JP4734327B2 - Valve hole machining method and valve hole machining apparatus for wheel rim for automobile - Google Patents

Description

  The present invention relates to a valve hole machining method and a valve hole machining apparatus for an automobile wheel rim in which a valve hole for mounting an air valve is formed at a predetermined portion of the automobile wheel rim.

  An automobile air wheel is provided with an air valve for adjusting the air pressure in the tire. This air valve is attached to a valve hole formed in, for example, a well portion that rises from a drop portion to a front bead seat portion of a wheel rim that constitutes an automobile wheel. Here, the air valve is generally attached so as to protrude from the outer peripheral side of the wheel rim to the inner peripheral side. For this reason, a mounting seat surface for stably mounting the air valve is also formed on the outer surface of the well portion around the valve hole. The mounting seat surface and the valve hole are usually strictly defined in their positional relationship.

  Here, since the punch for punching the valve hole and the punch for pressing the mounting seat surface have different molding conditions such as shape and pressure, it is common to use separate processing devices. It is. That is, after the mounting seat surface is formed by the processing device provided with the punch for forming the mounting seat surface, it is transferred to the processing device provided with the punch for opening the valve hole, and the valve is processed by the processing device. Holes were to be formed. For this reason, when the wheel rim for an automobile is transferred between the respective processing apparatuses, the wheel rim for the automobile is accurately attached to each processing apparatus so that the mounting seat surface and the hub hole can be formed according to a predetermined positional relationship. It was necessary to be positioned on.

And, as a method of forming the valve hole and the mounting seat surface at an accurate position, for example, as in Patent Document 1, by fixing the wheel rim for an automobile to the rotary table, the rotary table is index-rotated, A configuration has been proposed in which the wheel rim for an automobile is sequentially transferred to a processing device for forming a mounting seat surface and a processing device for forming a valve hole. The wheel rim can be accurately positioned on each device by the rotary table that rotates in this manner, and the mounting seat surface and the valve hole can be formed according to a predetermined positional relationship.
Japanese Patent Laid-Open No. 7-314225

  By the way, as described above, the processing device for forming the mounting seat surface and the processing device for forming the valve hole have a configuration in which the wheel rim for the automobile is fixed and transferred to the rotary table that rotates the index, It is not possible to eliminate the influence of the clearance of the driving device for rotating the rotary table and various power transmission members interposed between the driving device and the rotary table. For this reason, there is a limit to the accuracy of the positional relationship between the mounting seat surface and the valve hole. Further, in the wheel rim manufacturing process, there is a limit to the stability of the positional relationship between the formed mounting seat surface and the valve hole due to the influence of the clearance of the device.

  In addition, since the burr is generated at the hole edge of the valve hole after the valve hole is drilled, a step of removing the burr is necessary. For example, in the configuration in which the above-described rotary table is arranged, a deburring device is provided, and an automobile wheel rim is transferred to the device by the rotary table. Such a process of removing burrs not only complicates the processing process of the valve hole, but also has an adverse effect on shortening and shortening the production line of the automobile wheel. For this reason, there is a need for a method for processing a valve hole that does not cause such burrs.

  The present invention relates to a method for machining a valve hole in a wheel rim for an automobile, and a valve hole, which can accurately and stably form a mounting seat surface and a valve hole in a predetermined portion of the wheel rim for an automobile, and prevent the occurrence of burrs. A processing device is proposed.

  The present invention relates to an automotive wheel rim valve hole processing method for forming a valve hole for mounting an air valve at a predetermined portion of a wheel rim, and an annular seat punch for pressing the mounting seat surface of the air valve, and a seat punch The hole punch that is inserted into the guide hole formed in the hole and drills the valve hole is held in a seat processing mode in which the hole punch does not protrude from the countersunk punch, and then the seat processing mode is maintained. On the other hand, by pressing the wheel rim, the first processing step for forming the mounting seat surface and the press punch and hole punch are separated from the wheel rim so that the press punch does not contact the mounting seat surface. Then, a punching hole is punched in the wheel rim to sequentially execute a second machining step for forming a valve hole, a clamp means for supporting the wheel rim from the machining side, By a rim support means for supporting from the back side, from the first processing step up to the second processing step is a method which is characterized in that so as to persist wheel rim.

  Here, as the countersinking mode, the countersunk punch and the punched hole are formed so that the processing surfaces thereof are substantially flush with each other, and the processing surface of the punching punch is retracted from the processing surface of the countersink punch. It may be any of the case of the concave shape.

  In this method, the perforated punch and the countersunk punch are configured such that the perforated punch is inserted into a guide hole provided in the annular countersunk punch, so that the perforated punch extends along the guide hole. In addition to being movable, the positional relationship between both punches is predetermined. Then, the mounting seat surface is formed by using the countersunk punch and the perforated punch as a seat processing mode, and the valve hole is formed by projecting the perforated punch from the perforated punch and piercing the wheel rim. Accordingly, the mounting seat surface and the valve hole are formed in the fixed automobile wheel rim in accordance with the above-described aspect of the hole punch and the presser punch. That is, the mounting seat surface and the valve hole can be accurately and stably formed in a predetermined positional relationship, and high accuracy can be maintained. In addition, this method can be executed by a single processing apparatus by using the above-described configuration of the perforated punch and the countersunk punch and controlling and executing the first processing step and the second processing step. is there. For this reason, as in the conventional configuration described above, an apparatus for moving an automobile wheel rim between two processing apparatuses is not required, and the line length and manufacturing time of the production line can be shortened. There are also advantages.

Here, by explaining the circumstances leading to the present invention, it is shown that according to the present method, it is possible to prevent occurrence of burrs having a size that requires a removal operation at the hole edge of the valve hole.
The present inventor has intensively studied a method for forming the valve hole and the mounting seat surface with a single processing device, aiming at shortening the valve hole processing step. As a result, after forming the mounting seat surface by holding and pressing the annular seat punch and the punch punch inserted through the guide hole so that the punch does not protrude from the seat punch, A configuration has been invented in which the valve hole is formed by separating the hole punch once from the seating punch and making a hole. Here, the press punch and the punch punch are arranged in a general press machine and reciprocating between the top dead center and the bottom dead center of the press machine to perform the pressing process and the punching process. I tried to do it sequentially. However, in this method, a relatively large burr is generated at the hole edge of the valve hole after the valve hole is formed, and a step for removing the burr is necessary as in the conventional method. Since the burr generated when punching with a punch is generally considered to be due to the clearance between the punch and the die that receives the punch, both were optimized, but the relatively large burr was eliminated. I couldn't. Therefore, the present inventor repeated further diligent studies and reached the cause of the generation of relatively large burrs. The reason for this is that the punch was held and pressed so that it did not protrude with respect to the countersunk punch, and was once separated, and the punch was protruded from the countersunk punch and punched. The mounting pressing surface that was spring-backed after processing was pressed again by the pressing punch at the time of drilling. That is, at the time of drilling processing, the pressing punch presses the spring-backed mounting seat surface, so that the punch punching through the wheel rim is tightened, and when the punch punch is pulled out, The material of the hole edge of the valve hole flowed in the drawing direction according to the hole punch, and a relatively large burr was generated.

