JPH071464A - Manufacture of mold for molding plastic net material - Google Patents

Abstract

PURPOSE:To form grooves to a mold in a lattice form and to remove burr along the grooves by a slide plate by cutting the mold by an edge tool coinciding with a groove shape and formed into a mirror surface while applying fine reciprocating vibration to the edge tool and injecting cutting oil to the cutting surface of the edge tool so as to scatter cut refuse forwardly from the rear surface of the edge tool. CONSTITUTION:The edge tool cutting a mold to form grooves to the mold coincides with a groove shape and is formed into a mirror surface and grooves are formed to the mold in a lattice form while fine ultrasonic reciprocating vibration is applied to the edge tool attached to a cutter. At this time, cutting oil is injected to the cutting surface of the edge tool in order to scatter cut refuse forwardly from the rear surface in the advance direction thereof to prevent the breakage of the edge due to the cut refuse. After the grooves are formed in a lattice form, a slide plate 1 is slid along the grooves and a burr and parting line angle surface is polished at an acute angle and the flow of the resin in the grooves is kept. Therefore, latticelike meshes are ensured and no burr is generated between meshes and quality is enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to oil or air filters for automobiles and electronic devices, nets for fry farming, daily sundries and their filters, and parts for various devices, accessory nets and covers. -Regarding a method for manufacturing a mold used for manufacturing a plastic net body used for etc., more specifically, when forming a groove in the mold, there is no breakage of a blade, and a corner portion is The present invention relates to a manufacturing method having an acute angle and free from burrs.

[0002]

2. Description of the Related Art The applicant of the present invention relates to the above-mentioned plastic net body, and (a) a band body which communicates with the net thread and (b) stores a molten resin pressed from a gate and has a diameter larger than at least the net thread. And (c) the strip has a closed shape capable of accumulating and does not communicate with the frame, and (d) an induction zone that forms a permeation region for allowing the molten resin to permeate the mesh thread communicated with the accumulating pressure is formed in the frame. It has been previously proposed to integrally mold a mesh made of plastic to form a mesh (Japanese Patent Application No. 4-308205).

However, the following problems remain in the production of this plastic net body. (A) Oil or air filter for automobiles and electronic devices
As described above, it is difficult to flow the resin into the resin having a very fine mesh, and the resin injected from the gate does not reach the end without removing the resin. , It is necessary to finish the groove of the mold sufficiently to a mirror surface. However, since the shape of the groove is made finer in accordance with the groove that is very fine, the blade is easily broken, and it takes a great deal of nerve to manufacture the mold and is expensive. (B) If a conventional cutter blade that is not mirror-finished is used, the surface is crushed to leave pressure line marks, and as a result, when the molded product is released from the mold, the molded product is eroded on the uneven surface. It has become a cause for the molded product not to come off from the mold. (C) Furthermore, when the warp threads and the weft threads are made to intersect on the same plane without providing the upper and lower steps in the net body, the mold will have vertical and horizontal grooves on the core side, but the corners will be sharp. There is a drawback that it is difficult to cut out, there is a high possibility that burrs will be generated at the time of molding, and that blisters called mold burrs are generated, which hinders the formation of a mirror surface.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and (a) promotes the formation of a mirror surface by ultrasonic vibration, and at the same time eliminates the loss of the blade and makes stable groove cutting. Therefore, (b) a method of manufacturing a die for polishing a corner portion facing the parting line to an acute angle and forming a mirror surface groove with extremely high precision without burr.

[0005]

The method for producing a plastic net body molding die according to the present invention comprises forming a mesh in a frame,
(A) Form a band having a diameter at least larger than that of the net yarn, which is in communication with the net yarn, and (b) stores the molten resin pressed in from the gate, and (c) does not communicate with the frame. (D) An induction zone forming a permeation zone for permeating the molten resin is arranged in the mesh thread communicating with the accumulated pressure (d), and the permeation zone with the induction zone is overlapped at the end to form a mesh body. The target is a plastic net body that is made by continuously molding. Then, in the die manufacturing of the net body, cutting is performed so as to match the groove shape, and a cutter formed on the mirror surface is attached to the cutter, and an ultrasonic vibrator is connected to the cutter to cause reciprocating microvibration. While cutting while adding, the cutting oil is sprayed on the cutting surface of the cutting tool at a pressure that can scatter cutting chips forward from the back surface in the traveling direction of the cutting tool, and either one or both of the lower mold and the upper mold of the mold. In the process of forming the vertical grooves and the horizontal grooves in a grid pattern, a sliding plate having a strength capable of scraping the burrs along the vertical grooves and the horizontal grooves is slid in parallel with the grooves to remove the burrs and the patterning. And a step of polishing the corner surface of the line to an acute angle.

