Machining process of automobile brake disc

Abstract

The invention provides a machining process of an automobile brake disc. The machining technology of the automobile brake disc comprises the following steps that S1, the rigidity of a workpiece is verified; S2, the verified rigid workpiece is blanked; s3, the blanked workpiece is installed on a chuck to be clamped, and then a workbench is rotated at a low speed; s4, a dial indicator is fixed to the tool rest, and then the runout of the braking surface is measured; and S5, single-tool machining. The machining technology of the automobile brake disc has the advantages that operation is easy, cost is low, and under the condition that equipment investment is not increased, the precision of the brake disc can meet the product requirement through a common horizontal numerical control vehicle or a vertical numerical control vehicle.

Description

Technical Field

[0001] The invention belongs to the technical field of instrument processing, and in particular relates to a processing technology for an automobile brake disc. Background Art

[0002] The usual requirement for the roughness of the brake disc surface is no more than 1.6um, the runout relative to the flange mounting surface is 0.04mm, and the parallelism is 0.05mm (such as Figure 1 ), the processing equipment is an ordinary CNC lathe or vertical lathe. This kind of brake disc can only be used on mini cars or mini trucks with poor precision requirements, and it is easy to produce brake noise and vibration during braking, and sometimes it also affects the braking force, greatly affecting the comfort of the car. The precision of the brake disc for cars is higher (such as Figure 2 S6 brake disc), especially the roughness, must be firmly controlled between 1.0-2.0um. The wall thickness difference is required to be no more than 0.009 on the same circumference and no more than 0.04 on the radial direction. The same industry uses CNC lathes and adopts double-knife synchronous turning technology to ensure this. Some will also use two brake surfaces to grind or roll burnishing technology at the same time according to customer requirements, but the price of this equipment is high. How can we use ordinary horizontal CNC lathes or vertical CNC lathes to make the brake disc precision meet product requirements without increasing equipment investment?

[0003] Therefore, it is necessary to provide a new processing technology for automobile brake disc to solve the above-mentioned technical problems. Summary of the invention

[0004] The technical problem solved by the present invention is to provide a processing technology for automobile brake discs which is simple to operate, low in cost and can use an ordinary horizontal CNC lathe or a vertical CNC lathe to make the brake discs reach the precision required by the product without increasing the equipment investment.

[0005] In order to solve the above technical problems, the present invention provides a processing technology for a vehicle brake disc, comprising the following steps:

[0006] S1. Verify the rigidity of the workpiece:

[0007] S2. Cut the verified rigid workpiece;

[0008] S3. Mount the unloaded workpiece on the chuck and clamp it, then rotate the worktable at a low speed;

[0009] S4. Fix the dial indicator to the tool holder and measure the runout of the brake surface;

[0010] S5. Single tool processing.

[0011] As a further solution of the present invention, the measuring position of the dial indicator remains unchanged, and the worktable is rotated at high speed. When the speed reaches the finishing speed, the change in the runout is compared.

[0012] As a further solution of the present invention, the blade of the tool holder is a CBN blade.

[0013] As a further solution of the present invention, the life of the CBN blade is stabilized to 60 to 130 pieces.

[0014] As a further solution of the present invention, the processing parameters are: VC=600-800m / mim, f=0.19-0.2, and processing allowance 0.3mm.

[0015] As a further solution of the present invention, the rotation speed of the low-speed rotation is 18 m / min.

[0016] As a further solution of the present invention, the rotation speed of the high-speed rotation is 800m / min.

[0017] As a further solution of the present invention, the measured braking surface runout is 0.04.

[0018] Compared with the related art, the processing technology of the automobile brake disc provided by the present invention has the following beneficial effects:

[0019] 1. The present invention is simple to operate and low in cost. Without increasing equipment investment, the accuracy of the brake disc can be achieved by using an ordinary horizontal CNC lathe or a vertical CNC lathe to meet product requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0021] Figure 1 A schematic diagram of the existing structural technology Figure 1 ;

[0022] Figure 2 A schematic diagram of the existing structural technology Figure 2 ;

[0023] Figure 3 It is a schematic diagram of the present invention. DETAILED DESCRIPTION

[0024] Please refer to Figure 3 ,in, Figure 3 The processing technology of automobile brake disc comprises the following steps:

[0025] S1. Verify the rigidity of the workpiece:

[0026] S2. Cut the verified rigid workpiece;

[0027] S3. Mount the unloaded workpiece on the chuck and clamp it, then rotate the worktable at a low speed;

[0028] S4. Fix the dial indicator to the tool holder and measure the runout of the brake surface;

[0029] S5. Single tool processing.

[0030] The measuring position of the dial indicator remains unchanged, and the worktable is rotated at high speed. When the speed reaches the finishing speed, the change in the runout is compared.

[0031] The blade of the tool holder is a CBN blade.

[0032] The life of the CBN inserts is stable to 60 pieces.

