Quenching inductor for crossed roller bearing outer sleeve

Abstract

The utility model belongs to the technical field of quenching inductors, and particularly relates to a quenching inductor for a crossed roller bearing outer sleeve, which comprises an induction coil, a magnetizer is fixedly arranged on the inner side of the top end of the induction coil, and connecting plates are fixedly arranged on the left side and the right side of the bottom end of the induction coil. According to the utility model, through the process separation of'overall heating and overall cooling ', the defect of a soft belt caused by time and space asynchronism of a heating area and a cooling area in the traditional continuous quenching process is fundamentally avoided, the absolute uniformity of the hardness and the structure in the circumferential direction of the bearing sleeve raceway is realized, no weak link exists, and the service life of the bearing sleeve raceway is prolonged. Due to the fact that the whole roller path is heated and cooled at a time, a starting point and ending point overlapping process adopted for eliminating an axial soft belt is completely avoided, the risk of cracking caused by local secondary heating and quenching is thoroughly eliminated, the service life of the crossed roller bearing under the heavy-load and high-precision working conditions is prolonged in a multiplied mode, and the equipment maintenance cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to quenching inductor technical field, concretely relates to a kind of quenching inductor for cross roller bearing outer sleeve. BACKGROUND

[0002] Cross roller bearing is the key basic parts in high-end precision equipment, and the raceway surface of its outer sleeve needs to have extremely high hardness, wear resistance and contact fatigue strength to ensure the bearing carrying capacity, rotation accuracy and service life. Therefore, surface induction quenching is carried out on bearing outer sleeve raceway, which is the core heat treatment process to improve its performance.

[0003] At present, the conventional induction quenching process in this field usually adopts integrated (i.e. heating and spraying cooling integrated) inductor. During processing, workpiece rotates, and inductor moves axially or remains fixed, to continuously heat and cool raceway in sections. However, this continuous production mode of "heating while cooling" has an inherent defect: at the starting point and ending point of quenching process, due to the transient characteristics of heat conduction and the sequence of heating / cooling, the organization transformation of this area is difficult to be completely synchronized with the main body of raceway, and inevitably forms a ring-shaped area with low hardness, i.e. "quenching soft band". Even if the process means is used to overlap the starting and ending points, although the axial soft band can be eliminated, there is a risk of repeated heating and quenching in the overlapping area, which easily causes micro-cracks and is more harmful. This soft band, due to its insufficient hardness, will become a weak link of early wear and fatigue peeling during the service of bearing, not only causing abnormal sound during bearing operation, but also significantly reducing the overall carrying capacity and service life of cross roller bearing, which is difficult to meet the increasingly stringent requirements of high-end market on bearing reliability and durability. SUMMARY

[0004] The utility model aims at providing a kind of quenching inductor for cross roller bearing outer sleeve, which can fundamentally eliminate quenching soft band and realize the uniform high-quality quenching of bearing outer sleeve raceway.

[0005] The technical scheme adopted by the utility model is as follows:

[0006] A kind of quenching inductor for cross roller bearing outer sleeve, comprising an induction coil, a magnetic conductor is fixedly arranged on the inner side of the top end of the induction coil, a connecting plate is fixedly arranged on the left and right sides of the bottom end of the induction coil, and a fixing hole is formed in the end of each connecting plate;

[0007] A fixed plate is fixedly arranged at the rear end of the induction coil, and the rear end of the two fixed plates is fixedly arranged at the front end of the hollow water spraying ring, a plurality of water spraying holes are formed around the outer side of the water spraying ring.

[0008] Further, the inside of the induction coil is provided with a circulating cavity for cooling liquid flow, and the left and right sides of the bottom end of the circulating cavity are fixedly provided with a liquid outlet pipe one and a liquid inlet pipe one, the liquid outlet pipe one and the liquid inlet pipe one are connected with external cooling liquid circulating pipelines.

[0009] Further, the rear end of the water spraying ring is fixedly provided with a liquid inlet pipe two and a liquid outlet pipe two, and the liquid inlet pipe two and the liquid outlet pipe two are connected with external quenching liquid circulating pipelines.

[0010] The technical effects achieved by the utility model are as follows:

[0011] The utility model discloses a "first overall heating, then overall cooling" process, which fundamentally eliminates the soft band defects caused by the asynchronous heating and cooling area in time and space in the traditional continuous quenching process, realizes the absolute uniformity of hardness and organization in the circumferential direction of the bearing outer sleeve raceway, and has no weak link, since the whole raceway is heated and cooled at one time, the start-stop point overlapping process for eliminating the circumferential soft band is completely avoided, thereby completely eliminating the risk of cracking caused by local secondary heating and quenching, the product reliability is extremely high, can effectively delay wear and prevent early peeling, thereby doubling the service life of the cross roller bearing under heavy load and high precision working conditions, and reducing equipment maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 It is the first view structure schematic diagram of the utility model;

[0013] Fig. 2 It is the second view structure schematic diagram of the utility model;

[0014] Fig. 3 It is the sectional structure schematic diagram of the induction coil in the utility model.

[0015] In the drawings, the component list represented by each sign is as follows:

[0016] 1, induction coil;2, liquid inlet pipe one;3, connecting plate;4, water spraying ring;5, magnetic conductor;6, liquid outlet pipe one;7, fixed plate;8, liquid inlet pipe two;9, liquid outlet pipe two;10, circulating cavity. DETAILED DESCRIPTION

[0017] In order to make the purpose and advantages of the utility model more clear and explicit, the utility model is specifically described below in combination with examples. It should be understood that the following text is only used to describe one or several specific embodiments of the utility model, and does not strictly limit the protection scope of the utility model.

