JPH11277533A - Method and apparatus for heating plastic working of synthetic resin member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method in which separation after heat calking is easy, a processed surface is smooth, the wiping of the surface with an organic solvent and the application of a release agent are not required, and heat calking over a long period is possible and an apparatus for the method. SOLUTION: In an apparatus 1 for heat-calking a lens frame equipped with a tip part 2a for calking in which a abrasion resistant membrane having good releasing and lubricating properties is formed on the surface, an insulator 3 for heating and electrodes 4, 5, and a vertically driving mechanism which can move the tip part 2a toward a synthetic resin lens frame 7, the tip part 2a is moved toward the lens frame 7 for pressing, and a lens frame fringe 7a is deformed plastically by heat-calking.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for heat plastic working of a synthetic resin member, and more particularly to a method of heat plastic working of a synthetic resin member. The present invention relates to an apparatus and a method for hot plastic working of a synthetic resin member having a lubricating and abrasion resistant film formed thereon.

[0002]

2. Description of the Related Art Conventionally, when a lens (not shown) is mounted on a cylindrical lens frame (not shown) made of synthetic resin, the lens is mounted inside an edge (not shown) of the lens frame. Then, a heated metal caulking jig (not shown) is heated and pressed against the edge of the lens frame, and the edge of the lens frame is plastically deformed toward the lens side to perform “heating caulking”. The lens is fixed to the lens frame by the edge of the deformed lens frame.

[0003]

However, in the conventional method as described above, even if the heating crimping process is completed and the crimping jig is to be separated from the lens frame edge,
The edge of the lens frame adheres to the heated crimping jig, making it difficult to separate, and the surface of the edge of the lens frame after the crimping jig separates becomes a rough surface with irregularities. Since the thickness of the edge face is not uniform and the strength for fixing the lens is insufficient, a strength defect occurs, so a release agent for improving the releasability was applied to the surface of the crimping jig. .

However, in order to apply a release agent to the surface of the crimping jig, it is necessary to first wipe the surface with an organic solvent to remove dirt, oil, and the like. On the other hand, the layer of the release agent applied to the surface of the crimping jig becomes thinner when the heating crimping process of the edge of the lens frame is performed several times, so that the heating crimping process of the edge of the lens frame is performed a predetermined number of times. In such a case, it is necessary to again wipe the surface with the organic solvent and apply a release agent, and the number of steps in the processing is large and complicated, and improvement has been demanded.

[0005] In addition, since the crimping jig wears out during the long-term heating and crimping and causes poor appearance and poor strength, preparation of a spare crimping jig and periodic replacement are required. For example, many maintenance steps were required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to solve the above problems by easily separating after heating and caulking, having a smooth work surface, and using an organic solvent. It is an object of the present invention to provide an apparatus and a method capable of performing heat caulking for a long period without necessity of wiping the surface and applying a release agent.

[0007]

Means for Solving the Problems To solve the above-mentioned problems, a heat plastic working apparatus for a synthetic resin member according to the present invention comprises a release / lubrication / abrasion resistant film having good releasability and lubricity on its surface. Forming means, a heating means for heating the processing means, and a driving means for moving and pressing the processing means toward a portion to be processed of the synthetic resin member facing the surface of the processing means. Features.

[0008] In the above-mentioned apparatus for heat plastic working of a synthetic resin member, the release, lubrication and wear-resistant coating is preferably formed by dispersing fluororesin fine particles in an electroless plating film. .

Further, in the above-described apparatus for heating and plastically processing a synthetic resin member, the heating means is preferably a contact electric heating means which is arranged so as to be in contact with the processing means and heats by energization.

Further, in the above-mentioned apparatus for heating and plastically processing a synthetic resin member, the heating means is preferably a buried electric heating means which is buried in the inside of the processing means and generates heat by energization.

