CN214079463U - Milling cutter for processing grid texture structure - Google Patents
Milling cutter for processing grid texture structure Download PDFInfo
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- CN214079463U CN214079463U CN202022148743.7U CN202022148743U CN214079463U CN 214079463 U CN214079463 U CN 214079463U CN 202022148743 U CN202022148743 U CN 202022148743U CN 214079463 U CN214079463 U CN 214079463U
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Abstract
The utility model discloses a milling cutter for processing net line structure, wherein, net line structure includes recess and plane, including the blade disc, install in first blade and second blade on the blade disc, first blade and second blade encircle the central axis setting of blade disc, first blade is used for the machined surface, the second blade is used for processing the recess, the cutting end of first blade with the cutting end of second blade all protrusion in the terminal surface of blade disc, just the cutting end of second blade compares the cutting end distance of first blade the terminal surface of blade disc is farther. It can realize processing recess and plane in the latticed structure simultaneously, possesses the machining efficiency height, can effectively reduce cost's advantage.
Description
Technical Field
The utility model relates to a milling cutter technical field especially relates to a milling cutter for processing net line structure.
Background
With the deep understanding of the automobile knowledge by consumers, the problem of engine leakage (oil leakage, water leakage and air leakage) becomes a focus of the media and the close attention of consumers. For example, the oil leakage phenomenon of the oil pan sealing surface is particularly common, and the reasons are as follows: the oil pan top surface all has certain shape error (plane degree) with the cylinder body bottom surface, for guaranteeing engine leakproofness, must use sealed glue to fill in the junction. Because the oil pan receives the effect of bolt moment in the installation, elastic deformation can take place for the work piece, and the work piece faying face is planar structure, and its glue storage capacity is limited, and most sealed glue will be forced out. When the extrusion amount is large, the bonding surface is free of glue, and oil leakage of an oil pan of the engine is caused. How to improve the glue storage amount of the joint surface is a problem which is urgently solved by various manufacturers.
At present, it is generally accepted that the method of processing the surface of the workpiece into the grid texture is the most practical and effective method. The main purpose of processing the plane grid lines on the surface of the workpiece is to increase the surface roughness of the plane, indirectly increase the adhesion area of plane sealant or lubricating oil and improve the adhesion force; and the roughly same grid line structure also increases the aesthetic degree of the surface of the workpiece.
The traditional plane grid pattern processing is finished by scraping by a fitter, and the traditional plane grid pattern processing has high labor intensity and low processing speed. Or knurling is adopted, a numerical control machining center with a complex structure is needed, the labor intensity can be reduced, the machining efficiency is improved, the equipment investment is large, the machining cost is too high, and the popularization is not facilitated.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to provide a milling cutter for processing grid line structure, its recess and plane that can realize processing simultaneously in the grid line structure possess machining efficiency height, advantage that can effective reduce cost.
The purpose of the utility model is realized by adopting the following technical scheme:
a milling cutter for processing net line structure, wherein, net line structure includes recess and plane, including the blade disc, install in first blade and second blade on the blade disc, first blade and second blade encircle the central axis setting of blade disc, first blade is used for the machined surface, the second blade is used for processing the recess, the cutting end of first blade with the cutting end of second blade all protrusion in the terminal surface of blade disc, just the cutting end of second blade compares the cutting end distance of first blade the terminal surface of blade disc is farther.
Further, the first blade comprises a first base body mounted on the cutter head and a first cutter head mounted on the first base body, and the first cutter head is used for processing a plane; the second blade including install in second base member on the blade disc and install in second tool bit on the second base member, the second tool bit is used for processing the recess, the second tool bit than first tool bit distance the terminal surface of blade disc is farther.
Further, the first cutter head is provided with a first cutting edge for processing a plane, and the first cutting edge is of a horizontal structure; the second cutter head is provided with a second cutting edge for processing the groove, the second cutting edge is of a protruding structure matched with the shape of the groove, and the second cutting edge is farther away from the end face of the cutter disc than the first cutting edge.
Further, the first cutter head and/or the second cutter head are made of PCD and are mainly used for aluminum processing.
