JP3385401B2 - Pallet replacement method and device for machine tool - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pallet changing method and device for machine tools, and more specifically, when exchanging a discharge pallet and a supply pallet, it is possible to discharge and supply the pallet at the same time to shorten the pallet exchange time. The present invention relates to a machine tool pallet changing method and apparatus.

[0002]

2. Description of the Related Art Generally, a pallet used in a machine tool is a kind of work carrier for exchanging a machined work and a non-machined work. Various types of devices are known. FIG. 15 shows an example of a conventional pallet exchanging device. This pallet exchanging device has a spindle 40.
01, a pallet P on which a machined workpiece positioned on a table 4002 that moves two-dimensionally is placed,
In a pallet exchanging device for a machine tool, which is located outside the table 4002 and exchanges a pallet P on which an unprocessed workpiece is placed, an arm member 4003 is rotatably attached to the table 4002. The free end of the arm member 4003 is engageable with the groove formed in the pallet P, and the rotation of the arm member 4003 moves the pallet P from the table to the standby position outside the table.

The pallet exchange performed by using the conventional pallet exchange device thus constructed proceeds as follows. That is, as shown in FIG. 16, first, a pallet discharging process in which the pallet P on which the machined workpiece is placed (hereinafter referred to as a discharging pallet) is discharged to the first auxiliary table 4004 by the rotation of the arm member 4003. 401
1, a table reverse process 4012 in which the table moves backward to receive a pallet P on which an unprocessed workpiece is placed (hereinafter referred to as a supply pallet), and the arm member 400.
By the reverse rotation of 3, the discharge pallet and the supply pallet are exchanged in each step of the pallet supply step 4013 in which the supply pallet P placed on the second auxiliary table 4005 is placed on the upper side of the table 4002.

However, the conventional pallet exchanging device constructed and operated as described above has a discharging process 40 of discharging pallets.
11, the backward movement process 4012 of the table and the feeding process 4013 of the pallet are exchanged, but since the backward movement process 4012 of the table is performed after the pallet discharging process 4013 is completed, the pallet is changed. It has a problem that it takes a long time.

[0005]

SUMMARY OF THE INVENTION Therefore, the present invention has been made to solve the above-mentioned conventional problems, and raises the pallet on which the machined workpiece is placed and simultaneously raises the table. It is an object of the present invention to provide a pallet changing method and device for a machine tool, which can reduce the pallet changing time by simultaneously discharging and supplying the pallet after moving backward to the supply position. Further, it is an object of the present invention to provide a highly accurate pallet transfer device by using mutually symmetrical first and second chains in transferring pallets by the first and second lift devices.

Further, it is an object of the present invention to obtain a highly accurate tilting operation by mounting a tilting angle rotating part on the guide and operating the tilting angle rotating part via another tilting arm. . In addition, when the discharged and supplied pallets are clamped on the table and the auxiliary table, the work is performed by using the boarding / alighting parts mounted on the first and second lift devices and the fixing parts mounted on the first and second guides. Its purpose is to prevent the clearance of the chain from changing the clamping position of the pallet during the operation of the machine.

The first and second rails formed on both sides of the rail
The inclined surface and the third and fourth inclined surfaces of the movable bracket are closely attached to each other, and oil is supplied to the space formed between the upper surface of the rail and the lower surface of the movable bracket so that the oil flows to the inclined surface. The purpose is to prevent the moving bracket and the rail from being worn due to lack of oil when the moving bracket is moved. Further, when maintaining the horizontal state of the pallet, the upper surface of the seat portion mounted on the table and the lower surface of the seat portion mounted on the pallet are brought into surface contact with each other so that the horizontal state is adjusted. The purpose is to prevent the expense of this amount by eliminating the need for precision machining of the inclined portion.

It is another object of the present invention to prevent the upper surface of the seat portion and the lower surface of the seat portion from being worn to prevent the horizontal state of the pallet from being changed during the exchange of the pallet. In addition, a space is formed inside the clamp insertion holder in which the pallet is mounted so that a shock can be absorbed when the clamping unit mounted on the table is inserted into the clamp insertion holder. The purpose is to prevent the clamping part from being easily damaged.

