Roll spinning forming device and method for toothed part

Patent metadata

Field	Value
Publication number	US-12179255-B2
Application number	US-201917600121-A
Country	US
Kind code	B2
Filing date	Oct 31, 2019
Priority date	Apr 4, 2019
Publication date	Dec 31, 2024
Grant date	Dec 31, 2024

Abstract

Disclosed is a roll spinning forming device for a toothed part. The device is mounted on a machine tool body. A blank, a mandrel and a driving synchromesh gear are mounted on a machine tool spindle. A driven synchromesh gear and a roller are arranged in parallel on the spindle. The driven synchromesh gear and the roller are connected by a telescopic constant speed universal joint and rotate at a same angular speed. The driven synchromesh gear is driven by a spring mechanism in the radial direction, and the roller is driven by a servo motor assembly in the radial direction. Further disclosed is a roll spinning forming method for a toothed part, the rotating speed of the blank is maintained to be matched with the rotating speed of the roller according to a gear ratio during the movement of the roller toward the blank.

First claim

What is claimed is:

1. A roll spinning forming device for a toothed part, the roll spinning forming device being mounted on a machine tool body, and the roll spinning forming device comprising a spindle, a mandrel, a driving gear, a driven gear, a driven gear support, a roller, a roller support, a telescopic constant speed universal joint assembly, a spring and a servo motor assembly,
wherein the mandrel is mounted on an upper end surface of the spindle, and the driving gear is mounted on the spindle and is located below the mandrel; the driven gear support comprises a first vertical plate and a first bottom plate, the first vertical plate and the first bottom plate are integrally formed, the roller support comprises a second vertical plate and a second bottom plate, the second vertical plate and the second bottom plate are integrally formed, the first bottom plate and the second bottom late are arranged relatively in parallel, the first vertical plate and the second vertical plate are arranged in parallel, an inner side wall of the first vertical plate is contactable with an outer side wall of the second vertical plate, the driven gear is mounted on the first bottom plate through a bearing, the roller is mounted on the second bottom plate through a second bearing, and the driven gear and the roller are arranged in parallel; the telescopic constant speed universal joint assembly is mounted between the driven gear and the roller, such that the driven gear and the roller rotate at a same angular speed and are capable of moving relatively in a radial direction;
one end of the spring is directly connected to an outer side wall of the first vertical plate and the other end of the spring is connected to the machine tool body, and the spring pushes the driven gear support to move towards the spindle; and one end of the servo motor assembly is connected to the outer side wall of the second vertical plate through a bearing assembly and the other end of the servo motor assembly is connected to the machine tool body, and the servo motor assembly drives the roller support to move back and forth in the radial direction and drives the driven gear support to move away from the spindle, and the driven gear is disengaged from the driving gear when the driven gear moves away from the spindle.

2. The roll spinning forming device for the toothed part according to claim 1 , wherein a flow limiting block is arranged on the upper end surface of the spindle, and a diameter of the flow limiting block is greater than an outer diameter of the toothed part.

3. The roll spinning forming device for the toothed part according to claim 2 , further comprising a pressing block pressing a blank used by the spinning formed toothed part on the flow limiting block.

4. The roll spinning forming device for the toothed part according to claim 3 , wherein a diameter of the pressing block is as same as the diameter of the flow limiting block.

5. The roll spinning forming device for the toothed part according to claim 1 , further comprising a pressing block pressing a blank used by the spinning formed toothed part on the mandrel.

6. The roll spinning forming device for the toothed part according to claim 1 , wherein an outer side surface of the mandrel is provided with a tooth shape matched with the toothed part; and an outer side surface of the roller is provided with a tooth shape matched with the toothed part.

7. The roll spinning forming device for the toothed part according to claim 1 , wherein both the driven gear support and the roller support are L-shaped supports.

8. A roll spinning forming method for the toothed part using the device according to claim 1 , the method comprising the following steps:
step 1, mounting and pressing a blank used by a spinning formed toothed part;
step 2, starting the spindle;
step 3, using the servo motor assembly to push the roller support and drive the roller to move towards the spindle, and simultaneously using the spring to push the driven gear support and drive the driven gear to move towards the spindle;
step 4, when the driven gear and the driving gear are in contact with each other and gradually achieve complete engagement and synchronous rotation, enabling the driven gear and the driven gear support to stop moving, making the roller in contact with an outer surface of the blank, and maintaining an angular speed same as an angular speed of the driven gear under driving of the telescopic constant speed universal joint assembly;
step 5, continuously pushing the roller by the servo motor assembly to move towards the spindle, providing a thrust by the spring to enable the driven gear to be completely engaged with the driving gear, enabling the roller to maintain a constant speed ratio with the blank under an action of the driven gear and the driving gear which are completely engaged with each other, and pressing the roller into the blank until forming a required tooth shape on the outer surface of the blank;
step 6, in a case that the driven gear and the driving gear are maintained to be completely engaged with each other, driving the roller and the roller support by the servo motor assembly to move away from the spindle until the roller is completely disengaged from the formed toothed shape;
step 7, using the servo motor assembly to continuously drive the roller support to move away from the spindle, and drive the driven gear support to move away from the spindle until the driven gear is completely disengaged from the driving gear; and
step 8, stopping the spindle and disassembling the formed toothed part.

9. The roll spinning forming method for the toothed part according to claim 8 , wherein under a condition that the driven gear is completely engaged with the driving gear, the roller is mounted and is aligned with a phase angle of the mandrel.

10. The roll spinning forming method for the toothed part according to claim 8 , wherein a rotation direction of the spindle in the step 5 is alternately forward and reverse.

Assignees

• Univ South China Tech

Inventors

• Xia Qinxiang
• Cheng Xiuquan
• Xiao Gangfeng
• Bian Xuyang

Classifications

• B21D53/28

  gear wheels · CPC title

• B21D43/003

  Positioning devices (B21D28/04 and B21D28/265 take precedence; stops B21D43/26; centering moving strips B21D43/023) · CPC title

• B21H5/02 Primary

  with cylindrical outline {, e.g. by means of die rolls (worms B21H5/005)} · CPC title

• B21D22/16 Primary

  over shaping mandrels or formers · CPC title