A measuring device for the distribution of machining allowance on the wheel surface of a torsion beam and its operating process

Abstract

The present invention discloses a measuring device for distributing machining allowance on the wheel surface of a torsion beam and its operation process. The device comprises a milling slide, a cylinder, a base, a transmission box, a linear guide, a guide sleeve, a compression spring, a measuring head, a connector, a sensor and a guide rod; wherein the base is arranged on the table surface of the milling slide; the cylinder is arranged on the side of the base and is connected to the transmission box through the base; the linear guide is arranged at the bottom of the base and is connected to the transmission box; a partition plate with a guide hole is arranged inside the transmission box, and the guide sleeve is arranged in the guide hole; the measuring head is fixed in the guide sleeve through a compression spring, and its end protrudes from one side of the transmission box; the guide rod is fixed between the partition plate and the end face of one side of the transmission box, and is parallel to the position of the measuring head; the sensor is fixed to the top of the transmission box through a connector. The device calculates a reasonable machining allowance by measuring a fixed point on the wheel surface and comparing it with the same point on the standard wheel surface.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical manufacturing, and in particular to a measuring device for distributing machining allowance on a torsion beam wheel surface and an operating process thereof. Background Art

[0002] For the processing of the wheel surface of the torsion beam rear axle, the auto parts companies usually use the following methods: one is the bushing positioning, the other is the pin hole positioning under the crossbeam. These two processing methods can only guarantee the total length of the rear axle, but the rigidity of the wheel surface cannot be guaranteed.

[0003] Bushing positioning: fixed double-sided milling machine, the machine is fixed after adjusting the milling head angle at the toe angle and camber angle of the rear axle, such as Figure 1 The fixture is processed with two sleeve holes for positioning, and the end face of one sleeve is used as a fixed point; there are three fixed points under the crossbeam, and there is an auxiliary support under each of the two front rotary clamping cylinders, which can ensure the size from the end face of one sleeve to the wheel face at one end and the distance between the centers of the two wheel faces.

[0004] Pin hole positioning under the crossbeam: A fixed double-sided milling machine is used. The machine is fixed after adjusting the milling head angle at the toe angle and camber angle of the rear axle, and the two positioning pins under the crossbeam are used for positioning. Figure 2 As shown in the figure, the fixture is positioned with two pin holes under the crossbeam, one of which is fixed, and the other can move up and down, left and right to compensate for the offset of the crossbeams on both sides during welding. At the same time, in order to offset the cutting force borne by the wheel surface during cutting and reduce the deformation of the wheel surface, two auxiliary supports are added in the center of the wheel surface, and two oil cylinders are used as the supporting force. This ensures the size from the fixed pin hole to a wheel end face and the center distance between the two wheel surfaces.

[0005] The above two types of fixtures have problems in the process of machining. The roughness and flatness of the wheel surface are not easy to guarantee. The milled surface has obvious vibration lines, the flatness reaches 0.2mm, and the roughness is 25μm. In order to ensure the firmness of the workpiece during the machining process, the system pressure of the machine tool hydraulic station must be 50kg / cm 2 After clamping, the wheel surface deforms by 0.08mm in the Z direction and 0.1mm in the X direction. At the same time, these two processing methods can only guarantee the total length of the rear axle, but the rigid thickness of the wheel surface cannot be guaranteed. During processing, it was found that due to the deformation of the wheel panel during welding, the processing allowance is uncertain when processing different workpieces, with a small one of only about 0.5mm and a large one of about 4-5mm, which can easily cause "stuffy car" phenomenon and damage the tool and spindle. And the processed wheel surface has no rigidity at all. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a measuring device for distributing machining allowance on the surface of a torsion beam wheel and its operating process. By measuring four fixed points on the wheel surface and comparing them with the same points on the standard wheel surface, a reasonable machining allowance is calculated to ensure the thickness of the wheel surface and the rigidity of the wheel surface.

[0007] The present invention is achieved through the following technical solutions:

[0008] A measuring device for distributing machining allowance on the wheel surface of a torsion beam comprises a milling slide, and also comprises a cylinder, a base, a transmission box, a linear guide, a guide sleeve, a compression spring, a measuring head, a connector, a sensor and a guide rod; wherein the base is arranged on the table surface of the milling slide; the cylinder is arranged on the side of the base and is connected to the transmission box through the base; the linear guide is arranged at the bottom of the base and is connected to the transmission box to control the moving trajectory of the transmission box; the transmission box is a box-shaped structure, a vertical partition plate is arranged inside it, a guide hole is arranged on the plate surface, and the guide sleeve is arranged in the guide hole; the measuring head fixes its step surface in the guide sleeve through the compression spring, and its end protrudes from one side of the transmission box; the guide rod is arranged inside the transmission box, fixed between the partition plate and the end face of one side of the transmission box, and parallel to the position of the measuring head; the sensor is arranged at the top of the transmission box, fixedly connected to the measuring head through the connector, and slidably connected to the guide rod through the connector.

