JP2015199188A - Cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further extend the life of a cutting blade in a cutting device which cuts a part of an insert when removing an unnecessary part made of a resin by cutting work.SOLUTION: A cutting device 1 removes a resin gate part 106 of a manufacturing intermediate body 100 from an intermediate main body 105 to manufacture a mold product 101. The cutting device 1 includes: a resin cutting blade 20a; and an insert cutting blade 30a. The resin cutting blade 20a turns the gate part 106 while rotating around a rotation axis S1. The insert cutting blade 30a turns an adjustment part 103f of an insert 103 while rotating around the rotation axis S1.

Description

  The present invention relates to a cutting apparatus for removing unnecessary portions such as a gate portion by cutting from an intermediate for producing an injection molded product.

  As an example of a resin molded product, a steel core bar provided as an insert can be cited. As this resin molded product, an annular thing can be illustrated. This annular resin molded product is formed by placing a cored bar as an insert in the center and filling a donut-shaped cavity around the insert with a thermoplastic resin (such as 66 nylon).

  In the resin molded product, in order to uniformly fill the resin, the gate of the mold is arranged at the center of one side surface of the annular insert. In this case, the molten resin that has flowed into the cavity from the gate passes through the disk-shaped inflow portion on the one side surface of the insert, and is filled into the donut-shaped cavity on the outer periphery side of the insert. Thereby, the intermediate for manufacture in the state in which the resin with which the disk-shaped inflow part was filled had covered one side of the insert is obtained. The resin filled in the disc-shaped inflow portion is called, for example, a gate portion and is unnecessary as a product, and is removed by cutting or the like.

  In addition, various apparatuses are proposed as a general apparatus for cutting (for example, refer patent documents 1-3).

  The deburring cutter described in Patent Document 1 has a configuration in which a plurality of types of blades (general cutting blades and deburring blades) are mounted in milling. In this deburring cutter, as described in the [Action] column on the right column of page 2 of Patent Document 1, the deburring cutter was set to a negative corner angle at the portion left by the general cutting blade. By using a deburring blade, cutting is performed so as to cut off from the tip end side of the blade edge to prevent the generation of burrs. About this deburring cutter, as regulated in Patent Document 1, page 2, right column, line 18 to page 2, lower left column, line 5, there is a predetermined interval at the outer periphery of the tip of the cutter body (1). A mounting groove (3) for mounting a plurality of general cutting blades (2) is formed. A mounting groove (5) for mounting the deburring blade (4) is formed at one or a plurality of locations between the general cutting blades (2).

  Patent Document 2 describes a deburring tool that cuts a burr attached to a side surface of a cylindrical metal conductor insert-molded into a cast insulator (resin) while rotating with a plurality of blades. As described in [0018] to [0019] of Patent Document 2, the three cutting edges (35) of the deburring tool (24) are spaced equidistantly in the circumferential direction on the tool body (31). It is attached. A tip (37) for cutting burrs is provided at the tip of each cutting blade (35).

  The chamfering machine described in Patent Document 3 has a configuration capable of mounting a plurality of types of cutting tips.

Japanese Patent Laid-Open No. 2-116408 JP-A-11-90718 JP 2000-5916 A

  By the way, in the injection-molded article having the insert described above, the gate portion (resin) and the insert (for example, steel material) are in contact with each other. For this reason, in order to completely separate the gate portion from the portion other than the gate portion, the cutting blade needs to cut the gate portion so as to penetrate the gate portion, and the insert surface also needs to be cut slightly. is there. In this case, if a resin cutting tip is used for cutting the steel gate part, the resin cutting tip is lower in strength than the steel cutting tip, so the tip of the resin cutting blade is used when cutting the metal insert surface. Is easy to break.

  Therefore, it is conceivable to use a steel cutting tip for cutting the gate portion. As a steel material cutting tip, a tip having a smaller blade width (cutting edge angle) and higher strength than a resin cutting tip is used. The steel cutting tip can cut both the resin gate portion and the steel insert, but the tip side is long because the tip edge is small. That is, the contact portion between the chip side surface and the gate portion (resin) becomes large. For this reason, in the steel material cutting tip, there is a problem that the side surface of the blade and heat generation due to friction with the resin are likely to occur, and the tip life is shortened.

  Patent Documents 1 to 3 describe a device that mounts a plurality of blades or cutting tips and performs deburring and chamfering of a workpiece while rotating. However, it cannot be said that special consideration is given to the cutting of the resin molded product in which the insert is embedded.

  In view of the above circumstances, an object of the present invention is to extend the life of a cutting blade in a cutting apparatus that also cuts a part of an insert when an unnecessary resin portion is removed by cutting. .

  (1) In order to solve the above problems, a cutting device according to an aspect of the present invention is a resin in an intermediate for production formed by injection molding a molten resin from a gate toward a cavity in which an insert is disposed. A cutting device for manufacturing a molded product by removing a first predetermined part made of a product from a part other than the first predetermined part in the manufacturing intermediate, the holder being held by the holder and having a predetermined A cutting blade for resin for turning at least a part of the first predetermined portion while rotating around the rotation axis, and the insert adjacent to the first predetermined portion while being held by the holder and rotating around the rotation axis And a cutting blade for insert for turning the second predetermined portion.

  According to this configuration, the resin cutting blade cuts the first predetermined portion made of resin. The insert cutting blade cuts the second predetermined portion adjacent to the first predetermined portion. With such a configuration, the resin cutting blade only needs to cut the resin, and does not need to cut the insert. Therefore, since the breakage of the cutting blade for resin can be suppressed, the life of the cutting blade for resin can be extended. Further, most or all of the first predetermined portion made of resin, which is present in the movement path of the cutting blade for insert, is cut with the cutting blade for resin. Thereby, since the cutting blade for inserts can reduce markedly the quantity which cuts the resin-made 1st predetermined part, and the quantity which contacts a 1st predetermined part, it can suppress the abrasion of the said cutting blade for inserts. Furthermore, since the cutting blade for insert is suppressed from sliding frictionally with the first predetermined portion (resin), it becomes difficult to generate heat, and deterioration of the cutting blade for insert can be suppressed. That is, the life of the cutting blade for insert can be extended.

  Depending on the above, in the cutting apparatus that also cuts a part of the insert when the unnecessary resin portion is removed by cutting, the life of the cutting blade can be further extended.

  (2) Preferably, the strength of the cutting blade for insert is set higher than the strength of the cutting blade for resin.

  According to this configuration, when the strength of the second predetermined portion of the insert is greater than the strength of the first predetermined portion made of resin, wear of the cutting blade for insert can be further suppressed. Therefore, the life of the cutting blade for insert can be made longer.

  (3) Preferably, the protruding amount of the cutting blade for insert from the holder toward the manufacturing intermediate is larger than the protruding amount of the cutting blade for resin from the holder to the intermediate for manufacturing. It is set large.

  According to this structure, it is suppressed more reliably that the cutting blade for resin contacts the insert located in the back | inner side of resin 1st predetermined part. Therefore, it can suppress more reliably that the cutting blade for resin wears by contact with an insert.

  (4) Preferably, the width of the cutting edge of the cutting blade for insert is set smaller than the width of the cutting edge of the cutting blade for resin in the radial direction of the rotation axis.

  According to this configuration, the resin cutting blade cuts the first predetermined portion, thereby forming a wide space in the radial direction of the rotation axis. And the cutting blade for inserts can cut the 2nd predetermined part of an insert in the state where abrasion and heat generation by contact with a resin part were controlled by passing through this wide space. Thereby, the lifetime of the cutting blade for inserts can be made longer.

  (5) Preferably, the curvature radius of the cutting edge of the cutting blade for insert when set along the circumferential direction of the rotation axis is set smaller than the curvature radius of the cutting edge of the cutting blade for resin.

  According to this structure, the cutting edge of the cutting blade for insert can be made into a sharper shape. Thereby, it can suppress that a big level | step difference arises on the surface of the insert cut with the cutting blade for inserts, and can suppress that a burr | flash produces on the surface of an insert. Therefore, the molded product can be finished in a more beautiful state.

  (6) Preferably, the said cutting blade for resin and the said cutting blade for insert are each provided with two or more, and are arrange | positioned around the said rotating shaft line alternately.

