JP2012171065A - Curved surface cutting work device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a curved surface cutting work device that can improve working accuracy of a working object by suppressing vibration in cutting work of the working object and reducing the working time.SOLUTION: This curved surface cutting work device 100 includes a worktable 103 and a column 105 on a bed 101 through a bed top plate 102. A cutting tool unit 110 is supported to the column 105 while facing the worktable 103. In the cutting tool unit 110, a first working head 122 and a second working head 132 are supported side by side in the vertical direction as shown in the figure. The first working head 122 and the second working head 132 are operationally controlled by a control device 140, and when one side thereof cuts a working object WK, the other side thereof is reciprocatively displaced in a direction opposite to the reciprocative displacement direction of the one side.

Description

  The present invention relates to a curved surface cutting apparatus for cutting a surface of a workpiece to be curved.

  2. Description of the Related Art Conventionally, there is a curved surface cutting device that cuts the surface of an object to be processed into a curved shape. For example, Patent Documents 1 and 2 below disclose curved surface cutting apparatuses that form an internal combustion engine piston having an elliptical cross-sectional shape by cutting. Each of the curved surface cutting apparatuses described in the following Patent Documents 1 and 2 controls the surface of the workpiece by controlling the cutting amount by the cutting tool in synchronization with the rotation angle of the workpiece to be rotationally driven. Is molded into an elliptical shape.

JP 62-44353 A JP-A-10-94903

  However, in the curved surface cutting apparatuses shown in the above Patent Documents 1 and 2, the cutting tool is reciprocally displaced in the contacting / separating direction in contact with and away from the workpiece in synchronization with the rotation angle of the workpiece. Therefore, there is a problem that the cutting tool and the workpiece are vibrated by the vibration due to the reciprocating displacement and the machining accuracy is lowered. In addition, the vibration generated by the reciprocal displacement of the cutting tool increases with an increase in the number of rotations of the workpiece, which hinders improvement in machining accuracy and shortening of the machining time due to higher rotation of the workpiece. There was also a problem.

  The present invention has been made to cope with the above problems, and its purpose is to improve the processing accuracy of the workpiece and shorten the processing time by suppressing vibrations during the cutting of the workpiece. An object of the present invention is to provide a curved surface cutting apparatus capable of performing the above.

  In order to achieve the above object, a feature of the present invention according to claim 1 is that a machining head for holding a cutting tool for cutting the surface of a workpiece, and a machining head that approaches and separates the workpiece from the workpiece. A machining head displacing means for relatively displacing in the contact / separation direction, and a control means for controlling the operation of the machining head displacing means to cut the workpiece by the cutting tool, the cutting tool being placed on the surface of the workpiece. In the curved surface cutting apparatus that cuts the surface into a curved surface shape by contacting, a reaction body having a predetermined mass, and a reaction body displacement means for displacing the reaction body in the contact and separation direction, the control means, The operation of the reaction body displacing means is controlled to displace the reaction body in the direction opposite to the relative displacement direction of the machining head.

  According to the characteristic of the present invention according to claim 1 configured as described above, the curved surface cutting apparatus has a predetermined mass when the cutting tool is reciprocally displaced in the contact / separation direction in which the cutting tool approaches and separates from the workpiece. The reaction body is configured to reciprocate in a direction opposite to the cutting tool. Thereby, the vibration caused by the reciprocating displacement of the cutting tool is canceled and attenuated by the vibration in the opposite phase to the vibration caused by the reciprocating displacement of the reaction body, that is, the vibration caused by the reciprocating displacement of the cutting tool. As a result, vibration during cutting of the workpiece can be suppressed, and the machining accuracy of the workpiece can be improved and the machining time can be shortened.

  According to another aspect of the present invention according to claim 2, in the curved surface cutting apparatus, the reaction body is a second processing head that holds a second cutting tool for cutting the surface of the workpiece. The control means is to cut the workpiece by the second cutting tool by controlling the operation of the reaction body displacing means.

