TWM462162U - Index plate - Google Patents

Description

Indexing plate

The invention relates to an indexing plate, in particular to a rotary indexing plate for a machine tool.

A machine tool (such as a numerically controlled milling machine or machining center) is usually provided with a rotary table for fixing the workpiece to be machined, and the two ends of the rotary table are respectively mounted on the turntables of the two rotary indexing plates. The turntable is rotatable to adjust the angle of the workpiece on the table relative to the cutting tool to facilitate machining of various configurations on the workpiece. When the turntable is rotated to a predetermined angle, the turntable must stop rotating for the tool to machine the workpiece. In addition, during the processing, the turntable must be fixed by the brake device in the rotary indexing plate to avoid the micro-rotation of the turntable due to the cutting force, thereby causing the machining accuracy of the workpiece to deteriorate.

As shown in FIG. 1 , the rotary indexing plate 1 includes a base 11 , a rotating shaft 12 rotatable relative to the base 11 , a turntable 13 fixed to one end of the rotating shaft 12 , and a rotating shaft 12 disposed between the base 11 and the rotating shaft 12 for supporting the rotating shaft 12 . A bearing device 14 that rotates on the base 11 , a brake ring 15 that is fixed to the other end of the rotating shaft 12 and rotates along with the rotating shaft 12 , and a brake device 16 that is disposed between the base 11 and the brake ring 15 .

The brake device 16 includes a brake base plate 161 fixed to the base 11 , A hollow flow path 162 formed in the brake bottom plate 161, a brake piston 163 housed in the brake bottom plate 161, and a brake fixing piece 164 fixed to the brake pressure ring 15 are formed. With the above configuration, when the air pressure source or the fluid supplied from the oil pressure source enters the brake bottom plate 161 via the flow path 162, the brake piston 163 can push the brake to cause the piece 164 to cause the brake to press the piece 164 against the base 11, thereby The rotating shaft 12 and the turntable 13 are prevented from rotating.

The bearing device 14 includes a bearing housing 141 fixed to the base 11, a conventional bearing cover 142 fixed to the rotating shaft 12, a conventional bearing piece 143 disposed between the bearing housing 141 and the conventional bearing cover 142, and a conventional bearing. Three bearing pins 144 of three different surfaces of the sheet 143.

However, the above-mentioned conventional brake device 16 only has a single brake to make the piece 164. Therefore, the frictional force of the brake is generated only on the opposite sides of the piece of the brake 164, the braking effect is small, and the braking effect is poor, that is, the fixed rotating shaft 12 is fixed. The force of the turntable 13 is small, resulting in a slight rotation of the rotary shaft 12 and the turntable 13 due to the cutting force during machining, which reduces the precision of the machining. Moreover, in order to prevent the external cutting force from causing the brake to rupture the sheet 164, a single brake is required to make the thickness of the sheet 164 thick enough to have sufficient strength, but the thicker brake makes the sheet 164 too rigid to be used. The vibration caused by the dynamic cutting force on the turntable 13 and the rotating shaft 12 during the absorption process adversely affects the machining accuracy.

In addition, since the force of the oil pressure is greater than the force of the air pressure, the contact area of the pressure source of the brake piston 163 of the rotary indexing plate 1 connected to the oil pressure source is small, and the rotary indexing plate 1 connected to the air pressure source is relatively The brake piston 163 pressure source has a large contact area to enable the rotation of two different pressure sources. The rotary indexing plate 1 has the same braking force. This fact leads to the fact that the dimensions of the rotary indexing plate 1 must be designed differently according to the different pressure sources connected, so that in order to meet the needs of different users, the manufacturer must prepare a variety of parts, increasing the cost of assembly and future maintenance.

On the other hand, the conventional bearing device 14 includes a large number of parts, and there are many mating surfaces at the time of assembly, which tends to cause excessive accumulation tolerance, thereby affecting the division accuracy of the rotary indexing table 1 and the accuracy of the disk surface of the rotary table 13. Furthermore, since a plurality of parts are to be assembled in a limited space between the base 11 and the rotating shaft 13, the size of each part must be miniaturized, resulting in a low load capacity of the bearing unit 14.

Therefore, an object of the present invention is to provide an indexing disc with good braking effect.

