JPH0318104Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention is a workpiece tilting support device for a processing machine used when drilling an inclined hole in a workpiece, etc.
In particular, the present invention relates to a support structure for a support shaft that supports a tilting table included in the device.

(Prior art) The valve insertion hole in the cylinder head of an engine, that is, the hole into which the valve system or valve guide of the intake and exhaust valves is inserted, is formed in an inclined shape with respect to the reference surface (bottom surface) of the cylinder head. However, when drilling such an inclined hole in a workpiece, a workpiece tilting support device (tilting device) as disclosed in, for example, Japanese Unexamined Patent Publication No. 59-156632 is used. In this workpiece tilting support device, a tilting table for fixing a workpiece can be tilted with respect to the base via a support shaft supported by the base, and when drilling a workpiece, the workpiece is moved to the tilting table. The tilting table is fixed to the workpiece tilting support device, and then the tilting table is tilted and held in the tilted state. In this state, a processing machine (such as a drill) placed corresponding to the workpiece tilting support device is moved horizontally or vertically to drill the hole. When the hole is drilled, an inclined hole is formed in the workpiece.

By the way, the tilting table of the workpiece tilting support device is tilted only when drilling is performed by the processing machine, and when the machined workpiece is taken out or the next workpiece is transferred to the tilting table. It is necessary to return the tilting table to its original, non-tilted state. Therefore, when conveying and processing workpieces continuously or in an assembly line, such as when drilling workpieces (cylinder heads, etc.) in an automobile production factory, etc., the tilting table of the tilting support device is tilted. The operation and return operation are frequently repeated, which causes the following problems.

That is, the weight of the tilting table and the work fixed thereto is very large, and therefore a large load is always applied to the support shaft that supports the tilting table.
If the tilting table repeatedly tilts and returns under such conditions, the bearing of the support shaft or the journal portion of the support shaft may wear unevenly, which may cause the axial center of the support shaft to shift downward. Become. In this way, when the axial center of the support shaft shifts, the tilting table and the workpiece fixed to the tilting table also shift from the reference position (the position to be set during machining).
Therefore, an error occurs in the processing position of the workpiece by the processing machine, and processing accuracy deteriorates.

(Purpose of the invention) The present invention is intended to address the above-mentioned problems regarding a tilting support device used when drilling an inclined hole in a workpiece. Even if uneven wear occurs on the bearing or journal of the support shaft that supports the tilting table due to repeated operations, and the axis of the support shaft deviates from its normal position, the processing machine When machining a workpiece by
To realize a support structure for a support shaft that can center the support shaft with high precision by correcting the deviation of the axis. As a result, when processing a workpiece using this type of tilting support device, it is possible to prevent a decrease in machining accuracy caused by misalignment of the axis of the support shaft and a concomitant decrease in product quality. purpose.

(Structure of the invention) In order to achieve the above object, the present invention is characterized by the following structure.

That is, the workpiece tilting support device is provided with a clamp unit for clamping the workpiece, has a tilting table tiltably held on a base via a horizontal support shaft, and is arranged correspondingly to a processing machine that processes the workpiece. A cylinder chamber is formed in the support hole corresponding to the support shaft, a piston is slidably fitted to the support shaft, the piston is housed in the cylinder chamber, and hydraulic oil is supplied to the cylinder chamber. A hydraulic circuit is provided for supplying and discharging the piston to move the piston, a tapered portion is formed at one end of the piston, and a tapered portion corresponding to the tapered portion is formed on the support shaft. The hydraulic circuit moves the piston so that the taper part of the piston separates from the taper part of the support shaft when the tilting table performs a tilting operation and a return operation, and also moves the piston so that the taper part of the piston moves away from the taper part of the support shaft, and when the workpiece is processed by the processing machine, that is, the tilting When the table is held in an inclined state, the piston is moved so that the taper portion of the piston presses the taper portion of the support shaft.

Therefore, during the tilting and returning operations of the tilting table, the support shaft rotates while being supported by a separately provided bearing without contacting the taper portion of the piston, and when machining a workpiece, the support shaft rotates while being supported by a separately provided bearing. It will be supported through the section. In this case, since the piston is held in the cylinder chamber so that its axial center coincides with the normal axial center of the support shaft, even if the bearing or the journal portion of the support shaft is unevenly worn, When machining a workpiece, the axial center of the support shaft is always positioned on the regular axial center, and the deviation of the axial center of the support shaft due to the uneven wear, that is, the positional deviation of the tilting table, is corrected.

