JP4062065B2 - Front axle machining method, jig device for front axle machining, and front axle manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for processing a front axle, that is, a member for connecting left and right front wheels of an automobile, and processing for the same. For The present invention relates to a jig apparatus, and further relates to a method for manufacturing a front axle using the jig apparatus.
[0002]
[Prior art]
The front axle is a member that supports the left and right front wheels of the automobile at both ends thereof, and bears a part of the weight of the vehicle and generally has a steering function. In recent years, since the number of front-wheel drive or four-wheel drive vehicles has increased, it has a function to transmit driving force to the front wheels.
[0003]
Hereinafter, a general configuration of a front axle of an automobile will be described first. FIG. 7 (a) is a schematic view seen from the rear side of the vehicle in order to show the configuration around the front axle of a conventional vehicle employing a general Ackermann method as a steering mechanism, and FIG. 7 (b) is a front view. Fig. 7 (c) is a plan view of the axle from the top, Fig. 7 (c) is an elevation view of the front axle from the rear of the vehicle, and Fig. 7 (d) is a partial view showing the state near the kingpin holes at both ends of the front axle. It is a schematic diagram.
[0004]
In the figure, reference numeral 1 denotes a front axle, and the cross-sectional shape of the central portion thereof is generally formed in an H channel shape, and both end portions of the arms 1L (left side) and 1R (right side) are curved upward. ). Two leaf spring seats 2 </ b> L and 2 </ b> R for attaching leaf springs are provided on the upper surface of the central portion of the front axle 1 at positions symmetrical with respect to the left / right direction (longitudinal direction) of the front axle 1. These two leaf spring seats 2L and 2R are for attaching leaf springs (not shown) interposed between the two body springs (chassis).
[0005]
King pin holes 3L and 3R each having an axis that is inclined with the lower portion opened slightly outward in the vertical direction of the front axle 1 are formed through the front end portions of both arm portions 1L and 1R. A king pin (not shown) is inserted into each of the king pin holes 3L and 3R, and hub carriers 4L and 4R are attached to the king pins. Although not shown in the drawings, the front wheels (actually, wheel hubs of tires) are rotatably attached to the hub carriers 4L and 4R with the direction intersecting the axial length direction of the kingpin as a rotation axis. Accordingly, the front wheels attached to the hub carriers 4L and 4R can be steered by rotating around the king pins of the arms 1L and 1R of the front axle 1 as pivots.
[0006]
One end of the knuckle arm 5 is fixed to the king pin inserted into one king pin hole (right side in the example shown in FIG. 7) 3R, and the other end of the knuckle arm 5 is pivotally supported by one end of the drag link 6. On the other hand, as the steering wheel 7 rotates, the steering shaft 8 rotates, and this rotation is converted into a rotating motion of the pitman arm 10 via the steering gear 9, and the rotating motion of the pitman arm 10 is the drag link described above. Move 6 back and forth. As the drag link 6 moves back and forth, the knuckle arm 5 rotates about the king pin inserted into the king pin hole 3R as a pivot, and as a result, the hub carrier 4R rotates about the king pin as a pivot.
[0007]
On the other hand, the hub carrier 4R rotates the other hub carrier 4L around the king pin inserted into the king pin hole 3L via the tie rod arm 11R, the tie rod 12, and the tie rod arm 11L. Therefore, as a result of the rotation of the steering wheel 7, both the hub carriers 4R and 4L are simultaneously rotated in the same direction, and the steering operation is performed.
[0008]
By the way, the front axle as described above has conventionally been (1) processing for forming attachment surfaces of the leaf spring seats 2L and 2R with respect to a workpiece (workpiece) formed into the shape of the front axle, (2) It was processed through three steps in sequence: machining to open various holes penetrating the front axle 1 parallel to the surfaces of the leaf spring seats 2L and 2R, and (3) machining to open the kingpin holes 3L and 3R. .
[0009]
Here, as the process for forming the attachment surfaces of the leaf spring seats 2L and 2R in (1), for example, tapping or bolts necessary for attaching the leaf spring seats 2L and 2R to predetermined positions of the material to be processed are performed. It is necessary to process such as opening a through-hole for inserting a through hole. Further, as a process for opening various holes penetrating the front axle 1 in parallel with the surfaces of the leaf spring seats 2L and 2R in (2), for example, a king pin cotter (lock) as shown in FIG. It is necessary to open a pin) hole 3LL and a tapped hole (hole with a shock absorber tap cut) 3SL. Furthermore, as a process for opening the king pin holes 3L and 3R in (3), the through holes are formed by positioning (centering) very accurately at the tip portions of both arm portions 1L and 1R, which is also the longitudinal direction of the front axle. Processing that opens in an inclined direction is required.
