CN217475506U

CN217475506U - Digit control machine tool gauge head calibrating device

Info

Publication number: CN217475506U
Application number: CN202221586877.XU
Authority: CN
Inventors: 樊克应
Original assignee: Xiangyang Fuda Dongkang Crankshaft Co ltd
Current assignee: Xiangyang Fuda Dongkang Crankshaft Co ltd
Priority date: 2022-06-24
Filing date: 2022-06-24
Publication date: 2022-09-23
Anticipated expiration: 2032-06-24

Abstract

A calibrating device for measuring heads of a numerical control machine tool is mainly used for calibrating measuring heads of the numerical control machine tool for machining flange holes in two ends of a crankshaft. The base fixedly connects the bottom plate to the workbench through a second bolt, and the high-precision three-jaw self-centering chuck of the clamping component and a mandrel of the base are fixedly connected together with a bolt hole through a third bolt; and respectively aligning and pressing the dial indicator of the magnetic dial indicator assembly on a clamping journal and a measuring needle of a machine tool measuring head, and detecting the outer circle runout of the clamping journal and the measuring needle. When an operator calibrates the measuring head on the calibrating device, the operation mode is not limited by space, the measuring head can be calibrated only by clamping the measuring head on a high-precision three-jaw self-centering chuck on the calibrating device and slightly rotating the chuck, and the operation method is simple; meanwhile, the calibration device can calibrate the measuring head, can also test the jumping of other shaft parts and the tip, and can better ensure the calibration efficiency and the calibration precision.

Description

Digit control machine tool gauge head calibrating device

Technical Field

The utility model relates to an automobile parts makes technical field, specifically is a device that is used for digit control machine tool gauge head in calibration processing bent axle both ends flange hole.

Background

The process flow of crankshaft manufacturing comprises the following steps: rough and fine turning of a large head and a small head, milling of all shaft necks, oil hole drilling, heat treatment, fine grinding of all shaft necks and end faces, machining of flange holes at two ends of a crankshaft, fine grinding of the large head and the small head, and milling of a key groove of a balancing block. The working procedure of processing the flange holes at the two ends of the crankshaft is an important and banding working procedure in the manufacturing process of the crankshaft. The end face of the small end and the end face of the large end of the crankshaft are provided with flange holes with different sizes and numbers, the position degrees of the flange holes of the large end and the small end are measured by taking the large end face and the large end excircle as well as the small end face and the small end excircle as references, and the precision requirement is very high.

The measuring head of machine tool can be mounted on the numerically-controlled machine tool, and can make said numerically-controlled machine tool implement automatic measurement of size and position of large and small heads of crankshaft directly without human intervention in the course of machining cycle, and can automatically correct the offset of large and small heads of crankshaft according to the measured result.

The function of the machine tool measuring head:

1. in the machining process of the numerical control machine tool, the crankshaft can be automatically centered, edge-searching, measured, automatically corrected in a coordinate system and automatically subjected to tool compensation instead of manual work; the crankshafts are batched and divided into a middle part and a middle part to be finished at one time, so that the first part is convenient and quick to debug, sample and determine a production scheme.

2. And directly measuring the big end face and the big end excircle, and the small end face and the small end excircle of the crankshaft on a machine tool.

3. The machining capacity and the precision of the existing machine tool can be improved, the crankshaft can be corrected on line once, and secondary clamping, reworking and repairing are not needed.

4. The auxiliary time of machine tool processing can be reduced, and the manufacturing cost is reduced.

Before the flange holes at two ends of the crankshaft are machined, measuring heads of a machine tool are used for measuring, analyzing and correcting the outer circles and two end faces of the large heads and the small heads at two ends of the crankshaft so as to ensure the machining precision of a tool of the machine tool. In particular to a clamping shaft neck of a machine tool measuring head and a clamping shaft neck of a cutter, which have the same structure. During detection, the cutter is taken down, the machine tool measuring head is installed at the position where the cutter is installed, the excircle and the end face of the big end and the small end at the two ends of the crankshaft are measured, data collected after measurement are analyzed, the position of the clamping cutter is adjusted to the initial position of machining flange holes at the two ends theoretically, then the machine tool measuring head is changed, and the cutter is changed for machining. In the actual production process, along with the frequent type change of various products of crankshaft flange hole processing to and the frequency increase of using the lathe gauge head, there is the error grow phenomenon in the use measuring accuracy of lathe gauge head. Therefore, it is very important to research a calibration device for a measuring head of a flange hole machine tool.

