Mining bimetallic sprocket and manufacturing method

Abstract

A kind of mining bimetallic sprocket and manufacturing method, including the following steps, using three fire forging forming mode to the bimetallic profile blank is forged treatment;The sprocket of forging forming is normalized;After the sprocket blank of normalizing is sprocket rough machining tooth groove, inner hole, outer circle, end face;The base body of sprocket is quenched and tempered heat treatment;Outer circle of sprocket base body, tooth type semi-finishing;Finish machining gear.The sprocket piece material of the application can satisfy that sprocket appearance hardness is lower, wear resistance is higher, not easy to wear during use.Connection sleeve material can satisfy that sprocket appearance hardness is lower inner hole hardness is softer, easy to gear.Adopt blank 3 fire forging process, can make blank internal grain refinement.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mining scraper conveyor, in particular to a mining double-metal sprocket and a manufacturing method thereof. BACKGROUND

[0002] In the three-machine-one-frame mining equipment, the scraper conveyor and the transfer machine transmit power and transport through the motor-driven sprocket shaft set, and the sprocket shaft set makes the whole machine run out of coal by meshing with the mining chain. The sprocket is the core part of the scraper conveyor for transmitting power. During the use of the equipment, the sprocket chain nest bears huge alternating load and additional impact load during meshing with the round link chain, resulting in serious wear of the sprocket chain nest. The sprocket frequently wears out during use, causing the sprocket to be not wear-resistant and having a short service life. The mining sprocket is a consumable part, and its service life is only 3-5 months. In order to ensure the safe and stable operation of the sprocket shaft set, the damaged sprocket needs to be replaced frequently. SUMMARY

[0003] In order to solve the above technical problems, it is necessary to provide a manufacturing method of a mining double-metal sprocket.

[0004] A manufacturing method of a mining double-metal sprocket, comprising the following steps,

[0005] Step S1: forging treatment is performed on the double-metal profile blank by adopting the three-fire forging forming mode;

[0006] Step S2: normalizing treatment is performed on the forged sprocket;

[0007] Step S3: rough machining of the sprocket is performed on the sprocket blank after normalizing, including tooth groove, inner hole, outer circle and end face;

[0008] Step S4: quenching and tempering heat treatment is performed on the sprocket base;

[0009] Step S5: semi-finishing machining is performed on the outer circle and tooth type of the sprocket base;

[0010] Step S6: precision machining is performed on the sprocket.

[0011] Preferably, in step S1, the following mode is adopted when the double-metal profile blank is subjected to forging treatment,

[0012] The double-metal profile blank is heated to an initial forging temperature of 1250±10℃, and then after 3h of heat preservation, the double-metal profile blank is subjected to forging treatment;

[0013] When the forging reaches a final forging temperature of 850℃ or below, natural cooling is adopted to 100℃ or above, artificial polishing of the boundary burr is performed, re-heating to the initial forging temperature of the blank is performed, 3h of heat preservation is performed, and then forging is continuously performed;

[0014] According to the above steps, the bimetal profile blank is forged for three times continuously.

[0015] Preferably, in step S2, the normalizing temperature is 860-890°C, and the holding time is 3.5h.

[0016] Preferably, in step S4, the sprocket base is quenched and tempered as a whole, and the inner hole is tempered at high temperature.

[0017] Preferably, the quenching temperature is 880-920°C, the holding time is 3.5h, and the quenching medium is oil.

[0018] Preferably, the tempering temperature is 200±10°C, the holding time is 3.5h, and the outer circle hardness is HRC58-62.

[0019] Preferably, the sprocket inner hole is tempered at medium frequency, the tempering temperature is 650±10°C, the holding time is 2h, and the inner hole hardness is HB280-320.

[0020] It is also necessary to provide a bimetal sprocket for mining.

[0021] A bimetal sprocket for mining is manufactured by the above-mentioned manufacturing method.

[0022] Preferably, the bimetal sprocket for mining comprises a connecting sleeve and sprocket pieces arranged at both ends of the connecting sleeve.

