阅读说明：本技术 一种截齿及其加工方法 (Cutting pick and machining method thereof ) 是由 刘能文 黄灿 于 2020-06-30 设计创作，主要内容包括：本发明涉及一种截齿,包括硬质合金头和截齿基体,所述截齿基体包括齿柄和位于齿柄顶端的齿身,所述截齿基体端面中心设置有一个连接孔,所述硬质合金头连接部设置在连接孔内,并通过钎焊与截齿基体相连接,钎焊所使用的的焊料为铜钎焊料,所述硬质合金头连接部下端为锥形,所述连接孔形状与硬质合金头连接部形状相同,所述硬质合金头连接部与连接孔内壁存在0.08～0.15mm的间隙,所述硬质合金头上端采用多锥度设计。本发明提供了一种可以截齿焊接强度更高、耐磨性更高、抗冲击性更高的截齿及其加工方法。(The invention relates to a cutting pick, which comprises a hard alloy head and a cutting pick base body, wherein the cutting pick base body comprises a tooth handle and a tooth body positioned at the top end of the tooth handle, a connecting hole is formed in the center of the end face of the cutting pick base body, a connecting part of the hard alloy head is arranged in the connecting hole and is connected with the cutting pick base body through brazing, a brazing material used for brazing is a copper brazing material, the lower end of the connecting part of the hard alloy head is conical, the shape of the connecting hole is the same as that of the connecting part of the hard alloy head, a gap of 0.08-0.15 mm exists between the connecting part of the hard alloy head and the inner wall of the connecting hole, and the upper end of the. The invention provides a cutting pick with higher welding strength, higher wear resistance and higher impact resistance and a processing method thereof.)

1. The utility model provides a cutting pick, includes carbide head (1) and cutting pick base member (3), cutting pick base member (3) include tooth handle (31) and tooth body (32) that are located tooth handle (31) top, its characterized in that, tooth body (32) terminal surface center is provided with a connecting hole, carbide head connecting portion (2) set up in the connecting hole to be connected with tooth body (32) through brazing, the solder that the brazing used is the brazing material, carbide head connecting portion (2) lower extreme is the toper, the connecting hole shape is the same with carbide head (1) connecting portion shape, there is 0.08 ~ 0.15 mm's clearance in carbide head connecting portion (2) and the connecting hole inner wall, carbide head (1) upper end adopts many tapers to design.

2. A manufacturing method of a cutting pick is characterized by comprising the following steps:

step 1: performing early treatment, namely forming a cutting pick base body (3) by adopting a cold extrusion technology, wherein the size of a connecting hole is required to ensure that a gap of 0.08-0.15 mm exists between the inner wall of the connecting hole and a hard alloy head (1), cleaning the connecting hole by using 95-degree ethanol, putting copper brazing solder after cleaning, and smearing a layer of soldering flux on a connecting part (2) of the hard alloy head to be arranged in the connecting hole of a pick body (32);

step 2: heating and welding, namely putting the installed hard alloy head (1) and the cutting pick substrate (3) into a heating furnace with 200KW intermediate frequency of 3.5 kilohertz for heating and welding to form a cutting pick;

and step 3: quenching treatment, namely cooling the cutting teeth to 850-860 ℃, and putting into 60-degree quenching oil for quenching;

and 4, step 4: and (4) tempering, namely putting the quenched substrate into a tunnel tempering furnace for low-temperature tempering at 200 ℃ for 180 minutes.

And 5: and (4) performing shot blasting treatment, finally performing shot blasting treatment on the tempered cutting pick, and smearing a layer of anti-rust oil on the whole cutting pick after the shot blasting treatment is finished.

3. A cutting pick making method according to claim 2, wherein the cutting pick body (3) material is 42Crmo ultra high strength steel.

4. The cutting pick manufacturing method according to claim 2, wherein the brazing solder is Cu, Mn, Ni, Si and Zn, and the weight ratio of the Cu, Mn, Ni, Si and Zn is 54-56%: 4.0% -6.0%: 6.0% -8.0%: 0.15% -0.45%: 31.35 to 33.35 percent.

5. A cutting pick making method according to claim 2, wherein only the body (32) of the cutting pick body (3) is heated during said heat welding process.

Technical Field

The invention belongs to the technical field of heading machines, coal mining machines and rotary drilling accessory machines, and particularly relates to a cutting tooth and a machining method thereof.

