KR100655318B1 - Pallet clamping system for machining center of prevention oil - Google Patents

Abstract

A pallet clamp apparatus for oil leakage prevention of a machining center is provided to preclude the abrasion of an O ring and reduce the working hour due to the replacement of the O ring by mounting the first O ring at the shaft cap. A pallet clamp apparatus for oil leakage prevention of a machining center comprises a full stud(211) mounted at the lower surface of a pallet(120) for fixing/supporting the workpiece; a pallet base(1) separated from the lower surface of the pallet, wherein a pallet cylinder is placed; a cap(9) contacted with the full stud in the pallet cylinder; a collet(6) installed at the perimeter of the cap whose one side is formed with an air circulating path and other side is connected with an air inlet hole(13) of the lower side of the pallet base; a third O ring(4c) contacted with the outer peripheral surface of one side of the collet; a shaft cap(2) installed with a cylinder structure; and first and second O rings(4a,4b) mounted at the outer peripheral surface of the upper part and the lower surface of the shaft cap.

Description

Pallet Clamping System for Machining Centers

1 is a front view showing an automatic pallet changer of a horizontal machining center;

Figure 2 is a cross-sectional view showing the structure of a conventional pallet clamp device according to Figure 1,

3 is a cross-sectional view of a conventional pallet clamp device,

4 is a cross-sectional view of main parts of the present invention.

<Description of Symbols for Major Parts of Drawings>

1: pallet base 2: shaft cap

3: air passage 4a: O-ring 1

4b: O-ring 2 4c: O-ring 3

5: spring coil 6: collet

8: quad ring 9: cap

10: cone 11: hydraulic line 1

12: Hydraulic line 2 13: Air inlet hole

15: Pallet Cylinder

100: automatic pallet changer 110: rotary shaft

120: pallet 130: hanger

140: bed 200: pallet clamp device

210: locate cap 211: full stud

211a: Torso 211b: Head

212: slope 220: table

221: pin groove 222, 223: groove

230: locate pin 231: tapered surface

233: collet 233a: ridge

240: cylinder member 241: spring member

242: piston member 243: the horizontal axis

244: retaining ring

The present invention relates to a pallet clamp device of the machining center, and more particularly to a pallet clamp device for preventing leakage of the machining center for leakage of hydraulic oil during the clamp / unclamp of the pallet.

In general, the machining center is provided with one or more pallets (Pallets), preferably two pallets are rotatably coupled to the Automatic Pallet Changer (APC).

Here, when the pallet is rotated and moved to the exchange position, the pellet is down and up into the pellet base by hydraulic pressure, thereby clamping and unclamping the pallet base.

1 is a front view schematically showing the configuration of the automatic pallet changer 100 of a horizontal machining center. As shown, the automatic pallet changer 100 replaces a finished workpiece to process a new workpiece. A rotation shaft 110 which is capable of reciprocating and rotating up and down to be positioned, a hanger 130 extending in both directions of the rotation shaft 110, and the hanger 130 It is composed of a pallet (120) fixed to each side of) to mount the workpiece for processing.

The rotary shaft 110 is composed of a reciprocating cylinder structure capable of vertical reciprocation and rotational movement, the pallet 120 is connected to each side of the hanger 130 extending in both directions thereof any one of these pallets 120 While the workpiece is being processed, the operator can prepare the workpiece to be processed next on the pallet 120 on the other side.

When the automatic pallet changer 100 finishes the workpiece processing on the pallet 120 on one side, the rotary shaft 110 can be rotated to automatically exchange the position of the pallet 120 to process the next workpiece. .

Meanwhile, in the machining center, after the position of the pallet 120 is exchanged by the automatic pallet changer 100, the pallet clamp device 200 is provided to fix the pallet 120 in order to prevent flow during work of the workpiece. There will be, look at the structure of the pallet clamp device 200 as follows.

2 is a cross-sectional view showing a structure of a conventional pallet clamp device 200 according to Figure 1, Figure 3 is a cross-sectional view of the conventional pallet clamp device 200.

