JP2006181676A - Crankshaft polishing equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crankshaft polishing apparatus capable of polishing with one kind of wrap film and a clamp arm even when a crankshaft having a different pin width or journal width is polished.
SOLUTION: A film supply unit 12 that sequentially feeds wrap film 11, and a cutter 18 that cuts the wrap film 11 fed from the film supply unit 12 in accordance with the width of a pin portion 2 or a journal portion 4 of a crankshaft 1. The pin part 2 or the journal part 4 of the crankshaft 1 is clamped together with the film cut part 13 provided with the wrap film 11 cut to the pin part width or the journal part width, and at least the crankshaft 1 and the lap film 11 are relatively A clamp polishing unit 15 including a first arm 25 and a second arm 26 that rotate and polish the pin unit 2 or the journal unit 4 is provided.
[Selection] Figure 2

Description

  The present invention relates to a crankshaft polishing apparatus for polishing a pin portion or a journal portion of a crankshaft by a relative rotational movement between a wrap film and the crankshaft.

  For example, the pin part and journal part of the crankshaft, which is one of the engine parts of automobiles, function as sliding parts, so increasing the surface roughness reduces friction (frictional force) and improves fuel efficiency. It is known to be connected.

As a polishing apparatus for increasing the surface roughness of the pin part and the journal part, a feed mechanism for sequentially guiding the wrap film is provided on a shoe having a concave gripping part provided on the opposing surfaces of a pair of clamp arms, An apparatus has been proposed in which a crankshaft is clamped together with a wrap film by a gripping portion, and a lap process is performed by relatively rotating the crankshaft and the wrap film (for example, see Patent Document 1).
JP-A-9-136257 (pages 3 and 4; FIGS. 1 to 3)

  By the way, the crankshaft differs in the width of the pin portion or the journal portion which is a polished portion depending on the type of engine. So far, when trying to polish crankshafts of different sizes with the same equipment, the clamp arm, shoe and wrap film are completely replaced for each pin or journal width. That is, a clamp arm, a shoe, and a wrap film are prepared as dedicated parts for each crankshaft having a different pin portion or journal portion width.

  In particular, replacing the wrap film requires a lot of man-hours, and if different crankshafts are allowed to flow in the same line, a lot of setup change man-hours are generated. In addition, if a large number of clamp arms are prepared for different crankshafts, a large capital investment is required.

  Therefore, an object of the present invention is to provide a crankshaft polishing apparatus that can polish a crankshaft having a different pin portion width or journal portion width with a single wrap film and a clamp arm. .

  The present invention includes a film supply means for sequentially feeding wrap film, a film cutting means for cutting the wrap film fed from the film supply means in accordance with the width of the pin portion or journal portion of the crankshaft, A first arm and a second arm for clamping a pin portion or a journal portion of a crankshaft together with a lap film cut to a width of the journal portion, and polishing the pin portion or the journal portion by relatively rotating at least the crankshaft and the wrap film. And a clamp polishing means comprising an arm.

  According to the present invention, since the film cutting means for cutting in accordance with the width of the pin portion or journal portion of the crankshaft is provided, several types of crankshafts having different pin portion widths or journal portion widths are provided as one type of wrap film. Can be polished. Therefore, according to the present invention, it is not necessary to prepare a wrap film for each crankshaft having a different pin portion width or journal portion width, and it is troublesome to replace a dedicated wrap film according to the pin portion width or the journal portion width. Replacement work can be eliminated.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

"Configuration of crankshaft polishing equipment"
1 is a plan view of a crankshaft, FIG. 2 is a schematic configuration diagram showing a crankshaft polishing apparatus, FIG. 3 is a block diagram of the crankshaft polishing apparatus, and FIG. 4 is an enlarged perspective view of a main part showing film cutting means. 5 is an enlarged side view of a main part showing an enlarged polished portion, FIG. 6 is an enlarged front view of an essential portion showing an enlarged polished portion, and FIG. 7 is an example of a pitch adjusting means for changing the arrangement pitch of the clamping means. FIG. 8 is an enlarged plan view of the main part of the pitch adjusting means for changing the arrangement pitch of the clamping means.