[0009]

SUMMARY OF THE INVENTION The present invention for achieving the above object is achieved by operating a cylinder of a tilting means in a pallet changing device including first and second lift devices, a tilting means and a transfer means. The front and rear guide bars are rotated by a certain angle, and the discharge and supply pallets are lifted higher than the table by the levers of the first and second lift devices to move the table to the pallet supply position backwards. A pallet transfer process in which the motor of the transfer means is operated to position the discharge pallet above the auxiliary table, and the supply pallet is positioned above the table that has moved backward to the supply position; and the first and second lift devices and the till. The pallet clamping unit that clamps the discharge and supply pallets to the auxiliary table and the table After the table moves forward and backward, the chain-driven drive motor reversely rotates, so that the levers of the first and second lift devices are lifted by the operation of the tilting means and returned to their original positions. And a pallet changing method for a machine tool, in which the pallet is changed by returning again and returning the first and second lift devices to the initial position.

Further, according to the present invention for achieving the above-mentioned object, it is installed at a symmetrical position in front of the table and behind the pallet standby space, and is mounted on both sides of the movable bracket and the movable bracket to support both sides thereof. First and second lift devices including a lever, a tilting arm installed on one side of the discharge space and the standby space, equipped with a cylinder, and installed to rotate a guide bar, and the front and rear of the tilting arm. And a first and second lifting device, the tilting device being installed on one side and rotating a moving bracket of the first and second lifting devices to lift a pallet and sliding the moving bracket. Between them, and they are applied via a motor and a sprocket to move the first and second lift devices symmetrically with each other. Providing pallet exchange device configured machine tools and a transfer means comprising a chain to.

[0011]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a plan view showing a pallet changing device of the present invention, and FIG. 2 is a side view showing the pallet changing device of the present invention. In the present invention, a table 2 that moves two-dimensionally is provided in front of the main shaft 1, and a discharge space 3 in which an auxiliary table 31 is provided is provided on one side of the table 2 and behind the pallet discharge space 3. In a machine tool having a pallet standby space 4, the movable brackets 51, 61 and the movable brackets 51, 6 are installed symmetrically in front of the table 2 and rearward of the pallet standby space 4.
Levers 52 mounted on both sides of 1 to support both sides thereof,
First and second lift devices 5 and 6 each including 62, and a tilting arm 10 on one side of the discharge space 3 and the standby space 4.
A guide bar 1 in which a cylinder 101 for moving forward and backward 2 is mounted, an end of the tilting arm 102 is fixed to the front and rear, and the moving brackets 51 and 61 are mounted.
Connecting the first and second lift devices 5, 6 to each other by connecting the first and second lift devices 5, 6 with each other, and connecting the first and second lift devices 5, 6 with each other through a motor 72 and a sprocket 73. The transfer means 7 is composed of a chain 71 that moves symmetrically.

Around the table forming the machine tool,
A cover 21 is provided to prevent chips from scattering outside during processing. As shown in FIG. 3, both side widths L1 of the table 2 and the auxiliary table 31 are the same, and both side widths L2 of the pallet P are the same as those of the tables 2 and 3.
It is formed relatively longer than the width L1 on both sides of 1. Further, below the supply and discharge pallet P, lever insertion portions P1 are formed on both sides so that the levers 52 and 62 can be inserted, and the distance L3 between the lever insertion portions P1 of this pallet P is the first. It is formed shorter than the inner distance L4 between the levers 52 forming the two lift devices 5 and 6. Therefore, as shown in FIG. 2, the first and second lift devices 5 and 6 and the tilting means 1 are provided.
The levers 52 and 62 forming the first and second lift devices 5 and 6 do not collide with the table when the pallet P is moved up after being raised by 0, or vice versa.

Hereinafter, a method of exchanging pallets by using the pallet exchanging device thus constructed will be described. As shown in FIGS. 1 to 4, in the case of discharging the discharge pallet P on which the work finished by the machine tool is placed and supplying the supply pallet P on which a new work is placed,
First, the cylinder 101 forming the tilting means 10 is operated to raise the center of the tilting arm 102. The guide bar 103 installed at the front and rear is rotated by a certain angle, and the discharge and supply pallet P is lifted higher than the table 2 by the levers 52 and 62 of the first and second lift devices 5 and 6, and the table 2 is supplied to the pallet. After the discharge and supply preparation process (100) for moving backward to the position and the end of the discharge and supply preparation process, the motor 72 of the transfer means 7 is operated to position the discharge pallet P on the upper side of the auxiliary table 31 and the supply pallet P. Is a pallet transfer process (110) for locating the pallet on the upper side of the table 2 which is moved backward to the supply position, and the first and second lift devices 5, 6 after the pallet transfer process is completed.
And the pallet P is discharged and discharged by the tilting means 10.
A pallet clamping process (120) for clamping the table to the auxiliary table 31 and the table 2, and after the clamping process is completed, the table moves forward and backward, and at the same time, the drive motor 72 with which the chain 71 is engaged reversely rotates. , The levers 5 of the first and second lift devices 5, 6
The return process (13) in which the second and second lift devices 5 and 6 are returned to their initial positions after being raised by the operation of the tilting means 10 to return to their original positions and then lowered again.
The pallet is exchanged with 0). Such a process is repeatedly performed during machining of the machine tool, and the above-described process constitutes one cycle.