[0010]
The following Patent Document 1 is known as a reference of the prior art.
[0011]
[Patent Document 1]
JP-A-3-21501
[0012]
[Problems to be solved by the invention]
As described above, conventionally, for the processing of the front axle, (1) the processing for forming the attachment surface of the leaf spring seat, (2) the leaf spring seat of the workpiece to be processed into the shape of the front axle, Three steps are required: machining to open various holes penetrating the front axle parallel to the surface, and (3) machining to open the king pin hole. Therefore, setup for each of the three machining steps is required. Specifically, it is necessary to fix the material to be processed after positioning it on a jig for each process. Conventionally, it was also necessary to use a dedicated processing machine for each processing step for the above-described three-stage processing. Further, in the above-described processing for opening the kingpin hole of (3), since the tip portions of the arm portions at both ends of the front axle where the kingpin hole is to be opened are curved upward, so-called chattering occurs and accurate There was also a problem that it was difficult to perform proper processing.
[0013]
The present invention has been made in view of the circumstances as described above, and enables a general-purpose processing machine to be used without using a dedicated processing machine. The front axle machining method that can improve the production efficiency and reduce the cost by reducing from 2 to 2 steps. For The purpose is to provide a jig device. Another object of the present invention is to provide a method of manufacturing a front axle using them.
[0014]
[Means for Solving the Problems]
The processing method of the front axle according to the present invention includes: processing for forming a leaf spring seat mounting surface on one side surface of the processing target material formed in the shape of the front axle; A processing method of a front axle that performs a process of opening a king pin hole penetrating to the other side surface and a process of opening a through hole from a direction intersecting the one side surface of the material to be processed, wherein the material to be processed is A first preparatory step in which the first side is held by a first jig capable of centering a position where the kingpin hole is opened, with the one side face in a direction to be a processing surface by a processing machine; A first processing step in which the processing machine performs processing for forming a leaf spring seat mounting surface and processing for opening a king pin hole in the processing target material held by the jig; The above A second preparatory step in which the position where the through-hole is opened is held by a second jig capable of centering in a direction intersecting with the machined surface of the machine tool; and the second jig And a second processing step of performing processing for opening the through hole on the held material to be processed by the processing machine.
[0015]
In such a front axle processing method of the present invention, as a first step, the material to be processed is centered at a position where at least a kingpin hole is opened with one side faced in a direction to be a processing surface by a processing machine. By holding the first jig that can handle the workpiece to be processed held by the first jig, there is a process for forming a leaf spring seat mounting surface and a process for opening a kingpin hole. As a second step, the material to be processed in the first step is centered at the position where the through hole is opened with one side faced in a direction intersecting the processing surface by the processing machine. By being held by a second jig capable of being processed, a processing machine opens a through hole in the material to be processed held by the second jig.
[0016]
According to the front axle machining method of the present invention, in the above invention, when holding the material to be processed in the first preparation step, both ends of the material to be processed are connected to the one side and the other side. The first jig is held by means for restricting movement in a direction and a direction crossing the direction.
[0017]
In such a front axle machining method of the present invention, when holding the material to be processed by the first jig, both ends of the material to be processed cross the direction and the direction connecting the one side surface and the other side surface. By being held by the means for restricting the movement in the moving direction, it is held so that chatter does not occur during the process of opening the kingpin hole.
[0018]
Furthermore, the front axle machining method according to the present invention uses the jig device in which the first jig and the second jig are integrally attached in the above-described invention, and the first and second jigs are integrated. It is characterized by carrying out the processing steps continuously.
[0019]
In such a method of processing a front axle according to the present invention, a jig device in which a first jig and a second jig are integrally attached is used, and the first and second processes are performed by a processing machine. Done continuously.
