Suspension type carburizing and quenching tool for cylindrical gear

Abstract

A cylindrical gear suspension type carburizing and quenching tool comprises a square supporting material disc located at the bottom, four supporting stand columns installed at the four corners of the square supporting material disc respectively, upper transverse tie bars and middle transverse tie bars which are installed on the supporting stand columns, and a plurality of sawtooth type supporting cross beams installed on the supporting stand columns in the height direction. The upper portion and the lower portion of each hanging transverse rod are arc-shaped, the middle of each hanging transverse rod is provided with a groove and a meshing protruding head, and the hanging transverse rods are hung on the sawtooth type supporting beam. According to the cylindrical gear suspension type carburizing and quenching tool, carburizing is uniform, quenching quality is stable, waste is reduced, cost is lowered, production efficiency is improved, workpiece deformation is small, labor intensity is lowered, workpieces are convenient to assemble and disassemble, and circular flowing of a cylindrical gear workpiece carburizing atmosphere is facilitated. The device can be widely applied to the cylindrical gear heat treatment process.

Description

Technical Field

[0001] The invention relates to a cylindrical gear suspension type carburizing and quenching tool, which can be widely used in the thermal treatment process of cylindrical gears. Background Art

[0002] The existing cylindrical gear carburizing and quenching generally adopts the method of horizontal placement or stacking for heat treatment. After the end face of the cylindrical gear is quenched, quenching soft spots and uneven hardened layers are prone to occur. Especially when stacked, the uneven phenomenon is more serious, and even local non-carburizing and quenching may occur; the end of the cylindrical gear is deformed greatly, and the plane deformation of the cylindrical gear with a diameter greater than 250mm is more than 0.15mm. Especially when the guide rail in the carburizing furnace is uneven or the material tray is deformed, the rear face deformation of the cylindrical gear after carburizing and quenching is greater. In addition, after horizontal placement or stacking quenching, quenching oil will remain in the shock absorbing groove of the cylindrical gear, causing unnecessary waste, increasing the difficulty of subsequent cleaning and shot blasting, and increasing costs. Summary of the invention

[0003] The purpose of the present invention is to provide a cylindrical gear hanging carburizing and quenching tool which has uniform carburizing, stable quenching quality, reduced waste, lowered costs, improved production efficiency, small workpiece deformation, reduced labor intensity, convenient workpiece loading and unloading, and is conducive to the circulation of carburizing atmosphere for cylindrical gear workpieces.

[0004] In order to achieve the above-mentioned purpose, the cylindrical gear suspended carburizing and quenching tooling of the present invention includes a square supporting material tray located at the bottom, four supporting columns respectively installed at the four corners of the square supporting material tray, upper transverse tie rods and middle transverse tie rods installed on the supporting columns, a plurality of serrated supporting beams installed on the supporting columns along the height direction, a plurality of hanging cross bars with arcs on the upper and lower parts, grooves in the middle, meshing protrusions, and hung on the serrated supporting cross bars, and a plurality of cylindrical gear workpieces suspended on the hanging cross bars with equal gaps.

[0005] The cylindrical gear suspension carburizing and quenching tool of the present invention comprises a square supporting material tray, four supporting columns, upper transverse tie bars, middle transverse tie bars and a suspension cross bar, all of which are made of heat-resistant steel materials that are resistant to high temperatures and carburizing and deformation.

[0006] The cylindrical gear suspension carburizing and quenching tool of the present invention has a meshing convex head of the suspension cross bar and a tooth profile of the sawtooth support cross beam in convex-concave matching contact.

[0007] The cylindrical gear suspension carburizing and quenching fixture of the present invention has a sawtooth support beam with a sawtooth design, which is convenient for stably supporting the suspension cross bar. In addition, the tooth shape is designed symmetrically on the upper and lower sides, and the suspension can be alternately rotated, which is conducive to eliminating thermal deformation and improving the service life of the fixture. The position of the cylindrical gear is fixed during the carburizing and quenching process, which can prevent the cylindrical gears from moving and contacting each other, and avoid the hidden danger of the cylindrical gear falling into the furnace.

[0008] The cylindrical gear suspension carburizing and quenching tool of the present invention fully considers the influence of the suspension contact area on the carburizing and quenching quality of the cylindrical gear, and adopts a line contact design. The entire cylindrical gear is suspended only through the arc edge of the suspension cross bar. The middle of the groove of the suspension cross bar can pass through the carburizing atmosphere and quenching oil, which can ensure the normal carburizing and quenching of the suspension contact area of ​​the gear inner hole.

[0009] The cylindrical gear suspension carburizing and quenching tooling of the present invention has been verified by heat treatment tests that the deformation of the cylindrical gear end face is greatly reduced, and the end face hardening layer of the cylindrical gear can be ensured to be uniform, and the hardness of the end face coupling teeth and bevel teeth is consistent, thus overcoming various drawbacks of traditional carburizing and quenching tooling.