  According to this structure, the load which acts on each cutting blade for resin and each cutting blade for insert can be made more equal. Therefore, the lifetime as each cutting blade for resin and each cutting blade for insert can be made longer.

  (7) Preferably, the cutting device is configured such that a portion other than the first predetermined portion in the resin portion of the manufacturing intermediate and the first portion are arranged along the radial direction of the rotation axis. The intermediate for production having a structure is configured to be able to cut a boundary portion between the portion other than the first predetermined portion and the first predetermined portion, and the resin cutting blade includes a first resin cutting blade and The first resin cutting blade is formed as a single blade facing the side of the resin portion other than the first predetermined portion, and the second resin cutting blade. Is formed as a single blade facing the first predetermined portion side.

  According to this configuration, the cutting operation of the first predetermined portion that is the resin portion can be performed separately on the first predetermined portion side and on the portion side other than the first predetermined portion. More specifically, each of the first resin cutting blade and the second resin cutting blade is such that one of the pair of side surfaces contacts the resin and the other does not substantially contact the resin. It becomes. For this reason, compared with the case where the 1st predetermined part is cut with one cutting blade for resin, the contact amount of each cutting blade for resin and the resin part can be halved. Thereby, since the heat generated by sliding between each resin cutting blade and the resin portion can be remarkably reduced, the life of each resin cutting blade can be further extended.

  (8) More preferably, the width of the cutting edge of the first resin cutting blade is set smaller than the width of the cutting edge of the second resin cutting blade in the radial direction of the rotation axis.

  According to this configuration, the cutting edge of the first resin cutting blade can be made to have a sharper shape. Thereby, it can suppress that a big level | step difference arises in the surface of parts other than the 1st part in the intermediate body for manufacture cut with the cutting blade for 1st resin, and can suppress that a burr | flash produces on the said surface. Therefore, the molded product can be finished in a more beautiful state.

  (9) Preferably, with respect to the radial direction of the rotation axis, the position of the cutting edge of the second resin cutting blade is set on the first predetermined portion side with respect to the position of the cutting edge of the first resin cutting blade. ing.

  According to this structure, it can suppress that a big level | step difference arises in the surface of parts other than the 1st part in the intermediate body for manufacture cut with the cutting blade for 1st resin, and it suppresses that the burr | flash produces on the said surface. it can. Therefore, the molded product can be finished in a more beautiful state.

  (10) Preferably, the curvature radius of the cutting edge of the first resin cutting blade when viewed along the circumferential direction of the rotation axis is set smaller than the curvature radius of the cutting edge of the second resin cutting blade. Has been.

  According to this configuration, the cutting edge of the first resin cutting blade can be made to have a sharper shape. Thereby, it can suppress that a big level | step difference arises in the surface of parts other than the 1st part in the intermediate body for manufacture cut with the cutting blade for 1st resin, and can suppress that a burr | flash produces on the said surface. Therefore, the molded product can be finished in a more beautiful state.

  (11) Preferably, the protrusion amount of the first resin cutting blade from the holder toward the manufacturing intermediate is the second resin cutting blade from the holder toward the manufacturing intermediate. It is set larger than the protruding amount.

  According to this structure, the 1st cutting blade for resin can remove the burr | flash of the circumference | surroundings of a 1st predetermined part more beautifully.

(12) Preferably, the cutting device includes an urging mechanism capable of urging the first predetermined portion toward the side opposite to the holder side when the resin cutting blade turns the first predetermined portion. In addition.

  According to this configuration, the turned first predetermined portion is urged to the side opposite to the holder side by the urging mechanism. For this reason, after the turning, when the holder is separated from the manufacturing intermediate, the first predetermined portion separated by the turning from the manufacturing intermediate remains attached to the resin cutting blade held by the holder Is easily prevented from occurring. Then, since the first predetermined portion after separation is prevented from adhering to the cutting blade for resin on the holder side, it occurred at the time of the previous cutting when the cutting intermediate was cut by the cutting device. The first predetermined portion does not interfere with the cutting operation of the next production intermediate. Thereby, the smooth process at the time of cutting the some intermediate body for manufacture sequentially in order is realizable.

(13) Preferably, the urging mechanism includes an urging plate capable of abutting on the first predetermined portion when the resin cutting blade turns the first predetermined portion, and the urging plate with the holder. And a biasing spring capable of biasing the biasing plate toward the side opposite to the holder side when the resin cutting blade turns the first predetermined portion. .

  According to this configuration, the biasing mechanism for preventing the first predetermined portion separated from the manufacturing intermediate from adhering to the cutting blade for resin on the holder side is used by the biasing plate and the biasing spring. It can be easily realized with a simple structure.

(14) Preferably, the urging mechanism includes: an urging plate that can contact the first predetermined portion when the resin cutting blade turns the first predetermined portion; and And an urging cylinder mechanism capable of urging the urging plate toward the side opposite to the holder side when the first predetermined portion is turned.

  According to this configuration, the biasing mechanism that prevents the first predetermined portion separated from the manufacturing intermediate from adhering to the cutting blade for resin on the holder side is used as the biasing plate and the biasing cylinder mechanism. It can be easily realized with a simple structure.

  ADVANTAGE OF THE INVENTION According to this invention, when removing the resin unnecessary part using a cutting process, in the cutting apparatus which also cuts a part of insert, the lifetime of a cutting blade can be made longer.

1 is a schematic cross-sectional view of an intermediate for manufacturing a molded product according to an embodiment of the present invention and a molded product. It is a side view of the principal part of the cutting device concerning one Embodiment of this invention, and has shown one part by the cross section. It is a bottom view of the cutting unit of a cutting device. It is a side view which shows some cross sections, such as a cutting unit, (a), (b) has shown the state from which the rotation position of the cutting unit differed, respectively. It is an enlarged view of the principal part of the cutting tip for resin of a cutting unit, and the cutting tip for inserts. It is an enlarged view of the principal part which shows the cutting device when performing the cutting process to the intermediate body for manufacture, and has shown one part by the cross section. It is a figure for demonstrating the urging | biasing mechanism provided in the cutting unit of a cutting device, Comprising: It is a figure which shows some cutting units etc. in a cross section. It is a figure for demonstrating the action | operation of a biasing mechanism, Comprising: It is a figure which shows some cutting units etc. in a cross section. It is a figure for demonstrating the action | operation of a biasing mechanism, Comprising: It is a figure which shows some cutting units etc. in a cross section. It is a bottom view of the cutting unit of the cutting device concerning a 2nd embodiment of the present invention. It is an enlarged view of the cutting blade for resin of the cutting unit which concerns on 2nd Embodiment, and the cutting blade for inserts. It is a typical side view for demonstrating the cutting operation of the manufacturing intermediate body using the cutting device which concerns on 2nd Embodiment, (a), (b), (c) is rotation of a cutting unit, respectively. The positions are different. It is a figure for demonstrating the urging mechanism provided in the cutting unit of the cutting device which concerns on a modification, Comprising: It is a figure which shows some cutting units etc. in a cross section. It is a figure for demonstrating the action | operation of the urging | biasing mechanism which concerns on a modification, Comprising: It is a figure which shows some cutting units etc. in a cross section. It is a figure for demonstrating the action | operation of the urging | biasing mechanism which concerns on a modification, Comprising: It is a figure which shows some cutting units etc. in a cross section.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In addition, this invention can be widely applied as a cutting device which can remove an unnecessary resin part among intermediates for manufacture of a resin molded product using cutting. Further, in the present embodiment, a description will be given taking as an example a molded product in which the core metal is an insert.

  FIG. 1 is a schematic cross-sectional view of an intermediate 100 for manufacturing a molded product 101 and a molded product 101 according to an embodiment of the present invention. FIG. 2 is a side view of the main part of the cutting device 1 according to one embodiment of the present invention, and shows a part in cross section. FIG. 3 is a bottom view of the cutting unit 5 of the cutting apparatus 1.

  FIG. 4 is a side view showing a part of the cutting unit 5 or the like in cross section. FIGS. 4A and 4B show states where the rotational position of the cutting unit 5 is different. FIG. 5 is an enlarged view of the main parts of the cutting tip for resin 20 and the cutting tip for insert 30 of the cutting unit 5. FIG. 6 is a side view of the main part showing the cutting apparatus 1 when the manufacturing intermediate 100 is subjected to cutting processing, and a part thereof is shown in cross section.

