JP4917001B2 - Manufacturing method of front axle beam - Google Patents

Description

  The present invention relates to a method for manufacturing a front axle beam included in a front rigid axle suspension of a vehicle.

  A rigid axle suspension, abbreviated as “rigid axle”, is known as a vehicle suspension device. For example, as disclosed in Patent Document 1, a front rigid axle suspension for a front wheel of a vehicle includes a front axle beam extending in the vehicle width direction and both longitudinal ends of the axle beam in trucks, buses, off-road vehicles, and the like. It consists of a combination of leaf springs fixed to the left and right spring seats of the part (both ends in the vehicle width direction when mounted in the vehicle).

  More specifically, the front axle beam has a U-shape in front view bent upward from both ends of the beam body extending in the vehicle width direction, and a pair of left and right spring seats are formed on the upper surface of the end portion of the beam body. Has been. The leaf spring is fixed to the front axle beam while being seated on the upper surface of the spring seat.

JP 07-215004 A

  The beam body of the front axle beam has an I-shaped cross section having an upper flange and a lower flange extending horizontally in the upper end and lower end of the upright wall, respectively. When it is necessary to form a through hole (hereinafter referred to as a “lateral through hole”) for some purpose in the upright wall of the beam body (for example, a light weight hole), the front axle beam is in a horizontal state, that is, the beam body is upright. It is common to position the front axle beam so that the wall is horizontal, and then use the vertical press movement of the press device as it is, and use the method of penetrating the upright wall in the horizontal orientation with a punch vertically it is conceivable that.

  However, the above concept is based on the idea of using a press device as a dedicated machine for forming a through hole. This is because when the front axle beam immediately after molding is hot and some processing is performed on the front axle beam using the press device, installing a press device for each processing increases the equipment cost. It is not preferable.

  The objective of this invention is providing the manufacturing method of the front axle beam which can provide the function which forms a horizontal through-hole additionally to a press apparatus.

The above technical problem is in the present invention.
A method for manufacturing a front axle beam having a beam body extending in a vehicle width direction,
A slider driving body fixed to an upper mold side structure that performs a pressing operation by a downward movement and having an inclined driving surface;
A clamper mechanism that is provided in the stationary lower mold side structure and positions the front axle beam in a hot state formed by forging or casting in a state in which the front axle beam is mounted on the vehicle;
A driven slider provided on the lower mold side structure and laterally approaching the front axle beam positioned by the clamper mechanism, the driven slider being spaced apart from the front axle beam, wherein the tilt of the slider drive body A driven slider having an inclined receiving surface complementary to the driving surface;
A punch provided on the driven slider and extending toward the beam body of the front axle beam;
A pressing device including slider driving means for retracting the driven slider in a direction away from the front axle beam;
A molding process for producing a front axle beam molding by forging or casting;
A deburring step of deburring from the front axle beam in a hot state immediately after the forming step;
A positioning step of positioning the front axle beam in a state in which the axle beam in the hot state immediately after the deburring step is mounted on a vehicle by the clamper mechanism of the press device;
A through hole forming step of forming a through hole in the beam body,
In the through hole forming step, the slider driving body is moved downward by causing the pressing device to perform a pressing operation, and the follower is driven by the cooperation of the inclined driving surface of the slider driving body and the inclined receiving surface of the driven slider. After driving the slider laterally and in a direction approaching the front axle beam, a lateral through hole is formed in the beam body by the punch of the driven slider, and then the upper mold side structure is raised This is achieved by providing a method of manufacturing a front axle beam, which comprises retracting the driven slider in a direction away from the front axle beam by the slider driving means.

  That is, according to the present invention, the lateral movement of the driven slider provided with the inclined receiving surface complementary to the inclined driving surface of the slider driving body provided in the upper mold side structure is performed in the pressing operation of the pressing device, that is, the downward operation. The horizontal through hole can be formed in the front axle beam positioned in a state of being mounted on the vehicle by the punch of the driven slider. The above-described structure for forming the horizontal through hole may be incorporated into the press device, and the press device may be used as a dedicated machine for forming the horizontal through hole. You may make it carry out with the press apparatus incorporating this structure. Typically, other processes include a right and left seat pushing process of the front axle beam.