Background

The cutting pick is formed by connecting a cutting pick base body (a cutting pick body and a cutting pick handle) and a hard alloy head together in a brazing mode. Is a main matching part (a vulnerable part) which is arranged on a tooth holder of a heading machine, a coal mining machine and a rotary excavating machine and is used for crushing coal rocks. The cutting pick is mainly manufactured by the following steps: the method comprises the steps of pretreatment (cleaning a cutting pick matrix, holding brazing solder, coating a hard alloy head and assisting in welding), brazing (integral heating and brazing), quenching and tempering (medium-temperature tempering). Common failure modes of picks include alloy head drop, shank breakage, pick body wear, alloy head breakage, pick loss, and the like. Wherein tooth body wear and alloy head drop off account for approximately 80% of total failure. The main reason for these failure modes is that the cutting tooth has severe friction with coal rocks during operation, which causes abrasion of the front end of the tooth body, and after the abrasion reaches a certain degree, the hard alloy head is exposed, and then the hard alloy head falls off due to strong impact load. On the other hand, the main reasons for the falling off of the cemented carbide tip are welding quality problems, such as welding deviation of the cemented carbide tip, cold joint, slag inclusion at the welding position, and the like.

Disclosure of Invention

The invention aims to improve and innovate the defects and problems in the background art, and provides a cutting pick with higher welding strength, higher wear resistance and higher impact resistance and a processing method thereof.

The technical scheme includes that the cutting pick comprises a hard alloy head and a cutting pick base body, the cutting pick base body comprises a tooth handle and a tooth body located at the top end of the tooth handle, a connecting hole is formed in the center of the end face of the tooth body, a hard alloy head connecting portion is arranged in the connecting hole and connected with the tooth body through brazing, a brazing material used for brazing is a copper brazing material, the lower end of the hard alloy head connecting portion is conical, the shape of the connecting hole is the same as that of the hard alloy head connecting portion, a gap of 0.08-0.15 mm exists between the hard alloy head connecting portion and the inner wall of the connecting hole, and the upper end of the hard alloy head is designed in a multi-taper mode.

The invention also provides a manufacturing method of the cutting pick, which comprises the following steps:

step 1: performing early treatment, namely forming a cutting pick base body by adopting a cold extrusion technology, wherein the size of a connecting hole is required to ensure that a gap of 0.08-0.15 mm exists between the inner wall of the connecting hole and a hard alloy head, cleaning the connecting hole by using 95-degree ethanol, putting copper brazing solder after cleaning, and smearing a layer of soldering flux on a connecting part of the hard alloy head to be arranged in the connecting hole of the cutting pick body;

step 2: heating and welding, namely putting the installed hard alloy head and the cutting pick substrate into a heating furnace with 200KW intermediate frequency of 3.5 kilohertz to be heated and welded into a cutting pick;

and step 3: quenching treatment, namely cooling the cutting teeth to 850-860 ℃, and putting into 60-degree quenching oil for quenching;

and 4, step 4: and (4) tempering, namely putting the quenched substrate into a tunnel tempering furnace for low-temperature tempering at 200 ℃ for 180 minutes.

And 5: and (4) performing shot blasting treatment, finally performing shot blasting treatment on the tempered cutting pick, and smearing a layer of anti-rust oil on the whole cutting pick after the shot blasting treatment is finished.

Preferably, the cutting pick base material is 42Crmo ultra-high strength steel.

Preferably, the brazing solder is Cu, Mn, Ni, Si and Zn, and the weight ratio of the Cu, Mn, Ni, Si and Zn is 54-56%: 4.0% -6.0%: 6.0% -8.0%: 0.15% -0.45%: 31.35 to 33.35 percent.

Preferably, the heat welding process heats only the body of the cutting pick body.

The invention has the beneficial effects that:

1. the cutting pick substrate is made of 42Crmo ultrahigh-strength steel and is formed by adopting a cold extrusion technology. The 42Crmo ultrahigh-strength steel has high strength and toughness, good hardenability and no obvious temper brittleness, and the structure is compact and continuous fiber flow direction is realized after the steel is formed by adopting a cold extrusion technology, so that the strength of a cutting pick matrix is greatly improved.

2. The upper end of the hard alloy head adopts a multi-taper design, and the lower end adopts a conical design, wherein the multi-taper design of the upper end can greatly improve the rock breaking efficiency, and the conical design of the lower end has a centering effect, so that the welding seam clearance around the hard alloy head is kept uniform and consistent, and the brazing strength is greatly improved.

3. Only the tooth body part is heated by a heating furnace with 200KW intermediate frequency and 3.5 kilohertz, and the quenched cutting tooth is put into a tunnel tempering furnace for low-temperature tempering at 200 ℃ for 180 minutes. The process greatly reduces the oxidation and decarburization phenomena generated in the heating process, enables the tooth handle to have higher strength and impact toughness, and simultaneously ensures the tooth body to have the advantages of higher hardness and wear resistance.

Drawings

Figure 1 is a schematic view of a cutting pick construction.

FIG. 2 is a process flow diagram.

Description of the figures:

1-hard alloy head, 2-hard alloy head connecting part, 3-cutting pick base body, 31-tooth handle and 32-tooth body.

Detailed Description

The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto. The embodiments of the present invention are not limited to the embodiments described above, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and they are included in the scope of the present invention.