  With reference to FIG. 1, the molded product 101 is completed by cutting the manufacturing intermediate 100 and removing a gate portion 106 described later from the manufacturing intermediate 100. The production intermediate 100 is completed through (1) an insert forming step, (2) an insert cleaning step, (3) an insert preheating step, and (4) an injection molding step.

  The insert forming step (1) is a step of forming the insert 103 by applying a process such as forging or cutting to a metal material. The insert cleaning step (2) is a step of cleaning and degreasing the insert 103 with a cleaning liquid such as alcohol. The insert preheating step (3) is a pre-step of the injection molding step and is a step of heating the insert 103 to a predetermined temperature.

  The injection molding step (4) is a step in which the insert 103 is set in the cavity of a mold (not shown) and the molten resin is injected from the gate 200 of the mold toward the cavity. Through these steps, the production intermediate 100 is completed. As described above, the molded product 101 is completed by cutting the manufacturing intermediate 100 and removing the gate portion 106 from the manufacturing intermediate 100.

  The molded product 101 has an insert 103 and a resin portion 104.

  The insert 103 is an integrally formed product made of metal such as steel, and is formed in an annular shape, for example.

  The insert 103 has an inner peripheral portion 103a, an intermediate portion 103b, an outer peripheral portion 103c, one side surface 103d, and another side surface 103e.

  The inner peripheral portion 103a is a portion formed in a cylindrical shape. One end portion of the inner peripheral portion 103a is continuous with the intermediate portion 103b. The intermediate part 103b is a plate-like part formed in a disk shape. The intermediate portion 103b is continuous with the outer peripheral portion 103c. The outer peripheral portion 103c is formed in an annular bowl shape. In the molded product 101, a resin portion 104 is formed over the intermediate portion 103b and the outer peripheral portion 103c.

  The resin part 104 is a synthetic resin part. As this synthetic resin, a thermoplastic resin (for example, 66 nylon etc.) can be illustrated. The resin portion 104 is formed in an annular shape, is arranged so as to embed the outer peripheral portion 103c of the insert 103, and so as to bury the outer peripheral side portion of one side surface (one side surface 103d) of the intermediate portion 103b. Has been placed. The resin portion 104 is formed by injecting molten resin into a cavity where the insert 103 is disposed.

  The inner peripheral portion of the resin portion 104 is in contact with one side surface 103 d of the insert 103. Further, the outer peripheral portion of the resin portion 104 sandwiches the outer peripheral portion 103 c of the insert 103 in the axial direction of the molded product 101. Further, the outer peripheral surface of the outer peripheral portion 103c of the insert 103 is enhanced in binding force with the resin portion 104 by knurling or the like. One side surface 103d of the insert 103 is formed on a smooth surface, and the bonding force with the resin portion 104 is weak. For this reason, a relatively small pulling force acts between the resin portion 104 and the one side surface 103d, thereby releasing the connection between the contact portions of the resin portion 104 and the one side surface 103d.

  Here, the difference between the manufacturing intermediate 100 and the molded product 101 is the presence or absence of the gate portion 106. The gate unit 106 is an example of the “first predetermined portion” in the present invention. The manufacturing intermediate 100 has a gate portion 106 in addition to the configuration of the molded product 101. The gate portion 106 is a portion formed by injecting resin into the space around the gate 200 in the cavity of the mold.

  The gate portion 106 is an umbrella-shaped portion that is disposed so as to cover the inner peripheral side portion of the side surface 103 d of the insert 103. Note that, in the manufacturing intermediate 100, a portion other than the gate portion 106 is an intermediate body 105. The intermediate body 105 is an example of the “part other than the first predetermined part in the production intermediate” of the present invention. The molded product 101 is completed by removing the gate portion 106 from the intermediate body 105 by the cutting device 1. Next, the cutting device 1 will be described.

  2 to 6, the cutting apparatus 1 manufactures a molded product 101 by removing the gate portion 106 of the manufacturing intermediate 100 from the intermediate body 105.

  The cutting device 1 includes a frame 2, a conveying device 3, a work holder 4, a cutting unit 5, an elevating device 6, an electric motor 7, and a gate part extracting device 8.

  The frame 2 is a skeleton portion formed using steel or the like, and supports the transfer device 3 and the like.

  The conveyance device 3 is provided to convey the work holder 4 that holds the production intermediate 100 (molded product 101). The transfer device 3 includes a rail 3a and a base 3b. The rail 3 a extends along the conveyance direction X <b> 1 of the work holder 4 and is fixed to the frame 2. The base 3b is configured to be displaced on the rail 3a along a predetermined transport direction X1. The base 3b is displaced in the transport direction X1 in response to a force applied from an electric motor (not shown), an air cylinder, or a worker.

  The transport device 3 transports the manufacturing intermediate 100 held by the work holder 4 to the cutting unit 5. Then, the conveying device 3 displaces the manufacturing intermediate 100 in which the gate unit 106 is separated from the intermediate body 105 by the cutting process in the cutting unit 5 from the cutting unit 5 along the conveying direction X1, Transport to the drawing device 8.

  The gate part extraction device 8 has a movable arm 8a. The movable arm 8 a is configured to be displaceable with respect to the production intermediate 100 conveyed from the cutting unit 5. Moreover, the gate part extraction device 8 has a holding part 8b such as a suction nozzle. The holding portion 8 b pulls up the gate portion 106 from the intermediate body 105, so that the gate portion 106 is pulled up from the intermediate body 105. Thereby, the molded product 101 is completed. Cutting in the cutting unit 5 on the manufacturing intermediate 100 and pulling out of the gate 106 in the gate pulling device 8 are performed in a state where the manufacturing intermediate 100 is held by the work holder 4.

  The work holder 4 is formed in a substantially cylindrical shape, is connected to the base 3b so as to be integrally movable in the transport direction X1, and extends upward from the base 3b. The work holder 4 has a plurality of divided bodies 4a held by the base 3b. Each divided body 4 a has a holding portion 4 b for holding the inner peripheral portion 103 a of the insert 103 in cooperation. The holding part 4b of each divided body 4a is formed in a hollow shape surrounding the inner peripheral part of the insert 103 as a whole.

  Each divided body 4a is configured to be displaceable in a direction toward each other and a direction away from each other. When the divided bodies 4a are separated from each other by a certain distance, the holding of the insert 103 by the holding portion 4b is released. On the other hand, when the divided bodies 4a are close to each other at a predetermined distance, the holding of the insert 103 by the holding portion 4b is achieved.

  The manufacturing intermediate 100 cuts the outer peripheral portion 106 a of the gate portion 106 and the adjacent portion 103 f as a portion adjacent to the gate portion 106 of the insert 103 by cutting with a relatively small cutting amount by the cutting unit 5. Thus, the gate unit 106 can be separated from the intermediate body 105. In the present embodiment, the adjacent portion 103f refers to a portion of the insert 103 that is aligned with the outer peripheral portion 106a of the gate portion 106 and the insert 103 in the axial direction.

  The cutting unit 5 is disposed above the conveying device 3. The cutting unit 5 is configured to rotate around a predetermined rotation axis S1 extending vertically.

  The cutting unit 5 includes a holder 10, a cutting blade unit 11, and an urging mechanism 12.

  The holder 10 is provided to hold the cutting blade unit 11. The holder 10 is a metal disk-shaped member, for example. The upper part of the holder 10 is connected to the output shaft of the electric motor 7 through a transmission mechanism (not shown) so that power can be transmitted. Thereby, the holder 10 can rotate around the rotation axis S <b> 1 by the output of the electric motor 7.

  The holder 10 is connected to the lifting device 6. The lifting device 6 is, for example, a cylinder device, and has a configuration capable of displacing the holder 10 in the vertical direction. The holder 10 is coupled to the cutting blade unit 11 so as to be integrally rotatable about the rotation axis S1 and integrally movable in the vertical direction.

  The holder 10 has a holder main body 10a and a plurality of claw portions 10b.

  The holder main body 10a constitutes the upper part of the holder 10 and is a part to which the output from the electric motor 7 is input. A plurality of claw portions 10b protrude downward from the outer peripheral portion of the holder body 10a.

  The plurality of claw portions 10 b are provided to fix the cutting blade unit 11. Each nail | claw part 10b is extended toward the downward direction from the outer peripheral part of the holder main body 10a. The plurality of claw portions 10b are arranged at equal intervals (equal pitch) around the rotation axis S1. Each claw portion 10b is formed in a block shape. The cutting blade unit 11 extends downward from the plurality of claw portions 10b.

