JP5283344B2 - Simultaneous super finishing machine for double row rolling surface - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a super-finishing device finishing, with a high accuracy, double-row rolling surfaces which serves as track surfaces of double-row bearings. <P>SOLUTION: This invention relates to the device 1 performing super-finishing to the double-row rolling surfaces Wa, Wb simultaneously relative to a workpiece W with the double-row rolling surfaces Wa, Wb with arc cross sections becoming the track surfaces of the double-row bearings. The device is provided with a spindle stand device 2 rotating the workpiece W around its central axis L, and two grinding wheel oscillating stand devices 3, 4. The respective grinding wheel oscillating stand devices 3, 4 presses grinding wheels 5, 6 against one WA of and other Wb of the rolling surfaces Wa, Wb of the workpiece W in a rotating condition while being supported by the spindle stand device 2. The grinding wheels 5, 6 are oscillated around arc centers e, f in the cross sections of the pressed rolling surfaces Wa, Wb. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to an apparatus that simultaneously superfinishes two rows of rolling surfaces that form raceways of a double row bearing.

As an apparatus for superfinishing the rolling surface (track surface) of the bearing, the apparatuses disclosed in FIGS. 9 and 10 of Patent Document 1 and Patent Document 2 are exemplified. These super-finishing machines press a grindstone against a machining target part of a workpiece supported rotatably around a central axis on a main shaft, and swing this grindstone around a horizontal axis perpendicular to the axis of the main shaft. It is to cut. In Patent Document 1 and Patent Document 2, there is no particular mention of superfinishing two rows of rolling surfaces. However, with these superfinishing devices, a workpiece having two rows of arc-shaped cross sections. In the case of super-finishing, the grindstone supported so as to be swingable is placed and pressed at one of the rolling surface machining positions while rotating the shaft while supporting the workpiece on the main shaft and swinging around the horizontal axis. Then, super-finishing of one rolling surface is performed by rotation around the central axis of the workpiece along with the rotation of the main shaft. Next, the workpiece or the grindstone is transported and moved along the direction of the central axis of the workpiece, and the grindstone supported so as to be swingable is disposed at the other rolling surface processing position and pressed and swung. By rotating the workpiece around the central axis, the other rolling surface is similarly superfinished.
Japanese Patent Laid-Open No. 58-11485 JP 2006-142446 A

  When superfinishing two rows of rolling surfaces with the superfinishing apparatus as described above, after processing one rolling surface, the workpiece or the grindstone is moved along the central axis direction of the workpiece. Since it moves and processes the other rolling surface, work efficiency is bad. In addition, since a series of super finishing processes involve movement between the rolling surface machining positions of the workpiece or the grindstone, the positioning accuracy of the grindstone with respect to each rolling surface machining position becomes a problem. A highly accurate moving mechanism is required.

  An object of the present invention is to provide a machining apparatus capable of superfinishing two rows of rolling surfaces, which are raceway surfaces of a double row bearing, simultaneously and accurately.

The simultaneous super-finishing apparatus for double row rolling surfaces of the present invention is the above-mentioned for an annular work piece having two rows of arc-shaped cross-sectional rolling surfaces as raceway surfaces of the double row bearing on the inner surface. an apparatus for superfinishing simultaneously two rows of raceway surfaces, comprising the a headstock device for rotating the workpiece around the central axis of its support in the main shaft, and two of the wheel swing table device Each of these grindstone oscillating table devices is supported by the headstock device, and grindstones are respectively applied to one rolling surface and the other rolling surface of the two rows of rolling surfaces of the workpiece in rotation. The grindstone is swung around the center of the arc of the cross section of the pressed rolling surface, and the two grindstone rocking table devices are respectively swingably supported by the rocking support table. A swing unit that is driven to swing by a dynamic drive source, and each swing unit includes the swing drive source A swing arm provided on the output shaft, and a swing head supported by the swing arm, each swing head being connected to the workpiece supported by the headstock device. Each of the grindstones is inserted into the space on the inner peripheral side, and the rocking arm and the rocking head respectively give rocking about the axis perpendicular to the rotation center of the workpiece .

