CN209206629U - The dedicated chuck of high speed gear hobber - Google Patents

Abstract

The utility model discloses a special four-jaw chuck for a high-speed gear hobbing machine, which comprises a disc body, a cross-shaped chute is arranged on the upper surface of the disc body, four sets of lead screws are arranged in the cross-shaped chute, and a Four claws, the four claws are respectively connected with four sets of screw drive; the claw is an L-shaped structure with the cross arm facing outward, the outer side of the longitudinal arm of the claw is an arc structure, and the length of the cross arm is smaller than the teeth of the gear The thickness of the root circle distance from the inner hole wall; an inverted L-shaped thin copper plate is fixed by screws on the upper end of the longitudinal arm of the claw, and the longitudinal plate of the inverted L-shaped thin copper plate is attached to the outer surface of the longitudinal arm of the claw. A conical counterbore with a cone angle of 60° is opened at the center of the bottom surface. The utility model has the advantages of simple structure and easy operation. Increasing the load-bearing capacity of the jaws can better clamp the gear, prevent the inner hole of the gear from being damaged, and ensure the machining accuracy of the gear; the conical counterbore can realize automatic centering, which is convenient for connection and assembly with the lower tooling.

Description

Special four-jaw chuck for high-speed gear hobbing machine

technical field

The utility model relates to tooling parts of a gear hobbing machine, in particular to a special four-jaw chuck for a high-speed gear hobbing machine.

Background technique

The three-jaw chuck is also called the three-jaw automatic centering chuck. Its three jaws are linked, which has the advantages of convenient clamping and automatic centering; but the accuracy of the three-jaw chuck will be greatly reduced after a long time. Coaxiality errors are generated, resulting in tool vibration and mandrel positioning deviation during hobbing, resulting in poor product accuracy, unqualified surface roughness or poor radial runout of the processed gears; in addition, using three When jaw chucks are used to process smaller products, the tool holder of the machine tool is prone to interference, resulting in failure to process; therefore, four-jaw chucks (that is, manual four-jaw single-action chucks for machine tools) are often used on existing high-speed gear hobbing machines. The structure includes a The disc body consists of four screw rods vertically and evenly arranged on the disc body, and the claws (four) driven by each screw rod respectively. The claws are a stepped structure whose height gradually decreases from the center of the disc body to the outside. At the same time, the four claws are respectively driven by four lead screws, and each claw moves independently. Although various rectangular or irregular workpieces can be clamped by adjusting the positions of the four claws, the clamping surface of the claws and the workpiece For plane contact, when it is used to clamp gears on a gear hobbing machine, it is easy to damage the inner hole of the gear, and it cannot be automatically centered, which makes it impossible to quickly clamp a large number of gears of the same model.

Contents of the invention

The purpose of the utility model is to provide a special four-claw chuck for a high-speed gear hobbing machine which is convenient for gear clamping and high in positioning accuracy.

In order to achieve the above object, the utility model can take the following technical solutions:

The special four-claw chuck for high-speed gear hobbing machine described in the utility model includes a disc body, the upper surface of the disc body is provided with a cross-shaped chute, and four groups of lead screws are arranged in the cross-shaped chute. There are four claws on the top, and the four claws are respectively connected to the four groups of the screw drive; the claws are L-shaped structures with the horizontal arms facing outward, and the outer surface of the longitudinal arms of the claws is an arc-shaped structure , the length of the cross arm is less than the thickness of the tooth root circle distance from the inner hole wall of the gear; an inverted L-shaped thin copper plate is fitted and fixed by screws on the upper end of the longitudinal arm of the claw, and the longitudinal plate of the inverted L-shaped thin copper plate is connected to the The outer surfaces of the longitudinal arms of the claws are attached to each other, and a conical counterbore with a cone angle of 60° is opened at the center of the bottom surface of the disc body.

The arc-shaped structure on the outer surface of the longitudinal arm of the claw fits snugly with the inner hole wall of the gear.

The utility model has the advantages of simple structure and easy operation. The special claw with L-shaped structure increases the contact area with the gear to be processed, thereby increasing the bearing capacity of the claw; the arc-shaped structure on the outer side of the longitudinal arm of the claw fits closely with the inner hole of the gear to be processed, so that It can better clamp the gear, cooperate with the inverted L-shaped thin copper plate fixed on the upper end of the longitudinal arm, prevent the inner hole of the gear from being stuck, and ensure the machining accuracy of the gear; the cone angle at the center of the bottom surface of the disc body is 60° The counterbore can realize automatic centering, which is convenient for connection and assembly with the lower tooling.

Description of drawings

Fig. 1 is a structural representation of the utility model.

FIG. 2 is a top view of FIG. 1 .

Detailed ways

As shown in Figures 1 and 2, the special four-jaw chuck for high-speed gear hobbing machines described in the present invention includes a disc body 1, a cross-shaped chute 2 is opened on the upper surface of the disc body 1, and four sets of cross-shaped chutes are arranged in the cross-shaped chute 2 The screw is provided with four claws 3 on the cross-shaped chute 2, and the four claws 3 are respectively connected with four sets of screw drive; the claws 3 are L-shaped structures with the horizontal arms facing outward, so that The upper surface of the cross arm can have a larger area in contact with the gear to be processed, thereby increasing the bearing capacity of the jaws. In addition, the length of the cross arm is less than the thickness of the tooth root circle distance from the inner hole wall of the gear to ensure that the hob will not The claw 3 is damaged; the outer surface of the longitudinal arm of the claw 3 is an arc-shaped structure that fits the inner hole wall of the gear, so that it can better clamp the gear and realize the rapid loading and unloading of the same type of gear; The upper end of the longitudinal arm of the claw 3 is attached and fixed with an inverted L-shaped thin copper plate 5 through a screw 4. The vertical plate of the inverted L-shaped thin copper plate 5 is attached to the outer surface of the longitudinal arm of the claw 3. Using the softness of copper, it is matched with the claw 3. The arc-shaped structure on the outer surface of the trailing arm can effectively prevent the inner hole of the gear from being stuck; a conical counterbore 6 with a cone angle of 60° is provided at the center of the bottom surface of the disc body 1, which can realize automatic centering and facilitate the connection with the lower part. The tooling is connected and assembled.

The utility model is very suitable for hobbing gears of the same type in large quantities. When in use, the gears to be processed are placed on the horizontal arms of the jaws 3, the longitudinal arms of the four jaws are located in the inner holes of the gears, and then the lead screws are adjusted respectively. , so that the claw 3 clamps the gear, and then the hobbing work of the gear can be carried out.

Claims (2)

1. a kind of dedicated chuck of high speed gear hobber, including disk body (1), it is sliding that disk body (1) upper surface offers cross Slot (2), the cross chute (2) is interior to be provided with four groups of lead screws, on cross chute (2) there are four settings claw (3), four A claw (3) connect with lead screw transmission described in four groups respectively；It is characterized by: the claw (3) is the L-type of transverse arm outwardly Structure, the trailing arm lateral surface of claw (3) are arcuate structure, and transverse arm length is less than the root circle of gear away from the thickness of inner hole wall； It is fixed with inverted L shape sheet copper (5) in the trailing arm upper end of the claw (3) by screw (4) fitting, the inverted L shape sheet copper (5) The trailing arm lateral surface of stringer board and the claw (3) fit, offering cone angle at the bottom center of the disk body (1) is 60 ° of circular cone counterbore (6).

2. the dedicated chuck of high speed gear hobber according to claim 1, it is characterised in that: outside claw (3) trailing arm The arcuate structure of side is adapted to the fitting of the inner hole wall of gear.