It is still another object of the present invention to provide an indexing disk that has low vibration during processing.

A further object of the present invention is to provide an indexing disc having a high precision of the workpiece being machined.

Another object of the present invention is to provide an indexing disc that can be connected to any of a hydraulic source and a pneumatic source to reduce the variety of parts and facilitate assembly and maintenance.

Still another object of the present invention is to provide an indexing disk having high division accuracy and high precision of the working disk surface.

A further object of the present invention is to provide an indexing disk whose load energy High force.

Therefore, the indexing plate of the present invention comprises: a base; a main shaft rotatably disposed on the base; a bearing mechanism mounted between the base and the main shaft; a transmission mechanism for driving the main shaft; and a brake mechanism And comprising a plurality of brake pads, at least one of the plurality of brake pads being coupled to the spindle, wherein the movement of the spindle is prevented when the at least one brake pad generates a braking action.

Preferably, the brake mechanism includes a first inner brake pad coupled to the main shaft and an outer brake pad fixed to the base, the first inner brake pad and the outer brake pad at least partially overlapping.

Preferably, the brake mechanism additionally includes a second inner brake pad coupled to the main shaft, and the outer brake pad is located between the first inner brake pad and the second inner brake pad.

Preferably, the brake mechanism further includes a brake bottom cover fixed to the base and a piston slidably received in the brake bottom cover, the piston can abut the first inner brake pad to make the first inner brake The piece, the outer brake piece, and the second inner brake piece are in contact with each other, and the second inner brake piece is in contact with the base to exert an excellent braking effect and ensure machining precision.

Preferably, the piston is sized to enable the thrust of the piston to abut the first inner brake pad, the outer brake pad, and the second inner brake pad when the index plate is externally connected to the air pressure source. The base, and the strength of each of the members included in the brake mechanism and the fixed strength of the members fixed to the adjacent members are sufficient to withstand the pressure when the oil pressure source is externally connected to the index plate. Therefore, the indexing plate can be designed in one size for both hydraulic and pneumatic sources.

Preferably, the brake mechanism additionally includes a brake member fixed to the main shaft, and the first inner brake pad and the second inner brake pad are fixed to the brake member.

Preferably, the first inner brake pad, the second inner brake pad, and the outer brake pad are annular, and the first inner brake pad and the second inner brake pad are fixed to the brake component near a portion of the inner diameter thereof. The outer brake pad is fixed to the base near a portion of the outer diameter thereof, and the outer diameters of the first inner brake pad and the second inner brake pad are larger than the inner diameter of the outer brake pad.

Preferably, the brake mechanism additionally includes a gasket between the first inner brake pad and the second inner brake pad, and a passage formed in the brake member, one end of the passage is connected to the piston, the passage of the passage The other end can be connected to a pneumatic or hydraulic source.

Preferably, the first inner brake pad, the outer brake pad, and the second inner brake pad have flexibility to absorb vibration during processing, thereby further improving machining accuracy.

Preferably, the indexing plate further comprises a resetting mechanism, one end of the resetting mechanism contacts the base, and the other end of the resetting mechanism contacts the piston for releasing the braking state.

Preferably, the reset mechanism includes a cylindrical member and an elastic member housed in the cylindrical member.

Preferably, the bearing mechanism includes at least one rolling member for directly contacting the main shaft, so that a conventional bearing housing can be omitted to improve the assembly accuracy of the indexing disc.

Preferably, the bearing mechanism comprises a bearing cover fixed to the main shaft, a bearing piece fixed to the base, and a first roll between the bearing cover and the bearing piece a moving member, a second rolling member between the bearing piece and the main shaft, a third rolling member located between the bearing piece and the main shaft and having a longitudinal direction different from a longitudinal direction of the second rolling member, thereby forming a bearing having three sides restraining action member.

Preferably, the longitudinal direction of the third rolling member is perpendicular to the longitudinal direction of the second rolling member and parallel to the longitudinal direction of the first rolling member.

Preferably, the transmission mechanism includes a worm wheel fixed to the main shaft and a worm engaged with the worm wheel.

As described above, the advantages of the present invention over the prior art include: good braking effect, high precision of the machined workpiece, and the ability to connect any of the hydraulic source and the pneumatic source to reduce the variety of parts and load capacity.