  The cutting blade unit 11 cuts the outer peripheral portion 106 a of the gate portion 106 of the manufacturing intermediate 100 over the entire area in the thickness direction of the outer peripheral portion 106 a (the vertical direction of the cutting device 1), and one of the inserts 103. The side surface 103d (adjacent portion 103f) is slightly cut. Thereby, the gate part 106 and the intermediate body 105 can be separated.

  The cutting blade unit 11 has a plurality of resin cutting tips 20 and a plurality of insert cutting tips 30.

  In the present embodiment, three cutting tips for resin 20 are provided, and three cutting tips for insert 30 are also provided. The cutting tip for resin 20 and the cutting tip for insert 30 are alternately arranged along the circumferential direction C1 of the rotation axis S1. And the cutting tip 20 for resin and the cutting tip 30 for inserts are arrange | positioned at equal pitch along the circumferential direction C1. The pitch in this case refers to the distance between the centers of the resin cutting tip 20 and the insert cutting tip 30 along the circumferential direction C1.

  The resin cutting tip 20 is provided to cut the outer peripheral portion 106a of the gate portion 106 of the manufacturing intermediate 100 while being held by the holder 10 and rotating around the rotation axis S1. In the present embodiment, the resin cutting tips 20 are arranged at intervals of 120 ° in the circumferential direction C1. The resin cutting tip 20 is formed using a steel cutting tip.

  The resin cutting tip 20 is formed on the corresponding claw portion 10b using a fixing member such as a screw. Thereby, the cutting tip 20 for resin is arrange | positioned at the outer peripheral part of the holder 10. FIG. The resin cutting tip 20 is formed in a plate shape having a predetermined thickness when viewed in the radial direction R1 of the rotation axis S1. Further, the resin cutting tip 20 is formed in a diamond shape when viewed in the circumferential direction C1. The lower portion of the resin cutting tip 20 has a resin cutting blade 20a. The cutting edge 20b is located at the lower end of the resin cutting blade 20a. The cutting tip for resin 20 is a double-edged blade, and a blade surface is formed on each of the inner surface and the outer surface in the radial direction R1.

  The insert cutting tip 30 is provided to turn the adjacent portion 103f of the insert 103 adjacent to the gate portion 106 while being held by the holder 10 and rotating around the rotation axis S1. The adjacent portion 103f is an example of the “second predetermined portion” in the present invention. That is, the insert cutting tip 30 is configured to cut a portion of the insert 103 that comes into contact with the gate portion 106.

  The adjacent portion 103f is a portion adjacent to the outer peripheral portion 106a of the gate portion 106 in one side surface 103d of the insert 103. The depth range of the adjacent portion 103f is, for example, about several tens of μm from one side surface 103d of the insert 103. In this manner, the insert cutting tip 30 cuts the adjacent portion 103f of the insert 103, whereby more reliable separation of the gate portion 106 and the intermediate body 105 can be realized.

  In this embodiment, the insert cutting tips 30 are arranged at intervals of 120 ° in the circumferential direction C1. The insert cutting tip 30 is formed using a steel cutting tip. The insert cutting tip 30 is formed using a fixing member such as a screw on the corresponding claw portion 10b. Thereby, the cutting tip 30 for insert is arrange | positioned at the outer peripheral part of the holder 10. FIG.

  The insert cutting tip 30 is formed in a plate shape having a predetermined thickness when viewed in the radial direction R1 of the rotation axis S1. Further, the insert cutting tip 30 is formed in a diamond shape when viewed in the circumferential direction C1. The lower part of the insert cutting tip 30 has an insert cutting blade 30a. The blade tip 30b is located at the lower end of the insert cutting blade 30a. The insert cutting tip 30 is a double-edged blade, and a blade surface is formed on each of the inner surface and the outer surface in the radial direction R1. With respect to the radial direction R1, the center position of the insert cutting tip 30 and the center position of the resin cutting tip 20 are aligned.

  The insert cutting tip 30 cuts the metal insert 103. On the other hand, the resin cutting tip 20 cuts the synthetic resin resin portion 104 having a strength lower than that of the metal. For this reason, in this embodiment, the strength of the cutting tip for insert 30 is set higher than the strength of the cutting tip for resin 20.

  The cutting tip 20 for resin cuts the gate part 106 which faces the cutting unit 5 side among the intermediate bodies 100 for manufacture. On the other hand, the insert cutting tip 30 cuts the adjacent portion 103 f located on the back side of the gate portion 106. For this reason, the protruding amount P30 of the cutting tip 30 for insert from the holder 10 toward the manufacturing intermediate 100 is larger than the protruding amount P20 of the resin cutting tip 20 from the holder 10 toward the manufacturing intermediate 100. It is set (P30> P20).

  The difference (P30−P20) between the protrusion amounts P20 and P30 is set to about 0.2 mm, which corresponds to the radius of curvature of the blade edge 20b, for example. With such a configuration, the resin cutting tip 20 contacts the outer peripheral portion 106 a of the gate portion 106, but does not contact the insert 103. Further, the insert cutting tip 30 contacts the adjacent portion 103 f of the insert 103.

  Further, the insert cutting tip 30 is for cutting the metal insert 103 and is not for cutting the resin portion 104. For this reason, it is preferable that the cutting tip 30 for inserts avoids the contact with the resin part 104 as much as possible. Therefore, in the present embodiment, the width of the cutting edge 30b of the insert cutting tip 30 is set to be smaller than the width of the cutting edge 20b of the resin cutting tip 20 in the radial direction R1.

  More specifically, the radius of curvature r30 of the cutting edge 30b of the cutting tip for insert 30 when set along the circumferential direction C1 is set smaller than the radius of curvature r20 of the cutting edge 20b of the cutting tip for resin 20. (R30 <r20). In the present embodiment, the radius of curvature r30 is about 0.2 mm, and the radius of curvature r20 is about 0.4 mm. Thereby, the cutting edge 30b of the cutting tip 30 for inserts is sharper than the cutting edge 20b of the cutting tip 20 for resin.

  Further, when viewed from the circumferential direction C1, the angle (blade angle θ30) at the blade edge 30b of the insert cutting tip 30 is set to be smaller than the angle (blade angle θ20) at the blade edge 20b of the resin cutting tip 20 (θ30). <Θ20). The blade angle θ30 in this case refers to an angle formed by the inner surface and the outer surface of the cutting edge 30b of the insert cutting tip 30 that are aligned in the radial direction R1. Further, the blade angle θ20 refers to an angle formed by the inner side surface and the outer side surface aligned in the radial direction R1 in the cutting edge 20b of the cutting tip 20 for resin.

  In the present embodiment, the blade angle θ30 is set to about 35 °. Further, the blade angle θ20 is set to about 55 °. Thus, in this embodiment, the blade angle θ30 is set smaller than ½ of 90 °, and the blade angle θ20 is set larger than ½ of 90 °.

  The biasing mechanism 12 shown in FIG. 2 is provided as a mechanism capable of biasing the gate portion 106 toward the side opposite to the holder 10 side when the resin cutting blade 20a turns the gate portion (first predetermined portion) 106. It has been. FIG. 7 is a view for explaining the urging mechanism 12 provided in the cutting unit 5, and is a view showing a part of the cutting unit 5 and the like in cross section. 8 and 9 are views for explaining the operation of the urging mechanism 12 and are views showing a part of the cutting unit 5 and the like in cross section.

  The urging mechanism 12 is attached to the holder 10. Further, the urging mechanism 12 is disposed on the lower surface side of the holder main body 10a. That is, the urging mechanism 12 is disposed on the holder 10 on the side facing the manufacturing intermediate 100. And the biasing mechanism 12 is arrange | positioned in the radial direction inner side of the holder main body 10a with respect to the some nail | claw part 10b arrange | positioned at the outer peripheral part of the holder main body 10a.

  As shown in FIGS. 7 to 9, the urging mechanism 12 includes an urging plate 40 and a plurality of urging springs 50.