  In the description of the seat pushing process, when the front axle beam is a forged product or a cast product, there is a die cutting gradient on the upper surface and the lower surface of the front axle beam in order to perform die cutting from the molding die. A press device is used to remove the draft included in the plate and form it into a flat spring seat. The process of press-molding the spring seat with the press device is called “seat pressing process”. Conventionally, this seat-pressing process is performed on a hot axle beam molded product immediately after the front axle beam molded product is taken out of the mold and then deburred.

  By performing the horizontal through-hole forming process and the seat-pressing process with a single press device, not only can the equipment cost be reduced compared to the case where a dedicated machine is installed for each process, but also between multiple press devices. Thus, it is not necessary to carry out the steps of transporting the front axle beam W or positioning the front axle beam W in each press device, and it is possible to prevent the front axle beam W from being cooled during that time.

  That is, in order to perform the pressing process using the press device, the front axle beam W is positioned in a state where it is mounted on the vehicle, and the upper surface of the spring seat facing upward is press-molded with the pressing mold. In this positioning state, it is possible to perform the process of forming the horizontal through hole.

  If the press machine has insufficient ability to press-mold the left and right spring seats by a single press operation, press-form one spring seat first and then press-mold the other spring seat. It is good to do. For this purpose, left and right seating dies that can move independently from each other are provided on the upper mold side structure of the press device, and when one of the seating dies is set in the operating position, Retreat to position. In this way, by preparing the right and left seating dies that can be moved independently, when performing the horizontal through hole forming process described above, both the left and right seating dies are retracted to the non-operating position, thereby causing the lateral penetration. The pressing operation for the hole forming process can be invalidated with respect to the left and right seat pressing processes.

  The above and other objects of the present invention and the effects thereof will become apparent from the following detailed description of the preferred embodiments of the present invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 shows an outline of a press apparatus. The illustrated press apparatus includes a horizontal hole forming process for forming a horizontal through hole in a beam body of a front axle beam W, and a seat pressing process for forming spring seats positioned at both ends of the beam main body. Used for. A lower mold side structure included in the pressing apparatus of FIG. 1 is shown in FIG. 2, and an upper mold side structure is shown in FIG.

  As shown in FIG. 2, the lower mold side structure 100 placed in the pressing apparatus 1 has a lower mold base plate 104 placed on the lower bolster body 102, and a clamper 106 is arranged on the lower mold base plate 104. It is installed. The front axle beam W in the hot state is sandwiched by the clamper 106 from both sides thereof, and is thereby positioned on the lower mold base plate 104.

  The illustrated front axle beam W is a molded product by forging in this embodiment, but may be a cast product. This front axle beam W is set in the press device 1 immediately after the deburring process after molding, and a horizontal hole forming process is performed on the front axle beam W in a hot state by a series of operations of the press device 1 thereafter. And a seat-pressing process.

  In the embodiment, the front axle beam W is first subjected to the seat pressing process, and then the horizontal hole forming process is performed. However, the present invention is not limited to this. First, the horizontal hole forming process is performed, and then the seat pressing process is performed. May be performed.

  Before describing the above two processes in the press apparatus 1, an outline of the front axle beam W will be described with reference to FIG. The front axle beam W has a beam main body 11 that extends linearly in the vehicle width direction, and the cross-sectional shape of the beam main body 11 includes an upper flange 11b and a lower flange 11c that extend laterally at the upper and lower ends of an upright wall 11a. I shape (FIG. 4).

  Spring seats 10 are provided on the upper surfaces of both ends of the front axle beam W, that is, the left and right ends of the beam body 11, and leaf springs (not shown) are placed on the spring seats 10. In this state, the leaf spring is fixed to the front axle beam W. In order to identify the left and right spring seats 10, “L” is added to the left side spring seats when the front axle beam W mounted on the vehicle is viewed from the front. "R" is added to the spring seat located at.