[0024]
Further, the jig device for processing the front axle according to the present invention includes processing for forming a leaf spring seat mounting surface on one side surface of the processing target material formed in the shape of the front axle, and both ends of the processing target material. A first jig for holding the plurality of workpieces to perform a process of opening a king pin hole penetrating from the one side to the other side, and a direction intersecting the one side with the workpieces A second jig for holding the plurality of workpieces in order to perform a process for forming a through hole from the first jig, and the first jig is positioned and placed on the first jig In the direction connecting the one side surface side and the other side surface side and the direction intersecting this direction, both ends of the workpiece to be processed positioned at predetermined positions on the first jig with respect to the base It has the means to restrict | limit movement, It is characterized by the above-mentioned.
[0025]
In such a jig device for processing a front axle according to the present invention, a leaf spring seat mounting surface is formed on one side surface of a workpiece to be processed formed into a plurality of front axle shapes held by a first jig. And a process of opening a kingpin hole penetrating from one side surface to the other side surface at both ends of the material to be processed, and a plurality of materials to be processed held by the second jig The material to be processed is positioned at a predetermined position on the first jig with respect to the pedestal on which the first jig is positioned and placed at the time when the through hole is opened from the intersecting direction. The movement of the both end portions in the direction connecting the one side surface and the other side surface and in the direction intersecting with this direction is restricted, so that chattering does not occur during the processing for opening the kingpin hole.
[0026]
Furthermore, the jig device for processing a front axle according to the present invention is characterized in that in the above-mentioned invention, there is provided means for detachably fixing the first jig and the second jig.
[0027]
In such a jig device for processing a front axle according to the present invention, in the above-described invention, the processing target material is held in advance in the first jig and the second jig, and attached as necessary. Can be processed.
[0028]
A method for manufacturing a front axle according to the present invention includes any one of the above-described front axle processing methods of the present invention.
[0029]
In such a front axle manufacturing method of the present invention, any of the above-described front axle processing methods of the present invention is included in the middle of the front axle manufacturing process.
[0032]
Furthermore, the method for manufacturing a front axle according to the present invention is characterized by using the jig device for processing a front axle according to any of the above-described present inventions.
[0033]
In such a method for manufacturing a front axle according to the present invention, any of the aforementioned front axle processing methods according to the present invention is performed during the front axle manufacturing process. jig The device is used.
[0034]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.
[0035]
FIG. 1 is a schematic perspective view showing an example of the overall configuration of a jig block JB as a jig device used in the method for processing a front axle according to the present invention.
[0036]
The jig block JB is configured in a substantially rectangular parallelepiped box shape as a whole. Specifically, the pedestal 21, the plate-like first jig mounting plate J10 erected perpendicularly to the pedestal 21, and the first jig mounting plate J10 perpendicular to the pedestal 21 and the first jig mounting plate J10. A plate-like second jig mounting plate J20 erected in parallel with the back surface is a main component.
[0037]
A spacer having an appropriate width is inserted between the first jig mounting plate J10 and the second jig mounting plate J20, specifically, a spacer 231 on the upper surface and spacers 232 and 233 on both side surfaces. The space of the widths of the spacers 232 and 233 on both side surfaces is set between the first jig mounting plate J10 and the second jig mounting plate J20. Further, the distance between the spacers 232 and 233 on both side surfaces is smaller than the size of the first jig mounting plate J10 and the second jig mounting plate J20, and the first jig mounting plate J10 and the second jig mounting. A space is formed behind the left and right ends of the plate J20.
[0038]
And the 1st jig | tool clamp 23 for fixing the 1st jig | tool J1 mentioned later is provided in the four corners of the 1st jig | tool mounting plate J10. Each clamp 23 includes a cylinder 23C disposed behind the first jig mounting plate J10, in other words, at a distance from the second jig mounting plate J20, and a first jig mounting from the cylinder 23C. It consists of a piston 23P protruding to the surface of the plate J10 and a fixture 23F attached to the tip of each piston 23P.
[0039]
Although not shown in FIG. 1, second jig clamps 24 for fixing a second jig J2 described later are also provided at the four corners of the second jig mounting plate J20. Each clamp 24 has the same configuration as each of the clamps 23 described above, and is a cylinder disposed behind the second jig mounting plate J20, in other words, at a portion spaced from the first jig mounting plate J10. 24C, a piston 24P protruding from the cylinder 24C to the surface of the first jig mounting plate J10, and a fixture 24F attached to the tip of each piston 24P.