Disclosure of Invention

For overcoming the deficiencies in the prior art, the invention aims to provide a calibrating device for measuring heads of a numerical control machine tool, which is used for realizing the calibration of the measuring heads of the machine tool, and detecting whether a measuring pin with a contact head on the measuring head of the machine tool and a clamping shaft neck are coaxial or not, so that the self precision is qualified before the use of the numerical control machine tool.

In order to realize the aim, the base of the calibrating device is fixedly connected with the bottom plate on the workbench through the second bolt, and the high-precision three-jaw self-centering chuck of the clamping part and the mandrel of the base are fixedly connected with the bolt hole through the third bolt; and respectively aligning and pressing the dial indicator of the magnetic dial indicator assembly on a clamping journal and a measuring needle of a machine tool measuring head, and detecting the outer circle runout of the clamping journal and the measuring needle.

The lower end of a thrust ball bearing of the base is attached to the bottom plate, the outer circle of the lower end of the thrust ball bearing is in interference fit with the inner hole of the fixed sleeve, and the inner circle of the lower end of the thrust ball bearing is in clearance fit with the mandrel; the upper end of the thrust ball bearing is attached to a shaft shoulder at the tail part of the mandrel, an inner hole at the upper end of the thrust ball bearing is in interference fit with a shaft neck at the tail part of the mandrel, and an outer circle at the upper end of the thrust ball bearing is in clearance fit with an inner circle of the fixed sleeve; the inner rings of the two deep groove ball bearings are in interference fit with the excircle of the mandrel, and the outer rings of the two deep groove ball bearings are in interference fit with the inner circle of the fixed sleeve; a first spacer bush is arranged between the two deep groove ball bearings, and the inner circle of the first spacer bush is in clearance fit with the mandrel; the middle shaft shoulder of the mandrel is attached to the upper end face of the inner ring of the deep groove ball bearing; the upper end surface of the second spacer bush is attached to the end surface of the inner ring of the deep groove ball bearing, the lower end surface of the second spacer bush is attached to the end surface of the thrust ball bearing, and the inner circle of the second spacer bush is in clearance fit with the mandrel; the bearing cover is fixedly connected with the fixed sleeve through a first bolt, the bearing cover is in clearance fit with the mandrel, and the bearing cover is tightly pressed on the upper end face of the outer ring of the deep groove ball bearing; the fixed sleeve is fixedly connected with the bottom plate through the four bolts.

And the spigot of the high-precision three-jaw self-centering chuck is in gapless fit with the shoulder at the large end of the mandrel.

And the distance between the large head end of the mandrel and the bearing cover is L.

The utility model discloses when adopting the gauge head to measure on the digit control machine tool, install the gauge head on the main shaft of lathe earlier, then operating personnel manual control lathe removes, contact and the crankshaft surface contact on making the gauge head stylus, because the numerical control system of lathe records in real time and shows the position coordinate value of main shaft, therefore, can combine the contact of stylus and the concrete position relation of bent axle, utilize the coordinate value of lathe main shaft to convert out the relevant coordinate value of bent axle measuration point, after the relevant coordinate value of each measuration point of obtaining the bent axle, carry out relevant calculation according to the geometric position relation of each coordinate point again, alright in order to obtain final measuring result.

Compared with the prior art, when an operator calibrates the measuring head on the calibrating device, the operation mode is not limited by space, the measuring head can be calibrated only by clamping the measuring head on the high-precision three-jaw self-centering chuck on the calibrating device and slightly rotating the chuck, and the operation method is simple; meanwhile, the calibration device can calibrate the measuring head, can also test the runout of other shaft parts, and can well ensure the calibration efficiency and the calibration precision.