(Effects of the invention) As described above, according to the workpiece tilting support device for a processing machine according to the present invention, the tilting operation and returning operation of the tilting table are repeated, and the bearing or journal of the support shaft supporting the tilting table is Even if uneven wear occurs on the part, the tapered part of the piston is pressed against the tapered part of the support shaft during machining of the workpiece, so that the support shaft can be centered with high precision through the piston. Become. This corrects the positional shift of the tilting table on which the workpiece is fixed, and reduces the deterioration of machining accuracy caused by the uneven wear when drilling etc. is performed on the workpiece using this type of equipment. This will prevent harmful effects such as quality deterioration.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

As shown in FIGS. 1 and 2, the workpiece tilting support device 1 includes a pair of bearing stands 3 ₁ , 3 ₂ erected on both sides of a base 2 as main components, and both bearing stands 3 ₁ , 3 . ₂ , the tilting table 4 is tiltably supported between bearing portions 3a and 3b provided at the respective bearings 3a and 3b.

The tilting table 4 has a bracket 4' provided at its lower end connected to a piston rod 5a of a tilting cylinder 5 attached to the base 2, so that the piston rod 5a can be moved from the state shown in FIG. When it moves backward, it is tilted from the vertical position to the tilted position shown in FIG. It is starting to return to its original position.
Here, as shown in FIG. 2, the above bearing stands 3 ₁ , 3 ₂
When the tilting table 4 is in the vertical or inclined position, the rods 6a and 6b are protruded and engaged with the engagement holes 4a and 4b provided in the tilting table 4. Fixing cylinders 6 ₁ and 6 ₂ are provided to fix these positions, respectively.

The tilting table 4 is equipped with a workpiece conveying table provided with a pair of rail members 7a, 7a extending longitudinally below the space A for transporting a workpiece (for example, a cylinder head) by hand-pushing or the like. 7
In order to convey the work in a straight line in the longitudinal direction,
A workpiece receiving member 4c fixed to the front surface of the tilting table 4
a side rail 8 arranged at a predetermined interval (approximately the same width as the workpiece), a positioning mechanism 9 for positioning the transported workpiece at a predetermined position, and a workpiece positioned by the mechanism 9. A clamp unit 10 for clamping the
Further, as shown in FIG. 3, a processing tool insertion hole X is formed for introducing a processing tool M such as a drill in a processing machine arranged correspondingly behind the tilting table 4 into the workpiece W side. As shown in FIG. 2, the workpiece conveyance table 7 is fixed to the upper end of a piston rod 11a of a conveyance table driving cylinder 11 which is vertically fixed at the lower central part of the tilting table 4, and the workpiece conveyance table 7 is A pair of guide rods (not shown) hanging down from the table 7 are fitted in a pair of cylindrical members 12, 12 fixed on both sides of the cylinder 11 on the tilting table 4 so as to be able to move up and down. By moving the piston rod 11a of the cylinder 11 up and down depending on the size, etc., the carrier 7 can be moved to a desired height while maintaining a horizontal state by a pair of guide rods. Further, the side rail 8 has an upper portion attached to the first holding member 13,
Its lower part is attached to a second holding member 14, and these holding members 13 and 14 are connected via upper and lower first and second links 15 and 16 to form a parallel link mechanism. A side rail setup change cylinder 17 for driving the mechanism is provided at the top of the tilting table 4, and the side rail 8 is moved by the action of the cylinder 17 via a piston rod 17a. Furthermore,
The positioning mechanism 9 includes a positioning cylinder 18 fixed to both sides of the upper end of the tilting table 4, and an L-shaped arm connected to a piston rod 18a in the cylinder 18 and swingable around a support shaft 19. 20 and a positioning rod 21 engaged with the arm 20, and the positioning rod 21 is projected toward the workpiece side, that is, toward the space A side by the downward movement of the piston rod 18a. The clamp unit 10 also includes a unit driving cylinder 22 fixed to the center of the upper end of the tilting table 4, and a pair of guide members 23, 23 fixed to both sides of the cylinder 22 on the tilting table 4.
A pair of driving rods 25, 25 are fitted into the guide members 23, 23 so as to be movable back and forth and are connected to the piston rod 22a of the unit driving cylinder 22 via a connecting member 24, and the upper ends thereof A support rod 4 is engaged with the front ends of the rods 25, 25 and has a lower end protruding from the front surface of the tilting table 4.
A pair of clamping members 2 connected to d and 4d and for clamping the workpiece at the center.
main arms 28, 28 to which 6, 26 are attached via holding members 27, 27, respectively, and an auxiliary arm whose one end is connected to the holding members 27, 27 and the other end is connected to the support rods 4d, 4d. 29,2
9. Here, each pair of main arms 28, 28, auxiliary arm 29, and holding member 27 constitute a parallel link mechanism, and the drive rods 25, 25 are moved rearward by the operation of the unit drive cylinder 22. When the clamp members 26, 2
6 moves in parallel in a direction approaching the front surface of the tilting table 4 to clamp the workpiece. In that case, each of the clamp members 26 is connected to the first support shaft 30 and the second support shaft 31 of the holding member 27.
Since it is possible to swing in two directions through the
Designed to securely clamp the workpiece. Incidentally, the tilting table 4 is provided with a return prevention pawl 32 that prevents the work from returning when the work is transported to a predetermined position.