  The urging plate 40 is provided as a disk-shaped member that can come into contact with the gate portion 106 when the resin cutting blade 20 a turns the gate portion 106. More specifically, the urging plate 40 is configured such that the lower surface of the urging plate 40 can come into contact with the upper surface of the gate portion 106 when the resin cutting blade 20 a turns the gate portion 106. Further, the urging plate 40 is held with respect to the holder main body 10 a via a plurality of urging springs 50.

  The plurality of biasing springs 50 hold the biasing plate 40 against the holder 10. Each of the plurality of urging springs 50 moves the urging plate 40 toward the side opposite to the holder 10 when the resin cutting blade 20a turns the gate portion 106 (that is, the urging plate 40 is used for manufacturing). It is provided as a coil spring that can be biased (toward the intermediate body 100 side).

  FIG. 7 shows a state before the cutting blade unit 11 cuts the outer peripheral portion 106 a of the gate portion 106. FIG. 8 shows a state where the cutting blade unit 11 cuts the outer peripheral portion 106a of the gate portion 106 (that is, a state where the cutting blade 20a for resin turns the gate portion 106). FIG. 9 shows that the cutting of the outer peripheral portion 106a of the gate portion 106 by the cutting blade unit 11 is completed, the holder 10 and the cutting blade unit 11 are moved upward by driving by the lifting device 6, and the cutting blade unit 11 is an intermediate for manufacturing. A state separated from 100 is shown.

  In the state shown in FIG. 7, the urging plate 40 is held in a state suspended from the holder 10 by the urging spring 50, and is not in contact with the gate portion 106. Further, in this state, the urging spring 50 is in a state of extending according to its own weight and the weight of the urging plate 40. Next, the holder 10 and the cutting blade unit 11 are driven by the lifting device 6 so as to move downward. When the holder 10 and the cutting blade unit 11 move downward to a predetermined position, the transmission unit 7 rotates the cutting unit 5. Thereby, cutting of the outer peripheral part 106a of the gate part 106 by the cutting blade unit 11 is performed.

  Energizing at any timing from when the holder 10 and the cutting blade unit 11 are moved downward to a predetermined position until the outer peripheral portion 106a of the gate portion 106 is being cut by the cutting blade unit 11 The lower surface of the plate 40 contacts the upper surface of the gate portion 106. When the urging plate 40 comes into contact with the gate portion 106, the urging spring 50 is compressed by a reaction force acting from the gate portion 106 side. Then, in a state where the cutting blade unit 11 cuts the outer peripheral portion 106a of the gate portion 106, as shown in FIG. 8, the biasing plate 40 is moved by the spring force of the biasing spring 50 in a compressed state. 106 is pressed against.

  When cutting of the outer peripheral portion 106a of the gate portion 106 by the cutting blade unit 11 is completed and the holder 10 and the cutting blade unit 11 start to move upward by driving by the lifting device 6, the biasing spring 50 in a compressed state is used. The state where the biasing plate 40 is biased is maintained. Accordingly, the resin cutting blade 20 a is separated from the gate portion 106 in a state where the urging plate 40 is pressed against the upper surface of the gate portion 106. When the holder 10 and the cutting blade unit 11 are moved further upward in a state where the resin cutting blade 20a is separated from the gate portion 106, the compressed state of the biasing spring 50 is released. Then, after the resin cutting blade 20 a is separated from the gate portion 106, the biasing plate 40 is separated from the upper surface of the gate portion 106. That is, when the holder 10 is lifted after the gate portion 106 is cut, the biasing plate 40 pushes the gate portion 106 downward from the holder 10 side by the spring force of the biasing spring 50 in the compressed state. The gate portion 106 is removed from the holder 10 side. As a result, the state shown in FIG. 9 is obtained.

  As described above, according to the present embodiment, when the cutting blade unit 11 is separated from the manufacturing intermediate 100, a state in which the gate portion 106 is attached to the resin cutting blade 20a on the holder 10 side may occur. Absent. The gate 106 is left on the intermediate body 105 side while being disposed on the intermediate body 105 held by the work holder 4.

  The above is the schematic configuration of the cutting apparatus 1. In the cutting operation of the manufacturing intermediate 100 by the cutting device 1, as well shown in FIGS. 2 and 6, the cutting blade unit 11 is moved by the lifting device 6 as described above. Is lowered toward. In this state, the cutting unit 5 is rotated by the electric motor 7. Thereby, the cutting tip 20 for resin cuts the outer peripheral part 106a of the gate part 106 of the intermediate body 100 for manufacture. Further, the insert cutting tip 30 rotates around the rotation axis S1 while passing through the space around the outer peripheral portion 106a formed by cutting with the resin cutting tip 20, and the adjacent portion 103f of the insert 103 is rotated. To cut.

  As described above, according to the cutting apparatus 1 according to the present embodiment, the resin cutting blade 20a cuts the resin gate portion 106 of the manufacturing intermediate 100. The insert cutting blade 30 a cuts the adjacent portion 103 f adjacent to the gate portion 106. With such a configuration, the resin cutting blade 20a only needs to cut the resin portion 104, and does not need to cut the metal insert 103. Therefore, since the breakage of the resin cutting blade 20a can be suppressed, the life of the resin cutting blade 20a can be further extended. Further, most of the resin gate portion 106 existing in the movement path of the insert cutting blade 30a is cut by the resin cutting blade 20a. Thereby, since the cutting blade 30a for inserts can reduce markedly the quantity which cuts the resin-made gate parts 106, and the quantity which contacts the gate part 106, the abrasion of the said cutting blade 30a for inserts can be suppressed. Furthermore, since the cutting blade 30a for inserts is restrained from sliding frictionally with the gate portion 106 (resin), it becomes difficult to generate heat, and deterioration of the cutting blade 30a for inserts can be suppressed. That is, the life of the insert cutting blade 30a can be further extended.

  As described above, in the cutting apparatus 1 that also cuts a part of the insert 103 when the gate portion 106 as an unnecessary portion made of resin is removed by cutting, the life of the cutting blades 20b and 30b is made longer. Can do.

  Moreover, according to the cutting device 1, the strength of the cutting blade for insert 30a is set higher than the strength of the cutting blade for resin 20a. According to this configuration, wear of the insert cutting blade 30a can be further suppressed in cutting the manufacturing intermediate 100 in which the strength of the adjacent portion 103f of the insert 103 is larger than the strength of the resin gate portion 106. Therefore, the lifetime of the cutting blade 30a for insert can be made longer.

  Further, according to the cutting device 1, the protrusion amount P30 of the insert cutting blade 30a from the holder 10 toward the manufacturing intermediate 100 is equal to that of the resin cutting blade 20a from the holder 10 toward the manufacturing intermediate 100. It is set to be larger than the protrusion amount P20. According to this configuration, the resin cutting blade 20a is more reliably suppressed from coming into contact with the insert 103 positioned on the back side of the resin gate portion 106. Therefore, it can suppress more reliably that the cutting blade 20a for resin wears by contact with the insert 103. FIG.

  Moreover, according to the cutting device 1, the width of the cutting edge 30b of the cutting blade for insert 30a is set smaller than the width of the cutting edge 20b of the cutting blade for resin 20a with respect to the radial direction R1 of the rotation axis S1. According to this configuration, the resin cutting blade 20a cuts the gate portion 106, whereby a wide space in the radial direction R1 of the rotation axis S1 is formed. And the cutting blade 30a for inserts cuts the adjacent part 103f of an insert in the state by which abrasion and heat_generation | fever by contact with the gate part 106 (resin part 104) were suppressed by passing through this wide space. be able to. Thereby, the lifetime of the cutting blade 30a for inserts can be made longer.

  Further, according to the cutting device 1, the radius of curvature r30 of the cutting edge 30b of the cutting blade for insert 30a when viewed along the circumferential direction C1 of the rotation axis S1 is greater than the radius of curvature r20 of the cutting edge 20b of the cutting blade for resin 20a. Is set too small. According to this structure, the cutting edge 30b of the cutting blade 30a for insert can be made into a sharper shape. Thereby, it can suppress that a big level | step difference arises in one side 103d of the insert 103 cut with the cutting blade 30a for inserts, and can suppress that a burr | flash arises in one side 103d of the insert 103. Therefore, the molded article 101 can be finished in a more beautiful state.

  Further, according to the cutting device 1, a plurality of the resin cutting blades 20a and the insert cutting blades 30a are provided in a plurality, and are alternately arranged around the rotation axis S1. According to this structure, the load which acts on each cutting blade 20a for resin and each cutting blade 30a for insert can be made more equal. Therefore, the lifetime as each resin cutting blade 20a and each insert cutting blade 30a can be made longer.

