JPS5826737Y2 - Tire mold processing machine - Google Patents

Description

[Detailed description of the invention] The present invention relates to a mold processing machine for forming vehicle tires, and in particular, it can be used to numerically form a mold for forming automobile tires that has a contact surface, side surface, and corner surface with a complex tread pattern. The present invention relates to a tire mold processing machine for automatically cutting based on control commands from a control device.

As a mold processing machine for forming vehicle tires, a mold material is mounted on a rotating work table, and a cutting tool such as a milling tool that performs various cutting feed movements relative to the mold material is mounted on the main shaft to form a tire mold. Mechanical devices have already been provided for cutting surfaces into the mold blank.

Therefore, the purpose of this invention is to create a mold processing machine for molding vehicle tires that can freely cut molds for molding large-diameter tires for large vehicles to relatively small-diameter tires for light vehicles, etc. It is an object of the present invention to provide a tire mold processing machine which is improved so that cutting debris can be removed satisfactorily during cutting.

According to the present invention, a workpiece rotation head having a mounting face plate for the mold material is provided at a position facing the workpiece rotation head, and a tire is attached to the mold material by performing a feeding motion that cooperates with the rotational movement of the workpiece rotation head. In a tire molding machine equipped with a spindle head for creating a mold surface, the mounting face plate is formed on a mounting surface having a substantially horizontal rotation axis and perpendicular to the axis, and the spindle head is a first turning feed mechanism having a horizontal main axis parallel to the mounting surface of the mounting face plate and rotating the main axis between turning centers in the vertical axis direction within a fixed plane; a second rotation feed mechanism located above and configured to rotate the spindle head around a rotation center in the vertical axis direction located directly below the spindle line; and a second rotation feed mechanism that allows the spindle head to approach the mounting face plate along a constant sliding surface. - A first linear feed mechanism to be separated, and a second linear feed mechanism to linearly slide the spindle head along another constant sliding surface parallel to the mounting surface and in a direction crossing the sliding surface of the first linear feed mechanism. A tire mold processing machine is provided, characterized in that the tire mold processing machine is coupled to an automatic feed mechanism consisting of a linear feed mechanism, thereby imparting a feed motion of a cutting tool, and performs a generating cutting process on the tire mold surface. Ru.

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

FIG. 1 is a partial contour diagram showing an example of a partial contour shape of a vehicle tire. Particularly in the case of an automobile tire, an extremely complicated tread pattern is formed in the contact area A that frequently contacts the ground surface G. Furthermore, a tread pattern is generally formed on the corner area B following the ground contact area A along with various inscriptions, symbols, etc.

In addition, a protrusion corresponding to the vent hole of the mold remains in the side surface area C.

Generally, each of the regions A, B, and C of such a vehicle tire has a curved surface contour with a different radius of curvature, and therefore, the mold surface of the mold is also shaped with tread patterns, engravings, symbols, etc. It must be formed to have a concave curved surface corresponding to the contour of the curved surface along with the release surface.

On the other hand, when the vehicle is a truck or other industrial vehicle, the outer diameter of vehicle tires becomes extremely large, and the inner diameter of the molded surface is correspondingly large. Since the outer diameter of the vehicle tire is also small, the inner diameter of the molding surface is also small.

Therefore, it is desirable for a tire mold processing machine to have the ability to cut complex curved mold surfaces, as well as the ability to process molds of various sizes from small to large diameters. .

Next, the tire mold processing machine according to the present invention will be explained in detail.

Figure 2 is a side view of the tire mold processing machine according to the present invention.
FIG. 3 is a front view taken in the direction of the line ■-■ in FIG. 2, and FIG. 4 is a partially reduced plan view taken in the direction of the line L-IV in FIG.

1 to 3, a work head 10 is fixedly installed on the upper part of a machine base 9, and a disk-shaped work mounting face plate 14 is rotatably supported on the front surface of the work head 10.

That is, the central rotating shaft 14b of the workpiece mounting face plate 14 is firmly supported within the workhead 10 by a bearing means, and the rotating shaft 14b is equipped with a device consisting of a drive source, a 7-marsmoke, and a worm-worm wheel mechanism. Force is transmitted.

The workpiece mounting face plate 14 has a diameter of approximately 1500
It is formed on a large face plate with CIILm"'), and for example o.oo
The rotation is controlled to rotate by i degrees.

Further, the workpiece mounting face plate 14 has a mounting surface 14a (in this example, a vertical mounting surface) and has a chuck jaw 16 (for example, 4
A claw chuck) is provided so as to be slidable in a groove extending in the radial direction between the center and the outer edge of the mounting surface 14a according to the size of the workpiece.