  According to the other characteristic of the present invention according to claim 2 configured as described above, the curved surface cutting apparatus has a second process in which the reaction body holds the second cutting tool for cutting the surface of the workpiece. It consists of a head. Accordingly, the curved surface cutting apparatus performs the same type, the same type, a different type or a different type of processing on the workpiece while properly using the two cutting tools of the cutting tool and the second cutting tool to the work table of the workpiece. Therefore, machining accuracy and machining efficiency can be improved.

In this case, for example, as shown in claim 3, the cutting tool may be a roughing cutting tool, and the second cutting tool may be a finishing cutting tool. According to this,
A curved cutting device with a cutting tool for roughing a workpiece without changing the cutting tool for roughing and the cutting tool for finishing in a single curved cutting device and for finishing. It is possible to perform processing without changing between the curved surface cutting device provided with the cutting tool, and it is possible to improve processing accuracy and processing efficiency.

  According to a fourth aspect of the present invention, in the curved surface cutting apparatus, the reaction body is disposed adjacent to and parallel to the machining head.

  According to another aspect of the present invention according to claim 4 configured as described above, in the curved surface cutting apparatus, the reaction body is arranged in parallel to the machining head. In this case, the reaction body parallel to the machining head is the positional relationship between the reaction body and the machining head in which the reciprocating displacement direction of the reaction body is parallel to the contact / separation direction which is the reciprocation displacement direction of the machining head. Specifically, it is in a state of being arranged adjacent to the machining head while being displaced in the vertical and horizontal directions. According to this, a curved surface cutting apparatus can be comprised compactly.

  Another feature of the present invention according to claim 5 is that in the curved surface cutting apparatus, the reaction body is disposed on the contact / separation direction line on which the machining head is displaced and is displaced along the contact / separation direction line. There is.

  According to another aspect of the present invention according to claim 5 configured as described above, the curved surface cutting apparatus is arranged so that the reaction body is arranged on the contact / separation direction line which is the displacement direction of the machining head. It is comprised so that it may displace along. In other words, the reaction body is arranged in series with the machining head in the contact / separation direction of the machining head. In this case, the reaction body may be configured with a mass corresponding to the mass of the machining head. According to this, since the reciprocating displacement direction of the machining head and the reciprocating displacement direction of the reaction body are on the same straight line, vibration due to the reciprocating displacement of the machining head can be suppressed with high accuracy.

  According to another aspect of the present invention according to claim 6, in the curved surface cutting apparatus, the work table, the processing head, and the reaction body that hold the workpiece are arranged in a horizontal direction in a front view of the curved surface cutting apparatus. It exists in being arrange | positioned symmetrically centering | focusing on the gravity center position.

  According to another feature of the present invention according to claim 6 configured as described above, in the curved surface cutting apparatus, the work table, the machining head, and the reaction body are arranged at the center of gravity in the left-right direction when viewed from the front. In other words, the work table, the machining head, and the reaction body are arranged on the center line in the left-right direction of the curved cutting apparatus (on the line extending in the front-rear direction of the curved cutting apparatus). As a result, in the curved surface cutting apparatus, the machining head and the reaction body reciprocate on the center line in the left-right direction of the curved surface cutting apparatus, so that the rotational moment generated by the reciprocal displacement can be suppressed, and machining accuracy and machining efficiency are improved. Can be improved.

It is the perspective view which looked at the outline of the appearance composition of the curved cutting device concerning the embodiment of the present invention from the slanting front. It is the perspective view which looked at the outline of the external appearance structure of the curved surface cutting apparatus shown in FIG. 1 from diagonally back. It is a block diagram of the control system for controlling the action | operation of the curved surface cutting apparatus shown in FIG. It is the perspective view which looked at the outline of the external appearance structure of the cutting tool unit with which the curved-surface cutting apparatus shown in FIG. It is a front view which shows the outline of the external appearance structure of the cutting tool unit shown in FIG. It is a disassembled perspective view of the cutting tool unit shown in FIG. (A), (B) has shown the cutting unit seen from the AA line shown in FIG. 5, in order to demonstrate the operation state of the cutting tool unit shown in FIG. 4, (A) is the 1st cutting. It is side surface sectional drawing of the cutting unit which showed the state which cuts with a tool, (B) is side surface sectional drawing of the cutting unit which showed the state which cuts with a 2nd cutting tool.