  As can be seen from FIG. 2, the front axle beam W includes left and right standing end portions 12 extending upward from both ends of the beam body 11, so that the front axle beam W is generally U-shaped when viewed from the front. It has the shape of And the bearing hole 13 extended up and down is formed in the outer end of the right-and-left standing end part 12, respectively, A front wheel (not shown) is assembled | attached so that steering is possible using this bearing hole 13. As shown in FIG. Since the structure of such a front axle beam W is conventionally known, detailed description thereof is omitted.

  There is a gradient on the upper and lower surfaces of the front axle beam W immediately after molding so as to punch the front axle beam W from the molding die, and the upper surface of the spring seat 10 including this die cutting gradient is the seat by the press device 1. It is formed flat by pressing.

  Further, through holes are formed in the upright wall 11a of the beam body 11 of the front axle beam W by the above-described lateral hole forming process. This through hole may be a hole for the purpose of reducing the weight of the front axle beam W, or may be a bolt insertion hole for fixing any member, and the purpose and shape of the through hole are arbitrary. is there.

  With reference to FIG. 2, the clamper mechanism 106 clamps the pair of left and right first clampers 106 a and 106 a that clamp the upper end of the standing end 12 of the front axle beam W, and the longitudinal central portion of the beam body 11. The second clamper 106 b and a pair of left and right third clampers 106 c and 106 c that clamp the left and right spring seats 10 of the beam body 11 are configured. The first clamper 106 a is installed on the lower base plate 104. And installed on the upper part of the cradle 108 extending upward. The hot front axle beam W, which is a workpiece, is inserted into a workpiece accommodating space formed by opening all the clamper mechanisms 106 in a state where the front axle beam W is mounted on the vehicle, that is, with the spring seat 10 facing upward. The front axle beam W is positioned by gripping both sides thereof by the clamping operation of the clamper mechanism 106.

  The lower bolster body 102 is positioned on the side of the beam body 11 of the front axle beam W positioned by the clamper mechanism 106, and can be separated and moved in a direction perpendicular to the front axle beam W. A guide groove (not shown) for guiding the driven slider 120 is further provided. The driven slider 120 has a punch 122 protruding toward the beam body 11, and the shape of the punch 122 is set according to the purpose of the through hole formed in the beam body 11. In this embodiment, the through hole formed in the beam body 11 is intended to reduce the weight of the front axle beam W. For example, three punches 122 having a rectangular cross section are provided in the lateral direction. However, the present invention is not limited to this.

  The upper surface of the driven slider 120 is composed of an inclined receiving surface 124 and has a vertical surface 126 on the front axle beam W side. The driven slider 120 is forcibly driven to a position away from the front axle beam W by a horizontal hole air cylinder 128 as a slider driving means, and is set at a preparation position. The role of the inclined receiving surface 124 of the driven slider 120 and the operation of the driven slider 120 and the side hole air cylinder 128 will be described later.

  FIG. 3 which shows the upper mold | type structure 200 which press-acts by a downward movement is shown in the state upside down. With reference to FIG. 3, the upper mold side structure 200 includes an upper mold base plate 204 installed on the upper bolster body 202, and a pair of left and right seat pressing molds 206 of the upper base plate 204 are installed. In order to identify the left and right seat pressing dies 206, “L” is added to the left seat pressing die, and “R” is added to the seat pressing die located on the right side. A pair of left and right parallel guide grooves 208L and 208R are formed in the upper base plate 204 in relation to the left and right seat pressing dies 206L and 206R. The parallel guide grooves 208L and 208R extend in a direction orthogonal to the arrangement direction of the left and right seat pressing dies 206L and 206R. The left and right seat pressing dies 206L and 206R can be moved back and forth while being guided by a corresponding pair of left and right parallel guide grooves 208L and 208R.

  The upper mold-side structure 200 is also composed of a central pressing mold 210 positioned between the left seat pressing mold 206L and the right seat pressing mold 206R, and left and right seat pressing molds 206L and 206R. The center pressing mold 210 and the left and right end pressing molds 212L and 212R are fixed to the upper mold base plate 204.

