WO2001081071A1 - Moulded resin article that has a metallic boss and process for the production thereof - Google Patents

Moulded resin article that has a metallic boss and process for the production thereof Download PDF

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Publication number
WO2001081071A1
WO2001081071A1 PCT/NL2001/000317 NL0100317W WO0181071A1 WO 2001081071 A1 WO2001081071 A1 WO 2001081071A1 NL 0100317 W NL0100317 W NL 0100317W WO 0181071 A1 WO0181071 A1 WO 0181071A1
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WO
WIPO (PCT)
Prior art keywords
metallic boss
moulded resin
resin
boss
metallic
Prior art date
Application number
PCT/NL2001/000317
Other languages
French (fr)
Inventor
Hideki Yamaguchi
Michael Oliveto
Original Assignee
Dsm N.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dsm N.V. filed Critical Dsm N.V.
Priority to AU2001250676A priority Critical patent/AU2001250676A1/en
Publication of WO2001081071A1 publication Critical patent/WO2001081071A1/en

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Classifications

    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/32—Measures for keeping the burr form under control; Avoiding burr formation; Shaping the burr
    • B29C66/322—Providing cavities in the joined article to collect the burr
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/44—Joining a heated non plastics element to a plastics element
    • B29C65/46—Joining a heated non plastics element to a plastics element heated by induction
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/74—Joining plastics material to non-plastics material
    • B29C66/742—Joining plastics material to non-plastics material to metals or their alloys
    • B29C66/7428—Transition metals or their alloys
    • B29C66/74283—Iron or alloys of iron, e.g. steel
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/94—Measuring or controlling the joining process by measuring or controlling the time
    • B29C66/949—Measuring or controlling the joining process by measuring or controlling the time characterised by specific time values or ranges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/32—Wheels, pinions, pulleys, castors or rollers, Rims