[0023] Preferably, the sprocket pieces are manufactured according to the following metal element composition,

[0024] C: 0.35-0.45%, Mn: 0.5-0.85%, Si: 0.2-0.37%, S: ≤0.005%, P: ≤0.015%, Cr: 2.0-2.6%, Ni: 1.5-2.0%, Mo: 0.25-0.6%, V: 0.15-0.35%, and the rest is Fe and inevitable impurities;

[0025] The connecting sleeve is manufactured according to the following metal element composition,

[0026] C: 0.35-0.42%, Mn: 0.3-0.6%, Si: 0.2-0.45%, S: ≤0.015%, P: ≤0.015%, Cr: 1.35-1.65%, Ni: ≤0.3%, AL: 0.7-1.1%, Mo: 0.15-0.25%, Cu: ≤0.3%, and the rest is Fe and inevitable impurities.

[0027] Compared with the prior art, the mining double-metal sprocket and the manufacturing method provided by the application can strengthen solid solution, purify grain boundaries and refine grains by adding appropriate alloy elements and micro-alloying design, improve quenching property, and make impurity substances disperse and precipitate. Under low impact load, the surface hardness of the sprocket chain nest is further improved after meshing into the chain by strain-induced phase change self-strengthening, and the wear failure of the chain nest is effectively reduced. The sprocket piece material can meet the requirements of low hardness, high wear resistance, and not easy to wear during use. The connecting sleeve material can meet the requirements of low hardness of the sprocket shape and soft hardness of the inner hole, and the tooth is easy to be made. The blank 3 is forged, so that the internal grains of the blank are refined. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0029] Figure 1 It is a product structure schematic diagram of the double-metal sprocket of the present application.

[0030] Figure 2 It is a schematic diagram of the double-metal profile blank of the present application.

[0031] Figure 3 It is a schematic diagram of the double-metal profile blank after forging of the present application.

[0032] In the drawings: DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0034] In the description of the present application, it should be understood that the terms "upper", "middle", "outer", "inner", "lower" and the like indicate the orientation or positional relationship, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated components or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0035] In one embodiment, the present application provides a mining double-metal sprocket manufacturing method, comprising the following steps,

[0036] Step S1: adopt the three fire forging forming way to the bimetal profile blank forging treatment;

[0037] Step S2: the forged sprocket normalizing treatment;

[0038] Step S3: the sprocket blank after normalizing sprocket rough machining tooth groove, hole, round, end face;

[0039] Step S4: the sprocket base quenching and tempering heat treatment;

[0040] Step S5: the sprocket base round, tooth type semi-finishing; At this time, the sprocket base and the connecting sleeve combination place should reserve 20mm processing allowance,

[0041] Step S6: finishing gear.

[0042] Wherein, the bimetal profile blank forging treatment adopts the following way,

[0043] The bimetal profile blank is heated to the initial forging temperature 1250±10℃, then after 3h heat preservation, the bimetal profile blank is forged;

[0044] When the forging reaches the final forging temperature 850℃ or below, the natural cooling method is adopted to 100℃ or above, the boundary burr is artificially polished, the blank is reheated to the initial forging temperature, and after 3h heat preservation, the forging is continued;

[0045] According to the above steps, the bimetal profile blank is forged for three times in succession, which can refine the internal grains of the blank.

[0046] Wherein, when the forged sprocket is normalized, the normalizing temperature is 860-890℃, and the heat preservation time is 3.5h.

[0047] Wherein, when the sprocket base is quenching and tempering heat treatment, the whole quenching + whole low temperature tempering + high temperature tempering hole method is adopted.

[0048] And in the whole quenching, the whole quenching temperature is 880-920℃, the heat preservation time is 3.5h, and the quenching medium is oil.

[0049] And in the whole low temperature tempering, the whole tempering temperature is 200±10℃, the heat preservation time is 3.5h, and the medium is air, room temperature, and the quenching and tempering hardness of the outer circle is HRC58-62.

[0050] And in the high temperature tempering hole, the sprocket hole adopts medium frequency tempering, the tempering temperature is 650±10℃, the heat preservation time is 2h, and the hole hardness is HB280-320.

[0051] In one embodiment, the application provides a mining double-metal sprocket manufactured by a mining double-metal sprocket manufacturing method.

[0052] Specifically, the mining double-metal sprocket comprises a connecting sleeve and sprocket pieces arranged at both ends of the connecting sleeve.

