CN114770763B - Method for forming square holes in plate - Google Patents
Method for forming square holes in plate Download PDFInfo
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- CN114770763B CN114770763B CN202210500833.9A CN202210500833A CN114770763B CN 114770763 B CN114770763 B CN 114770763B CN 202210500833 A CN202210500833 A CN 202210500833A CN 114770763 B CN114770763 B CN 114770763B
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- plate
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- square hole
- hole
- holes
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000005520 cutting process Methods 0.000 claims abstract description 43
- 239000011435 rock Substances 0.000 claims description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000005553 drilling Methods 0.000 claims description 9
- 239000000919 ceramic Substances 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 238000000227 grinding Methods 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 239000004579 marble Substances 0.000 claims description 7
- 238000009837 dry grinding Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 239000010438 granite Substances 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000005034 decoration Methods 0.000 abstract description 3
- 238000005498 polishing Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 241000826860 Trapezium Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/14—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by boring or drilling
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
The utility model provides a method of panel open square hole relates to the home decoration field, makes the mark at the position that panel needs the trompil earlier, then the electric hand drill drills four round holes in the four corners position that needs the trompil to cut two crisscross straight lines along diagonal direction with manual cutting machine, cut along the outer lane of four round holes at last and obtain the square hole, thereby reach the release cutting stress, avoid the damaged condition of on-the-spot cutting. The method can greatly reduce the damage of the on-site square holes of various furniture decorative plates, and save the installation cost for customers. The method has low processing cost and low process difficulty, and has no high requirements on processing technology and processing equipment.
Description
Technical Field
The application relates to the field of home decoration, in particular to a method for forming square holes in a plate.
Background
The rock plate is made of natural raw materials through special process, pressing by means of a press with more than ten thousand tons, and high-temperature firing at more than 1200 ℃ by matching with advanced production technology, and is similar to stone, but the hardness and other properties are far higher than those of stone. Most rock plates are required to be provided with socket box holes during installation, and if the holes are provided with water cutters in factories, the risk of breakage exists in the transportation process, so the rock plates are provided with holes on the installation site. However, if the technique and technique for installing the master hole are not good, the rock plate is easy to break, and great economic loss is caused.
The current hole opening method for the installation master is as follows: and drawing the position of the opening, and directly opening the opening by using a portable cutting machine. The pore opening method is relatively direct and has relatively short processing time. However, the socket holes are basically formed in the positions of the adjacent corners of the rock plate, so that the rock plate is easily broken by directly drilling holes. And the rock plate is generally provided with a plurality of continuous lines, one set is a ground color, if one rock plate breaks, the whole rock plate is scrapped, one set needs to be purchased again, the loss is very large, and the cost is high.
Disclosure of Invention
The purpose of the application is to provide a method for opening square holes in a plate, and aims to solve the problem that the existing rock plate is easy to damage due to the fact that the hole is opened in a construction site.
To achieve the above object, the present application provides a method for forming square holes in a plate, including:
drawing the square hole shape at the position of the plate needing to be perforated;
drilling a round hole at the inner corners of the four corners of the square hole shape, wherein each round hole comprises an inner arc facing the center of the square hole shape and an outer arc opposite to the inner arc;
cutting wire grooves in the square hole shape, wherein the wire grooves are respectively connected with the inner arcs of the round holes in opposite angles to form an X shape;
and cutting along the outer circular arc of the round hole to obtain the square hole.
Preferably, the metal sheet is attached to the square hole shape at a place other than the inner corners of the four corners for reinforcement.
Preferably, the metal sheet is an L-shaped iron sheet.
Preferably, the cutting is performed along an outer arc of the round hole to obtain the square hole, which specifically includes:
and (3) drawing an outer frame straight line of the square hole along the outer arc of the round hole, and cutting along the outer frame straight line to obtain the square hole.
Preferably, the square hole and the straight line of the outer frame of the square hole are respectively drawn on two sides of the plate.
Preferably, the round hole is drilled by using an electric hand drill, and an included angle between a drill bit of the electric hand drill and the plate is 50-70 degrees when the electric hand drill drills.
Preferably, the diameter of the round hole is 10-20 mm.
Preferably, the round hole is opened while water is added for cooling; the X-shaped wire groove and the outer frame are cut while water is added for cooling.
