JP2013022706A - Auxiliary device for processing of workpiece and usage thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an auxiliary device for processing of a workpiece, which can prevent a chattering phenomenon in processing of a workpiece which is relatively long and thin.SOLUTION: There is provided an auxiliary device 3 for processing, which is set in a thin workpiece 1, which is in a corrugated shape and has connected cavities, and used when processing an outer peripheral surface 1f of the workpiece 1. Auxiliary units 3A, 3B, 3C, and 3D comprise: base materials 5 arranged in a longer direction of the workpiece 1; bolts 6 stood on the base materials 5 and having screw parts 6a formed at shaft parts; diameter increase members 7 on which the screw parts 6a of the bolts 6 are threadably mounted, and move up and down as the bolts 6 are rotated; a pair of press members 9, 9 which abut on the diameter increase members 7, and swing in a short direction of the workpiece 1 with a pair of pins 8, 8 provided to the base materials 5 as axes as the diameter increase members 7 move up and down; and springs 10 which press those press members 9, 9 against the side of the diameter increase members 7. The auxiliary units 3A, 3B, 3C, and 3D are set successively in the workpiece 1.

Description

  The present invention relates to a work processing auxiliary device used when cutting a relatively long and thin work such as a water jacket insert for casting a cylinder block of an engine and a method of using the work auxiliary device.

Conventionally, when a water jacket formed on a cylinder block of an engine is cast with a mold, a steel insert is used. Since the water jacket coolant must flow smoothly without stagnation, the surface of the water jacket is required to be processed with relatively high accuracy.
Therefore, it is known that the processing is performed by fitting a wedge-shaped urethane block that comes into contact with the inner wall so that a thin workpiece does not chatter during processing.

Moreover, as a technique for preventing chattering during workpiece machining, Patent Document 1 discloses a support jig that supports a contactor in contact with the inner peripheral surface of a workpiece by a link mechanism that bends and stretches in a pantograph manner. .
Further, in Patent Document 2, when the outer surface of a cylindrical workpiece is ground, the workpiece is held at the center position of the grinding machine. A holding jig in which a workpiece is sandwiched between members is disclosed.

Japanese Patent Publication No. 60-5405 JP-A-2005-59182

However, in the method of fitting the urethane block, since the urethane is soft, the chatter phenomenon due to resonance when processing a long workpiece cannot be completely suppressed, and even if you try to remove the urethane block after processing, the urethane block Bite into the workpiece and was difficult to remove.

Moreover, in the technique described in Patent Document 1, since it is a pantograph type, it is difficult to firmly support the workpiece while the contact easily swings around the shaft during processing.
Moreover, in the technique described in Patent Document 2, since only the opening portions at both ends of the cylindrical workpiece are supported, there is a problem that it is difficult to prevent vibration for a relatively long cylindrical workpiece.

  The present invention has been made in view of such problems of the prior art, and the object of the present invention is to prevent chattering during machining of relatively long and thin workpieces. It is an object of the present invention to provide an auxiliary device for machining a workpiece that can be used and a method for using the same.

In order to solve the above-mentioned problem, the invention according to claim 1 is an auxiliary device for processing that is set and used inside a workpiece when processing the outer peripheral surface of a thin workpiece having a wave shape and continuous cavities. A base material arranged in the longitudinal direction, a bolt standing on the base material so as to be rotatable, and a screw part formed on a shaft part, and a screw part of this bolt screwed together. A diameter expanding member, a pair of pressing members which are in contact with the diameter expanding member and swing in the short direction of the workpiece with a pair of pins provided on the base member as an axis by the lifting operation of the diameter expanding member, An auxiliary unit is constituted by a spring that presses the pressing member toward the diameter-expanding member, and the auxiliary unit is provided in series and set inside the workpiece.

  The auxiliary units set at both ends of the work can be provided with pressing members that press the work inner peripheral surface of the end in the longitudinal direction of the work. Further, it is preferable that the inclination angle of the outer peripheral surface of the diameter-expanding member is the same as the inclination angle of the inner peripheral surface of the workpiece.

According to a fourth aspect of the present invention, there is provided a method of using the workpiece machining auxiliary device according to any one of the first to third aspects, wherein an auxiliary device configured by connecting an auxiliary unit in series is used. It is set inside, then the auxiliary units for both ends are operated to position the entire auxiliary device, and then the other auxiliary units are sequentially operated.

According to the first aspect of the present invention, since the pressing member is firmly supported by swinging the pressing member by moving the diameter-expanding member by rotating the bolt, the corrugated shape Thus, the outer peripheral surface of a thin workpiece can be processed smoothly.

If a pressing member that presses the inner peripheral surface of the workpiece in the longitudinal direction of the workpiece is provided in the auxiliary unit set at both ends of the workpiece, the pressing member presses the workpiece in the short direction even for a long workpiece. The inner peripheral surface of the workpiece can be firmly supported in cooperation with
Moreover, if the inclination angle of the outer peripheral surface of the diameter-expanding member is formed at the same angle as the inclination angle of the work inner peripheral surface, the pressing member adheres to the work inner peripheral surface and reliably supports the work inner peripheral surface. Can do.