  Further, according to the cutting device 1, the turned gate portion 106 is urged by the urging mechanism 12 to the side opposite to the holder 10 side. For this reason, after the turning, when the holder 10 is separated from the manufacturing intermediate 100, the gate portion 106 separated from the manufacturing intermediate 100 by turning adheres to the resin cutting blade 20 a held by the holder 10. Occurrence of the state that remains is easily prevented. Then, since the separated gate portion 106 is prevented from adhering to the resin cutting blade 20 on the holder 10 side, when the next manufacturing intermediate 100 is cut by the cutting device 1, the previous cutting is performed. The gate portion 106 generated sometimes does not hinder the cutting operation of the next manufacturing intermediate 100. Thereby, the smooth process at the time of cutting the some manufacturing intermediate body 100 continuously in order is realizable.

  Further, according to the cutting device 1, the biasing mechanism 12 that prevents the gate portion 106 separated from the manufacturing intermediate 100 from adhering to the resin cutting blade 20 a on the holder 10 side is provided with the biasing plate 40. This can be easily realized with a simple structure using the biasing spring 50.

[Second Embodiment]
FIG. 10 is a bottom view of the cutting unit 5A of the cutting apparatus 1A according to the second embodiment of the present invention. FIG. 11 is an enlarged view of the resin cutting blades 21 a and 22 a of the resin cutting tips 21 and 22 of the cutting unit 5 </ b> A and the insert cutting blade 30 a of the insert cutting chip 30. FIG. 12 is a schematic side view for explaining the cutting operation of the manufacturing intermediate 100 using the cutting apparatus 1A. FIGS. 12A, 12B, and 12C are respectively views of the cutting unit 5A. The rotational positions are different.

  In the following description, a configuration different from the configuration of the first embodiment will be mainly described, and the same configurations as those of the first embodiment will be denoted by the same reference numerals in the drawings, and description thereof will be omitted.

  With reference to FIGS. 10 to 12, the manufacturing intermediate 100 has the configuration described in the first embodiment. Thereby, in the resin part 104 of the intermediate body 100 for manufacture, the part other than the gate part 106 and the gate part 106 are arranged so as to be arranged along the radial direction R1. The cutting unit 5 </ b> A is configured to cut a boundary portion between the gate portion 106 and a portion other than the gate portion 106 in the resin portion 104.

  The cutting unit 5A has a holder 10 and a cutting blade unit 11A.

  The cutting blade unit 11 </ b> A has a plurality of first resin cutting tips 21, a plurality of second resin cutting tips 22, and a plurality of insert cutting tips 30.

  In the present embodiment, two first resin cutting tips 21, second resin cutting tips 22, and insert cutting tips 30 are provided. That is, the cutting blade unit 11A has six cutting tips. The first resin cutting tip 21, the second resin cutting tip 22, and the insert cutting tip 30 are sequentially arranged along the circumferential direction C1 of the rotation axis S1. The first resin cutting tip 21, the second resin cutting tip 22, and the insert cutting tip 30 are arranged at an equal pitch along the circumferential direction C1 of the rotation axis S1.

  The first resin cutting tip 21 and the second resin cutting tip 22 have the same configuration as the resin cutting tip 20 of the first embodiment, except for the configuration described below. Yes.

  The difference between the configuration of the second resin cutting tip 22 and the configuration of the first resin cutting tip 21 is mainly due to the difference between the shape of the first resin cutting blade 21a and the shape of the second resin cutting tip 22a. is there.

  A lower portion of the first resin cutting tip 21 has a first resin cutting blade 21a. The cutting edge 21b is located at the lower end of the first resin cutting blade 21a. Moreover, the lower part of the cutting tip 22 for 2nd resin has the cutting blade 22a for 2nd resin. The cutting edge 22b is located at the lower end of the second resin cutting blade 22a.

  The center position of the second resin cutting blade 22a is located more inward in the radial direction R1 than the center position of the first resin cutting blade 21a. In other words, with respect to the radial direction R1, the position of the cutting edge 22b of the second resin cutting blade 22a is set on the gate portion 106 side with respect to the position of the cutting edge 21b of the first resin cutting blade 21a. In the present embodiment, the second resin cutting blade 22a, the insert cutting blade 30a, and the first resin cutting blade 21a are arranged in this order from the inside toward the outside in the radial direction R1. The distance between the center position of the first resin cutting blade 21a and the center position of the second resin cutting blade 22a in the radial direction R1 is set to about the radius of curvature r30 of the insert cutting blade 30a.

  The first resin cutting blade 21a is formed as a single blade that faces a portion of the resin portion 104 other than the gate portion 106 (outward in the radial direction R1). Of the outer peripheral portion 106a of the gate portion 106, the gate portion The part other than 106 is cut. That is, the blade surface is formed on the outer surface 21c (one side surface) of the first resin cutting blade 21a in the radial direction R1. On the other hand, the second resin cutting blade 22 a is formed as a single blade facing the gate portion 106 side of the resin portion 104, and cuts a portion of the outer peripheral portion 106 a of the gate portion 106 on the gate portion 106 side. That is, a blade surface is formed on the inner side surface 22c (other side surface) of the second resin cutting blade 22a in the radial direction R1.

  The meaning that the resin cutting blades 21a and 22a are single blades means that only one of the pair of side surfaces in the radial direction R1 of the resin cutting blades 21a and 22a is in contact with the resin portion 104 in a pressurized state. This means that the resin cutting blades 21a and 22a themselves may be double-edged.

  The protruding amount P21 of the first resin cutting blade 21a from the holder 10 toward the manufacturing intermediate 100 is larger than the protruding amount P22 of the second resin cutting blade 22a from the holder 10 toward the manufacturing intermediate 100. It is set large (P21> P22). A difference (P21−P22) between the protrusion amounts P21 and P22 is set to, for example, a curvature radius r30 (for example, about 0.2 mm) of the cutting blade 30a for insert. With such a configuration, the cutting depth of the first resin cutting tip 21 is larger than the cutting depth of the second resin cutting blade 22a.

  Regarding the radial direction R1, the width of the cutting edge 21b of the first resin cutting blade 21a is set to be smaller than the width of the cutting edge 22b of the second resin cutting blade 22a.

  More specifically, the curvature radius r21 of the cutting edge 21b of the first resin cutting blade 21a when viewed along the circumferential direction C1 is smaller than the curvature radius r22 of the cutting edge 22b of the second resin cutting blade 22a. It is set (r21 <r22). In the present embodiment, the radius of curvature r21 is about 0.02 mm, and the radius of curvature r22 is about 0.2 mm. As a result, the cutting edge 21b of the first resin cutting blade 21a is sharper than the cutting edge 22b of the second resin cutting blade 22a.

  As described above, according to the cutting apparatus 1 </ b> A according to the present embodiment, the cutting operation of the gate portion 106 that is the resin portion can be performed separately on the gate portion 106 side and the portion side other than the gate portion 106. . More specifically, in each of the first resin cutting blade 21a and the second resin cutting blade 22a, one of the pair of side surfaces (the inner side surface 21c and the outer side surface 22c) is in contact with the resin portion 104. However, the other is not substantially in contact with the resin portion 104. For this reason, compared with the case where the gate part 106 is cut with one resin cutting blade, the contact amount of each resin cutting blade 21a, 22a and the resin part 104 can be halved. Thereby, since the heat generated by sliding between the resin cutting blades 21a and 22a and the resin portion 104 can be remarkably reduced, the life of the resin cutting blades 21a and 22a can be further extended.

  Further, according to the cutting device 1A, the width of the cutting edge 21b of the first resin cutting blade 21a is set smaller than the width of the cutting edge 22b of the second resin cutting blade 22a in the radial direction R1. According to this configuration, the cutting edge 21b of the first resin cutting blade 21a can be made to have a sharper shape. Thereby, it can suppress that a big level | step difference arises on the surface of parts other than the gate part 106 in the intermediate body 100 for manufacture cut with the cutting blade 21a for 1st resin, and it suppresses that a burr | flash produces on the said surface. it can. Therefore, the molded article 101 can be finished in a more beautiful state.

