A fixture for carburizing and quenching thin-walled gears

Abstract

This utility model relates to the field of heat treatment technology for thin-walled gears, and discloses a fixture for carburizing and quenching thin-walled gears. The fixture includes a base, a mounting groove on the top edge of the base, an inner wall of the mounting groove that is slidably connected to the surface of a column, a surface of the column that is slidably connected to the inner wall of a lifting block, a lifting hook fixedly connected to the side of the base, a fixing mechanism on the surface of the column, a clamping mechanism in the middle of the fixing mechanism, and a thin-walled gear mounted on the base. This utility model uses threaded rods penetrating both ends to clamp the clamping plate and gear between the two fixing plates using nuts, preventing deformation of the gear during quenching. The opening of the connecting groove and the vortex groove allows the carbon-containing gas flow to fully contact the gear surface, preventing insufficient carburizing and resulting in insufficient gear hardness. The locking protrusion restricts the movement of the gear.

Description

Technical Field

[0001] This utility model relates to the field of heat treatment technology for thin-walled gears, and in particular to a fixture for carburizing and quenching thin-walled gears. Background Technology

[0002] Thin-walled gears are mechanical transmission components characterized by a wall thickness much smaller than their diameter or radius. The main functions of carburizing and quenching them include improving surface hardness, wear resistance, and fatigue strength, while maintaining good core strength and toughness.

[0003] Existing thin-walled gear carburizing and quenching fixtures have excessively large contact areas during the carburizing and quenching process, resulting in poor gas circulation, insufficient carburizing, and uneven heating of the gear. This easily leads to uneven hardened layer depth. Furthermore, most manufacturers use flat-lay quenching, which can cause inconsistent cooling rates on both sides of the gear during cooling, resulting in severe ellipticity of the inner hole, planar warping, and elliptical deformation. These problems lead to uneven distribution of tooth surface allowance during grinding, resulting in black scale and grinding steps on the tooth surface, ultimately rendering the gear unusable. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a fixture for carburizing and quenching thin-walled gears.

[0005] This utility model is achieved by the following technical solution: a fixture for carburizing and quenching thin-walled gears, including a base, mounting grooves are provided at the four corners of the top of the base, a column is slidably connected to the inner wall of the mounting groove, a lifting block is slidably connected to the surface of the column, a lifting hook is fixedly connected to the surface of the base, a fixing mechanism is provided on the surface of the column, and a clamping mechanism is provided in the middle of the fixing mechanism.

[0006] The fixing mechanism includes a mounting plate with mounting holes at both ends, a positioning groove on the surface of the mounting plate, a locking plate on the top of the mounting plate, a support rod inside the positioning groove, and a limit plate at the upper end of the mounting plate.

[0007] The above technical solution uses two support rods to connect the spacing of the positioning groove to accommodate thin-walled gears of different sizes, increasing the flexibility of the device.

[0008] As a further improvement to the above solution, the inner wall of the mounting hole is slidably connected to the surface of the column, and the inner wall of the positioning plate is slidably connected to the surface of the column.

[0009] As a further improvement to the above solution, the inner wall of the limiting plate is slidably connected to the surface of the column.

[0010] As a further improvement to the above solution, the clamping mechanism includes a fixed plate, a threaded rod is threadedly connected to the inner wall of the fixed plate, a nut is threadedly connected to the surface of the threaded rod, a clamping piece is sleeved on the surface of the threaded rod, a plurality of connecting grooves are opened on the surface of the clamping piece, vortex grooves are opened at both ends of the clamping piece, a through groove is opened in the middle of the clamping piece, and locking protrusions are fixedly connected to both ends of the clamping piece.

[0011] Through the above technical solution, the threaded rods that run through both ends allow the fixing plates to clamp the clamping pieces and gears between the two fixing plates with nuts, preventing deformation during gear quenching. The opening of the connecting groove and the vortex groove allows the carbon-containing gas flow to fully contact the gear surface, preventing insufficient carburization that would result in the gear's hardness not meeting the standard.

[0012] As a further improvement to the above solution, the inner wall of the fixing plate is slidably connected to the surface of the support rod, and a thin-walled gear is provided on the outside of the threaded rod.

[0013] As a further improvement to the above solution, the inner wall of the connecting groove is slidably connected to the surface of the support rod.