As shown, the conventional pallet clamp device 200 is formed with four locator caps 210 projecting downward on the bottom of each pallet 120, the bed is spaced apart from the rotary shaft 110 by a predetermined interval ( The upper surface of the 140 is provided with a table, and a plurality of locate pins 230 detachably coupled to the respective locate caps 210 are formed on the upper surface of the table 220.

The locator cap 210 is a hollow cylindrical structure that is vertically open, is fastened to the bottom surface of the pallet 120, is fixed and provided, the inner side of the pull stud (pull stud) is fitted to the locator pin 230 211 is provided, the pull stud 211 is screwed to the bottom of the pallet 120, is fixed, the pull stud 211 is a bar-shaped body and the inside of the locator pin 230 It is composed of a head (211b) extending in the radial direction from one end of the body 211a to be locked. In addition, the inner circumferential surface of the locate cap 210 is formed of an inclined surface obliquely downward to the outside to form a lower diameter thereof is wider than the upper.

The locator pin 230 is a hollow cylindrical structure that is opened up and down, the inlet side of the upper portion is formed narrow, is fastened to the upper surface of the table 220, is fixed. In addition, the locate pin 230 has an inclined tapered surface 231 formed on the outer circumferential surface thereof to be in close contact with the inclined surface of the locate cap 210, and the pull stud 211 on the inner circumferential surface thereof. A collet 233 having a convex ridge 233a at the top thereof is provided such that the head 211b of the swivel can be engaged, and the collet 233 is formed in a recess formed on an inner circumferential surface of the locate pin 230. The raised portion 233a is inclined downward by a predetermined angle in the inserted state, and the lower end thereof is fixed in a locked state to one side of the cylinder member 240 provided below the locate pin 230.

On the other hand, the table 220, the pin groove 221 is formed below the locate pin 230, a plurality of grooves 222 formed by stepping on the inner bottom surface of the pin groove 211 is doubled Formed. In addition, a plurality of fluid passages through which the hydraulic fluid F flows are formed on the inner wall surface of the fin groove 211 at a predetermined interval from each other.

The cylinder member 240 is inserted into the pin groove 221, and is provided in a fixed state has a cross (+) shape, the lower end of its longitudinal axis is spaced apart from the bottom surface of the groove 222 by a predetermined interval, An upper portion protrudes above the upper surface of the table 220 and is embedded in the locate pin 230. A through hole is formed in the longitudinal axis of the table 220 in the longitudinal direction thereof by a spring member 241 in the through hole. The piston member 242 that is elastically supported is inserted into the piston member 242, and the upper end of the piston member 242 is drawn out of the through hole in a normal state and positioned at an upper inlet side of the locate pin 230. . In addition, a fixing ring 244 is provided on the upper surface of the horizontal axis of the cylinder member 240 so that the fixing ring 244 prevents the cylinder member 240 from being separated from the inside of the pin groove 221. It is fixed to the inner wall surface of).

Looking at the operation relationship of the conventional pallet clamp device having such a structure as follows.

First, when the rotary shaft 110 rotates to reach the machining position of the pallet 120 on which the workpiece (not shown) is mounted, the rotary shaft (not shown) descends and the pallet 120 is moved to the table 220. It is fixed to the upper surface, wherein the locate cap 210 is lowered at the same time as the rotary shaft (not shown) is coupled to cover the upper portion of the outer circumferential surface of the locate pin 230 as shown in Figure 3, the locate The inclined surface of the cap 210 is in close contact with the tapered surface 231 of the locate pin 230.

In addition, when the pallet 120 descends, the pull stud 211 is inserted into the locate pin 230 to press the piston member 242 downward, and the pressurized piston member 242 again. The spring member 241 is compressed and lowered. At this time, the fluid passage, which is shielded by the horizontal axis of the cylinder member 240, is opened, through which the hydraulic fluid (between the horizontal axis 243 and the fixing ring 244) is opened. F) is press fitted. The press-fitted fluid F lowers the cylinder member 240 to the bottom side of the groove 222 as shown in FIG. 3, and the collet 233 is located by the lowering of the cylinder member 240. It descends along the inner circumferential surface of the 230 and the upper portion is retracted inward, so that the ridge 233a of the collet 233 is to hold the head 211b of the pull stud 211 in a locked state. In the end, since the pallet 120 is clamped to the surface of the table 220, it is possible to perform a machining operation on the workpiece therefrom.