  Further, according to the cutting device 1A, with respect to the radial direction R1, the position of the cutting edge 22b of the second resin cutting blade 22a is set on the gate portion 106 side with respect to the position of the cutting edge 21b of the first resin cutting blade 21a. Yes. According to this structure, it can suppress that a big level | step difference arises in the surface of parts other than the gate part 106 in the intermediate body 100 for manufacture cut with the cutting blade 21a for 1st resin, and a burr | flash produces on the said surface. Can be suppressed. Therefore, the molded article 101 can be finished in a more beautiful state.

  Further, according to the cutting device 1A, the curvature radius r21 of the cutting edge 21b of the first resin cutting blade 21a when viewed along the circumferential direction C1 is greater than the curvature radius r22 of the cutting edge 22b of the second resin cutting blade 22a. Is set too small. According to this configuration, the cutting edge 21b of the first resin cutting blade 21a can be made to have a sharper shape. Thereby, it can suppress that a big level | step difference arises on the surface of parts other than the gate part 106 in the intermediate body 100 for manufacture cut with the cutting blade 21a for 1st resin, and it suppresses that a burr | flash produces on the said surface. it can. Therefore, the molded article 101 can be finished in a more beautiful state.

  Further, according to the cutting device 1A, the protrusion amount P21 of the first resin cutting blade 21a from the holder 10 toward the manufacturing intermediate 100 is the second resin cutting from the holder 10 toward the manufacturing intermediate 100. It is set larger than the protrusion amount P22 of the blade 22a. According to this configuration, the first resin cutting blade 21a can remove the burrs around the gate portion 106 more neatly.

  As mentioned above, although embodiment of this invention was described, this invention is not restricted to the above-mentioned embodiment, As long as it described in the claim, it can change and implement variously.

  (1) For example, in the above-described embodiment, the embodiment in which the metal insert 103 is used has been described as an example. However, this need not be the case. The material of the insert 103 is not limited as long as the strength of the insert 103 is greater than the strength of the resin portion 104.

  (2) In the above-described embodiment, an example in which the outer periphery 106a as a part of the gate portion 106 is cut has been described. However, this need not be the case. The entire gate portion 106 may be removed from the intermediate body 105 by cutting.

  (3) In addition, the cutting device of this invention should just have a holder, the cutting blade for resin, and the cutting blade for insert, and it is not limited about the presence or absence of another structure.

  (4) In the above-described first embodiment, as an example of the form of the urging mechanism, the form including the urging plate and the urging spring has been described as an example, but this need not be the case. For example, you may implement the modification shown in FIG. 13 thru | or FIG.

  FIG. 13 is a view for explaining an urging mechanism 12A provided in the cutting unit 5B of the cutting apparatus 1B according to the modification, and is a view showing a part of the cutting unit 5B and the like in cross section. 14 and 15 are views for explaining the operation of the urging mechanism 12A according to the modification, and are a view showing a part of the cutting unit 5B and the like in cross section.

    In the following, the configuration different from the configuration of the first embodiment will be mainly described, and the configuration similar to the configuration of the first embodiment is denoted by the same reference numerals as those of the first embodiment in the drawings, or The description is omitted by citing the same reference numerals as those in the embodiment.

  The biasing mechanism 12A shown in FIGS. 13 to 16 can bias the gate portion 106 toward the side opposite to the holder 10 side when the resin cutting blade 20a turns the gate portion (first predetermined portion) 106. It is provided as a mechanism. The urging mechanism 12 </ b> A is attached to the holder 10. The biasing mechanism 12 </ b> A includes a biasing plate 41 and a biasing cylinder mechanism 51.

  The urging plate 41 is provided as a disk-shaped member that can come into contact with the gate portion 106 when the resin cutting blade 20 a turns the gate portion 106. The urging plate 41 is disposed on the lower surface side of the holder body 10a. That is, the urging plate 41 is disposed on the holder 10 on the side facing the manufacturing intermediate 100. Further, the biasing plate 41 is disposed on the radially inner side of the holder main body 10a with respect to the plurality of claw portions 10b disposed on the outer peripheral portion of the holder main body 10a. The urging plate 40 is configured such that the lower surface of the urging plate 40 can be brought into contact with the upper surface of the gate portion 106 in a state where the resin cutting blade 20 a has turned the gate portion 106. The urging plate 41 is held by the urging cylinder mechanism 51 on the lower surface side of the holder body 10a.

  The urging cylinder mechanism 51 is provided as an air cylinder mechanism or a hydraulic cylinder mechanism, for example. The urging cylinder mechanism 51 includes a cylindrical cylinder body (not shown) and a rod 52 that is supported so as to be able to expand and contract with respect to the cylinder body. Further, the urging cylinder mechanism 51 is configured as a cylinder mechanism that can urge the urging plate 41 toward the side opposite to the holder 10 side when the resin cutting blade 20a turns the gate portion 106. More specifically, the rod 52 is provided so as to extend from a cylinder body (not shown) downward (that is, toward the manufacturing intermediate 100 side). The urging cylinder mechanism 51 holds the urging plate 41 attached to the rod 52 by the rod 52 extending from the cylinder body when the resin cutting blade 20a turns the gate portion 106. It is comprised so that it may bias toward the opposite side to 10 side.

  The cylinder body of the urging cylinder mechanism 51 is held by the holder 10. And the rod 52 of the urging cylinder mechanism 51 is arrange | positioned in the state which penetrated the center part in the radial direction with respect to the holder main body 10a, for example. A biasing plate 41 is attached to the end of the rod 52 on the front end side (the end on the front end side extending from the cylinder main body and the end opposite to the cylinder main body). When the rod 52 extends and retracts with respect to the cylinder body, the biasing plate 41 is displaced relative to the holder 10 along the vertical direction.

  FIG. 13 shows a state before the cutting blade unit 11 cuts the outer peripheral portion 106 a of the gate portion 106. FIG. 14 shows a state where the cutting blade unit 11 cuts the outer peripheral portion 106a of the gate portion 106 (that is, a state where the cutting blade 20a for resin turns the gate portion 106). FIG. 15 shows that the cutting of the outer peripheral portion 106a of the gate portion 106 by the cutting blade unit 11 is completed, the holder 10 and the cutting blade unit 11 are moved upward by driving by the lifting device 6, and the cutting blade unit 11 is an intermediate for manufacturing. A state separated from 100 is shown.

  In the state shown in FIG. 13, the cylinder mechanism 51 is in a state in which the rod 52 is retracted into the cylinder body. In this state, the biasing plate 41 is located in the vicinity of the lower surface side of the holder body 10a. The lower surface of the urging plate 41 is located sufficiently above the position of the cutting edge 20b of the resin cutting blade 20a. For this reason, when the rod 52 is retracted to the cylinder body, the biasing plate 41 moves to the gate portion 106 even when the holder 11 is lowered and the cutting edge 20b of the resin cutting blade 20a is in contact with the gate portion 106. It arrange | positions so that it may not contact | abut.

  From the state shown in FIG. 13, the holder 10 and the cutting blade unit 11 are driven by the lifting device 6 so as to move downward. When the holder 10 and the cutting blade unit 11 move downward to a predetermined position, the transmission unit 7 rotates the cutting unit 5. Thereby, cutting of the outer peripheral part 106a of the gate part 106 by the cutting blade unit 11 is performed.

  When the cutting of the outer peripheral portion 106a of the gate portion 106 by the cutting blade unit 11 is completed, the cylinder mechanism 51 is operated, and the rod 52 extends with respect to the cylinder body. As shown in FIG. 14, the lower surface of the urging plate 41 contacts the upper surface of the gate portion 106. Thereby, in a state where the cutting blade unit 11 cuts the outer peripheral portion 106 a of the gate portion 106, the urging plate 41 acts on the gate portion 106 by the pressing force by the rod 52, that is, the urging force by the cylinder mechanism 51. Pressed.

