KR101895511B1 - Double-ended centering machine - Google Patents

Abstract

The present invention relates to a centering machine configured to automatize centering process on both ends of a cut round and, more specifically, to a double-ended centering machine which comprises: a clamp device mounting a cut round rod and performing clamping and unclamping motion; a left and right side rotating tool device to centering process the cut round rod clamped by the clamp device; and a control box to which a PLC controller to control a sequence circuit for the clamp device and the left and right side rotating tool device is attached.

Description

Double-ended centering machine

The present invention relates to a centering machine capable of automatically centering both ends of a cut round bar. More specifically, the centering machine includes a clamp device for placing a round bar and performing clamping and unclamping operations, Left and right rotary tool units for centering a cutting circular bar clamped to a clamping device, and a control box having a PLC controller for sequencer circuit control, a clamping device and left and right rotary tool devices.

Generally, a round bar is a long rod-shaped iron rod called a bar rod. It is classified as a round bar according to its surface roughness. Its surface is smooth and oiled, its cut surface is round and it is called a round bar. It has a rough surface, But it is classified as a black round bar with a round cross-section.

The round bar is divided into rolled products and forged products according to the processing method, and the rolled products are those rolled out from the semi-finished products. Forged products are made by knocking on the semi-finished products and the rolled products are thick enough to be rolled, To get it, it is tapped.

S45C is carbon steel for mechanical structure. Unlike general hot rolled steel or cold rolled steel, S45C is a post-treated steel with excellent tensile strength. It has a carbon content of 0.42 ~ 0.48 and a hardness of 167 ~ 269HB , SS400 is a general structural steel with a carbon content ranging from 0.37 to 0.43 and a hardness ranging from 156 to 255HB. SCM400 is also called special steel. In order to improve properties such as tensile strength or to impart properties such as corrosion resistance, SCM400 has nickel, chromium, molybdenum , And manganese. In addition, various kinds of round rods are produced according to the content of carbon and the elements added at the time of production.

The round bar is used in many industrial fields using CNC machine tools or universal lathe as the main material of circular workpieces. In particular, in the processing industry, round bars are chamfered before machining of the workpieces. After centering, the CNC machine tools or universal lathes And a round bar is chucked to a chuck fastened to the main shaft of the rotor.

However, in the inner diameter machining for the round bar, the center bar of the round bar must be used to reduce the load on the keyless chuck or the drill fastened to the barb, and when cutting the round bar, After the round bar is chucked, the live center is inserted into the sleeve insertion part of the pressure bar, and the outer diameter cutting process is performed. Without the centering part at the center of the round bar as a material, a safety accident occurs due to the material because the round bar is not centered. Is not located at the center, it is difficult to rotate at high speed due to shaking when the round bar is rotated by the main shaft, and the life of the bite tip and drill is shortened. If the centering position is not uniform in operation of the CNC machine tool There is a problem that the correction value for the program must be continuously corrected.

As a related art related to this, there is a self-aligning double-end machining machine disclosed in Korean Patent Laid-Open Publication No. 10-2003-0041750.

In the above-described Patent Document, the operation of the clamping device is controlled by a sequence circuit in a both-end processing machine for chamfering or knurling both ends of a pipe or a round bar, and a circular workpiece Clamp cylinder 101 is provided on the upper part of the clamping device frame so as to precisely clamp the center of the workpiece 2 when alternately clamping the workpiece 2 and prevent the workpiece 2 from being shaken by an impact caused by the tool 3 during processing A guide roller 102 is screwed to an end of the clamp cylinder 101 and a guide plate 103 for guiding the guide roller 102 is installed at a lower portion of the frame, And the other connecting grooves of the connecting link A 110 and the connecting link B 111 are connected by a pin to a connecting groove of the connecting link A 110 and the connecting link B 111, (120) and the lower clamp ring And a fixing groove formed in the center of the lower clamp link 130 and a fixing groove formed in the center of the lower clamp link 130, The workpiece 2 is fixed to the inside of the clamping device frame by the fixing pin 135 so as to be hinged around the axis of the fixing pin 135 and connected to the connection link groove formed on the other side by the pin, The clamp cylinder 101 is operated downward and the upper and lower clamp links 120 and 130 are hinged about the fixing pin 135 so that the upper clamp link 130 And the workpiece (2) is clamped between a V-shaped upper jaw portion (121) formed on one side of the lower clamp link (130) and a lower type V jaw A careful two-end machining machine is disclosed. The clamping device is configured to automatically center the diameter of the workpiece at the center of a line segment connecting between the two tools even if the diameters of the workpieces are different. However, since the front part of the clamp device is clogged Which is a problem in that it is not smoothly discharged.