  The left and right seat pressing dies 206L and 206R are located corresponding to the left and right spring seats 10L and 10R of the front axle beam W positioned on the lower die base plate 104, respectively. The center presser mold 210 is positioned corresponding to the central portion in the longitudinal direction of the upper flange 11b of the front axle beam W. The pair of left and right end holding molds 212L and 212R are positioned corresponding to the bearing holes 13L and 13R at the left and right ends of the front axle beam W, respectively.

  Reference numerals 214L and 214R shown in FIG. 3 are left and right seat-push type air cylinders as seat-push type drive means, and a pair of left and right seat-push type air cylinders 214L and 214R are used as a pair of left and right seat-push type air cylinders. The pressing dies 206L and 206R can be guided and moved by the parallel guide grooves 208L and 208R independently of each other, and each of the pressing dies 206L (206R) is individually moved to each spring seat 10L (10R). ) And an inoperative position away from each spring seat 10L (10R).

  Reference numeral 110 shown in FIG. 2 is a guide post, and a pair of guide posts 110 standing upright from the lower bolster body 102 are received by guide bushes 216 provided on the upper bolster body 202, whereby the upper bolster body 202 is Guided by the guide post 110, it can move up and down.

  In the upper mold side structure 200, a slider driver 220 is fixed to the upper bolster body 202 between the left and right guide bushes 216. The slider driving body 220 has an inclined driving surface 222 complementary to the inclined receiving surface 124 of the driven slider 120 described above, and an opposing vertical surface 224 on the side facing the vertical surface 126 of the driven slider 120. Have

  When the seat-pressing process is performed, the driven slider 120 is retracted to a non-operating position where it does not interfere with the slider driver 220. The retreating operation of the driven slider 120 is performed by the side hole air cylinder 128 being shortened. On the other hand, when performing the horizontal hole forming process, as a preparatory step, the horizontal hole air cylinder 128 is positioned at a standby position where it interferes with the slider driver 220 by extending.

Seat pressing :
A seat pressing process for forming the upper surface of the spring seat 10 flat using the press device 1 described above will be described below. The left and right spring seats 10L and 10R of the front axle beam W formed by forging have a draft angle for releasing the front axle beam W from the mold, and the spring seat 10 having the draft angle is a press. The device 1 is formed into a flat surface.

  The front axle beam W taken out from the molding die is deburred immediately after molding. Next, the upper surface of the left and right spring seats 10 </ b> L and 10 </ b> R is press-formed by the press device 1 in the hot front axle beam W.

  FIG. 2 shows a process of setting the deburred front axle beam W in the press device 1. The press apparatus 1 stands by with all the clamper mechanisms 106 opened, and the front axle beam W is inserted into the workpiece accommodating space of the opened clamper mechanism 106.

  When the front axle beam W is set in the clamper mechanism 106, all the clamper mechanisms 106 operate to clamp the front axle beam W. That is, the front axle beam W is clamped from both sides by the first to third clampers 106 a to 106 c, whereby the front axle beam W is positioned on the lower mold base plate 104. The positioned front axle beam W is in a state in which the upper surfaces of the pair of left and right spring seats 10L and 10R at both ends of the beam body 11 face upward as in the state of being mounted on the vehicle.

  When the clamping operation of the clamper mechanism 106 is completed, the spacer 114 is inserted into the gap formed between the inclined plate 112 and the second and third clampers 106b and 106c (FIG. 5), whereby the second and third The clampers 106b and 106c are fixed in a clamped state.

  In addition to the positioning of the front axle beam W described above, when using the press device 1 that is insufficient in ability to press-mold the left and right spring seats 10L, 10R by one press operation, the upper mold side structure In 200, the left and right seat pressing dies cylinders 214L and 214R operate to set one of the left and right seat pressing dies 206L and 206R to the operating position, and the other to the non-operating position. In the illustrated example, the left seat pressing die 206L is set to the operating position, and the right seat pressing die 206R is set to the non-operating position. Further, the driven slider 120 is retracted to a non-operating position where it does not interfere with the slider driver 220.

