CN209838412U - Shield cutter body - Google Patents
Shield cutter body Download PDFInfo
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- CN209838412U CN209838412U CN201821930372.4U CN201821930372U CN209838412U CN 209838412 U CN209838412 U CN 209838412U CN 201821930372 U CN201821930372 U CN 201821930372U CN 209838412 U CN209838412 U CN 209838412U
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- soldering lug
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Abstract
A shield cutter body comprises a hard alloy cutter head, a first soldering lug, a stainless steel screen, a second soldering lug and a stainless steel substrate, wherein the hard alloy cutter head, the first soldering lug, the stainless steel screen, the second soldering lug and the stainless steel substrate are sequentially attached and welded from front to back; the first soldering lug and the second soldering lug are made of the same material; the welding surface of the hard alloy cutter head is a right-angle surface formed by combining two adjacent surfaces, the formed welding surface is a vertical welding surface, and the corner of the two adjacent surfaces is a round angle; the first soldering lug, the stainless steel screen and the second soldering lug are all right-angle surface structural bodies, and corners are set to be fillets; the shapes of the three parts are matched with the right-angle surface of the hard alloy cutter head, so that the three parts are convenient to fit and weld; the front end of the stainless steel substrate is concavely provided with a combining part, the surface of the combining part is a right-angle surface, and a corner is set as a fillet; the shape of joint portion matches with the right angle face of carbide tool bit, the laminating welding of being convenient for. The utility model relates to a novelty, firm in connection has strengthened the welded success rate, and the stainless steel screen cloth can play the effect of resisting impact and oscillation in the braze joint use.
Description
Technical Field
The utility model relates to a shield constructs operation instrument technical field, concretely relates to shield constructs sword cutter body.
Background
The shield cutter is mainly used for tunneling rock tunnels, mainly plays a role in cutting rocks to be pushed forwards in a front-section cutting system, and the service life of the shield cutter mainly depends on the firmness degree of welding and fixing the hard alloy cutter head and the steel matrix. The welding of traditional shield cutter usually uses single silver soldering lug or copper soldering lug, adopts whole heating method welding to weld each part, and the problem that this traditional welding mode exists includes:
firstly, the welding surface of the shield cutter is generally a vertical surface, and a single silver soldering lug or copper soldering lug is easy to lose solder under the action of gravity in the welding process, so that the longitudinal surface is not welded firmly;
secondly, because the welding stress of the steel base body and the hard alloy cutter head is larger in the welding process, cracks are easily generated in the welding of a single silver welding sheet or a single copper welding sheet, and the larger the combination area is, the larger the cracks are;
thirdly, because of adopting the integral heating method and the larger size of the shield cutter body, the heating efficiency is too low.
Therefore, how to solve the above-mentioned deficiencies of the prior art is a problem to be solved by the present invention.
Disclosure of Invention
The utility model aims at providing a shield constructs sword cutter body.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
a shield cutter body comprises a hard alloy cutter head, a first soldering lug, a stainless steel screen, a second soldering lug and a stainless steel substrate, wherein the hard alloy cutter head, the first soldering lug, the stainless steel screen, the second soldering lug and the stainless steel substrate are sequentially attached and welded from front to back; the first soldering lug and the second soldering lug are made of the same material;
the welding surface of the hard alloy cutter head is a right-angle surface formed by combining two adjacent surfaces, the welding surface is a vertical welding surface, and the corner of the two adjacent surfaces is a round angle;
the first soldering lug, the stainless steel screen and the second soldering lug are all right-angle surface structural bodies, and corners are set to be fillets; the shapes of the three parts are matched with the right-angle surface of the hard alloy cutter head, so that the three parts are convenient to fit and weld;
the front end of the stainless steel substrate is concavely provided with a combining part, the surface of the combining part is a right-angle surface, and a corner is provided with a fillet; the shape of the joint part is matched with the right-angle surface of the hard alloy cutter head, so that the joint part is convenient to attach and weld.
The relevant content in the above technical solution is explained as follows:
1. in the above scheme, the first soldering lug and the second soldering lug are both copper soldering lugs.
2. In the above scheme, the first soldering lug and the second soldering lug are both silver soldering lugs.
3. In the scheme, the verticality of the vertical welding surface of the hard alloy cutter head and the stainless steel substrate is less than or equal to 0.05mm, and the verticality is used for better fitting the hard alloy cutter head.
4. In the above scheme, the lengths of the circular arcs (R) of the fillets in the vertical welding surfaces of the cemented carbide tip and the stainless steel base body are 1/15 ~ 1/10 of the length of the vertical welding surface, and the circular arcs (R) can reduce stress concentration caused by sharp points.
