JPH0451971Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a surface grinding device for grinding a flat surface of a workpiece using a rotating grindstone.

(Prior Art) A surface grinding device for grinding a flat part of a workpiece is usually used, for example, in Japanese Patent Application Laid-Open No. 57-149147.
As described in the above publication, it has a rotary table rotatably disposed on the bed and a grindstone holding means for rotatably holding the grindstone. In such a surface grinding device, a rotating grindstone is brought into contact with a flat surface of a workpiece that is gripped and rotated by a chuck or the like provided on a rotary table, and the flat surface of the workpiece is ground. It will be done. The grindstone holding means is supported so as to be movable in the direction along the rotation center axis of the rotary table, so that the amount of feed of the grindstone to the workpiece mounted on the rotary table can be arbitrarily set. has been done.

When grinding a workpiece using a surface grinding device configured as described above, generally, rough grinding is first performed on the workpiece mounted on a rotary table. After the rough grinding is completed, finish grinding, spark out, etc. are performed. The amount of feed of the grindstone relative to the workpiece in each of these steps is different, and the amount of feed of the grindstone during rough grinding is usually the largest.

(Problem to be solved by the invention) By the way, when a workpiece is ground by a surface grinding device, by making a rotating grindstone perform reciprocating motion in a direction perpendicular to the rotation center axis of a rotary table, , is known to improve the finishing accuracy of the ground surface of the workpiece. In order to cause the rotating grindstone to reciprocate in a direction perpendicular to the central axis of rotation of the rotary table, a structure is generally adopted in which the grindstone holding means is attached to the bed via a roller or the like.

However, as described above, the surface grinding device in which the grinding wheel holding means is movably attached to the bed and is reciprocated in a direction perpendicular to the rotation center axis of the rotary table is used to remove the workpiece. In particular, when grinding is carried out on
During rough grinding in which the amount of feed of the grindstone relative to the workpiece is large, the attachment strength of the grindstone holding means to the bed is insufficient, and there is a risk that the grinding surface of the grindstone may be tilted with respect to the flat surface of the workpiece. Therefore, it is possible to reduce the inclination between the grinding surface of the grinding wheel and the flat surface of the workpiece by reducing the amount of feed per unit time of the grinding wheel during rough grinding, but in that case, There is a disadvantage that the time required for rough grinding increases, and as a result, the time required for grinding the workpiece increases.

In view of these points, the present invention is such that when a rotating workpiece is ground by a grindstone, the grindstone is made to perform reciprocating motion in a direction perpendicular to the rotation center axis of the workpiece. It is an object of the present invention to provide a surface grinding device that can shorten the time required for grinding a workpiece.

(Means for Solving the Problems) In order to achieve the above-mentioned object, a surface grinding device according to the present invention includes a rotary table rotatably disposed on a bed, to which a workpiece is attached, and a grinding device for grinding the workpiece. a grindstone holding means for rotatably holding a grindstone for performing the grinding process; a movable platform for movably supporting the
a movable base driving means for causing the movable base to reciprocate in a direction perpendicular to the rotation center axis of the rotary table; a first state provided in association with the movable base and fixing the movable base to the bed; It is configured to include a clamping means that selectively takes a second state in which the table is movable relative to the bed, and a control means, and the control means performs at least rough grinding of the workpiece with a grindstone. When the clamping means takes the first state and the operation of the movable table driving means is stopped, and when the grindstone performs the final grinding of the workpiece, the clamping means takes the second state.
This state is assumed, and the moving table driving means is activated.

(Function) In the surface grinding apparatus according to the present invention configured as described above, the grinding wheel held by the grinding wheel holding means and rotated is attached to the flat surface of the workpiece which is mounted on the rotary table and rotated. During grinding, at least during rough grinding, the control means stops the operation of the movable table drive means, and the movable table is fixed to the bed by the clamp means, and the grinding wheel is not applied. Grinding is performed on the flat surface of the workpiece.
Further, after rough grinding is completed, the state in which the movable table is fixed to the bed by the clamp means is released, and the movable table drive means is activated by the control means, so that the movable table is moved to the grindstone holding means. The rotary table is reciprocated in a direction perpendicular to the rotational axis of the rotary table, and in this state, the grindstone grinds the flat surface of the workpiece.