[0011] Further, the method for plastically heating a synthetic resin member according to the present invention is characterized in that the surface of the mold has good releasability and lubricity.
A heating means for heating the processing means, a heating means for heating the processing means, and a driving means capable of moving the processing means toward an object; The processing means is moved and pressed toward a portion to be processed of the synthetic resin member facing the surface of the member, and the portion to be processed of the synthetic resin member is plastically deformed.

[0012] In the above-described method of heat plastic working of a synthetic resin member, preferably, the release, lubrication, and abrasion resistant film is formed by dispersing fluororesin fine particles in an electroless plating film. .

In the above-mentioned method of plastically processing a synthetic resin member, preferably, the synthetic resin member is a lens frame, and the processed portion is an edge of the lens frame. A lens is placed inside the edge of the lens frame, and the edge of the lens frame is plastically deformed toward the lens by pressing of the processing means, thereby fixing the lens to the lens frame.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a view showing a configuration of a lens frame heating caulking apparatus according to an embodiment of the present invention. FIG. 2 is a diagram showing a procedure of a method of caulking a lens frame using the heater chip shown in FIG.

As shown in FIG. 1A, the lens frame heating and caulking apparatus 1 includes a heater chip 2, an insulator 3, and electrodes 4 and 5.

The heater chip 2 is formed in a tubular shape, the lower part in FIG. 1A is opened, and the lower end in FIG. 1A (hereinafter, referred to as a "tip for crimping") 2a.
Are formed in a tapered shape whose diameter increases as going toward the outside.

Further, as shown in FIG. 1B, the surface of the inner wall (pressing surface) of the caulking tip 2a has a release / lubrication / abrasion resistant film 16 having good releasability and lubricity. Are formed.

An insulator 3 is attached to the heater chip 2. Although not shown, an electric heating member such as a nichrome wire is built in the insulator 3. Insulator 3 has electrodes 4
5 are attached, and these electrodes 4 and 5 are electrically connected to both ends of an internal electric heating member (not shown).

Therefore, when a current is applied to the electrodes 4 and 5,
The temperature of the insulator 3 is increased by the electric heating member in the insulator 3, and the heater chip 2 in contact with the insulator 3 is heated.

Although not shown, the insulator 3 is provided with a temperature detecting means and a temperature maintaining means.
The temperature of the insulator 3 is kept constant to prevent overheating. As the temperature detecting means and the temperature maintaining means, a thermostat mechanism having a bimetal member or the like, a computer for adjusting the amount of electricity to the electrodes by a signal from a temperature sensor, or the like is used.

Although not shown, the insulator 3 is attached to a lifting drive mechanism. The lifting drive mechanism uses a pneumatic cylinder, a hydraulic cylinder, an electric motor, or the like as a drive source, and connects the insulator 3 to the drive shown in FIG.
It is configured so that it can be moved in the vertical direction of (A). With such a configuration, the lifting drive mechanism (not shown) can drive the heater chip 2 in the vertical direction in FIG.

Next, as shown in FIG. 1 (A), using the above-described lens frame heating and caulking device 1, a lens 6 is formed inside an edge 7a of a lens frame 7 made of synthetic resin and formed in a cylindrical shape.
Is placed, and the lens frame edge 7a is held by the crimping tip 2a.
A method of heating and caulking the lens 6 and attaching the lens 6 to the lens frame 7 will be described.

FIG. 2 is an enlarged view near the edge of the lens frame showing the procedure of the method of caulking the lens frame using the heater chip shown in FIG.

First, the lens frame edge 7a is arranged so as to face the surface (pressing surface) of the inner wall of the caulking tip 2a (FIG. 2A). At this time, the electrodes 4 and 5 are energized, and the insulator 3 is heated by the electric heating member in the insulator 3, whereby the heater chip 2 in contact with the insulator 3 is heated to a predetermined temperature (for example, about 210 to 24).
(About 0 ° C).

Next, an elevation drive mechanism (not shown) is operated to drive the heater chip 2 and move it toward the lens frame edge 7a (FIG. 2B).

