An induction hardening device for the concave spherical surface of the connecting seat of the blade

Abstract

The invention belongs to the technical field of induction heat treatment, and relates to an induction quenching apparatus used for the concave spherical surface of a scraper knife connecting seat, and an operation method thereof. The induction quenching apparatus used for the concave spherical surface of a scraper knife connecting seat comprises a semi-circular stepped shielding ring (4), a whole-circular stepped shielding ring (5), a revolution assembly (6), a rotation driving assembly (7), a cabinet assembly (8) and an electric control cabinet (9); the upper end of the rotation driving assembly (7) is fixedly connected with the revolution assembly (6), and the lower end of the rotation driving assembly (7) is fixedly connected to the internal of the cabinet assembly (8); and the upper end of the revolution assembly (6) is provided with the whole-circular stepped shielding ring (5). The apparatus effectively avoids the acute angle effect of the concave spherical surface during induction quenching, and solves a problem that the horizontal induction spacing of the spherical surface is difficult to control when the concave spherical surface of the scraper knife connecting seat rotates around the external arc surfaces (3d') of the induction rings of the apparatus, so the induction quenching hardening layer of the concave spherical surface is effectively controlled, thereby the quenching quality is improved.

Description

technical field [0001] The invention belongs to the technical field of induction heat treatment, and relates to an induction hardening device and an operation method for a concave spherical surface of a blade connecting seat, which are used for induction hardening of an upper cover concave spherical surface and a lower seat concave spherical surface on a bulldozer blade connecting seat. Background technique [0002] Knownly, the blade on the bulldozer is driven and cooperated with the oil cylinder on the bulldozer through the blade connecting seat to realize its required universal rotation function. The blade connection seat is a general term for a combination, including an upper cover "with a concave spherical surface" and a lower seat "with a concave spherical surface", and the two are connected as a whole with connecting bolts. [0003] Next, give an example of the blade connecting seat used on a bulldozer, and describe its structure in detail, as follows: [0004] 1. Th...

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Problems solved by technology

[0010]The disadvantage of this method is that the hardness of parts that do not need to be hardened other than the concave spherical surface is too high after quenching, which is difficult to meet the actual use requirements

[0012] The disadvantage of this method is that the flame heating time, heating distance, moving speed and distance are manually operated according to the experience of the operator, and the heating temperature, heating speed, heating The precise position is difficult to control, so that the quenching hardness, depth of hardened layer, and quenching uniformity of the concave spherical surface are difficult to meet the requirements of use. Improper operation may even cause melting and cracking of the concave spherical surface, resulting in the scrapping of the blade connection seat

[0014]1. Sharp corner effect is inevitable

By Figure 1, Figure 2, Figure 3, Figure 4, we know that because of the α1 at the front sharp corner of the upper cover, the α2 at the rear sharp corner of the upper cover, the β1 at the front sharp corner of the lower seat, and the rear sharp corner of the lower seat of the blade connecting seat The existence of β2 at the corner is easy to produce a sharp corner effect when local induction hardening is carried out, that is, during local induction hardening, the current at the sharp corner is dense, and it is easy to cause overheating or overburning, and even quenching cracks

[0015]2. The sensing distance is difficult to control

[0016]3. Low-speed rotation is difficult to achieve

At present, the rotational speed of the main shaft of the slewing device of general quenching equipment is usually set within 6-210 r / min. It has been confirmed through experimental research that the minimum rotational speed within this rotational speed range is too high, and local induction hardening of the concave spherical surface of the blade connection seat requires It is carried out at a speed of about 2 rpm, so the general quenching equipment cannot meet the quality control requirements of the local induction quenching of the concave spherical surface of the blade connection seat

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