By doing this, the attachment strength of the grindstone holding means to the bed during rough grinding is increased, so that a situation where the grinding surface of the grindstone is tilted with respect to the flat surface of the workpiece during rough grinding can be avoided. Ru. Therefore, the amount of feed of the grindstone relative to the workpiece per unit time can be increased, reducing the time spent on rough grinding, and as a result, reducing the time required for grinding the workpiece. .

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 schematically shows the overall configuration of an example of a surface grinding device according to the present invention.

In FIG. 1, a rotary table 6 is disposed at a predetermined position on the bed 2, and the upper end of a shaft 4 is fixed to the lower surface of the rotary table 6. The shaft 4 is rotatably supported by a support member 8 fitted to the bed 2, and a gear 10 is fixed to the lower end of the shaft 4. The gear 10 is meshed with a gear 14 fixed to the output shaft of a table rotation motor 12 fixed inside the bed 2. Therefore, the rotary table 6 is rotated about the axis O (indicated by a dashed line in FIG. 1) by the operation of the table rotation motor 12. The rotary table 6 is provided with a chuck 16, and the workpiece W placed on the rotary table 6 is held by the chuck 16 and rotates together with the rotary table 6.

At a position facing the upper surface of the workpiece W placed on the rotary table 6, a disc-shaped grindstone 18 is fixed to the lower end of a shaft 22 rotatably supported by a grindstone holding member 20. A grindstone rotation motor 24 for rotating a shaft 22 is disposed above the grindstone holding member 20.

One end of an arm member 26 extending in the horizontal direction is fixed to the grindstone holding member 20, and a female thread 30 constituting a screw feeding mechanism 28 is formed at the other end of the arm member 26. The male screw 32 screwed into the female screw 30 is rotatably supported by a support member 34, and a screw feed motor 36 for rotating the male screw 32 is disposed above the support member 34. The screw feeding motor 36 is operated when a control signal Sa is supplied from a control unit 80, which will be described later, and when the control signal Sa takes a predetermined high level and a predetermined low level, the male screw feed motor 36 is operated. The direction of rotation of 32 is changed. The arm member 26 is
As the screw feed motor 36 operates, the female screw 30
By rotating the male screw 32 screwed into the
It is moved up and down along the axis O together with the grindstone holding member 20. In this way, the amount of feed of the grindstone 18 to the workpiece W placed on the rotary table 6 is adjusted.

A fixed base 38 is provided in the bed 2 at a position spaced apart from the rotary table 6. Fixed stand 3
8, there is a slide table 42 which is movable via a plurality of rollers 40 in the direction toward and away from the rotary table 6 (hereinafter referred to as the X direction) as shown by the arrow X in FIG. It is arranged. Guide rails 44 and 46 are provided on the upper surface of the fixed base 38 and the lower surface of the slide table 42 to regulate the movement path of the slide table 42.

A cam drive motor 50 having an eccentric cam 48 fixed to its output shaft is fixed to a side surface of the fixed base 38, and the cam drive motor 50 is operated by being supplied with a control signal Sb from a control unit 80. be activated. The eccentric cam 48 has a protrusion 52 provided at a position above the cam drive motor 50 on the lower surface of the slide table 42.
is engaged with. Therefore, the slide table 42 is rotated by the operation of the cam drive motor 50. The eccentric cam 48 reciprocates in the X direction with a predetermined stroke depending on the amount of eccentricity.

A lower end surface portion of a movable table 54 having a supporting member 34 fixed to its upper end surface portion is fixed to the upper surface portion of the slide table 42 . The end face of the moving table 54 located on the rotary table 6 side is brought into contact with the lower face of the arm member 26 that is raised and lowered by the operation of the screw feed motor 36, and urges the arm member 26 upward. A biasing means 56 is provided. The biasing means 56 always exerts an upward biasing force on the arm member 26, so that the female thread 30 and the male thread 3 constituting the screw feeding mechanism 28
2, and serves to improve the accuracy of the feed amount of the grindstone 18 with respect to the workpiece W.

