JP3558910B2 - Finishing equipment for crankshafts - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a crankshaft finishing machine mainly for finishing a journal portion and a pin portion of a crankshaft for an in-line four-cylinder engine.
[0002]
[Prior art]
Conventionally, as a processing apparatus of this kind, a processing unit having a plurality of processing tools for journals and pins is provided in accordance with the position of each journal part and each pin part of a crankshaft, and all the journal parts and pins of the crankshaft are provided. It is known to process a part simultaneously. If the crankshaft is for an in-line four-cylinder engine, a total of four machining tools for journals and one for each machining tool for each journal are provided on a common support of the machining unit. (See Japanese Utility Model Publication No. 3-33410).
[0003]
[Problems to be solved by the invention]
The conventional processing unit described above is dedicated for each crankshaft model, and it is necessary to newly manufacture a processing unit for a new model crankshaft having a different axial pitch between the journal portion and the pin portion. Costly.
[0004]
In this case, a plurality of support plates for supporting the processing tools for the journal and the pin, for example, nine support plates for an in-line four-cylinder crankshaft, are provided on the support base of the processing unit in parallel with the axial direction of the crankshaft. The support plate is movably supported in the X-axis direction, and by moving these support plates, the arrangement pitch of each processing tool can be adjusted in accordance with the axial direction pitch between the journal portion and the pin portion of the crankshaft to be processed. It is conceivable to have versatility.
[0005]
However, when each support plate is movable in the X-axis direction with respect to the support base, in order to secure the support rigidity of each support plate in the X-axis direction, the base of each support plate serving as a slide guide portion for the support base is required. It is necessary to make the length in the X-axis direction a certain degree or more, so that the arrangement pitch between the machining tool for the journal and the machining tool for the pin cannot be narrowed to the left due to the interference between the bases of the adjacent support plates. A crankshaft having a small axial pitch between the portion and the pin portion cannot be machined.
[0006]
In view of the above, an object of the present invention is to provide a highly versatile crankshaft finishing apparatus capable of processing a crankshaft having a small axial pitch between a journal portion and a pin portion. And
[0007]
[Means for Solving the Problems]
In order to solve the above problem, the present invention provides a crankshaft finishing machine including a machining unit equipped with a journal and a pin machining tool for performing a finishing process on a journal portion and a pin portion of a crankshaft. Is composed of three movable tables which are divided into three in the X-axis direction parallel to the axis of the crankshaft and are movable in the X-axis direction. A fixed support plate is erected on each of the first movable base, the second movable base located in the middle, and the third movable base located on the other side in the X-axis direction. A movable support plate facing the fixed support plate on each movable base in the X-axis direction is movably supported in the X-axis direction, and the fixed support plate on the first movable base is a first support plate and a second movable base. The first movable one of the upper fixed support plate and the movable support plate One support plate closer to the second movable plate, the other support plate is a third support plate, and one of the fixed support plate and the movable support plate on the third movable base is closer to the second movable base. As a fourth support plate and the other support plate as a fifth support plate, a processing tool for a first journal on a side surface on one side in the X-axis direction of the first support plate, and a third support plate for a second support plate. A processing tool for the first pin on one side surface in the X-axis direction facing the support plate, and a processing tool for the second journal on one side surface in the X-axis direction of the third support plate facing the second support plate. A processing tool for the second pin on one side of the fourth support plate in the X-axis direction facing the fifth support plate, and a processing tool for the one side in the X-axis direction of the fifth support plate facing the fourth support plate. A third journal processing tool is disposed on the side surface, and a first pin processing tool, a second journal processing tool, and a second pin processing tool are further disposed. The X-axis distance of the third journal processing tool from the first journal processing tool is three times, four times, and three times the axial pitch between the journal portion and the pin portion of the crankshaft to be processed, respectively. Adjustment means is provided for adjusting the positions of the second and third movable tables and the movable support plates on the movable tables in the X-axis direction with respect to the first movable table so that the magnification becomes 7 times or 8 times. .
