Hard rock hob cutter ring and hob

Abstract

The utility model provides a hob cutter ring for hard rock and a hob, and belongs to the field of tunneling equipment. The hob cutter ring for the hard rock comprises a cutter ring base body, mounting holes are formed in the periphery of the cutter ring base body, wear-resistant teeth are arranged in the mounting holes, each wear-resistant tooth comprises a wear-resistant body and an anti-impact inner core embedded in the wear-resistant body, and the hardness of the anti-impact inner core is smaller than that of the wear-resistant body. The hob comprises a hob body and the hob ring for the hard rock. According to the hob cutter ring for the hard rock, the impact-resistant inner cores are additionally arranged in the wear-resistant teeth, so that the impact toughness of the wear-resistant teeth is enhanced, and the service life of the hob cutter ring for the hard rock is prolonged.

Description

Technical Field

[0001] The utility model belongs to the field of tunnel excavation equipment, in particular to a roller cutter ring for hard rock. Background Art

[0002] As a consumable part of the cutterhead of a tunnel boring machine that directly penetrates into the rock formation and breaks the rock, the cutter needs to have good wear resistance. When tunneling in hard rock formations, the poor wear resistance of the cutter will result in frequent replacement of the cutter, resulting in increased construction costs and affecting the construction progress.

[0003] In order to solve the above technical problems, the existing Chinese utility model patent with authorization announcement number CN216518005U and authorization announcement date May 13, 2022 discloses a hob cutter ring inlaid with cutter teeth, which includes a cutter ring base and an alloy hole arranged on the cutter ring base, and alloy teeth are arranged in the alloy hole, and the alloy teeth are welded and fixed to the cutter ring base, and a nickel-based wear-resistant layer is also clad on both sides of the cutter ring base. In the process of rock breaking by the hob cutter, the alloy teeth first contact with the rock. Since the alloy teeth have the characteristics of high hardness and good wear resistance, they can protect the cutter ring base from wear and tear, thereby increasing the service life of the cutter ring base.

[0004] Generally speaking, the higher the hardness of the alloy teeth, the stronger their wear resistance will be, and at the same time their impact toughness will be reduced. Therefore, alloy teeth with strong wear resistance are very likely to break when subjected to impact, resulting in a reduction in the service life of the hob cutter ring. Utility Model Content

[0005] One of the purposes of the utility model is to provide a hob cutter ring for hard rock, so as to solve the technical problem in the prior art that the alloy teeth with strong wear resistance on the hob cutter ring are very easy to break when subjected to impact, resulting in a short service life of the hob cutter ring.

[0006] Another object of the utility model is to provide a hob to solve the above technical problems.

[0007] In order to achieve the above-mentioned purpose, the technical solution of the hard rock hob cutter ring provided by the utility model is:

[0008] A hob cutter ring for hard rock comprises a cutter ring base body, a mounting hole is arranged on the outer periphery of the cutter ring base body, wear-resistant teeth are arranged in the mounting hole, the wear-resistant teeth comprise a wear-resistant body and an impact-resistant inner core embedded in the wear-resistant body, and the hardness of the impact-resistant inner core is less than the hardness of the wear-resistant body.

[0009] As a further improvement, the wear-resistant body includes a root portion fixed in the mounting hole and a head portion exposed outside the cutter ring base, and the impact-resistant inner core is located at the root portion of the wear-resistant body.

[0010] As a further improvement, the height of the impact-resistant inner core is greater than or equal to two-thirds of the height of the root.

[0011] As a further improvement, the height of the impact-resistant inner core is greater than or equal to half of the height of the wear-resistant body.

[0012] As a further improvement, the impact-resistant inner core is a structural steel inner core.

[0013] As a further improvement, the wear-resistant body is a cemented carbide body.

[0014] As a further improvement, the wear-resistant teeth are connected to the cutter ring base by brazing.

[0015] As a further improvement, mounting ring grooves are arranged on both axial end surfaces of the cutter ring base, and wear-resistant ring sheets are arranged in the mounting ring grooves.

[0016] As a further improvement, the wear-resistant ring sheet and the cutter ring base are connected by brazing.