[0006]

When a blade having an ultrasonic transducer connected to one or both of the lower die and the upper die of the mold is acted, the ultrasonic energy is shocked to release the vibration energy. By repeating the cycle, the cutting surface becomes a geometrical surface roughness, leaving no impression line mark due to surface crushing as in conventional cutting, and facilitates demolding. At that time, when cutting oil is sprayed onto the cutting surface of the cutting tool from the back surface in the traveling direction of the cutting tool, the cutting chips are scattered in the gap between the cutting tool and the cutting surface, and the cutting edge of the cutting tool is broken. There is no accident. Thus, after forming vertical grooves and horizontal grooves in a grid pattern on one or both of the lower mold and the upper mold of the mold, the sliding plate slides along the vertical grooves and horizontal grooves in parallel with the grooves. Then, removal of burrs and polishing of the corner surface of the parting line at an acute angle keeps the resin flowing in the groove and prevents the occurrence of burrs from the parting line.

[0007]

EXAMPLES In the method of manufacturing a mold of the present invention, first, the present inventor first proposed to form a mesh in a frame, (a) communicate with the mesh yarn, and (b) press-fit from the gate. Forming a band having a diameter at least larger than that of the net thread for storing the melted resin, (c) the band is in a closed state capable of accumulating and does not communicate with the frame, and (d) the mesh thread communicating with the accumulated pressure is formed. A plastic net body is provided in which an induction zone is formed to form a permeation zone for permeating the molten resin, and the permeation zone with the induction zone is overlapped at an end to continuously form a net body (Japanese Patent Application No. No. 4-308205), a method of manufacturing a mold for molding the same is targeted.

Any type of plastic mesh can be used, but it is particularly suitable for oil or air-filters for automobiles and electronic devices having an extremely fine mesh, and therefore, here, As shown in FIG. 1C, the shape of the net groove is such that the upper surface of the opening is 0.3 mm, the base is 0.08 mm, the height is 0.6 mm, and the inclination angle θ =
A case of engraving a 10 ° groove on the upper die side of the die will be described. The groove is formed by engraving on the same surface of the mold without making the vertical groove and the horizontal groove in steps, and the groove is formed by either the lower mold or the upper mold, or the lower mold and the upper mold. It may be engraved on both sides.

At this time, a cemented carbide tip can be used as a tool for cutting the net groove of the die, and the cemented carbide tip is
Generally, it is used for cutting the outer shape of the shaft, etc., and if it is used for cutting the fine mesh groove as described above, it is easily chipped, and thus it is unsuitable. Therefore, according to the present invention, first, according to the shape of the net groove, the tip a = 0.09 mm, the opening surface b
= 0.3, height c = 0.6 mm, inclination angle θ = 10 °, the tip of the chip is cut, and its surface is sufficiently mirror-finished using a diamond grindstone or the like. However, the blade is not limited to the cemented carbide tip, and diamond CBM grades and the like can also be used.

Next, using the blade for cutting the net groove,
An ultrasonic oscillator is connected to the blade so as to make a vertical groove or a horizontal groove in the mold, and cutting vibration is applied while pouring cutting oil to the friction surface. The oscillator of the ultrasonic wave is, for example, a Langevin type PZT oscillator with an oscillation frequency of 19 ±
The transmission frequency is set to 1.5 KHz, the transmission method is microcomputer-controlled PLL automatic tracking, and the maximum ultrasonic output is 120 W. Due to the ultrasonic vibration, a shock is applied with a large acceleration at the moment of moving in the traveling direction for cutting, and at the next moment, it is pulled down to store force in the vibrating body to prepare for the next shock, and the vibration energy is shocked. By repeating the discharging cycle, chips are generated and deleted in small increments. At this time, as shown in FIG. 2, when the blade tilts in the cutting direction by −θ and vibrates, the flank face and the mold collide violently, while when tilted by a large amount in + θ and vibrates, the blade tip becomes a mold. It is easy to bite, and to avoid this, −
It is desirable to incline in the range of 2 to 3 on the θ side, and for this inclination, it is desirable to additionally provide a pitching angle correction mechanism.

