A center C axis indexing positioning device for turning

Abstract

This invention proposes a C-axis indexing and positioning device for a turning center, comprising: a pulley, a spindle connected to the pulley, and a spindle box disposed on the outside of the spindle; it also includes a hydraulic brake disposed on the surface of the spindle box, a brake disc disposed on the surface of the pulley and cooperating with the hydraulic brake, and an angle encoder for recording the rotation angle of the pulley disposed on the surface of the spindle box. The hydraulic brake is clamped to the pulley by a hydraulic valve group, thereby optimizing the indexing and positioning process of the C-axis of the turning center. The introduction of damping state significantly improves the motion characteristics of the belt-driven C-axis at low speeds and during indexing and positioning, reduces vibration and positioning overshoot, and improves positioning accuracy and surface finish. The high-pressure locking state ensures sufficient rigidity during non-turning machining. The entire system has a compact structure and achieves stepless or dual-stage precise control of braking force through an electro-hydraulic valve group, with fast response speed, high degree of automation, and good reliability.

Description

Technical Field

[0001] This utility model relates to the field of turning center spindles, and in particular to a turning center C-axis indexing and positioning device. Background Technology

[0002] The turning center spindle is a multi-functional, high-performance power and positioning unit that integrates high-precision rotation, indexing positioning, and axial servo feed functions.

[0003] Current turning center spindles use electric spindles. Due to limitations in size and heat dissipation capacity, electric spindles typically have lower maximum output power and torque, especially at low speeds, than traditional gear or belt-driven spindles of the same size. Electric spindles also have higher manufacturing and maintenance costs than traditional spindles. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of the existing technology. This utility model proposes a C-axis indexing and positioning device for turning centers.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a C-axis indexing and positioning device for a turning center, comprising: a pulley, a spindle connected to the pulley, and a spindle box disposed on the outside of the spindle; It also includes a hydraulic brake mounted on the surface of the spindle box, a brake disc mounted on the surface of the pulley and fitted with the hydraulic brake, an angle encoder on the surface of the spindle box for recording the rotation angle of the pulley, and a hydraulic valve assembly connected to the hydraulic brake as the power source of the hydraulic brake. When the belt drives the pulley to rotate, the pulley drives the spindle to rotate relative to the spindle box. The hydraulic valve assembly controls the clamping force of the hydraulic brake on the brake disc and controls the damping of the pulley during rotation.

[0006] Preferably, the surface of the spindle box is provided with a protective cover to shield the angle encoder.

[0007] Preferably, the surface of the spindle box is provided with a mounting bracket for mounting a hydraulic brake.

[0008] Preferably, the surface of the spindle box is provided with a mounting sleeve for mounting an angle encoder.

[0009] Preferably, the hydraulic valve group includes a distributor plate, a stacked electrically controlled pressure reducing valve, a pressure relay, a pressure relay, and a solenoid directional valve.

[0010] Preferably, the superimposed electronically controlled pressure reducing valve is used to set the high pressure value and low pressure value of braking. When the high pressure is selected, the brake disc can be fully braked, and when the low pressure is selected, the brake disc is in a damped state.

[0011] Preferably, the pressure relay and the pressure relay are used to detect the high and low pressure of the brake hydraulic circuit, respectively.

[0012] Preferably, the electromagnetic reversing valve controls the oil inlet and outlet of the hydraulic brake to achieve braking and release of the hydraulic brake.

[0013] Compared with the prior art, the beneficial effects of this utility model include: the hydraulic valve group controls the hydraulic brake to clamp the pulley, thereby optimizing the indexing and positioning process of the C-axis of the turning center; the introduction of damping state significantly improves the motion characteristics of the belt-driven C-axis at low speed and during indexing and positioning, reduces vibration and positioning overshoot, and improves positioning accuracy and surface finish; the high-pressure locking state ensures sufficient rigidity during non-turning machining; the entire system has a compact structure; and the stepless or dual-stage precise control of braking force is achieved through the electro-hydraulic valve group, resulting in fast response, high automation, and good reliability. Attached Figure Description

[0014] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein: Figure 1 The schematic diagram shows the structure of a turning center C-axis indexing and positioning device according to one embodiment of the present invention.

[0015] Figure 2 The schematic diagram shows a side view of the positioning device according to one embodiment of the present invention.