[0017] The beneficial effect is that the hard rock cutter ring provided by the utility model is an improvement on the prior art. The hard rock cutter ring adds an impact-resistant inner core to the wear-resistant teeth installed on its periphery, thereby ensuring sufficient wear resistance of the wear-resistant teeth and enhancing its impact toughness, so that the cutter ring will not break when impacted, thereby increasing the service life of the hard rock cutter ring.

[0018] In order to achieve the above-mentioned purpose, the technical solution of the hob provided by the utility model is:

[0019] A roller cutter comprises a cutter body and a cutter ring. The cutter ring comprises a cutter ring base. A mounting hole is arranged on the outer periphery of the cutter ring base. Wear-resistant teeth are arranged in the mounting hole. The wear-resistant teeth comprise a wear-resistant body and an impact-resistant inner core embedded in the wear-resistant body. The hardness of the impact-resistant inner core is less than that of the wear-resistant body.

[0020] As a further improvement, the wear-resistant body includes a root portion fixed in the mounting hole and a head portion exposed outside the cutter ring base, and the impact-resistant inner core is located at the root portion of the wear-resistant body.

[0021] As a further improvement, the height of the impact-resistant inner core is greater than or equal to two-thirds of the height of the root.

[0022] As a further improvement, the height of the impact-resistant inner core is greater than or equal to half of the height of the wear-resistant body.

[0023] As a further improvement, the impact-resistant inner core is a structural steel inner core.

[0024] As a further improvement, the wear-resistant body is a cemented carbide body.

[0025] As a further improvement, the wear-resistant teeth are connected to the cutter ring base by brazing.

[0026] As a further improvement, mounting ring grooves are arranged on both axial end surfaces of the cutter ring base, and wear-resistant ring sheets are arranged in the mounting ring grooves.

[0027] As a further improvement, the wear-resistant ring sheet and the cutter ring base are connected by brazing.

[0028] The beneficial effect is that the hob provided by the utility model is an improvement on the prior art. The hob adds an impact-resistant inner core in the wear-resistant teeth, thereby ensuring sufficient wear resistance of the wear-resistant teeth and enhancing their impact toughness, so that they will not break when impacted, thereby increasing the service life of the hob ring for hard rock. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic structural diagram of a hard rock hob cutter ring in one embodiment of the utility model;

[0030] Figure 2 It is a structural schematic diagram of a cutter ring for hard rock in one embodiment of the utility model from another perspective;

[0031] Figure 3 It is a cross-sectional view of a hob cutter ring for hard rock in one embodiment of the utility model.

[0032] Description of reference numerals:

[0033] 1. Knife ring base; 2. Mounting hole; 3. Wear-resistant teeth; 31. Wear-resistant body; 32. Impact-resistant inner core; 4. Mounting ring groove; 5. Wear-resistant ring piece. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with the embodiments.

[0035] In order to solve the problems in the prior art, the main idea of ​​the utility model is to increase the impact-resistant toughness of the wear-resistant teeth by adding an impact-resistant inner core to the wear-resistant teeth, thereby increasing the service life of the hard rock hob.

[0036] The specific embodiment of the hard rock hob cutter ring provided by the utility model is as follows:

[0037] A hob cutter ring for hard rock, see attached Figure 1 , Attachment Figure 2 And attached Figure 3 , including an annular cutter ring base 1, the outer circumference of the cutter ring base 1 is uniformly provided with mounting holes 2 along its circumference, and the mounting holes 2 are blind holes. A wear-resistant tooth 3 is arranged in each mounting hole 2, the root of the wear-resistant tooth 3 is embedded in the mounting hole 2, and the head of the wear-resistant tooth 3 extends out of the mounting hole 2. The wear-resistant tooth 3 is fixedly connected to the cutter ring base 1 by brazing to obtain better connection strength.