  First, the crankshaft polished by the polishing apparatus of the present embodiment will be described. As shown in FIG. 1, the crankshaft 1 is for a four-cylinder engine, for example, and has four pin portions 2 (first pin portion 2A, second pin) to which four piston rods (not shown) are rotatably attached. Portion 2B, third pin portion 2C, and fourth pin portion 2D).

  The first pin portion 2A, the second pin portion 2B, the third pin portion 2C and the fourth pin portion 2D are arranged on the center of rotation of the crankshaft 1 via a crank arm (counter weight) 3. The pin portions 2 </ b> A to 2 </ b> D are eccentric with respect to the journal portion 4 in the radial direction.

  The first pin portion 2A, the second pin portion 2B, the third pin portion 2C, and the fourth pin portion 2D have phases shifted relative to the rotation center of the crankshaft 1 by 180 degrees, and The first pin portion 2A and the fourth pin portion 2D, and the second pin portion 2B and the third pin portion 2C have the same phase.

  Next, the crankshaft polishing apparatus of the present embodiment for polishing the surface of the pin portion 2 or the journal portion 4 of the crankshaft 1 will be described.

  As shown in FIGS. 2 and 3, the polishing apparatus 10 includes a film supply unit 12 that is a film supply unit that sequentially supplies the wrap film 11, and a wrap film 11 that is supplied from the film supply unit 12. Film cutting part 13 which is a film cutting means for cutting in accordance with the width of the part 2 or the journal part 4, an unnecessary film winding part 14 which is a film winding means for winding the cut unnecessary wrap film 11, and a pin part The pin part 2 or the journal part 4 of the crankshaft 1 is clamped together with the wrap film 11 cut to the width or the journal part width, and at least the crankshaft 1 and the lap film 11 are relatively rotated so that the pin part 2 or the journal part 4 is A clamp polishing section 15 which is a clamp polishing means for polishing; The film recovery unit 16 that winds and recovers the polished wrap film 11 and the width of at least the pin portion 2 or the journal portion 4 of the crankshaft 1 to be polished are detected before polishing, and the detected information is used as a film. And a workpiece detection unit 17 which is a workpiece information detection means to be sent to the cutting unit 13.

  The wrap film 11 has a film width that matches at least the maximum width of the pin portion 2 or the journal portion 4 of the crankshaft 1 to be polished. Of course, the width of the wrap film 11 may be wider than the maximum width of the pin portion 2 or the journal portion 4, but if a film having an excessively wide width is used, it is wasted, so it is almost the same as the maximum width. Is desirable.

  As shown in FIG. 2, the film supply unit 12 winds the wrap film 11 around a peripheral surface such as a roll, and the film recovery unit 16 passes through the film cut unit 13 and the clamp polishing unit 15 by a feeding mechanism (not shown) from the roll. It is designed to feed out sequentially.

  As shown in FIG. 4, the film cutting unit 13 includes a cutter 18 that cuts the wrap film 11 to a predetermined width, and a film holding piece 19 that sandwiches the wrap film 11 lightly from its thickness direction so that no cutting failure occurs. Is provided. The cutter 18 is disposed on one surface of the wrap film 11, and cuts the wrap film 11 by pressing its tip against the wrap film 11 that is fed to the clamp polishing unit 15. For the cutter 18, a needle or a knife is used.

  As shown in FIG. 3, the cutter 18 is fixed to a cutter mounting member 22 that is screwed into a ball screw 21 that is rotated by a servo motor 20 for driving the cutter and is movable in the width direction of the wrap film 11. . The cutter 18 is a servo for driving the cutter according to an instruction from the cutter movement control unit 23 based on the workpiece information such as the pin portion width WP or the journal portion width WJ of the crankshaft 1 detected by the workpiece detection unit 17 described later. When the motor 20 is driven and controlled, the wrap film 11 is moved to a predetermined width position.