Furthermore, the milling cutter for machining the grid texture structure further comprises a first adjusting device, the first adjusting device is mounted on the cutter head, and the first adjusting device is used for driving the first blade to move along the axial direction of the cutter head; and/or, a milling cutter for processing grid line structure still includes second adjusting device, second adjusting device install in on the blade disc, second adjusting device is used for the drive the axial displacement of second blade along the blade disc.
Furthermore, the cutter head is provided with a first mounting groove and a second mounting groove which are arranged at intervals along the circumferential direction of the cutter head, the first blade is mounted in the first mounting groove, and the second blade is mounted in the second mounting groove.
Further, the milling cutter for machining the grid texture structure further comprises a first wedge block and a second wedge block, wherein the first wedge block and the first blade are sequentially installed in the first installation groove along the circumferential direction of the cutter head, the first wedge block is provided with a first inclined surface, and the first blade is provided with a second inclined surface matched with the first inclined surface; the second wedge with the second blade is followed the circumference of blade disc install gradually in the second mounting groove, just the second wedge has the third inclined plane, the second blade have with the fourth inclined plane of third inclined plane adaptation.
Furthermore, the cutter head is provided with a first guide groove along the axial direction, the first guide groove is communicated with the first mounting groove, and the first blade is provided with a first guide part in sliding fit with the first guide groove; the cutter head is provided with a second guide groove along the axial direction, the second guide groove is communicated with the second mounting groove, and the second blade is provided with a second guide part in sliding fit with the second guide groove.
Furthermore, the cutter head is further provided with a first positioning groove, the first positioning groove is communicated with the first mounting groove, a first positioning part is arranged on the side surface, opposite to the first inclined surface, of the first wedge-shaped block, and the first positioning part is matched with the first positioning groove; the cutter head has still seted up the second constant head tank, the second constant head tank with second mounting groove intercommunication, the second wedge with have the side that the third inclined plane is relative is equipped with second location portion, second location portion with the cooperation of second constant head tank.
Further, first adjusting device and second adjusting device are all followed the screw that the axial of blade disc set up, the screw spiro union in on the blade disc, the tail end of screw can with first blade or second blade support the top.
Compared with the prior art, the beneficial effects of the utility model reside in that:
through the second blade that has increased the recess that is used for processing the grid line structure on milling cutter for this milling cutter possesses the plane of milling the grid line structure and the recess function of grid line structure, add man-hour, first blade and second blade can move simultaneously, also the plane action of first blade processing grid line structure and the recess action of second blade processing grid line structure can go on simultaneously, then can process out the grid line structure fast, and the machining efficiency is improved, and the cost can be effectively reduced.
Drawings
Fig. 1 is a schematic structural view of a milling cutter for processing a grid texture structure according to the present invention;
fig. 2 is a schematic structural view of a cutter head of the milling cutter for machining a grid texture shown in fig. 1 at a first viewing angle;
FIG. 3 is a schematic view of the impeller shown in FIG. 2 at a first perspective;
fig. 4 is a schematic structural view of a first insert in the milling cutter for machining a grid texture shown in fig. 1;
fig. 5 is a schematic structural view of a second insert in the milling cutter for machining a grid texture shown in fig. 1;
fig. 6 is a schematic structural view of a second wedge block in the milling cutter for machining a grid texture shown in fig. 1;
fig. 7 is a schematic structural diagram of a grid pattern structure according to the present invention;
FIG. 8 is a cross-sectional view taken along the line A-A in the grid texture shown in FIG. 7;
fig. 9 is a structural view of a milling path when machining is performed using the milling cutter shown in fig. 1;
fig. 10 is a schematic plan view of the milling path shown in fig. 9.
In the figure: 1. a cutter head; 11. a second mounting groove; 12. a second guide groove; 13. a second positioning groove; 14. a first connection hole; 15. a second connection hole; 2. a first blade; 21. a first substrate; 211. a second inclined plane; 212. a first guide portion; 22. a first cutter head; 221. a first cutting edge; 3. a second blade; 31. a second substrate; 311. a fourth slope; 312. a second guide portion; 32. a second cutter head; 321. a second cutting edge; 4. a first wedge block; 5. a second wedge block; 51. a third inclined plane; 52. a second positioning portion; 53. a third connection hole; 6. a first adjusting device; 7. a second adjustment device; 100. a grid pattern structure; 101. a plane; 102. a groove; 200. milling a track; 201. a first cut line; 202. a second cutting line; 203. a first knife return line; 204. and a second knife pattern.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.