Preferably, after the square hole is obtained, the rough edge of the square hole is repaired by a grinding wheel with 50-100 meshes, and then the edge of the square hole is polished to be smooth by a dry grinding disc with 150-250 meshes.
Preferably, the slab is selected from any one of rock slab, ceramic tile, marble slab, granite slab.
Compared with the prior art, the beneficial effects of this application include:
according to the method for opening the square holes of the plate, firstly, marks are made on the positions, needing to be opened, of the plate, then, four round holes are drilled on the four corners, needing to be opened, of the plate by the electric hand drill, two crossed straight lines are cut along the diagonal direction by the manual cutting machine, finally, the square holes are cut along the outer rings of the four round holes, and therefore cutting stress is released, and the situation of site cutting damage is avoided. The method can greatly reduce the damage of the on-site square holes of various furniture decorative plates, and save the installation cost for customers. The method has low processing cost and low process difficulty, and has no high requirements on processing technology and processing equipment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate certain embodiments of the present application and therefore should not be considered as limiting the scope of the present application.
FIG. 1 is a schematic flow chart of a method for forming square holes in a plate material according to the present application;
FIG. 2 is a schematic illustration of a square hole shape drawn in a sheet material;
FIG. 3 is a schematic illustration of four corner-drilled round holes in a square hole shape;
FIG. 4 is a schematic view of connecting diagonal circular holes in a square hole shaped cutting wire chase;
FIG. 5 is a schematic view of square holes cut in a sheet material;
fig. 6 is a schematic view of an outer frame straight line for cutting square holes.
Detailed Description
The term as used herein:
"prepared from … …" is synonymous with "comprising". The terms "comprising," "including," "having," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, step, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, step, method, article, or apparatus.
The conjunction "consisting of … …" excludes any unspecified element, step or component. If used in a claim, such phrase will cause the claim to be closed, such that it does not include materials other than those described, except for conventional impurities associated therewith. When the phrase "consisting of … …" appears in a clause of the claim body, rather than immediately following the subject, it is limited to only the elements described in that clause; other elements are not excluded from the stated claims as a whole.
When an equivalent, concentration, or other value or parameter is expressed as a range, preferred range, or a range bounded by a list of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when ranges of "1 to 5" are disclosed, the described ranges should be construed to include ranges of "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a numerical range is described herein, unless otherwise indicated, the range is intended to include its endpoints and all integers and fractions within the range.
In these examples, the parts and percentages are by mass unless otherwise indicated.
"parts by mass" means a basic unit of measurement showing the mass ratio of a plurality of components, and 1 part may be any unit mass, for example, 1g may be expressed, 2.689g may be expressed, and the like. If we say that the mass part of the a component is a part and the mass part of the B component is B part, the ratio a of the mass of the a component to the mass of the B component is represented as: b. alternatively, the mass of the A component is aK, and the mass of the B component is bK (K is an arbitrary number and represents a multiple factor). It is not misunderstood that the sum of the parts by mass of all the components is not limited to 100 parts, unlike the parts by mass.
"and/or" is used to indicate that one or both of the illustrated cases may occur, e.g., a and/or B include (a and B) and (a or B).
The application provides a method for forming square holes in a plate, wherein the plate is selected from any one of a rock plate, a ceramic tile, a marble plate and a granite plate, and the plates are used for common home decoration. The square holes can be square, rectangular or other irregular square, such as trapezium, etc., and mainly refer to hole shapes with included angles, rather than arc-shaped edges like round holes. Referring to fig. 1, the method for forming square holes on a plate includes:
s100: and drawing the square hole shape at the position of the plate, which is required to be perforated.
Specifically, referring to fig. 2, the black square frame in fig. 2 is a square hole, and the square hole may be rectangular or trapezoidal, and in other embodiments, the square hole may be drawn on the front or back of the board, and the square hole is drawn to define an opening position, where the square hole is obtained later.
S200: and drilling a round hole at the inner corners of the four corners of the square hole shape, wherein each round hole comprises an inner circular arc facing the center of the square hole shape and an outer circular arc opposite to the inner circular arc.
Specifically, referring to fig. 3, round holes are drilled at four right angles of the square hole shape, and the round holes are drilled at right angles of the square hole, so that stress at the right angles can be reduced when the square hole is opened, and the possibility of plate breakage is reduced. For convenience of distinction, the round hole is divided into an inner arc facing the center of the square hole shape and an outer arc opposite to the inner arc, for example, the round hole may be divided into two halves in a diagonal direction of the square hole shape, a round hole side facing a half of the center of the square hole shape is the inner arc, and the other half is the outer arc, which is tangent to a right-angle side of the square hole shape.