To solve this problem, we developed a centering system that can uniformly center the material and easily discharge the material from the clamping device and adjust the rotation speed of the spindle according to the material of the material. .

Korean Patent Publication No. 10-2003-0041750

Accordingly, the present invention provides a clamping device for clamping a round bar and performing a clamping and unclamping operation, a left and right rotary tooling device for centering the cutting round bar clamped to the clamping device, a clamping device, And to provide a double-ended centering machine capable of constantly processing the centering position of a round bar used in the processing industry by using a control box with a PLC controller for circuit control.

In addition, a double-end centering machine capable of machining at a cutting speed most suitable for the material by operating the spindle by controlling the rotating speed of the spindle according to the material of the material, The purpose is to provide.

The centering machine comprises a clamping device for placing a round bar and performing a clamping and an unclamping operation, a clamping device for clamping the clamping device to the clamping device, And a control box having a PLC controller for controlling the sequential circuit of the clamp device and the left and right rotary tool devices.

The both-end centering machine according to the present invention includes a clamping device for placing a cut round bar and performing a clamping and an unclamping operation, a left and right rotating tooling device for centering the cutting round bar clamped to the clamping device, There is a remarkable effect that the centering position of the round bar used in the processing industry can be constantly formed by using the control box with the PLC controller for controlling the sequencer circuit of the tool unit, and a discharge device is additionally provided on one side of the clamp device So that the round rod material can be easily discharged and the rotation speed of the spindle can be adjusted according to the material of the workpiece, so that the machining can be performed at a cutting speed most suitable for the material.

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Fig. 2 is a plan view
3 is an unclamped state diagram of the clamping device according to the present invention
4 is a clamp diagram of the clamping device according to the present invention
Figs. 5 and 6 are views showing a configuration of a left and right rotary tool apparatus according to the present invention
7 is a block diagram of a control device according to the present invention

The present invention relates to a centering machine capable of automatically centering both ends of a cut round bar. More specifically, the centering machine includes a clamp device for placing a round bar and performing clamping and unclamping operations, Left and right rotary tool units for centering a cutting circular bar clamped to a clamping device, and a control box having a PLC controller for sequencer circuit control, a clamping device and left and right rotary tool devices.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is an unclamping state diagram of the clamping apparatus according to the present invention, FIG. 4 is a clamping state diagram of the clamping apparatus according to the present invention, and FIG. 5 and 6 are schematic views of the left and right rotary tool apparatuses according to the present invention. In the centering machine according to the present invention, both ends of a round bar are automatically centered, A left and a right rotary tool devices 20 and 30 for centering a round bar clamped to the clamp device 10 and a clamp device 10 for clamping the clamp device 10, And a control box (not shown) to which a PLC controller for sequence circuit control is attached is constituted by left and right rotary tool devices 20 and 30.

First, the clamping device 10 is a device for placing a material for centering processing, in particular, a clamped state by placing a cut round bar, or discharging a material after centering processing by unclamping the material. Left and right rotary tool units 20 and 30 for centering are provided so as to be capable of individually or simultaneously machining centering machining from both sides of the workpiece 2 in the center direction.

The clamping device 10 and the left and right rotary tool devices 20 and 30 are controlled by a control box to which a PLC controller for sequence circuit control is attached.

The clamp device 10 includes a base plate 11 provided on the upper surface of the bed 1 and a cylinder fixing block 12 installed on the base plate 11 for fixing the cylinder 13, A cylinder 13 which is fixed to the cylinder fixing block 12 and performs upward and downward movements so as to perform clamping and unclamping; and a connection link A (not shown) coupled to the cylinder rod 13a of the cylinder 13, A supporting block 16 fixed to the cylinder fixing block 12 and a connecting link B 15 fixed to the supporting block 16 and fixed to the connecting link A 14 at one side, An upper V-shaped block 17 fixed to the connection link A 14 to clamp the work according to the rotation of the connection link A 14, and a V-block 19 on which the work is placed.

3 is an unclamped state, and the state of FIG. 4 is a clamped state. In the state of FIG. 3, the cylinder rod 13a, which has entered the cylinder 13, The connecting link A 14 is rotated clockwise (CW) with reference to the drawing, whereby the upper V-groove 17 clamps the round bar on which the V-block 19 is seated.

At this time, one side of the connecting link B 15 is coupled to the supporting block 16 and the other side is coupled to the connecting link A 14, thereby uniformly maintaining the turning radius of the connecting link A 14.

At this time, the clamping force applied by the cylinder 13 must be maintained at a constant pressure until the work for the workpiece is completed. To this end, the cylinder must be pneumatically or hydraulically pressurized until clamping is completed .

Here, the protective cover 4 is a blocking plate for preventing chips generated by the centering process from protruding to the outside.