5. In the scheme, the first soldering lug and the second soldering lug are made of the same material, namely the same components, so that the welding performance is improved, and the phenomenon that welding brazing filler metal runs off to cause unevenness is avoided.
The utility model discloses a theory of operation and advantage as follows:
the utility model relates to a shield cutter body, which comprises a hard alloy cutter head, a first soldering lug, a stainless steel screen, a second soldering lug and a stainless steel substrate, wherein the hard alloy cutter head, the first soldering lug, the stainless steel screen, the second soldering lug and the stainless steel substrate are sequentially attached and welded from front to back; the first soldering lug and the second soldering lug are made of the same material; the welding surface of the hard alloy cutter head is a right-angle surface formed by combining two adjacent surfaces, the formed welding surface is a vertical welding surface, and the corner of the two adjacent surfaces is a round angle; the first soldering lug, the stainless steel screen and the second soldering lug are all right-angle surface structural bodies, and corners are set to be fillets; the shapes of the three parts are matched with the right-angle surface of the hard alloy cutter head, so that the three parts are convenient to fit and weld; the front end of the stainless steel substrate is concavely provided with a combining part, the surface of the combining part is a right-angle surface, and a corner is set as a fillet; the shape of joint portion matches with the right angle face of carbide tool bit, the laminating welding of being convenient for.
The utility model relates to a novelty, firm in connection has strengthened the welded success rate, and the stainless steel screen cloth can play the effect of resisting impact and oscillation in the braze joint use, has improved the structural strength of shield structure sword cutter body, and is difficult for being destroyed.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a left side view of FIG. 1;
FIG. 3 is a top view of FIG. 1;
fig. 4 is an exploded perspective view of an embodiment of the present invention.
In the above drawings: 1. a cemented carbide tip; 2. a first bonding pad; 3. a stainless steel screen; 4. a second bonding pad; 5. a stainless steel substrate; 6. a vertical welding surface of the cemented carbide tool bit; 7. a vertical welding surface of the stainless steel substrate; 8. a bonding section; r. circular arc.
Detailed Description
The invention will be further described with reference to the following drawings and examples:
in the embodiment, referring to fig. 1 ~ 4, the shield cutter body comprises a hard alloy cutter head 1, a first soldering lug 2, a stainless steel screen 3, a second soldering lug 4 and a stainless steel substrate 5 which are sequentially attached from front to back and are welded, and the first soldering lug 2 and the second soldering lug 4 are made of the same material.
The welding surface of the hard alloy cutter head 1 is a right-angle surface formed by combining two adjacent surfaces, the welding surface is a vertical welding surface 6, and the corner of the two adjacent surfaces is a round angle;
the first soldering lug 2, the stainless steel screen 3 and the second soldering lug 4 are all right-angled surface structures, and the corners are provided with the fillets; the shapes of the three parts are matched with a right-angle surface (namely a vertical welding surface 6) of the hard alloy cutter head 1, so that the three parts are convenient to fit and weld;
the front end of the stainless steel substrate 5 is concavely provided with a combining part 8, the surface of the combining part 8 is a right-angle surface, the right-angle surface is a vertical welding surface 7, and the corner is provided with the fillet; the shape of the joint part 8 is matched with the right-angle surface of the hard alloy cutter head 1, so that the joint part is convenient to attach and weld.
The first soldering lug 2 and the second soldering lug 4 are both copper soldering lugs or both silver soldering lugs. The two soldering lugs 2 and 4 are made of the same material, namely the same components, so that the welding performance can be improved, and the phenomenon that welding solder runs off to cause unevenness is avoided.
The verticality of the vertical welding surfaces 6 and 7 of the hard alloy tool bit 1 and the stainless steel substrate 5 is less than or equal to 0.05mm, and the verticality is used for better fitting the hard alloy tool bit.