5 to 7 show another embodiment of the pallet changing device of the present invention. FIG. 5 is a plan view, FIG. 6 is an enlarged sectional view taken along line BB of FIG. 5, and FIG. Is C- in FIG.
It is sectional drawing about the C line.

The pallet exchanging device of this embodiment is provided with a table 2 which moves two-dimensionally in front of a main shaft 1, and a pallet discharging space 3 in which an auxiliary table 31 is installed on one side of the table 2. In a machine tool provided with a pallet standby space 4 in which an auxiliary table 41 is installed behind the pallet discharge space 3, the movable bracket 51 is installed symmetrically in front of the table 2 and behind the pallet standby space 4. , 61 and the moving brackets 51, 61
Mounted on both sides of the first and second lift devices 5 and 6 including levers 52 and 62 supporting both sides, and mounted on the lower side of the moving brackets 51 and 61 to guide the lateral movement of the moving bracket 51. And projecting pins 11 on both sides backward
Tilting angle rotation unit 1 in which 11, 1211 are formed
First and second guides 1001 including 011 and 1021,
1002 and the first and second guides 1001 and 1002 on the lower front side, the tilting angle rotation cylinder 1031 is mounted and connected to the rods of the cylinder 1031, and the tilting arms 10 located on both sides.
Located between the tilting means 1003 composed of 32 and the first and second lift devices 5 and 6 in a symmetrical state,
First, second and third sprockets 1041, 1042, 104
3 and a transfer means 1004 including first and second chains 1045 and 1046 connected by a forward / reverse motor 1044.

A tilting cam 1033 is provided in the middle of the tilting arm 1032 forming the tilting means 1003 so that the protruding pins 1111 and 1211 mounted behind the tilting angle rotating parts 1011 and 1021 can be pressed. The left and right movements of the inclined cam 1033 are operated by the cylinder 1031 formed on one side. In addition, the tilting angle rotation units 1011 and 10
21 has a rotating shaft 1112, 1212 penetrating laterally therein.
Since the protrusion pins 1111 and 1211 are pressed, the rotary pongers 1112 and 1212 are attached.
The tilting angle rotation units 1011 and 1021 are rotated about the lever, and the levers 52 of the first and second lift devices 5 and 6,
62 lifts the pallet P.

In the middle of the first and second chains 1045 and 1046, which connect the first and second lift devices 5 and 6 symmetrically, tension springs 1451 and 1461 for compensating for wear of the chains are attached. It When the first and second lift devices 5 and 6 move inside the second and third sprockets 1042 and 1043, they contact the moving brackets 51 and 52 to control the operation of the forward / reverse motor 1044. Limiter switches 1047 and 1048 for notifying the timing of supplying oil to the first and second lift devices 5 and 6 are mounted.

Inside the tilting angle rotating parts 1011 and 1021 of the first and second guides 1001 and 1002, oil inflow pipes 1113 and 1213 are connected, so that lubricating oil can be supplied to both side walls and upper surfaces. Oil supply holes 1114 and 1214 are provided. The operation of the pallet exchanging device configured as described above will be described below with reference to FIGS.

In the case of discharging and supplying the discharge pallet P on which the work finished by the machine tool is placed and the supply pallet P on which the new work is placed, first, the cylinder forming the tilting means 1003. 1031 is operated and the tilting cam 1033 installed at the center of the tilting arm 1032 is moved forward. As a result, the protruding pins 1111 and 1211 mounted behind the tilting angle rotation units 1011 and 1021 are pressed. Therefore, the tilting angle rotation parts 1011 and 1021 located on both sides of the first and second guides 1001 and 1002 are rotated about the rotation shafts 1112 and 1212 which are penetrated therein, and the tilting angle rotation parts 1011 and 1021 are formed. The discharge and supply pallets P are raised above the table 2 by the levers 52 and 62 of the connected first and second lift devices 5 and 6.

Next, the forward / reverse motor 10 on which the first and second chains 1045, 1046 of the transfer means 1004 are engaged.
44 is operated to position the discharge pallet P on the upper side of the auxiliary table 31, and at the same time, the supply pallet P is positioned on the upper side of the table 2 moved backward to the supply position. After finishing the pallet transfer process, the first and second lift devices 5,
6 and the tilting means 1003 discharge and supply the pallet P to the table 2 and the auxiliary table 31 by clamping.

