CN102435157B - Comprehensive checkout stand for high-speed hydraulic power chuck - Google Patents

Abstract

The invention discloses a comprehensive checkout stand for a high-speed hydraulic power chuck. The comprehensive checkout stand comprises a numerical control machine system, a hydraulic system and a data detection system, wherein the numerical control machine system comprises a checkout stand body, the checkout stand body is connected with a spindle box, a transmission spindle is arranged in the spindle box, and the transmission spindle is connected with a servo control system; the hydraulic system comprises a rotating oil cylinder, a power chuck, a water cooling machine, a hydraulic unit, and an oil cooling machine, the rotating oil cylinder and the power chuck are respectively arranged at two ends of the transmission spindle, the water cooling machine is connected with the transmission spindle, and the hydraulic unit is respectively connected with the rotating oil cylinder and the oil cooling machine; and the data detection system comprises a laser displacement sensing device and a clamp force sensing device, the laser displacement sensing device is connected with a control computer through a data acquisition card, and the clamp force sensing device is connected with the control computer. The comprehensive checkout stand for the high-speed hydraulic power chuck has a simple structure, is convenient to operate and can accurately measure high-speed clamp precision, repeatability precision, clamp force and limit speed of the hydraulic power chuck.

Description

Comprehensive inspection table for high-speed hydraulic power chuck

technical field

The invention belongs to the technical field of hydraulic power chuck detection equipment, and in particular relates to a measuring device for high-speed clamping accuracy, repeatability, clamping force and limit speed of hydraulic power chucks of different sizes.

Background technique

With the development of high-speed cutting technology, hydraulic power chucks stand out from pneumatic power chucks and electric power chucks, and become the mainstream fixtures for medium and high-speed CNC machine tools. The hydraulic power chuck combines hydraulic transmission technology and self-centering chuck technology, utilizes the characteristics of high power density ratio of hydraulic transmission, and has the advantages of large clamping force, high speed and compact structure. Hydraulic power chucks have been widely used in CNC machine tools, and have become an indispensable basic functional component for medium and high-speed CNC lathes, CNC grinding machines and CNC turning and milling centers.

However, compared to high-speed milling and grinding, high-speed turning is not widely used in mass production. The main reason for this is that in continuous high-speed cutting, a safe and flexible chuck clamping system cannot be effectively guaranteed. During the use of the chuck clamping system, the chuck fails due to the eccentricity of the axis line, the workpiece is not clamped tightly, and the parts are broken, and the chuck clamping system rotates at a high speed and stores a large amount of kinetic energy. Insufficient clamping force leads to the failure of the chuck clamping system, which can cause the workpiece to fly out of the chuck, damage the machine and endanger the operator. A statistic shows that in the metal industry, at least 10% of accident injuries are caused by chuck clamping system failures. Obviously, the chuck clamping system is the weak link of the lathe and limits the realization of high speed rotation.

At present, there is no perfect high-speed hydraulic power chuck testing equipment in China. In terms of the measurement of the clamping accuracy of the chuck, the traditional method is to measure the runout of the test rod at a position that is several times the length of the shaft diameter at a low speed of less than 60 rpm to measure its runout after clamping the test rod. Jumping during high-speed rotation; and the traditional way is to obtain the runout value through contact measurement, which is prone to friction and wear during measurement, which affects the measurement accuracy.

Contents of the invention

Purpose of the invention: The purpose of the present invention is to solve the above technical problems and provide a hydraulic power chuck comprehensive inspection platform with simple structure and convenient operation, which is convenient for high-speed clamping accuracy, repeatability, clamping force and limit of hydraulic power chucks. Accurate measurement of rotational speed.