  According to this configuration, the workpiece is supported by the headstock device so as to be rotatable around its central axis. Then, the two grindstone rocking table devices are operated simultaneously, and the two rows of rolling surfaces are simultaneously machined by pressing the respective grindstones against the two rows of rolling surfaces of the workpiece being rotated. At this time, in a state where the two grindstones are pressed against the two rows of rolling surfaces, each grindstone is swung around the arc center of the cross section of the rolling surface, so that each grindstone has a predetermined arc shape on the rolling surface. The super-finish grinding of the two rows of rolling surfaces is simultaneously performed with high accuracy.

In the present invention, before KiYura dynamic head, a grinding wheel held on the grindstone holder may as having a grindstone pressing mechanism presses the rolling run surface through the grinding pressure rod by pressure cylinder.
If the two grindstone rocking table devices are configured in this way, each of them has a rocking head that is rockably supported by the rocking support table and is rocked forward and backward by a rocking drive source. By simultaneously operating two grindstone rocking table devices, two rows of rolling surfaces can be simultaneously superfinished. In addition, if any of these is operated alone, super-finishing of the rolling surface of the single row bearing can be performed, and various super-finishing can be performed according to the type of workpiece. .

The swing head before Symbol two grinding swing table apparatus for a given symmetry reference plane including the rotation center axis of the workpiece by the headstock unit, and arranged substantially symmetrical positions, each swing The head is configured to press the grindstones against the two rows of rolling surfaces while being offset from the rotation center axis of the workpiece. If the oscillating head is arranged in a substantially symmetrical position with respect to a predetermined symmetry reference plane including the rotation center axis of the workpiece in this way, the layout configuration of the apparatus is made compact and pressed against each rolling surface. When the grindstone is swung around the center of the arc of the cross section of each rolling surface, simultaneous super-finishing of the double row rolling surface can be performed without hindrance without interfering with each other.

The simultaneous super-finishing apparatus for double row rolling surfaces of the present invention is the above-mentioned for an annular work piece having two rows of arc-shaped cross-sectional rolling surfaces as raceway surfaces of the double row bearing on the inner surface. An apparatus for simultaneously superfinishing two rows of rolling surfaces, comprising: a spindle base device that supports the workpiece by a spindle and rotates it around its central axis; and two grindstone rocking table devices, Each of these grindstone oscillating table devices presses the grindstone against one rolling surface and the other rolling surface of two rows of rolling surfaces of the workpiece being supported and rotated by the headstock device. The grindstone is swung around the center of the arc of the cross section of the pressed rolling surface, and the two grindstone rocking table devices are swingably supported by the rocking support table, respectively. A swing unit that is swingably driven by a drive source, and each swing unit is A swing arm provided on the output shaft, and a swing head supported by the swing arm, each swing head being connected to the workpiece supported by the headstock device. inserting them into the inner peripheral side of the space, between these swing arm and the swing head is shall give each oscillating about an axis perpendicular to the rotation center of the workpiece in each grinding wheel, the Each of the two grindstone rocking table devices includes the rocking head that is rockably supported by the rocking support table and is rocked forward and backward by the rocking drive source. The oscillating head of the oscillating table device is disposed at a substantially symmetrical position with respect to a predetermined symmetry reference plane including the rotation center axis of the workpiece by the spindle table device, Each grindstone is offset from the rotation center axis of the workpiece, Because we assumed that presses the rolling run side column, superfinishing of rolling run surfaces of the two rows is performed at the same time, the efficiency of processing operations can be achieved. Also, as in the case of processing two rows of rolling surfaces individually, after processing one of the rolling surfaces, the work piece or grindstone is moved and moved to the other rolling surface processing position. A high-precision positioning accuracy and high-precision workpiece or grindstone movement control mechanism associated with this movement in the work and the machining work process are also unnecessary.