After the clamping process is completed, the table moves forward and backward, and at the same time, the first and second chains 1045,
When the forward / reverse motor 1044 with which the 1046 is engaged is reversely rotated, the levers 52 of the first and second lift devices 5 and 6,
62 is a cylinder 1031 of the tilting means 1003.
The pallet is replaced by the process of ascending, returning to the original position and then descending, and returning the first and second lifting devices 5 and 6 to the initial position.

On the other hand, FIGS. 8 to 11 show still another embodiment of the pallet changing device according to the present invention, FIG. 8 is a schematic plan view showing the pallet changing device of the present invention, and FIG. 9 is shown in FIG.
10 is a sectional view taken along line D-D in FIG. 10, FIG. 10 is an enlarged view of portion E in FIG. 9, and FIG. 11 is a schematic perspective view showing a guide according to the present invention. In this embodiment, the first and second guides 1001 and 10 are used.
A fixed portion 2001 having an inclined insertion portion 2013 formed on an upper portion is attached to an outer middle of an inner partition wall 2012 formed in the angular rotation portion attachment grooves 2011 located on both sides of the movable bracket 51, 61. In the middle, a boarding / alighting section 2002 having an inclined groove section 2021 formed so as to be inserted into the fixing section 2001 is mounted.

A stopper S for preventing the pallet P from slipping when the pallet P is tilted is mounted in the upper middle of the levers 52 and 62 mounted on the movable brackets 51 and 61. In addition, the pallet discharge space 3 has a large number of pallet seats 311 and 411.
Auxiliary tables 31 and 41 provided with are attached to the pallet seats 311 and 411, for removing chips on the pallet P, air lines 312 and 412 connected to an air compressor (not shown). Is installed.

In particular, the fixed part 2001 is mounted on the inner partition wall 2012 of the angular rotation part mounting groove 2011 formed on both sides of the first and second guides 1001, 100 and 2.
The inclined insertion portion 2013 formed in the upper portion is formed with an inclined surface having a side inclination angle T1 on both sides of the center line c and a front inclination angle T2 inclined downward to the front. . That is, the forward inclination angle T2 is equal to
The inclined groove portion 2021 of 02 is formed so as to be easily inserted while descending from the front.

Then, it is attached to the center of the lower surface formed inside the boarding / alighting section 2002 moving brackets 51 and 61, and the inclined groove section 2021 formed in the lower section is depressed about the center line c, An inclined surface (2021) having a side inclination angle T3 on both sides and a front inclination angle T4 inclined downward is formed on the front side. That is, the inclined insertion portion 2013 and the boarding / alighting portion 2002 of the fixed portion 2001.
Side inclination angles T1, T3 and T2, T4 of the inclined groove portion 2021 of
Are formed at the same angle with each other.

The operation relationship of the pallet transfer device will be described below with reference to FIGS. First, in the case of discharging the discharge pallet P on which the machined work is placed and simultaneously supplying the supply pallet P on which a new work is placed, at the moment when the front of the lever descends, 1,
The inclined groove portion of the entry / exit portion 2002 attached to the moving brackets 51 and 61 of the two lift devices 5 and 6 is coupled to the inclined insertion portion 2013 of the fixed portion 2001 attached to the first and second guides 1001 and 1002. That is, the boarding / alighting section 2
At the time when the inclined groove portion 2021 of 002 is coupled to the inclined insertion portion 2013 of the fixing portion 2001, the inclined groove portion 202 is
Since the first inclined surface descends along the inclined surface of the inclined insertion portion 2013, the clamping positions of the first and second lift devices 5 and 6 can be accurately set.

First and second inclined surfaces 2032 and 2033 are formed on both sides of the upper surface 2031 of the rail 2003 formed on the first and second guides 1001 and 1002 to form the first and second lift devices 5 and 6. Moving brackets 51, 6
On both sides of the lower surface 2004 formed inside 1, first and second inclined surfaces 2032 and 2033 are closely attached, and third and fourth inclined surfaces 2041 and 2042 are formed.
3, a large number of oil supply holes 2034 are formed vertically, and the upper surface 2031 of the rail 2003 and the moving bracket 5
A space portion 2005 is formed between the lower surface 2004 of the first and the first portions 61 to retain the oil introduced from the oil supply hole 2034.