The mounting surface 14a is further provided with an appropriate number of radial elongated holes effective for rigidly holding the workpiece, similar to the well-known face plate structure.

A so-called workpiece processing section is provided on the base 9 opposite the workpiece mounting face plate 14.

In this workpiece machining operation section, a spindle head 20 to which the cutting tool T is attached has a rotating spindle 20a (horizontal rotating spindle in this example) and is integrally formed with a mounting bracket 22. It is fixed with screws.

The rotating main shaft 20a of the main shaft head 20 is connected to the main shaft drive motor 24 which is also installed on the base 36, and the main shaft motor pulley 2
6. Rotationally driven by the rotational driving force transmitted through the pulley belt 28, tension boob 930, and drive belt 32, and the rotational speed is adjusted appropriately according to the number of gears designed in advance between the main shaft motor pulley 26 and the tension pulley 30. The speed of the belt 28 can be selected and set by changing the speed of the belt 28.

Note that since the spindle head 20 is fixed to the base 36 by the fixing bolt 23 as described above, it is also possible to replace it with another similar spindle head 20 by unlocking the fixing bolt 23, for example. In order to cut a narrow corner of a workpiece, it is also possible to replace the spindle head 20 with a spindle head 20 in which the outwardly protruding shaft length of the spindle 20a is formed to a length that avoids mechanical interference.

The upper stand 36 is placed on the intermediate stand 38, and the intermediate stand 38
The mounting surface 14a of the mounting face plate 14 along the horizontal sliding surface Zm of
A well-known dovetail engagement is formed between the two for sliding movement in an axial direction parallel to the .

The sliding displacement of the upper stand 36 with respect to the intermediate stand 38 is the square shaft 40.
It is formed so that it can be started by manually rotating the upper table 36 with a suitable manual crank via a feed screw mechanism (not shown) inserted between the upper table 36 and 38, and in this way, the upper table 36 is By slidingly displacing the stand 38 by manual operation, the cutting tool T attached to the spindle head 20 can be moved from the center of the mounting face plate 14 toward the outer edge or in the opposite direction.

On the other hand, the intermediate stand 38 is placed on the upper surface of a second intermediate stand 42 having a swivel base 44, and the second intermediate stand 42 has a swivel base 44.
A protruding shaft 46 protruding vertically upward from one end of the rotary shaft 2 is fitted via a rotary bearing means 48.

That is, the intermediate stand 38 is formed on the upper surface of the second intermediate stand 42 so as to be able to pivot and slide around the protruding shaft 46.

At this time, the vertical axis of the protruding shaft 46 is the main shaft 20a of the main spindle head 20.
In other words, the axial center of the protruding shaft 46 and the axial center of the main shaft 20a are arranged in a perpendicular relationship.

Therefore, the cutting edge of the cutting tool T attached to the spindle head 20 can turn left and right on the circumference about the vertical axis of the protruding shaft 46 by the above-mentioned turning and sliding movement of the intermediate stand 38.

The swinging and sliding movement of the intermediate stand 38 meshes with the worm wheel of the worm wheel bracket 50 integrally formed on the intermediate stand 38 and the worm shaft coupled to the swing drive pulse motor 54 attached to the second intermediate stand 42. Accordingly, it is configured to be driven for precise turning in response to the pulse input input to the pulse motor 54.

In the case of this embodiment, the amount of rotation of the intermediate stand 38 with respect to the protruding shaft 46 is designed to be within a range of about 45 degrees from the viewpoint of structural convenience of the machine, and as will be clear from the description below. This turning angle range allows the tire mold to fully demonstrate its ability to process curved surfaces.

Further, the engaging portion of the worm and worm wheel is precisely machined so that the turning angle is precisely 0.001 degrees per pulse input to the pulse motor 54.

On the other hand, the swivel base 44 of the second intermediate stand 42 is
The swivel base 44 is placed on the upper surface of the straight table 56, and when the fixing bolt 44a is loosened, the swivel base 44 is placed on the top surface of the straight table 56.
By manually rotating the second intermediate platform 42, the second intermediate platform 42 can be simultaneously rotated 360 degrees on the upper surface of the first linear platform 56.

By the rotation of the second intermediate stand 42, the upper intermediate stand 38,
The upper stand 36 and the spindle head 20 are also rotated 360 degrees about the center of rotation of the swivel base 44.