Referring to fig. 1, there is shown a milling cutter for processing a lattice work structure according to a preferred embodiment of the present invention, wherein, as shown in fig. 7 to 8, the lattice work structure 100 includes a plane 101 and a groove 102, the milling cutter includes a cutter head 1, a plurality of first blades 2 and at least one second blade 3 mounted on the cutter head 1, the first blades 2 and the second blades 3 are disposed around a central axis of the cutter head 1, the first blades 2 and the second blades 3 are protruded from an end surface of the cutter head 1, the first blades 2 are used for processing the plane 101, the second blades 3 are used for processing the groove 102, a cutting end of the first blades 2 and a cutting end of the second blades 3 are protruded from an end surface of the cutter head 1, and the cutting end of the second blades 3 is farther from the end surface of the cutter head 1 than the cutting end of the first blades 2, so that a height difference is formed between the cutting ends of the second blades 3 and the first blades 2, the height difference is adapted to the depth of the groove 102.
The utility model discloses a milling cutter for processing grid line structure's improvement point lies in having increased second blade 3, second blade 3 through having increased the recess 102 that is used for processing grid line structure 100 on milling cutter, make this milling cutter possess the plane 101 that mills grid line structure 100 and the recess 102 function of grid line structure 100 simultaneously, add man-hour, first blade 2 and second blade 3 can the simultaneous movement, also the plane 101 action that first blade 2 processed grid line structure 100 and the recess 102 action that second blade 3 processed grid line structure 100 can go on simultaneously, then can process out grid line structure 100 fast, and the machining efficiency is improved, and the cost can be effectively reduced.
As shown in fig. 4 in particular, the first blade 2 includes a first base body 21 mounted on the cutter head 1 and a first tool bit 22 welded to the first base body 21, the first tool bit 22 has a first cutting edge 221 for machining the flat surface 101, and the first cutting edge 221 has a horizontal structure.
In a preferred embodiment, the first tool tip 22 is made of PCD (polycrystalline diamond compact) so as to improve the surface quality and the machining stability of the machined workpiece.
As shown in fig. 5, the second insert 3 includes a second base 31 mounted on the cutter head 1 and a second cutting head 32 welded to the second base 31, the second cutting head 32 has a second cutting edge 321 for machining the groove 102, the second cutting edge 321 is a convex structure adapted to the shape of the groove 102, and the second cutting edge 321 is farther from the end surface of the cutter head 1 than the first cutting edge 221 so that a height difference is formed between the second cutting edge 321 and the first cutting edge 221, and the height difference is adapted to the depth of the groove 102.
In a preferred embodiment, the second tool tip 32 is made of PCD (polycrystalline diamond compact) so as to improve the surface quality and machining stability of the machined workpiece.
In a preferred embodiment, the milling cutter for machining the grid texture further comprises a first adjusting device 6, the first adjusting device 6 is mounted on the cutter head 1, the first adjusting device 6 is used for driving the first blade 2 to move along the axial direction of the cutter head 1 so as to adjust the axial height of the first blade 2, and then the height difference between the first blade 2 and the second blade 3 is adjustable, that is, the depth of the groove 102 is adjustable, meanwhile, the milling cutter can be applied to a plane 101 only structure due to the fact that the axial height of the first blade 2 is adjustable, and in use, the axial height of the first blade 2 is increased through the first adjusting device 6 so that the first blade 2 is higher than the second blade 3, and the milling cutter can be applied to a plane 101 structure.
To sum up, the configuration of the first adjusting device 6 can enable the milling cutter to flexibly adjust the height difference between the first blade 2 and the second blade 3 according to the depth of the groove 102, and also enable the milling cutter to meet the processing requirement of only processing the structure of the plane 101, so that the milling cutter is more flexible and convenient to use and has a wider application range.
