Measuring device for sealing cover

Abstract

The utility model relates to the technical field of automobile part measurement, in particular to a measuring device for a sealing cover, which comprises a bottom plate, a fixing block, a measuring meter, a calibration block and a positioning stop dog, two bosses are transversely arranged on the surface of the bottom plate, the heights of the two bosses are the same, an avoiding groove is arranged between the two bosses, and the positioning stop dog is arranged in the avoiding groove. A positioning stop block is installed on the top of one boss close to the edge of the bottom plate, a fixing block is further installed on the surface of the bottom plate, and a measuring probe of the measuring meter penetrates through an installation hole of the fixing block. Compared with the prior art, the measuring device for the sealing cover is designed, the sealing cover is stably placed on the two bosses by avoiding the central bulge of the sealing cover through the avoiding groove, and the contact position of the measuring probe and the sealing cover is ensured to be the middle position of a welding area through the arrangement of the positioning stop block and the fixing block, so that the measuring result is stable and reliable. The device is simple in structure, can rapidly measure the sizes of all batches of sealing covers, and facilitates the stable and simple control of the subsequent welding process.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile component measurement, in particular to a measuring device for a sealing cover. Background Art

[0002] After the worm gear pair is assembled in the servo housing, the sealing cover of the steering gear servo unit needs to be sealed. Sealing is to install the sealing cover at the opening position of the worm gear cavity of the servo housing.

[0003] The assembly process of the sealing cover and the servo housing is rather special. Specifically, after being pressed into place, ultrasonic equipment is required to melt the area around the contact between the sealing cover and the servo housing. The melted material flows into the groove of the housing to form a buckle, thereby fixing it.

[0004] The sealing cover and the servo housing are assembled by welding with an ultrasonic welding machine on the machine tool. The requirements of ultrasonic welding are to ensure that the appearance of the parts is intact, and at the same time, the matching surface, that is, the contact surface between the sealing cover and the servo housing, and the buckle formed by melting must provide sufficient strength. In the production process, in order to meet the requirements, the machine tool needs to use welding parameters that match the product to avoid perforation caused by intense welding or low strength caused by too little welding, which will lead to product waste and production time loss.

[0005] Different matching dimensions require different welding processes. Usually, a matching dimension change of more than 0.05mm will result in unqualified welding. Therefore, in order to meet the requirements of ultrasonic welding, it is necessary to control the matching dimensions of the sealing cover and the servo housing to fluctuate within a suitable range.

[0006] Since the sealing cover is an injection molded part, the size fluctuation of the assembly area varies greatly from batch to batch. Therefore, the sealing cover needs to be pre-dried before welding. The traditional method is to use a vernier caliper to spot check a number of sealing covers in each batch, determine the required drying time according to the size of the parts, and make the size of different batches of sealing covers after pre-drying fluctuate within a smaller range.

[0007] However, in actual production, it was found that the sealing cover has an irregular shape and has the following special features: 1. The sealing cover 1 is provided with 16 small reinforcing ribs 11, and the shape of the sealing cover is wavy. The size of the entire outer circle is unstable. For the same sealing cover, the outer diameter of different circumferential positions fluctuates by more than 0.05mm. 2. Due to the problem of the sealing cover production process, the part has a draft angle. Figure 2 , Figure 3As shown, the non-contact area 14 between the sealing cover and the servo housing is arranged outside the welding area 13, and because the welding area 13 is tapered, the outer diameters of different positions of the welding area 13 differ by more than 0.05 mm. 3. The sealing cover 1 is provided with 8 large reinforcing ribs 12, which causes the center of the sealing cover 1 to bulge, with a height difference of more than 0.2 mm.

[0008] The special-shaped features of the sealing cover also lead to instability in the measurement process. The small reinforcing ribs and draft angles lead to a high rate of manual measurement errors, and it is easy to use the outer diameter of the non-contact area 14 as the measurement result. Moreover, when different people measure the same sealing cover, the size will fluctuate between the outer diameters at different positions in the welding area 13, and the accuracy of the measurement cannot be guaranteed. During the measurement, the bulge in the center of the sealing cover caused the sealing cover to tilt, which increased the difficulty of measurement. At present, the sealing cover can only be re-measured by three-coordinate measurement at a relatively low frequency, which requires a long waiting time and cannot cover all batches of sealing covers. This leads to unstable production process control.

