Universal tool for two-sided accurate grinding machine of brake disc

Abstract

The utility model provides a universal tool for a brake disc double-face accurate grinding machine, and relates to the technical field of brake disc machining. The universal tool for the brake disc double-face accurate grinding machine comprises a main tool body and a replaceable module, a stepped groove is formed in the surface of the main tool body, the stepped groove is composed of two annular steps with different diameters, a kidney-shaped hole is formed in the radial surface of the main tool body, a movable positioning pin is installed in the kidney-shaped hole, and the replaceable module is arranged in the kidney-shaped hole. The diameter of the positioning pin is smaller than the minimum installation hole diameter of a brake disc to be machined, the replaceable module is fixed to the stepped groove of the main tool through a threaded connecting piece, and the inner diameter of the replaceable module is matched with the size of an installation hole of the brake disc. According to the universal tool for the brake disc double-face accurate grinding machine, the stepped groove in the surface of the main body tool is designed into the multi-stage annular steps, the replaceable module is rapidly installed through the bolts, the inner diameter of the replaceable module is accurately matched with a brake disc installation hole, the universal tool can be matched with brake discs with different inner diameters, and the universality is remarkably improved.

Description

Technical Field

[0001] This application relates to the field of brake disc processing technology, specifically to a universal tooling for a double-sided precision grinding machine for brake discs. Background Technology

[0002] In the field of double-sided precision grinding of brake discs, traditional tooling requires custom-made fixtures for different brake disc models. Due to differences in the inner diameter and mounting hole dimensions of the brake disc (typically within a tolerance range of ±15mm), tooling must be redesigned and manufactured for each new model, leading to the following problems:

[0003] High development costs: The design, processing, and debugging of specialized tooling have long cycles and high costs per set;

[0004] Poor adaptability: Existing tooling relies on fixed-size positioning pins and mounting holes, which cannot be flexibly adjusted and can only be adapted to a single model;

[0005] Inefficiency: Frequent tooling changes lead to increased downtime, especially in small-batch, multi-variety production.

[0006] While existing technologies attempt to improve versatility through modular design, they have failed to effectively resolve the contradiction between positioning accuracy and rapid adjustment. Therefore, there is an urgent need for a universal tooling solution that combines high adaptability, low cost, and high precision. Utility Model Content

[0007] (a) Technical problems to be solved

[0008] To address the shortcomings of existing technologies, this application provides a universal tooling for a double-sided precision grinding machine for brake discs, which solves the problems mentioned in the background section.

[0009] (II) Technical Solution

[0010] To achieve the above objectives, this application provides the following technical solution: a universal tooling for a double-sided precision grinding machine for brake discs, comprising a main tooling and a replaceable module. The main tooling has a stepped groove on its surface, which is composed of two annular steps of different diameters. The radial surface of the main tooling has an oblong hole, in which a movable positioning pin is installed. The diameter of the positioning pin is smaller than the minimum mounting hole diameter of the brake disc to be processed. The replaceable module is fixed to the stepped groove of the main tooling via a threaded connector, and the inner diameter of the replaceable module matches the mounting hole size of the brake disc.

[0011] By adopting the above technical solution, the inner diameter of the replaceable module is customized according to the mounting hole of the brake disc, and the outer diameter matches the stepped groove. When the inner diameter of the brake disc falls into the corresponding step range, the step sidewall provides radial positioning. After being tightened by bolts, a rigid connection is formed to ensure that there is no loosening during processing and to avoid eccentricity.

[0012] Preferably, the total length of the waist-shaped hole is 23mm, the axial adjustment tolerance is ±0.1mm, and the positioning pin is fixed at any position in the waist-shaped hole by a locking nut.

[0013] By adopting the above technical solution, the waist-shaped hole is formed by wire cutting, and its axis is aligned with the axis of the brake disc mounting hole, eliminating the positioning deviation caused by the difference in hole diameter.

[0014] Preferably, the diameter of the locating pin is 1-3 mm smaller than the minimum mounting hole diameter of the brake disc.

[0015] By adopting the above technical solution, the diameter of the positioning pin is smaller than the minimum mounting hole of the brake disc. Loosen the locking nut and slide the positioning pin along the waist-shaped hole to the target position.

