Deep hole high-precision depth control device

Abstract

The utility model discloses a deep hole high-precision depth control device, and belongs to the technical field of deep hole machining. The device comprises a machining cutter body, a boring head supporting block, a boring head, a fixed-length boring rod, an adjusting rod and a limiting device. The two ends of the fixed-length boring rod are connected with a boring head and an adjusting rod respectively, a machining cutter body and a supporting block are installed on the boring head, three limiting grooves are distributed in the surface of the adjusting rod in the axial direction, and the relation between three related sizes of the three limiting grooves relative to the end face of the boring head and depth sizes L1, L2 and L3 in a part body is established through conversion. The sizes L1, L2 and L3 of the part body during machining are controlled through a limiting groove in the adjusting rod 7; the limiting device is installed on the adjusting rod and limited by the limiting groove, and the limiting device determines the difference value between the machining depth and the depth required by a drawing through reading. According to the utility model, the clearance error of long-distance transmission of deep hole equipment can be effectively avoided, so that the precise depth dimensional tolerance can be better ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of deep hole machining, in particular to a deep hole high-precision depth control device. Background Art

[0002] Conventional drill collar deep hole processing such as Figure 1 As shown in the figure, the key dimensions of the processing are L1 and L2, and the tolerances of L1 and L2 are both ±0.1mm. The conventional processing steps are as follows:

[0003] 1) Machine the D3 hole diameter and depth (L3-L2) in the drill collar (part body), leaving a finishing allowance for the depth;

[0004] 2) Use the inner hole D3 to locate and process the hole diameter D1 and the hole depth L1;

[0005] 3) Use the inner hole D3 to locate and process the hole diameter D2 and the hole depth L2;

[0006] 4) Finishing D3 hole depth dimension;

[0007] 5) Use D3 inner hole positioning to machine 6x20° chamfers;

[0008] Theoretically, this processing scheme can well produce the hole diameter and its corresponding depth dimension required by the diagram. However, in actual processing, since the deep hole equipment for drill collar processing is heavy equipment, its axial control accuracy will be greatly reduced under the influence of long-distance screw load transmission, wear and system rigidity, and often cannot reach the design accuracy of the equipment. The actual processing depth dimension often deviates greatly from the depth dimension set in the program. Generally, when the equipment is loaded and running for about 3 meters, the deviation value basically fluctuates between 0.1mm-0.2mm. Therefore, in the processing of this part, since the tolerance range of L1 and L2 dimensions is only 0.2mm, the usual practice is to first process D1L1 and D2L2 dimensions to meet the requirements, and then fine-process the remaining dimensions. In this process, since L1, L2 and L3 are all related dimensions, no matter which dimension is out of tolerance or out of tolerance, it will directly affect the other related dimensions. Therefore, when processing this feature of the part, there will be repeated clamping and rework work. It takes 4-5 days of processing cycle to process the entire feature to meet the requirements of the drawing, which is time-consuming and labor-intensive in production and processing, and the efficiency is very low. Utility Model Content

[0009] In view of this, the utility model provides a deep hole high-precision depth control device, which can effectively avoid the gap error of long-distance transmission of deep hole equipment, thereby better ensuring the precise depth size tolerance.

[0010] A deep hole high-precision depth control device comprises a machining cutter body, a boring head support block, a boring head, a fixed-length boring bar, an adjusting rod and a limit device;

[0011] The two ends of the fixed-size boring bar are respectively connected to the boring head and the adjusting rod, the boring head is equipped with a processing cutter body and a support block, the adjusting rod surface is provided with three limit grooves along the axial direction, the three limit grooves are relative to the three associated dimensions of the boring head end face and the depth dimensions L1, L2, L3 in the part body are established through conversion, and the dimensions L1, L2, L3 of the part body during processing are controlled by the limit grooves on the adjusting rod 7; the limit device is installed on the adjusting rod and is limited by the limit grooves, and the limit device determines the difference between the processing depth and the depth required by the drawing through readings.

[0012] Furthermore, it also includes a zeroing device, through which the depth reference is determined and zeroed before the boring head is processed.

[0013] Furthermore, the three associated dimensions on the adjusting rod are: the axial dimension between the left end face of the first limiting groove and the end face of the boring head is X, the axial dimension between the left end face of the first limiting groove and the left end face of the second limiting groove is Y, and the axial dimension between the left end face of the first limiting groove and the left end face of the third limiting groove is Z.

[0014] Furthermore, a dial indicator is installed in the limit device, and the dial indicator directly reads the reading on the end face of the part body.

[0015] Furthermore, the fixed-size boring bar is a boring bar of standard length processed according to the hole depth size of the processed product.

[0016] Beneficial effects:

[0017] 1. The surface of the adjusting rod of the utility model is provided with three limit grooves distributed axially. The three limit grooves are related to the three associated dimensions of the end face of the boring head and the depth dimensions L1, L2, and L3 in the part body through conversion, so that the invisible and intangible deep hole processing depth dimension can be intuitively reflected on the adjusting rod connected to the boring bar. During processing, all connections between the tool tip and the adjusting rod are rigid connections, which effectively avoids the gap error of the long-distance transmission of the deep hole equipment, thereby better ensuring the precise depth dimension tolerance.