[0016] Figure 3 The schematic diagram shows a hydraulic valve assembly structure according to one embodiment of the present invention.

[0017] The following are the labels in the diagram: 1. Pulley; 2. Angle encoder; 3. Hydraulic brake; 4. Protective cover; 5. Mounting bracket; 6. Brake disc; 7. Mounting sleeve; 8. Pressure relay; 9. Pressure relay; 10. Solenoid directional valve; 11. Stacked electronic pressure reducing valve; 12. Oil distributor plate; 13. Spindle box; 14. Spindle; Detailed Implementation

[0018] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0020] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0021] Example 1 According to one embodiment of the present invention, in conjunction with Figures 1-3 As shown, the present invention provides a C-axis indexing and positioning device for a turning center, the core of which is to achieve precise damping control and angle positioning during the C-axis indexing rotation process through an integrated hydraulic braking system and angle feedback system.

[0022] The main structure of the device includes a pulley 1 that serves as the power input and rotation base. The pulley 1 is fixedly connected to or integrally formed with a spindle 14. The spindle 14 is used to carry and transmit the core rotational motion of the C-axis. The spindle 14 is coaxially fitted inside a fixed spindle box 13. The spindle box 13 is fixedly installed on the bed of the turning center to provide support for the entire device.

[0023] A hydraulic brake 3 is installed on the outer surface of the spindle box 13. Specifically, the hydraulic brake 3 can be firmly fixed to a predetermined position in the spindle box 13 by a mounting bracket 5. Corresponding to the brake pads of the hydraulic brake 3, a brake disc 6 is fixedly installed on the end face or outer circumferential surface of the pulley 1. The brake disc 6 rotates synchronously with the pulley 1. When pressurized oil is introduced into the hydraulic brake 3, its brake pads will clamp the brake disc 6 to generate braking torque.

[0024] In order to achieve accurate angle monitoring, an angle encoder 2 is also installed on the spindle box 13 to detect and record the absolute or relative rotation angle of the pulley 1 in real time. In order to protect the angle encoder 2 from contamination by chips, coolant, etc., a protective cover 4 is also installed on the spindle box 13 to cover it.

[0025] The hydraulic valve assembly provides controllable hydraulic power to the hydraulic brake 3. This valve assembly is connected to the cylinder of the hydraulic brake 3 via pipeline.

[0026] The hydraulic valve assembly is key to controlling the braking state. Its preferred embodiment includes an integrated oil distribution plate 12, and a stacked electronically controlled pressure reducing valve 11, a first pressure relay 8, a second pressure relay 9 and a solenoid directional valve 10 mounted on the oil distribution plate 12.

[0027] The stacked electronic pressure reducing valve 11 is used to set two different output pressure values—a high pressure setting value and a low pressure setting value—which are set by two knobs on the stacked electronic pressure reducing valve 11.

[0028] This pressure value enables the hydraulic brake 3 to generate sufficient clamping force to completely brake the brake disc 6, preventing the pulley 1 from rotating and achieving rigid positioning and locking of the C-axis, which is used for non-turning machining such as milling and drilling.

[0029] The low pressure setting value causes the hydraulic brake 3 to generate a controllable, small clamping force on the brake disc 6. At this time, the brake disc 6 is not completely locked, but is in a damped state. The pulley 1 can rotate under the drive of the motor to overcome this damping force. However, the damping force can effectively suppress the vibration, creep or response lag caused by the poor rigidity of the belt drive, and improve the smoothness and dynamic response accuracy of the C-axis during the indexing rotation process.

[0030] The first pressure relay 8 and the second pressure relay 9 are connected in parallel in the oil circuit leading to the hydraulic brake 3, or monitor the high and low pressure circuits respectively. They are used to detect in real time whether the actual pressure of the hydraulic circuit has reached the preset high pressure value or low pressure value, and feed the detection signal back to the control system as a signal to confirm the braking status, so as to ensure safe and reliable control.

[0031] The electromagnetic reversing valve 10 is responsible for controlling the opening and closing of the oil circuit and the flow direction. When braking is required, the electromagnetic reversing valve 10 is energized and switches to the oil inlet position, introducing the set pressure oil from the superimposed electronic pressure reducing valve 11 into the cylinder of the hydraulic brake 3, pushing the brake pads to move. When it is necessary to release the brake and allow the C-axis to rotate completely freely, the electromagnetic reversing valve 10 is de-energized and resets to the oil discharge position. The pressure oil in the cylinder of the hydraulic brake 3 flows back to the oil tank, and the brake pads release the brake disc 6 under the action of the spring.