(Configuration of curved surface cutting apparatus 100)
Hereinafter, an embodiment of a curved surface cutting apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of an outline of an external configuration of a curved cutting apparatus 100 according to the present invention as viewed obliquely from the front. FIG. 2 is a perspective view of the outline of the external configuration of the curved cutting apparatus 100 shown in FIG. FIG. 3 is a block diagram of a control system for controlling the operation of the curved surface cutting apparatus 100. Note that the drawings referred to in this specification are schematically shown by exaggerating some of the components in order to facilitate understanding of the present invention. For this reason, the dimension, ratio, etc. between each component may differ. The curved surface cutting apparatus 100 is a machine tool that forms a piston for an internal combustion engine having an elliptical cross section by cutting the surface of the workpiece WK by computer control (NC control).

  The curved surface cutting apparatus 100 includes a bed 101. The bed 101 is a structure serving as a basis of the curved cutting apparatus 100, and is configured by welding a steel plate material to a box shape. A bed top plate 102 made of a steel plate material is provided on the upper surface of the bed 101. The bed top plate 102 is formed in a frame shape in which the upper surface is opened upward in the figure and the four sides are erected in a state of protruding to the front and left and right sides of the curved cutting apparatus 100. On the inner upper surface of the bed top plate 102, a work table 103 and a column 105 are provided.

  The work table 103 is a columnar mounting table that detachably holds a workpiece WK (indicated by a two-dot chain line in FIG. 1), and the bed table 102 (the curved surface cutting apparatus 100) in the horizontal direction shown in the figure. It is provided at the center position. The work table 103 is rotationally driven by a work drive motor 104 provided on the lower surface of the bed top plate 102. The work drive motor 104 is a prime mover that is rotationally driven by a control device 140 described later. In the present embodiment, the work drive motor 104 can rotationally drive the work table 103 in the range of 2000 to 4000 rpm. The column 105 is a steel-made column member mainly for supporting the cutting tool electric motor 106 and the cutting tool unit 110, respectively, and is configured in a gate shape standing up from the upper surface of the bed top plate 102 in the figure. The cutting tool motor 106 is a prime mover whose operation is controlled by the control device 140 to displace the cutting tool unit 110 along the vertical direction in the figure, and is provided on the upper surface of the column 105.

  As shown in FIGS. 4 to 6, the cutting tool unit 110 is a structure that movably supports the first processing head 122 and the second processing head 132 that cut the workpiece WK. It is arranged at the center of the gate-shaped column 105. More specifically, the cutting tool unit 110 is supported by a feed screw mechanism (not shown) that extends downward from the cutting tool electric motor 106 and guides the cutting tool unit 110 in the vertical direction in the figure. Are supported by the column 105 via the linear motion mechanism 107. The linear motion mechanism 107 is a linear guide component composed of a linear motion rail 107a (also referred to as an LM guide) and a linear motion block 107b that meshes with the linear motion rail 107a and slides and displaces.

  The cutting tool unit 110 includes an H-shaped support 111. The H-shaped column 111 is a steel columnar part having a substantially H-shaped cross section when viewed from the front, and is formed extending in the horizontal direction in the drawing. The upper and lower parts of the H-shaped support 111 shown in the figure are closed by flat support bases 121 and 131, respectively, and the cylindrical spaces respectively extend along the longitudinal direction (shown in the horizontal direction) of the H-shaped support 111. Is formed. These support bases 121 and 131 are plate-shaped bodies made of steel plates for movably supporting the first processing head 122 and the second processing head 132, respectively. In FIG. 6, the H-type support 111 is omitted.

  A first machining head 122 and a second machining head 132 are provided in each of the cylindrical spaces formed in the vertical direction in the figure by the H-shaped support column 111 and the support bases 121 and 131, respectively. The first machining head 122 and the second machining head 132 are respectively connected to the first cutting tool holder 123 and the second cutting tool holder 133, and the first cutting tool holder 123 and the second cutting tool holder 133. Each of the supporting plates 124 and 134 is supported. Among these, the first cutting tool holder 123 and the second cutting tool holder 133 are substantially cylindrical holders that detachably hold the first cutting tool 125 and the second cutting tool 135, respectively.