[0009] Therefore, it is necessary to design a measuring device for the sealing cover to be compatible with the special-shaped features of the sealing cover and to quickly and accurately measure the size of the sealing cover, thereby reducing scrap in the welding process and improving the stability of the process. Summary of the invention

[0010] The utility model aims to overcome the deficiencies of the prior art and provides a measuring device for a sealing cover, which is compatible with the special-shaped features of the sealing cover and can quickly and accurately measure the size of the sealing cover, thereby reducing scrapping in the welding process and improving the stability of the process.

[0011] In order to achieve the above-mentioned purpose, the utility model is a measuring device for a sealing cover, comprising a base plate, a fixed block, a measuring table, a calibration block, and a positioning block. Two bosses are horizontally arranged on the surface of the base plate, and the two bosses have the same height. An avoidance groove is arranged between the two bosses. A positioning block is installed on the top of a boss close to the edge of the base plate. A fixed block is also installed on the surface of the base plate. A measuring probe of the measuring table passes through the mounting hole of the fixed block. A calibration block or a sealing cover is placed between the measuring probe of the measuring table and the positioning block. The end of the measuring probe of the measuring table contacts the middle position of the welding area of ​​the sealing cover, or contacts the middle position of the calibration block.

[0012] The avoidance groove corresponds to the central protrusion position of the sealing cover.

[0013] The calibration block is mounted on two bosses, one end of the calibration block abuts against the positioning stopper, and the other end of the calibration block contacts the end of the measuring probe.

[0014] The sealing cover is mounted on two bosses, one end of the sealing cover abuts against the positioning stopper, the other end of the sealing cover contacts the end of the measuring probe, and the central protrusion of the sealing cover is located in the avoidance groove.

[0015] The end of the measuring probe of the measuring meter is semicircular.

[0016] Compared with the prior art, the utility model designs a measuring device for the sealing cover, avoids the central protrusion of the sealing cover by the avoidance groove, so that the sealing cover is stably placed on the two bosses, and the setting of the positioning block and the fixing block ensures that the contact position between the measuring probe and the sealing cover is the middle position of the welding area, so that the measurement result is stable and reliable. The utility model has a simple structure and can quickly measure the dimensions of all batches of sealing covers, which is convenient for the stable and simple control of the subsequent welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the sealing cover.

[0018] Figure 2 Schematic diagram of the draft angle of the sealing cover.

[0019] Figure 3 for Figure 2 Enlarged view of point A.

[0020] Figure 4 It is a structural schematic diagram of the utility model.

[0021] Figure 5 It is a top view of the utility model in use.

[0022] Figure 6 It is a side view of the utility model in use. Implementation

[0023] The utility model is now further described with reference to the accompanying drawings.

[0024] See also Figure 4 The utility model is a measuring device for a sealing cover, comprising a bottom plate, a fixed block, a measuring table, a calibration block, and a positioning block. Two bosses 22 are horizontally arranged on the surface of the bottom plate 2. The two bosses 22 have the same height. An avoidance groove 21 is arranged between the two bosses 22. A positioning block 6 is installed on the top of a boss 22 close to the edge of the bottom plate 2. A fixed block 3 is also installed on the surface of the bottom plate 2. A measuring probe 41 of the measuring table 4 passes through the mounting hole of the fixed block 3. A calibration block 5 or a sealing cover 1 is placed between the measuring probe 41 of the measuring table 4 and the positioning block 6. The end of the measuring probe 41 of the measuring table 4 contacts the middle position of the welding area 13 of the sealing cover 1, or contacts the middle position of the calibration block 5.

[0025] In the present invention, the avoidance groove 21 corresponds to the central protrusion of the sealing cover 1 , so that the central protrusion of the sealing cover 1 is placed in the avoidance groove 21 , so that the sealing cover 1 is stably mounted on the two bosses 22 .

[0026] The calibration block 5 is mounted on the two bosses 22 , one end of the calibration block 5 abuts against the positioning stopper 6 , and the other end of the calibration block 5 contacts the end of the measuring probe 41 .

[0027] The sealing cover 1 is mounted on two bosses 22 , one end of the sealing cover 1 abuts against the positioning stopper 6 , the other end of the sealing cover 1 contacts the end of the measuring probe 41 , and the central raised position of the sealing cover 1 is located in the avoidance groove 21 .

