CN116900371A - Double-bond connection taper shank combined drill bit and manufacturing method thereof - Google Patents
Double-bond connection taper shank combined drill bit and manufacturing method thereof Download PDFInfo
- Publication number
- CN116900371A CN116900371A CN202311122822.2A CN202311122822A CN116900371A CN 116900371 A CN116900371 A CN 116900371A CN 202311122822 A CN202311122822 A CN 202311122822A CN 116900371 A CN116900371 A CN 116900371A
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- Prior art keywords
- key
- drill bit
- taper shank
- shank
- groove
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 33
- 238000003754 machining Methods 0.000 claims abstract description 26
- 239000002699 waste material Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000004064 recycling Methods 0.000 claims abstract description 7
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 7
- 239000010962 carbon steel Substances 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 3
- 229910000997 High-speed steel Inorganic materials 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 229910001315 Tool steel Inorganic materials 0.000 description 4
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/0002—Drills with connected cutting heads, e.g. with non-exchangeable cutting heads; Drills with a single insert extending across the rotational axis and having at least two radially extending cutting edges in the working position
- B23B51/0003—Drills with connected cutting heads, e.g. with non-exchangeable cutting heads; Drills with a single insert extending across the rotational axis and having at least two radially extending cutting edges in the working position with exchangeable heads or inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/28—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling Tools (AREA)
Abstract
The invention provides a double-bond connection taper shank combined drill bit and a manufacturing method thereof, belongs to the technical field of machining hole machining tools, and mainly solves the problems of complex process and high time and energy consumption. The drill bit comprises a drill bit part and a taper shank assembly, and is characterized in that: the connecting device comprises a connecting key and a key groove; the key groove comprises a drill bit key groove and a taper shank key groove; the drill head part is in a spiral groove shape, two drill head key grooves are symmetrically formed in the end face of the tail part, and inner screw holes are formed in the bottoms of the drill head key grooves and the taper shank key grooves; the connecting key is arranged in a key groove formed by the key groove of the drill bit part and the key groove of the taper shank, and is fixedly connected with the inner screw hole through a screw. The manufacturing method comprises a waste drill bit recycling method and a new manufacturing method, namely, a drill bit part and a taper shank assembly are manufactured respectively, key grooves are formed, and connecting keys are embedded into the key grooves to form the combined drill bit. The manufacturing process and the heat treatment process of the cutter are greatly simplified.
Description
Technical Field
The invention belongs to the technical field of machining tools for machining holes, and particularly relates to a double-bond connection taper shank combined drill bit and a manufacturing method thereof.
Background
The drill bit for drilling is made of high-speed tool steel, and has cutter body made of high-speed tool steel and handle made of carbon steel, and is made of two materials through blanking, rough machining, butt welding, quenching, annealing and other steps. The process is complex, and the time and energy consumption is high.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a double-bond connection taper shank combined drill bit and a manufacturing method thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the double-bond connection taper shank combined drill bit comprises a drill bit part and a taper shank assembly and is characterized in that: the connecting device comprises a connecting key and a key groove, wherein the key groove comprises a drill bit key groove and a taper shank key groove;
the drill bit is in a spiral groove shape, the end face of the tail of the drill bit is perpendicular to the axis of the drill bit, two drill bit key grooves are symmetrically formed in the back of the spiral groove of the drill bit on the end face of the tail, and inner screw holes of the drill bit are formed in the bottom of the drill bit key grooves;
the taper shank assembly comprises a shank spiral groove cutter part and a taper shank part, one end of the shank spiral groove cutter part is connected with the taper shank part, the end face of the other end of the shank spiral groove cutter part is perpendicular to the axis of the taper shank assembly, a taper shank key slot is formed in the end face of the shank spiral groove cutter part and is positioned at the back of the shank spiral groove cutter, the taper shank key slot is symmetrical with the drill bit key slot, and a taper shank key slot inner screw hole is formed;
the connecting key is in a cuboid shape with four shuttles in the height direction subjected to reverse shuttle treatment, and through holes for penetrating screws for fixing the connecting key are formed in two ends of the connecting key;
one end of the connecting key is arranged in the key slot of the drill bit part, and the other end of the connecting key is arranged in the key slot of the taper shank, and the connecting key is fixedly connected with the screw hole in the drill bit part and the screw hole in the key slot of the taper shank through screws.