Next, the raising / lowering drive mechanism (not shown) is further operated to drive the heater chip 2 maintained at a predetermined temperature to press the crimping tip 2a against the lens frame edge 7a (FIG. 2 (C)). )). The pressing force at this time is, for example, 5 k
g / cm ² .

The temperature of the caulking tip 2a (for example, about 2
The temperature range is about 10 to 240 ° C.), which is the plastic temperature range (the plastically deformable temperature range) of the synthetic resin constituting the lens frame edge 7a.
2C, the lens frame edge 7a is plastically deformed so as to be crushed, and as shown in FIG.
(Inward in the figure).

After the above-mentioned heat caulking, the lifting drive mechanism (not shown) is operated in the opposite direction to the above,
The heater chip 2 is driven in a direction opposite to the above, and the crimping tip 2a is separated from the deformed lens frame edge 7b (FIG. 2D).

In this case, since the release / lubrication / abrasion-resistant film 16 having good releasability and lubricity is formed on the surface of the caulking tip 2a, it can be easily separated, and after the separation, The surface of the edge of the lens frame is also smooth and the wall thickness is uniform, so that the heat caulking is performed reliably.

The release, lubrication and abrasion resistant film 16 reduces the abrasion of the crimping tip 2a, and enables stable heat crimping for a long period of time.

As described above, the outer periphery of the lens 6 is fixed to the lens frame 7 by the bent portion of the deformed lens frame edge 7b.

Next, the release / lubrication / abrasion resistant film 16 formed on the surface of the caulking tip 2a of the heater chip 2 will be described. The release / lubrication / abrasion resistant film 16 is configured by dispersing polytetrafluoroethylene fine particles in an electroless nickel plating film.

The electroless nickel plating film is formed by an “electroless plating method” using nickel as a plating metal.
The electroless plating method is a method of depositing a plating metal on a surface to be plated without using an external power source as in a normal plating method. In order to continuously deposit the plating metal on the surface to be plated, in the electroless plating method, electrons e ⁻ are supplied by an electrochemical mechanism instead of an external power supply.

In the electroless plating method, ions M ^{n +} (n: an integer of 1 or more) of the plating metal M are contained in the electroless plating solution.
The following electrochemical reaction M ^{n +} + ne ⁻ = M occurs due to electrons e ⁻ supplied from a reducing agent or the like described below, and the plating metal M is deposited on the surface to be plated to form a film.

As the electroless plating method, there is an "autocatalytic plating method" in which electrons are supplied by an electrochemical mechanism.

The "autocatalytic plating method" uses an electroless plating solution containing plating metal ions and a reducing agent. In this method, plating metal ions in the electroless plating solution are reduced and precipitated on the catalytically active surface by electrons supplied from a reducing agent. As the reducing agent, a phosphinate or a borohydride compound is used.

Release / Lubrication / Abrasion Resistant Film 1 of the Present Embodiment
6 is poly 4 in the above-mentioned electroless nickel plating film.
Fluorinated ethylene fine particles are dispersed. in this way,
A method for dispersing polytetrafluoroethylene fine particles in the electroless nickel plating film will be described.

FIG. 3A is a conceptual diagram showing the principle of forming a release, lubrication and abrasion resistant film 16 applied to the crimping tip 2a of the heater chip 2 shown in FIG.

As shown in FIG. 3A, the electroless plating solution 10 contains nickel (Ni) ions (Ni ²⁺ ) 11 as plating metal and positively charged polytetrafluoroethylene fine particles. 12 are included. In addition, electroless plating solution 1
Although not shown, the above-mentioned reducing agent is contained in 0. Although not shown, a complexing agent, a buffering agent, a stabilizer, and the like are added to the electroless plating solution 10 so as to deposit a uniform film on the object to be plated.

Therefore, when the crimping tip 2a of the heater chip 2 whose surface is exposed by removing rust or oil on the surface is immersed in the electroless plating solution 10, a reducing agent (not shown) The following electrochemical reaction Ni ²⁺ + 2e ⁻ = Ni occurs on the surface of the caulking tip 2a due to the electrons e ⁻ supplied from.