  The workpiece information detected by the workpiece detector 17 is sent to the main machining control unit 24 that drives and controls the entire polishing apparatus, and is transmitted from the main machining control unit 24 to the cutter movement control unit 23. The cutter movement control unit 23 moves the cutter driving servo motor 20 based on the workpiece information, rotates the ball screw 21 and fixes the cutter 18 fixed to the cutter mounting member 22 to the pin portion of the crankshaft 1 to be processed. The wrap film 11 is moved directly above the width WP or the journal width WJ. Then, by pressing the tip of the cutter 18 against the traveling wrap film 11, the wrap film 11 is cut to the pin portion width WP or the journal portion width WJ of the crankshaft 1 to be processed.

  The film holding pieces 19 are provided on both sides of the cutter 18 (front and rear in the traveling direction of the wrap film 11), and are arranged vertically so that the wrap film 11 is lightly pressed from the thickness direction and sandwiched. By providing the film holding piece 19, tension is applied to the wrap film 11, and cutting failure when the cutter 18 is pressed against the wrap film 11 and cut is prevented.

  The crankshaft 1 is polished by rotating the crankshaft 1 around the journal portion 4 as the center of rotation, so that the supply position of the wrap film 11 is farther in the journal portion 4 than in the pin portion 2. Therefore, it is desirable to provide the film cut portion 13 in the vicinity of the clamp polishing portion 15 in order to give the tension of the wrap film 11.

  The unnecessary film winding part 14 is arrange | positioned in the vicinity of the film cut part 13, as shown in FIG. 2, and winds up the unnecessary wrap film 11 cut. By providing the unnecessary film take-up portion 14, the cut unnecessary wrap film 11 can be collected.

  As shown in FIG. 2, the clamp polishing portion 15 has a first arm 25 and a second arm 26 that clamp the pin portion 2 or the journal portion 4 of the crankshaft 1. The first arm 25 and the second arm 26 are openable and closable in directions close to each other and in directions away from each other, and are opened and closed by operating clamp cylinders 27 provided on the base end sides of each other. As shown in FIGS. 5 and 6, the wrap film 11 supplied to the grip portions 25 a and 26 a that grip the pin portion 2 or the journal portion 4 is attached to the first arm 25 and the second arm 26. Alternatively, a shoe 28 for pressing against the journal unit 4 is detachably attached.

  A plurality of such shoes 28 are arranged at predetermined intervals on the gripping portion 25a of the first arm 25 and the gripping portion 26a of the second arm 26 in order to uniformly polish the entire peripheral surface of the pin portion 2 or the journal portion 4. ing. When the pin portion width WP or the journal portion width WJ differs depending on the type of the crankshaft 1, the shoe 28 has a plurality of types prepared for each type and the pin portion width WP of the crankshaft 1 to be polished. Alternatively, it can be replaced with one corresponding to the journal width WJ. For example, when the journal part 4 having a wide journal part width WJ is polished, the shoe 28 is replaced with a shoe 28 having a width substantially the same as the journal part width WJ.

  Even if the width of the first arm 25 or the second arm 26 to which the shoe 28 is attached is smaller than the width of the shoe 28, there is no problem in polishing. Therefore, the minimum pin portion width WP or the minimum The journal width WJ.

  The first arm 25 and the second arm 26 polish the pin portion 2 because the pin portion 2 rotates around the journal portion 4 when the crankshaft 1 is rotated around the journal portion 4. Sometimes, these arms 25 and 26 are also connected by the first link member 29 and the second link member 30 so that they can move together with the pin portion 2.