Definitions

  • This invention relates to a moulded resin article that has a metallic boss, and a process for the production thereof, and it particularly relates to a process for the production of a moulded resin article with a metallic boss that does not require afterprocessing of the metallic boss, and wherein processing waste, wherein scraps of metal and moulded resin body have been mixed, is not produced.
  • a moulded resin body is heated and melted to the outer circumference of a metallic boss and both are hereby united to one body by hot pressing the moulded resin body to the outer circumference of the said metallic boss, and thereafter cooling, and in which subsequently both are heated and melted together by melting the part of the moulded resin body that touches the outer circumference of the metallic boss by high frequency induction heating, and in which air that has been enclosed in interstices between the outer circumferential surface of the moulded resin body is expelled to outside the moulded resin body by melted resin.
  • a tubular moulded resin body with a long length is united with a metallic boss with a long length by pressing and hot melting it to the outer circumference of the metallic boss, and that a number of intermediary raw materials that contain a metallic boss, are produced by slicing the moulded resin article to discs with a prescribed thickness.
  • This invention has the aim to offer a moulded resin article with a metallic boss and a process for the production thereof wherein the above mentioned problems have been solved.
  • This aim is achieved in a process in which a metallic boss, that in advance has been processed to its final form is used, and in which melted resin that flows out to the outside of the moulded resin body is retained in one or more side surfaces of the metallic boss and solidified by cooling, so that the resin is not protruding from the side surface of the moulded resin article.
  • Preferred is a process in which at least one recess for retention of melted resin is established in the side surface of the metallic boss, melted resin is retained in the said recess, and the retained resin is solidified by cooling , in such way that the resin forms one surface with the side surface of the moulded resin article.
  • Another preferred embodiment of the invention is a process in which the width of the moulded resin body is wider than the width of the metallic boss, and melted resin is solidified by cooling, while being retained in the level differences of both.
  • Resins suitable for the present invention may be selected from high performance polymers with high thermal stability and good mechanical properties, such as polyesters, polyamides, fluoropolymers, polyketones (like PEEK, PEAK, PEKK), polyimides (like PAI), etc.
  • the coefficient of thermal expansion of the resin material should be close to the coefficient of thermal expansion of the metallic boss to preserve the integrity of the joined resin-metal body.
  • the most preferred resins for use in production of worm gears are polyamides (like nylon 6, nylon 12, nylon 4,6) and polyacetals.
  • a moulded polyamide resin body with inside diameter similar to the diameter of the metallic boss is pressed over the metallic boss to produce a nylon coated steel worm gear.
  • Moulded resin articles according to the present invention may be obtained from a wide variety of metals, such as steel, iron, brass, bronze or aluminum. Choice of a suitable metal depends on the desired mechanical characteristics of the end product. For production of worm gears for automotive power steering systems requiring high load, energy and torque capacity, the preferred metal is steel.
  • the metallic boss may be obtained by sintering of powder metal, i.e. by pressing powder metal and then heating the pressed metal.
  • powder metal i.e. by pressing powder metal and then heating the pressed metal.
  • Various metals such as steel, brass, aluminum or bronze may be used in the invention.
  • the powder metal is placed into a die of a desired shape and compacted or pressed to form the unitary metallic boss of the desired configuration.
  • the pressed metal particles are held together by inter- particle friction to form a "green-compact”.
  • the green compact is then placed into a furnace and heated to a temperature which is less than the melting temperature of the metal but which is sufficiently high to soften the metal particles and cause coalescing of the interfaces between the particles to unify the structure into a sintered metal matrix.
  • the resulting structure is inherently porous.
  • the metal body can be formed or sintered into a wide variety of final forms, from simple bars or rods to more complex irregular shapes depending on the end use of the final product.
  • the preferred powder metal is stainless steel powder.
  • a silane coupling agent a primer or epoxy based adhesives
  • the metallic boss is heated, preferably by an induction coil, to a temperature slightly above the melting temperature of the resin causing the resin surrounding the metallic boss to melt.
  • the molten resin flows to and fills the pores, voids, cavities and other irregularities on the surface of the metallic boss.
  • the joined body is then cooled below the melting temperature of the resin, the resin solidifies and bonds adhesively and mechanically to the metallic boss.
  • the bonding forces between moulded resin body and the metallic boss are significantly stronger than the bonding forces in articles based on moulded and knurled metallic bosses.
  • This embodiment of the present invention allows the elimination steps of grit blasting of a knurled metallic boss, cleaning the metal surface, and using a silane coupling agent often necessary to achieve good bonding between the metallic boss and the surrounding moulded resin body.
  • the invention relates also to a metallic boss in its final, end-use, form. From a metal bar metallic bosses can be shaped to their final form.