A clamping means 58 is arranged at a predetermined position on the fixed base 38 to prevent movement of the slide table 42 in the X direction. As shown in FIG. 2, which shows a cross section taken along the - line in FIG. 62, and
The piston rod 66 is fixed to a piston 64 housed in the cylinder 62 and protrudes from the lower end of the cylinder 62. Further, between the cylinder 62 and the piston 64, the piston 64
A coil spring 65 is compressed to bias the . One end of an oil passage 68 is connected to the cylinder 62, and the other end of the oil passage 68 is connected to a solenoid valve 70. solenoid valve 7
0, an oil supply passage 74 whose one end is opened to an oil reservoir 72 and the other end of an oil return passage 75 are connected to the oil supply passage 74, and an oil pump 76 is interposed in the oil supply passage 74. There is.

When the solenoid valve 70 is supplied with the control signal Sv from the control unit 80 to the solenoid 70a,
A valve arrangement is adopted that allows the oil passage 68 and the oil supply passage 74 to communicate with each other and introduces the oil pumped by the oil pump 76 into the cylinder 62.
Further, when the control signal Sv is not supplied, the oil passage 68 and the oil return passage 75 are communicated with each other,
A valve is arranged to return the oil in the cylinder 62 to the oil reservoir 72. The oil pump 76 is activated when a control signal Sp is supplied from the control unit 80, and pumps the oil in the oil reservoir 72 to the oil supply passage 74.

Based on the above-described configuration, when grinding is performed on the upper surface of the workpiece W placed on the rotary table 6 and gripped by the chuck 16, first, the table rotation motor is 12 is activated to rotate the rotary table 6 along with the workpiece W around the axis O, and the grindstone rotation motor 24 is activated to rotate the grindstone 18 in a direction opposite to the direction of rotation of the workpiece W. Rotate to. In such a state, the control unit 80 sends, for example, a high level control signal to the screw feed motor 36.
Supply Sa to activate it. Then, the screw feeding mechanism 28 accompanying the operation of the screw feeding motor 36
By this action, the arm member 26 is lowered along the axis O together with the grindstone holding member 20.

At this time, the feed amount S of the grindstone 18 with respect to the workpiece W is plotted on the vertical axis, and the time T is plotted on the horizontal axis.
As shown in Figure 3, where
First, in a period _T1 , it is rapidly moved by a predetermined amount _S1 so as to come into contact with the upper surface of the workpiece W.

Next, the grindstone 18 brought into contact with the upper surface of the workpiece W is moved from a predetermined amount S ₁ to S ₂ while roughly grinding the upper surface of the workpiece W during a period T ₂ . During a period _T2 during which rough grinding is performed on the upper surface of the workpiece W, the control unit 80 sends a control signal to the oil pump 76 and the solenoid 70a of the solenoid valve 70.
Supply Sp and Sv. As a result, the oil passage 68 and the oil supply passage 74 are brought into communication with each other, and the oil pump 76 is operated, so that the oil pumped by the oil pump 76 flows into the cylinder 62 through the oil supply passage 74 and the oil passage 68. The piston 64 moves downward against the biasing force of the coil spring 65. In this manner, the slide table 42 is pressed toward the fixing base 38 by the lower end of the piston rod 66, thereby fixing the slide table 42 to the bed 2.

After rough grinding of the upper surface of the workpiece W is completed, the grindstone 18 is moved from a predetermined amount S ₂ to S ₃ while performing finish grinding of the upper surface of the workpiece W during a period T ₃ . It will be done. During the period _T3 during which the top surface of the workpiece W is subjected to final grinding, the control unit 80 stops supplying the control signals Sp and Sv to the oil pump 76 and the solenoid 70a of the solenoid valve 70. As a result, the oil passage 68 and the oil return passage 75 are brought into communication, and the operation of the oil pump 76 is stopped, and the cylinder 6
The oil in the piston 2 is returned to the oil reservoir 72 through the oil passage 68 and the oil return passage 75, and the piston 64 is moved upward by the biasing force of the coil spring 65. In this way, the pressure on the slide table 42 by the lower end of the piston rod 66 is released, and in this state, the control unit 80 supplies the control signal Sb to the cam drive motor 50 to operate it. As a result, the eccentric cam 48 rotates, and the slide table 42 reciprocates in the X direction with a predetermined stroke depending on the amount of eccentricity of the eccentric cam 48. Due to the reciprocating movement of the slide table 42, the rotating grindstone 18 is reciprocated in the X direction while grinding the upper surface of the workpiece W, thereby improving the finishing accuracy of the upper surface of the workpiece W. It will be done.