Further, the first linear platform 56 is placed on the second linear platform 58, and can slide horizontally from side to side along the sliding surface XNC of the second linear platform 58 parallel to the mounting surface 14a of the mounting face plate 14. is formed.

That is, as is clear from FIG. 2, the circular tables 56 and 5B are formed to be slidable by engaging with the dovetail grooves and using the surface XNC as a sliding surface.

The four sliding movements of the first linear table 56 are performed by the rotational drive of the linear drive pulse motor 60 through a well-known precision feed screw mechanism provided between the output shaft of the linear drive pulse motor 60 and the second linear table 56. It is designed to be activated by

On the other hand, the second rectilinear table 58 is mounted on the upper surface ZNC of the first lower table 62 and is formed to be slidable in a direction perpendicular to the mounting surface 14a of the mounting face plate 14.

That is, as shown in FIG. 3, a dovetail groove engaging portion is provided between the circular pedestals 58 and 62, and the distance is adjusted along the horizontal plane ZNC of the first lower pedestal 62 in a direction perpendicular to the mounting surface 14a. sliding 4
It is now possible to create.

The linear sliding motion of the second translational table 58 is activated by the rotational drive of the linear drive pulse motor 64 via a well-known precision feed screw mechanism provided between the pulse motor 64 and the second translational table 58. It has become so.

Incidentally, the amount of linear drive displacement by each of the linear drive pulse motors 60 and 64 of the first linear platform 56 and the second linear platform 58 can be visually observed by the scales 72 and 74, respectively. The linear sliding displacement is automatically controlled by connecting the present processing machine to a numerical control device and operating each pulse motor 60.degree. 64 in accordance with the command pulse input of the numerical control device.

Note that the swing drive pulse motor 54 described above is also operated in accordance with command pulse input from this numerical control device.

Now, the second lower stand 62 is placed on the horizontal upper surface XM of the first lower stand 66, and along the horizontal upper surface XM with respect to the first lower stand 66 by the dovetail groove engagement portion shown in FIG. Mounting face plate 1
It is formed to be slidable in the horizontal direction parallel to the mounting surface 14a of No. 4.

The horizontal sliding of the second lower stand 62 is achieved by manually rotating the square shaft 68 using an appropriate manual crank means.
8 and the second lower base 62.

Further, the first lower stand 66 is placed on the sliding surface ZM formed on the upper surface of the base 9, and is slidable in a direction perpendicular to the mounting surface 14a of the mounting face plate 14 in the far and near directions. Formed to get.

This linear sliding movement of the first lower stand 66 is activated by a gear mechanism inserted between the square shaft 70 and the first lower stand 66 by manually rotating the square shaft 70 by a suitable rank means. .

Note that 76 is the first lower stand 6 after the first lower stand 66 slides straight.
6 to the base 9.

Further, the manual linear sliding amount of the second lower stand 62 and the first lower stand 66 is configured to be readable by a scale 78.80.

The amount of straight-line sliding by the second lower stand 62 is formed so that it can slide over a valve with a linear dimension larger than the radius of the circular mounting face plate 14, and the amount of straight-line sliding by the first lower stand 66 is at least as large as the radius of the circular mounting face plate 14. - The main shaft 2 of the upper part according to the sliding movement of the lower stand.
0 can sufficiently approach the mounting face plate 14 and move away from the mounting face plate 14 integrally.

In addition, in FIG. 2, on the back side of the mounting face plate 14 opposite to the mounting surface 14a, there is a vibration isolator 1 fixed to the work head 10.
The tip pads 8 are disposed in a substantially contacting state, and act as a steady rest when the mounting face plate 14 rotates.

The tire molding operation of the tire molding machine according to the present invention having the above-mentioned configuration will be described below.

Now, when cutting a vehicle tire mold having an outline shape as shown in Fig. 1 using the tire mold processing machine of the present invention, the mold material is first rough-processed using, for example, a lathe. .

After this rough machining is completed, the mold is machined to perform precise machining of the curved surface of the mold.

FIG. 5 shows that the mold material W, which has been rough-processed using a lathe or the like as described above, is fixedly held on the mounting surface 14a of the mounting face plate 14 of the present tire molding machine by the chuck claws 16.
On the other hand, it is a plan view showing a state in which the spindle head 20 of the cutting working part is located in front of this mold material W.

In addition, in FIG. 5, the mold material W is shown in cross section, and the inside broken line W of this mold material W.

indicates a rough machining line, and a solid line W1 indicates a final finishing line.