First press operation :
In the press apparatus 1, the upper mold side structure 200 is lowered to perform the first press operation. FIG. 6 is a diagram for explaining the first press operation. As can be seen from FIG. 6, the upper surface of the left spring seat 10L of the front axle beam W is press-molded by the left seat pressing die 206L set in the operating position, and when the left spring seat 10L is press-molded. The center portion of the front axle beam W (beam body 11) is pressed by a center portion pressing mold 210, and the upper end surfaces of the left and right standing end portions 12L and 12R of the front axle beam W (beam body 11) are end pressing portions. It is pressed by the molds 212L and 212R.

  In other words, since the right seat pressing die 206R is in the non-actuated position in the first press operation, the first press operation is ineffective for the right spring seat 10R. When the pressing of the left spring seat 10L is completed by the first press operation, the upper die side structure 200 is raised, and then the left and right seat pressing die cylinders 214L and 214R are operated. The left seat pressing die 206L in the operating position is moved to the non-operating position, and conversely, the right seat pressing die 206R is set in the operating position.

Second press operation :
Next, the upper mold side structure 200 is lowered to perform the second press operation. FIG. 7 is a diagram for explaining the second press operation. The upper surface of the right spring seat 10R of the front axle beam W is press-molded by the right seat pressing die 206R set at the operating position. During the press molding of the right spring seat 10R, the center portion of the front axle beam W (beam body 11) is pressed by the center portion presser mold 210, and the front axle beam W (beam body 11) rises left and right. The upper end surfaces of the end portions 12L and 12R are pressed by the end pressing molds 212L and 212R.

  In other words, in the second press operation, the left presser die 206L is in the non-actuated position, so this second press operation is ineffective for the left spring seat 10L. When the press forming of the right spring seat 10R is completed by the second press operation in the seat pressing process, the upper die side structure 200 is raised, and the right seat pressing die 206R set at the operating position is moved to the non-operating position. Retreated to.

  As can be seen from the above description, according to the seat-pressing process in the embodiment, one spring seat 10L (with one press operation) is applied to the front axle beam W having the pair of left and right spring seats 10L, 10R. 10R) and press forming of the left and right spring seats 10L and 10R of the front axle beam W is completed by a total of two press operations.

  Therefore, even if the left and right spring seats 10L, 10R of the front axle beam W are relatively small press apparatus 1 that has insufficient ability to simultaneously mold by one press operation, the seat pressing process of the embodiment is used. Therefore, if each spring seat 10L (10R) has an ability to press-mold individually, the pressing operation for the spring seats 10L and 10R of the front axle beam W is performed by executing the pressing operation twice. It can be carried out. Example when a press device having a press capacity of 1,300 to 1,500 tons is required to simultaneously form the left and right spring seats 10L, 10R of the front axle beam W by a single press operation as in the prior art. According to the seat pressing process, the left and right spring seats 10L, 10R of the front axle beam W can be press-formed even with a pressing device having a pressing capability of about half of 700 tons.

  Further, when the spring seats 10L (10R) are individually press-molded, the central portion located between the left and right spring seats 10L, 10R of the beam body 11 is pressed by the center presser mold 210. It is possible to prevent the front axle beam W from being deformed when (10R) is press-molded.

  When the press device 1 has the ability to press-mold the left and right spring seats 10L, 10R by a single press operation, the left and right seat press dies 206L, 206R are both set to the operating position and the press operation is performed. Needless to say.

Horizontal hole formation processing :
10-12 is a figure for demonstrating a series of operation | movement of a horizontal hole formation process. As described above, in the seat pressing process, the driven slider 120 is positioned at the non-actuated position (the position (I) shown in FIG. 8). Therefore, when the seat pressing process is completed, the left and right seat pressing molds 206L and 206R are completed. Is retracted to the non-operating position, and the driven slider 120 is set from the non-operating position (position (I) in FIG. 8) to the standby position (position (II) in FIG. 8) by the extension operation of the air cylinder 128 for the horizontal hole. The

  The non-operating position (I) is a position where the driven slider 120 does not interfere with the slider drive body 220 when the slider drive body 220 moves downward from the front axle beam W. The standby position (II) is a position where the inclined driving surface 222 of the slider driving body 220 that moves downward can be received by the inclined receiving surface 124 of the driven slider 120.