[0040]
In addition, table clamps 25 for fixing the entire jig block JB to the table of the processing machine are provided on the both sides of the space between the first jig mounting plate J10 and the second jig J2 of the base 21, for example. Each is equipped with. On the bottom surface of the pedestal 21, grooves 260 to 263 for positioning when the jig block JB is fixed to the table of the processing machine are provided.
[0041]
FIG. 2 is a schematic perspective view showing a state in which the first jig J1 is set on the centering unit 30 which is a positioning device for processing the front axle according to the present invention.
[0042]
The centering unit 30 is basically for positioning and fixing individual workpieces (hereinafter referred to as workpieces) 1W formed in the shape of the front axle to the first jig J1. In the embodiment, as an example, five workpieces 1W are collectively fixed to the first jig J1. In the following, the longitudinal direction (X direction in FIG. 2) of the workpiece 1W is defined as the left-right direction of the centering unit 30, and the Y direction orthogonal thereto is defined as the up-down direction.
[0043]
A base 31 of the centering unit 30 is provided with a reference key 32 for positioning and setting the first jig J1. This reference key 32 is a convex member provided at least at both ends in the up-down direction at the center in the left-right direction of the base 31, and is used for positioning provided on the back surface along the center line in the left-right direction of the first jig J1. When the groove 321 is fitted, the first jig J1 is positioned in the left-right direction with respect to the centering unit 30.
[0044]
In addition, reference blocks 33 are fixed at two positions sandwiching the reference key 32 at least one end in the vertical direction of the base 31 of the centering unit 30. The reference block 33 is for vertical positioning when the first jig J1 is set on the centering unit 30.
[0045]
Further, the left and right ends of the pedestal 31 of the centering unit 30 are for positioning the arm portions 1L and 1R of the workpiece 1W, in other words, for positioning (centering) the kingpin holes 3L and 3R. Sequence block 34 is installed. Each sequence block 34 includes a main body 341 installed on the base 31 and a positioning member 342 attached to the main body 341 toward the center of the base 31 and reciprocating toward the center.
[0046]
The positioning member 342 has a front portion Tip It is formed in a substantially V shape that opens toward the base, and can move forward and backward in the left-right direction with respect to the main body 341 installed on the pedestal 31, and moves from a side near the main body 341 to a predetermined position inside. By doing so, positioning can be performed so as to hold the tip portions of the arm portions 1L, 1R provided with the kingpin holes 3R, 3L of the workpieces 1W.
[0047]
A pressing clamp 35 for fixing each workpiece 1W is provided at the center in the left-right direction of the first jig J1. Further, fixed clamps 36 for clamping and fixing the arm portions 1L, 1R of each workpiece 1W from both sides in the vertical direction are provided at positions near both ends in the left-right direction of the first jig J1.
[0048]
FIG. 3 is a schematic diagram for illustrating a state in which each workpiece 1W is positioned and held on the first jig J1. 3A is a plan view, and FIG. 3B is a side view.
[0049]
Each work 1W is placed on the first jig J1 by the pedestals 38 and 38 at the lower part of the leaf spring seats 2L and 2R. As a whole, the center portion is pressed by the pressing clamp 35 described above. It is held by the first jig J1. The arm portions 1L and 1R at both ends are fixed from both sides by the fixing clamp 36 described above. Further, although not shown in FIG. 2 described above, the chattering prevention clamp 37 supports the lower side of the position closest to the portion where the king pin holes 3R, 3L close to the tips of the arms 1L, 1R are to be opened. Yes.
[0050]
The method of using the centering unit 30 as described above is as follows. First, the first jig J1 is positioned and placed on the centering unit 30 using the reference key 32 and the reference block 33, and then the five workpieces 1W are arranged at approximate positions on the first jig J1. Is placed. Next, the positioning member 342 of each sequence block 34 is moved from the main body 341 side to the inside to a predetermined position, thereby positioning each workpiece 1W in the longitudinal direction (left-right direction), in other words, a kingpin hole of each workpiece 1W. 3R and 3L are centered. In this state, the arm portions 1L and 1R of each workpiece 1W are fixed from both sides by the respective fixing clamps 36, the central portion of each workpiece 1W is fixed by the holding clamp 35, and both arm portions 1L and 1L are fixed by the chattering prevention clamp 37. The position closest to the position where the king pin holes 3R and 3L at the tip of 1R are to be opened is clamped and fixed from the first jig J1 side. As described above, the five workpieces 1W are held in a state of being positioned with respect to the first jig J1 on the first jig J1 positioned and placed on the centering unit 30.