The V block 19 fixed to the base block 18, which is a constitution of the clamping device 10, has a central portion formed in an inclined or V-shape so that the center of the circular workpiece can perform a self-alignment function, As the clamping of the workpiece is performed through the tub 17, the center of the V block 19 is searched so that the workpiece can always be clamped to a fixed position. In the illustrated embodiment, And a separate support block 19a is additionally provided to increase the center point of the relatively small material.

A control device 40 for adjusting the height of the clamp device 10 is additionally provided at a lower portion of the clamp device 10. [

That is, since the center of gravity of the workpiece placed on the clamp device 10 varies depending on the diameter of the workpiece, the position of the base block 18 and the V block 19 in the clamp device 10 can be moved up and down It can be used universally for various workpieces.

To this end, one side of the clamp device 10 is additionally provided with a regulating device 40 as shown in FIG. 7, wherein the regulating device 40 comprises a driving cylinder 41 operated by hydraulic or pneumatic pressure, A cylinder rod 42 moved along the cylinder and coupled to the base block 18, a guide post 44 guiding the movement of the base block 18, And a spacer 43 inserted in the base block 18 to maintain the position of the base block 18.

Therefore, the height of the base block 18 is raised by allowing the cylinder rod 42 to come out of the cylinder 41, and the spacer 43 is inserted between the base block 18 and the bed 1, And the base block 18 is held in position by the cylinder rod 42. The base block 18 has a guide groove 18a at one side thereof for receiving the guide post 44 and is stably moved .

The spacer 43 has a constant height for each workpiece to be subjected to the centering process and is fitted in a ring shape having an approximately opened one side so as to surround a part of the outer circumferential surface of the guide post 44 so as to stably support the base block 18 .

In the case of a material having a relatively large outer diameter of the material, the thickness of the space 43 should be relatively large. Therefore, in the case of a material having a small outer diameter, the thickness of the space 43 must be reduced. Can be matched.

The left rotary tool device 20 includes an LM guide 21 fixed to the bed 1, a guide block 22 moved along the LM guide 21, A saddle 23, a driving motor 24 fixedly coupled to the saddle, a coupling 25 fixedly coupled to the motor shaft of the driving motor, and a spindle A spindle housing 27 configured to surround the outside of the spindle 26 to support rotation of the spindle 26, a tool arbor 5 coupled to one side of the spindle, And a cutting tool 3 fixed to the tool arbor 5.

Referring to FIGS. 5 and 6, when the left rotary tool 20 is driven, the workpiece is ready for machining. After the workpiece is placed on the V block 19, the workpiece is clamped by the clamp device 10 The left rotary tool unit 20 provided on the left side of the workpiece is moved to the workpiece along the LM guide 21 and the cutting tool 3 is brought into contact with the end surface of the workpiece, , And is moved away from the cross section of the material by a certain distance.

The right rotary tool unit 30 provided on the right side is moved to the workpiece along the LM guide 31. When the end face of the workpiece and the cutting tool 3 come into contact with each other, this state is recognized as a zero point, As shown in FIG.

Then, the left and right rotary tool devices 20 and 30 center the center of the workpiece at the same time or perform the processing one by one. Since the centering processing is performed based on the position measured by the zero point, At this time, the load value to be measured is measured and it is judged whether or not the material is defective in comparison with each other.

That is, the left rotary tool device 20 is configured such that the power of the drive motor 24 is transmitted to the spindle 26 via the coupling 25 and is fixed to the spindle 26 by a chuck or an arbor. When the centering of the workpiece is performed by the cutting tool 3, the load value is measured according to the cutting load, so that the measured value is stored as the reference value.

The next right turning tool unit 30 is also driven by the power of the drive motor 34 via the coupling 35 to the spindle 36 and the cutting tool fixedly coupled to the spindle 36 by a chuck or an arbor 3, when the centering of the workpiece is performed by the cutting tool 3, the load value is measured according to the cutting load. Therefore, the measured value is stored as a comparison value to be compared with the reference value The load value measured in the drive motor 24 of the left rotary tool 20 is compared with the reference value and the load value measured in the drive motor 34 of the right rotary tool 30, If it is judged to be out of the error range, it is regarded as a defective product.

The load value measured by the drive motor 24 of the left rotary tool device 20 is measured by the right rotary tool device 30 It is judged that breakage of the tool or shape of the workpiece is different or a heat treatment problem has occurred. In this case, the operation of the centering device is stopped to stop the workpiece It is confirmed that there is an abnormality.

The coupling 25 mounted on the left and right rotary tool devices 20 and 30 transmits the rotational force of the drive motors 24 and 34 to the spindle using a coarse coupling with a high elastic polyurethane element, The cutting tool 3 coupled to the spindle absorbs an instantaneous impact generated during centering of the workpiece to thereby alleviate impact.