The welding process comprises the following steps:
step one, processing the stainless steel substrate 5
Processing a right-angle surface on the combining part 8 of the stainless steel substrate 5, wherein the right-angle surface is a vertical welding surface 7, and the verticality is less than or equal to 0.05 mm; meanwhile, the arc R is processed at the root of the vertical welding surface 7, so that stress concentration caused by sharp points can be reduced;
1/15 ~ 1/10, the length of the arc R is equal to the length of the vertical welding surface 7;
step two, processing the hard alloy cutter block 1
Processing the welding surface of the hard alloy cutter block 1 into a right-angle surface, wherein the right-angle surface is a vertical welding surface 6, and the verticality is less than or equal to 0.05 mm; simultaneously, processing an arc R at the root of the vertical welding surface 6;
the cobalt content of the cemented carbide insert 1 was 10 ~ 16% (weight percent);
step three, forming soldering lugs 2 and 4
The first soldering lug 2 and the second soldering lug 4 are molded through a mold, and the molded first soldering lug 2 and the molded second soldering lug 4 are matched with the shape of the vertical welding surface 7 of the stainless steel base body 5;
step four, sand blasting treatment
Carrying out sand blasting treatment on the vertical welding surfaces 7 and 6 of the stainless steel substrate 5 and the hard alloy tool bit 1 respectively, and cleaning with alcohol after the sand blasting is finished; the mesh number of the sand is more than 30 meshes;
the function of sand blasting is to remove stains affecting welding, and the requirement of sand blasting can be met by more than 30 meshes: the total area of slight discoloration caused by residual rust, oil stain, scale, and other stains is at any 25X25mm2Is not allowed to exceed 3%;
step five, loading materials before welding
The stainless steel substrate 5 is laid flat, so that one of the vertical welding surfaces 7 of the combination part 8 is in a horizontal state, and flux loss is avoided during filling before welding; then, sequentially placing the second soldering lug 2, the stainless steel screen 3, the first soldering lug 4 and the hard alloy cutter head 1, and smearing soldering flux on each layer;
the mesh number of the stainless steel screen 3 is 60 ~ 100 meshes, the thickness of the stainless steel screen is 0.15 ~ 0.3mm, the tensile strength is greater than 485Mpa, and the yield strength is greater than or equal to 170 Mpa;
step six, medium frequency induction brazing
Putting the stainless steel substrate 5 into an intermediate frequency heater (not shown in the figure), wherein two vertical surfaces of a vertical welding surface 7 form an angle of 45 degrees with a horizontal plane, and a heating area of the intermediate frequency heater completely covers the vertical welding surface 7;
wherein the frequency of the intermediate frequency heater is 500Hz ~ 20 KHz;
the principle of the medium-frequency heater is that medium-frequency alternating current flows in a medium-frequency inductor, high-density magnetic lines are generated in the medium-frequency inductor, and the magnetic lines act on a metal material to generate large induced current in the metal material, so that the vertical welding surface 7 of the stainless steel substrate 5 is rapidly heated;
step seven, starting the intermediate frequency heater
The running time of the intermediate frequency heater is 6 ~ 8min, and the heating speed of the stainless steel substrate 5 is less than or equal to 10 ℃/s;
when the temperature reaches a target temperature, adopting flame to assist welding to melt the first soldering lug 2 and the second soldering lug 4; (flame welding without taking out of the intermediate frequency heater)
After the welding lugs 2 and 4 are melted, edge repair welding is carried out by using welding rods with the same components as the welding lugs 2 and 4, and the welding rods are made of the same material as the two welding lugs 2 and 4; after the welding rod is melted into solder, a tool (such as a copper bar) is used for shifting the hard alloy cutter head 1, so that the hard alloy cutter head 1 is positioned in the middle of the joint part of the stainless steel substrate 5; the edge of the joint of the hard alloy tool bit 1 and the stainless steel substrate 5 is fully filled with at least one circle of solder;
wherein, the flux is added once every 1 minute in the whole welding process for anti-oxidation protection; the whole welding process refers to the whole process of medium-frequency heating, flame-assisted welding and edge repair welding;
the flame used by the edge repair welding is mixed combustion flame of acetylene and oxygen, the volume ratio of the acetylene to the oxygen is less than or equal to 2:5, the edge repair welding time is 1.5 ~ 2min, and the two welding sheets 2 and 4 and the welding rod are completely melted;
step eight, heat preservation after welding
And after the edge repair welding is finished, carrying out artificial aging treatment on the shield cutter body for more than or equal to 8 hours so as to remove the stress at the welding joint.
The first soldering lug 2 and the second soldering lug 4 are both copper soldering lugs and are made of the following components in parts by weight:
45 parts of copper and 45 ~ 65 parts of copper;
30 parts of zinc, 30 ~ 45 parts;
2, 2 ~ 7 parts of manganese;
1 ~ 7 parts of tin;
1, 1 ~ 7 parts of nickel;
when selecting a copper pad, in step seven, the target temperature is 800 ~ 850 ℃.
Or, the first soldering lug 2 and the second soldering lug 4 are silver soldering lugs, and the materials of the silver soldering lugs comprise the following components in parts by weight:
15 parts of silver, 15 ~ 50 parts;
20 parts of copper 20 ~ 45;
15 parts of zinc, 15 ~ 35 parts;
when silver solder pads are selected, in step seven, the target temperature is 600 ~ 650 ℃ at 650 ℃.