[0008]
According to the present invention, each movable table functions as an X-axis direction slide guide section of each fixed support plate erected on the movable table, and the X-axis direction rigidity of the movable support plate on each of the second and third movable tables. Even if the length of the slide guide portion at the base of each movable support plate in the X-axis direction is made a certain value or more in order to secure the second and third slide guide portions of the fixed support plate. Since the movable support plates are supported on the movable bases, the movable support plates on the movable bases can approach the fixed support plates on the movable bases without causing interference between the slide guide portions of the two support plates. Further, both the journal and pin working tools on each of the second and third movable tables are arranged adjacent to each other in the X-axis direction between the opposed surfaces of the fixed support plate and the movable support plate on each movable table. By moving the movable support plate closer to the fixed support plate, the pitch of the processing tool for the second journal and the processing tool for the first pin on the second movable table in the X-axis direction and the pitch on the third movable table The X-axis direction arrangement pitch of the third journal processing tool and the second pin processing tool can be considerably reduced.
[0009]
On the other hand, the X-axis direction pitch of the processing tool for the first journal on the first movable table and the processing tool for the first pin on the second movable table, and the processing tool for the second journal on the second movable table. The X-axis direction arrangement pitch of the second pin working tool on the third movable base cannot be narrowed to the left, but in the present invention, these arrangement pitches are set to the X-axis direction pitch between the journal portion and the pin portion. Should be set to three times as large as above, and there is no problem.
[0010]
When processing the crankshaft W for an in-line four-cylinder engine as shown in FIG. 1, first, the first processing tool for the journal on the first movable base is moved from one axial end of the crankshaft W in the X-axis direction. It shifts to the first machining position that matches the first counted # 1 journal Wa. At the first machining position, the first pin machining tool on the second movable base is # 2 away from the # 1 journal Wa by 3p (p is the pitch between the journal and the pin in the X-axis direction). The pin portion Wb, the machining tool for the second journal on the second movable table is # 3 journal part 4p away from the journal of # 1 by 4p, and the machining tool for the second pin on the third movable table is # 1. The # 4 pin portion Wb 7p away from the journal portion matches the # 5 journal portion Wa 8p away from the # 1 journal portion with the third journal working tool on the third movable table, respectively. The journal portions Wa of # 1, # 3, and # 5 and the pin portions Wb of # 2 and # 4 can be simultaneously finished. Next, the entire processing unit is shifted to a second processing position shifted from the first processing position by 2p in one direction in the X-axis direction. At the second machining position, the first pin machining tool is # 1 pin portion Wb 1p away from the # 1 journal Wa, and the second journal machining tool is 2p away from the # 1 journal Wa. The second journal portion Wa, the second pin machining tool is # 3 pin portion Wb 5p away from the # 1 journal portion Wa, and the third journal machining tool is 6p away from the # 1 journal portion Wa # 4 and the journal portions Wa of # 2 and # 4 and the pin portions Wb of # 1 and # 3 can be simultaneously finished.
[0011]
As described above, according to the present invention, all the journal portions and the pin portions of the crankshaft can be efficiently finished in two operations, and the first pin processing tool to be adjusted to p and the first pin processing tool can be used. Since the pitch in the X-axis direction of the processing tool for journal No. 2 and the pitch in the X-axis direction of the processing tool for the second pin and the processing tool for third journal can be considerably narrowed as described above, the pitch from small p to large Finishing of various types of crankshafts is possible, improving versatility.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment in which the present invention is applied to an apparatus for finishing and processing an in-line four-cylinder crankshaft W as shown in FIG. 1 will be described.
[0013]
Referring to FIG. 2, reference numeral 1 denotes a machine of a finishing machine in which a headstock (not shown) and a tailstock that support the crankshaft W are arranged, and a journal portion of the crankshaft W is provided on the machine 1. First machining unit 2 having journal and pin machining tools 3J and 3P for performing first-stage finishing on Wa and pin portion Wb ₁ And a second processing unit 2 mounted with journal and pin processing tools 4J and 4P for performing a second-stage finishing process on the journal portion W and the pin portion Wb. ₂ Are arranged movably in the X-axis direction parallel to the axis of the crankshaft W along the common guide rail 2a on the machine base 1, and are mounted on the crankshaft W supported between the headstock and the tailstock. Both processing units 2 at the processing position facing ₁ , 2 ₂ Are selectively moved to perform the first-stage finishing and the second-stage finishing of the journal Wa and the pin Wb.