  Thus, by ascertaining the cause of the generation of relatively large burrs, the present invention has been made, and when the perforated punch pierces the wheel rim, it prevents the pressing punch from contacting the mounting seat surface, Prevents perforated punches from being tightened. Accordingly, when the hole punch is pulled out from the valve hole, it is possible to prevent the material of the hole edge of the valve hole from flowing in the pulling direction and generating a relatively large burr. This eliminates the need for a step (apparatus) for removing burrs as in the conventional configuration described above, and can shorten the valve hole processing step.

  Thus, according to the method of the present invention, the mounting seat surface and the valve hole can be accurately and stably formed in a predetermined portion of the wheel rim according to a predetermined positional relationship. It can be formed without generating burrs that need to be removed at the edge of the hole.

  On the other hand, as a processing device that embodies the valve hole processing method described above, the present invention presses the mounting seat surface of the air valve, and an annular seat punch having a guide hole formed along its moving direction. And the valve hole is drilled. The hole punch, which is movably inserted into the guide hole provided in the countersunk punch, and the hole punch and the countersunk punch, The seat processing mode that does not protrude with respect to the punch, and the hole processing mode in which the perforated punch protrudes from the countersunk punch, the punch transformation holding means that is held in each mode, and the seat that is held in the seat processing mode A pressing process for pressing the press punch on the wheel rim to form a mounting seat surface, a retracting operation for separating the pressing punch and the hole punch from the wheel rim, and holding the hole punching mode, and a hole processing mode Hold A drive control means for sequentially executing a hole punching operation for forming a valve hole by drilling a hole punch into the wheel rim so that the punch does not contact the mounting seat surface, and a hole from the start of the pressing process operation by the drive control means. Clamping means for supporting the wheel rim from the processing side until the end of the opening processing operation, and a rim for contacting the wheel rim from the back side, provided with a die that contacts the back surface of a predetermined portion of the wheel rim forming the mounting seat surface And a supporting means.

  In this configuration, the punch transformation holding means includes a countersunk punch and a hole punch, a hole machining punch in which the hole punch does not protrude from the hole punch, and a hole in which the hole punch protrudes from the hole punch. Transformation is maintained in the processing mode. Further, the drive control means executes each operation of forming the mounting seat surface and the valve hole respectively by using the countersink punch and the hole punch. Accordingly, the above-described valve hole machining method can be practiced with a single device, and the same effects as the above-described valve hole machining method can be exhibited.

  Here, since the wheel rim for automobiles is held by the clamp means and the rim support means while the drive control means performs the pressing process operation, the retreat operation, and the hole opening process operation, Even if a load is applied, the position of the wheel rim will not be displaced. Therefore, the mounting seat surface and the valve hole can be accurately and stably formed at a predetermined portion of the wheel rim according to the mode of the press punch and the hole punch.

  As the punch transformation holding means described above, the hole punch is changed in position with respect to the punching punch and transformed into the seating mode and the hole punching mode, or conversely, the punching punch is used as the punching punch. Any configuration that converts the position may be used. Further, as the retracting operation by the drive control means, when the perforated punch is transformed into a perforating mode that protrudes from the countersunk punch, the perforated punch machining surface is separated from the wheel rim and the next perforated processing is performed. It is preferable that the punching punch is separated from the wheel rim by a distance that allows the valve hole to be properly formed by piercing the wheel rim. By this retreat operation, the operational effects of the present invention can be properly exhibited.

  In addition, in the seat processing aspect of this configuration, as described above, the processing surface of the punch punch and the case where the processing surface of the punch punch and the punch punch are made substantially flush with each other. However, it can be any of the case where it retracts with respect to the processing surface of the press punch. In the seat processing mode in which the processing surfaces of the countersunk punch and the perforated punch are substantially flush, the perforated punch also presses the wheel rim by the press processing operation. On the other hand, when the hole punch is retracted relatively large in the seating mode in which the hole punching hole is retracted with respect to the hole punching punching surface, Does not press the wheel rim.

  Further, as another processing apparatus that embodies the above-described valve hole processing method, the present invention presses the mounting seat surface of the air valve, and an annular seat in which a guide hole is formed along its moving direction. A punch punch and a valve hole are drilled. A punch punch that is movably inserted in a guide hole provided in the countersunk punch, and a seat that does not protrude from the countersunk punch. Perforating punch drive control means for performing a seating holding holding operation for holding in a machining mode, and a hole punching operation for perforating a valve hole in a wheel rim by projecting the hole punch from a seat pressing punch; While maintaining the seat processing mode by the seat processing holding operation of the punch drive control means, the press processing operation for pressing the counter press punch to the wheel rim, and the press punch and the punch punch are separated from the wheel rim. Drive control means for holding the countersunk punch in position and sequentially performing a retracting operation in which the hole punching operation is executed by the hole punch drive control means; from the start of the pressing operation to the end of the hole punching operation A clamping means for supporting the wheel rim from the processing side, and a rim supporting means for supporting the wheel rim from the back side provided with a die that contacts the back surface of a predetermined portion of the wheel rim forming the mounting seat surface. It is characterized by being.

  In such a configuration, after the punching punch drive control means holds the punching punch in the seat machining mode, the drive control means performs the pressing process operation to form the mounting seat surface, and then the retraction operation is performed. The punch drive control means projects the hole punch so as to pierce the wheel rim and perform a hole forming operation for forming a valve hole. Since the above-described valve hole machining method can be practiced with a single apparatus having this configuration, the same effects as the above-described valve hole machining method can be exhibited.

  Even in this configuration, the vehicle wheel rim is held by the clamp means and the rim support means while the pressing process operation, the retracting operation, and the hole opening process operation are being performed. According to the embodiment of the punch and the hole punch, the mounting seat surface and the valve hole can be accurately and stably formed at a predetermined portion of the wheel rim.

  Even in the seat machining mode of the present configuration, as described above, when the countersunk punch and the punch punch are made to be substantially flush with each other, the machining surface of the punch punch However, it can be any of the case where it retracts with respect to the processing surface of the press punch. In the seat processing mode in which the processing surfaces of the countersunk punch and the perforated punch are substantially flush, the perforated punch also presses the wheel rim by the press processing operation. On the other hand, in the seat machining mode in which the machining surface of the perforated punch is retracted relatively large with respect to the machining surface of the countersunk punch, the perforating punch does not press the wheel rim by the pressing process operation.