  When the cutting of the outer peripheral portion 106 a of the gate portion 106 by the cutting blade unit 11 is completed and the rod 52 extends from the cylinder body and the urging plate 41 contacts the gate portion 106, the holder 10 is then driven by the lifting device 6. And the cutting blade unit 11 moves upward. When the holder 10 and the cutting blade unit 11 begin to move upward, the state where the extended rod 52 urges the urging plate 41 is maintained. As a result, the resin cutting blade 20 a is separated from the gate portion 106 in a state where the urging plate 41 is pressed against the upper surface of the gate portion 106. When the holder 10 and the cutting blade unit 11 move further upward in a state where the resin cutting blade 20 a is separated from the gate portion 106, the biasing plate 41 is also separated from the gate portion 106. That is, after the resin cutting blade 20 a is separated from the gate portion 106, the biasing plate 41 is separated from the upper surface of the gate portion 106. As described above, according to this modification, when the holder 10 is lifted after the gate portion 106 is cut, the biasing plate 41 pushes the gate portion 106 downward from the holder 10 side by the biasing force of the cylinder mechanism 51. In this way, the gate portion 106 is removed from the holder 10 side. As a result, the state shown in FIG. 15 is obtained.

  As described above, according to the present modification, in a state where the cutting blade unit 11 is separated from the manufacturing intermediate 100, a state in which the gate portion 106 is attached to the resin cutting blade 20a on the holder 10 side may occur. Absent. The gate 106 is left on the intermediate body 105 side while being disposed on the intermediate body 105 held by the work holder 4.

  As described above, according to the cutting apparatus 1B, the turned gate portion 106 is urged to the side opposite to the holder 10 side by the urging mechanism 12A. For this reason, after the turning, when the holder 10 is separated from the manufacturing intermediate 100, the gate portion 106 separated from the manufacturing intermediate 100 by turning adheres to the resin cutting blade 20 a held by the holder 10. Occurrence of the state that remains is easily prevented. Then, since the separated gate portion 106 is prevented from adhering to the resin cutting blade 20 on the holder 10 side, when the next manufacturing intermediate 100 is cut by the cutting device 1B, the previous cutting is performed. The gate portion 106 generated sometimes does not hinder the cutting operation of the next manufacturing intermediate 100. Thereby, the smooth process at the time of cutting the some manufacturing intermediate body 100 continuously in order is realizable.

  Further, according to the cutting device 1B, the biasing mechanism 12A for preventing the gate portion 106 separated from the manufacturing intermediate 100 from adhering to the resin cutting blade 20a on the holder 10 side is provided with the biasing plate 41. This can be easily realized with a simple structure using the urging cylinder mechanism 51.

  As Example 1, a cutting unit having the same configuration as the cutting unit 5 of the first embodiment was prepared. Moreover, as Example 2, a cutting unit having the same configuration as the cutting unit 5A of the second embodiment was prepared. Moreover, the predetermined cutting unit was prepared as a comparative example. The comparative example has a configuration in which four insert cutting blades are mounted on a holder, and these insert cutting blades are arranged at an equal pitch in the circumferential direction of the holder.

  Using each of the above Example 1, Example 2, and Comparative Example, a production intermediate having the same configuration as that of the production intermediate 100 was cut to produce a molded product. At this time, for each of Example 1, Example 2, and Comparative Example, the number of cuts in the production intermediate until the cutting blade was damaged was examined.

The results are shown in Table 1.

  Thus, the number of cuts of the production intermediate until the cutting blade breaks was only 200 in the comparative example, whereas 2200 in Example 1, reaching Example 2, It became 3000 pieces. That is, Example 1 was 11 times as durable as the Comparative Example, and Example 2 was 15 times as durable as the Comparative Example. From the above, it was proved that the life until the cutting blade was damaged was very high in Example 1 and Example 2.

  INDUSTRIAL APPLICABILITY The present invention can be widely applied as a cutting device for removing unnecessary portions such as a gate portion from an intermediate for producing an injection molded product by cutting.

1, 1A, 1B Cutting device 10 Holder 20a Resin cutting blade 21a First resin cutting blade (resin cutting blade)
22a Cutting blade for second resin (cutting blade for resin)
30a Insert cutting blade 100 Manufacturing intermediate 101 Molded product 103 Insert 103f Adjacent part (second predetermined part)
104 resin part 105 intermediate body (part other than the first predetermined part in the production intermediate)
106 Gate portion (first predetermined portion)
200 Gate C1 Circumferential direction P20, P21, P22 Protrusion amount of resin cutting blade P30 Protrusion amount R1 of insert cutting blade Radial direction r20, r21, r22 Curvature radius of cutting edge of resin cutting blade r30 Cutting edge of cutting blade for insert Radius of curvature S1 axis of rotation

Claims (14)

The first predetermined portion made of resin in the manufacturing intermediate formed by injection molding of the molten resin from the gate toward the cavity in which the insert is disposed from the portion other than the first predetermined portion in the manufacturing intermediate. A cutting device for producing a molded product by removing,
A holder,
A resin cutting blade for turning at least a part of the first predetermined portion while being held by the holder and rotating around a predetermined rotation axis;
An insert cutting blade for turning the second predetermined portion of the insert adjacent to the first predetermined portion while being held by the holder and rotating around the rotation axis;
A cutting device comprising: The cutting device according to claim 1,
The cutting device according to claim 1, wherein the strength of the cutting blade for insert is set higher than the strength of the cutting blade for resin. The cutting device according to claim 1 or 2,
The amount of protrusion of the insert cutting blade from the holder toward the manufacturing intermediate is set to be larger than the amount of protrusion of the resin cutting blade from the holder toward the manufacturing intermediate. A cutting device. The cutting device according to any one of claims 1 to 3,
The cutting device, wherein the width of the cutting edge of the cutting blade for insert is set smaller than the width of the cutting edge of the cutting blade for resin with respect to the radial direction of the rotation axis. The cutting device according to any one of claims 1 to 4,
The cutting radius of the cutting edge of the cutting blade for insert when set along the circumferential direction of the rotation axis is set to be smaller than the curvature radius of the cutting edge of the cutting blade for resin. apparatus. The cutting device according to any one of claims 1 to 5,
A cutting device, wherein a plurality of the cutting blades for resin and the cutting blades for insert are provided, and are alternately arranged around the rotation axis. The cutting device according to any one of claims 1 to 6,
The cutting device has a configuration in which a portion other than the first predetermined portion in the resin portion of the manufacturing intermediate and the first portion are arranged so as to be aligned along a radial direction of the rotation axis. The body is configured to be able to cut a boundary portion between the first predetermined portion and a portion other than the first predetermined portion,
The resin cutting blade includes a first resin cutting blade and a second resin cutting blade,
The first resin cutting blade is formed as a single blade that faces a portion of the resin portion other than the first predetermined portion,
2. The cutting apparatus according to claim 1, wherein the second resin cutting blade is formed as a single blade facing the first predetermined portion. The cutting device according to claim 7,
The cutting device, wherein a width of a cutting edge of the first resin cutting blade is set smaller than a width of the cutting edge of the second resin cutting blade with respect to a radial direction of the rotation axis. The cutting device according to claim 7 or 8,
With respect to the radial direction of the rotation axis, the position of the cutting edge of the second resin cutting blade is set on the first predetermined portion side with respect to the position of the cutting edge of the first resin cutting blade. Cutting device. The cutting device according to any one of claims 7 to 9,
The curvature radius of the cutting edge of the first resin cutting blade when viewed along the circumferential direction of the rotation axis is set to be smaller than the curvature radius of the cutting edge of the second resin cutting blade. And a cutting device. The cutting device according to any one of claims 7 to 10,
The protruding amount of the first resin cutting blade from the holder toward the manufacturing intermediate is set larger than the protruding amount of the second resin cutting blade from the holder toward the manufacturing intermediate. The cutting device characterized by being made. It is a cutting device given in any 1 paragraph of Claims 1 thru / or 11,
Cutting further comprising an urging mechanism capable of urging the first predetermined portion toward the side opposite to the holder side when the resin cutting blade turns the first predetermined portion. apparatus. The cutting device according to claim 12,
The biasing mechanism is
An urging plate capable of contacting the first predetermined portion when the cutting blade for resin has turned the first predetermined portion;
The biasing plate that holds the biasing plate with respect to the holder and that can bias the biasing plate toward the side opposite to the holder side when the cutting blade for resin turns the first predetermined portion. Spring,
The cutting device characterized by including. The cutting device according to claim 12,
The biasing mechanism is
An urging plate capable of contacting the first predetermined portion when the cutting blade for resin has turned the first predetermined portion;
An urging cylinder mechanism capable of urging the urging plate toward the side opposite to the holder side when the cutting blade for resin has turned the first predetermined portion;
The cutting device characterized by including.

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