  As described above, in the press device 1, the left and right seat pressing dies 206L and 206R are set at the non-operation position, and the driven slider 120 acts on the inclined drive surface 222 of the slider drive body 220 that moves downward. It is set at a standby position where it can be received (position (II) in FIG. 8). Accordingly, when the slider drive body 220 is moved downward by the press operation (third press operation) of the press device 1 and the inclined drive surface 222 of the slider drive body 220 comes into contact with the inclined receiving surface 124 of the driven slider 120. The third press operation is converted into a lateral operation of the driven slider 120 by the cooperative action of the inclined driving surface 222 of the slider driving body 220 and the inclined receiving surface 124 of the driven slider 120. 120 advances in the lateral direction to form a lateral through hole in the front axle beam W (FIG. 9). When the driven slider 120 moves forward to form a horizontal through hole in the front axle beam W, the horizontal hole air cylinder 128 is set to a free state. The third press operation is invalid for the left and right spring seats 10L, 10R of the front axle beam W.

  The lateral movement of the driven slider 120 causes the driven slider 120 to approach the front axle beam W, and eventually the punch 122 of the driven slider 120 passes through the upright wall 11a of the beam body 11 (position (III) in FIG. 9). The horizontal through hole 20 is formed in the upright wall 11a (FIG. 10).

  When the press operation for forming the horizontal through hole 20 is completed and the slider drive body 220 is raised to the original position, the horizontal hole air cylinder 128 starts the shortening operation, and the driven slider 120 is in the original position. Retreat to position (I).

  FIG. 11 shows a state where the third press operation of the press apparatus 1 has started. As can be seen from FIG. 11, even in the third press operation, the center portion of the front axle beam W is pressed by the center presser mold 210. That is, when the lateral through hole 20 is formed with respect to the front axle beam W positioned to be mounted on the vehicle, the central portion of the beam body 11 is pressed by the central pressing die 210. As described above, when the press device 1 performs the third press operation in order to form the horizontal through hole in the front axle beam W, the horizontal hole air cylinder 128 is set to a free state, and the horizontal hole is generated by an external force. The air cylinder 128 can be freely extended.

  FIG. 12 is a view corresponding to FIG. 9 and shows a state in which the punch 122 is stuck into the front axle beam W from the lateral direction. FIG. 13 shows a state in which the third press operation is completed, and then the slider driver 220 returns to the original position. FIG. 14 is a view corresponding to FIG. 10 and shows a state in which the driven slider 120 is returned to the original position, that is, the non-operating position by the shortening operation of the air cylinder 128 for the side hole.

  The spacer 114 is then removed. After that, all the clamper mechanisms 106 are opened to release the front axle beam W, and then the front axle beam W is taken out from the press device 1 (FIG. 15).

  The front axle beam W positioned in a state of being mounted on the vehicle by a series of three press operations of the relatively small press device 1 performs a seat pressing process for the left and right spring seats 10 and a penetration for the upright wall 11a. Hole formation, that is, horizontal hole formation processing can be performed.

  In other words, in addition to the pressing device for pressing the spring seat 10 of the front axle beam W, there is no need to prepare an additional pressing device for forming a lateral through hole in the front axle beam W. The table pressing device 1 can perform a seat pressing process and a horizontal hole forming process. In other words, if the seat pressing process and the horizontal hole forming process are performed by different pressing devices, the front axle beam W is positioned when the seat pressing process is performed, and then the front axle beam W is transported to the next pressing device. In addition, a step of positioning the front axle beam W is required.

  Of course, it is possible to omit the elements for the seat-pressing process from the press apparatus 1 of the embodiment and to make a dedicated press apparatus that performs only the horizontal hole forming process on the front axle beam W.