[0051]
FIG. 4 is a schematic diagram showing a state where the first jig J1 in which the five workpieces 1W are positioned and fixed as described above is attached to the jig block JB. However, FIG. 4 shows a state where the processing of mounting the leaf spring seats 2L, 2R (opening of bolt holes, tap holes, etc.) and the processing of opening the kingpin holes 3R, 3L are completed.
[0052]
The first jig J1 is positioned and fixed to the first jig mounting plate J10 of the jig block JB by the first jig clamps 23 arranged at the four corners. In this state, each workpiece 1W is in a state in which the surface on which the mounting surface of each leaf spring seat 2L, 2R is machined is orthogonal to the surface of the base 21 of the jig block JB, in other words, on the front surface of the jig block JB. It is in the state of facing. In addition, each workpiece 1W has a holding clamp 35. And kingpin holes 3R, 3L The clamp 37 for preventing chatter is located below the position closest to the portion where the valve should be opened. When Needless to say, these are fixed to the first jig J1, but they are not shown in FIG.
[0053]
In the state shown in FIG. 4, the positions (working parts) where the king pin holes 3R and 3L of each workpiece 1W are to be opened are positioned with respect to the first jig J1 by the centering unit 30 shown in FIG. Yes. The first jig J1 is also positioned by the first jig clamp 23 with respect to the jig block JB. Furthermore, the jig block JB itself is positioned and fixed by the table clamp 25 with respect to the table of the processing machine.
[0054]
Therefore, in the state shown in FIG. 4, the jig block JB is positioned and fixed by a table clamp 25 on a processing machine, for example, a general-purpose lathe, more specifically, a processing table of an NC horizontal boring lathe with an indexing table. Thus, the processing of the mounting surfaces of the leaf spring seats 2L and 2R and the processing of opening through the kingpin holes 3R and 3L can be performed by a general-purpose lathe. Further, at this time, the portion immediately adjacent to the position where the king pin holes 3R and 3L at the tip portions of the arm portions 1L and 1R at both ends of each workpiece 1W are to be opened is supported by the chattering prevention clamp 37 from the first jig J1 side. Therefore, chattering of the arm portions 1L and 1R is suppressed during machining for opening the kingpin holes 3R and 3L, and the kingpin holes 3R and 3L can be accurately opened.
[0055]
FIG. 5 shows each workpiece after the processing of the mounting surface of the leaf spring seats 2L and 2R and the processing of opening through the kingpin holes 3R and 3L using the first jig J1 as described above. It is a mimetic diagram showing the state where 1W was held in the 2nd jig J2.
[0056]
The second jig J2 includes a leaf spring seat clamp device 50 that clamps the leaf spring seats 2L and 2R of the workpiece 1W in a predetermined position, and a king pin hole that clamps the king pin holes 3R and 3L of the arm portions 1L and 1R in a predetermined position. A clamping device 40 is attached at a predetermined position.
[0057]
In the leaf spring seat clamp device 50, the workpiece 1W is placed on the leaf spring seats 2L and 2R on the lower surface (the upper surface may be used. ) Each workpiece 1W on the base 51 fixed in a state protruding from the second jig J2 at a predetermined position on the second jig J2. The processed leaf spring seats 2L and 2R are placed and clamped by a clamp 52 from above.
[0058]
Further, the king pin hole clamp device 40 clamps the king pin holes 3R and 3L of each workpiece 1W held at the predetermined position of the second jig J2 by the leaf spring seat clamp device 50 as described above from both the upper and lower sides. 41 is configured to be clamped.
[0059]
With the above configuration, in the embodiment of the present invention, the five workpieces 1W are respectively held at predetermined positions on the second jig J2.
[0060]
FIG. 6 shows each workpiece 1W after the processing of the mounting surface of the leaf spring seats 2L, 2R and the processing of opening through the kingpin holes 3R, 3L performed by the first jig J1 described above. It is a schematic diagram which shows the state set to the 2nd jig | tool mounting plate J20 of the jig | tool block JB in the state hold | maintained at the 2nd jig | tool J2. However, each workpiece 1W is moved by the leaf spring seat clamp device 50 and the kingpin hole clamp device 40. Second jig J2 Needless to say, they are not shown in the same manner as in the case of the first jig J1 shown in FIG.