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

A high-speed hydraulic power chuck comprehensive inspection platform, which includes a numerical control machine tool system, a hydraulic system and a data detection system; The transmission main shaft includes a common main shaft and an electric main shaft; the No. 1 rotary oil cylinder and the large power chuck are respectively fixed at both ends of the common main shaft, and the No. 2 rotary oil cylinder and the small power chuck are respectively fixed at both ends of the electric main shaft; Ordinary spindles and electric spindles are also connected to the servo control system respectively; the hydraulic system includes the No. 1 rotary oil cylinder and the No. The main shaft, the hydraulic station is respectively connected to the No. 1 rotary oil cylinder and the No. 2 rotary oil cylinder, and the oil cooler is connected to the hydraulic station; the data detection system includes a laser displacement sensor device and a clamping force sensor device, and the laser displacement sensor The device is connected to a control computer through a data acquisition card; the clamping force sensing device is connected to the control computer through a data line.

The laser displacement sensing device includes a laser measuring head bracket and a laser measuring head control box fixed on the inspection table body, the laser measuring head bracket is provided with a laser measuring head, and the laser measuring head passes through the laser measuring head control box The data acquisition card is connected; the laser measuring head control box is connected with the servo control system.

The laser measuring head bracket includes a bracket spindle rod, and the bracket spindle rod is fixed on the inspection table body through the first magnetic base; the upper and lower sliding rods are fixed on the bracket spindle rod through a locking switch, and the upper and lower sliding rods are provided with left and right The through hole through which the sliding rod passes; one end of the left and right sliding rod passes through the through hole on the upper and lower sliding rod, and the other end is fixed on the vertical rod; the upper end of the upper and lower sliding rod is fixed with a locking bolt, and the other end of the locking bolt passes through The vertical rod is passed through and fixed by a lock nut; the upper ends of the upper and lower sliding rods and the vertical rod are respectively provided with clamping plates, and the laser measuring head is fixed between the clamping plates.

The clamping force sensing device includes a clamping force measuring head, a rotating speed measuring magnetic rod, a magnetic rod bracket and a handheld unit, the clamping force measuring head is fixed in the power chuck to be tested, and the rotating speed measuring magnetic rod Fixed on the magnetic rod bracket, the bottom of the magnetic rod bracket is fixed on the inspection table body through the second magnetic base; the magnetic induction point of the magnetic rod for speed measurement is aligned with the clamping force measuring head, and the distance between the clamping force measuring head and the handheld unit The room is wirelessly connected, and the handheld unit is connected to the control computer through a data cable.

A safety shield is arranged around the inspection table body; the thickness of the safety shield is greater than 5mm.

Beneficial effects: the present invention combines numerical control machine tool technology and sensing technology together, and can realize the measurement of high-speed clamping accuracy, repeatability, clamping force and limit speed of high-speed hydraulic power chuck, and all measurement data can be obtained through the control computer Real-time display, easy to read measurement results; the invention has simple operation, high measurement accuracy, fills in some gaps in the performance detection of high-speed hydraulic power chucks, and has wide application prospects.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a schematic diagram of the front structure of the laser head measuring bracket.

Fig. 3 is a schematic diagram of the side structure of the laser head measuring bracket.

Fig. 4 is a structural schematic diagram of the magnetic bracket for measuring the rotational speed.

Figure 5 is the limit speed and clamping force curve

Detailed ways:

Below in conjunction with accompanying drawing, the invention is further explained.

As shown in Figures 1 to 4, a hydraulic power chuck comprehensive inspection platform of the present invention includes a numerical control machine tool system, a hydraulic system and a data detection system.

The CNC machine tool system includes a test bench body 1, which is provided with a spindle box 2, and the spindle box 2 is equipped with a transmission spindle. In order to meet the requirements of different speeds during measurement, the transmission spindle includes a common spindle 9 and an electric spindle 10. The ordinary main shaft 9 is powered by a motor (not shown in the figure) to rotate, and the electric main shaft 10 itself can provide power to rotate. The No. 1 rotary oil cylinder 11 and the large power chuck 13 are respectively fixed on the two ends of the ordinary main shaft 9. The speed of the large power chuck 13 is relatively slow (generally, the speed is 25-4500r/min); the No. 2 rotary oil cylinder 12 and the small power chuck Disks 14 are respectively fixed on both ends of the electric spindle 10 , and the speed of the small power chuck 14 is relatively high (generally 4000-8000r/min); the common spindle 9 and the electric spindle 10 are also connected to the servo control system 3 .

