A high-speed high-precision main shaft HSK tool holder puller device

Abstract

The application discloses a high-speed high-precision main shaft HSK tool shank puller device. The puller device is located at the front position of the inside of the main shaft core, and comprises a puller claw core, a puller claw piece, a double-end screw rod, a guide ring, a push rod and a positioning snap ring. One end of the HSK tool shank is inserted into the main shaft core, the puller claw piece is installed outside the puller claw core, the d part small slope of the puller claw piece is in close contact with the small slope of the front section of the outer contour of the puller claw core in the state of the tool shank tension, the puller claw piece is expanded outward, the axial locking force provided by the disc spring is enlarged through the d part small slope of the puller claw piece, and the HSK tool shank is tensioned. The components are matched with each other, the number of parts is small, the parts are easy to process, the assembly is simple, the three-arc assembly positioning precision is high, the movable range is fixed, the contact surface is small and not easy to be stuck, the stability and reliability are strong, the self-lubricating sleeve is used to improve the concentricity and reduce the friction, the puller device is solid and durable, the service life is prolonged, and the automatic tool changing working condition is matched.

Description

Technical Field

[0001] This invention relates to a broaching device for use with spindles, and more particularly to a broaching device for use with HSK tool holders of high-speed, high-precision spindles. Background Technology

[0002] With the development of the times, industries such as aerospace, automotive, and mold making have placed higher demands on processing quality and production efficiency. Manually changing toolholders is time-consuming and labor-intensive, leading to the widespread application of automatic tool changing technology. High-speed, high-precision spindles are core components of precision machine tools. The broaching device for HSK toolholders on high-speed, high-precision spindles is used in scenarios requiring frequent tool changes, enabling automatic loading and unloading of the toolholder to meet various complex working conditions. This invention provides a broaching device that, through the mutual constraint and matching of fewer components, can accurately position opening and closing, effectively reducing costs while ensuring processing accuracy and service life. Summary of the Invention

[0003] This invention addresses the problems frequently encountered in current spindle broaching devices, such as insufficient rigidity of the tool holder connection, inaccurate positioning of the tool holder by the broaching device, and slow tool holder replacement. It provides a broaching device for high-speed, high-precision spindle HSK tool holders.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: The broaching device of the present invention is located at the front section of the inner side of the spindle core, including a broaching claw core, a broaching claw plate, a double-ended screw, a guide ring, a push rod, and a positioning retaining ring. One end of the HSK tool holder is inserted into the spindle core, and the broaching claw plate is installed outside the broaching claw core. When the tool holder is tightened, the small inclined surface at part d of the broaching claw plate fits against the small inclined surface at the front section of the outer contour of the broaching claw core, causing the broaching claw plate to expand outward. The small inclined surface at part d of the broaching claw plate amplifies the axial locking force provided by the disc spring to provide a clamping force that meets the requirements of DIN 69893, thereby tightening the HSK tool holder.

[0005] The broach claw 4 is installed and positioned between the spindle core and the broach claw core by relying on the mutual constraint of the three arc segments a, b, and c.

[0006] The outer tail section of the broach claw 4 has a groove, in which a positioning ring 10 is installed. During the tightening and loosening of the tool holder, the small bevel of the d-section of the broach claw 4 is kept in contact with the outer contour of the broach claw core 3 by the elastic deformation of the positioning ring 10. The positioning ring 10 also serves to separate the multiple broach claw segments 4 to prevent them from contacting each other.

[0007] When the tool holder is loosened, the puller claw core 3 and the guide ring 6 are connected to the push rod 9 via the double-ended screw 5. The push rod 9 is pushed by an external electric cylinder, pneumatic cylinder or hydraulic cylinder, and the guide ring 6 is pushed down synchronously. When the tool holder is loosened, the curved surface of the guide ring 6f is inserted into the inner side of the puller claw 4, and is mutually constrained with the curved surface of the puller claw 4e. Even if the positioning retaining ring 10 fails to deform and jams, the head of the puller claw 4 can be pried inward by using the arc surface of the puller claw 4a as a fulcrum. This ensures that the small inclined surface of the puller claw 4d fits into the inclined groove of the rear section of the puller claw core 3, allowing the clearance required for the HSK tool holder 1 to be loosened.