[0061]
As mentioned above, this Each workpiece 1W is held by the second jig J2 as a lower surface (or an upper surface) that has been subjected to the processing of the mounting surfaces of the leaf spring seats 2L and 2R and the processing of opening the kingpin holes 3R and 3L. Yes. In other words, each workpiece 1W is set on the jig block JB in a state where the workpiece 1W is rotated by 90 degrees about the longitudinal direction as an axis.
[0062]
Therefore, in the state shown in FIG. 6, by positioning and fixing the jig block JB to the processing table of a general-purpose lathe with the table clamp 25, a hole in the axial direction parallel to the mounting surface of the leaf spring seats 2L and 2R is obtained. For example, the processing for opening the cotter (lock pin) hole 3LL of the king pin holes 3R and 3L, the tapped hole (hole with a shock absorber tap cut) 3SL, and the like can be performed by a general-purpose lathe.
[0063]
By the way, the entire work procedure by the front axle machining method of the present invention as described above is as follows. First, the workpiece 1W is set on the first jig J1, and the first jig J1 is set on the jig block JB. Then, necessary processing (processing of the mounting surface of the leaf spring seats 2L and 2R and opening of the kingpin holes 3R and 3L) is performed on each workpiece 1W on the first jig J1 set in the jig block JB. Do. When processing on all the workpieces 1W on the first jig J1 is completed, the first jig J1 is removed from the jig block JB.
[0064]
Thus, each workpiece 1W that has been processed on the first jig J1 is set on the second jig J2, and the second jig J2 is set on the jig block JB. Then, necessary processing for the workpiece 1W on the second jig J2 set in the jig block JB (king pin holes 3R, 3L cotter (lock pin) holes 3LL, tapped holes (cutting shock absorber taps) Hole) 3SL etc. is opened.
[0065]
On the other hand, when a new workpiece 1W is set in the first jig J1 during this period, and the machining of the workpiece 1W on the second jig J2 is completed, the first jig J1 is removed from the jig block JB. Immediately set the first jig J1 on the jig block JB. Thereafter, the above-described work procedure is continuously repeated.
[0066]
It should be noted that by installing processing machines on both sides of the jig block JB, the first jig J1 and the second jig J2 are set on the jig block JB at the same time, and both are processed simultaneously. It may be.
[0067]
As described above, the processing of the mounting surfaces of the leaf spring seats 2L and 2R with the workpieces 1W set on the first jig J1, the processing of opening through the kingpin holes 3R and 3L, and the second jig Two steps of opening through a hole in the axial length direction parallel to the mounting surface of the leaf spring seats 2L, 2R with each workpiece 1W set to J2, for example, cotter holes of the kingpin holes 3R, 3L, etc. By performing this machining process using a general-purpose lathe instead of a dedicated machining machine as in the prior art, the front axle can be machined from the workpiece 1W and completed.
[0068]
Note that the front axle manufacturing method of the present invention includes the above-described front axle processing method of the present invention in the middle of the process, and can improve the efficiency of the entire front axle manufacturing process. Become.
[0069]
The front axle manufacturing method of the present invention uses the above-described front axle processing positioning device of the present invention when the front axle processing method of the present invention as described above is performed in the middle of the process. Therefore, the entire manufacturing process of the front axle can be made efficient.
[0070]
Furthermore, the manufacturing method of the front axle of the present invention includes a jig device for processing the front axle of the present invention as described above when the front axle processing method of the present invention is performed in the middle of the process. This makes it possible to improve the efficiency of the entire front axle manufacturing process.
[0071]
【The invention's effect】
As described in detail above, according to the front axle processing method of the present invention, conventionally, (1) processing for forming the mounting surface of the leaf spring seat, and (2) penetrating the front axle parallel to the surface of the leaf spring seat. 3 steps of opening various holes and (3) opening of kingpin holes were necessary, but the above-mentioned steps (1) and (3) can be performed in one step. Therefore, simplification of the machining process is realized, and thereby it is possible to improve the production efficiency and to produce an excellent effect that the cost can be reduced.