As a preferred embodiment, the milling cutter for machining the grid texture structure further comprises a second adjusting device 7, the second adjusting device 7 is mounted on the cutter head 1, the second adjusting device 7 is used for driving the second blade 3 to move along the axial direction of the cutter head 1 so as to adjust the axial height of the second blade 3, and when the first blade 2 is provided with a plurality of blades, the height difference between the second blade 3 and the first blade 2 can be adjusted only by adjusting the axial height of the second blade 3, so that the use is more convenient and faster, and the debugging efficiency is improved.
As a preferred embodiment, the first adjusting device 6 and the second adjusting device 7 are both screws disposed along the axial direction of the cutter head 1, as shown in fig. 3, the cutter head 1 is provided with a second connecting hole 15 penetrating along the axial direction thereof, the second connecting hole 15 is communicated with the first mounting groove or the second mounting groove 11, the second connecting hole 15 is a threaded hole, the screw is screwed on the threaded hole, and the tail end of the screw can be abutted against the first blade 2 or the second blade 3 to push the first blade 2 or the second blade 3, when in use, the screw is matched with a tool setting gauge or a dial gauge, and the axial height adjustment of the first blade 2 or the second blade 3 is realized by rotating the screw.
As shown in fig. 2 and 3, the cutter head 1 is provided with a first mounting groove and a second mounting groove 11 arranged at intervals along the circumferential direction, the first blade 2 is mounted in the first mounting groove, and the second blade 3 is mounted in the second mounting groove 11.
As a preferred embodiment, the milling cutter for machining the grid texture structure further comprises a first wedge block 4 fixed on the cutter head 1, wherein the first wedge block 4 and the first blade 2 are sequentially installed in a first installation groove along the circumferential direction of the cutter head 1, the first wedge block 4 is provided with a first inclined surface, the first blade 2 is provided with a second inclined surface 211 matched with the first inclined surface, the first wedge block 4 is arranged to be capable of limiting the first blade 2 in the circumferential direction, and the first blade 2 can be firmly installed on the first installation groove through the wedging fit of the first inclined surface and the second inclined surface 211, so that the working stability of the first blade 2 is improved, and the machining quality is improved.
As a preferred embodiment, the cutter head 1 is provided with a plurality of first guide grooves along the axial direction, the first guide grooves are communicated with the first mounting groove, the side surface of the first blade 2 opposite to the second inclined surface 211 is provided with a plurality of first guide parts 212, the first guide parts 212 are in sliding fit with the first guide grooves to guide the first blade 2, so that the axial movement of the first blade 2 along the cutter head 1 is smoother, and meanwhile, the first blade 2 can be prevented from moving along the radial direction of the cutter head 1 by the cooperation of the first guide parts 212 and the first guide grooves, that is, the first blade 2 can be prevented from moving along the radial direction, so that the radial limiting effect is exerted on the first blade 2, which is beneficial to improving the working stability of the first blade 2 and further improving the processing quality.
As a preferred embodiment, the milling cutter for machining the grid texture structure further comprises a second wedge block 5 fixed on the cutter head 1, the second wedge block 5 and the second blade 3 are sequentially installed in the second installation groove 11 along the circumferential direction of the cutter head 1, the second wedge block 5 is provided with a third inclined surface 51, the second blade 3 is provided with a fourth inclined surface 311 matched with the third inclined surface 51, the second blade 3 can be firmly installed on the second installation groove 11 through the wedge-tight fit of the third inclined surface 51 and the fourth inclined surface 311, the second wedge block 5 can perform a circumferential limiting function on the second blade 3, the second blade 3 can be firmly installed on the second installation groove 11 through the wedge-tight fit of the third inclined surface 51 and the fourth inclined surface 311, which is beneficial to improving the working stability of the second blade 3, and further improves the machining quality.
Second guide way 12 has been seted up along its axial to blade disc 1, second guide way 12 is linked together with second mounting groove 11, second blade 3 has second guide part 312 with 12 sliding fit of second guide way, play the effect of direction to second blade 3, make second blade 3 more smooth and easy along the axial displacement of blade disc 1, and simultaneously, second guide part 312 and second guide way 12's cooperation can also avoid second blade 3 along the radial drunkenness of blade disc 1, also play radial spacing effect to second blade 3, be favorable to improving the job stabilization nature of second blade 3, and then improve processingquality.