  • the shaped metallic boss is having at least one recess at its side surface to accommodate for the takeup of melted resin while preparing the moulded resin article.
  • the metallic boss is made by a powder sintering process.
  • the moulded resin article of the present invention is made by hot pressing a moulded resin body to the outer circumference of a metallic boss and joining the parts together using high frequency induction heating.
  • the process for high frequency induction heating as such is known in the art. It generally uses a frequency of 0.5-200 kHz in a period of from 10-200 sec, this being dependant of the melting point of the resin in the moulded resin body.
  • the temperature to which the metallic boss is heated, is slightly above the melting temperature of the resin; in the case nylon-6 is used, said temperature is in the range of 240-260°C.
  • Figure 1 is a cross section of an example of a moulded resin article with a metallic boss that has been obtained with the process of the present invention
  • Figure 2 is a cross section of another example of a moulded resin article with a metallic boss that has been obtained with the process of the present invention.
  • 1 is the metallic boss, and the said boss has been processed in advance tot the final form or to the form of an article that is close to the final form, by forging etc.
  • the moulded resin body with the form of a hollow disc that has been formed from a polymeric resin, preferably a polyamide resin, the inner circumferential surface being moulded to a diameter that is 0.4-3% smaller than the outer diameter of the metallic boss 1.
  • the prescribed thightening power is given by hot pressing of the moulded resin body 2 in the heated state on the outer circumference of the metallic boss 1 , and thereafter cooling.
  • the outer circumference of the metallic boss 1 is heated by high frequency induction heating to a temperature at which the resin of the moulded resin body melts or higher, and the part of moulded resin body 2 that touches this material surface is melted, and both metallic boss 1 and moulded resin body 2 are heated and melted against each other.
  • the melted resin that is produced in this heating and melting process flows out, while expelling air that has been enclosed in the interstices between the outer circumferential surface of the metallic boss 1 and the inner circumferential surface of moulded resin body 2, out of the moulded resin body 2. Then the melted resin 2a that flows out, is retained in recesses
  • the volume of the space of recesses 1 b for retention, that are present in the metallic boss 1 may be established by prior calculation of the quantity of melted resin 2a that flow outs from moulded resin body 2.
  • 1 in the figure is a metallic boss, and the said boss is processed in advance by forging etc., to the final form or to the form of an article that is close to the final form.
  • surface processing such as grid blasting is carried out in the same way as in Figure 1.
  • 2 is a moulded resin body with the form of a hollow disc that has been moulded from a polymeric resin, preferably polyamide resins.
  • the inner circumferential surfaceof moulded resin body is moulded to a diameter that is 0.4- 3% smaller than the outer diameter of the metallic boss 1 , the width W of the moulded resin body 2 being a little wider than the width of the metallic boss 1.
  • the prescribed tightening power is given by hot pressing of the moulded resin body 2 in the heated state on the outer circumference of the metallic boss 1 , and thereafter cooling.
  • the outer circumference of the metallic boss 1 is heated by high frequency induction heating to a temperature at which the resin of the moulded resin body melts or higher, and the part of moulded resin body 2 that touches this metal surface is melted, and both metallic boss 1 and moulded resin body 2 are heated and melted against each other.
  • the melted resin that is produced in this heating and melting process flows out, while expelling air that has been enclosed in the interstices between the outer circumferential surface of the metallic boss 1 and the inner circumferential surface of moulded resin body 2, out of the moulded resin body 2.
  • the melted resin 2a that flows out is pressed out into the level differences of the lower surface at both ends of the moulded resin body 2 and both side surfaces at the upper end of the metallic boss 1, and cools and solidifies, and a moulded resin article with a metallic boss is obtained.
  • the moulded resin article with a metallic boss that has been obtained as described above can be converted to a cogwheel part by sawtooth processing in the outer surface of the moulded resin body 2, or it can be used as revolving articles such as wheels and rollers etc., and as construction members for tightening of industrial machinery and machine tools etc.
  • moulded resin body 2 has been moulded from a polyamide resin, it is suited as a raw material for machine parts for precision devices such as electronic machinery, because it can be used without oil supply. Because in the moulded resin article with a metallic boss and the process for preparing such an article according to this invention, a metallic boss that has been preprocessed by forging etc., is used, metallic bosses with various forms of the side surfaces can be obtained in a simple way, and because in addition melted resin 2a that flows out, cools and solidifies without protruding from the side surface of the moulded resin body 2, mass production with a good efficiency is possible without afterprocessing in order to form one surface with the side surface of moulded resin body 2.
  • Figure 1 is a cross section of a moulded resin article with a metallic boss that has been obtained by the process of the present invention.
  • Figure 2 is a cross section of another example of a moulded resin article with a metallic boss that has been obtained by the process of the present invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