[0014] As a further improvement to the above solution, the surface of the locking protrusion contacts the interior of the thin-walled gear.

[0015] The above technical solution restricts the movement of the gear by using the locking protrusion, ensuring that the gear will not deform due to displacement during the carburizing and quenching process.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] This utility model increases the flexibility of the device by setting a fixing mechanism, specifically by using two support rods to connect the spacing of the positioning groove to accommodate thin-walled gears of different sizes. The positioning plate fixes the column to prevent the column from deforming and the gears from falling and being damaged when the crane moves the device.

[0018] This utility model features a clamping mechanism, specifically a threaded rod extending through both ends, which clamps the clamping piece and gear between the two fixing plates using nuts. The locking protrusion restricts the movement of the gear, ensuring that the gear will not deform due to displacement during carburizing and quenching. The opening of the connecting groove and the vortex groove allows the carbon-containing gas flow to fully contact the gear surface, while the heating is uniform, preventing insufficient carburizing that would result in the gear not meeting the required hardness. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the fixed structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the overall cross-sectional structure of this utility model;

[0023] Figure 5 This is a schematic diagram of the clamping structure of this utility model.

[0024] Explanation of key symbols:

[0025] 1. Base; 2. Mounting slot; 3. Column; 4. Heightening block; 5. Lifting hook; 6. Fixing mechanism; 601. Mounting plate; 602. Mounting hole; 603. Positioning slot; 604. Locking plate; 605. Support rod; 606. Limiting plate; 7. Clamping mechanism; 701. Fixing plate; 702. Threaded rod; 703. Nut; 704. Clamping piece; 705. Connecting slot; 706. Vortex slot; 707. Through slot; 708. Locking protrusion; 8. Thin-walled gear. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0027] Example:

[0028] Please combine Figure 1-5 This embodiment of a fixture for carburizing and quenching thin-walled gears includes a base 1, mounting grooves 2 are provided at the four corners of the top of the base 1, a column 3 is slidably connected to the inner wall of the mounting groove 2, a lifting block 4 is slidably connected to the surface of the column 3, a lifting hook 5 is fixedly connected to the surface of the base 1, a fixing mechanism 6 is provided on the surface of the column 3, and a clamping mechanism 7 is provided in the middle of the fixing mechanism 6.

[0029] The fixing mechanism 6 includes a mounting plate 601. Mounting holes 602 are provided at both ends of the mounting plate 601. Positioning grooves 603 are provided on the surface of the mounting plate 601. A locking plate 604 is provided on the top of the mounting plate 601. The locking plate fixes the column to prevent deformation of the column and damage to the gears when the crane moves the device. A support rod 605 is provided inside the positioning groove 603. The spacing of the positioning groove is connected by two support rods to adapt to thin-walled gears of different sizes, which increases the flexibility of the device. A limit plate 606 is provided at the upper end of the mounting plate 601.

[0030] The inner wall of the mounting hole 602 is slidably connected to the surface of the column 3, and the inner wall of the positioning plate 604 is slidably connected to the surface of the column 3.

[0031] The inner wall of the limiting plate 606 is slidably connected to the surface of the column 3.

[0032] The clamping mechanism 7 includes a fixed plate 701, with a threaded rod 702 threadedly connected to the inner wall of the fixed plate 701. A nut 703 is threadedly connected to the surface of the threaded rod 702. A clamping piece 704 is fitted onto the surface of the threaded rod 702. Several connecting grooves 705 are formed on the surface of the clamping piece 704. Vortex grooves 706 are formed at both ends of the clamping piece 704. Through the opening of the connecting grooves and vortex grooves, the carbon-containing gas flow can fully circulate and contact the gear surface, while heating is uniform, preventing insufficient carburization and the intermediate gear hardness from not meeting the standard. A through groove 707 is formed in the middle of the clamping piece 704. Locking protrusions 708 are fixedly connected to both ends of the clamping piece 704. The locking protrusions restrict the movement of the gear, ensuring that the gear will not deform due to displacement during the carburizing and quenching process.

[0033] The inner wall of the fixing plate 701 is slidably connected to the surface of the support rod 605, and a thin-walled gear 8 is provided on the outside of the threaded rod 702.

[0034] The inner wall of the connecting groove 705 is slidably connected to the surface of the support rod 605.