In this way, after finish grinding of the upper surface of the workpiece W is completed, in period _T4 ,
A so-called spark out occurs in which the rotating grindstone 18 continues to move in the X direction while grinding the upper surface of the workpiece W while the feed amount S ₃ of the grindstone 18 to the workpiece W is maintained. will be held. Then, spark-out ends when grinding sparks are no longer generated from the contact surface between the grindstone 18 and the upper surface of the workpiece W.

After the spark-out is completed, the control unit 80 supplies a low-level control signal Sa to the screw feed motor 36. As a result, during the period _T5 , the grindstone 18 is rapidly separated from the upper surface of the workpiece W that has been ground. During such period _T5 , the control unit 80
is the control signal Sb for the cam drive motor 50
At the same time, control signals Sp and Sv are supplied to the oil pump 76 and the solenoid 70a of the solenoid valve 70 to prevent the slide table 42 from moving.
is fixed to bed 2.

In this way, after the grinding of the workpiece W by the grindstone 18 is completed, the table rotation motor 12 and the grindstone rotation motor 24 are stopped, and the workpiece W whose upper surface has been ground is , removed from the chuck 16 of the rotary table 6.

In the series of grinding processes for the workpiece W as described above, when the upper surface of the workpiece W is roughly ground by the grindstone 18, the slide table 42 is moved to the bed 2 by the clamping means 60.
Since the grindstone 18 is fixed to the workpiece W and the mounting strength is increased, a situation where the grindstone 18 is tilted with respect to the upper surface of the workpiece W is avoided, so that the feed rate of the grindstone 18 per unit time during rough grinding is reduced. Therefore, the time required for the rough grinding process (period T ₂ ) can be shortened compared to the conventional method.

(Effects of the invention) As is clear from the above explanation, according to the surface grinding device according to the invention, when the grindstone is used to grind the flat part of the workpiece, the clamping means moves the workpiece during rough grinding. Since the grindstone grinds the flat surface of the workpiece with the table fixed to the bed, it is possible to avoid the situation where the grinding surface of the grindstone tilts with respect to the flat surface of the workpiece during rough grinding. Therefore, the amount of feed of the grindstone per unit time during rough grinding can be increased compared to the conventional method. As a result, the time spent on the rough grinding process is shortened, and as a result, the time required for grinding the flat part of the workpiece can be shortened.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing the overall configuration of an example of a surface grinding device according to the present invention, FIG. 2 is a sectional view taken along the - line in FIG. 1, and FIG. 3 is a diagram showing the example shown in FIG. 2 is a graph showing the relationship between a series of grinding steps performed on a flat surface of a workpiece and the time required for the grinding steps. In the figure, 2 is a bed, 6 is a rotary table, 18 is a grindstone, 20 is a grindstone holding member, 28 is a screw feed mechanism, 36 is a screw feed motor, 42 is a slide table, 48 is an eccentric cam, and 50 is a cam drive. motor, 58 is a clamping means, 62 is a cylinder, 70
76 is a solenoid valve, 76 is an oil pump, and 80 is a control unit.

Claims (1)

[Scope of utility model registration request] A rotary table rotatably disposed on the bed and to which a workpiece is attached; a grindstone holding means rotatably holding a grindstone for grinding the workpiece; a movable base that is movably attached to the bed and supports the grindstone holding means so as to be movable in a direction along the rotational center axis of the rotary table; a first state provided in association with the movable base to fix the movable base relative to the bed; and a first state in which the movable base is fixed relative to the bed; a clamping means selectively taking a second state in which it is movable; and at least when the grindstone performs rough grinding on the workpiece, the clamping means is made to take the first state and the movable stage control means for stopping the operation of the driving means and causing the clamping means to assume the second state and activating the movable table driving means when the grindstone performs finish grinding on the workpiece; A surface grinding device consisting of