KR20130010254A - Surface treatment method for plastic injection mold - Google Patents

Surface treatment method for plastic injection mold Download PDF

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Publication number
KR20130010254A
KR20130010254A KR1020110070929A KR20110070929A KR20130010254A KR 20130010254 A KR20130010254 A KR 20130010254A KR 1020110070929 A KR1020110070929 A KR 1020110070929A KR 20110070929 A KR20110070929 A KR 20110070929A KR 20130010254 A KR20130010254 A KR 20130010254A
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KR
South Korea
Prior art keywords
heat treatment
injection mold
plastic injection
treatment
laser heat
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KR1020110070929A
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Korean (ko)
Inventor
이형일
오근표
김태경
Original Assignee
(주)피앤테크
이형일
오근표
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Priority to KR1020110070929A priority Critical patent/KR20130010254A/en
Publication of KR20130010254A publication Critical patent/KR20130010254A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/06—Surface hardening
    • C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/76—Adjusting the composition of the atmosphere
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/24—Nitriding
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

PURPOSE: A surface treatment method for injection molding of large plastics is provided to process plastic components with combined heat-treating of using laser and ionitriding, thereby solving the existing problems, for example, a environmental problem, crack incidence, transformation, low wear resistance, and increasing efficiency of the process. CONSTITUTION: A surface treatment method for injection molding of large plastics comprises a step of laser heat-treating which treats surfaces of large plastic injection mold, and a step of plasma ionitriding which the surfaces of large plastic injection mold is put into a nitrate brazier for plasma ionitriding. The laser heat-treating is performed in a temperature range between 950 deg. C and 1100 deg. C, and in heat treatment speed range between 2 and 6mm/sec. The Ionitriding of plasma inonitriding step is performed for 20 hours in a temperature 470 deg. C, pressure 200Pa, voltage 650V, and pulse ratio 0.3. A pre-step before the laser heat-treating step is preformed comprise a data verification step of checking data about the figure of a plastic injection mold, and a laser heat-treating condition setting step of setting a heat-treating route, treatment temperature, speed, width and depth for the laser heat treatment. [Reference numerals] (AA) Step of confirming configuration data; (BB) Step of setting a laser heat treatment condition; (CC) Step of laser heat treatment; (DD) Step of post-processing in laser heat treatment; (EE) Step of cleaning a surface; (FF) Step of glow discharge; (GG) Step of plasma ion-nitriding; (HH) Step of modifying surface profile

Description

Composite Surface Treatment of Large Plastic Injection Molds {SURFACE TREATMENT METHOD FOR PLASTIC INJECTION MOLD}

The present invention relates to a composite surface treatment method of a large plastic injection mold, and more particularly, to form a homogeneous martensite layer by heat-treating the surface of a large plastic injection mold using a laser, and to the wear resistance and The present invention relates to a composite surface treatment method of a large plastic injection mold for maximizing fatigue resistance.

In general, methods for adjusting the composition of the mold or performing heat treatment such as high temperature heating are used as a method for strengthening the strength of the injection mold.

Looking at these methods, the direct heating method is a method of heating using a high frequency or a heat source, and the direct heating method using a high frequency requires a large high frequency band depending on the material, which requires a large amount of equipment. Since the direct heating method using a heat source is a technique using a magnetic induction phenomenon of a solid, it is required to manufacture a special coil according to the shape of the part, and there is a problem that the coil production itself has a great influence on the final heat treatment properties as a know-how.

In the case of heat treatment using the past CO2 laser or Nd-YAG laser as a heat source, it can be used for very local and precise parts, but its application was practically impossible due to the deformation caused by heat treatment on large products such as large injection molds.

In particular, since high wear resistance is required on the surface of the injection mold due to the low flowability of the glass fiber added in the plastic material, the surface treatment of the large injection mold has become essential.

On the other hand, a method of nitriding or coating after making a mold at a high temperature in a furnace by indirect heating has been discussed, but there is a problem in that the size of the furnace needs to be large. As a result, it was difficult to apply to the surface treatment of large injection molds.

Therefore, there is an urgent need for the development of a new heat treatment method that can solve the problems of the direct or indirect heating method as described above.

In order to solve the problems described above, the present invention forms a homogeneous martensite layer on the surface of the injection mold through laser heat treatment, and then secures a high hardness surface through ion nitridation treatment to wear resistance and It is an object of the present invention to provide a complex surface treatment method of a large plastic injection mold that can treat a surface of a large plastic injection mold by improving fatigue resistance.