[0018] 2. The utility model can process all hole diameters and depth dimensions in one clamping, and can ensure that all depth dimensions meet the requirements of the drawings.

[0019] 3. The utility model can process all hole diameters and depth dimensions through one clamping, avoiding repeated clamping and rework work in the conventional processing process, greatly shortening the processing cycle of this feature from the previous 4-5 days to 3 days, greatly improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of deep hole processing of drill collar;

[0021] Figure 2 This is a schematic diagram of the structure of the high-precision depth control device (before deep hole processing);

[0022] Figure 3 It is a schematic diagram of the structure of the high-precision depth control device (in deep hole processing);

[0023] Figure 4 Schematic diagram of key depth control.

[0024] Among them, 1-part body, 2-zeroing device, 3-machining tool body, 4-boring head support block, 5-boring head, 6-fixed-size boring bar, 7-adjusting rod, 8-limiting device. DETAILED DESCRIPTION

[0025] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0026] As attached Figure 2 and 3 As shown, the utility model provides a deep hole high-precision depth control device, including a zeroing device 2, a processing tool body 3, a boring head support block 4, a boring head 5, a fixed-length boring bar 6, an adjusting rod 7 and a limit device 8.

[0027] The functions of each component are as follows: zeroing device 2: before the boring head is processed, the depth reference is determined and zeroed through this device; processing tool body 3: the tool used for processing the product; boring head support block 4: the boring head is kept straightened in the center of the part during processing; boring head 5: positioning the processing tool body and support block; fixed-size boring bar 6: a boring bar of standard length processed according to the hole depth size of the processed product; adjusting rod 7: the values ​​of the three dimensions XYZ in the diagram can be adjusted according to different hole depths to meet more needs; reading device 8: the difference between the processing depth and the depth required by the drawing is determined by the reading of the dial indicator in this device.

[0028] There are three limit grooves on the adjustment rod 7. The associated dimensions X, Y, and Z of these three grooves relative to the end face of the boring head 5 can be converted to establish a certain relationship with L1, L2, and L3 in the figure. Therefore, the dimensions L1, L2, and L3 of the part during processing can be controlled by the limit grooves on the adjustment rod 7. Specifically, the axial dimension between the left end face of the first limit groove and the end face of the boring head is X, the axial dimension between the left end face of the first limit groove and the left end face of the second limit groove is Y, and the axial dimension between the left end face of the first limit groove and the left end face of the third limit groove is Z.

[0029] As attached Figure 2As shown, before processing, the zeroing device 2 is placed on the end face of the part body 1, and the boring head 5 is made to contact the gauge on the zeroing device 2 and generate a certain amount of pressure. The pressure is recorded and the processing zero point is set. After confirming the zero point, the part is processed according to normal operation. The processing process is no different from the conventional processing process.

[0030] As attached Figure 3 and 4 As shown, when the required depth dimension is almost reached, the depth of the machining cutter body 3 can be directly determined by the limit groove on the adjustment rod 7 combined with the limit device 8. For example, when machining the aperture D3 and depth (L3-L2) in the figure below, the limit device 8 can be intuitively installed in the limit groove corresponding to the (XY) dimension through the device, because there is a conversion relationship between the dimensions (XY) and (L3-L2), the actual machining depth dimension of the machining cutter body 3 can be directly obtained by conversion. A dial indicator is installed in the limit device 8, and the meter reading can be directly taken on the end face of the part 1.

[0031] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A deep hole high-precision depth control device, characterized in that: It includes a machining cutter body, a boring head support block, a boring head, a fixed-length boring bar, an adjusting rod and a limiting device; The two ends of the fixed-length boring bar are respectively connected to a boring head and an adjusting rod, a machining cutter body and a support block are installed on the boring head, three limit grooves are distributed along the axial direction on the surface of the adjusting rod, and the three associated dimensions of the three limit grooves relative to the end face of the boring head are converted and established with the depth dimensions L1, L2, and L3 of the part body. During machining, the dimensions L1, L2, and L3 of the part body are controlled by the limit grooves on the adjusting rod (7); the limit device is installed on the adjusting rod and is limited by the limit grooves, and the limit device determines the difference between the machining depth and the depth required by the drawing by reading.

2. The deep hole high-precision depth control device according to claim 1, characterized in that: It also includes a zeroing device, through which the depth reference is determined and zeroed before the boring head is processed.

3. The deep hole high-precision depth control device according to claim 2, characterized in that: The three associated dimensions on the adjusting rod are: the axial dimension between the left end face of the first limiting groove and the end face of the boring head is X, the axial dimension between the left end face of the first limiting groove and the left end face of the second limiting groove is Y, and the axial dimension between the left end face of the first limiting groove and the left end face of the third limiting groove is Z.

4. The deep hole high-precision depth control device according to claim 3, characterized in that: A dial indicator is installed in the limit device, and the dial indicator directly reads the end surface of the part body.

5. The deep hole high-precision depth control device according to claim 3 or 4, characterized in that: The fixed-size boring bar is a boring bar of standard length processed according to the hole depth size of the processed product.

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