  Further, the first cutting tool 125 and the second cutting tool 135 are machining blades that cut the outer surface of the workpiece WK held on the work table 103 (in this embodiment, so-called cutting tools). ). In this case, in the present embodiment, the first cutting tool 125 is a so-called roughing blade, and the second cutting tool 135 is a so-called finishing blade. That is, the first machining head 122 and the second machining head 132 have the same structure and substantially the same mass except for the types of cutting tools to be held.

  Each of these first processing heads 122 and second processing heads 132 is supported by support bases 121 and 131 via linear motion mechanisms 126 and 136, respectively. The linear motion mechanisms 126 and 136 are parts that guide the first machining head 122 and the second machining head 132 in the approaching / separating direction to approach and separate from the workpiece WK held on the work table 103. The linear motion rails 126a and 136a (so-called LM guides) and the linear motion blocks 126b and 136b are configured.

  Among these, the linear motion rails 126a and 136a are track members extending in the contact / separation direction, and are attached to the respective center portions of the lower surface of the support base 121 and the upper surface of the support base 131 along the longitudinal direction. . In the present embodiment, each of the linear motion rails 126a and 136a is constituted by two bar-shaped track members extending in parallel to each other. The linear motion blocks 126b and 136b are movable bodies that mesh with the linear motion rails 126a and 136a and slide and displace on the linear motion rails 126a and 136a, and support plates 124 that face the linear motion rails 126a and 136a. Each is fixedly attached to the surface of 134. In the present embodiment, the linear motion blocks 126b and 136b are configured by a total of four movable bodies by fitting two movable bodies to one rod-shaped track member constituting each of the linear motion rails 126a and 136a. ing.

  Reciprocating displacement devices 127 and 137 are provided between the first processing head 122 and the second processing head 132 and the support plates 124 and 134, respectively. The reciprocating displacement devices 127 and 137 are prime movers for reciprocally displacing the first machining head 122 and the second machining head 132 along the contact and separation directions, respectively, and are linear motors that are controlled by the control device 140. It is constituted by. The reciprocating displacement mechanisms 127 and 137 include permanent magnets 127a and 137a provided on both left and right sides of the support plates 124 and 134, and coils supported by the support plates 124 and 134 at positions facing the permanent magnets 127a and 137a. 127b and 137b. That is, the reciprocating displacement devices 127 and 137 reciprocally displace the first machining head 122 and the second machining head 132 to which the permanent magnets 127a and 137a are attached by controlling the energization of the coils 127b and 137b by the control device 140. Let

  Further, position detectors 128 and 138 are provided on the upper surface of the support base 121 and the bottom surface of the support base 131 constituting the cutting tool unit 110, respectively. The position detectors 128 and 138 are measuring devices that detect the positions of the first processing head 122 and the second processing head 132 in the contact / separation direction and output detection signals to the control device 140, respectively. Operation is controlled by device 140. In the present embodiment, the position detectors 128 and 138 are each configured by a linear scale.

  The control device 140 is configured by a microcomputer including a CPU, a ROM, a RAM, and the like. The control device 140 comprehensively controls the entire operation of the curved surface cutting device 100 and a machining program (not shown) prepared by an operator (so-called). The workpiece WW is controlled by controlling the operations of the workpiece drive motor 104, the cutting tool motor 106, the reciprocating displacement devices 127 and 137 (coils 127b and 137b) and the position detectors 128 and 138 according to the NC (Numerical Control) program. The cutting process is performed. The control device 140 includes an input device 141 composed of an operation switch group for accepting an operation from the operator to the control device 140, and a liquid crystal display for displaying the operation status of the control device 140 to the worker. Each display device 142 is provided. The curved surface cutting apparatus 100 also supplies power for driving the workpiece drive motor 104, the cutting tool motor 106, the reciprocating displacement devices 127 and 137 (coils 127b and 137b), and the position detectors 128 and 138, respectively. However, the description of the configuration not directly related to the present invention will be omitted.