Those skilled in the art will appreciate the additional benefits and other objectives of the novel as defined in the claims after reading the instructions.

1‧‧‧Rotary indexing plate

2‧‧‧Division

11‧‧‧Base

12‧‧‧ shaft

13‧‧‧ Turntable

14‧‧‧ bearing device

15‧‧‧Brake pressure ring

16‧‧‧ brakes

21‧‧‧Base

22‧‧‧ Spindle

23‧‧‧Working disk

24‧‧‧ brake mechanism

25‧‧‧Reset mechanism

26‧‧‧Transmission mechanism

27‧‧‧ bearing mechanism

141‧‧‧ bearing housing

142‧‧‧Chinese bearing cap

143‧‧‧Knowledge bearing pieces

144‧‧‧bearing needle

161‧‧‧ brake floor

162‧‧‧ flow path

163‧‧‧Brake piston

164‧‧‧Brakes to make tablets

240‧‧‧ brakes

241‧‧‧Brake bottom cover

242‧‧‧Piston

243‧‧‧ channel

244‧‧‧First inner brake pad

245‧‧‧shims

246‧‧‧Second inner brake pads

247‧‧‧Outer brake pads

248‧‧‧ gap

249‧‧‧ hole

251‧‧‧Cylinder members

252‧‧‧Flexible components

261‧‧‧ worm

262‧‧‧ worm gear

271‧‧‧ bearing cap

272‧‧‧ bearing pieces

273‧‧‧First rolling member

274‧‧‧Second rolling member

275‧‧‧ Third rolling element

276‧‧‧ keeper

The indexing disk of the present invention is described in detail by the preferred embodiment and the accompanying drawings, and the drawings are not necessarily drawn to true scale, and thus the present invention is not limited to the proportions in the drawings. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a rotary indexing disk showing a conventional brake device and bearing device; FIG. 2 is a perspective assembled view of the indexing plate of the present invention; FIG. 3 is a perspective sectional view of FIG. 2 is a plan sectional view of FIG. 2; FIG. 5 is an enlarged view of a portion of the brake mechanism of FIG. 4, showing an unbraked state; Figure 6 is an enlarged view of a portion of the brake mechanism of Figure 4 showing the braked state; and Figure 7 is an enlarged view of the portion of the bearing mechanism of Figure 4.

The foregoing and other technical features, features, and advantages of the invention will be apparent from

As shown in FIGS. 2, 3, and 4, the indexing plate 2 of the present invention includes a base 21, a main shaft 22 partially housed in the base 21, a work disk 23 fixed to one end of the main shaft 22, and a main shaft 22 mounted on the main shaft 22. The other end of the brake mechanism 24, the plurality of reset mechanisms 25 connected to the brake mechanism 24, the transmission mechanism 26 disposed between the main shaft 22 and the base 21, and assembled between the base 21 and the main shaft 22 for supporting the main shaft 22 A bearing mechanism 27 that rotates relative to the base 21.

As shown in FIGS. 3, 4 and 5, the brake mechanism 24 includes an annular brake member 240 fixed to the other end of the main shaft 22, an annular brake bottom cover 241 fixed to the base 21 adjacent to the brake member 240, and slidable. An annular piston 242 disposed in the recess of the brake bottom cover 241, a passage 243 formed in the brake bottom cover 241 and communicating with the recess of the brake bottom cover 241, sequentially fixed to the brake member 240 and facing the piston 242 The annular first inner brake piece 244, the annular spacer 245, and the annular second inner brake piece 246, and the annular outer brake piece 247 fixed to the base 21. The first inner brake piece 244, the second inner brake piece 246, and the outer brake piece 247 are collectively referred to as a brake pad, so the brake of the present invention The vehicle mechanism 24 has a plurality of brake pads. The first inner brake piece 244, the spacer 245, and the second inner brake piece 246 have substantially the same inner diameter, and the portion near the inner diameter is fixed to the brake member 240, but the first inner brake piece 244 and the second inner portion The outer diameter of the brake pad 246 is larger than the outer diameter of the spacer 245, so a gap 248 is formed between the first inner brake pad 244 and the second inner brake 246. Furthermore, the portion of the outer brake pad 247 near the outer diameter is fixed to the base 21, but the inner diameter of the outer brake pad 247 is smaller than the outer diameters of the first and second inner brake pads 244, 246, so that the outer brake pad 247 is close to the inner brake pad 247. A portion of the diameter is received within the gap 248 and overlaps portions of the first and second inner brake pads 244, 246 that are adjacent to their outer diameter. Further, the thickness of the spacer 245 is slightly larger than the thickness of the outer brake pad 247, so that when the piston 242 is not actuated, the portions where the outer brake pad 247 and the first and second inner brake pads 244, 246 overlap are not in contact with each other.