At this final finish line W1, the ground mold curved surface area A has a large radius of curvature R1, the corner mold curved surface area B has a small radius of curvature R2, and the side mold curved surface area C has a radius of curvature R2. It has a radius of curvature R3 intermediate between the radius of curvature R1 and the radius of curvature R1.

Note that the processing progress order of each of these curved surface areas A, B, and C may be performed sequentially from the outermost area A to the innermost area C.

When the work material W is attached to the mounting face plate 14 as described above and the centering and clamping operations are completed, the cutting tool T attached to the spindle 20a of the spindle head 20 is finally inserted into the mold material W as shown in FIG. In the step of setting the machining surface, first, in the cutting operation section, the spindle head 20 is cut according to the size of the mold material W by manual linear sliding of the first lower stand 66 and manual linear sliding of the second lower stand 62. Set the processing tool T near the processing surface.

Next, the upper table 36 is used to process the curved surface area A of the ground plane mold.
By manually adjusting and sliding on the intermediate stand 38, the dimensional distance from the axis 46a of the protruding shaft 46 to the tip of the cutting tool T is precisely set to be equal to the radius of curvature R1 of the area A.

FIG. 6A is a plan view illustrating a state in which the setting of the cutting tool T for cutting the area A has been completed in this way, and for convenience, the illustration is based on the final finish line ω.

When the setting of the cutting tool T is completed, processing of the mold curved surface in area A is started.

That is, the numerical control device issues commands to the pulse motor provided in the drive device 12 of the mounting face plate 14, the swing drive pulse motor 54 of the intermediate platform 38, and the linear drive pulse motors 60, 64 of the first and second translation platforms 56 and 58. When the pulse is applied, a tread pattern forming mold to be formed on the ground contact surface of a vehicle tire is cut into a curved surface area A of the ground contact mold having a radius of curvature R1.

It goes without saying that the numerical control device has a cutting nib program stored in advance in program means such as tape means.

FIG. 6B is a plan view showing a state in which cutting is performed on region A of the mold material W, and the spindle head 20 has a radius corresponding to the radius of curvature R1 centered on the axis 46a of the protruding shaft 46. It is shown in a rotating state.

FIGS. 7A and 7B show a state in which a corner area B with a radius of curvature R2 (see FIG. 5) is cut after cutting of area A with a radius of curvature R1 is completed.

In this case, one notable feature of this invention is:
Since the radius of curvature R2 is small, the radius center 64a' of region B
Since it is impossible to align the rotation center 64a of the headstock 20 with the rotation center 64a of the spindle head 20, when cutting this area B, the rotation movement around the rotation center 64a of the spindle head 20 and the first and second translation tables 56 are necessary. .58 in two orthogonal horizontal directions are combined to creatively impart a turning motion about the center 64a' to the machining tool T.

Of course, such a generating motion can be easily generated by numerically controlling the intermediate platform 38, the first and second linear platforms 56 and 58 by synthesizing and storing each momentum in a program stored in a numerical control device in advance. It is possible to make movement a reality.

Further, when the rotation drive amount by the rotation drive pulse motor 54 of the intermediate stand 38 is continuously cut in areas A and B, the amount of rotation angle allowed between the worm wheel of the worm wheel bracket 50 and the worm 52, for example, 45 If the cutting speed exceeds the range, the second intermediate stand 42 may be rotated by an appropriate amount on the swivel base 44 after the cutting of the area A is completed, and then the cutting of the area B may be started.

FIG. 1A shows that the spindle head 20 is rotated in this way using the swivel base 44 via the second intermediate stand 42 to
Fig. 7B shows the spindle head 20 at the end of the cutting process in area B.
This shows the turning state of the

8A and 8B similarly show the positional relationship of the spindle head 20 at the start of cutting and at the end of cutting when cutting of area C is performed after cutting of areas A and B in mold material W is completed. This is what is shown.

When cutting the region C having the radius of curvature R3, the radius of curvature R3 is again relatively large, and the axis 4 of the protruding shaft 46
The distance dimension from 6a to the tip of the cutting tool T is
It is possible to match the radius of curvature value R3 by adjusting the sliding movement of 6, and therefore there is no need to realize the innovative pivoting movement of the spindle head 20 in cutting the area B.

However, in this case as well, the spindle head 2 continues from area B.
Since turning the spindle head 20 around the axis 46a at once would exceed the allowable turning amount, a cutting method is adopted in which the spindle head 20 is turned in advance via the second intermediate stand 42 using the swivel base 44.