  Further, in the valve hole machining apparatus described above, the clamping means is provided so as to be able to move integrally with the countersunk punch by driving of the drive control means. And a urging means for urging the contact in the moving direction, a position where the press punch is pressed against the wheel rim by the pressing operation, and the press punch is moved to the wheel rim by the retracting operation. A configuration is proposed in which the contact is elastically brought into contact with the spaced-apart position separated from the processing side surface of the wheel rim.

  In such a configuration, the contactor is pressed against the processing side of the wheel rim and the wheel rim is pressed from the processing side with sufficient stepping pressure while the pressing processing operation, the retraction operation, and the hole opening processing operation are performed. It can be made elastic. That is, the clamp means of this configuration moves integrally with the countersunk punch and the punch with a hole when the contact is not in contact with the wheel rim. When the pressing process operation is executed, the contactor comes into contact with the wheel rim prior to the pressing punch and the hole punching, and a stepping pressure is generated as the pressing operation proceeds to press the wheel rim. Further, when the retracting operation is performed and the presser punch is separated from the wheel rim, the contactor maintains the state in which the wheel rim is pressed without losing the stepping pressure. Thereafter, the contactor presses the wheel rim with the stepping pressure until the drilling operation is executed and the valve hole is formed. After the drilling operation is finished, the countersunk punch and the punch are separated from the wheel rim. Then, when the contact is also separated from the wheel rim, it will move together again.

  In this way, the clamping means of this configuration is such that the wheel rim can be supported by a sufficient force by pressing the wheel rim from the processing side in accordance with the operation of the press punch and the hole punch by the drive control means. Together with the rim support means, the mounting seat surface is continuously held from the start of processing to the end of processing of the valve hole. Therefore, as described above, the wheel rim does not move between the pressing process of the mounting seat surface and the drilling process of the valve hole, and the mounting seat surface and the valve hole are accurately and stably formed with higher accuracy. it can. In addition, the clamp means does not require a drive device or the like in addition to the drive control means. Thus, the clamping means can properly support the wheel rim from the processing side with a relatively simple configuration.

  Here, in the retracting operation, the position where the press punch is separated from the wheel rim is closer to the wheel rim than the position where the contactor first contacts the wheel rim by the pressing process described above. That is, the separation position in the retreat operation is a position closer to the wheel rim than the position where the punch is farthest from the wheel rim (for example, top dead center in a press machine).

As described above, the present invention holds the annular press punch and the punch punch inserted through the guide hole in the seat processing mode, and presses the wheel rim to form the mounting seat surface. And the second machining step for forming the valve hole by punching the hole punch without making contact with the press punch, and sequentially performing the process from the first machining step by the clamping means and the rim support means. This is a valve hole processing method in which the wheel rim is held until the second processing step. In addition, as a first apparatus that embodies this processing method, it has punch transformation holding means for converting and holding the press punch and the hole punch into the seat processing mode and the hole processing mode, and forms a mounting seat surface. Drive control means that sequentially executes a pressing process operation, a retracting operation that transforms from the seat processing mode to the hole processing mode once separated, and a drilling operation that forms a valve hole. Until the hole drilling operation, a clamp means for supporting the wheel rim from the processing side and a rim support means for supporting from the back side are provided. Alternatively, as a second device, a punching punch drive control means for executing a seating processing holding operation for holding the countersunk punch and the punching punch in a seating manner and a punching operation for projecting the punching punch. And a drive control means for executing a pressing operation for forming the mounting seat surface and a retreating operation for temporarily holding the holding punch in the separated position, and further from the pressing processing operation to the drilling operation. The clamp means for supporting the wheel rim from the processing side and the rim support means for supporting the wheel rim from the back side are provided.
These processing methods and processing apparatuses have the following effects.
(1) The mounting seat surface and the valve hole can be accurately and stably formed in a predetermined portion of the wheel rim according to a predetermined positional relationship. Thus, it is possible to reliably comply with product standards that strictly define the positional relationship between the mounting seat surface and the valve hole.
(2) Since the hole punching of the valve hole is performed by punching the hole punch in the wheel rim without contacting the mounting seat surface, the burr having a size that requires removal work is generated. Can be prevented.
(3) In this processing method and processing apparatus, the mounting seat surface and the valve hole are formed by a single device, and the deburring operation is not required as described above. It is possible to shorten the manufacturing time of the automobile wheel and reduce the manufacturing cost as a whole.

  The clamp means is provided so as to be movable integrally with the presser punch by driving of the drive control means, the contact means elastically contacting the processing side surface of the wheel rim, and the contact Biasing means for urging the wheel rim in the moving direction, and the contact between the position of the pressing punch during the pressing operation and the spacing position of the pressing punch during the retraction operation It was set as the structure which made the tread pressure generate | occur | produced on the process side surface, and was elastically contacted. With this configuration, the wheel rim is pressed by the stepping pressure from the start of the pressing process to the end of the drilling process, and the wheel rim is fixed in the correct position even when machining the countersunk punch or punching punch. Excellent effect. Therefore, the accuracy of forming the mounting seat surface and the valve hole at the specified position is also stable and high.

1 is a cross-sectional view of a steel automobile wheel 1. FIG. It is the schematic showing the valve hole processing apparatus 20 of Example 1. FIG. It is explanatory drawing showing the state which mounted the wheel rim 2 in the lower mold | type 25 of the valve hole processing apparatus 20. FIG. It is explanatory drawing showing the state which formed the mounting seat surface 8 by the press work action | operation. It is explanatory drawing showing the state which spaced apart the punching punch 32 and the perforation punch 34 from the wheel rim, and transformed into the hole processing mode by the retreat operation. It is explanatory drawing showing the state which formed the valve hole 7 by the hole opening process action | operation. It is explanatory drawing showing the state which the contactor 41 contacted the wheel rim 2. FIG. It is explanatory drawing showing the state which the contactor 41 produced stepping pressure and elastically contacted the wheel rim 2. FIG. It is the schematic showing the valve hole processing apparatus 50 of Example 2. FIG. It is explanatory drawing showing the state which mounted the wheel rim 2 in the lower mold | type 25 of the valve hole processing apparatus 50. FIG. It is explanatory drawing showing the state which formed the mounting seat surface 8 by the press work action | operation. It is explanatory drawing showing the state which spaced apart the pressing punch 62 and the punch punch 64 from the wheel rim by retraction | saving operation | movement. It is explanatory drawing showing the state which formed the valve hole 7 by the hole opening process action | operation.

An embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view of a so-called two-piece type steel automobile wheel 1 formed by fitting a wheel rim 2 formed from a steel plate and a wheel disc 3. In this automobile wheel 1, after the disc flange portion 11 formed on the outer peripheral edge of the wheel disc 3 is fitted to the inner peripheral surface of the drop portion 15 of the wheel rim 2, arc welding, spot welding, laser welding, etc. The disc flange portion 11 and the drop portion 15 are joined together by various welding methods.