Therefore, the first and second inclined surfaces 2032 and 2033 formed on both sides of the rail 2003 and the third and fourth inclined surfaces 2041 and 204 of the moving brackets 51 and 61 are formed.
2 is closely attached, and oil is supplied to the space portion 2005 formed between the upper surface of the rail 2003 and the lower surface 2004 of the moving brackets 51 and 61. The wear of the moving brackets 51 and 61 and the rail 2003 can be minimized. In addition, a bearing 2006 is inserted on the lower inclined surface and one side surface of the moving bracket so as to prevent uneven wear due to an unbalanced load generated in the rail 2003.

FIG. 12 is a plan view showing the pallet clamp device of the present invention, FIG. 13 is a sectional view taken along the line FF of FIG. 12, and FIG. 14 is an enlarged view of a portion G of FIG. In this device, a clamping unit 3001 for centering the pallet P is mounted in the center of the table 2, and an insertion bracket 3011 is mounted thereon. A plurality of sheet portions 3002 each having an upper surface 3021 having the same degree of horizontalness is formed at each corner of the upper portion. One side of the clamping portion 3001 has an outer diameter to prevent rotation of the pallet P. Insertion part 3003 in which the inclined part 3031 is formed
, And a clamp insertion holder 3014 coupled to the insertion bracket 3011 of the clamping unit 3001 is attached to the center of the lower portion of the pallet P, and each corner of the lower portion is in close contact with the upper surface 3021 of the sheet unit 3002. A seating portion 3004 having a lower surface 3041 is formed on one side of the clamp insertion holder 3014.
No. 03 is inserted, an insertion holder 3005 having an inclined portion 3051 formed on the inner diameter is attached.

The lower surface of the seating portion 3004 and the upper surface of the pallet P mounted on the lower corners of the pallet P are parallel to each other. Therefore, at the time when the supply pallet P is fixed to the table 2 after the transfer of the pallet P is completed, the lower surface 3041 of the seat portion 3004 attached to each corner of the lower part of the supply pallet P is located above the table 2. It is placed on the upper surface 3021 of the seat portion 3002 attached to each corner portion. That is, the lower surface 3041 of the seat portion 3004 and the upper surface 3021 of the seat portion 3002 are in surface contact with each other.

At the same time, the insertion portion 3003 mounted on one side of the center of the pallet P is coupled to the insertion holder 3005 mounted on the one side of the center of the table 2, so that the moment generated on the pallet during processing is increased. Prevent the pallet from rotating.

On the other hand, as shown in FIG. 14, an inserting bracket 3011 having an inserting inclined portion 3111 for aligning the center is formed on the upper side of the clamping portion 3001.
, And a fixed inner diameter d1 and a height h so that the insertion bracket 3011 is inserted into the center of the clamp fixing portion 3012 attached to the lower center of the pallet P.
1 is formed with a holder insertion groove portion 3013. In the holder insertion groove portion 3013, an inclined groove portion 3141 is formed so that the insertion inclined portion 3111 is inserted into the insertion groove portion 3013, and a protruding portion 3142 is formed on the upper portion. The formed clamp insertion holder 3014 is attached.

The outer diameter d2 of the protrusion 3142 formed on the clamp insertion holder 3014 is equal to the holder insertion groove 3
Since the inner diameter d1 of 013 is relatively smaller and the height h2 of the protruding portion 3142 is also lower than the height h1 of the holder insertion groove portion 3013, the inner surface of the holder insertion groove portion 3013 and the clamp insertion holder 3014 are formed.
A space portion 3015 capable of absorbing shock is formed between the outer surface and the outer surface.

Therefore, when the pallet P is placed on the table 2, when the clamp insert holder 3014 attached to the pallet P is coupled to the insert bracket 3011 attached to the table 2, the clamp insert holder 3 is attached.
The shock of 014 is absorbed by the space 3015. Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely an example, and a person having ordinary knowledge in the art can make various modifications and equivalents. It goes without saying that the embodiment of can be taken.

[0035]

As described above, the present invention shortens the pallet exchange time by raising the pallet and simultaneously moving the table backward to the supply position so that the pallet can be discharged and supplied at the same time. There are possible effects. Further, when the pallets are transferred by the first and second lift devices, the symmetric first and second chains are used, so that the accuracy of the pallet transfer device can be improved. In addition, the tilting angle rotation unit is mounted on the guide, and only the tilting angle rotation unit can be separately operated, so that the accuracy of the tilting operation can be improved. Also, when clamping the pallet to be discharged and supplied to the table and the auxiliary table, it is possible to prevent the pallet clamping position from being changed due to the play of the chain, and to reduce the machining accuracy due to the pallet clamping position change. It has a preventable effect. Further, oil is supplied to the space formed between the upper surface of the rail and the lower surface of the moving bracket, and there is an effect that abrasion of the moving bracket and the rail due to insufficient oil can be prevented when the moving bracket moves.