  In addition, the clamp polishing portion 15 including the first arm 25 and the second arm 26 as a set is different from the pin portion 2 or the journal portion width WJ when the pin portion width WP or the journal portion width WJ of the crankshaft 1 to be polished is different. Each position can be moved to a position corresponding to the journal unit 4. As shown in FIGS. 7 and 8, the pitch adjusting means (clamp polishing unit feed mechanism) for changing the arrangement pitch of each clamp polishing unit 15 is connected to the clamp polishing unit 15 and the servo motor 31 for feeding the clamp polishing unit. A ball screw 32 that is screwed into the end portion of the second link member 30 and rotated by the clamp polishing portion feeding servo motor 31 to feed the clamp polishing portion 15 in the longitudinal direction of the crankshaft 1 is formed.

  Each clamp polishing unit 15 is operated by an instruction from the clamp polishing unit movement control unit 33 based on workpiece information such as the pin portion width WP or the journal unit width WJ of the crankshaft 1 detected by the workpiece detection unit 17. The feed servomotor 31 is driven and controlled to move to a predetermined position corresponding to the pin portion 2 or the journal portion 4. The clamp polishing unit movement control unit 33 moves the clamp polishing unit feed servo motor 31 based on the workpiece information and rotates the ball screw 32 to fix the clamp polishing unit 15 to the pin portion 2 or journal of the crankshaft 1 to be polished. Move to just above part 4.

  As shown in FIG. 2, the film collection unit 16 collects the lapped film 11 after being wound around the peripheral surface of the roller. By providing the film collection unit 16, the used wrap film 11 can be properly arranged without being scattered.

  The workpiece detection unit 17 detects at least the width of the pin portion 2 or the journal portion 4 of the crankshaft 1 to be polished before polishing, and sends the detected information to the main processing control unit 24. The workpiece information includes information such as the total length of the crankshaft 1, dimension information (such as the pin portion width WP and the journal portion width WJ), and the lot number.

  A plurality of guide rollers 34 are disposed on the travel path of the wrap film 11 in the polishing apparatus 10.

"Polishing method"
Next, a method for polishing the pin portion 2 or the journal portion 4 of the crankshaft 1 using the polishing apparatus 10 configured as described above will be described.

  First, the crankshaft 1 to be polished is set in the polishing portion of the polishing apparatus 10 of the present embodiment. Then, before the polishing process, the workpiece information of the input crankshaft 1 is read by the workpiece detector 17. The workpiece information read by the workpiece detection unit 17 is sent to the main machining control unit 24 and then sent to each of the cutter movement control unit 23 and the clamp polishing unit movement control unit 33.

  In the main processing control unit 24, the operator confirms the pin portion width WP of the pin portion 2 to be polished or the journal portion width WJ of the journal portion 4 from the obtained workpiece information on a monitor or the like, and the pin portion width WP or A shoe 28 matching the journal width WJ is attached to the gripping portions 25 a and 26 a of the first arm 25 and the second arm 26.

  The cutter movement control unit 23 drives the cutter driving servo motor 20 based on the workpiece information to rotate the ball screw 21, and moves the cutter mounting member 22 screwed into the ball screw 21 in the width direction of the wrap film 11. The cutter 18 is moved to a position where the wrap film 11 is cut to the pin width WP or the journal width WJ of the crankshaft 1 to be polished.

  Then, the wrap film 11 supplied from the film supply unit 12 is lightly gripped from the thickness direction by the film holding unit 19, tension is applied to the wrap film 11, and the cutter 18 is pressed against the wrap film 11. Then, the wrap film 11 is cut into substantially the same width as the pin portion width WP or the journal portion width WJ to be polished by the cutter 18.

  The cut unnecessary wrap film 11 is sent to the unnecessary film take-up section 14 where it is taken up.