[0038] The wear-resistant tooth 3 includes a wear-resistant body 31 and an impact-resistant inner core 32 embedded in the wear-resistant body 31. The wear-resistant body 31 is a hard alloy body, and the impact-resistant inner core 32 is a structural steel inner core. The wear-resistant body 31 can ensure the wear resistance of the wear-resistant tooth 3, while the impact-resistant inner core 32 can improve the impact resistance of the wear-resistant tooth 3, prevent the wear-resistant tooth 3 from being broken when impacted, and effectively improve the service life of the hob cutter ring.

[0039] The wear-resistant body 31 includes a root fixed in the mounting hole 2 and a head exposed outside the knife ring base 1. The impact-resistant inner core 32 is located at the root of the wear-resistant body 31, and one end face of the impact-resistant inner core 32 is aligned with the end face of the root of the wear-resistant body 31. In order to ensure the impact resistance of the wear-resistant tooth 3, the height of the impact-resistant inner core 32 must be greater than or equal to one-half of the height of the wear-resistant body 31, and the height of the impact-resistant inner core 32 is greater than or equal to two-thirds of the height of the root. In this embodiment, it is preferred that the height of the impact-resistant inner core 32 is equal to one-half of the height of the wear-resistant body 31, and the height of the impact-resistant inner core 32 is equal to two-thirds of the height of the root.

[0040] Both axial end faces of the cutter ring base 1 are provided with mounting annular grooves 4, and wear-resistant ring plates 5 are provided in the mounting annular grooves 4. The wear-resistant ring plates 5 are hard alloy plates, and the wear-resistant ring plates 5 are also connected to the cutter ring base 1 by brazing.

[0041] Specifically, the grade of the material of the cutter ring base 1 is H13, the grade of the material of the wear-resistant ring plate 5 is GT35, the grade of the material of the wear-resistant body 31 is GT35, the grade of the impact-resistant inner core 32 is 42CrMo, and the grade of the brazing sheet is HL675 copper welding sheet.

[0042] The specific preparation process of the hard rock cutter ring is as follows:

[0043] (1) Preparation of wear-resistant tooth 3. After GT35 powder is mixed evenly, poured into a mold and pressed into a corresponding shape, 42CrMo steel powder is mixed evenly and poured into the mold, compacted and sintered into a wear-resistant tooth 3 with steel-bonded carbide on the outside and structural steel on the inside.

[0044] (2) Preparation of wear-resistant ring piece 5 GT35 powder is mixed evenly, poured into a mold for pressing, and finally sintered into a ring-shaped steel-bonded cemented carbide piece, namely the wear-resistant ring piece 5 .

[0045] (3) Processing of the cutter ring base 1. After the H13 steel cutter ring base 1 is forged, a number of blind holes are drilled at equal distances on the outer circumference of the cutting edge, which are the mounting holes 2; and circular grooves are machined on both sides of the cutting edge, which are the mounting ring grooves 4.

[0046] (4) Assembly. Apply the brazing flux to the surfaces of the wear-resistant teeth 3, the wear-resistant ring pieces 5, the mounting holes 2 and the mounting grooves, then place the HL675 brazing pieces into the mounting grooves and the mounting holes 2, and then place the wear-resistant teeth 3 into the mounting holes 2 in sequence, and at the same time place the wear-resistant ring pieces 5 into the mounting ring grooves 4.

[0047] (5) Brazing. Use induction heating equipment to heat the cutting edge of the cutter ring substrate 1 to above 1050° C. in sections and in sequence. After the brazing sheet is fully melted and fills the weld, stop heating and cool to room temperature.

[0048] (6) Heat treatment. The brazed hard rock cutter ring is loaded into the furnace as a whole, heated to 1025°C, and kept warm for at least 1.5 hours. The hard rock cutter ring is then quenched into the oil pool for cooling. After the oil cooling is completed, the oil stains on the surface of the cutter ring are wiped off, and the furnace is loaded again, heated to 520°C and kept warm for at least 4 hours, and then taken out of the furnace and air-cooled to room temperature.

[0049] The hard rock cutter ring obtained in the above manner has a cutter ring base 1 with a hardness of 52-55HRC, and a wear-resistant body 31 of the wear-resistant tooth 3 with a hardness of 65-70HRC. The wear-resistant tooth 3 can effectively improve the wear resistance of the hard rock cutter ring, and the impact-resistant inner core 32 can effectively prevent the wear-resistant tooth 3 from breaking when impacted, and can better meet the excavation requirements of high-strength, abrasive hard rock formations.