When the workpiece machining is completed, the machining of another workpiece (not shown) mounted on the pallet 120 on the other side is performed. In this case, as shown in FIG. 221, the fluid (F) is pressurized inside the cylinder member 240 is raised by the hydraulic pressure, and the collet 233 to be raised together with the cylinder member 240 is a ridge 233a formed on the upper end thereof ) Is inserted into the recessed portion inside the locate pin 230, the upper portion of the locating pin 230 is opened again to release the locking state of the pull stud 211. At the same time, as the rotary shaft (not shown) rises, the pull stud 211 is separated from the inside of the collet 233 and rises along the rotary shaft 110, thereby causing the locate cap 210 and the furnace. Kate pin 230, ie pallet 120 and table 220, are completely released from the clamp and separated from each other. On the other hand, the piston member 242 is raised again by the elastic force of the spring member 241 is to return to the inlet side of the locator pin 230, the upper end of which is the original position.

Conventional pallet base clamps having the above-described coupling relationship cause wear of the O-rings in the collet in a short time if the degree of machining surface of the pallet base is not even, and leakage on the table is frequently generated.

In addition, leaked hydraulic oil has been ejected through the air flow path, causing equipment trouble.

Accordingly, the present invention has been made to solve the problems of the prior art as described above, the object of the present invention is the oil leakage of the machining center to prevent the wear of the O-ring provided in the pallet clamp collet of the machining center and the leakage of pressure oil The present invention provides a preventive pallet clamp device.

The present invention for achieving the above object is provided with a full stud on the bottom surface of the workpiece fixed support pallet of the machining center, the pallet base is spaced apart from the bottom of the pallet is composed of a pallet cylinder, the pallet cylinder In the cap is provided with a collet and a collet in contact with the pull stud, one side of the cap is formed with an air flow path, the other side is a leakage preventing clamp device connected to the air inlet hole in the lower side of the pallet base, The O-ring 3 and the O-ring 2 and O-ring 1 are respectively provided on the shaft cap and the upper outer peripheral surface and the lower surface of the shaft cap provided in a hollow cylindrical structure in contact with the lower inner peripheral surface.

Here, it is preferable that the shaft cap is made of SM45C steel and provided with an outer diameter polished.

On the other hand, there may be a plurality of embodiments of the present invention, hereinafter will be described in detail with respect to the most preferred embodiment.

Through this preferred embodiment the objects, other objects, features and advantages of the present invention will become more apparent from the following description with an embodiment according to the present invention in connection with the accompanying drawings shown for the purpose of illustration.

In addition, in each figure used for description, the same component may be attached | subjected, and may show the same number, and the overlapping description may be abbreviate | omitted.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the pallet clamp device for preventing leakage of the machining center according to the present invention.

Figure 4 is a cross-sectional view showing only the main part of the present invention that is configured inside the pallet base of the machining center.

Looking at the present invention based on Figures 2 to 4, the lower part of the workpiece fixing support pallet 120 of the machining center is composed of a pull stud 211 is provided with a head (211b) and the body (211a), pallet ( 120) The pallet base 1 which is spaced apart from the bottom is composed of a pallet cylinder 15 therein.

Here, the inside of the pallet cylinder (15) is provided with a cap (9) contacting the head portion of the pull stud 211 provided in the lower portion of the pallet and the collet (6) around the cap (9).

In addition, one side of the cap (9) is formed with an air flow path (3), the air flow path (3) is connected to the air inlet hole (13) below the pallet base (1), the air inlet hole (13) The upper part is provided with the shaft cap 2 of a hollow cylindrical structure.

