The lower punch 9 and pressing plate 5 can be under the action of the spring helped to return to initial position, so as to next round punching.
There is certain interval between lower punch and lower platen, gap length is relevant with minimum pretightning force needed for be punched sample,
Its gap is preferably sized to 0.4mm≤t1≤ 0.6mm, the present embodiment is t1=0.5mm.Spring support seat is gap with lower plate
Coordinate, and fit clearance is preferably 0.5mm≤t5≤ 0.8mm, the present embodiment is t5=0.6mm.Lower platen middle part exist through hole with
It is gap cooperation between lower punch, fit clearance is preferably sized to 0.4mm≤t6≤ 0.6mm, the present embodiment is t6=0.5mm.
The annexation of lower mould is as follows：Lower plate is fixed on base.The upper end of spring support seat connects with lower platen screw thread
Connect, the upper end of the lower termination spring of spring support seat, the upper end of spring is withstood on base, spring support seat is located at the logical of lower plate
Coordinate with through hole in hole.In the mounting groove of the embedded lower plate of the head of lower punch, the lower end of the head of lower punch is spacing by base.
3. base：
Base for supporting whole device is provided with dumping pit, connects for discharging with the endoporus of lower punch.On base
Two supporting cell guides for erecting are fixed with, supporting cell guide can sequentially pass through lower plate, lower platen, top board, middle clamp plate, upper folder
Plate, top board.
The guide rail of up-down blanking is supporting cell guide, and itself and base are interference fits, with lower plate, middle clamp plate, upper folder
Plate, top board are gap cooperation, and fit clearance is preferably 0.5mm≤t7≤ 0.8mm, the present embodiment is preferably t7=0.6mm, its with
Upper and lower clamping plate is gap cooperation, and fit clearance is preferably 0.4m≤t8≤ 0.6mm, the present embodiment is preferably t8=0.5mm.
Fixation in device is all the clamping plate in the way of lock-screw connection, and the positioning of top board etc. is entered by pin
Row positioning.
4. the course of processing of the present utility model is as follows：
(1) strip of 2mm is placed on lower platen, and just to upper male mould and lower punch.
(2) downward pressure is applied to top board, upper mould is integrally moved down along supporting cell guide, and top board and lower platen are contacted,
Strip is compressed into the pretightning force certain so as to give fiber felt strip, lower platen is moved down with upper mould.
(3) after lower platen is moved down, lower punch exposes lower platen, and the upper end periphery of lower punch and the through hole of top board are made respectively
To be punched the punch and die of back-shaped fiber felt peripheral shape, peripheral shape is punched out.
(4) while along with step (3), the lower end of the upper male mould in top board reaches lower punch, upper male mould
The endoporus of lower end periphery and lower punch is punched out interior cast respectively as the punch and die that are punched loop-shaped in back-shaped fiber felt
Shape.
(5) mould is further moved down on, and upper male mould ejects in the inner ring waste material being punched out, and the endoporus of waste material Jing lower punches and unloads
Discharge in material hole.
(6) top board rises and resets, and lower platen resets under the action of the spring, and upper jacking block resets under the action of the spring.
Thus the processing of the back-shaped fiber felt of reinforcing backflow in a flat-plate heat pipe is completed, punching sample is 4mm external diameters, 2mm*
2mm inside square hole, form accuracy is good, is capable of achieving continuous stamping shaping, and efficiency high can Reusability.
In addition to the mode that the present embodiment is referred to, the upper end periphery of lower punch, the through hole of top board, outside the lower end of upper male mould
Enclose, the endoporus of lower punch can be selected according to the shape of fiber felt sample.Upper male mould, lower punch, the head of upper jacking block may be used also
Select ellipsoidal structure, with the square of half nose circle or other prevent the structure that circumferentially rotates.Types of springs can be compression spring
Or die springs or wavy spring or other types.These mapping modes are in protection domain of the present utility model.
Above-described embodiment is this utility model preferably embodiment, but embodiment of the present utility model is not by above-mentioned
The restriction of embodiment, it is other it is any without departing from the change made under spirit of the present utility model and principle, modify, replace
Generation, combination, simplification, should be equivalent substitute mode, be included within protection domain of the present utility model.
Claims (10)
1. the back-shaped fiber felt blanking apparatus of backflow, including upper die and lower die and base are strengthened in a kind of flat-plate heat pipe, and lower mould is arranged on
On base, upper mould leaves or near lower mould along above-below direction, it is characterised in that：
Lower mould includes lower punch, lower platen and lower half compression rebound component；Lower platen is relative to base upper and lower translation, lower platen
Equipped with the lower half compression rebound component for above pushing away lower platen and base between；Wear with the upper end of the relatively-stationary lower punch of base
Cross lower platen；The upper end of lower punch is provided with endoporus；
Upper mould includes upper male mould, upper jacking block, top board, top board and first half compression rebound component；Upper male mould, top board, top board
It is relatively fixed, upper end and the top board of upper male mould are fixed, and lower platen is provided with the through hole penetrated for the upper end of lower punch, upper male mould
Lower end is located in the through hole of lower platen；Upper jacking block is enclosed within outside upper male mould and withstands on top board by first half compression rebound component
Upper surface；
The upper end periphery of lower punch and the through hole of top board respectively as the punch and die for being punched back-shaped fiber felt peripheral shape,
The lower end periphery of upper male mould and the endoporus of lower punch are respectively as the punch and die for being punched loop-shaped in back-shaped fiber felt.