[0009] Preferably, the number of the measuring heads is 4, which are marked as A1, A2, A3, and A4 respectively.

[0010] An operating process of a device for measuring a machining allowance distribution of a torsion beam wheel surface, comprising the following steps:

[0011] Step 1) milling the torsion beam wheel surface and sending it to a three-dimensional coordinate measuring machine for measurement to obtain the measured value, and according to the theoretical size on the part drawing, calculating the ideal value of the measuring points B1-B4 after processing, and taking the ideal values ​​of the four measuring points B1-B4 as the standard value for milling processing;

[0012] Step 2) Place the part on the processing fixture and clamp it. As the milling slide completes a feed, the cylinder pushes the transmission box to move along the linear guide mounted on the base. The reading scale of the sensor is fixed to the side of the base. The reading head on the sensor is fixed to the measuring head through a connector and slides on the guide rod to ensure the smooth movement of the reading head. Under the push of the cylinder, it moves with the transmission box. The guide sleeve is fixed in the guide hole of the transmission box, and the compression spring is sleeved on the measuring head. Due to the action of the compression spring, the step surface of the measuring head is tightly attached to the inner end face of the transmission box. When each measuring head in A1-A4 is in contact with the measuring head, the measuring head moves smoothly. When the wheel surfaces collide, the transmission box continues to move forward under the action of the cylinder, while the measuring head compresses the compression spring and stops moving forward, thereby obtaining an absolute value. The absolute value is subtracted from the standard value measured in step 1) of the point to obtain the relative value of the point, and the minimum value is read; if the value is greater than the set maximum milling amount and still cannot meet the processing requirements after considering the deviation value, the part is scrapped; if the value is less than the minimum cutting amount and still cannot meet the processing requirements after considering the deviation value, the part is scrapped; in other cases, the relative value minus the deviation is the minimum milling allowance and the maximum milling allowance.

[0013] The beneficial effects of the present invention are as follows:

[0014] The present invention is aimed at the existing torsion beam wheel surface processing, which cannot guarantee the thickness of the wheel surface on the basis of ensuring the total length, thereby reducing the rigidity of the wheel surface. By measuring four fixed points on the wheel surface and comparing them with the same points on the standard wheel surface, a reasonable processing allowance is calculated to ensure the thickness of the wheel surface and the rigidity of the wheel surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the structural diagram of the sleeve positioning fixture;

[0016] Figure 2 This is the structural diagram of the pin hole positioning fixture;

[0017] Figure 3 A cross-sectional view of a measuring device for allocating machining allowances to the wheel face of a torsion beam;

[0018] Figure 4 Left side view of the measuring device for allocating machining allowances to the wheel face of the torsion beam;

[0019] In the figure: 1. Cylinder; 2. Base; 3. Transmission box; 4. Linear guide; 5. Guide sleeve; 6. Compression spring; 7. Measuring head; 8. Connector; 9. Sensor; 10. Guide rod; 11. Partition plate; 12. Milling slide; 13. Guide hole. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0021] Example 1

[0022] A device for measuring the machining allowance of a torsion beam wheel surface distribution includes a milling slide 12, such as Figure 3 As shown, it also includes a cylinder 1, a base 2, a transmission box 3, a linear guide 4, a guide sleeve 5, a compression spring 6, a measuring head 7, a connector 8, a sensor 9 and a guide rod 10; wherein the base 2 is arranged on the table surface of the milling slide 12; the cylinder 1 is arranged on the side of the base 2, and is connected to the transmission box 3 through the base 2; the linear guide 4 is arranged at the bottom of the base 2, and is connected to the transmission box 3 to control the movement trajectory of the transmission box 3; the transmission box 3 is a box-shaped structure, and a vertical partition plate 11 is arranged inside it, and a partition plate 11 is arranged on the plate surface A guide hole 13 is provided, and the guide sleeve 5 is arranged in the guide hole 13; the measuring head 7 is fixed to the guide sleeve 5 by the compression spring 6, and its end protrudes from one side of the transmission box 3; the guide rod 10 is arranged inside the transmission box 3, fixed between the partition plate 11 and the end face of one side of the transmission box 3, and parallel to the position of the measuring head 7; the sensor 9 is arranged at the top of the transmission box 3, fixedly connected to the measuring head 7 through the connector 8, and slidably connected to the guide rod 10 through the connector 8. Among them, the guide rod 10 is used as a guide rail of the connector 8 between the measuring head 7 and the sensor 9 to ensure its horizontal movement; and the sensor 9 is used to measure the actual size of the wheel surface, and compare it with the requirements of the reference size, and ensure the thickness of the wheel plate through a logical relationship.