(Operation of curved surface cutting apparatus 100)
Next, the operation of the curved surface cutting apparatus 100 configured as described above will be described. First, the operator operates the input device 141 to turn on the curved cutting device 100, and then sets the workpiece WK on the work table 103. Then, the operator operates the input device 141 to instruct the control device 140 of the curved surface cutting device 100 to start cutting on the workpiece WK.

  In response to this instruction, the control device 140 starts cutting the workpiece WK according to a machining program (not shown). In this embodiment, the cutting process on the workpiece WK includes roughing and finishing processes on the workpiece WK. Therefore, first, the control device 140 starts with cutting by roughing the workpiece WK.

  Specifically, as shown in FIG. 7A, the control device 140 controls the operations of the cutting tool electric motor 106, the reciprocating displacement devices 127 and 137 (coils 127b and 137b), and the position detectors 128 and 138. As a result, the first cutting tool 125 is positioned at the cutting start position of the workpiece WK, and the second cutting tool 135 is displaced in the direction of separating from the workpiece WK (right side in FIG. 7). Position at the retracted position. In this case, the retracted position for positioning the second cutting tool 135 is a position where the second cutting tool 135 does not come into contact with the workpiece WK when the second cutting tool 135 is reciprocated, which will be described later, and is sufficiently separated from the workpiece WK. It is the position. In FIGS. 7A and 7B, the H-type support 111 is omitted.

  Next, the control device 140 starts cutting by roughing the workpiece WK. Specifically, the control device 140 controls the operation of the work drive motor 104 to rotate the work table 103, and controls the operations of the reciprocating displacement device 127 (coil 127b) and the position detector 128 to control the work. The first machining head 122 (first cutting tool 125) is reciprocally displaced in the contact / separation direction according to the rotation angle of the table 103 (see the broken arrow in the figure). Thereby, the outer surface of the workpiece WK is rough-cut by the first cutting tool 125 and formed into a predetermined elliptical shape.

  At the time of cutting the workpiece WK by the first cutting tool 125, the control device 140 controls each operation of the reciprocating displacement device 137 (coil 137b) and the position detector 138 to thereby perform the second operation. The machining head 132 is reciprocally displaced in the direction opposite to the displacement direction of the first machining head 122 in the contact / separation direction (see the broken arrow in the figure). That is, the control device 140 moves the second machining head 132 to the workpiece WK when the first machining head 122 is displaced in the direction in which the first machining head 122 approaches the workpiece WK (the direction in which the cutting depth becomes deep). When the first machining head 122 is displaced in the direction away from the workpiece WK (the direction in which the depth of cut becomes shallow), the second machining head 132 is moved in the direction away from the workpiece. It is displaced in a direction to approach the object WK.

  Thereby, in the cutting tool unit 110, vibration due to the reciprocating displacement of the first machining head 122 and vibration due to the reciprocating displacement of the second machining head 132 are simultaneously generated. In this case, the vibration due to the reciprocating displacement of the first machining head 122 and the vibration due to the reciprocating displacement of the second machining head 132 are vibrations in opposite phases, and both cancel each other and are attenuated. Accordingly, the first machining head 122 held by the cutting tool unit 110 can cut the workpiece WK while suppressing the influence of vibration caused by its own reciprocal displacement. The reciprocating displacement of the second machining head 132 in the contact / separation direction is continuously executed during the cutting by the first cutting tool 125.

  Then, when the rough machining on the workpiece WK is finished, the control device 140 executes the finishing process after the first cutting tool 125 is moved away from the workpiece WK and retracted. Specifically, as shown in FIG. 7B, the control device 140 controls the operations of the cutting tool electric motor 106, the reciprocating displacement devices 127 and 137 (coils 127b and 137b), and the position detectors 128 and 138. As a result, the second cutting tool 135 is positioned at the cutting start position of the workpiece WK, and the first cutting tool 125 is displaced in the direction separating from the workpiece WK (right side in FIG. 7). Position at the retracted position. In this case, the retracted position for positioning the first cutting tool 125 is a position that does not come into contact with the workpiece WK when the first cutting tool 125 is reciprocally displaced, which will be described later, like the retracted position. It is a position sufficiently away from the object WK.