  An embodiment of the simultaneous superfinishing apparatus for a double row rolling surface according to the present invention will be described with reference to FIGS. The superfinishing apparatus 1 includes a spindle base device 2 that rotates a workpiece (outer ring of a double-row bearing that is a bearing for an automobile wheel in the drawing) around a central axis L, and two grindstone rocking table devices. 3 and 4 are provided. The headstock device 2 includes a main shaft motor 2a, a main shaft 2b directly connected to the output shaft of the main shaft motor 2a, and a backing plate 2c attached to the tip of the main shaft 2b. The backing plate 2c holds the workpiece by a pressure roll, and rotates the workpiece W around the central axis L by the rotation of the main shaft 2b. During this rotation, the workpiece W is held in a state in which it cannot be displaced in the axial direction and the radial direction by a shoe or a pressure roll (not shown).

  The two grindstone rocking table devices 3 and 4 are swingably supported on rocking support tables 30 and 40, respectively, and are driven to rock in the forward and reverse directions by rocking drive sources such as rocking motors 31 and 41. The oscillating units 32 and 42 are provided. The swing support tables 30 and 40 are installed on the advance / retreat tables 30a and 40a that move back and forth in the direction parallel to the central axis L (see arrows a and b in FIG. 1). The advance / retreat bases 30a, 40a are moved forward and backward in the directions of arrows a, b on the guide bases 30d, 40d using the rail guides 30b, 40b by driving by the pneumatic cylinders 30c, 40c.

  The oscillating units 32 and 42 are supported by oscillating arms 33 and 43 fixed to the output shafts 31a and 41a of the oscillating motors 31 and 41, and the oscillating arms 33 and 43 so as to be movable up and down. The oscillating heads 34 and 44 and the elevating mechanisms 35 and 45 for moving the oscillating heads 34 and 44 up and down are configured.

  As shown in FIG. 2, the swing arms 33 and 43 are provided in a U-shaped frame shape in a side view. The elevating mechanisms 35 and 45 are installed on the retraction cylinders 35a and 45a installed on the upper frame pieces 33a and 43a of the swing arms 33 and 43, and the telescopic rods 35b and 45b of the retraction cylinders 35a and 45a. Lifted bodies 35c, 45c and two parallel guide rods 35d provided between the upper and lower frame pieces 33a, 43a, 33b, 43b of the swing arms 33, 43 for guiding the lifts 35c, 45c. 45d. The swing arms 33 and 43 are fixed to the tips of the output shafts 31a and 41a of the swing motors 31 and 41 through the vertical frame pieces 33c and 43c.

The oscillating heads 34 and 44 have a substantially L shape in plan view, and have a predetermined symmetrical reference plane (between the oscillating arms 33 and 43 including the rotation center axis L of the workpiece W by the head stock device 2. Each of the bases is arranged so as to be arranged at a substantially symmetrical position with respect to a plane longitudinally cutting the airspace along the rotation center axis L, that is, a plane perpendicular to the paper surface of FIG. It is fixed to 35c and 45c. The oscillating heads 34 and 44 connect the grindstone holders 36 and 46 and the grindstones 5 and 6 held by the grindstone holders 36 and 46 to the pressurizing cylinders 37a and 47a via the grindstone pressure rods 37b and 47b. And a grindstone pressing mechanism 37, 47 that presses against the rolling surface. The grindstone pressure rods 37b and 47b extend from the pressure cylinders 37a and 47a toward the workpiece W along the rotation center axis L, and the grindstone is applied to the inner surface of the workpiece W by the pressure cylinders 37a and 47a. 5 and 6 are configured such that a radial pressing force acts on them. The shaft centers c and d of the output shafts 31a and 41a of the swing motors 31 and 41 are connected to the headstock device 2 when the swing units 32 and 42 are installed at predetermined processing positions by the operation of the advance / retreat bases 30a and 40a. Are aligned with arc centers e and f (see FIG. 3) of the rolling surfaces Wa and Wb having two rows of arc-shaped cross-sections of the workpieces W held on the surface.
In FIG. 3, the constituent parts on the swing unit 42 side do not appear in the drawing, and for convenience of explanation, the constituent parts on the swing unit 42 side are parenthesized corresponding to the constituent parts on the swing unit 32 side. It is attached with a sign.

