TWM446038U - Router structure - Google Patents
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- TWM446038U TWM446038U TW101216774U TW101216774U TWM446038U TW M446038 U TWM446038 U TW M446038U TW 101216774 U TW101216774 U TW 101216774U TW 101216774 U TW101216774 U TW 101216774U TW M446038 U TWM446038 U TW M446038U
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- 238000005520 cutting process Methods 0.000 claims abstract description 37
- 238000003801 milling Methods 0.000 claims description 36
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 8
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 229910003460 diamond Inorganic materials 0.000 claims description 4
- 239000010432 diamond Substances 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 210000001015 abdomen Anatomy 0.000 claims description 3
- 150000001722 carbon compounds Chemical class 0.000 claims description 3
- 150000002736 metal compounds Chemical class 0.000 claims description 3
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 claims description 2
- 239000011247 coating layer Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- UQZIWOQVLUASCR-UHFFFAOYSA-N alumane;titanium Chemical compound [AlH3].[Ti] UQZIWOQVLUASCR-UHFFFAOYSA-N 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 abstract description 5
- 239000002184 metal Substances 0.000 abstract description 5
- 239000000463 material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000003754 machining Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229910010037 TiAlN Inorganic materials 0.000 description 1
- 230000003187 abdominal effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- Milling Processes (AREA)
- Knives (AREA)
Abstract
Description
本創作係有關一種銑刀結構，特別是一種可避免於加工成型過程中造成沾黏現象之銑刀結構。This creation is about a milling cutter structure, especially a milling cutter structure that avoids sticking during machining.
銑刀係採用一種高硬度的碳化鎢材料所製成，銑刀在高速旋轉下，以其刃部對待加工物銑切，螺旋溝部則用以排出切屑。The milling cutter is made of a high-hardness tungsten carbide material. The milling cutter cuts the workpiece with its blade at high speed and the spiral groove is used to discharge the chips.
圖1所示為習知之銑刀結構10，其具有一柄部12及一刃部14。刃部14具有三道以上溝部18環繞排列於刃部14之柱面，其中每兩個相鄰的溝部18之間並分別形成有側刃16。習知銑刀通常具有4或5道側刃，在溝部及側刃數量較多的情形下，溝部之寬度較小，在進行切削加工時，因刀具高速旋轉與待加工物摩擦所產生之熱量因塞屑而不易散逸，且溝部之寬度較小會使排屑空間不足而影響排屑性能。1 shows a conventional milling cutter structure 10 having a shank portion 12 and a blade portion 14. The blade portion 14 has three or more groove portions 18 circumferentially arranged on the cylindrical surface of the blade portion 14, and a side edge 16 is formed between each of the two adjacent groove portions 18, respectively. Conventional milling cutters usually have 4 or 5 side cutting edges. In the case of a large number of grooves and side edges, the width of the groove portion is small, and the heat generated by the high-speed rotation of the tool and the workpiece to be processed is caused by the cutting during the cutting process. The chips are not easily dissipated, and the small width of the groove portion causes insufficient chip evacuation space to affect the chip discharge performance.
另，習知銑刀之側刃較寬，其與待加工物所接觸之面積較大，在銑切作業產生之高溫下，尤以在加工軟性金屬時易造成側刃沾黏切屑，致使切屑更不易排出並且影響散熱。In addition, the side cutter of the conventional milling cutter is wide, and the area of contact with the workpiece to be processed is large, and the high temperature generated during the milling operation, especially when processing the soft metal, is easy to cause the side edge to stick to the chip, which makes the chip more difficult. Discharge and affect heat dissipation.
為了解決上述問題，本創作目的之一係提出一種銑刀結構，可避免於加工成型過程中造成沾黏現象。In order to solve the above problems, one of the purposes of the present invention is to propose a milling cutter structure, which can avoid sticking during the forming process.