Specifically, the round hole is drilled by using an electric hand drill, and the included angle between the drill bit of the electric hand drill and the plate is 50-70 degrees when the drill bit is drilled, so that the drill bit can be prevented from slipping on the surface of the plate. The angle of the drill bit with the sheet material during drilling may be, for example, (50, 52, 55, 56, 58, 60, 62, 63, 64, 66, 68 or 70) degrees. The round hole is water-cooled while being perforated, so that the appearance of the plate is prevented from being influenced by high temperature in the drilling process.
Preferably, the diameter of the round hole is 10-20 mm. The diameter of the round hole is the same as the size of the drill bit of the electric hand drill, the diameter of the round hole is determined by the size of a square hole needing to be drilled, and the larger the square hole is, the larger the diameter of the round hole is, the smaller the square hole is, and the smaller the diameter of the round hole is.
Preferably, in order to improve the stability of the plate material at the square hole opening position, a metal sheet is used to be stuck at the positions except for the inner angles of the four corners of the square hole shape for reinforcement. The metal sheet is mainly in a shape matching four corners of the square hole shape, for example, for square or rectangular square hole shapes, the metal sheet can be L-shaped and attached to the outer sides of four right angles.
Preferably, the metal sheet is an L-shaped iron sheet, and the iron sheet is low in cost.
S300: cutting wire grooves in the square hole shape, wherein the wire grooves are respectively connected with the inner arcs of the round holes at opposite angles to form an X-shaped structure.
Specifically, referring to fig. 4, the cutting slot is connected with the diagonal round hole, so that the stress at the right angle of the square hole can be further released, and the possibility of plate breakage is further reduced. Preferably, the wire chase is in the shape of a groove formed in the sheet material, the wire chase is not cut through to the other side of the sheet material, and if the wire chase is cut through to the other side of the sheet material, the balance of the subsequent square hole cutting is affected. The wire slot is cut by using a portable cutting machine, and the wire slot is ensured not to cut an outer circular arc of the round hole, so that the square hole shape is damaged. The X-shaped line groove is cut while water is added for cooling, so that the appearance of the plate is prevented from being damaged by high temperature when the line groove is cut.
S400: and cutting along the outer circular arc of the round hole to obtain the square hole.
Specifically, referring to fig. 4 and 5, the outer arcs of the round holes are cut along, so that the outer arcs of the round holes are connected, and according to the standard condition of fig. 4, the square holes are obtained by cutting according to the drawn lines of the square hole shapes. During cutting, water is added while cutting.
However, in another embodiment, as shown in fig. 6, when the round hole is drilled, the round hole is not formed to have a standard shape that only fills up four corners of the square hole, so in this case, an outer frame straight line of the square hole may be drawn along an outer arc of the round hole, and cutting may be performed along the outer frame straight line to obtain the square hole, where the square hole is slightly deviated from the drawn square hole. The outer frame straight line cuts simultaneously and adds water cooling, prevents that the cutting from producing high temperature and influencing panel outward appearance.
Preferably, the square hole and the straight line of the outer frame of the square hole are respectively drawn on two sides of the plate so as to be convenient for distinguishing.
According to the method for opening the square holes of the plate, firstly, marks are made on the positions, needing to be opened, of the plate, then, four round holes are drilled on the four corners, needing to be opened, of the plate by the electric hand drill, two crossed straight lines are cut along the diagonal direction by the manual cutting machine, finally, the square holes are cut along the outer rings of the four round holes, and therefore cutting stress is released, and the situation of site cutting damage is avoided. The method can greatly reduce the damage condition of the on-site square holes of various furniture decorative plates, and saves the installation cost for customers. The method has low processing cost and low process difficulty, and has no high requirements on processing technology and processing equipment.
Preferably, after the square hole is obtained, the rough edge of the square hole is repaired by a grinding wheel with 50-100 meshes, and then the edge of the square hole is polished to be smooth by a dry grinding disc with 150-250 meshes. The grinding wheel may be (50, 52, 55, 56, 58, 60, 65, 68, 70, 75, 78, 80, 82, 85, 86, 88, 90, 92, 94, 95, 98 or 100) mesh, for example. The dry grind may be (150, 155, 160, 165, 170, 175, 180, 185, 190, 195, or 200) mesh, for example.