2. according to the back-shaped fiber felt blanking apparatus of reinforcing backflow in a kind of flat-plate heat pipe described in claim 1, it is characterised in that：
The upper mould includes train wheel bridge, middle clamp plate, block；Top board, train wheel bridge, middle clamp plate, top board set gradually from top to bottom；
The upper end of upper male mould is fixed between train wheel bridge and top board；Receiving first half compression rebound component, block are provided with middle clamp plate
With the cavity volume for running through of upper jacking block, the lower end of the embedded block of upper jacking block, under the guide effect of block in cavity volume upper and lower translation；
First half compression rebound component withstands the upper end of block.
3. according to the back-shaped fiber felt blanking apparatus of reinforcing backflow in a kind of flat-plate heat pipe described in claim 2, it is characterised in that：
The first half compression rebound component is the spring of compression, and the spring is located between block and train wheel bridge.
4. according to the back-shaped fiber felt blanking apparatus of reinforcing backflow in a kind of flat-plate heat pipe described in claim 2, it is characterised in that：
The upper jacking block includes the guide part of the restriction head that above jacking block is circumferentially rotated and the tubular positioned at lower head；The head of upper jacking block
The lower end of the embedded block in portion, the guide part of upper jacking block stretches into the through hole of top board, guide part of the upper male mould through upper jacking block.
5. according to the back-shaped fiber felt blanking apparatus of reinforcing backflow in a kind of flat-plate heat pipe described in claim 2, it is characterised in that：
The upper male mould includes limiting the head that upper male mould is circumferentially rotated, in the embedded train wheel bridge of head of upper male mould, the head of upper male mould
Upper end withstood by top board.
6. according to the back-shaped fiber felt blanking apparatus of reinforcing backflow in a kind of flat-plate heat pipe described in claim 1, it is characterised in that：
The lower mould includes lower plate, and lower plate is fixed on base；Lower half compression rebound component includes spring and spring support seat,
The upper end of spring support seat is connected with lower platen, and spring support seat passes through lower plate and the upper and lower sliding in lower plate, spring
The lower end of support seat is connected with the upper end of spring, and the lower end of spring is withstood on base.
7. according to the back-shaped fiber felt blanking apparatus of reinforcing backflow in a kind of flat-plate heat pipe described in claim 6, it is characterised in that：
The lower punch includes limiting the head that lower punch is circumferentially rotated, in the embedded lower plate of head of lower punch, the head of lower punch
Lower end withstood by base.
8. according to the back-shaped fiber felt blanking apparatus of reinforcing backflow in a kind of flat-plate heat pipe described in claim 1, it is characterised in that：
The endoporus of the lower punch is through to lower end from upper end；Base is provided with dumping pit, and dumping pit is being located at the endoporus of upper male mould just
Lower section, and dumping pit connects with the endoporus of upper male mould.
9. according to the back-shaped fiber felt blanking apparatus of reinforcing backflow in a kind of flat-plate heat pipe described in claim 1, it is characterised in that：
Also include the supporting cell guide for erecting, the lower end of supporting cell guide is fixed on base；Upper die and lower die are respectively provided with the pilot hole for running through,
Supporting cell guide is located in pilot hole, and upper die and lower die are each along supporting cell guide upper and lower translation.
10., according to the back-shaped fiber felt blanking apparatus of reinforcing backflow in a kind of flat-plate heat pipe described in claim 1, its feature exists
In：Upper end periphery and the through hole of top board respectively as the lower punch of the punch and die for being punched back-shaped fiber felt peripheral shape
Between gap length be c, the thickness of back-shaped fiber felt is h, is met：
For copper fiber felt or aluminum fiber mat,
H ＜ 1mm, c=(3%～4%) h,
1mm≤h ＜ 3mm, c=(5%～8%) h,
3mm≤h≤5mm, c=(8%～10%) h；
For stainless steel fibre felt,
H ＜ 1mm, c=(4%～5%) h,
1mm≤h ＜ 3mm, c=(6%～8%) h,
3mm≤h≤5mm, c=(8%～13%) h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620908579.6U CN206104638U (en) | 2016-08-19 | 2016-08-19 | Reinforce shape fibrofelt punching device that flows back back in flat plate heat pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620908579.6U CN206104638U (en) | 2016-08-19 | 2016-08-19 | Reinforce shape fibrofelt punching device that flows back back in flat plate heat pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206104638U true CN206104638U (en) | 2017-04-19 |
Family
ID=58512839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620908579.6U Expired - Fee Related CN206104638U (en) | 2016-08-19 | 2016-08-19 | Reinforce shape fibrofelt punching device that flows back back in flat plate heat pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206104638U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106140936A (en) * | 2016-08-19 | 2016-11-23 | 华南理工大学 | The back-shaped fiber felt blanking apparatus of strengthening backflow in a kind of flat-plate heat pipe |
-
2016
- 2016-08-19 CN CN201620908579.6U patent/CN206104638U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106140936A (en) * | 2016-08-19 | 2016-11-23 | 华南理工大学 | The back-shaped fiber felt blanking apparatus of strengthening backflow in a kind of flat-plate heat pipe |
| CN106140936B (en) * | 2016-08-19 | 2018-10-30 | 华南理工大学 | A kind of flat-plate heat pipe is interior to strengthen the back-shaped fibrofelt blanking apparatus that flows back |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170419 Termination date: 20190819 |
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| CF01 | Termination of patent right due to non-payment of annual fee |