It is an external view of the press apparatus applicable to this invention. It is a figure for demonstrating the structure of the lower mold | type side of the press apparatus of FIG. It is a figure for demonstrating the structure of the upper mold | type side of the press apparatus of FIG. It is a figure for demonstrating the cross-sectional shape of the front axle beam of a workpiece | work, and is sectional drawing along the IV-IV line of FIG. It is a figure for demonstrating the state by which the front axle beam of the hot state was clamped by the clamper mechanism contained in the lower mold | type structure of the press apparatus of FIG. It is a figure for demonstrating the process of shape | molding one spring seat by the 1st press operation | movement. It is a figure for demonstrating the process of shape | molding the other spring seat by the 2nd press operation. It is a figure for demonstrating the preparatory process for forming a horizontal through-hole in the front axle beam which is a workpiece | work. It is a figure for demonstrating the state in which the horizontal through-hole is formed in the front axle beam by press operation | movement. It is a figure for demonstrating the process which returns the driven slider contained in a press apparatus to an original position with an air cylinder, after forming a horizontal through-hole. It is a figure which shows the press operation | movement for forming a horizontal through-hole. It is a figure which shows the process of forming a horizontal through-hole by press operation. It is a figure which shows the process of returning a driven slider to an original position after forming a horizontal through-hole. It is a figure which shows the state of the press apparatus after a seat pressing process and a horizontal hole formation process are completed. It is a figure which shows the process of releasing the clamp mechanism of a press apparatus and taking out the front axle beam which is a workpiece | work from a press apparatus. FIG. 6 is a rear view of the front axle beam after the seat pressing process and the lateral hole forming process are completed.

Explanation of symbols

W Front axle beam 1 Press device 10 Spring seat of front axle beam 11 Beam body of front axle beam 12 Standing end portion of front axle beam 13 Bearing hole of front axle beam 100 Lower mold side structure of press device 106 Clamper mechanism 106a First 1 clamper (holds the upper end of the standing end)
106b 2nd clamper (gripping the upright wall at the center of the beam body)
106c 3rd clamper (gripping the spring seat)
DESCRIPTION OF SYMBOLS 120 Drive slider 122 Punch of driven slider 124 Inclined receiving surface of driven slider 126 Vertical surface of driven slider 128 Air cylinder for horizontal hole 200 Upper mold side structure of press device 204 Upper base plate 206 Seat pressing mold 208 Parallel groove 210 Central pressing mold 212 End Part holding type 214 Cushioning type cylinder 220 Slider driving body 222 Inclined driving surface 224 Competing vertical surface

Claims (8)