本創作目的之一係提出一種銑刀結構，具有增加銑刀之排屑功能，且提升加工品質之優點。One of the purposes of this creation is to propose a milling cutter structure, which has the advantages of increasing the chip removal function of the milling cutter and improving the processing quality.
為了達到上述目的，本創作一實施例之銑刀結構，包含：一刀柄 部以及一刀刃部設置於刀柄部之一端，刀刃部的前端形成一端面切削刃結構，刀刃部的外表面設置二螺旋溝槽以形成對稱之二螺旋側刃，二螺旋側刃之間具有一間距，且每一螺旋側刃具有一厚度，間距大於厚度，且間距與厚度的比值大於或等於2。In order to achieve the above object, a milling cutter structure according to an embodiment of the present invention comprises: a handle And a blade portion is disposed at one end of the shank portion, the front end of the blade portion forms an end face cutting edge structure, and the outer surface of the blade portion is provided with two spiral grooves to form a symmetrical spiral side edge, and the two spiral side edges have A pitch, and each spiral side edge has a thickness, the pitch is greater than the thickness, and the ratio of the pitch to the thickness is greater than or equal to two.
圖2所示為本創作一實施例銑刀結構示意圖。於本實施例中，如圖2所示，銑刀結構20包含一刀柄部22，以及一刀刃部24設置於刀柄部22的一端，刀刃部24的前端形成一端面切削刃結構26，刀刃部24的外表面由刀刃部24前端往刀柄部22方向設置二螺旋溝槽28、28’，以形成二對稱之螺旋側刃30、30’，二螺旋側刃30、30’之間具有一間距L，又每一螺旋側刃30、30’具有一厚度l，其中間距L大於厚度l，且間距L與厚度l的比值大於或等於2。FIG. 2 is a schematic view showing the structure of a milling cutter according to an embodiment of the present invention. In the present embodiment, as shown in FIG. 2, the milling cutter structure 20 includes a shank portion 22, and a blade portion 24 is disposed at one end of the shank portion 22. The front end of the blade portion 24 forms an end face cutting edge structure 26, the blade edge The outer surface of the portion 24 is provided with two spiral grooves 28, 28' in the direction of the shank portion 22 from the front end of the blade portion 24 to form two symmetrical spiral side edges 30, 30', and between the two spiral side edges 30, 30' A spacing L, and each of the spiral side edges 30, 30' has a thickness l, wherein the spacing L is greater than the thickness l, and the ratio of the spacing L to the thickness l is greater than or equal to two.
可瞭解的，二螺旋側刃30、30’之間距L即為每一螺旋溝槽28、28’之寬度，且螺旋側刃30、30’之厚度l係指每一螺旋側刃30、30’之兩相對側壁的距離，亦即在本創作中，由於螺旋側刃30、30’的厚度l很小，因此當利用此銑刀結構20加工成型軟性金屬時，可減少螺旋側刃30、30’與軟性金屬的接觸面積，以避免加工成型過程中，造成沾黏現象；再者，由於螺旋溝槽28、28’之寬度的加大，可增加排屑空間，以加強排屑性能，且避免塞屑。另外，上述之螺旋側刃30、30’之螺旋傾角θ 1的角度介於15度至60度之間，且較佳者為30度。It can be understood that the distance L between the two spiral side edges 30, 30' is the width of each spiral groove 28, 28', and the thickness l of the spiral side edges 30, 30' refers to each spiral side edge 30, 30. The distance between the two opposite side walls, that is, in the present creation, since the thickness l of the spiral side edges 30, 30' is small, when the soft metal is formed by using the milling cutter structure 20, the spiral side edge 30 can be reduced. 30' contact area with soft metal to avoid sticking during processing; furthermore, due to the increased width of spiral grooves 28, 28', the chip evacuation space can be increased to enhance the chip removal performance. And avoid spillage. Further, the angle of the spiral inclination angle θ 1 of the above-described spiral side edges 30, 30' is between 15 degrees and 60 degrees, and preferably 30 degrees.