[0014]
Each processing unit 2 ₁ , 2 ₂ Is composed of three movable tables 20, 21, 22 divided into three in the X-axis direction and slidably supported by the guide rail 2a. A fixed support plate 20a is provided upright on the other side in the X-axis direction of the first movable base 20 located on one side (the right side in FIG. 2) in the X-axis direction among these three movable tables. The fixed support plates 21a, 22a are also provided upright on the other side of the second movable base 21 located in the middle in the X-axis direction and on one side of the third movable base 22 located on the other side in the X-axis direction. Have been. On the second and third movable tables 21 and 22, movable support plates 21b and 22b opposed to the fixed support plates 21a and 22a in the X-axis direction are provided on the guide rails 21c on the movable tables 21 and 22. , 22c so as to be movable in the X-axis direction. And each processing unit 2 ₁ , 2 ₂ The journal processing tools 3J and 4J of (1), the fixed support plate 21a and the movable support plate 21b on the second movable table 21 are provided on one side surface of the fixed support plate 20a on the first movable table 20 in the X-axis direction. Among them, on the side surface on one side in the X-axis direction of the movable support plate 21b, which is the support plate near the first movable base 20, facing the fixed support plate 21a, the processing tools 3P and 4P for pin (1) and the movement of the fixed support plate 21a On the side surface on one side in the X-axis direction opposite to the support plate 21b, (2) the journal processing tools 3J and 4J, and the fixed support plate 22a and the movable support plate 22b on the third movable table 22 closer to the second movable table 21 (2) Pin processing tools 3P and 4P on one side in the X-axis direction opposite to the movable support plate 22b of the fixed support plate 22a, and the X-axis opposed to the fixed support plate 22a of the movable support plate 22b. (3) Journal on one side Machining tool 3J, it is retractably supported on the Y-axis direction orthogonal to the X-axis direction toward the 4J respectively crankshaft W.
[0015]
First processing unit 2 ₁ The processing tools 3J and 3P for the journal and the pin mounted on the disk are composed of lapping tools for polishing with a lapping tape. As shown in FIG. 3, the journal wrapping tool 3J includes a pair of upper and lower clamp arms 32, 32 extending forward in the Y-axis direction and gripping a journal Wa on a tool body 31 supported by a tool carrier 30. At the tail end in the direction, a pivoting pin 32a in the X-axis direction is pivotally supported so as to be openable and closable in the vertical Z-axis direction, and a wrapping tape 33 is attached to opposing surfaces of the clamp arms 32, 32 in the Z-axis direction. It is configured. The two clamp arms 32, 32 are opened and closed by a cylinder 34 incorporated in the tool body 31 via a toggle link 34a. The clamp arms 32, 32 are closed to grip the journal Wa. As a result, the wrapping tape 33 is pressed against the peripheral surface of the journal Wa, and in this state, the crankshaft W is rotated to polish the journal Wa. In addition, the tool carrier 30 is provided with a lower pay-out reel 330 for the wrapping tape 33 and an upper take-up reel 331, and a plurality of guide pulleys 332 are provided between the reels 330 and 331 via a plurality of guide pulleys 332. A wrapping tape 33 is stretched between opposing surfaces of the clamp arms 32, 32, and a winding mechanism 333 driven by a cylinder 333a is mounted on the tool carrier 30, and the wrapping tape 33 is periodically wound to a predetermined length. It is wound around a take-up reel 331.
[0016]
The pin wrapping tool 3P is as shown in FIG. 4. Members common to the journal wrapping tool 3J are denoted by the same reference numerals as above, and description thereof is omitted. The main difference between the pin wrapping tool 3P and the journal wrapping tool 3J is that the tool main body 31 swings in the Z-axis direction and the Y-axis direction following the revolving motion of the pin portion Wb due to the rotation of the crankshaft W. A long hole 31b is formed in the tool body 31 in the Y-axis direction to be engaged with a support pin 31a fixed to the tool carrier 30, and the tool body 31 is freely movable in the Y-axis direction in the tool carrier 30, and This is a point that it is swingably supported in the Z-axis direction.
[0017]
Second processing unit 2 ₂ The machining tools 4J and 4P for the journal and the pin mounted on the machine are constituted by grinding tools for performing grinding with a superfinishing wheel. As shown in FIG. 5, the journal grinding tool 4J has a substantially C-shaped head portion that receives the journal portion Wa and opens forward in the Y-axis direction at a front end portion in the Y-axis direction of a tool body 41 supported by the tool carrier 40. 41a are formed, and slide bars 42 that can move forward and backward in the radial direction toward the journal portion Wa are inserted at three circumferential positions of the head portion 41a, and a super-finishing grindstone 43 is attached to the tip of each slide bar 42. It consists of The head portion 41a is provided with a substantially C-shaped cam plate 44 which is rotated in the circumferential direction by a cylinder 44a. A scroll-shaped cam plate 44 into which pins 42a planted on each slide bar 42 are inserted. When the cam groove 44b is formed and the cam plate 44 is rotated clockwise from the state shown in FIG. 5, each slide bar 42 advances radially inward, and the grindstone 43 is placed on the peripheral surface of the journal Wa. I try to abut. In the figure, reference numeral 44c denotes a pressing plate for the cam plate 44.