[0053] Specifically, the sprocket pieces are manufactured according to the following metal element components,

[0054] C: 0.35-0.45%, Mn: 0.5-0.85%, Si: 0.2-0.37%, S: ≤0.005%, P: ≤0.015%, Cr: 2.0-2.6%, Ni: 1.5-2.0%, Mo: 0.25-0.6%, V: 0.15-0.35%, and the rest is Fe and inevitable impurities; the sprocket pieces have a tensile strength σb≥1350MPa and a yield strength σs≥1000MPa.

[0055] The connecting sleeve is manufactured according to the following metal element components,

[0056] C: 0.35-0.42%, Mn: 0.3-0.6%, Si: 0.2-0.45%, S: ≤0.015%, P: ≤0.015%, Cr: 1.35-1.65%, Ni: ≤0.3%, AL: 0.7-1.1%, Mo: 0.15-0.25%, Cu: ≤0.3%, and the rest is Fe and inevitable impurities. The nitrided part has a size accuracy after heat treatment, a mechanical property σb≥1000MPa, a yield strength σs≥850MPa, and good machining performance in machining, facilitating tooth making.

[0057] The metal elements of the sprocket pieces and the connecting sleeve are smelted into billets according to the corresponding proportions by using an electric furnace smelting process, the sprocket piece billets and the connecting sleeve billets are forged into shapes by using double-metal forging, the forging loss is accurately calculated, the weight of the connecting sleeve blank is accurately calculated, the sprocket piece billets and the connecting sleeve billets are rolled into double-metal profile blanks, as shown in Figure 2 .

[0058] The above disclosure is only the preferred embodiments of the application, and of course cannot limit the scope of the application, and those skilled in the art can understand that all or part of the above-mentioned embodiments can be implemented, and equivalent changes made according to the claims of the application still belong to the scope of the application.

Claims

1. A method of manufacturing a mining double metal chain wheel, characterized by: It comprises the following steps, Step S1: adopting the way of three forging forming to forge the bimetal profile blank; the sprocket piece part of the bimetal profile blank is composed of the following components with weight percentage: C: 0.35-0.45%, Mn: 0.5-0.85%, Si: 0.2-0.37%, S: ≤0.005%, P: ≤0.015%, Cr: 2.0-2.6%, Ni: 1.5-2.0%, Mo: 0.25-0.6%, V: 0.15-0.35%, the rest being Fe and inevitable impurities; the connecting sleeve part is composed of the following components with weight percentage: C: 0.35-0.42%, Mn: 0.3-0.6%, Si: 0.2-0.45%, S: ≤0.015%, P: ≤0.015%, Cr: 1.35-1.65%, Ni: ≤0.3%, Al: 0.7-1.1%, Mo: 0.15-0.25%, Cu: ≤0.3%, the rest being Fe and inevitable impurities; the specific way of forging treatment is as follows: The bimetal profile blank is heated to the initial forging temperature 1250±10℃, and then the bimetal profile blank is forged after 3h of heat preservation; When the forging reaches the final forging temperature below 850℃, the natural cooling method is adopted to above 100℃, the boundary burr is artificially polished, the blank is reheated to the initial forging temperature, and the forging is continuously carried out after 3h of heat preservation; According to the above steps, the bimetal profile blank is forged for three times in succession; Step S2: normalizing the forged sprocket at 860℃-890℃ for 3.5h; Step S3: rough machining the sprocket blank to perform sprocket tooth groove, inner hole, outer circle and end face; Step S4: quenching and tempering the sprocket base, adopting the way of whole quenching + whole low-temperature tempering + high-temperature tempering inner hole, wherein the whole quenching temperature is 880℃-920℃ for 3.5h, and the quenching medium is oil; the whole tempering temperature is 200±10℃ for 3.5h, so that the outer circle hardness reaches HRC58~62; then the sprocket inner hole is tempered by medium frequency, and the tempering temperature is 650±10℃ for 2h, so that the inner hole hardness reaches HB280-320; Step S5: semi-finishing the outer circle and tooth shape of the sprocket base; Step S6: finishing the tooth.

2. A mining double metal chain wheel characterized by: The mining bimetal sprocket is manufactured by the manufacturing method of claim 1.

3. The mining bi-metallic sprocket as set forth in claim 2, wherein: The mining bimetal sprocket comprises a connecting sleeve and sprocket pieces arranged at both ends of the connecting sleeve.

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