  Here, after the wheel rim 2 and the wheel disc 3 are molded in separate molding processes, the production line of the automobile wheel 1 is assembled so as to be joined as described above. The wheel disk 3 is formed by pressing a substantially square steel plate (not shown). By this press working, a hub mounting portion 13 having a hub hole 12 at the center is formed, and a disc flange portion 11 is formed outside thereof.

  On the other hand, the wheel rim 2 is formed into a cylindrical shape by butt welding the short sides of a substantially rectangular steel plate material, and then rotating a predetermined die from both the inside and outside of the cylinder. It is formed by roll processing for clamping (not shown). By this roll processing, rim flange portions 16a and 16b that support the sidewall portions of the tire at the opening edges on both sides, and bead seat portions 18a that are respectively coupled to the rim flange portions 16a and 16b and seat the tire beads. 18b and the drop part 15 for dropping the tire bead when the tire is mounted are formed. The bead seat portion 18a on the front side of the wheel is connected to the drop portion 15 via the well portion 17a, and the bead seat portion 18b on the rear side of the wheel is dropped via the ledge portion 19 and the well portion 17b on the back side. It is coupled to the part 15.

  An air valve 5 that adjusts the air pressure in the tire when the tire is mounted is attached to the wheel rim 2 described above. A valve hole 7 for attaching the air valve 5 is formed in the front side well portion 17a of the wheel rim 2 after the above-described roll processing (see FIG. 6). Further, a mounting seat surface 8 for mounting the air valve 5 is formed around the rim outer peripheral surface of the valve hole 7 (see FIG. 4). That is, the air valve 5 penetrates from the outer peripheral side of the rim to the inner peripheral side and is fixed to the mounting seat surface 8. The mounting seat surface 8 is provided in such a manner that the valve hole 7 and the center of both coincide with each other with high accuracy, and is formed in a substantially planar shape in the well portion 17a. In addition, this valve hole 7 is set to the predetermined site | part which left | separated in the circumferential direction from the site | part which welded the short sides of the above-mentioned rectangular board | plate material. The processing step for forming the valve hole 7 is the main part of the present invention and will be described in detail below. In addition, as an apparatus used for a valve hole processing process, two types of valve hole processing apparatuses 20 and 50 are illustrated as an Example.

  FIG. 2 shows a valve hole machining apparatus 20 that forms the valve hole 7 and the mounting seat surface 8 in the wheel rim 2 that has completed the above-described roll machining process. The valve hole machining apparatus 20 according to the first embodiment includes a lower mold base in which a lower mold 25 is disposed that supports a predetermined portion of the front side well portion 17a of the wheel rim 2 that forms the valve hole 7 from the inner peripheral surface thereof. 21, an upper mold base 22 provided with an upper mold 29 that forms the mounting seat surface 8 and the valve hole 7 at the predetermined portion, and the upper mold base 22 is moved up and down in the vertical direction with respect to the lower mold base 21. Drive control device 23 to be operated. Here, the lower mold base 21 is fixed to a floor or the like, and the upper mold base 22 can be moved up and down in a vertical direction according to a guide post (not shown) by driving of a drive control device 23. The drive control device 23 constitutes drive control means according to the present invention.

  The lower die 25 is fixedly disposed on the upper surface of the lower die base 21 and supports the front side well portion 17a of the wheel rim 2 so that a predetermined portion for forming the valve hole 7 is substantially horizontal. To do. The lower die 25 is provided with a perforated punch and a pair of dies 26 described later. Here, the lower die 25 is provided in an arc shape capable of abutting on the inner peripheral surface of the well portion 17a so that the well portion 17a can be supported with a predetermined circumferential length, and a die 26 is provided at the center of the arc. Is arranged. A rim support table 27 that supports a substantially half-circumferential region of the rim flange portion 16 of the wheel rim 2 that is not supported by the lower mold 25 is also disposed in the valve hole machining apparatus 20. The rim support table 27 is provided so as to be tiltable and movable up and down with respect to the lower mold base 21, and the wheel rim 2 has a predetermined portion where the valve hole 7 of the front side well portion 17 a is formed as the lower mold 25. The rim support table 27 supports the wheel rim 2 in this inclined state. The lower die 25 and the rim support table 27 constitute a rim support means according to the present invention.

  On the other hand, the above-described upper mold 29 is fixed to the lower surface of the upper mold base 22 and disposed so as to protrude downward from the upper mold base 22 as shown in FIGS. The upper die 29 includes a substantially U-shaped fixed base 30 fixed to the upper die base 22 and an annular seat punch 32 that presses and forms the mounting seat surface 8 of the air valve on the outer peripheral surface of the well portion 17a. A punch block 31 is provided on the lower surface of the fixed base 30 so as to protrude downward. A guide hole 33 is provided along the vertical direction at the center of the annular presser punch 32, and a hole punch 34 for forming the valve hole 7 in the well portion 17a is inserted into the guide hole 33. ing. In this manner, the perforated punch 34 and the presser punch 32 are arranged so as to be concentric with each other. Here, the vertical direction corresponds to the moving direction according to the present invention.

  Further, the fixed base 30 of the upper die 29 is provided with an elevating air cylinder 37 for moving the above-described perforated punch 34 up and down along the vertical direction with respect to the presser punch 32 at the rear part thereof. A lifting member 40 provided in the front-rear direction in the air space between the fixed base 30 and the upper mold 29 is joined to the lifting air cylinder 37, and moves up and down in accordance with the lifting drive of the cylinder 37. ing. The elevating member 40 is suspended by connecting arms 35 and 35 connected to the perforated punch 34, and the perforated punch 34 is moved in the vertical direction via the elevating member 40 and the connecting arms 35 and 35. It can be moved. That is, by the raising / lowering drive of the raising / lowering air cylinder 37, the perforated punch 34 is formed so that the machining surface 34a is flush with the machining surface 32a of the countersunk punch 32, and the perforating punch 34 is It is possible to transform into a hole machining mode protruding from the punch 32. Here, the length of the perforated punch 34 protruding from the presser punch 32 is determined when the perforated punch 34 penetrates the well portion 17a of the wheel rim 2 set in the lower mold 25 described above. The machining surface 32a of the punch 32 is set so as not to contact the wheel rim 2 (see FIGS. 6 and 8).

  The fixed base 30 is provided with arm insertion holes 36a and 36a through which the connection arms 35 and 35 are inserted, respectively. The punch block 31 has arm insertion holes 36a and 36a. And a movable air space 36 b communicating with the guide hole 33 is provided. Further, the upper die 29 is provided with a stopper 49 for holding the lifting member 40 as described above in a seat processing manner, and the stopper 49 is disposed on the upper die base 22.