的动力卡盘，小动力卡盘14是指公称直径

在

的动力卡盘。Wherein, the large power chuck 13 refers to a nominal diameter of

The power chuck, the small power chuck 14 refers to the nominal diameter

exist

power chuck.

The hydraulic system includes No. 1 rotary oil cylinder 11 and No. 2 rotary oil cylinder 12 respectively providing power for the large power chuck 13 and the small power chuck 14. The rotary oil cylinder has protection measures for short-term pressure maintenance in case of sudden power failure. The water cooler 4 is connected to the electric spindle 10 to provide cooling for it; the hydraulic station 5 is respectively connected to the No. 1 rotary oil cylinder 11, the No. 2 rotary oil cylinder 12 and the oil cooler 6, and the oil cooler 6 provides cooling for the hydraulic station 5. .

The laser displacement sensing device is connected to the control computer 8 through the data acquisition card 7; the clamping force sensing device is connected to the control computer 8 through the data line.

Wherein, the laser displacement sensing device includes a laser measuring head bracket 16 and a laser measuring head control box 17 fixed on the inspection table body 1, a laser measuring head 18 is fixed on the laser measuring head bracket 16, and the laser measuring head The head 18 is connected to the data acquisition card 7 through the laser measurement head control box 17, and the data acquisition card 7 is connected to the control computer 8; the laser measurement head control box 17 is connected to the servo control system 3.

The laser measuring head bracket 16 includes a bracket spindle rod 19, which is fixed on the inspection table body 1 through a first magnetic base 20; an up and down sliding rod 21 is fixed on the bracket spindle rod 19 through a locking switch. The lock switch includes a threaded rod with a through hole larger than the diameter of the upper and lower sliding rods 21 at one end, and a fixing nut at the other end of the threaded rod. Loosen the fixing nut, the up and down sliding rod 21 can freely move up and down in the through hole of the threaded rod, and then adjust the up and down position of the laser measuring head 18 fixed on the up and down sliding rod 21 .

The upper end of the up and down sliding rod 21 is provided with a through hole for the left and right sliding rods 22 to pass through. One end of the left and right slide bar 22 passes through the through hole on the up and down slide bar 21, and the other end is fixed on the vertical bar 23; the upper end of the up and down slide bar 21 is fixed with a locking bolt, and the other end of the locking bolt passes through the vertical bar 23, and fixed by lock nuts; the upper ends of the upper and lower sliding rods 21 and the vertical rods 23 are respectively provided with a clamping plate 24, and the laser measuring head 18 is fixed between the two clamping plates 24. Loosen the locking nut, the two clamping plates 24 are separated, then put the laser measuring head 18 between the two clamping plates 24, tighten the locking nut, and then fix the laser measuring head 18.

The clamping force sensing device includes a clamping force measuring head 25 , a rotational speed measuring magnetic rod 26 , a magnetic rod bracket 27 and a handheld unit 28 . The clamping force measuring head 25 is installed in the power chuck to be tested, the rotational speed measuring magnetic rod 26 is fixed on the magnetic rod bracket 27, and the bottom of the magnetic rod bracket 27 is fixed on the test bench body 1 through the second magnetic base 29 . When in use, just align the magnetic induction point of the rotating speed measuring magnetic rod 26 with the clamping force measuring head 25, which is a wireless connection between the clamping force measuring head 25 and the handheld unit 28, and the handheld unit 28 is connected to the control computer through a data line 8. Wherein the clamping force measuring head 25, the rotational speed measuring magnetic rod 26 and the hand-held unit 28 are parts of a clamping force tester available on the market.

Through the two magnetic bases, the laser measuring head bracket 16 and the magnetic bar bracket 27 can easily and conveniently install the laser measuring head 18 and the rotating speed measuring magnetic bar 26 on any position on the test bench body 1, which is convenient for testing and adjustment.