The screw is a countersunk screw;
and a counter bore for the countersunk head screw is formed in the outer end of the through hole.
The manufacturing method of the double-bond connection taper shank combined drill bit is characterized in that:
the method comprises a waste drill bit recycling method and a new manufacturing method, wherein the waste drill bit recycling method mainly comprises the following steps:
the first step, classifying, namely classifying the damaged bit part and the intact shank part of the waste bit into one type,
the damage of the intact shank part of the drill bit part in the waste drill bit is classified into one type;
step two, the taper shank assembly is processed, the drill bit part of the waste drill bit with the complete shank selected in the step one is cut off, and a section of shank spiral fluted cutter part is reserved on the shank;
step three, taper shank key grooves are machined, taper shank key grooves are symmetrically machined at the back of the shank spiral groove on the end face of the shank spiral groove cutter part obtained in the step two, and screw holes in the taper shank key grooves are machined in the key grooves;
fourthly, machining key grooves of the drill bit parts, cutting off the handle parts of the waste drill bits with the good drill bit parts selected in the first step, symmetrically machining the key grooves of the drill bit parts at the back of a knife on the cutting surface of the drill bit parts, and machining screw holes in the drill bit parts in the key grooves;
fifthly, manufacturing a connecting key, rounding the four edges of the cuboid in the height direction, and processing a through hole and a counter bore on the connecting key;
sixthly, combining, namely arranging the key slot of the taper shank opposite to the key slot of the drill bit, embedding the connecting key obtained in the fifth step into the key slot, and respectively screwing countersunk screws into the screw holes in the key slot of the taper shank and the screw holes in the drill bit to prepare a combined drill bit;
the new manufacturing method comprises the following steps:
step 1, manufacturing a drill part, machining the drill part by adopting high-speed steel, forming a key groove of the drill part, and forming a screw hole in the drill part at the bottom of the key groove;
step 2, manufacturing a taper shank assembly, machining the taper shank assembly by adopting carbon steel, forming a taper shank key groove, and forming a screw hole in the taper shank key groove at the bottom of the key groove;
step 3, manufacturing a connecting key, wherein the connecting key is processed by adopting carbon steel or alloy steel or stainless steel, and a through hole and a counter bore are formed in a key body;
and 4, combining, namely arranging the key slot of the taper shank opposite to the key slot of the drill bit, embedding the connecting key obtained in the step 3 into the key slot, and respectively screwing countersunk screws into the screw holes in the key slot of the taper shank and the screw holes in the drill bit by penetrating through the through holes of the connecting key to manufacture the combined drill bit.
Compared with the prior art, the invention has the following beneficial effects:
the invention adopts double-bond symmetrical connection, combines the short and small blade, the cutting part and the knife handle, opens an inner screw hole in the key slot by opening the hole on the key body, uses screws to reliably connect the key body and the key slot, improves the utilization rate of tool steel, reduces the processing technology of the drill bit, creates a new tool, can utilize the old drill bit to recycle the old drill bit in practical application, cuts the available handle part, and can be reused after processing the key slot, thereby saving two-thirds of high-speed tool steel materials for the country, and greatly simplifying the manufacturing technology and the heat treatment technology of the tool.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a schematic view of the structure of the drill bit 1 in fig. 1;
FIG. 3 is a schematic view of the taper shank assembly 2 of FIG. 1;
FIG. 4 is a schematic view of the structure of the bond key body of the present invention;
FIG. 5 is a cross-sectional view taken along the plane D-D in FIG. 4;
FIG. 6 is a cross-sectional view taken along the A-A plane of FIG. 1;
FIG. 7 is a cross-sectional view taken along the B-B plane in FIG. 2;
fig. 8 is a cross-sectional view taken along the C-C plane in fig. 3.
In the figure: in the figure: 1-a drill part; 1-a spiral flute back of a drill bit part; 1-1 A-A bit keyway; 1-1b, drilling an inner screw hole of the head part; 2-taper shank assembly; 2-1-shank spiral fluted knife part; 2-1a, taper shank key slot; 2-1b, a screw hole in a key slot of the taper shank; 2-1 c-shank helical flute backs; 2-taper shank; 3-a bond; 3-1-counter bore; 3-2-through holes; 4-screw.