Here, the upper outer peripheral surface and the lower surface of the shaft cap 2 are provided with O-rings 2 (4b) and O-rings 1 (4a), respectively.

In addition, the shaft cap (2) is made of SM45C steel and the outer diameter is polished and installed.

Looking at the operation principle of the present invention configured as described above are as follows.

When the pallet 120 is positioned on the table 220, air is injected through the air flow path 3 through the air inlet hole 13.

Air injected in this way serves to remove various foreign matter on the pull stud 211 of the pallet (120). When the pull stud 211 of the pallet 120 is pressed downward and meets the cap 9, the cap 9 is lowered downward by the length of the body 211a of the pull stud 211 and the hydraulic line 1 ( 11) the pressurized oil flows in. At this time, the collet 6 of the pallet cylinder 15 moves downward, and the ridge 233a, which is the upper part of the collet 6, is located at the upper end of the head 211a of the pull stud 211 located on the bottom surface of the pallet 120. It is clamped by pulling downward, and O-ring 3 (4c) interposed between the cone 10 and the pallet cylinder 15 prevents leakage of the pressurized oil to flow upward.

In addition, when the collet 6 is operated up and down, the inner diameter of the lower part of the collet 6 and the guide are provided with the shaft cap 2 worked with the outer diameter polishing (SM45C), which is caused by poor surface roughness of the pallet base 1. The oil leakage was prevented and O-ring 1 (4a) was installed on the lower surface of the shaft cap (2) to prevent wear of the O-ring 1 (4a).

In addition, O-ring 2 (4b) is provided on the upper outer peripheral surface of the shaft cap (2) to protect the inside of the collet (6) by preventing the inside of the collet (6) from the outflow of the pressure oil.

Therefore, when the workpiece is finished by clamping in the above pattern, the hydraulic oil flows in the hydraulic line 2 (12), the collet 6 moves upward, and the pallet 120 is unclamped. When the pallet 120 is lifted up, the cap 9 is moved upward by the spring coil 5 to its original position.

In the present invention, since each O-ring (4a, 4b, 4c) is provided in the optimum position, the wear of the O-ring occurs frequently during the vertical action of the collet 6 by the shaft cap (2) guides the lower portion of the collet 6 The oil pressure flows out of the lower portion of the pallet base (1), which causes the oil and air to be mixed with each other and leaks to the outside, thereby reducing the damage of various mechanical parts as much as possible.

Although specific embodiments of the present invention have been described and illustrated above, it is obvious that the present invention may be variously modified and practiced by those skilled in the art, and such modified embodiments may be individually disclosed from the technical spirit or the prospect of the present invention. It should not be understood that the modified embodiments as such should fall within the appended claims of the present invention.

According to the above, the present invention eliminates external factors that may cause wear of the O-ring by providing the O-ring 1 below the shaft cap to block leakage of the pressurized oil.

Therefore, frequent wear occurs to reduce the loss of working time due to the replacement of the O-ring and O-ring, and prevents leakage of equipment because it stably prevents leakage of pressure oil.

In addition, this effect can be resolved by the customer complaints to increase the customer's confidence in the product.

Claims (2)

The full stud 211 is provided on the bottom of the workpiece 120 for fixing the workpiece of the machining center, and the pallet base 1 positioned apart from the bottom of the pallet 120 is configured with a pallet cylinder 15 therein. The inside of the pallet cylinder (15) is provided with a collet (6) around the cap (9) and the cap 9 in contact with the pull stud and the air passage (3) is formed on one side of the cap (9) The other side is a leakage preventing clamp device connected to the air inlet hole (13) below the pallet base (1), the hollow 3 in contact with the outer peripheral surface of the duck 3 (4c) and the lower inner peripheral surface of the collet (6) O-ring 2 (4b), O-ring 1 (4a) is provided on the shaft cap (2) and the upper outer peripheral surface and the lower surface of the shaft cap (2) provided in a cylindrical structure, respectively, Device. The method of claim 1, The shaft cap (2) is made of SM45C steel and the pallet clamp device for oil-weather pants of the machining center, characterized in that the outer diameter was made.

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