Further, by aligning the horizontal state of the pallet with the horizontal sheet portion and the seating portion mounted on the table and the pallet, the conventional expense for precision machining of the inclined portion can be eliminated, and the pallet can be manufactured at low cost. Besides, there is an effect that the accuracy of the table and the pallet can be improved. Further, by preventing abrasion of the upper surface of the seat portion and the lower surface of the seat portion and preventing the horizontal state of the pallet from being changed during the exchange of the pallet, the machining accuracy of the machine tool is lowered during the operation of the device. It has the effect of preventing this. Further, when the pallet is mounted on the table, it is possible to prevent the clamp fixing portion and the clamping portion from being easily damaged by absorbing the impact and aligning the positions of the centers.

[Brief description of drawings]

FIG. 1 is a plan view showing a pallet changing device of the present invention.

FIG. 2 is a side view showing the pallet changing device of the present invention.

FIG. 3 is a cross-sectional view taken along the line AA in FIG.

FIG. 4 is a block diagram showing an operation process of the pallet changing device according to the present invention.

FIG. 5 is a plan view showing another embodiment of the pallet changing device according to the present invention.

6 is an enlarged cross-sectional view taken along the line BB of FIG.

7 is a cross-sectional view taken along the line CC of FIG.

FIG. 8 is a plan view showing still another embodiment of the pallet changing device according to the present invention.

9 is a cross-sectional view taken along the line DD of FIG.

10 is an enlarged view of a portion E in FIG.

FIG. 11 is a schematic perspective view showing a guide according to the present invention.

FIG. 12 is a plan view showing a pallet clamp device of the present invention.

13 is a cross-sectional view taken along the line FF of FIG.

FIG. 14 is an enlarged view of part G in FIG.

FIG. 15 is a plan view showing a conventional pallet changing device.

FIG. 16 is a block diagram showing an operation process of a conventional pallet changing device.

[Explanation of symbols]

1 spindle 2 tables 21 cover 3 Pallet discharge space 31 Auxiliary table 311 Pallet seat 312 airlines 4 pallet waiting space 41 Auxiliary table 411 Pallet seat 412 airlines 5 First lift device 51 moving bracket 6 Second lift device 61 Moving bracket 7 Transfer means 71 chains 72 motor 10 Tilting means 101 cylinder 102 tilting arm 103 Guide bar 1001 First Guide 1011 Tilting angle rotation part 1111 protruding pin 1112 rotation axis 1113 Oil inflow pipe 1114 Oil supply hole 1002 Second guide 1021 Tilting angle rotation part 1211 protruding pin 1212 rotation axis 1213 Oil inflow pipe 1214 Oil supply hole 1003 Tilting means 1031 cylinder 1032 tilting arm 1004 Transfer means 1044 forward / reverse motor 1045 1st chain 1046 2nd chain 1451 tension spring 1046 2nd chain 2011 Square rotation part mounting groove 2021 inclined groove 2003 rail 2032 First inclined surface 2033 Second inclined surface 2034 Oil supply hole 2004 lower surface 2041 third inclined surface 2042 Fourth inclined surface 2005 Space 3001 Clamping unit

─────────────────────────────────────────────────── ─── Continuation of the front page (31) Priority claim number 1999 / P10825 (32) Priority date March 29, 1999 (March 29, 1999) (33) Country of priority claim Korea (KR) (72) inventor Kim Chang Yong South Korea Kaonzuu City Kaonsan District Zandokuhora 976-1 (72) inventor Li Min Son South Korea Kaonzuu City Kaonsan District Zandokuhora 976-1 (58) investigated the field (Int.Cl. ^7, DB name) B23Q 7/00

Claims (17)