  Further, when the perforated punch 34 protrudes from the press punch 32 by the lifting air cylinder 37, the upper die 29 advances into the movable air space 36 b of the punch block 31, and the perforated punch 34 is moved to the upper die 29. A holding member 39 for holding in the hole machining mode is provided. The holding member 39 is disposed so as to advance and retreat in the front-rear direction along the substantially horizontal direction by the holding air cylinder 38 fixed to the rear portion of the fixed base 30 (see FIGS. 3 and 5). . Here, the holding air cylinder 38 retracts the holding member 39 from the movable air space 36b when the perforated punch 34 is in the seating mode, and the movable air region 38 when the perforated punch 34 is in the perforated mode. It advances to 36b and supports the upper surface of the perforated punch 34. With this support, when the perforated punch 34 pierces the well portion 17a, the valve hole 7 can be maintained and the valve hole 7 can be properly formed.

  The above-described lifting air cylinder 37, the holding air cylinder 38, and the holding member 39 constitute the punch transformation holding means according to the present invention.

  Furthermore, the fixed base 30 of the upper die 29 has a press punch 32 so as to come into contact with the outer peripheral surface of the well portion 17a on both sides along the circumferential direction of the portion where the valve hole 7 of the wheel rim 2 is formed. Contacts 41 are disposed on both sides. As shown in FIGS. 7 and 8, the contact 41 includes a stripper bolt 42 having a predetermined movable length, and a stepping spring 43 that is wound around the stripper bolt 42 and biases the contact 41 downward. Is suspended by the fixed base 30. That is, the contact 41 can move in the vertical direction according to the movable length of the stripper bolt 42, and can generate a stepping pressure in which the stepping spring 43 is elastically contracted and pressed downward according to the pressure from below. . When the pressure from below is released, the elastic contraction is released, and the shortened vertical distance extends to the original state. Here, the pressing force spring 43 constitutes the biasing means of the present invention.

  The contacts 41, 41 come into contact with the outer peripheral surface of the well portion 17 a of the wheel rim 2 as the fixed base portion 30 is lowered by driving of the drive control device 23 (see FIG. 7). A stepping pressure is generated by the spring 43 to press the wheel rim 2 (see FIG. 8), and the stepping pressure gradually increases. On the other hand, when the fixed base 30 is lifted from the state where the wheel rim 2 is pressed by the stepping pressure, the stepping pressure gradually decreases, and the contacts 41 and 41 are separated from the well portion 17a. As described above, the contacts 41 and 41 support the wheel rim 2 from the upper side between the predetermined raising and lowering positions in accordance with the lowering and raising of the fixed base 30. That is, the contacts 41 and 41 hold the wheel rim 2 together with the lower mold 25 described above, and hold the wheel rim 2 during the processing by the press punch 32 and the perforated punch 34. .

  The contacts 41 and 41 are suspended from the fixed base 30 so as to protrude downward from the perforated punch 34 in a natural state where the contacts 41 and 41 do not contact the wheel rim 2 and receive no pressure from below. When the apparatus 23 is moved downward, the wheel rim 2 can be contacted before the hole punch 34 and the press punch 32 (see FIG. 7). Accordingly, when the mounting seat surface 8 is processed by pressing or when the valve hole 7 is formed, a stepping pressure is generated to support the wheel rim 2 (see FIGS. 3 and 6). Further, even when the presser punch 32 is separated from the mounting seat surface 8 after the mounting seat surface 8 is formed and transformed from the seat processing mode to the hole processing mode, the contacts 41 and 41 are continuously connected to the wheel rim. 2 can be supported by the stepping pressure (FIGS. 4 and 5).

  The contact distance between the contact elements 41 and 41 depends on the movable length of the stripper bolt 42, and the vertical distance that can be supported by contacting the wheel rim 2 is determined. Here, the contacts 41, 41 may be set within a range in which the wheel rim 2 can be elastically contacted between the pressing process by the hole punch 34 and the counter press punch 32 and the hole punching process. Therefore, the movable length of the stripper bolt 42 is such that the contacts 41 and 41 come into contact with the punch block 31 from a position closer to the wheel rim 2 than the drive upper limit position (top dead center) of the drive control device 23. It is set to be possible.

  The above-described contacts 41, 41, stripper bolts 42, and stepping springs 43 constitute the clamping means according to the present invention.

  On the other hand, as described above, the valve hole machining device 20 is provided with the drive control device 23 that moves up and down the upper die base 22 on which the upper die 29 is disposed along the vertical direction. The drive control device 23 is joined to the upper mold base 22 to move the upper mold base 22 up and down, a control device (not shown) for driving and controlling the hydraulic cylinder 45, and the upper mold And a linear scale 46 that detects the amount of movement of the table 22. Here, the control device for driving and controlling the hydraulic cylinder 45 includes a hydraulic servo mechanism for controlling the amount of oil to be sent to the hydraulic cylinder by controlling the rotation of the servo motor to control the operation of the hydraulic pump. The oil amount is controlled according to the detection signal from the linear scale 46. Thereby, the raising / lowering movement of the upper mold base 22 can be controlled with high accuracy.

Next, the valve hole opening process by the valve hole processing apparatus 20 described above will be described.
As shown in FIG. 3, the lower rim 25 and the rim support table 27 (see FIG. 2) of the wheel rim 2 are placed by a robot hand or the like (not shown) so that the portion where the valve hole 7 of the well portion 17a is formed on the die 26. ). On the other hand, the drive control device 23 is stopped at the upper drive limit position (hereinafter referred to as top dead center). Here, the air cylinder 37 for raising and lowering is configured such that the perforated punch 34 forms a seating process in which the processing surface 34 a is flush with the processing surface 32 a of the countersunk punch 32. At this time, the upper surface of the elevating member 40 is in contact with the stopper 49.

  As described above, when the wheel rim 2 is placed on the lower mold 25, the drive control device 23 is driven to lower the upper mold 29. Here, the drive control device 23 lowers the hole punch 34 and the presser punch 32 held in the seat processing mode to a pressing position where the mounting seat surface 8 having a predetermined planar shape can be formed in the well portion 17a. , Drive control.