[0023] The number of the measuring heads 7 is 4, which are marked as A1, A2, A3, and A4 respectively. Figure 4 As shown, the specific operation process of the measuring device is as follows:

[0024] (1) Processing of standard test pieces: Mill the wheel surface of the torsion beam and send it to a three-dimensional coordinate measuring machine for measurement. The measured values ​​are obtained. According to the theoretical dimensions on the part drawing, the ideal values ​​of the measuring points B1-B4 after processing are calculated, and the ideal values ​​of the four measuring points B1-B4 are used as the standard values ​​for milling processing;

[0025] (2) Processing of parts: The parts are placed on the processing fixture and clamped, and the measuring device is used to measure the data. As the milling slide 12 completes a feed, the cylinder 1 pushes the transmission box 3 to move along the linear guide 4 installed on the base 2. The reading scale of the sensor 9 is fixed to the side of the base 2. The reading head on the sensor 9 is fixed to the measuring head 7 through the connector 8 and slides on the guide rod 10 to ensure the smooth movement of the reading head. Under the push of the cylinder 1, it moves with the transmission box 3. The guide sleeve 5 is fixed in the guide hole 13 of the transmission box 3. The compression spring 6 is sleeved on the measuring head 7. Due to the action of the compression spring 6, the step surface of the measuring head 7 is tightly attached to the inner end surface of the transmission box 3. When A When each measuring head in 1-A4 collides with the wheel surface, the transmission box 3 continues to move forward under the action of the cylinder 1, while the measuring head compresses the compression spring 6 and stops moving forward, thereby obtaining an absolute value. The absolute value is subtracted from the standard value measured in step (1) of the point to obtain the relative value of the point, and the minimum value is read; if the value is greater than the set maximum milling amount (the allowance for comparing the relative value with the ideal value) and still cannot meet the processing requirements after considering the deviation value, the part is scrapped; if the value is less than the minimum cutting amount and still cannot meet the processing requirements after considering the deviation value, the part is scrapped; in other cases, the relative value minus the deviation is the minimum milling allowance and the maximum milling allowance.

[0026] In actual use, the wheel panel thickness is 7mm, which is required to be greater than 5mm after processing, and the part deviation is ±0.6mm. Table 1 below gives the test pieces measured by this measuring device and the corresponding part processing results for reference.

[0027] Table 1 Specimen measurement and processing results (unit: mm)

[0028]

[0029] The above-described embodiments merely express the implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. Any technical solution obtained in the form of equivalent substitution or equivalent transformation should be included in the protection scope of the claims of the present invention.

Claims

1. A device for measuring the machining allowance of a torsion beam wheel surface, comprising a milling slide, characterized in that: It also includes a cylinder, a base, a transmission box, a linear guide, a guide sleeve, a compression spring, a measuring head, a connector, a sensor and a guide rod; wherein the base is arranged on the table surface of the milling slide; the cylinder is arranged on the side of the base and is connected to the transmission box through the base; the linear guide is arranged at the bottom of the base and is connected to the transmission box to control the movement trajectory of the transmission box; the transmission box is a box-shaped structure, a vertical partition plate is arranged inside it, a guide hole is arranged on the plate surface, and the guide sleeve is arranged in the guide hole; the measuring head fixes its step surface in the guide sleeve through the compression spring, and its end protrudes from one side of the transmission box; the guide rod is arranged inside the transmission box, fixed between the partition plate and the end face of one side of the transmission box, and parallel to the position of the measuring head; the sensor is arranged at the top of the transmission box, fixedly connected to the measuring head through the connector, and slidably connected to the guide rod through the connector; There are four measuring heads, marked as A1, A2, A3, and A4 respectively; The operation process of the measuring device for the distribution of machining allowance on the torsion beam wheel surface comprises the following steps: Step 1) Mill the torsion beam wheel surface and send it to a three-dimensional coordinate measuring machine for measurement. The measured value is obtained. According to the theoretical size on the part drawing, the ideal value of the measuring points B1-B4 after processing is calculated, and the ideal values ​​of the four measuring points B1-B4 are used as the standard values ​​for milling processing; Step 2) Place the part on the processing fixture and clamp it. As the milling slide completes a feed, the cylinder pushes the transmission box to move along the linear guide mounted on the base. The sensor's reading scale is fixed to the side of the base. The reading head on the sensor is fixed to the measuring head through a connector and slides on the guide rod to ensure the smooth movement of the reading head. Under the push of the cylinder, it moves with the transmission box. The guide sleeve is fixed in the guide hole of the transmission box, and the compression spring is sleeved on the measuring head. Due to the action of the compression spring, the step surface of the measuring head is tightly attached to the inner end face of the transmission box. When each measuring head in A1-A4 is in contact with the wheel When the two surfaces collide, the transmission box continues to move forward under the action of the cylinder, while the measuring head compresses the compression spring and stops moving forward, thereby obtaining an absolute value. The absolute value is subtracted from the standard value measured in step 1) of the point to obtain the relative value of the point, and the minimum value is read; if the minimum value is greater than the set maximum milling amount and still cannot meet the processing requirements after considering the deviation value, the part is scrapped; if the minimum value is less than the minimum cutting amount and still cannot meet the processing requirements after considering the deviation value, the part is scrapped; in other cases, the relative value minus the deviation is the minimum milling allowance and the maximum milling allowance.

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