[0050] In the above embodiments, the wear-resistant teeth and the wear-resistant ring pieces are fixed by brazing, which can ensure the installation reliability of the wear-resistant teeth and the wear-resistant ring pieces. In other embodiments, the wear-resistant teeth can be installed in the installation holes and the wear-resistant ring pieces can be installed in the installation grooves by interference fitting.

[0051] In the above embodiments, the wear-resistant rings and the wear-resistant bodies are made of steel-bonded hard alloy with strong wear resistance. In other embodiments, they can also be ordinary hard alloy or high-speed steel. In addition to metal materials, the wear-resistant rings and the wear-resistant bodies can also be made of polycrystalline diamond.

[0052] In the above embodiments, the wear-resistant ring piece is installed by using the mounting ring groove, which can improve the installation reliability of the wear-resistant ring piece. In other embodiments, the wear-resistant ring piece can also be fixed to the cutter ring base only by welding. Alternatively, a wear-resistant layer can be clad on the cutter ring base, and the wear-resistant ring piece is formed by the wear-resistant layer.

[0053] In the above embodiments, the impact-resistant inner core is a structural steel inner core. In other embodiments, it can also be made of other alloy materials with good impact toughness.

[0054] In the above embodiments, the impact-resistant inner core is located at the root of the wear-resistant body and is completely located in the mounting hole to prevent the head of the wear-resistant body from being too thin, thereby reducing the strength and wear resistance of the wear-resistant body. In other embodiments, if the formation has lower requirements on the strength and wear resistance of the wear-resistant body, the impact-resistant inner core can also extend out of the mounting hole, or the impact-resistant inner core can extend from the root of the wear-resistant body to the head but not penetrate the head.

[0055] The specific embodiment of the hob provided by the utility model:

[0056] A roller cutter comprises a cutter body and a cutter ring mounted on the cutter body. The cutter ring is a hard rock roller cutter ring in a specific embodiment of a hard rock roller cutter ring, which will not be described in detail here.

[0057] Finally, it should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments without creative work, or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A cutter ring for hard rock, comprising a cutter ring base, a mounting hole is arranged on the outer periphery of the cutter ring base, and wear-resistant teeth are arranged in the mounting hole, wherein: The wear-resistant tooth comprises a wear-resistant body and an impact-resistant inner core embedded in the wear-resistant body, and the hardness of the impact-resistant inner core is less than the hardness of the wear-resistant body.

2. The hard rock cutter ring according to claim 1, characterized in that: The wear-resistant body comprises a root portion fixed in the mounting hole and a head portion exposed outside the cutter ring base body, and the impact-resistant inner core is located at the root portion of the wear-resistant body.

3. The hard rock cutter ring according to claim 2, characterized in that: The height of the impact-resistant inner core is greater than or equal to two-thirds of the root height.

4. The hard rock cutter ring according to any one of claims 1 to 3, characterized in that: The height of the impact-resistant inner core is greater than or equal to half of the height of the wear-resistant body.

5. The hard rock cutter ring according to any one of claims 1 to 3, characterized in that: The impact resistant core is a structural steel core.

6. The hard rock cutter ring according to any one of claims 1 to 3, characterized in that: The wear-resistant body is a cemented carbide body.

7. The hard rock cutter ring according to any one of claims 1 to 3, characterized in that: The wear-resistant teeth are connected to the cutter ring base by brazing.

8. The hard rock cutter ring according to any one of claims 1 to 3, characterized in that: The two end surfaces of the cutter ring base body in the axial direction are provided with mounting ring grooves, and wear-resistant ring sheets are arranged in the mounting ring grooves.

9. The hard rock cutter ring according to claim 8, characterized in that: The wear-resistant ring piece and the cutter ring base are connected by brazing.

10. A hob, comprising a cutter body and a cutter ring, characterized in that: The cutter ring is a hard rock cutter ring as described in any one of claims 1 to 9.

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