Next, the supporting structure of the tilting table 4, which is a feature of the present invention, will be explained with reference to FIG.

Both bearing portions 3a and 3b in a pair of left and right bearing stands 3 ₁ and 3 ₂ erected on both sides of the base 2
In the above, a pair of support shafts 34, fixed to both sides of the tilting table 4 in the bearing cases 33 ₁ and 33 ₂ , respectively, are provided.
35 is being rushed. In addition, both cases 33 ₁ , 3
Bearing covers 37 ₁ and 37 ₂ are fixed to the ends of bearing 3 ₂ by bolts 36 and 36, respectively. Of the two support shafts 34 and 35, the right support shaft (hereinafter referred to as the first support shaft) 34 has a large-diameter base 34a and a small-diameter support portion 34b integral with the base 34a. The base portion 34a is connected to the bolt 3.
8 to the right side surface of the tilting table 4, and the support portion 34b is rotatably held in the bearing case ₃₃₁ via two tapered roller bearings 39, 40. Note that the bearing case 33 ₁ has a seal member 41 that comes into sliding contact with the support shaft 34 .
is installed.

On the other hand, the left support shaft (hereinafter referred to as a second support shaft) 35 has a large diameter base 35a and a small diameter support part 35b, and the base 35a is attached to the left side of the tilting table 4 by a bolt 42. A seal member 43 is interposed in the bearing case 33 ₂ and slidably contacts the support shaft 35 .

A cylinder chamber 44 is formed within the bearing case ₃₃₂ , and a cylindrical piston 46 having a bush 45 fixed to its inner peripheral surface is fitted into the cylinder chamber 44 so as to be movable forward and backward in the axial direction. At the same time, the support portion 35b of the second support shaft 35 is rotatably fitted into the bush 45 of the piston 46. A tapered portion 46a (the inner circumferential surface is conical) is formed on the inner circumferential surface of the end of the piston 46 on the side of the tilting table 4, and the second support shaft 3
5, a tapered portion 35c corresponding to the tapered portion 46a is provided at a position facing the tapered portion 46a.
is formed. Further, the cylinder chamber 44 is defined by the piston 46 into a first hydraulic chamber 47 and a second hydraulic chamber 48 .
The piston 46 is moved forward and backward by appropriately supplying and discharging hydraulic oil to the pistons 7 and 48.
The tapered portion 46a of the second support shaft 35 and the tapered portion 3 of the second support shaft 35
5c are pressed against each other and separated from each other.
Note that the taper portion 46a of the piston 46 has the taper portion 46a and the taper portion 35 of the second support shaft 35.
Multiple slits 4 to improve adhesion with c.
6b...46b are formed.

Next, the operation of the above embodiment will be explained.

First, the general operation of the workpiece tilting support device 1 during processing will be explained. As shown in FIG. At the same time, the clamp unit 10 is operated to fix the workpiece to the tilting table 4, and then the tilting cylinder 5 is operated and the tilting table 4 is moved to the workpiece W.
At the same time, it is tilted into the inclined position shown in FIG. In this state, the processing tool M of the processing machine is advanced from behind the tilting table 4 through the processing tool insertion hole X formed in the tilting table 4, so that the workpiece W clamped on the tilting table 4 is A slanted hole will be drilled.

In this way, when the drilling of the workpiece W is completed, the processing tool M is retreated, and the tilting cylinder 5 is operated again to return the tilting table 4 to the vertical position shown in FIG. Thereafter, the clamp unit 10 releases the clamp on the workpiece W that has been processed. Then, as the next workpiece is brought in, the workpiece W that has been machined is taken out, and the drilling work for the workpieces is sequentially performed in the same manner.

