Machine tool spindle clamp torque testing fixture structure

Abstract

This utility model discloses a machine tool spindle clamp torque testing fixture structure, including a base, a brake disc, a positioning shaft, and a machine tool clamp to be tested. A rotating cylinder is rotatably connected to the outer side of the positioning shaft via a bearing. A torque disc is disposed outside the brake disc, and the torque disc and brake disc are axially fixed to the outer end face of the rotating cylinder by a first fastener. When the brake clamp is in operation without air pressure input, the brake disc can be easily rotated by hand. After air pressure is input, the brake clamp clamps the brake disc, which cannot be rotated by hand. By inserting a torque wrench into the inner hole of the torque disc and rotating the wrench, the torque value of the brake disc during rotation can be read. By comparing this torque value with the customer's required torque value, the clamp's qualification can be determined. The braking torque of the brake clamp can be directly tested, preventing defective products from reaching customers and avoiding the scrapping of parts due to insufficient braking torque.

Description

Technical Field

[0001] This utility model belongs to the technical field of testing tooling, specifically relating to the structure of a machine tool spindle clamp torque testing tooling. Background Technology

[0002] The machine tool spindle brake chuck is the actuator for braking the machine tool spindle. Its braking torque must be adequate to ensure rapid braking of the machine tool spindle and prevent dimensional deviations during part machining. The performance stability of the machine tool spindle brake chuck directly affects the stability of machine tool machining performance. Typically, to save machine tool space, the machine tool brake chuck is designed with a compact structure, with the gap between the two brake pads only a few millimeters. The clamping force can only be detected by an ultra-thin load cell. The braking of the machine tool spindle relies on the braking torque of the chuck, which is calculated as clamping force × coefficient of friction × braking radius, where the braking radius is a fixed value. Measuring only the clamping force, if the coefficient of friction is not up to standard, will also lead to insufficient braking torque, affecting the precise braking of the machine tool spindle and even causing the workpiece to be scrapped. Load cells are expensive, resulting in high testing costs. Furthermore, the protruding part of the load cell directly contacts the friction pads of the chuck, which may damage the friction pads.

[0003] Therefore, the existing machine tool brake clamp inspection fixture has the following disadvantages:

[0004] 1. The inability to directly detect braking torque leads to products with unqualified friction coefficients entering the hands of customers after the clamping force is qualified. This affects the spindle braking, causing the spindle to fail to brake in time during the processing, resulting in the scrapping of the workpiece.

[0005] 2. The high technical requirements of ultra-thin weighing sensors increase procurement costs, resulting in high testing costs;

[0006] 3. The protruding part of the weighing sensor is in direct contact with the clamp friction plate, which may damage the friction plate. Utility Model Content

[0007] The purpose of this invention is to provide a tooling structure for detecting the torque of a machine tool spindle clamp, in order to solve the problems mentioned in the background art, such as the inability to directly detect braking torque, high detection costs, and the risk of damaging the friction plates.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a machine tool spindle clamp torque detection fixture structure, including a base, a brake disc, a positioning shaft, and a machine tool clamp to be tested. A rotating cylinder is rotatably connected to the outer side of the positioning shaft via a bearing. A torque disc is provided outside the brake disc. The torque disc and the brake disc are axially fixed to the outer end face of the rotating cylinder by a first fastener. A retaining ring for axial positioning of the rotating cylinder is provided between the torque disc and the rotating cylinder. The positioning shaft is fixed to the base by a second fastener. The machine tool clamp to be tested is located on one side of the brake disc. The machine tool clamp to be tested is fixed to the base by a third fastener. A torque wrench for detecting the rotation torque of the brake disc by twisting the torque disc is provided outside the positioning shaft.

[0009] Preferably, the bearing is installed in the inner hole of the rotating drum, and the retaining ring is pressed against the inner ring of the bearing by the pressure of the torque disc.

[0010] Preferably, the first fastener consists of four first screws, which are arranged in a cross shape, passing through the torque disc and brake disc and threaded onto the rotating drum.

[0011] Preferably, the second fastener consists of two second screws, which are centrally symmetrically arranged through the base and threadedly connected to the positioning shaft.

[0012] Preferably, the third fastener is two third screws, which are symmetrically distributed along the central axis of the base and the brake disc, and the two third screws pass through the base and are threadedly connected to the clamp of the machine tool under test.