Description of the embodiments
As shown in FIG. 1, the double-bond connection taper shank combined drill bit comprises a drill bit part 1 and a taper shank assembly 2, and is characterized in that: the connecting device comprises a connecting key 3 and a key groove, wherein the key groove comprises a bit key groove 1-1a and a taper shank key groove 2-1a;
as shown in fig. 2, the drill bit 1 is in a spiral groove shape, the end face of the tail of the drill bit is perpendicular to the axis of the drill bit 1, two drill bit keyways 1-1a are symmetrically arranged on the end face of the tail and at the position of the spiral groove back 1-1 of the drill bit, as shown in fig. 7, inner screw holes 1-1b of the drill bit are arranged at the bottom of the drill bit keyways 1-1 a;
as shown in fig. 3, the taper shank assembly 2 includes a shank spiral groove cutter portion 2-1 and a taper shank portion 2-2, wherein one end of the shank spiral groove cutter portion 2-1 is connected with the taper shank portion 2-2, the other end face is perpendicular to the axis of the taper shank assembly 2, a taper shank key groove 2-1a is formed on the end face of the shank spiral groove cutter portion 2-1 and at the position of the shank spiral groove cutter back 2-1c, the taper shank key groove 2-1a is symmetrical with the drill key groove 1-1a, and a taper shank key groove inner screw hole 2-1b is formed;
as shown in fig. 4 and 5, the coupling key 3 is a cuboid with four shuttles in the height direction processed by reverse shuttles, and two ends of the cuboid are provided with through holes 3-2 for passing through screws for fixing the coupling key;
as shown in fig. 1 and 6, one end of the coupling key 3 is disposed in the drill key slot 1-1a, and the other end is disposed in the taper shank key slot 2-1a, and the coupling key 3 is fixedly connected with the drill portion inner screw hole 1-1b and the taper shank key slot inner screw hole 2-1b by a screw 4.
The screw 4 is a countersunk screw;
the outer end of the through hole 3-2 is provided with a counter bore 3-1 for a countersunk head screw.
The manufacturing method of the double-bond connection taper shank combined drill bit is characterized in that:
the method comprises a waste drill bit recycling method and a new manufacturing method, wherein the waste drill bit recycling method mainly comprises the following steps:
the first step, classifying, namely classifying the damaged bit part and the intact shank part of the waste bit into one type,
the damage of the intact shank part of the drill bit part in the waste drill bit is classified into one type;
step two, the taper shank assembly 2 is processed, the drill bit part of the waste drill bit with the complete shank selected in the step one is cut off, and a section of shank spiral fluted cutter part 2-1 is reserved on the shank;
thirdly, machining taper shank key grooves 2-1a, symmetrically machining taper shank key grooves 2-1a at the positions of shank spiral groove back 2-1c on the end face of the shank spiral groove cutter part 2-1 obtained in the second step, and machining screw holes 2-1b in the taper shank key grooves in the key grooves;
fourthly, machining the key groove 1-1a of the drill bit part, cutting off the handle part of the waste drill bit with the good drill bit part selected in the first step, symmetrically machining the key groove 1-1a of the drill bit part at the back of a knife on the cutting surface of the drill bit part, and machining the screw hole 1-1b in the drill bit part in the key groove;
fifthly, manufacturing a connecting key 3, rounding the four edges of the cuboid in the height direction, and processing a through hole 3-2 and a counter bore 3-1 on the connecting key;
sixthly, combining, namely arranging the taper shank key slot 2-1a opposite to the drill bit key slot 1-1a, embedding the connecting key 3 obtained in the fifth step into the key slot, and respectively screwing countersunk screws into the taper shank key slot inner screw hole 2-1b and the drill bit inner screw hole 1-1b through the connecting key through holes 3-2 to prepare a combined drill bit;
the new manufacturing method comprises the following steps:
step 1, manufacturing a drill part 1, machining the drill part 1 by adopting high-speed steel, forming a drill part key groove 1-1a, and forming a drill part inner screw hole 1-1b at the bottom of the key groove;
step 2, manufacturing a taper shank assembly 2, machining the taper shank assembly 2 by adopting carbon steel, forming a taper shank key groove 2-1a, and forming a taper shank key groove inner screw hole 2-1b at the bottom of the key groove;
step 3, manufacturing a connecting key 3, wherein the connecting key is processed by adopting carbon steel or alloy steel or stainless steel, and a through hole 3-2 and a counter bore 3-1 are formed in a key body;
and 4, combining, namely arranging the taper shank key slot 2-1a opposite to the drill bit key slot 1-1a, embedding the connecting key 3 obtained in the step 3 into the key slot, and respectively screwing countersunk screws into the screw holes 2-1b and 1-1b in the taper shank key slot through the through holes 3-2 of the connecting key to manufacture the combined drill bit.