As a result, the die having a low natural frequency does not undergo dynamic displacement, the spring constant increases, and an effective cutting action is brought about, and the cutting surface has a geometrical surface roughness, which results in conventional cutting. It does not leave a pressure line mark due to surface crushing as in. Since the pressure striations cause unevenness to be formed on the taper surface, they have been a cause of not coming off when the molded product is demolded in the upward direction, but this is eliminated.

When the ultrasonic vibration is applied to the cutting surface, the cutting oil is supplied to the cutting surface to form an oil surface in the gap between the cutting tool and the cutting surface that reciprocates by the vibration, thereby enabling precise cutting as a mirror surface. It is an important factor that
As shown in (A), it was performed from the front surface or the side surface in the traveling direction of the blade. However, as described above, lubrication from this direction produces chips when cutting by ultrasonic vibration, and the produced chips accumulate between the cutting tool and the cutting surface and are processed into a very fine shape. The experiment by the present inventor has revealed that it is a factor that breaks the cutting edge.

Therefore, in the present invention, this cutting oil is used as shown in FIG.
As shown in (B), oil is applied from the back side in the traveling direction of the cutting tool, and the injection pressure is set to a pressure sufficient to scatter the chips accumulated between the cutting surface and the cutting surface of the cutting tool in the forward direction. Then, chips are generated by the ultrasonic vibration, and even if it is sandwiched between the blade and the cutting surface, the chips are jetted forward by the injection of cutting oil from the back surface, and the blade and the cutting surface are separated. Only oil intervenes between them, enabling mirror surface formation while preventing damage to the cutting edge. In addition, at the time when the cutting oil is likely to be heated, such as in the summer, it is necessary to attach an oil coolant and inject a mixture of air and cooling oil from the same direction in order to prevent heating of the finely shaped cutting edge. desirable.

After the cutting is repeated by the above method to form the vertical groove or the horizontal groove, the other horizontal groove or the vertical groove is then formed,
The cutting grooves are formed in a grid pattern. At this time, as shown in FIG. 4, when cutting a subsequent groove, for example, a lateral groove, a burr called a burr occurs inside the previously cut vertical groove, and it is left as it is. It hinders the flow of resin during molding. In such a case, conventional lapping or the like is difficult to apply to a fine groove as in the present invention, and even if a sharp sliding piece is pressed according to the shape of the groove, the tip is rubbed. If it becomes worn out, it cannot be used immediately. Simultaneously with the burr, a gap is formed in the pattern line between the lower mold and the upper mold at the time of molding unless the corners of the open upper surface are acute in forming the mesh groove, and resin burr is generated. Cause.

In order to solve the above problem, the present invention is shown in FIG.
As shown in (A), a sliding plate 1 is formed with a constant physical strength, for example, a steel plate formed into a relatively thin plate so that the burrs can be scraped off by inserting it into a net groove. Slide along the taper surface of the groove. As shown in FIG. 5, for example, a device for sliding the slide plate 1 is gripped by a chucking 2 and a guide rod 3 is provided so as to be slidable according to the taper surface of the net groove. Hand it over and reciprocate it with a reciprocating cylinder. Then, the flat surface of the sliding plate 1 and the taper surface of the net groove are rubbed against each other, and the burrs in the vertical groove are scraped off to make the net groove free from obstacles. The slanted surface of No. 1 sharpens the corner portion so that there is no so-called corner sag.
In addition, when lapping powder such as tire mond powder is interposed therein, it also has the effect of polishing the taper surface to make it a mirror surface.

The vertical grooves and the horizontal grooves thus formed are mirror surfaces with excellent surface precision, and therefore, during molding,
When the molten resin reaches the end of the mesh and there is no trace of pressure when the mold is released, it can be easily released from the lower mold or the upper mold. Further, the number of projecting pins when the molded resin is removed from the mold can be made smaller than usual, and the manufacture of the mold becomes easy.