[0033] The processing parameters are: VC=800m / mim, f=0.2, and processing allowance 0.3mm.

[0034] The rotation speed of the low-speed rotation is 18-20 m / min.

[0035] The rotation speed of the high-speed rotation is 800-850 m / min.

[0036] The measured braking surface runout is 0.04.

[0037] Single-tool machining is used, that is, the workpiece is clamped and positioned once, the mounting surface is machined first, then one brake surface is machined, and finally the other brake surface is machined. Figure 3 As shown in the figure, the two brake surfaces processed after one clamping and positioning of the workpiece are slightly less efficient than double knives, but the accuracy is not inferior to double knives. In addition, this processing method has another advantage: if the blade is close to wear and the roughness of the two surfaces is inconsistent, the roughness of the two surfaces can be guaranteed to be consistent by changing the processing parameters of one of the surfaces, and the tool life can also be increased, which cannot be achieved by double knife processing.

[0038] Things to note during processing: Depending on the size and precision requirements of the product, the processing parameters are also different, especially when processing thin-walled disks. If the parameters are not selected properly, it will cause tool vibration. At this time, the accuracy cannot meet the product requirements. Usually, the method of reducing the cutting speed is used to ensure accuracy. This requires on-site verification. The tool life and cutting parameters are based on the material and precision requirements of the product and cannot be generalized.

[0039] Example 1

[0040] The processing technology of automobile brake disc (K8 brake disc processing) includes the following steps:

[0041] S1. Install the K8 brake disc (after semi-finishing) onto the chuck and clamp it;

[0042] S2. Fix the dial indicator to the tool holder, rotate the workbench at a low speed (18m / min), and measure the runout of the brake surface to be 0.04;

[0043] S3. The dial indicator keeps the measuring position unchanged, and the worktable is rotated at high speed (800m / min) until the speed reaches the speed for finishing. The measured brake surface runout is 0.04, indicating that the rigidity of this disc is good.

[0044] S4. Assemble the CBN blade on the tool holder and adjust the equipment parameters to: VC = 800m / mim, f = 0.18, machining allowance 0.26mm;

[0045] S5. Single tool processing.

[0046] The roughness of the first 60 pieces after processing was measured to be 1.20-1.52um, which met the product requirements.

[0047] Example 2

[0048] The processing technology of automobile brake disc (K8 brake disc processing) includes the following steps:

[0049] S1. Install the K8 brake disc (after semi-finishing) onto the chuck and clamp it;

[0050] S2. Fix the dial indicator to the tool holder, rotate the workbench at a low speed (18m / min), and measure the runout of the brake surface to be 0.04;

[0051] S3. The dial indicator keeps the measuring position unchanged, and the worktable is rotated at high speed (800m / min) until the speed reaches the speed for finishing. The measured brake surface runout is 0.04, indicating that the rigidity of this disc is good.

[0052] S4. Assemble the CBN blade on the tool holder and adjust the equipment parameters to: VC = 600m / mim, f = 0.19, machining allowance 0.3mm;

[0053] S5. Single tool processing.

[0054] After continuous processing and measurement of 130 workpieces, the runout is no more than 0.02mm, the parallelism is no more than 0.025mm, the circumferential wall thickness difference is no more than 0.007, the radial thickness difference is no more than 0.04, and the roughness difference is between Ra1.3 and 1.7. The blade life is now stable at 130 pieces / blade, and the processing efficiency has also been improved, without affecting the pace required by customers.

[0055] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A processing technology for automobile brake disc, characterized in that: The following steps are involved: S1. Verify the rigidity of the workpiece; S2. Cut the verified rigid workpiece; S3. Mount the unloaded workpiece on the chuck and clamp it, then rotate the worktable at a low speed; S4. Fix the dial indicator to the tool holder and measure the runout of the brake surface; S5. Single tool processing.

2. The processing technology of automobile brake disc according to claim 1 is characterized in that: The measuring position of the dial indicator remains unchanged, and the worktable is rotated at high speed. When the speed reaches the finishing speed, the change in the runout is compared.

3. The processing technology of automobile brake disc according to claim 1 is characterized in that: The blade of the tool holder is a CBN blade.

4. The processing technology of automobile brake disc according to claim 1 is characterized in that: The life of the CBN blade is stabilized to 60 to 130 pieces.

5. The processing technology of automobile brake disc according to claim 1 is characterized in that: The processing parameters are: VC=600-800m / mim, f=0.19-0.2, and processing allowance 0.3mm.

6. The processing technology of automobile brake disc according to claim 1 is characterized in that: The rotation speed of the low-speed rotation is 18 m / min.

7. The processing technology of automobile brake disc according to claim 2, characterized in that: The rotation speed of the high-speed rotation is 800m / min.

8. The processing technology of automobile brake disc according to claim 1 is characterized in that: The measured braking surface runout is 0.04.

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