In addition, the present invention overcomes the disadvantages such as environmental problems, cracks, heat treatment deformation, low wear resistance, etc. which are existing in the conventional heat treatment method and at the same time provides a composite surface treatment method of a large plastic injection mold more efficient than conventional surface treatment method The purpose is to.

In addition, an object of the present invention is to provide a composite surface treatment method of a large plastic injection mold of the optimum process using laser heat treatment and ion nitriding treatment.

As a means for solving the problems as described above, the composite surface treatment method of the large plastic injection mold of the present invention,

A laser heat treatment step of heat-treating the surface of the plastic injection mold with a diode laser heat source, and

Plasma ion nitriding treatment step of putting the surface of the plastic injection mold into the nitriding furnace and plasma ion nitriding treatment,

The laser heat treatment in the laser heat treatment step is characterized in that made in the range of the heat treatment temperature 950 ~ 1100 ℃, heat treatment rate 2 ~ 6mm / sec.

In the plasma ion nitriding step, ion nitriding is performed for 20 hours under conditions of a temperature of 470 ° C., a pressure of 200 Pa, a voltage of 650 V, and a pulse ratio of 0.3.

And before the laser heat treatment step,

Shape data checking step for confirming the data on the shape of the plastic injection mold and

A laser heat treatment condition setting step of setting a heat treatment path, a heat treatment temperature, a heat treatment speed, a heat treatment width, and a depth for the laser heat treatment is further provided.

And between the laser heat treatment step and the plasma ion nitriding step,

A surface cleaning step of removing residual organic substances and impurities present on the surface of the plastic injection mold,

After forming a vacuum inside the nitriding furnace, a glow discharge step of supplying nitrogen and hydrogen to activate the surface of the plastic injection mold through glow discharge in an atmosphere of nitrogen and hydrogen is further provided.

And between the laser heat treatment step and the surface cleaning step,

After the laser heat treatment is further provided a laser heat treatment post-treatment step to remove the oxide film generated on the surface of the plastic injection mold and to control the surface roughness.

In the glow discharge step, the ratio of nitrogen and hydrogen is 8: 2, the pressure in the nitriding furnace is 70 Pa, and the temperature is configured to glow discharge under the conditions of 350 to 500 ° C.

And after the plasma ion nitriding step,

The surface roughness correction step of correcting the surface roughness for processing the roughness of the plastic injection mold surface to the required size roughness is further provided.

Through the problem solving means as described above, the present invention can improve the wear resistance and fatigue resistance by securing a high hardness surface through laser heat treatment and ion nitriding treatment, it is possible to treat the surface of large plastic injection mold ,

It overcomes the disadvantages of environmental problems, cracking, heat treatment deformation, low wear resistance, etc., which are existing in the existing heat treatment methods, and is more efficient than conventional surface treatment methods.

There is an advantage to provide an optimal complex heat treatment process using laser and ion nitriding.

1 is a flow chart schematically showing a complex surface treatment method of a large plastic injection mold according to the present invention.

A preferred embodiment of the composite surface treatment method of a large plastic injection mold according to the present invention will be described in detail with reference to the drawings.

1 is a flow chart schematically showing a complex surface treatment method of a large plastic injection mold according to the present invention.

The present invention is a complex surface treatment method of obtaining a large-sized hard plastic injection mold surface through laser heat treatment and ion nitriding treatment can be largely divided into laser heat treatment process and ion nitriding process.

Prior to the description of the laser heat treatment process, the laser heat treatment apparatus includes a diode laser device, a six-axis cantilever robot moving along a rail, an infrared temperature sensor, and a control device. The control device controls the output of the diode laser device according to the temperature measured in real time.

Hereinafter, the laser heat treatment process will be described. First, the shape data checking step (S1) of checking the data on the shape of the plastic injection mold is performed. In this step, the shape, the state of the surface of the plastic injection mold, and the like are treated. The data are entered and the control confirms these data.

After the shape data checking step, the control apparatus includes a laser heat treatment condition setting step S2 for setting a laser heat treatment path, a heat treatment temperature, a heat treatment speed, a heat treatment width and a depth, and the like based on the identified data.