In this case, if a phosphinate is used as the reducing agent, phosphinate ions containing phosphorus (P) are present in the electroless plating solution 10, so that the surface of the caulking tip 2a is phosphorous together with nickel. Is also precipitated at the same time to form a nickel-phosphorus alloy.

[0043] In the same manner, in the surface of the caulking tip 2a, to polytetrafluoroethylene fine particles 12 positively charged, electrons (e ^-) is supplied. The electrons positively neutralize the positive charges of the polytetrafluoroethylene fine particles 12, and the surface of the caulking tip 2 a is coated with nickel (or nickel-phosphorus alloy) together with poly 4.
The fluorinated ethylene fine particles 14 precipitate together (eutectoid).

FIG. 3B shows a release / lubrication / abrasion resistant film 16 formed on the surface of the caulking tip 2a shown in FIG.
FIG. 3 is a conceptual diagram showing the configuration of FIG.

As shown in FIG. 3B, the surface of the crimping tip 2a immersed in the electroless plating solution 10 has polytetrafluoroethylene fine particles in an electroless nickel plating film 15. A release / lubrication / abrasion resistant film 16 in which eutectoid 14 is formed is formed.

In the release / lubrication / abrasion resistant film 16, the polytetrafluoroethylene fine particles 14 are substantially uniformly dispersed. The diameter of the polytetrafluoroethylene fine particles 14 is 1 μm or less.

Polytetrafluoroethylene has very low tackiness, and therefore has good releasability. In addition, it has self-lubricating properties and has a very small coefficient of friction. Further, the coating of the release / lubrication / abrasion resistant coating 16 to be formed has a predetermined thickness and a uniform thickness. For this reason, the release / lubrication / abrasion-resistant coating 16 greatly improves the releasability and lubricity of the surface of the caulking tip 2a, and, as in the conventional case, the caulking tip using an organic solvent or the like. The wiping and the reapplication of the release agent are not required. Further, since the abrasion resistance is high, the release / lubrication / abrasion resistant film 16 hardly wears even if the heat caulking is performed many times.

In the above-described embodiment, the lens frame heating caulking device 1 corresponds to a heating plastic working device for a synthetic resin member, and the heating caulking process corresponds to heating plastic working.
The crimping tip 2a of the heater chip 2 corresponds to a processing means. The insulator 3 and the electrodes 4 and 5 constitute a heating unit. The elevation drive mechanism (not shown) corresponds to a drive unit. The lens frame 7 corresponds to a member made of synthetic resin, and the lens frame edge 7a corresponds to a portion to be processed. Also, insulator 3
Corresponds to the contact electric heating means. Further, the electroless nickel plating film 15 corresponds to an electroless plating film. The polytetrafluoroethylene fine particles 14 correspond to fluororesin fine particles.

The present invention is not limited to the above embodiment. The above embodiment is an exemplification, and has substantially the same configuration as the technical idea described in the scope of the claims of the present invention. It is included in the technical scope of the invention.

For example, in the above-described embodiment, the lens frame 7 formed in a cylindrical shape has been described as an example of the synthetic resin member. However, the present invention is not limited to this. It may be a resin member.

In the above-described embodiment, the processing means has a tapered tip portion formed in a cylindrical shape, one end of which is open, and the inner wall of one end of which is tapered so as to increase in diameter toward the outside. 2a has been described as an example, but the present invention is not limited to this, and any processing means having a shape or structure suitable for a processed portion of a synthetic resin member to be subjected to heat plastic working can be used. There may be.

Further, in the above-described embodiment, as the heating means, a contact electric heating means which incorporates an electric heating member and heats by contacting the heater chip 2 which is a processing means has been described as an example. However, the present invention is not limited to this, and other heating means, for example, an embedded electric heating means which is embedded inside the processing means itself and generates heat by energization may be used.