[0028] When the utility model is working, first use the calibration block 5 to calibrate the measuring device, place one end of the calibration block 5 against the positioning block 6, slowly push it to the position of the measuring probe 41, and stop the measuring probe 41 in the middle of the calibration block 5. Check the position of the measuring meter 4, and manually turn the meter head of the measuring meter 4 until the measuring meter 4 displays zero.

[0029] like Figure 5 , 6 As shown, the sealing cover 1 is placed flat on the two bosses 22 of the bottom plate 2. The central raised part of the sealing cover 1 is placed at the avoidance groove 21 to avoid dimensional errors caused by deformation of the sealing cover 1. The parting line of the sealing cover 1 is vertical, one end of the parting line is close to the positioning block 6, and the other end of the parting line contacts the measuring probe 41. The measuring probe 41 contacts the middle position of the welding area 13 of the sealing cover 1, and the value of the measuring gauge 4 is read to complete the measurement of the outer diameter of the sealing cover 1.

[0030] During the measurement process, the thickness of the middle position of the welding area 13 of the sealing cover 1 is 0.8mm, and the fluctuation of the thickness of the part is 0.3mm. The measuring probe 41 is placed in the middle position of the welding area 13 through the fixing block 3, and the fluctuation of plus or minus 0.15mm does not affect the size measurement. At the same time, the end of the measuring probe 41 of the measuring table 4 is semicircular and contacts the sealing cover 1 at one point, further reducing the measurement error.

[0031] The parting line of the sealing cover 1 needs to be manually aligned with the measuring device, and the accuracy requirement here is relatively low. The reason is that there is a 2.5mm wide rib in the parting line area of ​​the sealing cover, and the size of the rib area is consistent. That is, any point measured within the 2.5mm area can ensure the stability of the measurement result.

[0032] After multiple measurements of the same batch of sealing caps, the pre-drying time is determined based on the average value. After pre-drying, the sealing caps are put on line and pressed and welded by subsequent equipment.

[0033] The utility model designs a measuring device for the sealing cover, which avoids the central protrusion of the sealing cover through the avoidance groove, so that the sealing cover is stably placed on the two bosses, and the positioning block and the fixed block are set to ensure that the contact position between the measuring probe and the sealing cover is the middle position of the welding area, so that the measurement result is stable and reliable. The utility model has a simple structure and can quickly measure the dimensions of all batches of sealing covers, which is convenient for the stable and simple control of the subsequent welding process.

Claims

1. A measuring device for a sealing cover, comprising a base plate, a fixing block, a measuring meter, a calibration block, and a positioning block, characterized in that: Two bosses (22) are laterally arranged on the surface of the bottom plate (2), the two bosses (22) have the same height, an avoidance groove (21) is arranged between the two bosses (22), a positioning block (6) is installed on the top of a boss (22) close to the edge of the bottom plate (2), a fixing block (3) is also installed on the surface of the bottom plate (2), a measuring probe (41) of the measuring meter (4) passes through the mounting hole of the fixing block (3), a calibration block (5) or a sealing cover (1) is placed between the measuring probe (41) of the measuring meter (4) and the positioning block (6), and an end of the measuring probe (41) of the measuring meter (4) contacts the middle position of the welding area (13) of the sealing cover (1), or contacts the middle position of the calibration block (5).

2. A measuring device for a sealing cover according to claim 1, characterized in that: The avoidance groove (21) corresponds to the central raised position of the sealing cover (1).

3. A measuring device for a sealing cover according to claim 1, characterized in that: The calibration block (5) is mounted on two bosses (22), one end of the calibration block (5) abuts against the positioning stopper (6), and the other end of the calibration block (5) contacts the end of the measuring probe (41).

4. A measuring device for a sealing cover according to claim 1, characterized in that: The sealing cover (1) is mounted on two bosses (22), one end of the sealing cover (1) abuts against the positioning stopper (6), the other end of the sealing cover (1) contacts the end of the measuring probe (41), and the central raised position of the sealing cover (1) is located in the avoidance groove (21).

5. A measuring device for a sealing cover according to claim 1, characterized in that: The end of the measuring probe (41) of the measuring meter (4) is semicircular.

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