(57) [Claims] 1. A pallet changer comprising a first and second lift device, a tilting means for tilting the first and second lift devices, and a transfer means for transferring the first and second lift devices. Cylinder (101) forming (10)
To raise the center of the tilting arm (102) to move the guide bar (1
03) is rotated at a constant angle, and the discharge and supply pallet (P) is moved to the lever (5) of the first and second lift devices (5, 6).
2, 62) to raise it higher than the table (2), and the table (2) moves backward to the pallet supply position, and the discharge and supply preparation process (100) and the motor (72) of the transfer means (7) are operated. The discharge pallet (P) is positioned above the auxiliary table (31), and the supply pallet (P) is positioned above the table (2) which is moved backward to the supply position.
10), and a pallet clamping process for clamping the discharge / supply pallet (P) to the auxiliary table (31) and the table (2) by the first and second lift devices (5, 6) and the tilting means (10). (120) and at the same time when the table moves forward and backward, the chain (71)
The reverse rotation of the drive motor (72) applied with the lever causes the lever (5) of the first and second lift devices (5, 6) to rotate.
2, 62) is lifted by the operation of the tilting means (10) to return to its original position and then lowered, so that the first and second lift devices (5, 6) are returned to their initial positions. A pallet exchanging method for a machine tool, characterized in that the pallet is exchanged by a returning process (130). 2. A discharge space (3) provided with a two-dimensionally movable table (2) in front of the main shaft (1) and an auxiliary table (31) provided on one side of the table (2).
And a pallet standby space (4) behind the pallet discharge space (3), the front of the table (2) and the pallet standby space (4).
Is installed in a symmetrical position behind the moving bracket (51,
61) and first and second lift devices (5, 6) that are mounted on both sides of the moving bracket (51, 61) and support the both sides of the moving bracket (51, 61), and the pallet discharge space (3). ) And pallet waiting space (4)
A cylinder (101) for moving the tilting arm (102) forward and backward is mounted on one side, and an end portion of the tilting arm (102) is fixed to the front and rear, and the moving bracket (51, 61) is mounted. Means (10) provided with a guided guide bar (103)
And the first and second lift devices (5, 6) are connected to each other, and the first and second lift devices (5, 6) are symmetrically connected to each other by a motor (72) and a sprocket (73). A pallet changing device for a machine tool, which comprises a transfer means (7) including a chain (71) for moving the pallet to a lower position. 3. A pallet changer for a machine tool according to claim 2, wherein a cover (21) is provided around a table forming the machine tool to prevent chips from scattering outside during machining. apparatus. 4. The table (2) and the auxiliary table (3)
The widths (L1) of both sides of 1) are the same, and the widths (L2) of both sides of the pallet (P) are the same as those of the table (2, 31).
Is relatively longer than the width (L1) on both sides of the pallet (P), and the lever insertion portions (P1) are formed on both lower sides of the pallet (P). The distance (L3) between the lever insertion portions (P1) is the first,
The pallet changing device for machine tools according to claim 2, wherein the pallet changing device is formed so as to be shorter than an inner distance (L4) between the levers (52) forming the two lift devices (5, 6). 5. The pallet (P) is prevented from slipping during the tilting of the pallet (P) in the upper middle of the levers (52, 62) mounted on the moving brackets (51, 61). The pallet changing device for machine tools according to claim 2, wherein a stopper (S) is mounted. 6. The auxiliary table (31, 41) includes:
A large number of pallet seats (311, 411) are installed,
An air line (312, 412) connected to an air compressor is attached to the pallet seating portion (311, 411) to remove chips on the pallet (P). A pallet changing device for the machine tool described. 7. A clamping part (3001) is mounted in the center of the table (2), an insertion bracket (3011) is mounted on the clamping part (3001), and the respective corners of the upper part have the same horizontal level. A plurality of sheet parts (3002) having an upper surface (3021) are formed on the clamping part (30).
01) on one side, the insertion part (300) which prevents the pallet (P) from rotating and has an inclined part (3031) formed on the outer diameter.
3) is mounted, and the pallet (P) has a lower center portion,
Inserting bracket (3) of the clamping unit (3001)
011) clamp insert holder (3014)
Is attached, and the seat portion (300
A seating portion (3004) having a lower surface (3041) that is in close contact with the upper surface (3021) of (2) is provided at one side of the clamp insertion holder (3014) with the insertion portion (3003).
Insert holder (3) having an inclined portion (3051) formed in its inner diameter.
005) is mounted, The pallet exchange device for machine tools of Claim 2 characterized by the above-mentioned. 8. An insertion slanted part (3111) for aligning a center on the upper side of the clamping part (3001).
The insertion bracket (3011) formed with is attached,
A holder insertion groove portion (3013) having a constant inner diameter (d1) and a height (h1) is formed in the center of the clamp fixing portion (3012) attached to the lower center of the pallet (P). A clamp insertion holder (3014) having an inclined groove (3141) formed in (3013) and a protrusion (3142) formed in the upper part is attached,