[0017]

According to the method for manufacturing a mold of the present invention based on the above-mentioned constitution, an induction zone for forming a permeation region for permeating a molten resin at an accumulation pressure is arranged in the periphery, and a net body is continuously molded integrally. The plastic net body is suitable for cutting the net groove of the mold, especially for those having an extremely fine mesh such as oil or air filter for automobiles and electronic devices, and it is possible to apply pressure traces by ultrasonic vibration. It is possible to form a mirror-like surface free from scratches, and the chips produced at that time do not accumulate on the front surface, which does not cause an accident such as chipping of the cutting edge, and stable cutting is possible.

Further, since the sliding plate does not cause burrs or angular sag on the surface of the parting line, the molten resin reaches the end and burrs do not occur between the meshes, and the meshes are formed in a grid pattern. It can be molded into a secured high quality net.

[Brief description of drawings]

FIG. 1 shows an example of a mold used in the manufacturing method of the present invention, (A) is a plan view, (B) is a vertical side view, and (C) is a partially vertical side view in which a part of a groove is enlarged. Is.

FIG. 2 is a schematic side view of a state in which a blade is attached to a holder and vibration is applied.

FIG. 3 is a partially longitudinal side view showing a state of lubrication of a blade,
(A) shows the conventional method and (B) shows the method of the present invention.

FIG. 4 is a schematic plan view showing a state in which burrs are generated on the vertical groove side when a lateral groove is cut by a cutting tool.

FIG. 5 is a side view showing an example of a sliding plate device.

FIG. 6 is a partially longitudinal side view showing a state in which the inside of a groove is polished by a sliding plate, showing (A) a smooth plate and (B) a semicircular tip.

[Explanation of symbols]

 1 sliding plate 2 chucking 3 guide rod

Claims (4)

[Claims] 1. A mesh is formed in a frame, (a) is connected to a mesh yarn, and (b) forms a band having a diameter larger than at least the mesh yarn for storing the molten resin pressed from the gate, (C) The band has a closed shape that does not communicate with the frame and is capable of accumulating pressure, and (d) an induction zone that forms a permeation region for allowing the molten resin to permeate the mesh thread that is in communication with the accumulating pressure is provided. In a plastic net body in which the permeation areas of and are overlapped at the end and the net body is continuous and integrally molded, a cutter that matches the groove shape and is formed on the mirror surface is used as a cutter.
Mounted on the blade, and an ultrasonic vibrator is connected to the blade for cutting while applying reciprocating micro-vibration, and cutting is performed on the cutting surface of the blade with pressure that can scatter cutting chips forward from the back surface in the traveling direction of the blade. A method for producing a plastic net-molding mold, characterized in that oil is sprayed and vertical grooves and horizontal grooves are formed in a lattice pattern on either or both of the lower mold and the upper mold of the mold. 2. A mesh is formed in the frame, and (a) is connected to the mesh thread, and (b) forms a band having a diameter larger than at least the mesh thread for storing the molten resin pressed from the gate, (C) The band has a closed shape that does not communicate with the frame and is capable of accumulating pressure, and (d) an induction zone that forms a permeation region for allowing the molten resin to permeate the mesh thread that is in communication with the accumulating pressure is provided. In a plastic net body in which the permeation areas of and are overlapped at the end and the net body is continuous and integrally molded, a cutter that matches the groove shape and is formed on the mirror surface is used as a cutter.
Mounted on the blade, and an ultrasonic vibrator is connected to the blade for cutting while applying reciprocating micro-vibration, and at the same time, cutting pressure is applied to the cutting surface of the blade from the back surface in the traveling direction of the blade. A process of injecting oil to form vertical grooves and horizontal grooves in a lattice shape in one or both of the lower mold and the upper mold of the mold, and a slide having a strength capable of cutting off burrs along the vertical grooves and the horizontal grooves. Manufacture of a plastic net body molding die characterized by sliding the moving plate in parallel with the groove to remove burrs and polishing the corner surface of the patenting line to an acute angle. Method. 3. The sliding plate is a smooth plate having a depth higher than the depth of the groove, and the sliding plate is slid along one surface of the V-shaped groove and then slid from the other surface by changing the inclination angle. A method for manufacturing a plastic net body molding die according to any one of claims 1 and 2. 4. The plastic according to claim 1, wherein the sliding plate has a thickness that matches the groove width, and the tip of the sliding plate is formed in a semicircular shape that matches the groove width. A method for producing a mold for forming a net body.