However, in the middle of such processing work,
The following operation is performed in the left bearing part 3b of the pair of bearing parts 3a and 3b shown in FIG. That is, when the tilting table 4 is in the vertical position or tilted between the vertical position and the tilted position, a hydraulic circuit (not shown) is installed in the second hydraulic chamber 48 formed in the cylinder chamber 44 of the bearing portion 3b. As hydraulic oil is supplied from the cylinder chamber 44, the piston 46 fitted in the cylinder chamber 44 is in a retracted state as shown in the figure. Therefore, in this case,
Tapered portion 46a of the piston 46 and tapered portion 35c of the second support shaft 35 fixed to the tilting table 4
The second support shaft 35 is connected to a bush 45 fixed to the inner peripheral surface of the piston 46.
It will rotate while being supported by.

On the other hand, when the tilting table 4 is tilted and fixed in the tilted position, the hydraulic oil is discharged from the second hydraulic chamber 48 of the cylinder chamber 44 and the first hydraulic chamber 47 is discharged before starting machining of the workpiece. By supplying hydraulic oil to the piston 46, the piston 46 is moved forward, and the taper portion 46a of the piston 46 comes into contact with the taper portion 35c of the second support shaft 35 and presses the taper portion 35c. Therefore, when processing a workpiece, the second support shaft 35 is supported by the tapered portion 46a of the piston 46.
In that case, since the axial center of the piston 46 is provided to coincide with the regular axial center of the second support shaft 35 (and the first support shaft 34), the support portion 35b of the second support shaft 35 Or, even if the bush 45 to which the support portion 35b is fitted is unevenly worn, the second support shaft 35 is raised above the normal axis by the taper portion 46a of the piston 46 during workpiece machining as described above. It will be accurately centered. As a result, as the support portion 35b or the bush 45 of the second support shaft 35 is unevenly worn, the second support shaft 35
Even if the axis of the tilt table 4 is shifted and the position of the tilting table 4 is shifted accordingly, this shift will be corrected when machining the workpiece, and therefore the workpiece will be machined in the predetermined position with high precision. It will be administered.

In this embodiment, the first support shaft 34 is supported by tapered roller bearings 39, 40 in the right bearing portion 3a, and these tapered roller bearings 39, 40 have a self-aligning function. At the same time, since the thrust force acting in the axial direction can be received, when the tapered portion 46a of the piston 46 presses the tapered portion 35c of the second support shaft 35, the pressing force causes the tapered roller bearing 39, 40 is automatically aligned, the first support shaft 34 is also centered, and the tapered roller bearings 39 and 40 receive the above-mentioned pressing force (thrust force), so that the axial position of the tilting table 4 is adjusted. It will be regulated.

In this embodiment, the support shaft 35 is fixed to the tilting table 4, and the piston 46 is provided on the base (bearing stand) side. It is also possible to configure it so that it is provided on the stand side.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view of the workpiece tilting support device, Fig. 2 is a front view of the device, and Fig. 3 is a view of the device when the tilting table of the device is tilted. FIG. 2 is a cross-sectional view taken along the line 2, and FIG. 4 is an enlarged cross-sectional view of essential parts showing the support structure of the tilting table. DESCRIPTION OF SYMBOLS 1... Workpiece tilting support device, 3 ₂ ... Base (bearing stand), 4... Tilting table, 10... Clamp unit, 35... Support shaft (second support shaft), 35c...
Tapered portion of support shaft, 44... Cylinder chamber, 46...
...Piston, 46a...Piston taper part, W
……work.

Claims (1)

[Scope of utility model registration request] A workpiece tilting support device for a processing machine, wherein a tilting table having a clamp unit for clamping a workpiece is tiltably held on a base via a horizontal support shaft, and is arranged corresponding to a processing machine that processes the workpiece. A cylinder chamber is formed in a support hole corresponding to the support shaft, and a piston is slidably fitted to the support shaft and reciprocated in the axial direction by hydraulic pressure supplied to the cylinder chamber. At the same time,
Taper portions corresponding to each other are formed at one end of the piston and a portion of the support shaft corresponding to the one end of the piston, and control the supply and discharge of hydraulic pressure to and from the cylinder chamber. When the tilting table is tilted, the piston is moved so as to separate the taper part of the piston from the taper part of the support shaft, and when the processing machine processes a workpiece, the taper part of the piston is pressed against the taper part of the support shaft. A workpiece tilting support device for a processing machine, characterized in that a hydraulic circuit for moving the piston as shown in FIG.