[0013] Preferably, the torque disc has a hole at its center that is compatible with a torque wrench.

[0014] Preferably, the end face of the torque disc is provided with a radially outward-facing indicator needle.

[0015] Preferably, the brake disc has annularly distributed scale lines on its end face.

[0016] Compared with the prior art, this utility model provides a tooling structure for detecting the torque of a machine tool spindle clamp, which has the following advantages:

[0017] 1. When the brake caliper of this utility model is used without air pressure input, the brake disc can be easily rotated by hand. After air pressure is input, the brake caliper under test clamps the brake disc, and the brake disc cannot be rotated by hand. By inserting a torque wrench into the inner hole of the torque disc, the torque value when the brake disc rotates can be read. By comparing it with the torque value required by the customer, it can be determined whether the caliper is qualified. The braking torque of the brake caliper can be directly tested. Defective products will not enter the hands of customers, avoiding the situation where parts are scrapped due to insufficient braking torque and failure to brake in time.

[0018] 2. This utility model does not use a weighing sensor during the entire process of braking detection of the clamp of the machine tool under test, thus reducing costs;

[0019] 3. During testing, this utility model reduces wear on the friction pads because the brake disc end face is clamped in the middle of the machine tool clamping friction pads. The machine tool spindle clamp torque testing fixture structure proposed in this utility model simplifies the testing process and reduces the risk of damaging the friction pads. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0021] Figure 1 This is a front view structural diagram of the machine tool spindle clamp torque detection fixture proposed in this utility model;

[0022] Figure 2 This is a top view schematic diagram of the machine tool spindle clamp torque detection fixture proposed in this utility model;

[0023] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure along the AA direction;

[0024] In the diagram: 1. Torque disc; 2. Base; 3. First screw; 4. Brake disc; 5. Bearing; 6. Positioning shaft; 7. Second screw; 8. Retaining ring; 9. Rotary drum; 10. Third screw; 11. Clamp of the machine tool under test; 12. Torque wrench; 13. Scale line; 14. Indicator needle. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figures 1-3This utility model provides a technical solution: a machine tool spindle clamp torque detection fixture structure, including a base 2, a brake disc 4, a positioning shaft 6, and a machine tool clamp 11 to be tested. A rotating cylinder 9 is rotatably connected to the outer side of the positioning shaft 6 via a bearing 5. A torque disc 1 is disposed outside the brake disc 4. The torque disc 1 and the brake disc 4 are axially fixed to the outer end face of the rotating cylinder 9 by a first fastener. A retaining ring 8 for axial positioning of the rotating cylinder 9 is disposed between the torque disc 1 and the rotating cylinder 9. The positioning shaft 6 is fixed to the base 2 by a second fastener. The machine tool clamp 11 to be tested is located on one side of the brake disc 4. The machine tool clamp 11 is fixed to the base 2 by a third fastener. A torque wrench 12 is provided outside the positioning shaft 6 to detect the rotation torque of the brake disc 4 by twisting the torque plate 1. The torque is directly applied to the torque plate 1 through the torque wrench 12. The brake disc 4 is fixedly connected to the torque plate 1 and rotates together. When the clamp 11 clamps the brake disc 4, the minimum torque required to start it rotating is measured. This torque value is the actual braking torque of the clamp. By combining the mechanical transmission and torque measurement of the above structure, the direct detection of the braking torque of the machine tool spindle clamp is realized.

[0027] Furthermore, the bearing 5 is installed in the inner hole of the rotating cylinder 9, and the retaining ring 8 is pressed against the inner ring of the bearing 5 by the pressure of the torque disc 1 to achieve axial positioning of the bearing 5.

[0028] Furthermore, the first fastener consists of four first screws 3, which are arranged in a cross shape and pass through the torque disc 1 and brake disc 4, and are threaded to the rotating drum 9; the second fastener consists of two second screws 7, which are centrally symmetrical and pass through the base 2, and are threaded to the positioning shaft 6; the third fastener consists of two third screws 10, which are symmetrically distributed along the central axis of the base 2 and brake disc 4, pass through the base 2, and are threaded to the clamp 11 of the machine tool under test. The torque disc 1, brake disc 4, and rotating drum 9 are fixed together by the first screws 3, the base 2 and positioning shaft 6 are fixed together by the second screws 7, and the base 2 and clamp 11 of the machine tool under test are fixed together by the third screws 10. The structure is simple and reliable.