Claims (4)
1. The double-bond connection taper shank combined drill bit comprises a drill bit part (1) and a taper shank assembly (2), and is characterized in that: the connecting device comprises a connecting key (3) and a key slot, wherein the key slot comprises a bit key slot (1-1 a) and a taper shank key slot (2-1 a);
the drill bit part (1) is spiral groove-shaped, the end face of the tail part of the drill bit is perpendicular to the axis of the drill bit part (1), two drill bit part key grooves (1-1 a) are symmetrically formed in the position, located at the back (1-1) of the spiral groove of the drill bit part, of the tail end face of the drill bit, and drill bit part inner screw holes (1-1 b) are formed in the bottoms of the drill bit part key grooves (1-1 a);
the taper shank assembly (2) comprises a shank spiral groove cutter part (2-1) and a taper shank part (2-2), one end of the shank spiral groove cutter part (2-1) is connected with the taper shank part (2-2), the end face of the other end of the shank spiral groove cutter part is perpendicular to the axis of the taper shank assembly (2), the end face of the shank spiral groove cutter part (2-1) is positioned at the shank spiral groove back (2-1 c), taper shank key grooves (2-1 a) are formed, the taper shank key grooves (2-1 a) are symmetrical with the drill bit key grooves (1-1 a), and taper shank key groove inner screw holes (2-1 b) are formed;
the connecting key (3) is in the shape of a cuboid with four shuttles in the height direction subjected to reverse shuttle treatment, and through holes (3-2) for penetrating screws for fixing the connecting key are formed in two ends of the connecting key;
one end of the connecting key (3) is arranged in the key groove (1-1 a) of the drill bit part, the other end of the connecting key is arranged in the key groove (2-1 a) of the taper shank, and the connecting key (3) is fixedly connected with the screw hole (1-1 b) in the drill bit part and the screw hole (2-1 b) in the key groove of the taper shank through the screw (4).
2. The double bond-coupled countersunk head, according to claim 1, wherein: the screw (4) is a countersunk screw.
3. The double bond-coupled countersunk head, according to claim 1, wherein: the outer end of the through hole (3-2) is provided with a counter bore (3-1) for a countersunk head screw.
4. The manufacturing method of the double-bond connection taper shank combined drill bit comprises the double-bond connection taper shank combined drill bit disclosed in claim 1, and is characterized in that:
the method comprises a waste drill bit recycling method and a new manufacturing method, wherein the waste drill bit recycling method mainly comprises the following steps:
the first step, classifying, namely classifying the damaged bit part and the intact shank part of the waste bit into one type,
the damage of the intact shank part of the drill bit part in the waste drill bit is classified into one type;
step two, the taper shank assembly (2) is processed, the drill bit part of the waste drill bit with the complete shank selected in the step one is cut off, and a section of shank spiral fluted cutter part (2-1) is reserved on the shank;
thirdly, machining taper shank key grooves (2-1 a), symmetrically machining taper shank key grooves (2-1 a) at the positions of shank spiral groove backs (2-1 c) on the end faces of shank spiral groove knife parts (2-1) obtained in the second step, and machining screw holes (2-1 b) in the taper shank key grooves in the key grooves;
fourthly, machining a key groove (1-1 a) of the drill bit part, cutting off the handle part of the waste drill bit with the good drill bit part selected in the first step, symmetrically machining the key groove (1-1 a) of the drill bit part at the back of a knife on the cutting surface of the drill bit part, and machining a screw hole (1-1 b) in the drill bit part in the key groove;
fifthly, manufacturing a connecting key (3), rounding the four edges of the cuboid in the height direction, and processing a through hole (3-2) and a counter bore (3-1) on the connecting key;
sixthly, combining, namely arranging a taper shank key slot (2-1 a) opposite to a drill bit key slot (1-1 a), embedding the connecting key (3) obtained in the fifth step into the key slot, and respectively screwing into a taper shank key slot inner screw hole (2-1 b) and a drill bit inner screw hole (1-1 b) by using countersunk screws through the through holes (3-2) of the connecting key to manufacture a combined drill bit;