[0010] Compared with the prior art, the cylindrical gear suspension carburizing and quenching tool of the present invention adopts an equal-gap suspension method for the cylindrical gear workpiece. During the carburizing and quenching treatment, the heat treatment is uniform, the carburizing and quenching are sufficient, the surface hardness is uniform and stable, and the hardened layer is uniform. Therefore, the carburizing is uniform and the quenching quality is stable.

[0011] The cylindrical gear suspension carburizing and quenching tool of the present invention has a suspension horizontal bar with an upper and lower arc shape and a middle groove structure, so that the quenching oil can pass through completely during the quenching process, thereby ensuring normal carburizing and quenching of the suspension contact area of ​​the inner hole of the cylindrical gear. It can avoid oil accumulation in the shock absorbing groove after the cylindrical gear is quenched, facilitate the cleaning of the parts, and no cleaning residue is left, thereby reducing the subsequent shot blasting cost. Therefore, waste is reduced and cost is reduced.

[0012] The cylindrical gear suspension carburizing and quenching tool of the present invention does not need turning or grinding of the cylindrical gear end surface after carburizing and quenching, thereby reducing costs, improving production efficiency, and reducing deformation of workpieces.

[0013] The cylindrical gear suspension carburizing and quenching tooling of the present invention is easy to operate and can be equipped with a special crane to reduce labor intensity.

[0014] The cylindrical gear suspension carburizing and quenching tool of the present invention adopts a suspension horizontal bar structure and is flexible to disassemble and replace, so the cylindrical gear workpiece is convenient to load and unload.

[0015] The cylindrical gear suspension carburizing and quenching tool of the present invention adopts four supporting column structures and an equal-gap suspension workpiece structure. The suspension horizontal bar is in an upper and lower arc shape and a middle groove structure, which can pass the carburizing atmosphere and is conducive to the circulation of the carburizing atmosphere of the cylindrical gear workpiece.

[0016] In summary, the cylindrical gear suspended carburizing and quenching tooling of the present invention has uniform carburizing, stable quenching quality, reduced waste, lowered costs, improved production efficiency, small workpiece deformation, reduced labor intensity, convenient workpiece loading and unloading, and is conducive to the circulation of carburizing atmosphere of the cylindrical gear workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments thereof.

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 yes Figure 1 Right view of;

[0020] Figure 3 yes Figure 1 Schematic diagram of the square support tray structure;

[0021] Figure 4 yes Figure 1 Schematic diagram of the suspension crossbar structure;

[0022] Figure 5 yes Figure 4 Right view of . DETAILED DESCRIPTION

[0023] exist Figure 1 to Figure 5 The cylindrical gear suspended carburizing and quenching tooling of the present invention comprises a square supporting material tray 1 located at the bottom, four supporting columns 2 respectively installed at the four corners of the square supporting material tray, upper transverse tie bars 3 and middle transverse tie bars 4 installed on the supporting columns, a plurality of serrated supporting beams 5 installed on the supporting columns along the height direction, a plurality of hanging cross bars 6 with arcs a at the top and bottom, grooves b in the middle, meshing protrusions c and hung on the serrated supporting cross bars, and a plurality of cylindrical gear workpieces 7 suspended on the hanging cross bars with equal gaps.

[0024] The cylindrical gear suspension carburizing and quenching tool of the present invention comprises a square supporting material tray, four supporting columns, upper transverse tie bars, middle transverse tie bars and a suspension cross bar, all of which are made of heat-resistant steel materials that are resistant to high temperatures and carburizing and deformation.

[0025] In the cylindrical gear suspension carburizing and quenching tool of the present invention, the meshing convex head of the suspension cross bar 6 is in convex-concave contact with the tooth profile of the sawtooth support cross beam.

[0026] The cylindrical gear suspension carburizing and quenching tooling of the present invention is only described above as a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent embodiments with equivalent changes without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent replacement and improvement of the above embodiments made according to the technical essence of the present invention, within the spirit and principles of the present invention, still fall within the protection scope of the technical solution of the present invention.

Claims

1. A cylindrical gear suspension carburizing and quenching tool, characterized in that: It includes a square support tray at the bottom, four support columns installed at the four corners of the square support tray, upper transverse tie bars and middle transverse tie bars installed on the support columns, a number of serrated support beams installed on the support columns along the height direction, a number of suspension bars with arcs on the upper and lower parts, grooves in the middle, meshing protrusions and suspended on the serrated support beams, and a number of cylindrical gear workpieces suspended on the suspension bars with equal gaps.

2. The cylindrical gear suspension carburizing and quenching tool according to claim 1, characterized in that: The square supporting material tray, four supporting columns, upper transverse tie bars, middle transverse tie bars, and hanging cross bars are all made of heat-resistant steel materials that are resistant to high temperatures and carburization and deformation.

3. The cylindrical gear suspension carburizing and quenching tool according to claim 1, characterized in that: The engaging protrusion of the hanging cross bar is in contact with the toothed convex and concave conforming contact of the sawtooth type supporting cross beam.

Images