[0008] The beneficial effects of this invention are as follows: It adopts an integrated structure of broaching claw core, broaching claw plate, positioning retaining ring, guide ring and push rod. Each component is mutually constrained and matched, the number of parts is small, easy to process, and easy to assemble. The three-segment arc assembly has high positioning accuracy, fixed range of motion, small contact surface and is not easy to jam, and strong stability and reliability. The use of self-lubricating sleeve improves concentricity and reduces friction. Combined with the DLC coating of broaching claw core, broaching claw plate and guide ring, it is sturdy and durable, extends service life and is suitable for automatic tool changing. Attached Figure Description

[0009] Figure 1 This is a cross-sectional view of the overall structure of the spindle core of the present invention in the state of tool holder tension.

[0010] Figure 2 For the present invention Figure 1 A magnified schematic diagram of the structure at point A in the middle.

[0011] Figure 3 This is a cross-sectional view of the overall structure of the spindle core of the present invention in the state of the tool holder being released.

[0012] Figure 4 For the present invention Figure 3 A magnified schematic diagram of the structure at point A in the middle.

[0013] Attached Figure Labeling Explanation

[0014] 1-HSK tool holder; 2-spindle core; 3-puller pawl core; 4-puller pawl plate; 5-double-ended screw; 6-guide ring; 7-self-lubricating sleeve; 8-disc spring; 9-push rod; 10-positioning retaining ring; 11-O-ring A; 12-O-ring B; 13-sealing ring; Detailed Implementation

[0015] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings: Figure 1As shown, a broaching device for a high-speed, high-precision HSK spindle tool holder is characterized in that: the broaching device is located at the front section of the inner side of the spindle core 2, and includes a broaching claw core 3, a broaching claw plate 4, a double-ended screw 5, a guide ring 6, a push rod 9, and a positioning retaining ring 10. One end of the HSK tool holder 1 is inserted into the spindle core 2, and the broaching claw plate 4 is installed outside the broaching claw core 3. When the tool holder is tightened, the small inclined surface of the d portion of the broaching claw plate 4 is in contact with the small inclined surface of the front section of the outer contour of the broaching claw core 3, causing the broaching claw plate 4 to expand outward. The small inclined surface of the d portion of the broaching claw plate 4 amplifies the axial locking force provided by the disc spring 8 to provide a clamping force that meets the requirements of DIN 69893, thereby tightening the HSK tool holder 1.

[0016] like Figure 2 As shown, the broach claw 4 is installed and positioned between the spindle core and the broach claw core by mutual constraint of the three arc segments a, b, and c.

[0017] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the outer tail section of the puller claw 4 has a groove, in which a positioning ring 10 is installed. During the tightening and loosening of the tool handle, the small inclined surface of the d portion of the puller claw 4 remains in contact with the outer contour of the puller claw core 3 due to the elastic deformation of the positioning ring 10. The positioning ring 10 also serves to separate the multiple segments of the puller claw 4 to prevent them from contacting each other.

[0018] like Figure 3 and Figure 4 As shown, when the tool holder is loosened, the puller claw core 3 and the guide ring 6 are connected to the push rod 9 through the double-ended screw 5. The push rod 9 is pushed by an external electric cylinder, pneumatic cylinder or hydraulic cylinder, and the guide ring 6 is pushed down synchronously. When the tool holder is loosened, the curved surface of the guide ring 6f is inserted into the inner side of the puller claw 4, and is mutually constrained with the curved surface of the puller claw 4e. Even if the positioning ring 10 fails to deform elastically and gets stuck, the head of the puller claw 4 can be pried inward by using the arc surface of the puller claw 4a as a fulcrum. This ensures that the small inclined surface of the puller claw 4d is in contact with the inclined groove of the rear section of the puller claw core 3, allowing the gap required for the HSK tool holder 1 to loosen.