the new manufacturing method comprises the following steps:
step 1, manufacturing a drill part (1), machining the drill part (1) by adopting high-speed steel, forming a drill part key groove (1-1 a), and forming a drill part inner screw hole (1-1 b) at the bottom of the key groove;
step 2, manufacturing a taper shank assembly (2), machining the taper shank assembly (2) by adopting carbon steel, forming a taper shank key groove (2-1 a), and forming a taper shank key groove inner screw hole (2-1 b) at the bottom of the key groove;
step 3, manufacturing a connecting key (3), wherein the connecting key is processed by adopting carbon steel or alloy steel or stainless steel, and a through hole (3-2) and a counter bore (3-1) are formed in a key body;
and 4, combining, namely arranging the taper shank key slot (2-1 a) opposite to the drill bit key slot (1-1 a), embedding the connecting key (3) obtained in the step 3 into the key slot, and respectively screwing the countersunk head screw into the screw hole (2-1 b) in the taper shank key slot and the screw hole (1-1 b) in the drill bit part by penetrating the through hole (3-2) of the connecting key.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311122822.2A CN116900371A (en) | 2023-09-01 | 2023-09-01 | Double-bond connection taper shank combined drill bit and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311122822.2A CN116900371A (en) | 2023-09-01 | 2023-09-01 | Double-bond connection taper shank combined drill bit and manufacturing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116900371A true CN116900371A (en) | 2023-10-20 |
Family
ID=88361295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311122822.2A Withdrawn CN116900371A (en) | 2023-09-01 | 2023-09-01 | Double-bond connection taper shank combined drill bit and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116900371A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1461548A (en) * | 1921-05-05 | 1923-07-10 | Claude A West | Metal-working tool |
| DE10054850A1 (en) * | 2000-11-04 | 2002-05-08 | Hilti Ag | Drill bit for rock has annular hollow drilling crown with axial connection surface at least partly against endface of spiral shaft |
| US20030219321A1 (en) * | 2000-09-01 | 2003-11-27 | Bernhard Borschert | Twist drill with a replaceable cutting insert and a rotary cutting tool with a replaceable cutting insert |
| KR100688129B1 (en) * | 2006-03-27 | 2007-03-02 | 윤성덕 | A drill with alternative end parts |
| CN201755678U (en) * | 2010-07-27 | 2011-03-09 | 哈尔滨汽轮机厂有限责任公司 | Reamer with replaceable tool bit |
| CN203756065U (en) * | 2014-01-24 | 2014-08-06 | 天津探矿机械有限公司 | Key embedded connecting structure for drilling equipment power head spindle |
| RU163809U1 (en) * | 2016-02-19 | 2016-08-10 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Московский государственный технологический университет "СТАНКИН" (ФГБОУ ВО "МГТУ "СТАНКИН") | BORING TOOL |
-
2023
- 2023-09-01 CN CN202311122822.2A patent/CN116900371A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1461548A (en) * | 1921-05-05 | 1923-07-10 | Claude A West | Metal-working tool |
| US20030219321A1 (en) * | 2000-09-01 | 2003-11-27 | Bernhard Borschert | Twist drill with a replaceable cutting insert and a rotary cutting tool with a replaceable cutting insert |
| DE10054850A1 (en) * | 2000-11-04 | 2002-05-08 | Hilti Ag | Drill bit for rock has annular hollow drilling crown with axial connection surface at least partly against endface of spiral shaft |
| KR100688129B1 (en) * | 2006-03-27 | 2007-03-02 | 윤성덕 | A drill with alternative end parts |
| CN201755678U (en) * | 2010-07-27 | 2011-03-09 | 哈尔滨汽轮机厂有限责任公司 | Reamer with replaceable tool bit |
| CN203756065U (en) * | 2014-01-24 | 2014-08-06 | 天津探矿机械有限公司 | Key embedded connecting structure for drilling equipment power head spindle |
| RU163809U1 (en) * | 2016-02-19 | 2016-08-10 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Московский государственный технологический университет "СТАНКИН" (ФГБОУ ВО "МГТУ "СТАНКИН") | BORING TOOL |
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20231020 |
|
| WW01 | Invention patent application withdrawn after publication |