  The point of superfinishing the workpiece W having the rolling surfaces Wa and Wb having two rows of arc-shaped cross sections by the superfinishing apparatus 1 having the above configuration will be described. The workpiece W on which the rolling surfaces Wa and Wb have been turned and ground is held concentrically with the spindle 2b by the backing plate 2c of the spindle head device 2. At this time, the axial displacement and the radial displacement of the workpiece W are made impossible by a shoe or a pressure roll (not shown). Next, the advancing / retreating bases 30a, 40a at the standby position are moved forward by the shaft rotation of the feed screws 30b, 40b accompanying the rotational drive of the advancing / retreating motors 30c, 40c, and the swing units 32, 42 are moved to the headstock device 2 side. Move to. As a result, the grindstone holders 36 and 46 are inserted into the ring of the workpiece W and positioned at the machining preparation position (see the two-dot chain line position in FIG. 2). In the positioning, the distance between the shaft centers c and d of the output shafts 31a and 41a of the swing motors 31 and 41 is equal to the span of the rolling surfaces Wa and Wb, and the shaft centers c and d are aligned with the rolling surfaces Wa and Wb. It is made to coincide with the upper position of the arc centers e and f.

  In this state, the retraction cylinders 35a and 45a of the elevating mechanisms 35 and 45 are operated to lower the rocking heads 34 and 44 relative to the rocking arms 33 and 43, and the grindstones 5 and 6 are moved to the respective rolling surfaces. It abuts on Wa and Wb. At the same time, the pressurizing cylinders 37a and 47a are operated to press the grindstones 5 and 6 against the rolling surfaces Wa and Wb via the grindstone pressurizing rods 37b and 47b. While maintaining this pressing state, the spindle 2b of the headstock device 2 is rotated, the swing motors 31 and 41 are further operated, and the output shafts 31a and 41a of the swing motors 31 and 41 are driven by forward and reverse rotation. By means of forward / reverse rotational swinging about the axes c and d (see arrows g and h in FIGS. 1 to 3), the grindstones 5 and 6 together with the swinging units 32 and 42 have arc centers e and w of the rolling surfaces Wa and Wb. By swinging around f, the superfinishing of the rolling surfaces Wa and Wb is performed. The processing surfaces of the grindstones 5 and 6 have the same arc shape as the cross-sectional shape of the rolling surfaces Wa and Wb, and the center of curvature of the grinding surfaces 5 and 6 is in contact with and pressed against the rolling surfaces Wa and Wb. That is, it is formed so as to coincide with the arc centers e and f of the rolling surfaces Wa and Wb. If the intervals between the shaft centers c and d of the output shafts 31a and 41a of the swing motors 31 and 41 are initially set, positioning is set each time the same type of workpiece W is processed. Can be continuously processed.

  4 (A) and 4 (B) show the procedure of the above processing, the solid line portion in the figure indicates the swing head (swing unit 32) 34, and the two-dot chain line portion indicates the swing head (swing unit 42). ) 44 respectively. The illustrations of the lifting mechanisms 35 and 45 are omitted. 4A shows that the swinging units 32 and 42 are in the upper position due to the rotation of the swinging motors 31 and 41, and FIG. 4B shows that the swinging units 32 and 42 are in the lower position. . Thus, the grindstones 5 and 6 rotate around the rotation center axis L by the rocking units 32 and 42 repeating rocking rotation around the axes c and d of the output shafts 31a and 41a. Since the grindstones 5 and 6 are pressed against the rolling surfaces Wa and Wb by the grindstone pressing mechanisms 37 and 47 during this time, acting on the rolling surfaces Wa and Wb of the workpiece W, super finishing of the rolling surfaces Wa and Wb is performed. Processing is simultaneously performed with high accuracy.

  When the predetermined superfinishing is completed, the rotation of the spindle motor 2b of the headstock device 2 is stopped, and at the same time, the pressing of the grindstones 5 and 6 by the grindstone pressing mechanisms 37 and 47 is released and the swinging by the swinging motors 31 and 41 To stop. Thereafter, the oscillating heads 34 and 44 are raised by the elevating mechanisms 35 and 45 to release the grindstones 5 and 6 from the inner surface of the workpiece W. Further, the advancing / retreating motors 30c, 40c are operated to retract the swing units 32, 42 to their original standby positions. Meanwhile, the finished workpiece W held on the backing plate 2c of the head stock device 2 is replaced with an unfinished workpiece W to prepare for the next superfinishing work. By repeating these operations, simultaneous super-finishing of the two rolling surfaces Wa and Wb in the workpiece W having the rolling surfaces Wa and Wb having two rows of arcuate cross-sections which are the races of the double row bearing is sequentially performed. Made.