A moulded resin article with a metallic boss (1) and the method of production thereof, wherein afterprocessing of the article is not necessary, and wherein processing waste wherein scraps of metal and resin have been mixed, is not produced, are offered. This is achieved by retaining the melted resin (2a) that flows out to the outside of the moulded resin body in the side surface (1a) of the metallic boss, so that it does not protrude from the side surface of the moulded resin article.

Description

MOULDED RESIN ARTICLE THAT HAS A METALLIC BOSS AND PROCESS FOR THE PRODUCTION THEREOF
This invention relates to a moulded resin article that has a metallic boss, and a process for the production thereof, and it particularly relates to a process for the production of a moulded resin article with a metallic boss that does not require afterprocessing of the metallic boss, and wherein processing waste, wherein scraps of metal and moulded resin body have been mixed, is not produced.
From the viewpoint of the rate of successful production, in general hitherto the following method is often used as a method to obtain a moulded resin article wherein the moulded resin body has been formed to one body at the outer circumference of a metallic boss: a moulded resin body is heated and melted to the outer circumference of a metallic boss and both are hereby united to one body by hot pressing the moulded resin body to the outer circumference of the said metallic boss, and thereafter cooling, and in which subsequently both are heated and melted together by melting the part of the moulded resin body that touches the outer circumference of the metallic boss by high frequency induction heating, and in which air that has been enclosed in interstices between the outer circumferential surface of the moulded resin body is expelled to outside the moulded resin body by melted resin.
That is to say that a tubular moulded resin body with a long length is united with a metallic boss with a long length by pressing and hot melting it to the outer circumference of the metallic boss, and that a number of intermediary raw materials that contain a metallic boss, are produced by slicing the moulded resin article to discs with a prescribed thickness.
Subsequently, individual afterprocessing of the side surface sections of the metallic boss of the said intermediary raw material by a lathe etc. is carried out, in order to obtain reduction of weight of the final product, and to give the necessary form to the side surface section of the metallic boss. In the above mentioned state of the art, a number of processings such as a slicing operation and afterprocessing of the metallic boss are necessary in order to produce the intermediary raw material, and disposal of the mixed waste of metal and resin that is produced by this afterprocessing, is a problem.
This invention has the aim to offer a moulded resin article with a metallic boss and a process for the production thereof wherein the above mentioned problems have been solved. This aim is achieved in a process in which a metallic boss, that in advance has been processed to its final form is used, and in which melted resin that flows out to the outside of the moulded resin body is retained in one or more side surfaces of the metallic boss and solidified by cooling, so that the resin is not protruding from the side surface of the moulded resin article.
Preferred is a process in which at least one recess for retention of melted resin is established in the side surface of the metallic boss, melted resin is retained in the said recess, and the retained resin is solidified by cooling , in such way that the resin forms one surface with the side surface of the moulded resin article.
Another preferred embodiment of the invention is a process in which the width of the moulded resin body is wider than the width of the metallic boss, and melted resin is solidified by cooling, while being retained in the level differences of both. Resins suitable for the present invention may be selected from high performance polymers with high thermal stability and good mechanical properties, such as polyesters, polyamides, fluoropolymers, polyketones (like PEEK, PEAK, PEKK), polyimides (like PAI), etc. Also, the coefficient of thermal expansion of the resin material should be close to the coefficient of thermal expansion of the metallic boss to preserve the integrity of the joined resin-metal body. The most preferred resins for use in production of worm gears are polyamides (like nylon 6, nylon 12, nylon 4,6) and polyacetals. In the preferred embodiments, a moulded polyamide resin body with inside diameter similar to the diameter of the metallic boss is pressed over the metallic boss to produce a nylon coated steel worm gear.
Moulded resin articles according to the present invention may be obtained from a wide variety of metals, such as steel, iron, brass, bronze or aluminum. Choice of a suitable metal depends on the desired mechanical characteristics of the end product. For production of worm gears for automotive power steering systems requiring high load, energy and torque capacity, the preferred metal is steel.
In an embodiment of the invention, the metallic boss may be obtained by sintering of powder metal, i.e. by pressing powder metal and then heating the pressed metal. Various metals, such as steel, brass, aluminum or bronze may be used in the invention. The powder metal is placed into a die of a desired shape and compacted or pressed to form the unitary metallic boss of the desired configuration. The pressed metal particles are held together by inter- particle friction to form a "green-compact". The green compact is then placed into a furnace and heated to a temperature which is less than the melting temperature of the metal but which is sufficiently high to soften the metal particles and cause coalescing of the interfaces between the particles to unify the structure into a sintered metal matrix. The resulting structure is inherently porous. The metal body can be formed or sintered into a wide variety of final forms, from simple bars or rods to more complex irregular shapes depending on the end use of the final product. When the end product is a worm gear for a power steering system, the preferred powder metal is stainless steel powder.
In cases an improved adhesion between the moulded resin body and the metallic boss is needed, use can be made of a silane coupling agent, a primer or epoxy based adhesives, at the interface. After the moulded resin body is pressed over the metallic boss, the metallic boss is heated, preferably by an induction coil, to a temperature slightly above the melting temperature of the resin causing the resin surrounding the metallic boss to melt. The molten resin flows to and fills the pores, voids, cavities and other irregularities on the surface of the metallic boss. The joined body is then cooled below the melting temperature of the resin, the resin solidifies and bonds adhesively and mechanically to the metallic boss. In the case of a metallic boss, made via a powder sintering process, and due to the high porosity of the sintered powder metallic boss, the bonding forces between moulded resin body and the metallic boss are significantly stronger than the bonding forces in articles based on moulded and knurled metallic bosses. This embodiment of the present invention allows the elimination steps of grit blasting of a knurled metallic boss, cleaning the metal surface, and using a silane coupling agent often necessary to achieve good bonding between the metallic boss and the surrounding moulded resin body. The invention relates also to a metallic boss in its final, end-use, form. From a metal bar metallic bosses can be shaped to their final form. To be useful in the process of the present invention, the shaped metallic boss is having at least one recess at its side surface to accommodate for the takeup of melted resin while preparing the moulded resin article. Preferably, the metallic boss is made by a powder sintering process.