Continuing to refer to fig. 3, the cutter head 1 is further provided with a first positioning groove, the first positioning groove is communicated with the first mounting groove, as shown in fig. 6, the side surface of the first wedge-shaped block 4 opposite to the side surface with the first inclined surface is provided with a first positioning portion, and the first positioning portion is matched with the first positioning groove to position and radially limit the first wedge-shaped block 4, so that the first blade 2 can be more reliably mounted on the cutter head 1.
With reference to fig. 3, the cutter head 1 is further provided with a second positioning groove 13, the second positioning groove 13 is communicated with the second mounting groove 11, a second positioning portion 52 is arranged on a side surface of the second wedge-shaped block 5 opposite to the side surface with the third inclined surface 51, and the second positioning portion 52 is matched with the second positioning groove 13 to position and radially limit the second wedge-shaped block 5, so that the second blade 3 can be more reliably mounted on the cutter head 1.
Further, the cutter head 1 is further provided with a first through connecting hole 14 along the axial direction thereof, the first connecting hole 14 is communicated with the first mounting groove or the second mounting groove 11, the first wedge-shaped block 4 and the second wedge-shaped block 5 are provided with a third through connecting hole 53, the third through connecting hole 53 is fixedly connected with the first connecting hole 14 through a fastener, wherein the fastener can be a structure comprising a bolt and a nut or can be a connecting column, and the cutter head 1 can be reliably fixed with the first wedge-shaped block 4 or the second wedge-shaped block 5.
The utility model provides a milling cutter's theory of operation:
respectively installing a milling cutter and a workpiece on a cutter bar and a workbench of a milling machine, wherein the rotation center of the milling cutter is vertical to the relative feeding direction of the workpiece, and because regular grid grains are formed on two sides of the center of a cutting path of the milling cutter, the diameter of a cutter head 1 of the milling cutter is at least as large as possible larger than the maximum width of a to-be-processed plane 101 of the workpiece;
determining the rotation speed and the feeding speed of the milling cutter, starting the milling machine, milling the plane 101 in the grid texture structure 100 by using the first blade 2, milling the groove 102 in the grid texture structure 100 by using the second blade 3, forming a cutting texture and a backstitch texture on the surface of the workpiece by the milling action of the second blade 3 on the workpiece, and forming the closed grid texture structure 100 shown in fig. 7 and 8 by crossing between the cutting texture and the backstitch texture, specifically as shown in fig. 9 and 10, wherein a schematic diagram of a milling track 200 formed during milling by using the milling cutter of the present invention is shown, and it can be seen that the first cutting texture 201, the second cutting texture 202, the first backstitch texture 203 and the second backstitch texture 204 enclose to form a complete grid (a grid coated with transverse lines is used in the diagram).
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.
Claims (10)
1. A milling cutter for processing net line structure, wherein, net line structure includes recess and plane, its characterized in that, including the blade disc, install in first blade and second blade on the blade disc, first blade and second blade encircle the central axis setting of blade disc, first blade is used for the machined surface, the second blade is used for processing the recess, the cutting end of first blade with the cutting end of second blade all protrusion in the terminal surface of blade disc, just the cutting end of second blade compares the cutting end distance of first blade the terminal surface of blade disc is farther.
2. The milling cutter for machining a grid texture as set forth in claim 1, wherein the first insert comprises a first base body mounted on the cutter head and a first insert mounted on the first base body, the first insert being for machining a flat surface; the second blade including install in second base member on the blade disc and install in second tool bit on the second base member, the second tool bit is used for processing the recess, the second tool bit than first tool bit distance the terminal surface of blade disc is farther.
3. The milling cutter for machining a grid-work structure as set forth in claim 2, wherein the first head has a first cutting edge for machining a flat surface, the first cutting edge being in a horizontal configuration; the second cutter head is provided with a second cutting edge for processing the groove, the second cutting edge is of a protruding structure matched with the shape of the groove, and the second cutting edge is farther away from the end face of the cutter disc than the first cutting edge.