The two grindstone rocking table devices 3 and 4 are configured such that each operation mechanism can individually operate, so that the rolling surfaces Wa and Wb can be individually superfinished. It is. Further, in the case of a work piece having an arc-shaped cross section which becomes a raceway surface of a single row bearing, the rolling operation can be performed by operating in the same manner as described above with one of the grindstone rocking table devices 3 and 4 stopped. Superfinishing of the surface can be performed. Furthermore, rolling surface in the above embodiment, the workpiece W is described the case a bearing outer race may be an axial受内wheels as a reference Proposed Example, in this case formed in the inner ring outer diametric surface The above-described grindstones 5 and 6 can be brought into contact with each other to perform the superfinishing process similar to the above. As described above, the processing apparatus of the present invention can efficiently and accurately perform superfinishing of the rolling surface according to various specifications of the workpiece.

It is a schematic plan view which shows one Embodiment of the simultaneous super-finishing processing apparatus of the double row rolling surface of this invention. FIG. 2 is a partially enlarged plan view of FIG. 1. FIG. 3 is a side view taken along the line III-III of the swing unit in FIG. 1. (A), (B) is a schematic side view which shows the operation state of the rocking | swiveling unit of this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Simultaneous super finishing machine 2 ... Spindle head device 3, 4 ... Grinding wheel rocking table device 30, 40 ... Swing support table 31, 41 ... Swing motor (oscillation drive source)
33, 43 ... Oscillating heads 36, 46 ... Whetstone holders 37, 47 ... Whetstone pressing mechanisms 37a, 47a ... Pressure cylinders 37b, 47b ... Whetstone pressurizing rods 5, 6 ... Whetstone L ... Center axis e of the workpiece , F ... arc center of cross section of rolling surface W ... work piece Wa, Wb ... rolling surface

Claims (2)

An apparatus for simultaneously superfinishing the above-mentioned two rows of rolling surfaces with respect to an annular work piece having two rows of arc-shaped cross-section rolling surfaces which serve as raceway surfaces of the double row bearing on the inner diameter surface. ,
A spindle stock device that supports the workpiece by a spindle and rotates it around its central axis, and two grindstone rocking table devices, each of which is supported by the spindle stock device. The grindstone is pressed against one of the two rolling surfaces of the workpiece in rotation and the other rolling surface, and the grindstone is placed around the center of the arc of the cross section of the pressed rolling surface. The two grindstone rocking table devices each have a rocking unit that is rockably supported by a rocking support table and is driven to rock by a rocking drive source. The moving unit has a swing arm provided on the output shaft of the swing drive source, and a swing head supported by the swing arm, and with respect to the workpiece supported by the headstock device, Each of the oscillating heads is inserted into a space on the inner peripheral side of the workpiece, and these oscillating heads are inserted. In the arm and swinging the head, a shall give each oscillating about an axis perpendicular to the rotation center of the workpiece in each grinding stone, said two grinding swing table apparatus, respectively, said rocking A rocking head supported in a rocking manner by a rocking drive source and driven to rock in the forward and reverse directions by the rocking drive source, and the rocking heads of the two grindstone rocking table devices are connected to the main shaft. With respect to a predetermined symmetry reference plane including the rotation center axis of the workpiece by the platform device, the rocking heads are arranged so that the respective grindstones are moved from the rotation center axis of the workpiece. A simultaneous super-finishing machine for double row rolling surfaces that is offset and pressed against the two rows of rolling surfaces. According to claim 1, before KiYura dynamic head, a grinding wheel held on the grindstone holder and has a grindstone pressing mechanism presses the rolling run surface through the grinding pressure rod by pressure cylinder Fukuretsutenhashi Simultaneous super-finishing machine for surfaces.

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