  Next, the control device 140 starts cutting by finishing the workpiece WK. Specifically, the control device 140 controls the operations of the reciprocating displacement device 137 (coil 137b) and the position detector 138, and controls the second machining head 132 (second cutting head) according to the rotation angle of the work table 103. The tool 135) is reciprocally displaced in the contact / separation direction (see broken arrow in the figure). As a result, the outer surface of the workpiece WK is precisely finished by the second cutting tool 135 and formed into a predetermined elliptical shape.

  At the time of cutting the workpiece WK with the second cutting tool 135, the control device 140 controls each operation of the reciprocating displacement device 127 (coil 127b) and the position detector 128 to thereby perform the first operation. The machining head 122 is reciprocally displaced in the direction opposite to the displacement direction of the second machining head 132 in the contact / separation direction (see broken arrow in the figure). That is, the control device 140 moves the first machining head 122 to the workpiece WK when the second machining head 132 is displaced in a direction approaching the workpiece WK (a direction in which the depth of cut becomes deep). When the second machining head 132 is displaced in a direction away from the workpiece WK (a direction in which the depth of cut becomes shallow), the first machining head 122 is moved away from the workpiece WK. It is displaced in a direction to approach the object WK.

  Thereby, in the cutting tool unit 110, vibration due to the reciprocating displacement of the second machining head 132 and vibration due to the reciprocating displacement of the first machining head 122 occur simultaneously. Also in this case, since the vibration due to the reciprocating displacement of the second machining head 132 and the vibration due to the reciprocating displacement of the first machining head 122 are vibrations in opposite phases, both cancel each other and are attenuated. . Accordingly, the second machining head 132 held by the cutting tool unit 110 can cut the workpiece WK while suppressing the influence of vibration caused by its own reciprocal displacement. The reciprocating displacement of the first machining head 122 in the contact / separation direction is continuously executed during the cutting by the second cutting tool 135.

  Then, when the finishing process for the workpiece WK is completed, the control device 140 moves the second cutting tool 135 away from the workpiece WK and then retreats the workpiece drive motor 104. The rotation of the work table 103 is stopped by controlling. Thereby, the operator can obtain the workpiece WK whose outer surface is cut into an elliptical shape by removing the workpiece WK from the work table 103, and a new workpiece WK. By setting on the work table 103, the same cutting as described above can be performed on the new workpiece WK.

  As can be understood from the above description of operation, according to the above embodiment, the curved surface cutting apparatus 100 is configured so that the first cutting tool 125 or the second cutting tool 135 approaches and separates from the workpiece WK. When the reciprocating displacement is performed in the direction, the second cutting tool 135 or the first cutting tool 125 having substantially the same mass is reciprocally displaced in the direction opposite to the cutting tool. As a result, the vibration caused by the reciprocating displacement of the first cutting tool 125 or the second cutting tool 135 is caused by the vibration due to the reciprocating displacement of the second cutting tool 135 or the first cutting tool 125, that is, vibrations having opposite phases. It is offset and attenuated. As a result, it is possible to suppress vibration during the cutting of the workpiece WK, and to improve the machining accuracy of the workpiece WK and shorten the machining time.

  Furthermore, in carrying out the present invention, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the object of the present invention.

  For example, in the above-described embodiment, the curved cutting apparatus 100 has the second machining head 132 against the reciprocal displacement of the first machining head 122 when the workpiece WK is cut by the first cutting tool 125. Is reciprocally displaced in a direction opposite to the reciprocating displacement direction of the first machining head 122. That is, the second machining head 132 reciprocally displaced in the opposite direction to the displacement of the first machining head 122 corresponds to the reaction body according to the present invention. However, the reaction body is not necessarily a cutting tool as long as it is displaced in the opposite direction to the displacement of the first machining head 122. That is, the reaction body is not limited to the above-described embodiment as long as it has a mass that generates vibration that attenuates vibration generated by the reciprocating displacement of the first machining head 122.