[0016] Preferably, the bottom of the stepped groove is provided with a first threaded slot, and the end face of the replaceable module is provided with a corresponding mounting through hole.

[0017] By adopting the above technical solution, the mounting through hole and the first threaded slot hole are connected by an M8 bolt.

[0018] Preferably, the main tooling has four fixed through holes arranged in a circular array on its circumferential edge for fixing to the grinding machine table by T-bolts.

[0019] By adopting the above technical solution, the four fixed through holes are distributed in a 90° circle.

[0020] Preferably, the replaceable module has a second threaded slot at its center for installing an auxiliary positioning pin or a counterweight.

[0021] By adopting the above technical solution, the second threaded slot is located at the center of the replaceable module. After the counterweight is installed in the second threaded slot, the centrifugal force generated by asymmetrical processing is balanced, the vibration of the grinding machine spindle is reduced, and the surface finish is improved.

[0022] (III) Beneficial Effects

[0023] This application provides a universal tooling fixture for a double-sided precision grinding machine for brake discs. It offers the following advantages:

[0024] 1. This universal tooling for double-sided precision grinding of brake discs features a stepped groove design on the main tooling surface, which is transformed into multi-level annular steps. Replaceable modules can be quickly installed via bolts, and their inner diameter precisely matches the mounting holes of the brake discs. Only the modules need to be replaced to adapt to different hole diameters and brake discs with different inner diameters. With the addition of waist-shaped holes and positioning pins, the positioning pins can be adjusted axially, and their axis is aligned with the axis of the brake disc mounting holes, eliminating positioning deviations caused by differences in hole diameters and significantly improving versatility.

[0025] 2. This brake disc double-sided precision grinding machine universal tooling, one main tooling can be adapted to multiple specifications of brake discs, which greatly reduces the number of special tooling, significantly shortens the tooling change time, supports rapid changeover production, and the fixed through hole is quickly locked to the grinding machine worktable by T-bolts, improving clamping efficiency. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a three-dimensional structural diagram of the present application;

[0028] Figure 2 This is a three-dimensional structural diagram of the separated state of this application;

[0029] Figure 3 This is a three-dimensional structural diagram of the main tooling of this application;

[0030] Figure 4 This is a three-dimensional structural diagram of the replaceable module of this application.

[0031] In the diagram: 1. Main fixture; 11. Stepped groove; 12. Waist-shaped hole; 13. First threaded slot; 14. Fixing through hole; 2. Replaceable module; 21. Mounting through hole; 22. Second threaded slot; 3. Positioning pin. Detailed Implementation

[0032] The present application will be further described in detail below with reference to the accompanying drawings and embodiments.

[0033] Reference Figures 1 to 4This application provides a universal tooling for a double-sided precision grinding machine for brake discs, including a main tooling 1 and a replaceable module 2. The main tooling 1 has a stepped groove 11 on its surface, which consists of two levels of annular steps of different diameters. The main tooling 1 is made of 45# steel forging blank, and the stepped groove 11 is machined by a CNC lathe. The surface is hardened to a hardness of HRC50-55. The stepped groove 11 structure can adapt to brake discs of different inner diameters. A waist-shaped hole 12 is formed on the radial surface of the main tooling 1, and a movable positioning pin 3 is installed inside the waist-shaped hole 12. The diameter of the positioning pin 3 is smaller than the minimum mounting hole diameter of the brake disc to be processed. The design of the waist-shaped hole 12 allows the positioning pin 3 to be adjusted along the axial direction. The replaceable module 2 is fixed to the stepped groove 11 of the main fixture 1 through a threaded connector. The inner diameter of the replaceable module 2 matches the mounting hole size of the brake disc. The inner diameter of the replaceable module 2 is customized according to the mounting hole of the brake disc, and the outer diameter matches the stepped groove 11. When the inner diameter of the brake disc falls into the corresponding step range, the step sidewall provides radial positioning. After being tightened by bolts, a rigid connection is formed to ensure that there is no loosening during processing and to avoid eccentricity.