  When the upper die 29 descends and comes closer to the wheel rim 2 than the above-described top dead center, first, the contacts 41 and 41 contact the outer peripheral surface of the well portion 17a of the wheel rim 2 as shown in FIG. Then, the treading pressure spring 43 is gradually contracted to generate treading pressure, and the contact elements 41 and 41 press the wheel rim 2. The wheel rim 2 is clamped and held by the contacts 41, 41 and the lower mold 25. Further, by descending, as shown in FIG. 4, the hole punch 34 and the seat pressing punch 32 held in the seat processing mode press the predetermined portion of the well portion 17a. When the perforated punch 34 and the countersunk punch 32 in the seat processing mode reach a predetermined pressing position so that the mounting seat surface 8 having a predetermined planar shape can be formed in the well portion 17a, the drive control device 23 is reached. Stops driving. Here, as described above, the drive control device 23 can be stopped at the pressing position with high accuracy, and the hole punch 34 is held in the seat processing mode by the stopper 49, so that the mounting seat surface 8 is accurately formed. can do. After that, when the punches 32 and 34 are separated from each other, the amount of pressure deformation due to the spring back action of the material is reduced. However, by setting the pressing position by predicting the amount of spring back in advance, It is possible to form a mounting seat surface 8 having a simple shape.

  In this way, the operation of lowering the perforated punch 34 and the presser punch 32 and pressing the well portion 17a of the wheel rim 2 to form the mounting seat surface 8 while maintaining the seat processing mode is performed according to the present invention. Is a pressing process operation, and is a first processing step.

  The drive control device 23 descends to the above-described pressing position and stops, and then lifts the hole punch 34 and the counterseat punch 32 and stops them away from the well portion 17a of the wheel rim 2. Then, as shown in FIG. 5, the lift air cylinder 37 is driven at the spaced apart position to lower the hole punch 34, and the hole is transformed into a hole machining mode protruding downward from the presser punch 32. Thereafter, the holding air cylinder 38 is driven to advance the holding member 39 into the movable air space 36b of the punch block 31, and the upper surface of the hole punch 34 is supported by the holding member 39, thereby holding the hole machining mode. . Here, the separation position that is lifted and stopped by the drive of the drive control device 23 is a position at which the hole punch 34 in the hole machining mode is separated from the mounting seat surface 8. In addition, when the upper die 29 is moved to the highest position by driving the drive control device 23, the contact positions 41, 41 that are in elastic contact with the well portion 17a of the wheel rim 2 generate the stepping pressure. It is a position that is maintained in the state. That is, this separated position is a position closer to the mounting seat surface 8 than the position where the contacts 41, 41 are initially contacted by the descending motion of the drive control device 23.

  As described above, the operation of moving the hole punch 34 and the counterseat punch 32 in the seat processing mode away from the wheel rim 2 from the pressing position and transforming from the seat processing mode to the hole processing mode is performed in the present invention. Such a retreat operation.

  As described above, after moving up to the separation position and transforming into the hole machining mode, the drive control device 23 is driven to lower the upper die 29 as shown in FIGS. By making it move, the perforated punch 34 is made in the central portion of the mounting seat surface 8 of the well portion 17a. Accordingly, the hole punch 34 penetrates the wheel rim 2 to form the valve hole 7. Here, the drive control device 23 performs control so that the pressing punch 32 held in the hole processing mode does not come into contact with the mounting seat surface 8 and descends to a hole opening position through which the hole punch 34 passes. In this manner, the operation of lowering the hole punching mode 34 in the hole processing mode from the separated position to form the valve hole 7 in the mounting seat surface 8 is the hole forming operation according to the present invention. The retreat operation and the hole drilling operation described above are the second machining process according to the present invention.

  Thereafter, the drive control device 23 is driven to raise the upper die 29. Accordingly, the hole punch 34 is separated from the valve hole 7 and gradually separated from the wheel rim 2. In accordance with this ascent, the stepping pressure generated in the contacts 41 and 41 gradually decreases, and then the contacts 41 and 41 are also separated from the wheel rim 2. Then, the drive control device 23 moves up to the top dead center and stops. Thereafter, the wheel rim 2 is removed from the lower mold 25 and the rim support table 27 by a robot hand or the like (not shown), and the processing step of the valve hole 7 to the wheel rim 2 is completed.

  In the process of machining the valve hole 7 in this way, the contacts 41, 41 arranged on the fixed base 30 generate a stepping pressure before starting the pressing process by the hole punch 34 and the seat punch 32. The wheel rim 2 is pressed from the outer peripheral side, and the wheel rim 2 is continuously supported by the stepping pressure while the above-described pressing processing operation, retraction operation, and hole opening processing operation are sequentially performed. Thus, the wheel rim 2 is fixed while the predetermined portion of the well portion 17a is positioned along the horizontal direction from the pressing process of the mounting seat surface 8 to the drilling process of the valve hole 7. Accordingly, the center of the mounting seat surface 8 and the valve hole 7 which are sequentially formed by the perforated punch 34 and the presser punch 32 moving up and down in the vertical direction can be exactly coincident with each other. Further, even when the machining process of the valve hole 7 is continuously performed as a production line, the mounting seat surface 8 and the valve hole 7 can be stably formed concentrically on the wheel rim 2. it can.

  Further, as described above, in the valve hole processing device 20 of the present invention, the presser punch 32 does not press the mounting seat surface 8 when the hole punch 34 is drilled (see FIGS. 6 and 8). For this reason, when the hole punch 34 is pulled out from the valve hole 7, the material of the hole edge of the valve hole 7 is prevented from flowing in accordance with the hole punch 34, and a relatively large burr that requires removal work is generated. Is preventing. Therefore, when the perforated punch 34 is detached from the valve hole 7, only a very fine burr is generated at the hole edge of the valve hole 7. The fine burrs are due to the clearance between the perforated punch 34 and the die 26, and have a size that does not need to be removed and are generated to some extent. Therefore, an operation step for removing the burrs is not required. .

  The valve hole machining apparatus 20 is mounted on the lower mold 25 so that the rim support table 27 can be tilted and moved up and down, and a predetermined portion of the well portion 17a forming the valve hole 7 is along the horizontal direction. Like to do. Accordingly, various wheel rims 2 having different inclination angles of the well portion 17a with respect to the wheel axis direction can be appropriately placed on the lower mold 25 by tilting the rim support table 27 according to the inclination angle. In addition, by making the rim support table 27 movable in the vertical direction and the front-rear direction, it is possible to easily and appropriately handle wheel rims 2 having different rim diameters.

  In addition, as described above, the valve hole machining apparatus 20 of the first embodiment can process and form the mounting seat surface 8 and the valve hole 7 with a single apparatus, and generates burrs that require removal work. Therefore, the production line and processing time can be shortened as compared with the conventional configuration described above. Thus, in the manufacturing process of the automobile wheel 1, the manufacturing cost can be reduced.