[0032] During the working cycle of the turning center, the device works in the following manner: C-axis indexing rotation stage: When the C-axis needs to rotate to a certain target angle, the spindle servo motor drives the pulley 1 to rotate via the belt. At this time, the control solenoid directional valve 10 is energized, and the superimposed electronic pressure reducing valve 11 outputs low pressure. The hydraulic brake 3 clamps the brake disc 6 with a small force to provide damping. Under this damping state, the C-axis rotates smoothly and without vibration. The angle encoder 2 provides real-time feedback on the position. Before reaching the target angle, the control system issues deceleration and positioning commands in advance.

[0033] C-axis positioning and locking stage: When the angle encoder 2 detects that the C-axis has reached the target angle, the control system immediately switches the superimposed electronic pressure reducing valve 11 to high pressure output, and the hydraulic brake 3 quickly locks the brake disc 6 with the maximum clamping force to firmly fix the C-axis. The pressure relay 8 sends a signal to confirm that the locking is completed. Subsequently, the machine tool can perform secondary processing such as milling and drilling.

[0034] C-axis release stage: When the C-axis needs to resume continuous rotation for turning, the control system de-energizes the solenoid directional valve 10 to release oil, the hydraulic brake 3 fully releases the brake disc 6, and the C-axis resumes free rotation.

[0035] Through the above specific implementation methods, the present invention optimizes the indexing and positioning process of the C-axis of the turning center. The introduction of damping state significantly improves the motion characteristics of the belt-driven C-axis at low speeds and during indexing and positioning, reduces vibration and positioning overshoot, and improves positioning accuracy and surface finish. The high-pressure locking state ensures sufficient rigidity during non-turning machining. The entire system has a compact structure and achieves stepless or dual-stage precise control of braking force through electro-hydraulic valve groups. It has a fast response speed, high degree of automation, and good reliability.

[0036] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0037] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A C-axis indexing and positioning device for a turning center, characterized in that, include: A pulley, a spindle connected to the pulley, and a spindle box located on the outside of the spindle; It also includes a hydraulic brake mounted on the surface of the spindle box, a brake disc mounted on the surface of the pulley and fitted with the hydraulic brake, an angle encoder on the surface of the spindle box for recording the rotation angle of the pulley, and a hydraulic valve assembly connected to the hydraulic brake as the power source of the hydraulic brake. When the belt drives the pulley to rotate, the pulley drives the spindle to rotate relative to the spindle box. The hydraulic valve assembly controls the clamping force of the hydraulic brake on the brake disc and controls the damping of the pulley during rotation.

2. The C-axis indexing and positioning device for a turning center according to claim 1, characterized in that, The surface of the spindle box is equipped with a protective cover to shield the angle encoder.

3. The C-axis indexing and positioning device for a turning center according to claim 1, characterized in that, The surface of the spindle box is provided with a mounting bracket for installing a hydraulic brake.

4. The C-axis indexing and positioning device for a turning center according to claim 1, characterized in that, The surface of the spindle box is provided with a mounting sleeve for mounting an angle encoder.

5. The C-axis indexing and positioning device for a turning center according to claim 1, characterized in that, The hydraulic valve group includes a distributor plate, a stacked electrically controlled pressure reducing valve, a pressure relay, and a solenoid directional valve.

6. The C-axis indexing and positioning device for a turning center according to claim 5, characterized in that, The superimposed electronically controlled pressure reducing valve is used to set the high pressure value and low pressure value of braking. When the high pressure is selected, the brake disc can be fully braked, and when the low pressure is selected, the brake disc is in a damped state.

7. The C-axis indexing and positioning device for a turning center according to claim 6, characterized in that, The pressure relay and pressure relay are used to detect the high and low pressure of the brake hydraulic circuit, respectively.

8. The C-axis indexing and positioning device for a turning center according to claim 7, characterized in that, The electromagnetic reversing valve controls the oil inlet and outlet of the hydraulic brake to achieve braking and release of the hydraulic brake.

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