When the heat treatment condition is set, it enters the laser heat treatment step (S3), and in this heat treatment step, the heat treatment temperature of the surface of the plastic injection mold is maintained at 950 to 1100 ° C., and the feeding speed of the laser beam is 2 to 6 mm / sec. Laser heat treatment while maintaining (S3).

Here, as described above, the heat treatment at the heat treatment temperature and the beam feeding speed solves a phenomenon in which the heat treatment is not sufficiently performed when the heat treatment temperature is lowered or the beam feeding speed is lowered. To prevent the phenomenon of melting on the surface of the plastic injection mold that occurs when the high or the beam feed rate is increased.

Since the homogeneous martensite layer can be formed on the surface of the plastic injection mold through the laser heat treatment as described above, the conditions for facilitating the diffusion of nitrogen atoms in the ion nitridation process described later will be formed.

When the laser heat treatment step (S3) is completed, after cooling the plastic injection mold, the laser heat treatment post-treatment step of removing the oxide film generated on the surface of the plastic injection mold due to the laser heat treatment and correcting the surface roughness through the surface treatment ( It goes through S4).

Hereinafter, the ion nitridation process will be described in detail.

Prior to the description of the ion nitriding process, the plasma ion nitriding equipment for plasma ion nitriding treatment will be described. The plasma ion nitriding equipment is composed of a power supply and a control device, a gas supply device and a vacuum control system. The control device converts and supplies power introduced from the outside and controls the plasma ion nitriding process. The gas supply device supplies a gas such as nitrogen and hydrogen used for ion nitriding and controls the flow rate thereof, and the vacuum ( A vacuum device is a device for forming a vacuum in a nitriding furnace for ion nitriding.

Ion nitriding treatment is first subjected to a surface cleaning step (S5) to remove organic matter and impurities present on the surface of the plastic injection mold after laser treatment.

Specifically, it is preferable to perform ultrasonic cleaning in this step with alcohol and acetone.

When the cleaning is completed, charge the plastic injection mold into the nitriding furnace, reduce the pressure in the nitriding furnace to 0.1 torr or less to form a vacuum, and supply nitrogen gas and hydrogen gas to glow discharge in the atmosphere of nitrogen gas and hydrogen gas. The glow discharge step (S6) to go through.

This glow discharge physically cleans the dense oxide film and other impurities formed on the surface of the plastic injection mold prior to the ion nitriding treatment, and decomposes and removes various contaminated organic matters through the highly reducing hydrogen ions into the nitriding furnace. It maintains the atmosphere as reducing and performs the chemical cleaning function to promote the nitriding by inhibiting the surface oxidation of the plastic injection mold.

At this time, the ratio of nitrogen and hydrogen is maintained at 8: 2, and the working pressure is preferably 70 Pa and the working temperature is 350 to 500 ° C. This is the highest hardness value when the ratio of nitrogen and hydrogen is 8: 2. This is because the working pressure tends to increase the cleaning effect through glow discharge up to 70 Pa, but the cleaning effect tends to decrease afterwards (because of the increase in pressure, nitrogen and hydrogen ions are different from other high density neutral and exhaust gases). Due to collisional scattering.

 This is because the working temperature shows similar cleaning effect at 350 ~ 500 ℃, but the effect is decreased at over 500 ℃ or below 350 ℃. Because it decreases}.

After cleaning the surface of the plastic injection mold through the glow discharge, the plasma is subjected to a plasma ion nitriding step (S7) of generating a plasma on the surface of the plastic injection mold to ion nitrate.

In this step, ion-nitriding treatment using pulsed plasma (Pulse plazma) is performed on the plastic injection mold in an atmosphere of nitrogen and hydrogen, and the use of this pulsed plasma ion-nitriding treatment suppresses the generation of complex arcs. This is because unnecessary energy loss due to overheating of the plastic injection mold surface is reduced, and power consumption is reduced.

In this step, the working conditions will be described. First, the ratio of nitrogen gas and hydrogen gas introduced into the nitriding furnace is maintained at 8: 2 because the thickest nitride layer is formed at this ratio.

In fact, the nitriding temperature was 520 ° C for the mold material FCD550, the treatment time was 10 hours, and the pressure was 250 Pa. The ratio of nitrogen gas and hydrogen gas was measured and the thickness of the nitride layer was 3.6 at a ratio of 2: 8. The thickness of the nitride layer is 3.7 µm at the ratio of 5: 5 and the thickness of 5: 5, and the thickness of the nitride layer is 6 µm at the ratio of 8: 2, where the thickest nitride layer is formed at the ratio of nitrogen gas and hydrogen gas at 8: 2. It can be seen that.