Drawings

Fig. 1 is a working schematic diagram of a measuring head of a numerical control machine tool.

Fig. 2 is a view taken along direction a of fig. 1.

Fig. 3 is a view from direction B of fig. 1.

Fig. 4 is a schematic structural diagram of the present invention.

Fig. 5 is a front view of the base of fig. 4.

Fig. 6 is a front view of the clamping member of fig. 4.

In the figure: 1. a small end face; 2. a small end excircle; 3. a crankshaft; 4. a big end excircle; 5. a big end surface; 6. a contact; 7. measuring a needle; 8. acoustic-optic signals; 9. an optical centerline; 10. a numerically controlled machine controller; 11. a measuring head; 12. clamping the shaft neck; 13. a flange hole; 14. a shoulder; 15. a first bolt; 16. fixing a sleeve; 17. a thrust ball bearing; 18. a base plate; 19. a second bolt; 20. a third bolt; 21. a mandrel; 22. a bearing cap; 23. a deep groove ball bearing; 24. a spacer bush I; 25. a second spacer sleeve; 26. a fourth bolt; 27. a base; 28. a work table; 29. a clamping member; 30. a three-jaw; 31. a high-precision three-jaw self-centering chuck; 32. bolt holes; 33. stopping the opening; 34. a padding block; 35. a magnetic dial indicator assembly; 36. a calibration device; 37. an inner hexagonal wrench; 38. a large head end.

Detailed Description

As shown in fig. 1, 2, 3, 4, 5, and 6, the operation principle of the numerically controlled machine tool probe 11 is as follows: the inside of the measuring head 11 is provided with a closed active circuit which is connected with the trigger mechanism, and as long as the trigger mechanism generates trigger action, the circuit state is changed and an acousto-optic signal 8 is emitted to indicate the working state of the measuring head 11, and the only condition for the trigger action generated by the trigger mechanism is that the measuring needle 7 of the measuring head 11 generates micro swing or moves towards the inside of the measuring head 11. When the measuring head 11 is connected to a main shaft of a machine tool and moves along with the main shaft, as long as the contact 6 on the measuring needle 7 is in surface contact with the large-head end surface 5, the large-head outer circle 4, the small-head end surface 1 and the small-head outer circle 2 of the crankshaft 3 in any direction, the measuring needle 7 slightly swings or moves, and the measuring head 11 can be immediately caused to generate an acoustic-optical signal 8 to indicate the working state of the measuring head. A numerical control machine tool controller 10 for receiving the acousto-optic signal 8 is mounted on the optical center line 9, so that the machine tool corrects the offset.

When the measuring head 11 is used for measuring on a numerical control machine tool, the measuring head 11 is firstly installed on a main shaft of the machine tool, then an operator manually controls the machine tool to move, so that the contact head 6 on the measuring needle 7 of the measuring head 11 is in contact with the surface of the crankshaft 3, and as the numerical control system of the machine tool records and displays the position coordinate value of the main shaft in real time, the coordinate value of the main shaft of the machine tool can be used for converting the relative coordinate value of the measured point of the crankshaft 3 by combining the specific position relationship between the contact head 6 of the measuring needle 7 and the crankshaft 3, so as to obtain the relative coordinate value of each measured point of the crankshaft 3, and then the relative calculation is carried out according to the geometric position relationship of each coordinate point, so that the final measuring result can be obtained.

The position tolerance of the flange holes 13 with phi 1, phi 2, phi 3 and phi 4 of the crankshaft 3 has different precision requirements. The utility model discloses a calibrating device 36 is whether to accord with self required precision in order to detect probe 11 area contact 6's stylus 7 and centre gripping axle journal 12's axiality, and only probe 11 is guaranteeing under the qualified state of self axiality, just can carry out accurate automatic measure to the size and the position of the big, little head of bent axle 3. The utility model discloses mainly include workstation 28, base 27, hold assembly 29, magnetic force percentage table assembly 35 and bed hedgehopping piece 34 etc..