The spindle 26 is supported by a bearing 29 fitted in the spindle housing 27 and has a lock nut on one side to prevent the spindle 26 from rotating against rotation, To bring the bearing into a preloaded condition.

The control box also allows the PLC and the electronic device installed therein to sense the detection sensors attached to the individual devices of the clamp device 10, the left and right rotary tool devices 20 and 30 and the adjustment device 40, In particular, the load value of the driving motor of the left rotary tool unit and the driving motor of the right rotary tool unit are compared with each other at every cycle, and whether or not the material is normally cut, that is, .

As a result, the both-end centering machine according to the present invention comprises a clamping device for restoring a round bar and performing a clamping and an unclamping operation, a left and right rotating tooling device for centering the cutting round bar clamped to the clamping device, There is a remarkable effect that the centering position of the round bar used in the processing industry can be constantly formed by using the control box with the PLC controller for sequential circuit control for the rotary tool unit on the left and right sides, It is easy to discharge the round bar material and the rotation speed of the spindle is adjusted according to the material of the workpiece, so that the machining can be performed at the most suitable cutting speed for the material.

1. Bed 2: Material
3. Cutting tool 4. Protective cover
5. Tool Arbor
10; Clamping device
11. Base plate 12. Cylinder fixing block
13. Cylinder 14. Connection link A
15. Connection link B 16. Support block
17. Upper V. 18. Base block
18a. Guide groove 19. V block
19a. Support block
20; Left rotary tool unit
21. LM Guide 22. Guide Block
23. Saddle 24. Drive motor
25. Coupling 26. Spindle
27. Spindle housing 28. Spindle holding block
29. Bearings 29a. Lock nut
30; Right rotating tool unit
31. LM Guide 32. Guide Block
33. Saddles 34. Driving motor
35. Coupling 36. Spindle
37. Spindle housing 38. Spindle holding block
39. Bearings
40; Regulator
41. Cylinder 42. Cylinder rod
43. Spacer 44. Guide post

Claims (6)

A centering machine configured to automatically center both ends of a round bar,
The centering machine includes a clamp device 10 for seating a round bar and performing a clamping and an unclamping operation, left and right rotating tool devices 20 and 30 for centering a round bar clamped to the clamp device 10, The clamp device 10 and the left and right rotary tool devices 20 and 30 are constituted by a control box having a PLC controller for sequence circuit control,
A control device 40 is additionally provided at one side of the clamp device 10 and the control device 40 includes a drive cylinder 41 driven by hydraulic or pneumatic pressure, A guide post 44 for guiding the movement of the base block 18 and a guide post 44 inserted between the base block 18 and the bed 1 to support the base block 18, And a spacer (43) for maintaining the position of the spacer (43).
The method according to claim 1,
The clamp device 10 includes a base plate 11 provided on the upper surface of the bed 1, a cylinder fixing block 12 provided on the base plate 11 for fixing the cylinder 13, A cylinder 13 which is fixed to the fixed block 12 and performs upward and downward movements so as to perform clamping and unclamping; and a connection link A (14) coupled to one side of the cylinder rod 13a of the cylinder 13 A supporting block 16 fixed to the cylinder fixing block 12 and a connecting link B 15 fixed at one side to the supporting block 16 and fixed at the other side to the connecting link A 14, , An upper V-shaped block (17) fixedly coupled to the connecting link (A) (14) and clamping the work according to the rotation of the connecting link A (14), and a V- machine.
The method according to claim 1,
The left rotary tool device 20 includes an LM guide 21 fixed to the bed 1, a guide block 22 moved along the LM guide 21, A saddle 23, a driving motor 24 fixedly coupled to the saddle, a coupling 25 fixedly coupled to the motor shaft of the driving motor, and a spindle A spindle housing 27 configured to surround the outside of the spindle 26 to support rotation of the spindle 26, a tool arbor 5 coupled to one side of the spindle, And a cutting tool (3) fixed to the tool arbor (5).
delete The method according to claim 1,
The left rotary tool device 20 is configured such that the left rotary tool device 20 provided on the left side of the workpiece is supported by the LM guide 20 after the workpiece is placed on the V block 19 and then clamped by the clamp device 10, Is moved to the workpiece along the workpiece (21), and recognizes this state as a zero point when the cutting tool (3) abuts the end face of the workpiece, and moves away from the end face of the workpiece by a certain distance.
The method according to claim 1,
The left and right rotary tool units 20 and 30 center the center of the workpiece at the same time or perform processing one by one, and measure the load value at this time and judge whether the workpiece is defective or not, .

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