4. The milling cutter for machining a grid texture as claimed in claim 2, wherein the material of the first cutting head and/or the second cutting head is PCD.
5. The milling cutter for machining a grid structure according to any one of claims 1 to 4, wherein the milling cutter for machining a grid structure further comprises a first adjusting device mounted on the cutter head for driving the first insert to move in an axial direction of the cutter head; and/or, a milling cutter for processing grid line structure still includes second adjusting device, second adjusting device install in on the blade disc, second adjusting device is used for the drive the axial displacement of second blade along the blade disc.
6. The milling cutter for machining a lattice work structure as set forth in claim 5, wherein the cutter head is formed with first and second mounting grooves spaced apart from each other along a circumferential direction thereof, the first insert being mounted to the first mounting groove, and the second insert being mounted to the second mounting groove.
7. The milling cutter for machining the latticed grain structure as claimed in claim 6, further comprising a first wedge block and a second wedge block, wherein said first wedge block and said first insert are sequentially installed in said first installation groove along a circumferential direction of said cutter head, and said first wedge block has a first inclined surface, and said first insert has a second inclined surface adapted to said first inclined surface; the second wedge with the second blade is followed the circumference of blade disc install gradually in the second mounting groove, just the second wedge has the third inclined plane, the second blade have with the fourth inclined plane of third inclined plane adaptation.
8. The milling cutter for machining a grid texture structure as claimed in claim 7, wherein the cutter head is provided with a first guide groove along an axial direction thereof, the first guide groove is communicated with the first mounting groove, and the first blade is provided with a first guide portion in sliding fit with the first guide groove; the cutter head is provided with a second guide groove along the axial direction, the second guide groove is communicated with the second mounting groove, and the second blade is provided with a second guide part in sliding fit with the second guide groove.
9. The milling cutter for machining a grid texture structure as claimed in claim 7, wherein the cutter head is further provided with a first positioning groove, the first positioning groove is communicated with the first mounting groove, a side surface of the first wedge-shaped block opposite to the side surface with the first inclined surface is provided with a first positioning portion, and the first positioning portion is matched with the first positioning groove; the cutter head has still seted up the second constant head tank, the second constant head tank with second mounting groove intercommunication, the second wedge with have the side that the third inclined plane is relative is equipped with second location portion, second location portion with the cooperation of second constant head tank.
10. The milling cutter according to claim 5, wherein the first and second adjusting means are screws disposed along an axial direction of the cutter head, the screws are screwed to the cutter head, and a tail end of the screw is capable of abutting against the first or second insert.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022148743.7U CN214079463U (en) | 2020-09-25 | 2020-09-25 | Milling cutter for processing grid texture structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022148743.7U CN214079463U (en) | 2020-09-25 | 2020-09-25 | Milling cutter for processing grid texture structure |
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| CN214079463U true CN214079463U (en) | 2021-08-31 |
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| CN202022148743.7U Active CN214079463U (en) | 2020-09-25 | 2020-09-25 | Milling cutter for processing grid texture structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115213469A (en) * | 2022-08-31 | 2022-10-21 | 青岛青特众力车桥有限公司 | Plane machining line with high sealing capacity and manufacturing method thereof |
-
2020
- 2020-09-25 CN CN202022148743.7U patent/CN214079463U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115213469A (en) * | 2022-08-31 | 2022-10-21 | 青岛青特众力车桥有限公司 | Plane machining line with high sealing capacity and manufacturing method thereof |
| CN115213469B (en) * | 2022-08-31 | 2024-03-19 | 青岛青特众力车桥有限公司 | High-sealing-capability plane processing texture and manufacturing method thereof |
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Effective date of registration: 20230615 Address after: 341000 Dongshan Furniture Industrial Park, Nankang Economic Development Zone, Ganzhou City, Jiangxi Province Patentee after: Ganzhou pushide Tools Co.,Ltd. Address before: 518000 floor 2, building 42, Rentian Community Industrial Zone, Fuyong street, Bao'an District, Shenzhen, Guangdong Patentee before: SHENZHEN LEEPPLE TOOLS TECHNOLOGY Co.,Ltd. |
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