其中，在刀刃部24之外表面可包覆一覆膜層(圖中未示)，其材質係為金屬化合物、碳化合物或由以上成分所組成之混合物，且較佳者為氮化鈦(TiN)、氮化鋁鈦(TiAlN)、鑽石鍍膜(Diamond Coating)或類鑽石鍍膜(Diamond like Coating)。再者，刀柄部22及刀刃部24之間可為以碳化鎢棒材一體成型者，抑或為利用焊接或黏著劑等接合方式將碳化鎢材質之刀柄部22及碳化鎢材質之刀刃部24連接在一起，抑 或為利用焊接或黏著劑等接合方式將不鏽鋼材質之刀柄部22及碳化鎢材質之刀刃部24連接在一起。。Wherein, the outer surface of the blade portion 24 may be coated with a coating layer (not shown), which is made of a metal compound, a carbon compound or a mixture of the above components, and preferably titanium nitride ( TiN), TiAlN, Diamond Coating or Diamond like Coating. Further, the shank portion 22 and the blade portion 24 may be integrally formed of a tungsten carbide bar, or may be a knives portion 22 made of a tungsten carbide material or a blade portion made of a tungsten carbide material by a bonding method such as welding or an adhesive. 24 connected together, Alternatively, the shank portion 22 of the stainless steel material and the blade portion 24 made of a tungsten carbide material are joined together by a joining method such as welding or an adhesive. .
接續上述說明，在上述實施例中，請同時參閱圖2及圖3所示，端面切削刃結構26係為一六面型刀面結構，其係包含二主刀面32、32’、二副刀面34、34’及二輔刀面36、36’，二主刀面32、32’之間、二副刀面34、34’之間及二輔刀面36、36’之間相對於刀刃部24之軸心O呈對稱且偏斜設計。二主刀面32、32’各具有一刀腹邊321、321’，二副刀面34、34’分別傾斜設置於主刀面32、32’不具有刀腹邊321、321’的一側，每一輔刀面36、36’分別傾斜設置於副刀面34、34’與另一主刀面32’、32之間。其中二主刀面32、32’之二刀尖部322、322’分別往遠離刀柄部22方向傾斜使二主刀面32、32’之間具有一頂內角θ2，二副刀面34、34’的外週緣341、341’分別往刀柄部22方向傾斜，二輔刀面36、36’的外週緣361、361’亦往刀柄部22方向傾斜，且輔刀面36、36’往刀柄部22方向的傾斜度陡於副刀面34、34’的傾斜度，以便藉由副刀面34、34’及輔刀面36、36’的設計增加銑刀結構20的排屑功能。Following the above description, in the above embodiment, please refer to FIG. 2 and FIG. 3 at the same time, the end face cutting edge structure 26 is a six-sided blade surface structure, which comprises two main blades 32, 32' and two pairs of blades. The faces 34, 34' and the two minor faces 36, 36', between the two main faces 32, 32', between the two sets of faces 34, 34' and between the two minor faces 36, 36' are opposite to the cutting edge The axis O of the 24 is symmetrical and skewed. The two main flank faces 32, 32' each have a flank 321 and 321', and the two flank faces 34, 34' are respectively disposed obliquely on the side of the main flank 32, 32' which does not have the flank 321 and 321 ', each The minor faces 36, 36' are disposed obliquely between the minor faces 34, 34' and the other minor faces 32', 32, respectively. The two cutting edge portions 322, 322' of the two main cutting faces 32, 32' are inclined away from the shank portion 22 respectively to have a top internal angle θ2 between the two main cutting faces 32, 32', and the two minor cutting faces 34, 34 The outer peripheral edges 341, 341' are inclined toward the shank portion 22, and the outer peripheral edges 361, 361' of the second minor knives 36, 36' are also inclined toward the shank portion 22, and the minor faces 36, 36' are The inclination of the shank portion 22 is steeper than the inclination of the minor knives 34, 34' to increase the chip removal function of the milling cutter structure 20 by the design of the secondary knives 34, 34' and the minor knives 36, 36'. .