Embodiments of the present application will be described in detail below with reference to specific examples, but it will be understood by those skilled in the art that the following examples are only for illustration of the present application and should not be construed as limiting the scope of the present application. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
Example 1 rock plate square hole
The first step: and drawing accurate perforating positions on the back of the rock plate, and pasting L-shaped iron sheets at four corners to reinforce.
And a second step of: respectively drilling a round hole at four 90-degree corners of the square hole by an electric hand drill and a 15-mm perforating drill bit; the position of the circle center is found firstly, marks are made, and then a drill bit with the diameter of 15mm is arranged on a handle electric drill. Firstly, a round hole mark is lightly formed at the position of the hole, then, the drill bit is drilled in the direction of 60 degrees, the drill bit is prevented from slipping on the surface of a rock plate, and water is added while the hole is formed.
And a third step of: the opposite side round holes are lightly cut into two wire grooves to connect the inner circular arcs by a hand-held cutting machine, so that X-shaped arcs are formed, and attention is paid to not be paid to cutting the outer circular arcs.
Fourth step: a square Kong Waikuang straight line is drawn along the outer circle of the four round holes, a hand-held cutting machine is used for cutting along the drawn straight line, the attention speed is slow, the line is straight, the hand is stable, and water is added while cutting.
Fifth step: and after the hole is formed, polishing the edge of the hole by using an 80-mesh grinding wheel and a 200-mesh dry grinding disc, and forming square holes on the rock plate.
Example 2 tile square hole
The first step: and drawing accurate perforating positions on the back of the ceramic tile, and sticking L-shaped iron sheets at four corners to strengthen the ceramic tile.
And a second step of: respectively drilling a round hole at four 90-degree corners of the square hole by an electric hand drill and a 10mm ceramic tile perforating drill; the position of the circle center is found firstly, marks are made, and then a drill bit with the diameter of 10mm is arranged on a handle electric drill. Firstly, a round hole mark is lightly opened at the position of the hole, then the drill bit is drilled in the direction of 60 degrees, the drill bit is prevented from slipping on the surface of the ceramic tile, and water is added while the hole is opened.
And a third step of: the opposite side round holes are lightly cut into two wire grooves to connect the inner circular arcs by a hand-held cutting machine, so that X-shaped arcs are formed, and attention is paid to not be paid to cutting the outer circular arcs.
Fourth step: a square Kong Waikuang straight line is drawn along the outer circle of the four round holes, a hand-held cutting machine is used for cutting along the drawn straight line, the attention speed is slow, the line is straight, the hand is stable, and water is added while cutting.
Fifth step: and after the hole is formed, polishing the edge of the hole by using a 70-mesh grinding wheel and a 180-mesh dry grinding disc, and forming square holes on the ceramic tile.
Example 3 marble Dan Kaifang well
The first step: and drawing accurate hole opening positions in a marble Dan Zhengmian, and sticking L-shaped iron sheets at four corners to strengthen.
And a second step of: respectively drilling a round hole at four 90-degree corners of the square hole by an electric hand drill and a 20mm open-pore drill bit; the position of the circle center is found firstly, marks are made, and then a drill bit with the diameter of 20mm is arranged on a handle electric drill. Firstly, a round hole mark is lightly opened at the position of the hole, then the drill bit is drilled in the direction of 60 degrees, the drill bit is prevented from slipping on the marble surface, and water is added while the hole is opened.
And a third step of: the opposite side round holes are lightly cut into two wire grooves to connect the inner circular arcs by a hand-held cutting machine, so that X-shaped arcs are formed, and attention is paid to not be paid to cutting the outer circular arcs.
Fourth step: a square Kong Waikuang straight line is drawn along the outer circle of the four round holes, a hand-held cutting machine is used for cutting along the drawn straight line, the attention speed is slow, the line is straight, the hand is stable, and water is added while cutting.