[0035] The surface of the locking protrusion 708 contacts the interior of the thin-walled gear 8.

[0036] The implementation principle of a fixture for carburizing and quenching thin-walled gears in this embodiment is as follows: When using the fixture, select a clamping piece 704 of the corresponding size, then install the column 3 on the base 1 through the mounting groove 2. Add a height-increasing block 4 to the column 3 according to its height, and then install the mounting plate 601. Connect one end of the support rod 605 to the fixing plate 701, and then install the clamping piece 704 and the thin-walled gear 8 in sequence. Through the opening of the connecting groove 705 and the vortex groove 706, the carbon-containing gas flow can fully contact the gear surface, preventing insufficient carburizing and resulting in insufficient hardness of the intermediate gear. The locking protrusion restricts the movement of the gear, ensuring that the gear will not deform due to displacement during the carburizing and quenching process. After installation, install the fixing plate 701 at the other end, and then pass the threaded rod 702 through the through groove 707. The fixing plates 701 at both ends are then locked with nuts 703. The threaded rods 605 passing through both ends allow the fixing plates 701 to clamp the clamping piece 704 and the thin-walled gear 8 between the two fixing plates 701 with nuts 703, preventing deformation of the gear during quenching. The support rods 605 with the gear installed are placed into the appropriate positioning grooves 603. The spacing between the two support rods 605 and the positioning grooves 603 is used to adapt to the different sizes of thin-walled gears 8, increasing the flexibility of the device. The limiting plate 606 is installed on the column 3 through the mounting hole 602, and the locking plate 604 is covered. The locking plate 604 fixes the column 3 to prevent deformation of the column 3 and damage to the gear when the crane moves the device. Then, the lifting and unhooking 5 uses a crane to send the entire structure into the carburizing furnace.

[0037] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A fixture for carburizing and quenching a thin-walled gear, characterized by, Includes a base (1), with mounting grooves (2) at the four corners of the top of the base (1), a column (3) slidably connected to the inner wall of the mounting groove (2), a heightening block (4) slidably connected to the surface of the column (3), a lifting hook (5) fixedly connected to the surface of the base (1), a fixing mechanism (6) provided on the surface of the column (3), and a clamping mechanism (7) provided in the middle of the fixing mechanism (6); The fixing mechanism (6) includes a mounting plate (601), with mounting holes (602) at both ends of the mounting plate (601), a positioning groove (603) on the surface of the mounting plate (601), a locking plate (604) on the top of the mounting plate (601), a support rod (605) inside the positioning groove (603), and a limiting plate (606) at the upper end of the mounting plate (601).

2. A fixture for carburizing and quenching thin wall gears as defined in claim 1 wherein: The inner wall of the mounting hole (602) is slidably connected to the surface of the column (3), and the inner wall of the positioning plate (604) is slidably connected to the surface of the column (3).

3. A fixture for carburizing and quenching thin wall gears as defined in claim 1 wherein: The inner wall of the limiting plate (606) is slidably connected to the surface of the column (3).

4. A fixture for carburizing and quenching thin-walled gears as described in claim 1, characterized in that: The clamping mechanism (7) includes a fixed plate (701), the inner wall of the fixed plate (701) is threaded with a threaded rod (702), the surface of the threaded rod (702) is threaded with a nut (703), the surface of the threaded rod (702) is fitted with a clamping piece (704), the surface of the clamping piece (704) is provided with a plurality of connecting grooves (705), the two ends of the clamping piece (704) are provided with vortex grooves (706), the middle part of the clamping piece (704) is provided with a through groove (707), and the two ends of the clamping piece (704) are fixedly connected with locking protrusions (708).

5. A fixture for carburizing and quenching thin-walled gears as described in claim 4, characterized in that: The inner wall of the fixing plate (701) is slidably connected to the surface of the support rod (605), and a thin-walled gear (8) is provided on the outside of the threaded rod (702).

6. A fixture for carburizing and quenching thin-walled gears as described in claim 4, characterized in that: The inner wall of the connecting groove (705) is slidably connected to the surface of the support rod (605).

7. A fixture for carburizing and quenching thin-walled gears as described in claim 4, characterized in that: The surface of the locking protrusion (708) contacts the interior of the thin-walled gear (8).

Images