The machining part according to claim 7, wherein a space (3015) capable of absorbing impact is formed between an inner surface of the holder insertion groove (3013) and an outer surface of the clamp insertion holder (3014). Machine pallet changer. 9. A pallet discharge space (3) in which a table (2) that moves two-dimensionally is installed in front of the main shaft (1) and an auxiliary table (31) is installed on one side of the table (2). ), And a pallet standby space (4) in which an auxiliary table (41) is installed behind the pallet discharge space (3), the front of the table (2) and the pallet standby space. It is installed in the symmetrical position behind (4), and the moving brackets (51, 6)
1) and first and second lift devices (5, 6) each of which includes a lever (52, 62) mounted on both sides of the moving bracket (51, 61) and supporting both sides, and the moving bracket (51, 61). ) Is attached to the bottom
The first and second guides (1001, 1001) including a tilting angle rotation unit (1011 and 1021) which guides the left and right movement of the moving bracket (51) and has protruding pins (1111 and 1211) formed on the opposite sides thereof. 1002) and the first and second guides (1001, 1002) on the lower front side, and the tilting angle rotation part (1011,
A cylinder (1031) is mounted on one side so as to press the projecting pins (1111, 1211) of the (1021), is connected to the rod of this cylinder (1031), and is composed of tilting arms (1032) located on both sides. The tilting means (1003) and the first and second lifting devices (5, 6) are symmetrically positioned, and the first, second, and third sprockets (1041, 104).
2, 1043) and a transfer means (1004) composed of first and second chains (1045, 1046) connected by a forward / reverse motor (1044). 10. The tilting means (1003).
In the middle of the tilting arm (1032)
A tilting cam (1033) is provided so that the protruding pins (1111, 1211) mounted behind the tilting angle rotation unit (1011, 1021) can be pressed, and the tilting angle rotation unit (1011, 1021). The pallet changing device of a machine tool according to claim 9, wherein a rotating shaft (1112, 1212) penetrating laterally is installed inside the machine. 11. First and second chains (1045, 10) connecting the first and second lift devices (5, 6) symmetrically.
The pallet changing device of a machine tool according to claim 9, wherein a tension spring (1451, 1461) for compensating for wear of the chain is installed in the middle of 46). 12. The second and third sprockets (104)
2, 1043) inside the first and second lift devices (5,
When 6) moves, it is in contact with the moving brackets (51, 52) to control the operation of the forward / reverse motor (1044) and notify the first and second lift devices (5, 6) when to supply oil. 10. The pallet changing device for machine tools according to claim 9, wherein switches (1047, 1048) are mounted. 13. The first and second guides (1001, 10)
02) tilting angle rotation unit (1011, 102)
Inside of 1), oil inflow pipes (1113, 1213)
10. The pallet changing device of a machine tool according to claim 9, further comprising: oil supply holes (1114, 1214) for supplying lubricating oil to both side walls and an upper surface thereof. 14. The first and second guides (1001, 10)
No. 02), the inner partition wall (2012) formed in the angular rotation portion mounting grooves (2011) located on both sides of the fixed rotation portion (200) has an inclined insertion portion (2013) formed on the upper portion thereof.
1) is mounted, and an inboard portion (200) in which an inclined groove (2021) is formed in the middle of the inside of the moving bracket (51, 61) so as to be inserted into the fixed portion (2001).
10. The pallet changing device for machine tools according to claim 9, wherein 2) is mounted. 15. The center line (c) is attached to the inclined insertion part (2013) formed on the upper part of the fixing part (2001).
The inclined surface having a side inclination angle (T1) on both sides and a forward inclination angle (T2) inclined downward to the front is formed, and the inclination formed at the lower part of the boarding / alighting section (2002). An inclined surface (2021) having a side inclination angle (T3) on both sides and a front inclination angle (T4) inclined downward is formed in the groove, centered on the center line (c). , A side inclination angle (T) of the inclined insertion portion (2013) of the fixed portion (2001) and the inclined groove portion (2021) of the boarding / alighting portion (2002).
10. The pallet changing device for a machine tool according to claim 9, wherein (1, T3) and (T2, T4) are formed identical to each other. 16. The first and second guides (1001, 10)
02) formed on the upper surface (203) of the rail (2003)
The first and second inclined surfaces (2032, 2033) are provided on both sides of 1).
And the first and second inclined surfaces (203) are formed on both sides of the lower surface (2004) formed inside the moving brackets (51, 61) forming the first and second lift devices (5, 6).
2, 2033) and third and fourth inclined surfaces (2041,
2042) is formed, and a plurality of oil supply holes (2034) are vertically formed in the rail (2003),
Between the upper surface (2031) of the rail (2003) and the lower surface (2004) of the moving bracket (51, 61), there is a space (2005) in which the oil introduced from the oil supply hole (2034) remains. The pallet changing device for a machine tool according to claim 9, wherein the pallet changing device is formed. 17. The bearing (2006) for preventing uneven wear due to an unbalanced load generated on the rail (2003) is inserted into the lower inclined surface and one side surface of the moving bracket. Machine tool pallet changer.