As is clear from the above description, according to the present invention, the pivoting operation of the mounting face plate 14 having a substantially horizontal rotation axis and the mounting surface 14a perpendicular thereto, and the pivoting operation about the axis 46a of the spindle head 20 , the four-axis linear movement applied to the spindle head 20 via the first and second translation tables 56 and 58 is controlled by a numerical control method by inputting commands from a numerical control device,
The mold material W can be machined to form a mold for a vehicle tire.

In addition, in the cutting process from FIG. 5 to FIG. 8A and FIG.
The main spindle head 20 with a relatively long shaft length protruding from 6a is used to prevent interference during cutting, but if there is no risk of such interference, the above-mentioned method as shown in FIG. It is also possible to use a spindle head 20 in which the protruding shaft length of the spindle head 20a is relatively short.

In any case, the above-described configuration in which the main shaft 20a of the main spindle head 20 can rotate about the axis 46a of the protruding shaft 46 located directly below it is useful for automating the cutting of concave curved surfaces with various radii of curvature, especially at corners. However, it is extremely advantageous in that it facilitates programming and ultimately achieves uniform and highly accurate automatic machining over the entire inner circumference of the tire mold.

Further, according to the tire mold processing machine according to the present invention, since the mounting face plate 14 of the work head 10 has a structure in which the mounting face plate 14 can rotate in a substantially vertical plane, the removal of chips can be performed in accordance with the rotation of the mounting face plate 14. This is carried out automatically, and therefore has the effect of maintaining the cutting resistance of the cutting tool T at a low level, achieving high machining accuracy and extending tool life.

In this case, another advantage of the present invention is that the entire processing machine can be installed with a slight rightward tilt, for example in the clockwise direction in FIG. 2, to further enhance the chip removal effect.

Moreover, according to the present invention, since the spindle head 20 can be manually positioned in advance at the cutting position depending on the size of the mold diameter, it can be used in a wide range of applications, from tire molds for large vehicles to tire molds for small vehicles. It also has the advantageous effect of allowing cutting to be carried out freely.

[Brief explanation of the drawing]

Figure 1 is a partial contour diagram showing the contour shape of a vehicle tire;
4 to 4 are side views, front views, and partially reduced plan views of the tire mold processing machine according to the present invention, and FIGS. 5 to 8A and 8B illustrate the cutting operation of the tire mold processing machine according to the present invention. FIG. 9 is a partial plan view for explaining the cutting state when the spindle head is different. In the figure, 9... Base, 10... Work head, 12... Drive device, 14... Mounting face plate, 14a... Vertical mounting surface, 16...
...Chuck jaw, 20...Spindle head, 20a...
...Main shaft, 24...Main shaft drive motor, 36
...Upper stand, 38...Middle stand, 42...
...Second intermediate stand, 44...Swivel base, 46...Protruded shaft, 46a...Protruded shaft axis, 48...Rotation bearing , 54...Turning drive pulse motor, 56...-th straight platform, 58...
...Second straight platform, 60, 64... Straight drive pulse motor, 62... First lower platform, 66...
...Second lower platform.

Claims (1)

[Claims for Utility Model Registration] 1. A work rotation head having a mounting face plate for a mold material and a workpiece rotation head provided at a position facing the work rotation head, and by performing a feeding motion that cooperates with the rotational movement of the work rotation head. In a tire mold processing machine equipped with a spindle head for creating a tire mold surface on a material, the mounting face plate is formed on a mounting surface perpendicular to the axis having a substantially horizontal axis of rotation; The spindle head has a horizontal axis parallel to the mounting surface of the mounting face plate, and a first swing feed mechanism that rotates the main axis to a pivot center opening in a vertical axis direction within a fixed plane; a second rotation feed mechanism located above the mechanism and configured to rotate the spindle head around a rotation center in the vertical axis direction located directly below the spindle line; and a constant horizontal sliding surface for the spindle head with respect to the mounting face plate. a first linear feed mechanism that moves the spindle toward and away from the main shaft along the mounting surface; A tire mold processing machine characterized in that it is coupled to an automatic feed mechanism consisting of a second sliding linear feed mechanism, thereby imparting a feed motion of a cutting tool, and performs a generating cutting process on the surface of the tire mold. . 2 Utility Model Registration Scope of Claims In the tire mold processing machine as set forth in claim 1, the spindle head is manually operated together with the automatic feed mechanism to bring the cutting tool cutting edge at the tip of the spindle head close to the mold material on the mounting face plate in advance. A tire mold processing machine coupled to a manual feed mechanism including a rotating table and third and fourth manual linear feed mechanisms arranged parallel to the first and second linear feed mechanisms, respectively.