[0034] In one aspect of this embodiment, the total length of the oblong hole 12 is 23mm. The positioning pin 3 is fixed at any position of the oblong hole 12 by a locking nut. The oblong hole 12 is formed by wire cutting, and its axis is aligned with the axis of the brake disc mounting hole to eliminate positioning deviation caused by the difference in hole diameter.

[0035] In one aspect of this embodiment, the diameter of the locating pin 3 is 1-3 mm smaller than the minimum mounting hole diameter of the brake disc. The locating pin 3 is made of GCr15 bearing steel with nitriding treatment on the surface. Its diameter is smaller than the minimum mounting hole diameter of the brake disc. Loosen the locking nut and slide the locating pin 3 along the waist-shaped hole 12 to the target position. After locking, the radial runout is tested to be ≤0.05 mm.

[0036] In one aspect of this embodiment, the bottom of the stepped groove 11 is provided with a first threaded slot 13, and the end face of the replaceable module 2 is provided with a mounting through hole 21 at the corresponding position. The mounting through hole 21 and the first threaded slot 13 are connected by an M8 bolt with a torque set to 25 N·m.

[0037] In one aspect of this embodiment, the circumferential edge of the main tooling 1 is provided with four fixing through holes 14 arranged in a circular array for fixing to the grinding machine table by T-bolts. The four fixing through holes 14 with a diameter of 12mm are arranged in a 90° circular array.

[0038] In one aspect of this embodiment, the replaceable module 2 has a second threaded slot 22 at its center for installing an auxiliary positioning pin or a counterweight. The second threaded slot 22 is located at the center of the replaceable module 2. After the counterweight is installed in the second threaded slot 22, it balances the centrifugal force generated by asymmetric machining, reduces the vibration of the grinding machine spindle, and improves the surface finish.

[0039] Working principle: This brake disc double-sided precision grinding machine universal tooling is installed on the grinding machine worktable through the fixed through hole 14. Select the replaceable module 2 with an inner diameter of Φ50mm and match it with the Φ215mm step of the stepped groove 11. Fix it with M8 bolts. Adjust the positioning pin 3 to the front end of the waist-shaped hole 12. After locking, clamp the Φ210mm brake disc. After processing, replace the module with an inner diameter of Φ65mm and adjust the positioning pin 3 to the end of the waist-shaped hole 12 to fit the Φ225mm brake disc.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0041] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A universal tooling for a double-sided precision grinding machine for brake discs, comprising a main tooling (1) and a replaceable module (2), characterized in that: The surface of the main fixture (1) is provided with a stepped groove (11), which is composed of two annular steps of different diameters. The radial surface of the main fixture (1) is provided with a waist-shaped hole (12), and a movable positioning pin (3) is installed in the waist-shaped hole (12). The diameter of the positioning pin (3) is smaller than the minimum mounting hole diameter of the brake disc to be processed. The replaceable module (2) is fixed to the stepped groove (11) of the main fixture (1) by a threaded connector. The inner diameter of the replaceable module (2) matches the mounting hole size of the brake disc.

2. The universal tooling for a double-sided precision grinding machine of a brake disc according to claim 1, characterized in that: The total length of the waist-shaped hole (12) is 23mm, and the axial adjustment tolerance is ±0.1mm. The positioning pin (3) is fixed at any position of the waist-shaped hole (12) by a locking nut.

3. The universal tooling for a double-sided precision grinding machine of brake discs according to claim 1, characterized in that: The diameter of the positioning pin (3) is 1-3 mm smaller than the minimum mounting hole diameter of the brake disc.

4. The universal tooling for a double-sided precision grinding machine of brake discs according to claim 1, characterized in that: The bottom of the stepped groove (11) is provided with a first threaded slot (13), and the end face of the replaceable module (2) is provided with a mounting through hole (21) at the corresponding position.

5. The universal tooling for a double-sided precision grinding machine of a brake disc according to claim 1, characterized in that: The main tooling (1) has four fixed through holes (14) arranged in a circular array on its circumferential edge, which are used to fix it to the grinding machine table by T-bolts.

6. The universal tooling for a double-sided precision grinding machine of a brake disc according to claim 1, characterized in that: The replaceable module (2) has a second threaded slot (22) at its center for installing an auxiliary positioning pin or a counterweight.

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