[0018]
The pin grinding tool 4P is as shown in FIG. 6, and the same members as those of the journal grinding tool 4J are denoted by the same reference numerals and the description thereof will be omitted. In the pin grinding tool 4P, similarly to the pin lapping tool 4P, the tool body 41 is provided with a tool carrier 40 so that the tool body 41 swings in the Z-axis direction and the Y-axis direction following the revolving motion of the pin portion Wb. A long hole 41d is formed in the Y-axis direction to be engaged with the support pin 41c fixed to the tool carrier 40, so that the tool body 41 can freely move in the Y-axis direction and swing in the Z-axis direction in the tool carrier 40. I support them.
[0019]
4 and 6, in the lapping tool 3P and the grinding tool 4P for the pins, the tool carriers 30, 40 are used for the tool bodies 31, 41 which are oscillated in the Z-axis direction by the cylinders 35a, 45a. And a pair of engaging grooves 35b, 35c, 45b, 45c are formed on the lower surfaces of the tool bodies 31, 41, spaced apart in the Y-axis direction. ₁ , 2 ₂ In the tools 3P and 4P for processing the pin portion Wb located at the near dead center position in the Y-axis direction that is closest to the side, the engagement claws 35d and 45d attached to the support levers 35 and 45 are engaged in the Y-axis direction. With the engagement of the mating grooves 35b and 45b, the tool bodies 31 and 41 are supported in a horizontal posture with the tool bodies 31 and 41 deflected in the Y-axis direction. ₁ , 2 ₂ In the tools 3P, 4P for processing the pin portion Wb located at the far dead center position in the Y axis direction furthest away from the side, the engagement grooves 35c, 45c are engaged with the engagement claws 35d, 45d. Then, the tool bodies 31 and 41 are supported in a horizontal posture with the tool bodies 31 and 41 deviated forward in the Y-axis direction. During the machining, the support levers 35 and 45 are swung and retracted downward, and the tool bodies 31 and 41 are pinned. The portion Wb can swing in accordance with the revolving motion of the portion Wb.
[0020]
The tool bodies 31 and 41 of the journal wrapping tool 3J and the grinding tool 4J may be fixed to the tool carriers 30 and 40 in a horizontal posture, but in the present embodiment, as shown in FIGS. , 40 are fixed to the support pins 31a, 41c, and the tool bodies 31, 41 are pivotally supported at the pin holes at the tail ends in the Y-axis direction, and the tool carriers 30, 40 are provided with support bolts 36, 46 for contacting the lower surface of the tool body. By mounting, the tool bodies 31 and 41 are supported in a horizontal posture.
[0021]
Each of the tools 3J, 3P, 4J, 4P is connected to each machining unit 2 ₁ , 2 ₂ The guide rails 3a, 4a fixed to the fixed support plates 20a, 21a, 22a and the movable support plates 21b, 22b on the movable tables 20, 21, 22 are slidable in the Y-axis direction on the tool carriers 30, 40. Supported. The cylinders 3b, 4b and the pinions 3d, 4d which are normally and reversely rotated by the cylinders 3b, 4b via the racks 3c, 4c are provided at the tail ends of the support plates 20a, 21a, 21b, 22a, 22b in the Y-axis direction. The levers 3e, 4e fixed to the pinions 3d, 4d are connected to the tool carriers 30, 40 via links 3f, 4f, and the tool carriers 30, 40, that is, the tools 3J, 3P are connected by the cylinders 3b, 4b. , 4J, 4P are made to advance and retreat in the Y-axis direction. In the pin wrapping tool 3P and the grinding tool 4P, the pieces 3g, 4g having the connecting pins of the levers 3e, 4e and the links 3f, 4f attached to the slots 3h, 4h at the tail ends of the links 3f, 4f. The pieces 3g and 4g are slidably engaged with each other, and the pieces 3g and 4g are adjusted in position by the adjusting screws 3i and 4i, so that the reciprocating strokes of the tools 3P and 4P in the Y-axis direction are adjusted by the journal Wa and the pin Wb of the crankshaft W. It can be adjusted according to the radial distance between them.