The steps for measuring the high-speed clamping accuracy, repeatability, clamping force and limit speed of hydraulic power chucks using this comprehensive test bench are as follows:

1) Clamp the test rod 30 in the large power chuck 13 or small power chuck 14 to be tested.

2) Fix the laser measuring head 18 horizontally through the clamping plate 24 on the laser measuring head bracket 16; adjust the upper and lower sliding rods 21 so that the height of the laser emission point on the laser measuring head 18 is aligned with the axis of the inspection rod 30; the height adjustment is completed Finally, move the laser measuring head bracket 16 to the position of the detection point according to the machinery industry standard of the People's Republic of China. When the radial distance between the detection point position and the laser measuring head 18 is the best, the indicator light on the laser measuring head 18 is green, and the rotation of the second A magnetic switch on a magnetic base 20 fixes the laser measuring head bracket 16 on the inspection table body 1 .

3) Start the measuring head control box 17 and the control computer 8, open the corresponding control software in the control computer 8, and repeat the disassembly and assembly of the test rod 30 for 3 to 5 times. Measure the amount of change in the position of the central axis of the test rod 30 in each clamping state during the rotation of several circles. The displacement close to the laser measuring head 18 is a positive value, and the distance away from the laser measuring head 18 is a negative value. Take the positive value of the displacement. The maximum value of the absolute value and the negative value is the maximum beating amount; compare the maximum beating amount measured in the process of each rotation several times after repeated disassembly and assembly 3 to 5 times, and the largest value is its Repeatability; then, through the servo control system 3, the common spindle 9 or the electric spindle 10 is rotated at high speed, and the displacement signal of the central axis position change of the inspection rod 30 collected by the laser measuring head 18 passes through the laser measuring head control box 17, data acquisition The card 7 is continuously displayed on the control computer 8 in real time, that is, the control computer 8 can display in real time the fluctuation curve of the displacement of the central axis of the test rod 30 with time. Similarly, the displacement close to the laser measuring head 18 is a positive value, and the distance away from the laser measurement The value of the head 18 is a negative value, and the maximum value among the absolute value of the positive value and the negative value of the displacement is taken, which is the high-speed clamping accuracy.

4) After the ordinary spindle 9 or electric spindle 10 stops rotating, fix the clamping force measuring head 25 in the large power chuck 13 or small power chuck 14 to be tested, and fix the magnetic rod 26 for speed measurement on the magnetic rod bracket 27 Align the magnetic induction point on the rotating speed measuring magnetic rod 26 with the clamping force measuring head 25, and rotate the magnetic switch of the second magnetic base 29 to fix the magnetic rod bracket 27 on the test bench body 1.

5) After connecting the hand-held unit 28 to the control computer 8, turn on the hand-held unit 28, start the No. 1 rotary cylinder 11 or the No. 2 rotary cylinder 12, and apply clamping force to the test rod 30. The clamping force measuring head 25 transmits the clamping force signal to the handheld unit 28 through wireless transmission; at the same time, when the clamping force measuring head 25 rotates once, the magnetic block on the rotational speed measurement magnetic rod 26 will trigger the clamping force measuring head 25 The magnetic device in the clamping force measuring head 25 can automatically record the number of triggers, and according to the number of triggers, the number of rotations of the clamping force measuring head 25 can be known; the clamping force measuring head 25 wirelessly transmits these signals to the handheld unit 28, through The control computer 8 outputs the clamping force-speed relationship curve in real time (as shown in Figure 5). According to the machinery industry standard JB/T3860, the clamping force of the power chuck at the limit speed should not be less than 2/3 of the measured maximum clamping force. That is, the speed corresponding to 2/3 of the maximum clamping force is its limit speed. In Figure 5, the maximum clamping force is 100 kilonewtons (KN), and the corresponding speed at around 66 kilonewtons is 3000 revolutions per minute (r/min), which is its limit speed.