The moulded resin article of the present invention is made by hot pressing a moulded resin body to the outer circumference of a metallic boss and joining the parts together using high frequency induction heating. The process for high frequency induction heating as such is known in the art. It generally uses a frequency of 0.5-200 kHz in a period of from 10-200 sec, this being dependant of the melting point of the resin in the moulded resin body. The temperature to which the metallic boss is heated, is slightly above the melting temperature of the resin; in the case nylon-6 is used, said temperature is in the range of 240-260°C. Below, the present invention is exemplified in the form of figures.
Figure 1 is a cross section of an example of a moulded resin article with a metallic boss that has been obtained with the process of the present invention, and Figure 2 is a cross section of another example of a moulded resin article with a metallic boss that has been obtained with the process of the present invention. In Figure 1 , 1 is the metallic boss, and the said boss has been processed in advance tot the final form or to the form of an article that is close to the final form, by forging etc.
In the outer circumferential surface 1a of the metal boss, surface processing such as grid blasting is carried out in order to further reinforce the adherence of the metallic boss and the moulded resin body, and by excision of both sides of the outer circumferential side surfaces of said boss 1 in a circular form, recesses 1b for retention of melted resin are formed.
2 is the moulded resin body with the form of a hollow disc that has been formed from a polymeric resin, preferably a polyamide resin, the inner circumferential surface being moulded to a diameter that is 0.4-3% smaller than the outer diameter of the metallic boss 1.
Then the prescribed thightening power is given by hot pressing of the moulded resin body 2 in the heated state on the outer circumference of the metallic boss 1 , and thereafter cooling. Subsequently, the outer circumference of the metallic boss 1 is heated by high frequency induction heating to a temperature at which the resin of the moulded resin body melts or higher, and the part of moulded resin body 2 that touches this material surface is melted, and both metallic boss 1 and moulded resin body 2 are heated and melted against each other.
The melted resin that is produced in this heating and melting process flows out, while expelling air that has been enclosed in the interstices between the outer circumferential surface of the metallic boss 1 and the inner circumferential surface of moulded resin body 2, out of the moulded resin body 2. Then the melted resin 2a that flows out, is retained in recesses
1b in the metallic boss 1, and if necessary are pressed in these recesses with the use of a pressing plate, so that finally the side surfaces of the three, metallic boss 1 , moulded resin body 2 and melted resin 2a that has flown out to the outside, become one surface, and they are cooled and solidified, and a moulded resin article with a metallic boss is obtained.
The volume of the space of recesses 1 b for retention, that are present in the metallic boss 1 , may be established by prior calculation of the quantity of melted resin 2a that flow outs from moulded resin body 2.
Subsequently, details of another example of the present invention that is shown in Figure 2, are described.
1 in the figure is a metallic boss, and the said boss is processed in advance by forging etc., to the final form or to the form of an article that is close to the final form. In the outer circumferential surface of the metallic boss 1 surface processing such as grid blasting is carried out in the same way as in Figure 1. 2 is a moulded resin body with the form of a hollow disc that has been moulded from a polymeric resin, preferably polyamide resins. The inner circumferential surfaceof moulded resin body is moulded to a diameter that is 0.4- 3% smaller than the outer diameter of the metallic boss 1 , the width W of the moulded resin body 2 being a little wider than the width of the metallic boss 1. Then the prescribed tightening power is given by hot pressing of the moulded resin body 2 in the heated state on the outer circumference of the metallic boss 1 , and thereafter cooling.
Subsequently, the outer circumference of the metallic boss 1 is heated by high frequency induction heating to a temperature at which the resin of the moulded resin body melts or higher, and the part of moulded resin body 2 that touches this metal surface is melted, and both metallic boss 1 and moulded resin body 2 are heated and melted against each other.
The melted resin that is produced in this heating and melting process flows out, while expelling air that has been enclosed in the interstices between the outer circumferential surface of the metallic boss 1 and the inner circumferential surface of moulded resin body 2, out of the moulded resin body 2. The melted resin 2a that flows out, is pressed out into the level differences of the lower surface at both ends of the moulded resin body 2 and both side surfaces at the upper end of the metallic boss 1, and cools and solidifies, and a moulded resin article with a metallic boss is obtained.
Because consequently the resin that is cooled and solidified, is retained in the above mentioned level differences, without protruding from the side surface of the moulded resin body 2, it is not necessary to carry out afterprocessing in order to cut them away to form one surface with the side surface of moulded resin body 2.
The moulded resin article with a metallic boss that has been obtained as described above, can be converted to a cogwheel part by sawtooth processing in the outer surface of the moulded resin body 2, or it can be used as revolving articles such as wheels and rollers etc., and as construction members for tightening of industrial machinery and machine tools etc.
Particularly in the case that moulded resin body 2 has been moulded from a polyamide resin, it is suited as a raw material for machine parts for precision devices such as electronic machinery, because it can be used without oil supply. Because in the moulded resin article with a metallic boss and the process for preparing such an article according to this invention, a metallic boss that has been preprocessed by forging etc., is used, metallic bosses with various forms of the side surfaces can be obtained in a simple way, and because in addition melted resin 2a that flows out, cools and solidifies without protruding from the side surface of the moulded resin body 2, mass production with a good efficiency is possible without afterprocessing in order to form one surface with the side surface of moulded resin body 2.
Moreover, worrying about disposal of mixed processing waste of metal and resin scraps, that are produced by the afterprocessing as in the past, is not necessary. Brief description of the figures
Figure 1 is a cross section of a moulded resin article with a metallic boss that has been obtained by the process of the present invention.
Figure 2 is a cross section of another example of a moulded resin article with a metallic boss that has been obtained by the process of the present invention.
Description of the symbols in the figures
1 metallic boss
1a outer circumferential surface of the metallic boss
1 b recess for retention of melted resin moulded resin body a melted resin