[0022]
Double processing unit 2 ₁ , 2 ₂ Are movable in the first machining unit 2 ₁ Movable table 20 and second processing unit 2 ₂ Are arranged in the X-axis direction in a state where they are adjacent to each other in the X-axis direction. And each processing unit 2 ₁ , 2 ₂ (1) Pin processing tools 3P and 4P on the second movable table 21 and (2) Journal processing tools 3J and 4J and (2) Pin processing tools 3P and 4P on the third movable table 22. The distance between the journal processing tools 3J and 4J in the X-axis direction from the journal processing tools 3J and 4J on the first movable base 20 of the journal processing tools 3J and 4J, respectively, is the journal portion of the crankshaft W to be processed. The second movable table 21 and the third movable table 22 with respect to the first movable table 20 are three times, four times, seven times, and eight times the axial pitch p between Wa and the pin portion Wb. An adjusting means 5 for adjusting the position of the movable support plates 21b and 22b on the movable tables 21 and 22 in the X-axis direction is provided.
[0023]
As shown schematically in FIG. 7, this adjusting means 5 is provided in each processing unit 2. ₁ , 2 ₂ The movable support plate 21b and the fixed support plate 21a on the second movable base 21 and the fixed support plate 22a and the movable support plate 22b on the third movable base 22 are positioned on the same axis in the X-axis direction, and the nut members are respectively provided. Both processing units 2 having screw portions 50a, 51a, 52a, and 53a to which 50, 51, 52, and 53 are attached and screwed to these nut members. ₁ , 2 ₂ Adjustment shaft 54 common to the second processing unit 2 ₂ Of the first movable base 20 are fixedly supported in the X-axis direction. In addition, the first processing unit 2 ₁ Of the first movable table 20 is the second processing unit 2 ₂ Is connected to the first movable base 20 via a tie rod 2b. ₁ , 2 ₂ The adjustment shaft 54 is loosely inserted into the fixed support plate 20 a on the first movable base 20. Also, the second processing unit 2 ₂ The first movable table 20 can be driven in the X-axis direction by a motor 2c via a ball screw mechanism 2d. ₁ , 2 ₂ Are shifted in the X-axis direction as a whole.
[0024]
Here, (1) the thread pitch of the nut member 50 attached to the movable support plate 21b on the second movable table 21 supporting the pin working tools 3P and 4P, and (2) the journal working tools 3J and 4J. The screw pitch of the nut member 51 attached to the fixed support plate 21a on the second movable base 21 to be supported, and the fixed support plate 22a on the third movable base 22 supporting the pin processing tools 3P and 4P of (2). The ratio of the screw pitch of the nut member 52 to the screw pitch of the nut member 53 attached to the movable support plate 22b on the third movable base 22 supporting the journal processing tools 3J and 4J is 3: 4: 7. : 8 Thus, if the axial pitch p between the journal portion Wa and the pin portion Wb changes by ± Δp due to the change of the model of the crankshaft W, the machining tools 3J and 4J for the journal (1) and the journal tools (1) for the journal (1) If the adjustment shaft 54 is rotated by the handle 54a at the end thereof so that the distance in the X-axis direction between the pin processing tools 3P and 4P becomes 3 (p ± △ p), the journal processing of (1) is performed. The distances from the tools 3J and 4J to the journal processing tools 3J and 4J of (2), the pin processing tools 3P and 4P of (2), and the journal processing tools 3J and 4J of (3) are as follows. 4 (p ± △ p), 7 (p ± △ p), 8 (p ± △ p). Therefore, even if the axial pitch p between the journal Wa and the pin Wb changes, the distance between the pin processing tools 3P and 4P of (1) and the journal processing tools 3J and 4J of (2) is changed. The X-axis direction arrangement pitch and the X-axis direction arrangement pitch between the pin processing tools 3P and 4P of (2) and the journal processing tools 3J and 4J of (3) are equal to p, and the journal processing of (1) The pitch between the tools 3J and 4J and the pin processing tools 3P and 4P in (1) in the X-axis direction, and the journal processing tools 3J and 4J in (2) and the pin processing tools 3P and 4P in (2). The positions of these processing tools 3J, 3P, 4J, 4P can be adjusted so that the arrangement pitch in the X-axis direction is equal to 3p.