In addition, the nitriding treatment temperature is preferably 470 ° C because the thickness of the nitride layer formed at this temperature is relatively thick and the hardness is the highest.

The nitriding discharge discharge pressure is preferably 200 Pa and the voltage is 650 V. The pulse ratio {(pulse holding time) / (pulse holding time + pulse holding time)} is preferably 0.3, and the nitriding treatment time is 20. It is preferable to carry out for a time.

When the plasma ion nitriding treatment is completed, the surface roughness correction step (S8) is finally performed to process the surface roughness of the plastic injection mold into the required size, which is excessive due to the deterioration of the fluidity at the time of injection. Heat is generated, and this heat is to prevent this because it lowers the hardness of the plastic injection mold again.

As described above, a preferred embodiment according to the present invention has been described, and the fact that the present invention can be embodied in other specific forms in addition to the above-described embodiments without departing from the spirit or scope thereof is known to those skilled in the art. It is obvious to those who have it.

Therefore, the above-described embodiments should be regarded as illustrative rather than restrictive, and thus, the present invention is not limited to the above description but may be modified within the scope of the appended claims and their equivalents.

Claims (7)

A laser heat treatment step of heat-treating the surface of the plastic injection mold with a diode laser heat source, and
Plasma ion nitriding treatment step of putting the surface of the plastic injection mold into the nitriding furnace and plasma ion nitriding treatment,
The laser heat treatment in the laser heat treatment step is characterized in that the heat treatment temperature is made in the range of 950 ~ 1100 ℃, heat treatment rate 2 ~ 6mm / sec
Composite Surface Treatment of Large Plastic Injection Mold
The method according to claim 1,
In the plasma ion nitriding step, the ion nitriding treatment is performed for 20 hours under conditions of a temperature of 470 ° C., a pressure of 200 Pa, a voltage of 650 V, and a pulse ratio of 0.3.
Composite Surface Treatment of Large Plastic Injection Mold The method according to claim 2,
Prior to the laser heat treatment step,
Shape data checking step for confirming the data on the shape of the plastic injection mold and
A laser heat treatment condition setting step of setting a heat treatment path, a heat treatment temperature, a heat treatment speed, a heat treatment width, and a depth for the laser heat treatment is further provided.
Composite Surface Treatment of Large Plastic Injection Mold
The method according to claim 2,
Between the laser heat treatment step and the plasma ion nitriding step,
A surface cleaning step of removing residual organic substances and impurities present on the surface of the plastic injection mold,
After forming a vacuum inside the nitriding furnace, the glow discharge step of activating the surface of the plastic injection mold through the glow discharge in the atmosphere of nitrogen and hydrogen by supplying nitrogen and hydrogen further characterized in that it is further provided
Composite Surface Treatment of Large Plastic Injection Mold
The method of claim 4,
Between the laser heat treatment step and the surface cleaning step,
After the laser heat treatment is further characterized in that the laser heat treatment post-treatment step to remove the oxide film generated on the surface of the plastic injection mold and to control the surface roughness
Composite Surface Treatment of Large Plastic Injection Mold
The method of claim 4,
In the glow discharge step, the ratio of nitrogen and hydrogen is 8: 2, the pressure in the nitriding furnace is 70 Pa, and the temperature is glow discharged under the conditions of 350 to 500 ° C.
Composite Surface Treatment of Large Plastic Injection Mold
The method according to claim 2,
After the plasma ion nitriding step,
Surface roughness correction step of modifying the surface roughness by processing the roughness of the plastic injection mold surface to the required size, characterized in that it is further provided
Composite Surface Treatment of Large Plastic Injection Mold
KR1020110070929A 2011-07-18 2011-07-18 Surface treatment method for plastic injection mold KR20130010254A (en)

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KR1020110070929A KR20130010254A (en) 2011-07-18 2011-07-18 Surface treatment method for plastic injection mold

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3190148A4 (en) * 2014-09-05 2018-01-24 Osaka University Method for manufacturing surface-modified molded article, and method for manufacturing composite using surface-modified molded article

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3190148A4 (en) * 2014-09-05 2018-01-24 Osaka University Method for manufacturing surface-modified molded article, and method for manufacturing composite using surface-modified molded article

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