  As shown in FIG. 9, the valve hole machining apparatus 50 according to the second embodiment includes an upper mold 53 provided with a hole punch 64 and a countersunk punch 62 on an upper mold base 52 that is moved up and down by a drive control device 23, and the hole. A hydraulic cylinder 60 that moves the open punch 64 up and down along the vertical direction is disposed. That is, the upper mold 53 and the hydraulic cylinder 60 can be moved up and down integrally by the drive control device 23. Further, the operating direction of the hydraulic cylinder 45 of the drive control device 23 and the operating direction of the hydraulic cylinder 60 are both the same vertical direction. The upper mold 53 is attached to the lower surface of the upper mold base 52, and the hydraulic cylinder 60 is disposed on the upper mold base 52. The hydraulic cylinder 60 constitutes a punch punch driving control unit according to the present invention.

  Here, the upper die 53 includes a punch block 54 having a ring-shaped counter punch 62 projecting downward, and a punch punch 64 inserted through a guide hole 33 provided in the central portion of the counter press punch 62. Prepare. Here, the guide hole 33 is provided along the vertical direction so as to be concentric with the presser punch 62 as in the first embodiment described above, and a punch punch 64 inserted through the guide hole 33 is provided. These are arranged concentrically with the presser punch 62. Further, the perforated punch 64 is connected to the above-described hydraulic cylinder 60 via a connecting member 61, and the punching block 54 is provided with a working chamber in which the connecting member 61 can be moved in the vertical direction. 55 is provided. In other words, the perforated punch 64 moves in the vertical direction as the hydraulic cylinder 60 is driven.

  Further, even in the upper mold 53, as in the first embodiment described above, the contacts 41, 41 that support the well portion 17a of the wheel rim 2 are formed by the stripper bolts 42, 42 and the stepping springs 43, 43. It is suspended by the punch block 54. As described above, the contact 41 is moved integrally with the punch block 54 by the drive control device 23, and comes into contact with the well portion 17 a when the punch block 54 comes close to the wheel rim 2. The spring 43 is elastically contracted to generate a stepping pressure that presses the well portion 17a.

  The hydraulic cylinder 60 described above reciprocates between a top dead center position and a bottom dead center position by driving along the vertical direction. As a result, the punched punch 64 connected through the connecting member 61 at the top dead position has the processed surface 64a flush with the processed surface 62a of the countersunk punch 62 (see FIG. 10), and reaches the bottom dead position. By driving, the perforated punch 64 is lowered and protruded from the presser punch 62 (see FIG. 13). Here, the hole punch 64 defines the load capacity of the hydraulic cylinder 60 so that the wheel rim 2 can be pierced by its descending motion. The hydraulic cylinder 60 can hold the perforated punch 64 at a top dead position where the presser punch 62 and the processing surfaces 62a and 64a are flush with each other. This is the seat processing mode according to the present invention. is there. Moreover, the operation | movement hold | maintained in this seat processing aspect is the seat processing holding operation | movement of this invention.

  The hydraulic cylinder 60 is driven and controlled by a control device (not shown) including a pump (not shown) that feeds oil to the cylinder. This punching punch control means is constituted.

  On the other hand, in the valve hole machining device 50, the drive control device 23 includes a hydraulic cylinder 45, a control device (not shown) having a hydraulic servo mechanism, a linear scale 46, and the like, as in the first embodiment. It is composed of The apparatus 50 is also provided with a lower mold base 21, a lower mold 25, a rim support table 27, and the like. Thus, in the apparatus 50 of the second embodiment, the description of the same configuration as that of the first embodiment described above is omitted.

Next, the valve hole opening process by the valve hole processing apparatus 50 described above will be described.
As shown in FIG. 10, the hole rim 2 is placed on the lower die 25 and the rim support table 27 by a robot hand or the like (not shown) so that the portion where the valve hole 7 of the well portion 17a is formed on the die 26. . On the other hand, the drive control device 23 is stopped at its top dead center, and the hydraulic cylinder 60 holds the perforated punch 64 and the countersunk punch 62 in a seating manner in which both the machining surfaces 64a and 62a are flush with each other. is doing.

  And the drive control apparatus 23 is driven and the upper mold | type 53 and the hydraulic cylinder 60 are moved down integrally. At this time, the hydraulic cylinder 60 is not driven, and the above-described seat machining mode is maintained. When the upper die 53 is moved down by the drive of the drive control device 23 and the punch block 54 comes close to the wheel rim 2, first, the contacts 41, 41 come into contact with the outer peripheral surface of the well portion 17 a of the wheel rim 2, The spring 43 gradually contracts to generate a stepping pressure, and the contacts 41, 41 press the wheel rim 2. The wheel rim 2 is clamped and held by the contacts 41, 41 and the lower mold 25. By further descending, as shown in FIG. 11, the perforated punch 64 and the presser punch 62 held in the seat processing mode press the well portion 17a. And it stops at the press position which forms the attachment seat surface 8 of a predetermined plane shape in the well part 17a. Thus, the mounting seat surface 8 is accurately formed at a predetermined portion of the well portion 17a. The operation of forming the mounting seat surface 8 by the hole punch 64 and the counterseat punch 62 held in this seat processing mode is the press processing operation according to the present invention and is the first processing step.

  As described above, when the mounting seat surface 8 is formed by descending to the pressing position, the drive control device 23 moves up the hole punch 64 and the seat pressing punch 62, and the wheel rim 2 as shown in FIG. This is stopped after being separated from the well portion 17a. The punch block 54 (seat pressing punch 62) is held at the separated position. Here, the separated position is a position where the contacts 41 and 41 are maintained in a state where the contact pressure is generated, and the distance from the above-described pressing position is determined by the stroke amount (top dead) of the hydraulic cylinder 60. The distance from the position to the bottom dead position) is set to be shorter. Thus, the operation | movement which raises the punch punch 64 of the seat processing aspect and the counterseat punch 62 from a press position to a separation position, and hold | maintains the press punch 62 in this separation position is a retraction operation | movement concerning this invention.

  After the drive control device 23 stops driving at the above-described separated position and holds the press punch 62, the hydraulic cylinder 60 is driven to lower the hole punch 64, as shown in FIG. The central part of the mounting seat surface 8 is drilled. Thereby, the perforated punch 64 penetrates the wheel rim 2 and forms the valve hole 7. At this time, the presser punch 62 is held in the separated position and is not in contact with the wheel rim 2. Thus, the operation of driving the hydraulic cylinder 60 and forming the valve hole 7 in the mounting seat surface 8 by the hole punch 64 is the hole drilling operation according to the present invention. The retreat operation and the hole drilling operation described above are the second machining process according to the present invention.