[0025]
Further, the journal processing tools 3J and 4J and the pin processing tools 3P and 4P on the second and third movable tables 21 and 22 are fixed to the fixed support plates 21a and 22a and the movable support plates on the movable tables 21 and 22, respectively. 21b, 22b, and is arranged adjacent to each other in the X-axis direction. Even if the crankshaft W has a small axial pitch p between the journal Wa and the pin Wb, this pitch p Can be narrowed in the X-axis direction between the journal processing tools 3J, 4J and the pin processing tools 3P, 4P. Even when the arrangement pitch is minimized, the thickness of the journal processing tools 3J and 4J in the X-axis direction and the pin processing tool 3P are provided between the fixed support plates 21a and 22a and the movable support plates 21b and 22b. , 4P, the gap corresponding to the total thickness of the movable support plates 21b, 22c slidably engages with the guide rails 21c, 22c on the movable tables 21, 22. Is formed so as to protrude into this gap, the length of the slide guide in the X-axis direction is increased, and the rigidity of the movable support plates 21b and 22b in the X-axis direction can be secured. Further, the rigidity of the fixed support plates 21a and 22a in the X-axis direction can be secured by the length of the movable tables 21 and 22 functioning as the slide guides of the fixed support plates 21a and 22a in the X-axis direction. By supporting the movable support plates 21b and 22b on the tables 21 and 22, processing of the journal by mutual interference between the slide guide portions of the fixed support plates 21a and 22a and the slide guide portions of the movable support plates 21b and 22b. It is possible to prevent the reduction in the arrangement pitch in the X-axis direction between the tools 3J, 4J and the pin processing tools 3P, 4P from being restricted.
[0026]
When finishing the in-line four-cylinder crankshaft W as shown in FIG. ₁ , 2 ₂ In (1), the tool bodies 31 and 41 of the pin working tools 3P and 4P are supported with the tool carriers 30 and 40 deviated forward in the Y-axis direction with respect to the tool carriers 30 and 40. , 4P are supported in a state where they are displaced toward the Y-axis direction with respect to the tool carriers 30, 40, and the crankshafts # 1 and # 4 have pin portions Wb at near dead center positions, # 2. And the # 3 pin portion Wb is supported between the headstock and the tailstock with a phase at the position of the far dead center.
[0027]
And the first processing unit 2 ₁ Is shifted to the first machining position corresponding to the journal part Wa of # 1. At the first processing position, the processing tool 3P for (1) is the pin portion Wb of # 2, the processing tool 3J for the journal (2) is the journal portion Wb of # 3, and the processing tool 3P for the pin (2) is The pin portion Wb of # 4 and the journal machining tool 3J of (3) match the journal portion Wa of # 5, respectively. Next, the respective working tools 3J, 3P are advanced in the Y-axis direction toward the crankshaft W, and then the clamp arms 32, 32 of the respective working tools 3J, 3P are closed. The journal portion Wa and the pin portions Wb of # 2 and # 4 are gripped, and the crankshaft W is rotated and oscillated in the X-axis direction in this state, and the journal portion Wa and the pin portion Wb are polished.
[0028]
When the polishing is completed, the rotation of the crankshaft W is stopped at a phase where the pin portions Wb of # 1 and # 4 are at the near dead center position and the pin portions Wb of # 2 and # 3 are at the far dead center position. The processing tools 3J and 3P are once retracted in the Y-axis direction. Next, the crankshaft W is rotated half a turn so that the pin portions Wb of # 1 and # 4 are at the near-dead-center position and the pin portions Wb of # 2 and # 3 are at the near-dead-center position. The processing unit is shifted from the first processing position to a second processing position shifted to one side in the X-axis direction by a distance twice the pitch p in the X-axis direction between the journal Wa and the pin Wb. At the second machining position, the (1) pin machining tool 3P is the # 1 pin portion Wb, the (2) journal machining tool 3J is the # 2 journal portion Wa, and the (2) pin machining tool 3P is The pin portion Wb of # 3 and the journal machining tool 3J of (3) coincide with the journal portion Wa of # 4. Next, the machining tools 3J for journals (2) and (3) and the machining tools 3P for pins (1) and (2) are advanced in the Y-axis direction toward the crankshaft W, and then each machining tool 3J is processed. , 3P are closed to hold the journal portions Wa of # 2 and # 4 and the pin portions Wb of # 1 and # 3, and in this state, rotate the crankshaft W and in the X-axis direction. Oscillation is performed and the journal Wa and the pin Wb are polished.