其中，二主刀面32、32’所形成之頂內角θ 2係介於120度至180度之間，每一主刀面32、32’之刀腹邊321、321’在刀尖部322、322’之切線與刀刃部24之徑向線具有一腹離角θ 3(僅標示於主刀面32，主刀面32’亦同)，腹離角θ 3的範圍介於0度至30度之間，且較佳者為5度；每一主刀面32、32’之刀背邊323、323’與刀刃部24之旋轉切線具有一背離角θ4(僅標示於主刀面32，主刀面32’亦同)，背離角θ4的範圍介於5度至60度之間，且較佳者為30度。Wherein, the top inner angle θ 2 formed by the two main cutter faces 32, 32' is between 120 degrees and 180 degrees, and the blade edge portions 321 and 321' of each of the main cutter faces 32, 32' are at the cutting edge portion 322, The tangential line of 322' and the radial line of the blade portion 24 have a ventral angle θ 3 (only indicated on the main flank 32, the main flank 32' is the same), and the ventral angle θ 3 ranges from 0 to 30 degrees. And preferably 5 degrees; the back edges 323, 323' of each of the main faces 32, 32' and the cutting tangent of the blade portion 24 have a deviation angle θ4 (only indicated on the main face 32, the main face 32' Similarly, the range of the off-angle θ4 is between 5 and 60 degrees, and preferably 30 degrees.
於另一實施例中，如圖4及圖5所示，端面切削刃結構26係為一兩面型刀面結構，其係包含二刀面38、38’，二刀面38、38’相對於刀刃部24之一軸心O各自對稱且偏斜，其中每一刀面38、38’之一刀尖部381、381’分別往遠離刀柄部22方向傾斜，使二刀面38、38’之間具有一頂內角θ 2，頂內角θ 2係介於120度至180度之間。又每一 刀面38、38’之刀腹邊382、382’在刀尖部381、381’之切線與刀刃部24之徑向線具有一腹離角θ 3(僅標示於主刀面38，主刀面38’亦同)，腹離角θ 3的範圍介於0度至30度之間，且較佳者為5度，每一刀面38、38’之刀背邊383、383’與刀刃部24之旋轉切線具有一背離角θ4(僅標示於主刀面38，主刀面38’亦同)，背離角θ4的範圍介於5度至60度之間，且較佳者為30度。In another embodiment, as shown in FIG. 4 and FIG. 5, the end face cutting edge structure 26 is a two-sided knife face structure, which comprises a second face 38, 38', and the second face 38, 38' is opposite to One of the axes O of the blade portions 24 is symmetrical and skewed, wherein the blade tips 381, 381' of each of the blade faces 38, 38' are inclined away from the shank portion 22, respectively, so that between the flank faces 38, 38' There is a top internal angle θ 2 and the top internal angle θ 2 is between 120 degrees and 180 degrees. Further, the flank 382, 382' of each of the knives 38, 38' has a belly angle θ 3 at the tangent of the cutting edge portion 381, 381' and the radial line of the blade portion 24 (only indicated on the main blade face 38, the main knife The face 38' is also the same), the range of the abdomen angle of departure θ 3 is between 0 degrees and 30 degrees, and preferably 5 degrees, the back sides 383, 383' and the blade portion 24 of each of the faces 38, 38' The rotational tangent has a divergence angle θ4 (only indicated for the main flank 38, the main flank 38' is the same), and the range of the deviation angle θ4 is between 5 and 60 degrees, and preferably 30 degrees.