[0029] Furthermore, the torque plate 1 has a hole at its center that is compatible with the torque wrench 12. Using a conventional torque wrench 12 as a measuring tool, the transmission system is constructed through standard mechanical components such as the rotary drum 9 and the bearing 5, which greatly reduces the testing cost and avoids the risk of damage that may be caused by the contact between the weighing sensor and the friction plate.

[0030] Furthermore, the torque disc 1 has a radially outward-facing indicator needle 14 on its end face, and the brake disc 4 has annularly distributed scale lines 13 on its end face. The rotation angle is determined by observing the displacement of the indicator needle 14 relative to the scale lines 13, and the accurate torque value is obtained by combining the reading of the torque wrench 12.

[0031] The working principle and usage process of this utility model are as follows: When there is no air pressure input to the machine tool clamp 11 under test, the brake disc 4 can be easily rotated by hand. After air pressure is input, the machine tool clamp 11 under test clamps the brake disc 4, and the brake disc 4 cannot be rotated by hand. Insert the torque wrench 12 into the inner hole of the torque disc 1. At this time, rotate the torque wrench 12. By measuring the difference between the value of the indicator needle 14 on the end face of the torque disc 1 pointing to the scale line 13 on the end face of the brake disc 4 before and after rotation and the initial value, the torque value when the brake disc 4 rotates can be read. By comparing it with the torque value required by the customer, it can be determined whether the machine tool clamp 11 under test is qualified. Since the friction plate of the machine tool clamp 11 under test clamps the end face of the brake disc 4 in the middle, the wear on the friction plate is reduced. The machine tool spindle clamp torque detection fixture structure proposed in this utility model simplifies the detection process and reduces the risk of damaging the friction plate.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tool structure for detecting the torque of a machine tool chuck, comprising a base (2), a brake disc (4), a positioning shaft (6), and a machine tool chuck (11) to be detected, characterized in that: The outer side of the positioning shaft (6) is rotatably connected to the rotating drum (9) via the bearing (5). A torque disc (1) is provided outside the brake disc (4). The torque disc (1) and the brake disc (4) are axially fixed to the outer end face of the rotating drum (9) by the first fastener. A retaining ring (8) for axial positioning of the rotating drum (9) is provided between the torque disc (1) and the rotating drum (9). The positioning shaft (6) is fixed to the base (2) by the second fastener. The machine tool clamp (11) under test is located on one side of the brake disc (4). The machine tool clamp (11) under test is fixed to the base (2) by the third fastener. A torque wrench (12) is provided outside the positioning shaft (6) to detect the rotation torque of the brake disc (4) by twisting the torque disc (1).

2. The machine tool spindle chuck force moment detection tooling structure of claim 1, wherein: The bearing (5) is installed in the inner hole of the rotating drum (9), and the retaining ring (8) is pressed against the inner ring of the bearing (5) by the pressure of the torque disc (1).

3. The machine tool spindle chuck force moment detection tooling structure of claim 1, wherein: The first fastener consists of four first screws (3), which are arranged in a cross shape and pass through the torque disc (1) and brake disc (4) and are threaded to the rotating drum (9).

4. The machine tool spindle chuck force moment detection tooling structure of claim 1, wherein: The second fastener consists of two second screws (7), which are centrally symmetrically arranged through the base (2) and threadedly connected to the positioning shaft (6).

5. The machine tool spindle clamp torque detection fixture structure according to claim 1, characterized in that: The third fastener consists of two third screws (10). The two third screws (10) are symmetrically distributed along the central axis of the base (2) and the brake disc (4). The two third screws (10) pass through the base (2) and are threadedly connected to the clamp (11) of the machine tool under test.

6. The machine tool spindle chuck force moment detection tooling structure of claim 1, wherein: The torque plate (1) has a hole at its center that is compatible with the torque wrench (12).

7. The machine tool spindle chuck force moment detection tooling structure of claim 1, wherein: The torque disc (1) has a radially outward-facing indicator needle (14) on its end face.

8. The machine tool spindle chuck force moment detection tooling structure of claim 7, wherein: The brake disc (4) has annularly distributed scale lines (13) on its end face.

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