[0029]
When the polishing of all the journal parts Wa and the pin parts Wb is completed as described above, the second processing unit 2 ₂ Is shifted to the first processing position similar to the above, and the journal parts Wa of # 1, # 3, and # 5 by the journal processing tools 4J of (1), (2), and (3); (2) The pin part Wb of # 2 and # 4 is super-finished by the pin processing tool 4P, and then the second processing unit 2 ₂ Is shifted to the second processing position similar to the above, and the journal processing tools 4J of (2) and (3) are used to process the journal portions Wa of # 2 and # 4, and the processing of pins (1) and (2) for pins. The super finishing of the pin portions Wb of # 1 and # 3 is performed by the tool 4p.
[0030]
Note that the crankshaft W is also oscillated in the X-axis direction at the time of superfinishing. If the axial length of the journal Wa or the pin Wb changes due to a change in the model of the crankshaft W, the amplitude of the oscillation is adjusted to cope with the change.
[0031]
【The invention's effect】
As is apparent from the above description, according to the present invention, all the journals and the pins of the crankshaft for the in-line four-cylinder engine can be efficiently finished in two operations, and the journals and the pins can be efficiently processed. Various types of crankshafts, from small to large in axial pitch, can be finished, improving versatility.
[Brief description of the drawings]
FIG. 1 shows a crankshaft.
FIG. 2 is a front view of an example of the apparatus of the present invention.
FIG. 3 is a side view of the tool in a forward state cut along the line III-III in FIG. 2;
FIG. 4 is a side view of the tool in a forward state cut along the line IV-IV in FIG. 2;
FIG. 5 is a side view of the tool in a forward state cut along line VV in FIG. 2;
FIG. 6 is a side view of a tool advancing state cut along a line VI-VI in FIG. 2;
FIG. 7 is a diagram schematically showing an adjusting unit.
[Explanation of symbols]
2 ₁ , 2 ₂ Processing unit 20 First movable table
21 second movable table 22 third movable table
20a, 21a, 22a Fixed support plate
20b, 21b, 22b Movable support plate
3J, 4J Journal processing tools 3P, 4P Pin processing tools
5 Adjusting means

Claims (1)

In a crankshaft finishing machine including a machining unit equipped with a journal and a pin machining tool for performing a finishing process on a journal portion and a pin portion of a crankshaft,
The support base of the processing unit is constituted by three movable bases movable in the X-axis direction, which are divided into three in the X-axis direction parallel to the axis of the crankshaft,
Among these movable tables, fixed support plates are provided on the first movable table located on one side in the X-axis direction, the second movable table located on the intermediate side, and the third movable table located on the other side in the X-axis direction, respectively. A movable support plate, which is opposed to a fixed support plate on each movable base in the X-axis direction, is movably supported in the second and third movable bases in the X-axis direction,
The fixed support plate on the first movable base is the first support plate, and one of the fixed support plate and the movable support plate on the second movable base, which is closer to the first movable base, is the second support plate, and the other is the other. The third support plate is a third support plate, one of the fixed support plate and the movable support plate on the third movable base is the fourth support plate near the second movable base, and the other is the fifth support plate. As a support plate for
A processing tool for the first journal on one side surface in the X-axis direction of the first support plate, and a processing tool for the first pin on one side surface in the X-axis direction of the second support plate facing the third support plate. A second journal processing tool on one side of the third support plate in the X-axis direction facing the second support plate; and a X-axis direction one side of the fourth support plate facing the fifth support plate. A second pin working tool and a third journal working tool on one side of the fifth support plate facing the fourth support plate in the X-axis direction,
Furthermore, the X-axis direction distances of the first pin processing tool, the second journal processing tool, the second pin processing tool, and the third journal processing tool from the first journal processing tool are respectively set. The second and third movable members are moved relative to the first movable base so as to be three times, four times, seven times, and eight times the axial pitch between the journal portion and the pin portion of the crankshaft to be machined. Adjusting means for adjusting the position of the table and the movable support plate on each movable table in the X-axis direction;
A crankshaft finishing machine.

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