In the above embodiment, the electroless nickel plating film 15 has been described as an example of the electroless plating film. However, the present invention is not limited to this, and other metals may be used as plating metals. An electroless plating film may be used.

Further, in the above embodiment, the polytetrafluoroethylene fine particles 14 have been described as an example of the fluororesin fine particles, but the present invention is not limited to this. Is also good.

[0055]

As described above, according to the present invention,
A processing means having a release / lubrication / abrasion resistant film having good release properties and lubricity on the surface, a heating means for heating the processing means, and a driving means capable of moving the processing means toward an object. Since the processing means is moved and pressed toward the processing part of the synthetic resin member facing the surface of the processing means using the heating plastic processing apparatus provided, the processing part of the synthetic resin member is plastically deformed. , The part to be processed after heating plastic working is easy to separate, the processed surface is smooth, there is no need to wipe the surface with an organic solvent or apply a release agent, and the release, lubrication and wear resistance The coating has the advantage that it is hard to wear.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a lens frame heating caulking processing apparatus according to an embodiment of the present invention.

FIG. 2 is an enlarged view near a lens frame edge showing a procedure of a lens frame crimping method using the heater chip shown in FIG. 1;

FIG. 3 is a conceptual diagram showing the principle of forming a release, lubrication, and abrasion-resistant film applied to the crimping tip of the heater chip shown in FIG. 1, and a configuration of the formed release, lubrication, and abrasion-resistant film. is there.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lens frame heating caulking device 2 Heater chip 2a Caulking tip 3 Insulator 4,5 Electrode 6 Lens 7 Lens frame 7a Lens frame edge before caulking 7b Lens frame edge after caulking 10 Electroless plating solution 11 Nickel ion 12 Charged polytetrafluoroethylene fine particles 13 Nickel 14 Polytetrafluoroethylene fine particles 15 Electroless nickel plating film 16 Release, lubrication and wear-resistant film

Claims (7)

[Claims] 1. A processing means having a release / lubrication / abrasion-resistant film having good release and lubricity on a surface, a heating means for heating the processing means, and a surface facing the processing means. A heating and plastic working apparatus for a synthetic resin member, comprising a driving means for moving and pressing the processing means toward a portion to be processed of the synthetic resin member. 2. The heat plastic working apparatus for a synthetic resin member according to claim 1, wherein the release, lubrication, and abrasion resistant film is formed by dispersing fine particles of a fluororesin in an electroless plating film. An apparatus for heating and plastically processing a synthetic resin member. 3. The heating plastic working apparatus for a synthetic resin member according to claim 1, wherein said heating means is a contact electric heating means arranged to be in contact with said working means and heating by energization. Characteristic heating plastic processing equipment for synthetic resin members. 4. The apparatus according to claim 1, wherein said heating means is a buried electric heating means which is buried inside said processing means and generates heat when energized. Thermoplastic processing equipment for synthetic resin members. 5. A processing means having a release / lubricity / abrasion-resistant film having good release and lubricity on its surface, a heating means for heating said processing means, and said processing means as an object. Using a heating plastic working device having a driving means movable toward the head, moving and pressing the processing means toward a portion to be processed of the synthetic resin member facing the surface of the processing means, A heating plastic working method for a synthetic resin member, wherein a part to be processed is plastically deformed. 6. The heat plastic working method for a synthetic resin member according to claim 5, wherein the release, lubrication and wear-resistant coating is formed by dispersing fine particles of a fluororesin in an electroless plating film. A method for hot plastic working of a synthetic resin member. 7. The heating plastic working method for a synthetic resin member according to claim 5, wherein the synthetic resin member is a lens frame, and the processed portion is an edge of the lens frame. A lens is placed inside the edge of the lens, and the edge of the lens frame is plastically deformed toward the lens by pressing of the processing means, thereby fixing the lens to the lens frame. Heat plastic working method for resin members.