[0072]
Also, in the above-described processing for opening the king pin hole of (3), the tip ends of the arm portions at both ends of the front axle where the king pin hole should be opened are curved upward, but this portion is securely fixed. Therefore, it is possible to prevent so-called chattering.
[0073]
Also for processing the front axle of the present invention of According to the jig apparatus, there is an excellent effect that the above-described front axle machining method of the present invention can be easily realized.
[0074]
Furthermore, according to the front axle manufacturing method of the present invention, since the front axle processing method of the present invention as described above is included in the middle of the process, the processing process is simplified, thereby improving the production efficiency. It is possible to reduce the cost while at the same time. Furthermore, when processing the above-mentioned (3) opening the king pin hole, the tip of the arm part at both ends of the front axle where the king pin hole should be opened is curved upward, but this part is securely fixed. Therefore, it is possible to prevent so-called chattering.
[0075]
Furthermore, according to the method for manufacturing a front axle of the present invention, it is possible to easily realize the front axle processing method of the present invention as described above during the process.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view showing an example of the overall configuration of a jig block used in a method for processing a front axle according to the present invention.
FIG. 2 is a schematic perspective view showing an overall configuration example of a centering unit which is a positioning device for processing a front axle according to the present invention.
FIG. 3 is a schematic diagram showing a state in which individual workpieces are positioned and held by a first jig.
FIG. 4 is a schematic view showing a state in which a first jig in which five workpieces are positioned and fixed is attached to a jig block of the present invention.
FIG. 5 shows a state in which each workpiece is held by the second jig after the mounting surface of the leaf spring seat is processed using the first jig and the processing that opens through the kingpin hole is performed. It is a schematic diagram shown.
FIG. 6 is a schematic view showing a state in which a second jig holding a workpiece is set on a jig block.
FIG. 7 is a diagram illustrating a configuration example of a general front axle.
[Explanation of symbols]
1 Front axle
1L, 1R arm
2L, 2R leaf spring seat
3R, 3L King pin hole
3LL, 3LR Cotter hole
30 Centering unit
23 First jig clamp
32 Reference key
321 Positioning groove
34 Sequence block
36 Fixed clamp
37 Chatter clamp

Claims (7)

Forming a leaf spring seat mounting surface on one side of the workpiece to be machined into the shape of the front axle, and opening king pin holes penetrating from the one side to the other side at both ends of the workpiece A processing method of a front axle that performs processing and processing for opening a through hole from a direction intersecting the one side surface in the processing target material,
A first preparation step of holding the material to be processed in a first jig capable of centering a position where the kingpin hole is opened with the one side surface directed in a direction to be a processing surface by a processing machine. When,
A first processing step of performing processing for forming a leaf spring seat mounting surface and processing for opening a kingpin hole on the processing target material held by the first jig by the processing machine;
A second jig for holding the workpiece to be held by a second jig capable of centering a position where the through hole is opened with the one side faced in a direction intersecting a machining surface by the machining machine. A preparation process;
A processing method of a front axle, comprising: a second processing step of performing processing for opening the through hole on the processing target material held by the second jig by the processing machine.   When holding the material to be processed in the first preparation step, by means for restricting movement of both ends of the material to be processed in a direction connecting the one side surface side and the other side surface side and a direction intersecting with this direction. The front axle processing method according to claim 1, wherein the first jig is held by the first jig.   2. The first and second processing steps are continuously performed using a jig device in which the first jig and the second jig are integrally attached. The processing method of the described front axle. Forming a leaf spring seat mounting surface on one side of the workpiece to be machined into the shape of the front axle, and opening king pin holes penetrating from the one side to the other side at both ends of the workpiece A first jig for holding the plurality of workpieces to perform processing,
A second jig for holding the plurality of processing target materials in order to perform processing to open a through hole in a direction intersecting the one side surface in the processing target material;
The first jig has both ends of the workpiece to be processed positioned at predetermined positions on the first jig with respect to a pedestal on which the first jig is positioned and placed. A jig device for processing a front axle, characterized in that it has means for restricting movement in a direction connecting one side surface and the other side surface and a direction crossing this direction. The jig apparatus for processing a front axle according to claim 4 , further comprising means for detachably fixing the first jig and the second jig.   A method for manufacturing a front axle, comprising the method for processing a front axle according to any one of claims 1 to 3. A method for manufacturing a front axle, comprising using the jig device for processing a front axle according to claim 4 or 5 .

Images