  On the other hand, the clamp polishing unit movement control unit 33 drives the clamp polishing unit feeding servo motor 31 based on the workpiece information to rotate the ball screw 32, and moves each clamp polishing unit 15 in the longitudinal direction of the crankshaft 1, It moves to each position corresponding to the pin part 2 or journal part 4 of the crankshaft 1 to be polished. Each clamp polishing portion 15 can be moved by the respective clamp polishing portion feeding servo motor 31 and ball screw 32, so that a plurality of types of crankshafts 1 having different pin portion widths WP or journal portion widths WJ can also be moved to their respective positions. Therefore, it is possible to polish with the same polishing apparatus 10.

  When the polishing position of each clamp polishing portion 15 is determined, the first arm is operated by operating the clamp cylinder 27 on the wrap film 11 sent along the gripping portions 25a and 26a of the respective clamp polishing portions 15. 25 and the second arm 26 are closed and pressed against the pin part 2 or the journal part 4.

  Next, the crankshaft 1 is rotated around the journal portion 4. Then, the surface of the pin part 2 or the journal part 4 is grind | polished by the relative rotational motion of the wrap film 11 and the crankshaft 1 which are sequentially sent at a predetermined speed. The lapped film 11 after polishing is sent to the film collecting unit 16 and wound up.

  When the pin portion 2 is polished, the clamp polishing portion 15 is rotated along with the pin portion 2 while the pin portion 2 is polished. When the journal portion 4 is polished, the clamp polishing portion 15 is The journal part 4 is polished in a stopped state without rotating around.

  When the polishing is completed and the next crankshaft 1 is inserted, the workpiece information of the crankshaft 1 is read by the workpiece detector 17 as described above. Then, after replacing the shoe 28 based on the workpiece information, the wrap film 11 is cut to the pin portion width WP or the journal portion width WJ of the crankshaft 1 to be polished next based on the workpiece information. Similarly, each clamp polishing portion 15 is also moved to a position corresponding to each pin portion 2 or journal portion 4 based on the workpiece information. When all the preparations are completed, the pin portion 2 or the journal portion 4 is polished while rotating the crankshaft 1.

"Action / Effect"
According to this embodiment, since the film cut portion 13 for cutting the wrap film 11 in accordance with the width of the pin portion 2 or the journal portion 4 of the crankshaft 1 is provided, if one kind of wrap film 11 is prepared, the pin Several types of crankshafts 1 having different part widths WP or journal part widths WJ can be polished. Accordingly, the type of the wrap film 11 that has been prepared for each pin width WP or journal width WJ can be reduced to one, and the number of steps for replacing the wrap film 11 can be greatly reduced. .

  In addition, according to the present embodiment, since the shoes 28 attached to the grip portions 25a, 26a of the first arm 25 and the second arm 26 are made detachable, the crankshafts having different pin portion widths WP or journal portion widths WJ. Even when 1 is polished, it is possible to polish several types of crankshafts 1 with the same polishing apparatus 10 as long as the shoe 28 corresponding to the width is replaced.

  In addition, according to the present embodiment, since the workpiece detection unit 17 that detects at least the workpiece information of the crankshaft 1 to be polished is provided before the polishing process, the lap film 11 is polished based on the detected workpiece information. It can be cut into the pin portion width WP or the journal portion width WJ of the power crankshaft 1, and each clamp polishing portion 15 can be arranged in each pin portion 2 or journal portion 4. As a result, it is possible to save time and effort for preparing several types of wrap films 11 that differ depending on the setup time and width in the previous stage of polishing the crankshaft 1 put into the polishing apparatus 10.

  Moreover, according to this Embodiment, since the unnecessary film winding-up part 14 which winds up the cut unnecessary wrap film 11 is provided, it can arrange neatly without scattering the cut unnecessary wrap film 11, and a processing site Can contribute to a clean environment.

  In addition, according to the present embodiment, since the pitch adjusting means (clamp polishing part feeding mechanism part) for changing the arrangement pitch of each clamp polishing part 15 is provided, several types of cranks having different pin part widths WP or journal part widths WJ are provided. The setup work for polishing the shaft 1 can be greatly reduced, and there is no need to prepare a dedicated polishing apparatus 10 for each different pin width WP or journal width WJ as in the prior art.