[0019] This invention designs an integrated structure consisting of a puller claw core 3, a puller claw plate 4, a double-ended screw 5, a guide ring 6, a push rod 9, and a positioning retaining ring 10. The puller claw core 3, the guide ring 6, and the push rod 9 are connected by the double-ended screw 5. O-rings A11 and B12 are provided at the connection point for sealing. This structure is suitable for applications involving center water spraying, center air blowing, or air suction.

[0020] The guide ring 6 not only ensures reliable positioning of the puller claw 4 when the tool is released, but also slides up and down within the self-lubricating sleeve 7, guaranteeing concentricity, service life, and ease of maintenance. In some applications, the guide ring 6 is coated with a wear-resistant layer, and the self-lubricating sleeve 7 can be replaced with an integrated spindle core structure, simplifying the overall structure.

[0021] The push rod 9 is equipped with a sealing ring 13, which can simultaneously seal against dust and improve the concentricity of the integrated structure during the loosening and pulling of the tool holder. The push rod 9 and the double-ended screw 5 can be integrated as one piece, or the double-ended screw 5 and the guide ring 6 can be integrated as one piece, thereby simplifying the overall structure.

[0022] The above description is merely a preferred embodiment of the present invention and does not limit the scope of protection thereto. Any changes and modifications made based on the technical essence of the present invention without creative effort shall still fall within the protection scope of the present invention.

Claims

1. A broaching device for a high-speed, high-precision HSK spindle tool holder, characterized in that: The broaching device is located at the front end of the inner side of the spindle core (2), including a broaching claw core (3), a broaching claw plate (4), a double-ended screw (5), a guide ring (6), a push rod (9), and a positioning ring (10). One end of the HSK tool holder (1) is inserted into the spindle core (2), and the broaching claw plate (4) is installed outside the broaching claw core (3). The broaching claw plate (4) is installed and positioned between the spindle core and the broaching claw core by mutual constraint of the three arc segments a, b, and c of the outer shape. When the tool holder is tightened, the small inclined surface of the d part of the broaching claw plate (4) fits against the small inclined surface of the front part of the outer contour of the broaching claw core (3), causing the broaching claw plate (4) to expand outward. The small inclined surface of the d part of the broaching claw plate (4) amplifies the axial locking force provided by the disc spring (8) to provide a clamping force that meets the requirements of DIN 69893. When the tool holder is loosened, the puller claw core (3) and the guide ring (6) are connected to the push rod (9) through the double-ended screw (5). The push rod (9) is pushed by an external electric cylinder, pneumatic cylinder or hydraulic cylinder, and the guide ring (6) is pushed down synchronously. When the tool holder is loosened, the curved surface of the guide ring (6) f part is inserted into the inside of the puller claw (4) and is mutually constrained with the curved surface of the puller claw (4) e part. When the positioning ring (10) fails to deform elastically and gets stuck, the head of the puller claw (4) is pried inward by the arc surface of the puller claw (4) a part as a fulcrum, so that the small inclined surface of the puller claw (4) d part fits into the inclined groove of the rear section of the puller claw core (3), so as to make room for the gap required for the HSK tool holder (1) to loosen the tool holder; The positioning retaining ring (10) is configured to keep the small inclined surface of the d part of the broach claw (4) in contact with the outer contour of the broach claw core (3) by the elastic deformation of the positioning retaining ring (10) during the tightening and loosening of the tool holder.

2. The broaching device for a high-speed, high-precision HSK tool holder according to claim 1, characterized in that: The outer tail section of the puller claw (4) is provided with a groove, and the positioning ring (10) is installed in the groove. The positioning ring (10) can also separate the multiple puller claws (4) from each other. The double-ended screw (5) connects the cutter claw core (3), the guide ring (6) and the push rod (9), and O-ring A (11) and O-ring B (12) are set at the connection to seal the application of center water spraying or center air blowing and suction.

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