The outer diameter and the inner diameter of the piston 242 of the present invention are designed according to the condition that the indexing plate 2 is externally connected to the air pressure source, so that the thrust of the piston 242 can drive the first inner brake piece 244, the outer brake piece 247, and The second inner brake piece 246 abuts against the base 21 to generate sufficient friction when contacting the overlapping area to form a stable braking state; since the pressure of the air pressure source is less than the pressure of the oil pressure source, the piston 242 of the present invention The difference in size between the outer diameter and the inner diameter is larger than the difference in size designed by the external hydraulic source as a reference. As for the thickness of the piston 242, the dimensional strength of other members of the brake mechanism 24, the strength of the members to be fixed to each other, and the fixing strength of the members to the periphery, the indexing plate 2 having the above-mentioned piston diameter size is externally connected to The oil pressure source is designed as a reference; since the pressure of the oil pressure source is greater than the pressure of the air pressure source, the size of the brake mechanism 24 of the present invention is The outer diameter and the inner diameter of the piston 242 are different in size and the fixing strength is larger than that of the external air pressure source, so that it can withstand the large pressure of the oil pressure source. Therefore, the indexing plate 2 of the present invention has the advantage that the user can externally connect any of the air pressure source or the oil pressure source.

The reset mechanisms 25 are arranged in a ring shape in a spaced relationship from each other. Each of the reset mechanisms 25 includes a cylindrical member 251 whose one end is closed and whose other end forms an opening, and an elastic member 252 that is housed in the cylindrical member 251. The cylindrical member 251 is slidably received in the base 21, and the closed end of the cylindrical member 251 passes through the hole 249 of the outer brake pad 247. One end of the elastic member 252 abuts against the base 21, and the other end abuts against the inner wall surface of the closed end of the cylindrical member 251, so that the outer wall surface of the closed end of the cylindrical member 251 can always abut against the piston 242.

The transmission mechanism 26 includes a worm 261 that externally connects a power source (not shown) such as a motor, and a worm wheel 262 that is fixed to the main shaft 22. The worm 261 and the worm wheel 262 mesh with each other.

As shown in FIGS. 3, 4 and 7, the bearing mechanism 27 includes an annular bearing cap 271 fixed to the main shaft 22, an annular bearing piece 272 fixed to the base 21, and a portion between the bearing cap 271 and the bearing piece 272. A rolling member 273, a second rolling member 274 located between the bearing piece 272 and the main shaft 22 and having a longitudinal direction perpendicular to the longitudinal direction of the first rolling member 273, between the bearing piece 272 and the main shaft 22 and whose longitudinal direction is perpendicular to the second rolling A third rolling member 275 in the longitudinal direction of the member 274, and a retainer 276 that limits each of the rolling members 273, 274, 275.

In other embodiments, the inner brake pad may have only one or three or more pieces. When the inner brake pads are three or more, the number of outer brake pads 247 can be increased. The brake member 240 can be omitted and the inner brake pad can be directly fixed to the main shaft 22. The overlapping area of the brake pad and its corresponding member can be sandblasted to increase the coefficient of friction. The longitudinal directions of the first, second, and third rolling members 273, 274, 275 may be at an angle other than 90 degrees and 180 degrees from each other, that is, their longitudinal directions may be inclined to each other.