As shown in fig. 4, 5, and 6, the base 27 of the calibrating device 36 of the present invention fixedly connects the bottom plate 18 to the worktable 28 through the second bolt 19, which can ensure stable operation when calibrating the measuring head; the high-precision three-jaw self-centering chuck 31 of the clamping part 29 is fixedly connected with the mandrel 21 of the base 27 through the third bolt 20 and the bolt hole 32, and the spigot 33 of the high-precision three-jaw self-centering chuck 31 is in gapless fit with the shoulder 14 on the large head end 38 of the mandrel 21, so that the mounting precision between the high-precision three-jaw self-centering chuck 31 and the mandrel 21 is ensured; in order to make the calibrating device 36 compact structure, the utility model discloses a less high-precision three-jaw self-centering chuck 31 of appearance to guarantee the tight precision of clamp of three-jaw jack catch 30 to the centre gripping axle journal 12 of gauge head 11.

The utility model discloses utilize thrust ball bearing 17 and two deep groove ball bearing 23's reasonable assembly, it is nimble to rotate when can making calibrating device detect the gauge head to calibrating device's runout precision can be guaranteed. The lower end of a thrust ball bearing 17 of the base 27 is attached to the bottom plate 18, the excircle of the lower end of the thrust ball bearing 17 is in interference fit with the inner hole of the fixed sleeve 16, and the inner circle of the lower end of the thrust ball bearing 17 is in clearance fit with the mandrel 21; the upper end of the thrust ball bearing 17 is attached to the shaft shoulder at the tail part of the mandrel 21, the inner hole at the upper end of the thrust ball bearing 17 is in interference fit with the shaft neck at the tail part of the mandrel 21, and the excircle at the upper end of the thrust ball bearing 17 is in clearance fit with the inner circle of the fixed sleeve 16; the inner rings of the two deep groove ball bearings 23 are in interference fit with the excircle of the mandrel 21, and the outer rings are in interference fit with the inner circle of the fixed sleeve 16; a first spacer sleeve 24 is arranged between the two deep groove ball bearings 23, and the inner circle of the first spacer sleeve 24 is in clearance fit with the mandrel 21; the middle shaft shoulder of the mandrel 21 is attached to the upper end face of the inner ring of the deep groove ball bearing 23; the upper end surface of the second spacer sleeve 25 is attached to the end surface of the inner ring of the deep groove ball bearing 23, the lower end surface of the second spacer sleeve 25 is attached to the end surface of the thrust ball bearing 17, and the inner circle of the second spacer sleeve 25 is in clearance fit with the mandrel 21; the bearing cover 22 is fixedly connected with the fixed sleeve 16 through a first bolt 15, the bearing cover 22 is in clearance fit with the mandrel 21, and the bearing cover 22 is tightly pressed on the upper end face of the outer ring of the deep groove ball bearing 23; the fixing sleeve 16 is fixedly connected with the bottom plate 18 through a bolt four 26.

In order to ensure that the high-precision three-jaw self-centering chuck 31 does not interfere with the large head end 38 of the mandrel 21 or the bearing cap 22 when the high-precision three-jaw self-centering chuck 31 is disassembled to ensure that the high-precision three-jaw self-centering chuck 20 is screwed or unscrewed by using the hexagon socket wrench 37, and the disassembly and assembly phenomenon cannot be caused, the distance between the large head end 38 of the mandrel 21 and the bearing cap 22 is L.

During detection, the dial indicator of the magnetic dial indicator assembly 35 firstly detects the outer circle jump of the clamping shaft neck 12: aligning and pressing a dial indicator on the clamping journal 12, adjusting the length of the dial indicator to be 0, manually rotating the high-precision three-jaw self-centering chuck 31, and determining that the maximum reading of the deflection of the long needle of the dial indicator is the outer circle run-out, and determining that the dial indicator is qualified if the maximum reading is not out of tolerance; if the external circle of the clamping journal 12 is out of tolerance, the out of tolerance reasons need to be checked, such as whether the external circle of the clamping journal 12 and the three-jaw clamping jaw 30 are cleaned up, whether the clamping is loosened, whether the manufacturing precision of the calibrating device is out of tolerance, and the like, until the external circle of the clamping journal 12 is qualified in jumping.