[0018] For example, Figs. 1-3As shown, a cross roller bearing sleeve quenching inductor includes an induction coil 1, a magnetic conductor 5 is fixedly arranged at the top end of the induction coil 1, a magnetic conductor 5 is fixedly arranged at the top end of the induction coil 1, for concentrating and guiding the magnetic field, improving the heating efficiency and uniformity, the bottom end of the induction coil 1 is fixedly provided with a connecting plate 3 on the left and right sides, and a fixing hole is formed in the end of each connecting plate 3, and the connecting plate 3 is arranged at the bottom of the induction coil 1, for stably mounting the entire inductor on the mechanical arm of the quenching machine tool, and ensuring the accuracy and repeated positioning accuracy of the inductor during movement between the heating and cooling stations.

[0019] The rear end of the induction coil 1 is fixedly provided with two fixed plates 7, the rear ends of the two fixed plates 7 are fixedly arranged at the front end of the hollow water spraying ring 4, and a plurality of water spraying holes are formed around the outer side of the water spraying ring 4.

[0020] A circulating cavity 10 for cooling liquid flow is formed in the induction coil 1, the left and right sides of the bottom end of the circulating cavity 10 are fixedly provided with an outlet pipe 6 and an inlet pipe 2, respectively, the outlet pipe 6 and the inlet pipe 2 are connected with the external cooling liquid circulating pipeline, and the coil is internally processed with a circulating cavity 10 for cooling liquid flow, which can effectively remove the Joule heat generated by the induction coil 1 itself due to the high-frequency current, prevent the coil from overheating, deformation or damage, ensure the stability of the heating process and the service life of the coil, and the circulating cavity 10 is connected with the external cooling circulating system through the inlet pipe 2 and the outlet pipe 6.

[0021] The rear end of the water spraying ring 4 is fixedly provided with an inlet pipe 8 and an outlet pipe 9, the inlet pipe 8 and the outlet pipe 9 are connected with the external quenching liquid circulating pipeline, a plurality of water spraying holes are uniformly formed around the outer side of the water spraying ring 4, and the cooling medium (usually quenching liquid) can be uniformly and simultaneously sprayed in the form of a ring curtain on the entire raceway surface which has been heated, and the water spraying ring 4 is connected with the external quenching liquid supply system through the independent inlet pipe 8 and the outlet pipe 9.

[0022] The working principle of the utility model is as follows: when quenching the cross roller bearing sleeve, first, the inductor is mounted on the mechanical arm of the quenching machine tool through the connecting plate 3, and the bearing sleeve is clamped on the rotating workbench, after starting the equipment, the workbench drives the bearing sleeve to rotate at high speed, the mechanical arm first executes the heating program, drives the inductor to enter the inner hole of the bearing sleeve along the axial direction, and moves horizontally by a preset distance, so that the outer circle of the induction coil 1 is accurately positioned and close to the root of the raceway to be quenched, at this time, the induction coil 1 is supplied with a medium and high frequency current optimized by process, the raceway of the high-speed rotating bearing sleeve is rapidly and uniformly inducted and heated to the austenitizing temperature (quenching temperature) under the action of the alternating magnetic field, since the heating process is carried out on the induction coil 1 which is stationary in the heating station and the rotating workpiece, the heat is accumulated in the circumferential direction of the raceway synchronously, realizing the whole synchronous heating of 360° without starting point and end point.

[0023] After the heating is completed, the mechanical arm immediately executes a cooling program, the inductor first reverses the transverse movement, retreats to its initial axial position in the hole, and then rises axially by a height, so that the rear following water spraying ring 4 is just aligned with the raceway area heated to quenching temperature, at this time, the external system pumps quenching liquid into the water spraying ring 4, the quenching liquid forms a uniform annular cooling curtain through the circumferentially distributed water spraying holes, and is synchronously sprayed onto the entire raceway surface rotating at high speed, so that the raceway surface is subjected to martensitic phase change and realizes quenching hardening. In the entire heating and cooling process, the bearing outer sleeve is kept in a high-speed rotating state, which further guarantees the uniformity of heating and cooling. After the cooling is completed, the mechanical arm moves the inductor out of the workpiece inner hole, and a quenching cycle is completed.

[0024] The above is only the preferred embodiment of the present application, it should be pointed out that, for those skilled in the art, without departing from the principles of the present application, can make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application. The structures, devices and operation methods not specifically described and explained in the present application, if not specifically described and limited, are implemented according to the conventional means in the art.

Claims

1. A quenching inductor for cross-roller bearing housings, comprising an induction coil (1), characterized in that: The top end inner side of the induction coil (1) is fixedly provided with a magnetic conductor (5), the bottom end left and right sides of the induction coil (1) are fixedly provided with connecting plates (3), and the end of each connecting plate (3) is provided with a fixing hole. The rear end of the induction coil (1) is fixedly provided with two fixed plates (7), the rear ends of the two fixed plates (7) are fixedly provided at the front end of the hollow water spraying ring (4), and the outer side of the water spraying ring (4) is provided with a plurality of water spraying holes.

2. A quenching inductor for cross-roller bearing housings according to claim 1, characterized in that: The inside of the induction coil (1) is provided with a circulating cavity (10) for the flow of cooling liquid, the left and right sides of the bottom end of the circulating cavity (10) are fixedly provided with a liquid outlet pipe one (6) and a liquid inlet pipe one (2), and the liquid outlet pipe one (6) and the liquid inlet pipe one (2) are connected with the external cooling liquid circulating pipeline.

3. A quenching inductor for cross-roller bearing housings according to claim 1, characterized in that: The rear end of the water spraying ring (4) is fixedly provided with a liquid inlet pipe two (8) and a liquid outlet pipe two (9), and the liquid inlet pipe two (8) and the liquid outlet pipe two (9) are connected with the external quenching liquid circulating pipeline.

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