According to the fourth aspect of the present invention, first, the auxiliary device constituted by connecting the auxiliary units is set on the workpiece, and then the auxiliary unit for both ends is operated to position the auxiliary device as a whole and the workpiece. Since the work inner peripheral surface in the short direction of the work is pressed by sequentially operating the other auxiliary units in order to make the longitudinal direction of the work in a tension state, the entire work can be firmly supported.

It is explanatory drawing of a workpiece | work, (a) is a perspective view, (b) is sectional drawing. The top view of the auxiliary | assistant apparatus for a workpiece | work processing which concerns on this invention Side view of a workpiece machining auxiliary device according to the present invention Cross section of auxiliary unit It is usage explanatory drawing of a processing auxiliary device, (a) is a top view, (b) is a sectional view.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, a workpiece 1 in which a workpiece machining auxiliary device according to the present invention is used is a water jacket insert for casting a cylinder block of an engine, and four substantially cylindrical cavities 1 a and 1 b. , 1c, 1d are formed in a continuous wave shape, are thin and relatively long. Reference numeral 2 denotes a mold.

As shown in FIGS. 2 and 3, the processing auxiliary device 3 includes four auxiliary units 3A, 3B, 3C, and 3D connected in series. The auxiliary units 3A and 3D at both ends are set in cavities 1a and 1d located at both ends of the work 1, and the other auxiliary units 3B and 3C are set in cavities 1b and 1c sandwiched between the cavities 1a and 1d.

As shown in FIGS. 2 to 4, the auxiliary units 3 </ b> A, 3 </ b> B, 3 </ b> C, and 3 </ b> D are erected on the base material 5 disposed in the longitudinal direction of the work 1 and the base material 5. A bolt 6 formed with 6 a, a diameter-expanding member 7 that is screwed into the threaded portion 6 a of the bolt 6, and moves up and down by the rotation of the bolt 6; A pair of pressing members 9, 9 swinging in the short direction of the work 1 around a pair of pins 8, 8 provided on the base material 5 by operation, and these pressing members 9, 9 on the diameter expanding member 7 side It comprises a plurality of springs 10 to be pressed. 11 is a bearing.

The diameter-expanding member 7 has a substantially quadrangular prism shape, and a female screw hole 7a is formed at the center thereof, and a screw part (male screw part) 6a of a bolt 6 is screwed into the female screw hole 7a. The inclination angle θ1 of the outer peripheral surface 7b of the diameter expanding member 7 is formed at the same angle as the inclination angle θ2 of the inner peripheral surface 1e of the workpiece 1 shown in FIG. Further, the outer surface 9 a of the pressing member 9 is formed in a curved surface shape so as to coincide with the inner peripheral surface 1 e of the work 1.

  Further, in the auxiliary units 3A and 3D set in the cavities 1a and 1d located at both ends of the workpiece 1, the pins 12 provided on the base material 5 by the lifting and lowering operation of the diameter expanding member 7 are used in the longitudinal direction of the workpiece 1. A swinging pressing member 13 is provided. The pressing member 13 presses the work inner peripheral surface 1 e at the end in the longitudinal direction of the work 1. The spring 10 is stretched between the base member 5 and the pressing member 9 or between the pressing member 9 and the pressing member 13.

  The operation of the workpiece machining auxiliary device 3 configured as described above and the method of using the machining auxiliary device 3 will be described. As shown in FIG. 5A, the processing auxiliary device 3 is set on the work (nesting) 1 integrated with the mold 2 from above. At this time, the processing auxiliary device 3 is locked and positioned by the step portion 15 provided on the workpiece 1.

When the setting of the machining auxiliary device 3 to the workpiece 1 is completed, the operator then rotates the bolt 6 of the auxiliary unit 3A located at the left end shown in FIG. The expanded diameter member 7 is lowered. When the diameter-expanding member 7 is lowered while sliding on the base material 5 and the pressing members 9, 9, 13, the pressing members 9, 9, 13 swingable by the pins 8, 8, 12 provided on the base material 5 are springs. It swings toward the workpiece 1 against the elastic force of 10.

Then, as shown in FIG. 5B, the two pressing members 9, 9 in the short direction of the workpiece 1 swing and come into contact with the inner peripheral surface 1 e of the workpiece 1, and one pressing in the longitudinal direction of the workpiece 1. The member 13 swings and comes into contact with the work inner peripheral surface 1e at the left end.

Here, the outer peripheral surface 7b of the diameter-expanding member 7 that moves up and down by the rotation of the bolt 6 is formed so as to match the work inner peripheral surface 1e, and the pins 8, 8, 12 and the pressing members 9, 9, and 13 through which the pins 8, 8, and 12 are inserted, a relatively large clearance is provided, so that the pressing members 9, 9, and 13 are smooth. The workpiece inner circumferential surface 1e can be pressed in conformity with the workpiece inner circumferential surface 1e.