Instructions

As shown in FIGS. 4 and 5, when an external pneumatic source or oil pressure source (not shown) supplies fluid to the indexing disk 2, the elastic restoring force of the elastic member 252 causes the cylindrical member 251 to push the piston 242 to the brake bottom. One side of the communication passage 243 of the recess of the cover 241, and thus the piston 242, the first inner brake pad 244, the outer brake pad 247, the second inner brake pad 246, and the base 21 have no substantial contact with each other in the overlapping region. That is, the brake mechanism 24 does not exert a braking action in this state. Therefore, when an external power source (not shown) drives the worm 261 and thus the worm gear 262, the main shaft 22 fixed to the worm wheel 262 can rotate with the worm wheel 262. As shown in FIGS. 4 and 7, the bearing cap 271 is fixed to the main shaft 22, the bearing piece 272 is fixed to the base 21, and the first, second, and third rolling members 273, 274, and 275 respectively support and restrain the three faces of the bearing piece 272. The main shaft 22 can be rotated with high precision with respect to the base 21. In addition, since the second and third rolling members 274, 275 all directly contact the main shaft 22, instead of the bearing pin 144 contacting the bearing housing 141 (FIG. 1) as in the prior art, the bearing mechanism 27 of the indexing plate 2 of the present invention is not required. The conventional bearing housing 141, that is, the bearing mechanism 27 of the present invention has a small number of parts, so the group There are also fewer mating surfaces when assembled, so that the accuracy of the indexing disc 2 after assembly and the accuracy of the disk surface of the working disc 23 are high. On the other hand, since the present invention has no conventional bearing housing 141, the inside of the indexing disc 2 has a larger space for accommodating other members included in the bearing mechanism 27, so that the dimensions of the members can be larger than those of the prior art. So able to withstand even greater loads.

As shown in FIGS. 4, 5, and 7, when the main shaft 22 is rotated relative to the base 21 under the support of the bearing mechanism 27, the brake member 240 and the work disk 23 fixed to the main shaft 22 also rotate with the main shaft 22, of course. The first and second inner brake pads 244, 246 fixed to the brake member 240 are also rotated together with the brake member 240.

As shown in Figures 4 and 6, when the work disk 23 is rotated to a predetermined angle, the external power source no longer drives the worm 261, and the aforementioned rotatable member also stops moving, and the external air pressure source or oil pressure at this time. The source can supply fluid pressure to the indexing disk 2 via the passage 243. The fluid pressure indicated by the continuous arrow (Fig. 6) overcomes the elastic force of the elastic member 252 toward the piston 242, and moves the piston 242 to the side of the recess of the brake bottom cover 241 facing the first inner brake piece 244, and the piston 242 withstands the first inner brake pad 244. Since the brake pads are slightly flexible, the movement of the piston 242 causes the piston 242, the first inner brake pad 244, the outer brake pad 247, the second inner brake pad 246, and the base 21 to be in close contact with each other in the overlapping region, and The braking action is generated by the friction of the contact surface. At this time, the braking mechanism 24 of the present invention generates braking regions including four parts: (1) a region where the piston 242 and the first inner brake pad 244 face each other, and (2) a first inner brake pad 244 and an outer brake pad 247. Facing the area, (3) outer brake pads 247 and The area where the inner inner brake pad 246 faces, (4) the area where the second inner brake pad 246 and the base 21 face each other. Since the braking effect is more common than the conventional one, the braking effect is so excellent that the brake member 240, the main shaft 22, and the working disk 23 fixed by the first and second inner brake pads 244, 246 cannot have any slight movement. Therefore, the accuracy of the positioning process can be ensured. On the other hand, in order to make the surfaces of the four regions be in close contact, the brake pads can be slightly flexible, and the flexibility can absorb the vibration generated by the cutting force during processing, thereby further improving the positioning accuracy. .

When the machining is completed, the air pressure source or the oil pressure source stops supplying the fluid to the indexing plate 2, and the elastic member 252 of the reset mechanism 25 cooperates with the cylindrical member 251 to push the piston 242 toward the side of the pocket communication passage 243 of the brake bottom cover 241. The fluid is discharged from the recess of the brake bottom cover 241 along the passage 243 such that the piston 242, the first inner brake pad 244, the outer brake pad 247, the second inner brake pad 246, and the base 21 are not in contact with each other to release The braking action of the brake mechanism 24 returns to the unbraked state as shown in FIG.

However, the above is only the preferred embodiment of the present invention, and the scope of the present invention cannot be limited thereto, that is, the simple equivalent change and modification made by the novel patent application scope and the novel specification content, All should remain within the scope of this new patent.