In the measurement process, when the dynamic balance of the large power chuck 13 or the small power chuck 14 vibrates, the displacement signal is transmitted to the laser measuring head control box 17 through the laser measuring head 18, and the laser measuring head control box 17 then The signal is fed back to the servo control system 3 to realize the automatic shutdown protection of the CNC machine tool system.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (6)

1. a comprehensive checkout stand for high-speed hydraulic power chuck, is characterized in that, it comprises numerically-controlled machine tool system, hydraulic system and data detection system;

Described numerically-controlled machine tool system comprises check-out console body (1), and described check-out console body (1) is connected with main spindle box (2), and described main spindle box is equipped with transmission main shaft in (2), and described transmission main shaft comprises common main shaft (9) and electric main shaft (10); An angling cylinder (11) and large power chuck (13) are separately fixed at the two ends of common main shaft (9), and No. two angling cylinders (12) and low-power chuck (14) are separately fixed at the two ends of electric main shaft (10); Common main shaft (9) is also connected with servo-control system (3) respectively with electric main shaft (10);

Described hydraulic system comprises and is respectively an angling cylinder (11), No. two angling cylinders (12) that large power chuck (13), low-power chuck (14) provide power, described water chiller (4) connects electric main shaft (10), described Hydraulic Station (5) connects respectively an angling cylinder (11) and No. two angling cylinders (12), and oily cooler (6) connects Hydraulic Station (5);

Described data detection system comprises laser displacement sensing device and clamping force sensing device, and described laser displacement sensing device is connected and controlled computer (8) by data collecting card (7); Clamping force sensing device is connected with control computer (8) by data line.

2. a kind of comprehensive checkout stand for high-speed hydraulic power chuck according to claim 1, it is characterized in that, described laser displacement sensing device comprises laser measurement head bracket (16) and the laser measuring head control box (17) being fixed on check-out console body (1), on described laser measurement head bracket (16), be provided with laser measuring head (18), described laser measuring head (18) is by laser measuring head control box (17) connection data capture card (7); Described laser measuring head control box (17) connects servo-control system (3).

3. a kind of comprehensive checkout stand for high-speed hydraulic power chuck according to claim 2, it is characterized in that, laser measurement head bracket (16) comprises support spindle rod (19), and described support spindle rod (19) is fixed on check-out console body (1) by the first magnetic bases (20); At support spindle rod (19), above by locking switch, be fixed with and slide up and down bar (21), slide up and down bar (21) and be provided with the through hole that can pass for the bar (22) that horizontally slips; Horizontally slip one end of bar (22) through sliding up and down the through hole on bar (21), and the other end is fixed on vertical bar (23); The upper end that slides up and down bar (21) is fixed with clamping screw, and the other end of clamping screw passes vertical bar (23), and fixes by set nut; The described upper end that slides up and down bar (21) and vertical bar (23) is respectively equipped with clamping plate (24), and described laser measuring head (18) is fixed between clamping plate (24).

4. a kind of comprehensive checkout stand for high-speed hydraulic power chuck according to claim 1, it is characterized in that, described clamping force sensing device comprises clamping force measuring head (25), tachometric survey magnetism stick (26), magnetism stick support (27) and handheld unit (28), described clamping force measuring head (25) is fixed in power chuck to be measured, it is upper that described tachometric survey magnetism stick (26) is fixed on magnetism stick support (27), and the bottom of magnetism stick support (27) is fixed on check-out console body (1) by the second magnetic bases (29); The magnetic induction point of tachometric survey magnetism stick (26) is aimed at clamping force measuring head (25), is wireless connections between described clamping force measuring head (25) and handheld unit (28), and handheld unit (28) is connected and controlled computer (8) by data line.

5. a kind of comprehensive checkout stand for high-speed hydraulic power chuck according to claim 1, is characterized in that, the surrounding of described check-out console body (1) is provided with safty shield (15).

6. a kind of comprehensive checkout stand for high-speed hydraulic power chuck according to claim 5, is characterized in that, the thickness of described safty shield (15) is greater than 5mm.

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