A method for manufacturing a front axle beam having a beam body extending in a vehicle width direction,
A slider driving body fixed to an upper mold side structure that performs a pressing operation by a downward movement and having an inclined driving surface;
A clamper mechanism that is provided in the stationary lower mold side structure and positions the front axle beam in a hot state formed by forging or casting in a state in which the front axle beam is mounted on the vehicle;
A driven slider provided on the lower mold side structure and laterally approaching the front axle beam positioned by the clamper mechanism, the driven slider being spaced apart from the front axle beam, wherein the tilt of the slider drive body A driven slider having an inclined receiving surface complementary to the driving surface;
A punch provided on the driven slider and extending toward the beam body of the front axle beam;
A pressing device including slider driving means for retracting the driven slider in a direction away from the front axle beam;
A molding process for producing a front axle beam molding by forging or casting;
A deburring step of deburring from the front axle beam in a hot state immediately after the forming step;
A positioning step of positioning the front axle beam in a state in which the axle beam in the hot state immediately after the deburring step is mounted on a vehicle by the clamper mechanism of the press device;
A through hole forming step of forming a through hole in the beam body,
In the through hole forming step, the slider driving body is moved downward by causing the pressing device to perform a pressing operation, and the follower is driven by the cooperation of the inclined driving surface of the slider driving body and the inclined receiving surface of the driven slider. After driving the slider laterally and in a direction approaching the front axle beam, a lateral through hole is formed in the beam body by the punch of the driven slider, and then the upper mold side structure is raised A method for producing a front axle beam, comprising: retracting the driven slider in a direction away from the front axle beam by the slider driving means. The beam body has an upright wall, an upper flange at the upper end of the upright wall, and a lower flange at the lower end of the upright wall;
The method for manufacturing a front axle beam according to claim 1, wherein the lateral through hole is formed in an upright wall of the beam body.   Prior to the through hole forming step, the slider drive body moves downward from the non-operating position where the driven slider moves by the slider drive means and does not interfere with the slider drive body when the slider drive body moves downward. The manufacturing method of the front axle beam according to claim 1 or 2, wherein the inclined driving surface is set at a standby position where the inclined driving surface can be received by the inclined receiving surface of the driven slider.   4. The through hole forming step of forming a through hole in the beam body, wherein a central portion in the longitudinal direction of the beam body is pressed by a center pressing die provided in the upper mold side structure. The manufacturing method of the front axle beam as described in claim | item. A method for manufacturing a front axle beam including left and right spring seats on which leaf springs are seated at both ends of a beam body extending in the vehicle width direction,
A slider driving body fixed to an upper mold side structure that performs a pressing operation by a downward movement and having an inclined driving surface;
Left and right seat pressing dies provided on the upper mold side structure corresponding to the left and right spring seats of the front axle beam and movable independently of each other;
A clamper mechanism that is provided in the stationary lower mold side structure and positions the front axle beam in a hot state formed by forging or casting in a state in which the front axle beam is mounted on the vehicle;
A driven slider provided on the lower mold side structure and laterally approaching the front axle beam positioned by the clamper mechanism, the driven slider being spaced apart from the front axle beam, wherein the tilt of the slider drive body A driven slider having an inclined receiving surface complementary to the driving surface;
A punch provided on the driven slider and extending toward the beam body of the front axle beam;
A pressing device including slider driving means for retracting the driven slider in a direction away from the front axle beam;
A molding process to produce a molded axle beam by forging or casting;
A deburring step of deburring from the front axle beam in a hot state immediately after the forming step;
A positioning step of positioning the front axle beam in a state in which the axle beam in the hot state immediately after the deburring step is mounted on a vehicle by the clamper mechanism of the press device;
A seat-pressing process in which left and right spring seats of the beam body are press-molded by the left and right seat-pressing dies;
A through hole forming step of forming a through hole in the beam body;
In the seat-pressing step, prior to the seat-pressing step, the driven slider is retracted by the slider driving means to a non-operating position that does not interfere with the slider driving body when the slider driving body moves down;
In the through-hole forming step, prior to the through-hole forming step, the driven slider receives the inclined driving surface of the slider driving body that moves downward from the inoperative position by the slider driving means. Set to a standby position that can be received by the surface;
In the seat pressing step, the seat pressing mold is set to an operating position where the left and right spring seats of the front axle beam can be press-molded,
In the through hole forming step, the slider driving body is moved downward by causing the pressing device to perform a pressing operation, and the follower is driven by the cooperation of the inclined driving surface of the slider driving body and the inclined receiving surface of the driven slider. After driving the slider laterally and in a direction approaching the front axle beam, a lateral through hole is formed in the beam body by the punch of the driven slider, and then the upper mold side structure is raised A method for producing a front axle beam, comprising: retracting the driven slider in a direction away from the front axle beam by the slider driving means.   In the seat pressing step, one of the left and right seat pressing dies is set to an operating position corresponding to one spring seat of the front axle beam, and the other seat pressing die is set to the other of the front axle beams. By performing the first press operation in a state of being retracted to the non-operating position away from the spring seat, the one spring seat of the front axle beam is press-molded, and then the other seat pressing die is The second press in a state in which the one pressing type is set to the operating position corresponding to the other spring seat of the front axle beam and the one pressing die is retracted to the non-operating position away from the one spring seat of the front axle beam. 6. The production of a front axle beam according to claim 5, wherein by performing an operation, the other spring seat of the front axle beam is press-molded. Law.   The upper mold side structure of the press device further includes left and right seat pressing drive means for moving the left and right seat pressing molds to the operating position and the non-operating position. The manufacturing method of the front axle beam as described. The upper die side structure of the press device further includes a center pressing die corresponding to a center portion located between the left and right spring seats of the front axle beam,
In the seat-pressing step, the center portion of the front axle beam is pressed by the center pressing mold,
The said through-hole formation process WHEREIN: When forming the said horizontal through-hole in the said beam main body with the said punch of the said driven slider, the center part of the said front axle beam is pressed down by the said center pressing die. The manufacturing method of the front axle beam as described in any one of Claims.

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