在本創作中，藉由銑刀結構之厚度很小的螺旋側刃，減少側刃與軟性金屬的接觸面積，以避免加工成型過程中，造成沾黏現象；同時藉由寬度很大之螺旋溝槽增加排屑空間，以加強排屑性能。再者，利用端面切削刃結構中之副刀面與輔刀面的往刀柄部方向傾斜，更可增加銑刀的排屑功能，以避免加工過程中因塞屑現象影響加工品質。In this creation, by the spiral side edge of the milling cutter structure having a small thickness, the contact area of the side edge with the soft metal is reduced to avoid sticking during the forming process; and at the same time, the spiral groove is made by a large width. The trough increases the chip evacuation space to enhance chip evacuation performance. Furthermore, the use of the sub-blade surface of the end face cutting edge structure and the minor blade surface in the direction of the shank portion can increase the chip removal function of the milling cutter to avoid the influence of the chipping phenomenon on the processing quality during the machining process.
以上所述之實施例僅係為說明本創作之技術思想及特點，其目的在使熟習此項技藝之人士能夠瞭解本創作之內容並據以實施，當不能以之限定本創作之專利範圍，即大凡依本創作所揭示之精神所作之均等變化或修飾，仍應涵蓋在本創作之專利範圍內。The embodiments described above are only for explaining the technical idea and characteristics of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement them according to the scope of the patent. That is, the equivalent changes or modifications made by the people in accordance with the spirit revealed by this creation should still be covered by the scope of the patent of this creation.
10‧‧‧銑刀結構10‧‧‧ Milling cutter structure
12‧‧‧柄部12‧‧‧ handle
14‧‧‧刃部14‧‧‧blade
16‧‧‧側刃16‧‧‧Side blade
18‧‧‧溝部18‧‧‧Ditch Department
20‧‧‧銑刀結構20‧‧‧ Milling cutter structure
22‧‧‧刀柄部22‧‧‧Knife
24‧‧‧刀刃部24‧‧‧Knife
26‧‧‧端面切削刃結構26‧‧‧ Face cutting edge structure
28、28’‧‧‧螺旋溝槽28, 28’‧‧‧Spiral groove
30、30’‧‧‧螺旋側刃30, 30'‧‧‧Spiral side blade
L‧‧‧間距L‧‧‧ spacing
l‧‧‧厚度L‧‧‧thickness
θ1‧‧‧螺旋傾角Θ1‧‧‧spiral dip
32、32’‧‧‧主刀面32, 32'‧‧‧ main knives
321、321’‧‧‧刀腹邊321, 321'‧‧‧ knives
322、322’‧‧‧刀尖部322, 322’‧‧‧The tip of the knife
323、323’‧‧‧刀背邊323, 323’‧‧‧ knife back
34、34’‧‧‧副刀面34, 34’‧‧‧
341、341’‧‧‧外週緣341, 341’‧‧‧ outer periphery
36、36’‧‧‧輔刀面36, 36'‧‧‧Auxiliary knife face
361、361’‧‧‧外週緣361, 361’‧‧‧ outer periphery
O‧‧‧軸心O‧‧‧Axis
θ2‧‧‧頂內角Θ2‧‧‧ top angle
θ3‧‧‧腹離角θ3‧‧‧Abdominal angle
θ4‧‧‧背離角Θ4‧‧‧ Deviation angle
38、38’‧‧‧刀面38, 38’‧‧‧ knives
381、381’‧‧‧刀尖部381, 381'‧‧‧ cutting edge
382、382’‧‧‧刀腹邊382, 382' ‧ ‧ knives
383、383’‧‧‧刀背邊383, 383’ ‧ ‧ back
圖1所示為習知一種銑刀結構示意圖。FIG. 1 is a schematic view showing the structure of a conventional milling cutter.
圖2所示為本創作一實施例銑刀結構示意圖。FIG. 2 is a schematic view showing the structure of a milling cutter according to an embodiment of the present invention.
圖3所示為本創作一實施例銑刀結構之端面切削刃結構示意圖。FIG. 3 is a schematic view showing the structure of the end cutting edge of the milling cutter structure according to an embodiment of the present invention.
圖4所示為本創作又一實施例銑刀結構示意圖。FIG. 4 is a schematic view showing the structure of a milling cutter according to still another embodiment of the present invention.