Fifth step: after the hole is formed, the edge of the hole is polished to be smooth by using a 100-mesh grinding wheel and a 230-mesh dry grinding disc, and the marble square hole is formed.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Furthermore, those skilled in the art will appreciate that while some embodiments herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the present application and form different embodiments. For example, in the claims below, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Claims (7)
1. A method of square hole punching of a sheet material, comprising:
drawing the square hole shape at the position of the plate needing to be perforated;
drilling a round hole at the inner corners of the four corners of the square hole shape, wherein each round hole comprises an inner arc facing the center of the square hole shape and an outer arc opposite to the inner arc; the round hole is drilled by using an electric hand drill, and the included angle between a drill bit of the electric hand drill and the plate is 50-70 degrees when the drill bit is drilled; the round hole is opened with water and cooled;
cutting wire grooves in the square hole shape, wherein the wire grooves are respectively connected with the inner arcs of the round holes in opposite angles to form an X shape; the shape of the wire slot is a groove shape formed on the plate, and the wire slot is not cut through to the other surface of the plate;
drawing an outer frame straight line of the square hole along the outer circular arc of the round hole, and cutting along the outer frame straight line to obtain the square hole; the X-shaped wire groove and the outer frame are cut while water is added for cooling.
2. A method of forming square holes in a sheet material according to claim 1, characterized in that metal sheets are applied to the square hole shape at locations other than the inner corners of the four corners for reinforcement.
3. The method of forming square holes in a sheet material according to claim 2, wherein the metal sheet is an L-shaped iron sheet.
4. The method for forming square holes on a plate according to claim 1, wherein the square hole shape and the straight line of the outer frame of the square hole are drawn on both sides of the plate, respectively.
5. The method for forming square holes in a plate according to claim 1, wherein the diameter of the round hole is 10-20 mm.
6. The method for forming square holes on a plate according to claim 1, wherein after the square holes are formed, rough edges of the square holes are repaired by a grinding wheel with 50-100 meshes, and the edges of the square holes are polished to be smooth by a dry grinding plate with 150-250 meshes.
7. The method of square hole forming in a sheet material according to claim 1, wherein the sheet material is selected from any one of rock plate, ceramic tile, marble plate, granite plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210500833.9A CN114770763B (en) | 2022-05-09 | 2022-05-09 | Method for forming square holes in plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210500833.9A CN114770763B (en) | 2022-05-09 | 2022-05-09 | Method for forming square holes in plate |
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| Publication Number | Publication Date |
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| CN114770763A CN114770763A (en) | 2022-07-22 |
| CN114770763B true CN114770763B (en) | 2024-01-19 |
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| CN202210500833.9A Active CN114770763B (en) | 2022-05-09 | 2022-05-09 | Method for forming square holes in plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105307396A (en) * | 2015-09-08 | 2016-02-03 | 东莞生益电子有限公司 | Preparation method for PCB with square hole |
| CN206048520U (en) * | 2016-09-29 | 2017-03-29 | 沈阳远大科技园有限公司 | Hollow composite board tapping machine |
| CN206140715U (en) * | 2016-09-08 | 2017-05-03 | 上海华垒石材有限公司 | Building stones drilling machine |
| CN108650791A (en) * | 2018-04-11 | 2018-10-12 | 大连崇达电路有限公司 | The processing method of square groove or special-shaped groove of the knuckle radius less than 0.30mm in printed wiring board |
| CN108714972A (en) * | 2018-05-18 | 2018-10-30 | 圣都家居装饰有限公司 | Ceramic tile hole opening technology |
| CN216359680U (en) * | 2021-09-16 | 2022-04-22 | 孔庆佗 | Engineering material cutting device for construction |
-
2022
- 2022-05-09 CN CN202210500833.9A patent/CN114770763B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105307396A (en) * | 2015-09-08 | 2016-02-03 | 东莞生益电子有限公司 | Preparation method for PCB with square hole |
| CN206140715U (en) * | 2016-09-08 | 2017-05-03 | 上海华垒石材有限公司 | Building stones drilling machine |
| CN206048520U (en) * | 2016-09-29 | 2017-03-29 | 沈阳远大科技园有限公司 | Hollow composite board tapping machine |
| CN108650791A (en) * | 2018-04-11 | 2018-10-12 | 大连崇达电路有限公司 | The processing method of square groove or special-shaped groove of the knuckle radius less than 0.30mm in printed wiring board |
| CN108714972A (en) * | 2018-05-18 | 2018-10-30 | 圣都家居装饰有限公司 | Ceramic tile hole opening technology |
| CN216359680U (en) * | 2021-09-16 | 2022-04-22 | 孔庆佗 | Engineering material cutting device for construction |
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| Publication number | Publication date |
|---|---|
| CN114770763A (en) | 2022-07-22 |
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