Claims

1. Process for the production of a moulded resin article with a metallic boss, in which a moulded resin body is heated and melted to the outer circumference of a metallic boss and both are hereby united to one body by hot pressing the moulded resin body to the outer circumference of the said metallic boss, and thereafter cooling, and in which subsequently both are heated and melted together by melting the part of the moulded resin body that touches the outer circumference of the metallic boss by high frequency induction heating, and in which air that has been enclosed in interstices between the outer circumferential surface of the metallic boss and the inner circumferential surface of the moulded resin body is expelled to outside the moulded resin body by melted resin, wherein a metallic boss, that in advance has been processed to its final form is used, and in which the melted resin that flows out to the outside of the moulded resin body is retained in one or more side surfaces of the metallic boss and solidified by cooling, so that the resin is not protruding from the side surfaces of the moulded resin article.
2. A process according to claim 1 , wherein at least one recess for retention of melted resin is established in the side surface of the metallic boss, melted resin is retained in the said recess, and the retained resin is solidified by cooling in such a way that the resin forms one surface with the side surface of the moulded resin article.
3. Process according to anyone of claims 1-2, wherein the width of the moulded resin body is wider than the width of the metallic boss, and melted resin is solidified by cooling, while being retained in the level differences of both.
4. Proces according to anyone of claims 1-3, wherein the moulded resin body is predominantly made of nylon or polyacetals.
5. Process according to anyone of claims 1-4, wherein the metallic boss is predominantly made of steel.
6. Process according to anyone of claims 1-5, wherein the metallic boss is made via a powder sintering process.
7. Metallic boss in its final form having at least one recess at its side surface.
8. Metallic boss according to claim 7, wherein the metallic boss is made by a powder sintering process.
9. Moulded resin article obtainable by a process according to anyone of claims 1-4, or by using a metallic boss according to anyone of claims 7-8.
10. Cogwheel, wheel, roller or machineparts made from a moulded resin article according to claim 9.
PCT/NL2001/000317 2000-04-25 2001-04-20 Moulded resin article that has a metallic boss and process for the production thereof WO2001081071A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001250676A AU2001250676A1 (en) 2000-04-25 2001-04-20 Moulded resin article that has a metallic boss and process for the production thereof

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JP2000124271A JP3789724B2 (en) 2000-04-25 2000-04-25 Resin molded product having metal boss and method for producing the same
JP2000-124271 2000-04-25

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EP2641724A1 (en) * 2012-03-23 2013-09-25 Neturen Co., Ltd. Core metal for resin welding, composite member and method of manufacturing the same
US9266282B2 (en) 2012-03-23 2016-02-23 Neturen Co., Ltd. Core metal for resin welding, composite member and method of manufacturing the same

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
JP6098527B2 (en) * 2014-01-14 2017-03-22 マツダ株式会社 Method of joining metal member and resin member

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Publication number Priority date Publication date Assignee Title
EP2641724A1 (en) * 2012-03-23 2013-09-25 Neturen Co., Ltd. Core metal for resin welding, composite member and method of manufacturing the same
US9266282B2 (en) 2012-03-23 2016-02-23 Neturen Co., Ltd. Core metal for resin welding, composite member and method of manufacturing the same
US10154547B2 (en) 2012-03-23 2018-12-11 Neturen Co., Ltd. Core metal for resin welding, composite member and method of manufacturing the same

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