圖5所示為本創作又一實施例銑刀結構之端面切削刃結構示意圖。FIG. 5 is a schematic view showing the structure of the end cutting edge of the milling cutter structure according to still another embodiment of the present invention.
20‧‧‧銑刀結構20‧‧‧ Milling cutter structure
22‧‧‧刀柄部22‧‧‧Knife
24‧‧‧刀刃部24‧‧‧Knife
26‧‧‧端面切削刃結構26‧‧‧ Face cutting edge structure
28、28’‧‧‧螺旋溝槽28, 28’‧‧‧Spiral groove
30、30’‧‧‧螺旋側刃30, 30'‧‧‧Spiral side blade
L‧‧‧間距L‧‧‧ spacing
l‧‧‧厚度L‧‧‧thickness
θ1‧‧‧螺旋傾角Θ1‧‧‧spiral dip
34‧‧‧副刀面34‧‧‧Sub-blade
341‧‧‧外週緣341‧‧‧ outer periphery
36‧‧‧輔刀面36‧‧‧Auxiliary knife face
361‧‧‧外週緣361‧‧‧ outer periphery
θ2‧‧‧頂內角Θ2‧‧‧ top angle
Claims (10)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW101216774U TWM446038U (en) | 2012-08-31 | 2012-08-31 | Router structure |
| CN 201320113973 CN203109326U (en) | 2012-08-31 | 2013-03-13 | Milling cutter structure |
| JP2013001700U JP3183954U (en) | 2012-08-31 | 2013-03-27 | Router structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW101216774U TWM446038U (en) | 2012-08-31 | 2012-08-31 | Router structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| TWM446038U true TWM446038U (en) | 2013-02-01 |
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ID=48193486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| TW101216774U TWM446038U (en) | 2012-08-31 | 2012-08-31 | Router structure |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP3183954U (en) |
| CN (1) | CN203109326U (en) |
| TW (1) | TWM446038U (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103433542B (en) * | 2013-08-30 | 2016-06-22 | 深圳市金洲精工科技股份有限公司 | A kind of accurate milling cutter |
| CN103567515B (en) * | 2013-11-11 | 2016-09-14 | 中国南方航空工业(集团)有限公司 | The processing method of cyclone |
| CN106583803A (en) * | 2015-10-14 | 2017-04-26 | 天钻科技股份有限公司 | Diamond coated cutting tool and method for making the same |
| TWI619572B (en) * | 2016-07-22 | 2018-04-01 | 創國興業有限公司 | Drill structure |
| JP2019534163A (en) * | 2016-10-10 | 2019-11-28 | 上海精▲靱▼激光科技有限公司Ｓｈａｎｇｈａｉ Ｊｉｎｇｒｅｎ Ｌａｓｅｒ Ｔｅｃｈｎｏｌｏｇｙ Ｃｏ． Ｌｔｄ． | Cemented carbide cutting member, manufacturing method thereof, and use thereof |
| CN108556078A (en) * | 2018-06-21 | 2018-09-21 | 贵州六合门业有限公司 | Round log recessing knife |
| CN110744082A (en) * | 2019-11-29 | 2020-02-04 | 贵州西南工具(集团)有限公司 | Novel rhombus numerical control blade for slotting |
| CN115635136B (en) * | 2022-09-09 | 2025-12-09 | 天水华天集成电路包装材料有限公司 | IC protective belt multi-row slitting burr-free cutter structure and application thereof |
-
2012
- 2012-08-31 TW TW101216774U patent/TWM446038U/en not_active IP Right Cessation
-
2013
- 2013-03-13 CN CN 201320113973 patent/CN203109326U/en not_active Expired - Lifetime
- 2013-03-27 JP JP2013001700U patent/JP3183954U/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP3183954U (en) | 2013-06-06 |
| CN203109326U (en) | 2013-08-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MM4K | Annulment or lapse of a utility model due to non-payment of fees |