The artificial aging is to insert the shield cutter body into dense perlite powder (or other heat insulation materials with the same effect) for heat insulation, wherein the heat insulation time is more than or equal to 8 h.
Wherein, the brazing flux is selected to be corresponding to the soldering lugs 2 and 4, such as copper brazing flux for copper soldering lugs and silver brazing flux for silver soldering lugs, and the brazing flux is used for eliminating oxides generated in the high-temperature process.
The utility model discloses adopt intermediate frequency heater to carry out local heating earlier, adopt flame to help welding after the temperature reaches target temperature, two-layer soldering lug 2, 4 add and hold one deck stainless steel screen cloth 3, and first soldering lug 2 links to each other through capillary action with one side of carbide tool bit 1, stainless steel screen cloth 3, and second soldering lug 4 links to each other through capillary action with stainless steel matrix 5, stainless steel screen cloth 3's opposite side. The first soldering lug 2, the stainless steel screen mesh 3 and the second soldering lug 4 are tightly combined together during welding to form a soldering joint.
Compared with the prior art, the utility model adopts the local heating and flame welding-aid method, the efficiency is improved by more than four times compared with the integral heating method, and the operation is simple and the cost is low; by adopting the stainless steel screen interlayer method for welding, the stainless steel screen can effectively slow down the loss of the welding flux on the longitudinal surface in the welding process, so that the welding is firmer; meanwhile, the stainless steel screen interlayer can effectively relieve cracks caused by stress concentration of the hard alloy cutter head and the stainless steel substrate.
To sum up, the utility model relates to a novelty, firm in connection has strengthened the welded success rate, and the stainless steel screen cloth can play the effect of resisting impact and oscillation in the braze joint use, has improved the structural strength of shield structure sword cutter body, and long-term work is also difficult destruction.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (5)
1. The utility model provides a shield constructs sword cutter body which characterized in that:
the stainless steel screen comprises a hard alloy tool bit, a first soldering lug, a stainless steel screen, a second soldering lug and a stainless steel substrate which are sequentially attached and welded from front to back; the first soldering lug and the second soldering lug are made of the same material;
the welding surface of the hard alloy cutter head is a right-angle surface formed by combining two adjacent surfaces, the welding surface is a vertical welding surface, and the corner of the two adjacent surfaces is a round angle;
the first soldering lug, the stainless steel screen and the second soldering lug are all right-angle surface structural bodies, and corners are set to be fillets; the shapes of the three parts are matched with the right-angle surface of the hard alloy cutter head, so that the three parts are convenient to fit and weld;
the front end of the stainless steel substrate is concavely provided with a combining part, the surface of the combining part is a right-angle surface, and a corner is provided with a fillet; the shape of the joint part is matched with the right-angle surface of the hard alloy cutter head, so that the joint part is convenient to attach and weld.
2. The cutter body of claim 1, wherein: the first soldering lug and the second soldering lug are both copper soldering lugs.
3. The cutter body of claim 1, wherein: the first soldering lug and the second soldering lug are both silver soldering lugs.
4. The cutter body of claim 1, wherein: the verticality of the vertical welding surfaces of the hard alloy tool bit and the stainless steel substrate is less than or equal to 0.05 mm.
5. The tool body of claim 1, wherein the arc lengths of the fillets in the vertical welding surfaces of the cemented carbide insert and the stainless steel substrate account for 1/15 ~ 1/10 of the length of the vertical welding surfaces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821930372.4U CN209838412U (en) | 2018-11-22 | 2018-11-22 | Shield cutter body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821930372.4U CN209838412U (en) | 2018-11-22 | 2018-11-22 | Shield cutter body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209838412U true CN209838412U (en) | 2019-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821930372.4U Active CN209838412U (en) | 2018-11-22 | 2018-11-22 | Shield cutter body |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109356601A (en) * | 2018-11-22 | 2019-02-19 | 武汉新锐合金工具有限公司 | A kind of shield knife cutter hub and its welding procedure |
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2018
- 2018-11-22 CN CN201821930372.4U patent/CN209838412U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109356601A (en) * | 2018-11-22 | 2019-02-19 | 武汉新锐合金工具有限公司 | A kind of shield knife cutter hub and its welding procedure |
| CN109356601B (en) * | 2018-11-22 | 2024-07-05 | 武汉新锐合金工具有限公司 | Shield cutter body and welding process thereof |
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