21‧‧‧Base

22‧‧‧ Spindle

23‧‧‧Working disk

24‧‧‧ brake mechanism

25‧‧‧Reset mechanism

26‧‧‧Transmission mechanism

27‧‧‧ bearing mechanism

240‧‧‧ brakes

241‧‧‧Brake bottom cover

242‧‧‧Piston

243‧‧‧ channel

244‧‧‧First inner brake pad

261‧‧‧ worm

262‧‧‧ worm gear

271‧‧‧ bearing cap

272‧‧‧ bearing pieces

273‧‧‧First rolling member

274‧‧‧Second rolling member

275‧‧‧ Third rolling element

276‧‧‧ keeper

Claims (15)

An indexing disc comprising: a base; a main shaft rotatably disposed on the base; a bearing mechanism mounted between the base and the main shaft, the bearing mechanism including at least one rolling member for directly contacting the main shaft; a transmission mechanism for driving the spindle; and a brake mechanism mounted between the base and the spindle, the brake mechanism being operable to prevent movement of the spindle. The indexing plate of claim 1, wherein the bearing mechanism comprises a bearing cover fixed to the main shaft, a bearing piece fixed to the base, a first rolling member located between the bearing cover and the bearing piece, a second rolling member between the bearing piece and the main shaft, a third rolling member located between the bearing piece and the main shaft and having a longitudinal direction different from a longitudinal direction of the second rolling member. The indexing plate of claim 2, wherein the longitudinal direction of the third rolling member is perpendicular to a longitudinal direction of the second rolling member and parallel to a longitudinal direction of the first rolling member. The indexing plate of claim 1, 2, or 3, wherein the brake mechanism comprises a plurality of brake pads, at least one of the plurality of brake pads being coupled to the spindle, wherein the at least one brake pad When the brake is generated, the spindle is prevented from moving. The indexing plate of claim 4, wherein the brake mechanism comprises a first inner brake pad coupled to the main shaft and an outer brake pad fixed to the base, the first inner brake pad and the outer brake pad At least partially overlap. The indexing plate of claim 5, wherein the brake mechanism further comprises a second inner brake pad connected to the main shaft, and the outer brake pad is located at the first inner brake pad and the second inner brake pad between. The indexing plate of claim 6, wherein the brake mechanism further comprises a brake bottom cover fixed to the base and a piston slidably received in the brake bottom cover, the piston can be offset from the first An inner brake pad, the first inner brake pad, the outer brake pad, and the second inner brake pad are in contact with each other, and the second inner brake pad contacts the base. The indexing plate of claim 6 wherein the size of the piston is sufficient to enable the first inner brake pad, the outer brake pad, and the thrust of the piston when the indexing plate is externally connected to the air pressure source. And the second inner brake pad abuts against the base, and the strength of each component included in the brake mechanism and the fixing strength of the components fixed to the adjacent component are sufficient to withstand the external hydraulic pressure source of the indexing plate pressure. The indexing plate of claim 7, wherein the first inner brake pad, the outer brake pad, and the second inner brake pad are flexible to absorb vibration during processing. The indexing plate of claim 7, wherein the brake mechanism additionally includes a brake member fixed to the main shaft, and the first inner brake pad and the second inner brake pad are fixed to the brake member. The indexing plate of claim 10, wherein the first inner brake pad, the second inner brake pad, and the outer brake pad are annular, and the first inner brake pad and the second inner brake pad are adjacent to each other. a portion of the inner diameter thereof is fixed to the brake member, and the outer brake pad is fixed to the base at a portion close to an outer diameter thereof, The outer diameters of the first inner brake pad and the second inner brake pad are larger than the inner diameter of the outer brake pad. The indexing plate of claim 11, wherein the brake mechanism further comprises a gasket between the first inner brake pad and the second inner brake pad, and a passage formed in the brake member, One end of the passage is connected to the piston, and the other end of the passage can be externally connected to a pneumatic source or a hydraulic source. The indexing plate of claim 11, further comprising a reset mechanism, one end of the reset mechanism contacting the base, and the other end of the reset mechanism contacting the piston. The indexing plate of claim 13, wherein the resetting mechanism comprises a cylindrical member and an elastic member housed in the cylindrical member. An indexing plate according to claim 4, wherein the transmission mechanism comprises a worm wheel fixed to the main shaft and a worm meshing the worm wheel.