  Next, the bolt 6 of the auxiliary unit 3D located at the right end is rotated counterclockwise with a torque wrench, and the diameter-expanding member 7 screwed into the bolt 6 is lowered. When the diameter-expanding member 7 is lowered while sliding on the base material 5 and the pressing members 9, 9, 13, the pressing members 9, 9, 13 swingable by the pins 8, 8, 12 provided on the base material 5 are springs. It swings toward the workpiece 1 against the elastic force of 10.

Then, as shown in FIG. 5B, the two pressing members 9, 9 in the short direction of the workpiece 1 swing and come into contact with the inner peripheral surface 1 e of the workpiece 1, and one pressing in the longitudinal direction of the workpiece 1. The member 13 swings and comes into contact with the work inner peripheral surface 1e at the right end. The auxiliary units 3 </ b> A and 3 </ b> D apply pressing forces in opposite directions in the longitudinal direction of the work 1.

When the operation of the auxiliary units 3A and 3D is completed, the bolt 6 is then rotated counterclockwise with a torque wrench and the diameter expanding member 7 screwed into the bolt 6 is lowered with respect to the auxiliary units 3B and 3C. When the diameter expanding member 7 is lowered while sliding on the base material 5 and the pressing members 9, 9, the pressing members 9, 9 that are swingable by the pins 8, 8 provided on the base material 5 resist the elastic force of the spring 10. And swings toward the workpiece 1 side.

At this time, since the workpiece 1 is in a tensioned state in the longitudinal direction of the workpiece 1 by the auxiliary units 3A and 3D, the pressing members 9 and 9 of the auxiliary units 3B and 3C are further in the short direction of the workpiece 1 and the workpiece inner peripheral surface 1e. By pressing, the entire work 1 can be firmly supported.

  As described above, when the machining auxiliary device 3 is set in the workpiece 1 and the operation is completed, the outer peripheral surface 1f of the workpiece 1 is machined by a cutting tool such as an end mill. At this time, since the pressing members 9, 9, and 13 firmly support the inner peripheral surface 1e of the workpiece, the outer peripheral surface 1f of the thin workpiece 1 having a corrugated shape can be smoothly processed without causing chattering. it can.

When the processing of the outer peripheral surface 1f of the workpiece 1 is finished, the operator rotates the bolt 6 in the opposite direction to that described above, and the elastic member 10 swings the pressing members 9, 9, and 13 toward the enlarged member 7 side. Move. Next, the processing auxiliary device 3 is lifted and removed from the workpiece 1.

According to the present invention, since the pressing member is rocked by moving the diameter expanding member up and down by rotating the bolt, the pressing member firmly supports the inner peripheral surface of the workpiece. Provided is an auxiliary device for processing a workpiece that can smoothly process the outer peripheral surface of the workpiece without causing chatter, and a method for using the auxiliary device.

DESCRIPTION OF SYMBOLS 1 ... Work, 1a, 1b, 1c, 1d ... Cavity, 1e ... Inner peripheral surface, 1f ... Outer peripheral surface, 2 ... Mold, 3 ... Processing auxiliary device, 3A, 3B, 3C, 3D ... Auxiliary unit, 5 ... Base material, 6 ... bolt, 6a ... threaded portion, 7 ... diameter-expanding member, 7b ... outer peripheral surface, 8, 12 ... pin, 9, 13 ... pressing member, 10 ... spring, [theta] 1, [theta] 2 ... inclination angle.

Claims (4)

A processing auxiliary device that is set and used inside a workpiece when processing the outer peripheral surface of a thin workpiece having cavities and continuous cavities, and a substrate disposed in the longitudinal direction of the workpiece, and the substrate A bolt having a threaded portion formed on a shaft portion, a diameter-expanding member that is screwed into the threaded portion of the bolt, and moves up and down by the rotation of the bolt, and abuts on the diameter-expanding member, Assisted by a pair of pressing members that swing in the short direction of the work with a pair of pins provided on the base as an axis by raising and lowering the diameter increasing member, and a spring that presses these pressing members against the side of the diameter increasing member An auxiliary device for processing a workpiece, characterized in that a unit is formed, and the auxiliary unit is connected in series and set inside the workpiece. 2. The workpiece processing auxiliary device according to claim 1, wherein the auxiliary units set at both ends of the workpiece are each provided with a pressing member that presses the inner peripheral surface of the workpiece in the longitudinal direction of the workpiece. An auxiliary device for machining workpieces characterized by The work machining auxiliary device according to claim 1 or 2, wherein an inclination angle of the outer peripheral surface of the diameter-expanding member is formed at the same angle as an inclination angle of the inner peripheral surface of the work. Auxiliary equipment for machining. 4. A method of using an auxiliary device for processing a workpiece according to claim 1, wherein an auxiliary device configured by connecting auxiliary units is first set inside the workpiece, and then for both ends. A method of using an auxiliary device for processing a workpiece, wherein the auxiliary unit is operated to position the entire auxiliary device, and then the other auxiliary units are sequentially operated.

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