Then the magnetic dial indicator assembly 35 is placed on the heightening block 34, and the dial indicator is used for detecting the outer circle jump of the measuring pin 7: aligning and pressing a dial indicator on the measuring pin 7, adjusting the length of the dial indicator to be 0, manually rotating the high-precision three-jaw self-centering chuck 31, and determining that the maximum reading of the deflection of the long pin of the dial indicator is the outer circle runout, and determining that the dial indicator is qualified if the maximum reading is not out of tolerance; if the excircle runout of the measuring pin 7 is out of tolerance, the measuring pin 7 needs to be debugged, and then the excircle runout of the debugged measuring pin 7 is detected until the excircle runout of the measuring pin 7 is qualified.

Claims

1. The utility model provides a digit control machine tool gauge head calibrating device which characterized in that: a base (27) of the calibrating device (36) fixedly connects a bottom plate (18) to a workbench (28) through a second bolt (19), and a high-precision three-jaw self-centering chuck (31) of a clamping part (29) and a mandrel (21) of the base (27) are fixedly connected together with a bolt hole (32) through a third bolt (20); and (3) respectively aligning and pressing dial indicators of the magnetic dial indicator assembly (35) on a clamping journal (12) and a measuring needle (7) of a machine tool measuring head (11), and detecting the outer circle runout of the clamping journal (12) and the measuring needle (7).

2. A numerically controlled machine tool probe calibration device according to claim 1, characterized in that: the lower end of a thrust ball bearing (17) of the base (27) is attached to the bottom plate (18), the outer circle of the lower end of the thrust ball bearing (17) is in interference fit with the inner hole of the fixed sleeve (16), and the inner circle of the lower end of the thrust ball bearing (17) is in clearance fit with the mandrel (21); the upper end of the thrust ball bearing (17) is attached to a shaft shoulder at the tail part of the mandrel (21), an inner hole at the upper end of the thrust ball bearing (17) is in interference fit with a shaft neck at the tail part of the mandrel (21), and an excircle at the upper end of the thrust ball bearing (17) is in clearance fit with an inner circle of the fixed sleeve (16); the inner rings of the two deep groove ball bearings (23) are in interference fit with the excircle of the mandrel (21), and the outer rings are in interference fit with the inner circle of the fixed sleeve (16); a first spacer bush (24) is arranged between the two deep groove ball bearings (23), and the inner circle of the first spacer bush (24) is in clearance fit with the mandrel (21); the middle shaft shoulder of the mandrel (21) is attached to the upper end face of the inner ring of the deep groove ball bearing (23); the upper end surface of the second spacer sleeve (25) is attached to the end surface of the inner ring of the deep groove ball bearing (23), the lower end surface of the second spacer sleeve (25) is attached to the end surface of the thrust ball bearing (17), and the inner circle of the second spacer sleeve (25) is in clearance fit with the mandrel (21); the bearing cover (22) is fixedly connected with the fixed sleeve (16) through a first bolt (15), the bearing cover (22) is in clearance fit with the mandrel (21), and the bearing cover (22) is tightly pressed on the upper end face of the outer ring of the deep groove ball bearing (23); the fixed sleeve (16) is fixedly connected with the bottom plate (18) through a bolt four (26).

3. A numerically controlled machine tool probe calibration device according to claim 1, characterized in that: the seam allowance (33) of the high-precision three-jaw self-centering chuck (31) is in clearance-free fit with the shoulder (14) on the large head end (38) of the mandrel (21).

4. A numerically controlled machine tool probe calibration device according to claim 1, characterized in that: the distance between the large end of the mandrel (21) and the bearing cover (22) is L.