  Then, the hydraulic cylinder 60 is driven to disengage the perforated punch 64 from the wheel rim 2 and return the perforated punch 64 to a top dead position where the perforated punch 64 is flush with the presser punch 62. Thereafter, the drive control device 23 is driven to raise the upper mold 53 and gradually move away from the wheel rim 2. In accordance with this ascent, the stepping pressure generated in the contacts 41 and 41 gradually decreases, and then the contacts 41 and 41 are also separated from the wheel rim 2. Then, the drive control device 23 moves up to the initial top dead center and stops. Then, the wheel rim 2 is removed from the lower mold 25 and the rim support table 27 by a robot hand or the like (not shown), and the processing step of the valve hole 7 to the wheel rim 2 is completed. Here, when the hole punch 64 is detached from the valve hole 7, a relatively large burr that needs to be removed does not occur at the hole edge of the valve hole 7, as in the first embodiment described above. No deburring process is required.

  As described above, in the valve hole machining apparatus 50 according to the second embodiment, the hydraulic cylinder 60 is driven to perform a hole drilling operation in which the wheel rim 2 is drilled with the hole punch 64. The mounting seat surface 8 and the valve hole 7 are formed in substantially the same manner as in Example 1 described above except that the opening process operation is different. Therefore, the same working effects as those of the first embodiment described above can also be exhibited by the processing apparatus 50.

  On the other hand, in the configuration of the first embodiment and the second embodiment described above, the drive control device 23 includes a hydraulic servo mechanism, but a servo press can also be used. Since this servo press can also control the movement of the perforated punches 34 and 64 and the presser punches 32 and 62 with relatively high accuracy, it can be suitably used in the present invention, and properly exhibits the above-described effects. It can be done.

  Further, in the first embodiment, the retraction operation is controlled to drive the elevating air cylinder 37 so as to transform the upper mold 29 from the seat machining mode to the hole machining mode in synchronization with the ascending movement of the upper mold 29 to the separation position. It can also be done. Thereby, it is possible to further reduce the time required for the valve hole processing. On the other hand, in the first embodiment, the lifting air cylinder 37 moves up and down the perforated punch 34, but the perforated punch may be fixed to the upper mold and the pressing punch may be moved up and down.

  In the first and second embodiments, the presser punches 32 and 62 and the perforated punches 34 and 64 are concentric so that the mounting seat surface 8 and the valve hole 7 are formed concentrically. The positional relationship between the mounting seat surface and the valve hole can be changed by changing the positional relationship between the presser punch and the hole punch. This is because the mounting seat surface and the valve hole can be formed with high accuracy according to the present invention in accordance with the positional relationship between the press punch and the hole punch.

Furthermore, in the above-described first and second embodiments, the perforated punch 34 and the countersunk punch 32 have a configuration in which a seat processing mode in which the processing surfaces 34a and 32a are flush with each other is formed. However, the perforated punch 34 can also be configured to have a seat machining mode in which the machining surface 34a is retracted above the machining surface 32a of the presser punch 32. Even with this configuration, the mounting seat surface 8 and the valve hole 7 can be accurately formed in the same manner as described above, and a large burr that requires a deburring operation does not occur. Therefore, the same operational effects as those of the first and second embodiments described above can be exhibited. In this case, the perforated punch 34 can be suitably used such that its processing surface 34 a is slightly retracted from the processing surface 32 a of the countersunk punch 32.

Claims (4)

In a valve hole machining method for an automobile wheel rim, in which a valve hole for mounting an air valve on a predetermined part of the wheel rim is molded,
An annular punch that presses the mounting seating surface of the air valve, and a punch that is inserted into the guide hole formed in the presser punch to drill the valve hole. On the other hand, after holding in the seat processing mode that does not protrude, the first processing step of forming the mounting seat surface by pressing the wheel rim while maintaining the seat processing mode,
A second machining step of forming a valve hole by separating the countersunk punch and the punched hole from the wheel rim and then forming the valved punch in the wheel rim so as not to contact the mounting seating surface; Are executed sequentially, and
An automobile characterized in that the wheel rim is firmly held from the first machining step to the second machining step by a clamping means for supporting the wheel rim from the machining side and a rim support means for supporting the wheel rim from the machining back side. Of wheel hole for wheel rim. In a vehicle wheel rim valve hole machining apparatus for molding a valve hole for mounting an air valve on a predetermined part of a wheel rim,
An annular seat pressing punch in which a guide hole is formed along the moving direction for pressing the mounting seat surface of the air valve,
A hole punch for punching a valve hole, which is movably inserted in a guide hole provided in a countersunk punch,
The perforated punch and the countersunk punch are transformed into a seating mode in which the perforated punch does not protrude with respect to the countersunk punch and a hole processing mode in which the perforated punch projects from the countersunk punch. Punch transformation holding means to hold in,
Pressing the press punch held in the seat processing mode on the wheel rim to form a mounting seat surface, and the retraction holding the press punch and hole punch away from the wheel rim and holding in the hole processing mode Driving control means for sequentially executing the operation and the hole punching operation for forming the valve hole by punching the wheel rim in the wheel rim so as not to contact the mounting seat surface while maintaining the hole processing mode When,
Clamping means for supporting the wheel rim from the machining side from the start of the pressing process operation by the drive control means to the end of the drilling process operation,
A wheel hole for a vehicle wheel rim, characterized in that it is provided with a die that abuts against the back surface of a predetermined portion of the wheel rim that forms a mounting seat surface, and includes rim support means for supporting the wheel rim from the back side. Processing equipment. In a vehicle wheel rim valve hole machining apparatus for molding a valve hole for mounting an air valve on a predetermined part of a wheel rim,
An annular seat pressing punch in which a guide hole is formed along the moving direction for pressing the mounting seat surface of the air valve,
A hole punch for punching a valve hole, which is movably inserted in a guide hole provided in a countersunk punch,
Seat processing holding operation to hold the punch in a seat processing mode that does not protrude with respect to the press punch, and punch processing to make a valve hole in the wheel rim by projecting the punch from the press punch Punch punch drive control means for executing
While maintaining the seat processing mode by the seat processing holding operation of the punch punch drive control means, the press processing operation for pressing the counter press punch to the wheel rim, and separating the press punch and the punch punch from the wheel rim, Drive control means for holding the countersunk punch in the separated position and sequentially executing a retreat operation in which a hole punching operation is executed by the hole punch drive control means;
Clamping means for supporting the wheel rim from the processing side from the start of the pressing processing operation to the end of the drilling processing operation,
A wheel hole for a vehicle wheel rim, characterized in that it is provided with a die that abuts against the back surface of a predetermined portion of the wheel rim that forms a mounting seat surface, and includes rim support means for supporting the wheel rim from the back side. Processing equipment. The clamp means is provided so as to be movable integrally with the presser punch by driving of the drive control means,
A contact that elastically contacts the processing side surface of the wheel rim, and a biasing means that biases the contact in the moving direction. 4. The contactor according to claim 2 or 3, wherein the contact piece is configured to elastically contact with the processing side surface of the wheel rim by generating a stepping pressure between the spaced position where the presser punch is separated from the wheel rim. Valve hole machining equipment for automobile wheel rims.

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