  For example, the reaction body can be composed of various metals, ceramics, a liquid (including fluid) such as water or oil, or a weight made of a material such as a resin. Moreover, in the said embodiment, the 2nd cutting tool 135 as a reaction body is comprised with the cutter for finishing. However, the 1st cutting tool 125 and the 2nd cutting tool 135 can also be comprised with the cutter which performs the same process. In these cases, it is considered that the mass of the reaction body is preferably the same mass as that of the first machining head 122, but even if the mass is different from that of the first machining head 122, the first machining head 122 is reciprocated. It is possible to damp vibrations caused by displacement.

  In the above embodiment, the reciprocating displacement mechanisms 127 and 137 for reciprocating the first machining head 122 and the second machining head 132 in the contact / separation direction are configured by linear motors. That is, the reciprocating displacement mechanism 127 that reciprocally displaces the first machining head 122 in the contact / separation direction corresponds to the machining head displacement means according to the present invention, and the reciprocation that reciprocally displaces the second machining head 132 in the contact / separation direction. The displacement mechanism 137 corresponds to the reaction body displacement means according to the present invention. However, the machining head displacing means and the reaction body displacing means are not limited to the above-described embodiment as long as they are mechanisms that reciprocate the first machining head 122 and the second machining head 132 in the contact / separation direction. . For example, the machining head displacing means and the reaction body displacing means can be constituted by a ball screw feeding mechanism.

  In this case, the machining head displacing means and the reaction body displacing means can be configured such that the first machining head 122 and the second machining head 132 are reciprocally displaced by using separate and independent ball screws. . Further, one ball screw can be shared between the machining head displacement means and the reaction body displacement means. Specifically, the opposite screw threads are formed on both sides of one ball screw, and the first machining head 122 and the second machining head 132 are supported on each screw thread, respectively. According to this, by rotating this one ball screw, the first machining head 122 and the second machining head 132 on the ball screw can be displaced in opposite directions.

  In the above embodiment, the machining head displacing means including the reciprocating displacement mechanism 127 is configured to displace the first machining head 122 with respect to the workpiece WK. However, the processing head displacing means is not limited to the above embodiment as long as the first processing head 122 and the workpiece WK are relatively reciprocally displaced. That is, the processing head displacing unit may be configured to reciprocate the workpiece WK with respect to the first processing head 122. In this case, the mass of the reaction body constituted by the second machining head 132 or the weight is the mass of an object that reciprocally moves together with the workpiece WK (for example, the work table 103 on which the workpiece WK is placed). It becomes a thing corresponding to.

  Moreover, in the said embodiment, the 1st process head 122 and the 2nd process head 132 were arranged in parallel adjacently adjacent to the up-down direction of illustration. However, the positional relationship between the first processing head 122 and the second processing head 132 is not limited to the above-described embodiment as long as the positional relationship can mutually attenuate vibrations generated from each other. For example, the first machining head 122 and the second machining head 132 may be arranged in parallel, adjacent to each other in the horizontal direction in the figure. In addition, the first processing head 122 and the second processing head 132 may be arranged in series along the contact / separation direction. In addition, when the 1st processing head 122 and the 2nd processing head 132 are directly arrange | positioned, the 1st processing head 122 and 2nd which oppose the workpiece WK by rotating the cutting tool unit 110 180 degree | times. The machining head 132 can be exchanged for cutting.

  In the above embodiment, the curved surface cutting apparatus 100 is configured to cut the outer surface of the workpiece WK into an elliptical shape. However, the curved surface cutting apparatus 100 cuts a curved surface shape on the surface of the workpiece WK by reciprocating the first cutting tool 125 in the contact / separation direction according to the rotation angle of the workpiece WK. The present invention can be widely applied to a cutting device. That is, the curved surface cutting device 100 does not necessarily need to be a cutting device that cuts the outer surface of the workpiece WK into an elliptical shape. For example, the inner surface of the workpiece WK is cut into an elliptical shape. A cutting device for processing may be used, or a cutting device for cutting the outer surface or the inner surface of the workpiece WK into a curved surface shape (for example, a heart shape) other than an elliptical shape may be used. . That is, the curved surface cutting apparatus according to the present invention can be implemented as a machine tool that cuts parts other than the piston for an internal combustion engine, for example, parts such as a piston ring and a cam, as the workpiece WK.