"Other embodiments"
Although specific embodiments to which the present invention is applied have been described above, the present invention is not limited to these embodiments, and various other embodiments can be adopted without departing from the gist of the present invention.

  In FIG. 1, the polishing apparatus 10 according to the present invention has been described taking the crankshaft 1 for a four-cylinder engine as an example, but the pin portion 2 or the journal portion 4 of the crankshaft 1 for a six-cylinder engine is also used. Can be polished by the polishing apparatus 10 of the present embodiment.

It is a top view of a crankshaft. It is a schematic block diagram which shows the grinding | polishing apparatus of a crankshaft. It is a block diagram of the grinding | polishing apparatus of a crankshaft. It is a principal part expansion perspective view which shows a film cut means. It is a principal part enlarged side view which expands and shows a grinding | polishing process part. It is a principal part enlarged front view which expands and shows a grinding | polishing process part. It is a principal part expansion perspective view which shows an example of the pitch adjustment means to vary the arrangement | sequence pitch of a clamp means. It is a principal part enlarged plan view of the pitch adjustment means which varies the arrangement pitch of a clamp means.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Crankshaft 2 ... Pin part 4 ... Journal part 10 ... Polishing apparatus 11 ... Lap film 12 ... Film supply part (film supply means)
13 ... Film cut part (film cut means)
14 ... Unnecessary film winding part (film winding means)
15 ... Clamp polishing part (clamp polishing means)
16 ... Film collection unit 17 ... Work detection unit (work information detection means)
DESCRIPTION OF SYMBOLS 18 ... Cutter 23 ... Cutter movement control part 24 ... Main process control part 25 ... 1st arm 26 ... 2nd arm 31 ... Servo motor for clamp grinding | polishing part feeding (pitch adjustment means)
32 ... Ball screw (pitch adjusting means)
33 ... Clamp polishing part movement control part

Claims (7)

Film supply means for sequentially feeding out the wrap film;
Film cut means for cutting the wrap film fed from the film supply means according to the width of the pin part or journal part of the crankshaft;
The pin portion or journal portion of the crankshaft is clamped together with the wrap film cut to the pin portion width or the journal portion width, and at least the crankshaft and the wrap film are relatively rotated to polish the pin portion or the journal portion. A crankshaft polishing apparatus comprising: a clamp polishing means comprising one arm and a second arm. The crankshaft polishing apparatus according to claim 1,
The first arm and the second arm are detachably provided with a shoe for pressing the wrap film sent along the gripping portion to the gripping portion that grips the pin portion or the journal portion against the pin portion or the journal portion. A crankshaft polishing apparatus characterized by that. The crankshaft polishing apparatus according to claim 1 or 2,
Crankshaft comprising: workpiece information detecting means for detecting at least a width of a pin portion or a journal portion of a crankshaft to be polished before polishing and sending the detected workpiece information to the film cutting means. Polishing equipment. The crankshaft polishing apparatus according to claim 3,
The film cut means cuts the wrap film into the pin width or journal width of the crankshaft to be polished based on the work information detected by the work information detection means. apparatus. A grinding apparatus for a crankshaft according to any one of claims 1 to 4, comprising:
A crankshaft polishing apparatus comprising film take-up means for taking up the cut unnecessary wrap film. A crankshaft polishing apparatus according to any one of claims 1 to 5, comprising:
A crankshaft polishing apparatus comprising pitch adjusting means for changing an arrangement pitch of each clamp polishing means for clamping the pin portion or the journal portion. The crankshaft polishing apparatus according to claim 6,
The crankshaft polishing apparatus, wherein the pitch adjusting means varies the arrangement pitch of the clamp polishing means based on the workpiece information detected by the workpiece information detecting means.

Images