  Further, in the above embodiment, the curved surface cutting apparatus 100 is configured such that the work table 103, the first processing head 122, and the second processing head 132 are centered in the left-right direction in the front view of the curved surface cutting apparatus 100, that is, the same. It was arranged on an orthogonal line passing through the center of gravity in the left-right direction. As a result, the curved cutting apparatus 100 causes the first machining head 122 and the second machining head 132 to reciprocate on the orthogonal line (on the line extending in the front-rear direction of the curved cutting apparatus 100 through the center of gravity). Rotational moment caused by reciprocal displacement can be suppressed, and machining accuracy and machining efficiency can be improved. However, it is excluded that the work table 103, the first machining head 122, and the second machining head 132 are shifted from the orthogonal line (on the center line (on the line extending in the front-rear direction of the curved cutting apparatus 100)). is not. That is, the work table 103, the first machining head 122, and the second machining head 132 are limited to the above-described embodiment as long as the workpiece table WK placed on the work table 103 can be cut. Is not to be done.

WK ... Workpiece,
DESCRIPTION OF SYMBOLS 100 ... Curved surface processing apparatus, 101 ... Bed, 102 ... Bed top plate, 103 ... Work table, 104 ... Work drive motor, 105 ... Column, 106 ... Cutting tool motor, 107 ... Linear motion mechanism, 107a ... Linear motion rail, 107b ... linear motion block,
110: Cutting tool unit, 111: H-type support,
121, 131 ... support base, 122, 132 ... first machining head, second machining head,
123, 133 ... first cutting holder, second cutting holder, 124, 134 ... support plate, 125, 135 ... first cutting tool, second cutting tool, 126, 136 ... linear motion mechanism, 126a , 136a ... linear motion rail, 126b, 136b ... linear motion block, 127, 137 ... reciprocating displacement mechanism, 127a, 137a ... permanent magnet, 127b, 137b ... coil, 128, 138 ... position detector.

Claims (6)

A machining head for holding a cutting tool for cutting the surface of the workpiece;
A machining head displacing means for relatively displacing the machining head in an approaching / separating direction in which the machining head is moved toward and away from the workpiece;
Control means for controlling the operation of the machining head displacement means to cut the workpiece by the cutting tool, and bringing the cutting tool into contact with the surface of the workpiece to be curved. In curved surface cutting equipment that cuts into shape,
A reaction body having a predetermined mass;
A reaction body displacement means for displacing the reaction body in the contact / separation direction;
The control means includes
A curved surface cutting apparatus characterized by controlling the operation of the reaction body displacement means to displace the reaction body in a direction opposite to a relative displacement direction of the machining head. In the curved surface cutting apparatus according to claim 1,
The reaction body is a second processing head that holds a second cutting tool that cuts the surface of the workpiece.
The curved surface cutting apparatus characterized by the said control means controlling the action | operation of the said reaction body displacement means, and cutting the said to-be-processed object with the said 2nd cutting tool. In the curved surface cutting apparatus according to claim 2,
The cutting tool is for roughing,
The second cutting tool is for a finishing process, and is a curved surface cutting apparatus. In the curved surface cutting apparatus according to any one of claims 1 to 3,
The reaction body is arranged adjacent to and parallel to the machining head. In the curved surface cutting apparatus according to claim 1,
The curved surface cutting apparatus according to claim 1, wherein the reaction body is disposed on the contact / separation direction line where the machining head is displaced and is displaced along the contact / separation direction line. In the curved surface cutting apparatus according to any one of claims 1 to 5,
A curved surface characterized in that the work table for holding the workpiece, the machining head, and the reaction body are arranged symmetrically about the center of gravity in the horizontal direction in the front view of the curved cutting apparatus. Cutting device.

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