CN1036381C - A method of manufacturing an injection molding nozzle - Google Patents

Abstract

A method of manufacturing an injection molding nozzle having an electric heating element wound in a groove, wherein two end wires of the heating element extend from one common end or two separate ends thereof. After the heating element has been wound into the groove, the front and rear ferrules are mounted on the nozzle body to define therebetween a radial opening through which the end of the heating element projects, a stud mounted projecting from the opening having a single hole or two parallel holes for the end to project, and the elements are welded using a vacuum furnace. In one example a bushing with two parallel holes is mounted to the stud with ceramic paste and the end wires are connected to the outer conductors on the threaded cap through these holes.

Description

A method of manufacturing an injection molding nozzle

This invention relates generally to injection molding and, more particularly, to a method of making a one-piece nozzle with a heating element extending from between adjacent ferrules.

Injection molding nozzles have a helical integral electric heating element extending around a central melt hole, as is well known in the art. It is also known that having a portion of the heating element coiled back on itself can provide more heat over certain areas as seen in the inventor's US Patent No. 4,865,535, issued September 12, 1989 . Of course, each nozzle must have a terminal wire connected to the outer wire in order to transfer energy to the heating element. In the past, this was often provided by a heating element having a tip which protruded outwardly through a radial opening in the ferrule near the rear end of the nozzle. An example of this can be seen in US Patent No. 4,386,262, issued May 31, 1983 to the present inventor. In this case, the so-called "hot" terminals are cast from beryllium copper in a radially stretched sheath surrounding the heating element. While this terminal is structurally sound, it has the disadvantage that this terminal gets too hot and can cause damage due to overheating of the outer wire or other adjacent material, the other protruding outward through the opening in the ferrule over the end of the heating element An example of ® can be seen in US Patent No. 4,403,405 issued September 13, 1983 to the present inventor. Here, a gasket half is placed around the opening of the heating element to prevent the conductive beryllium copper from flowing out to the terminal. Because this solves the problem of overheating the terminal, it is called a "cold" terminal, but the disadvantage is that the terminal is not structurally strong, and it is difficult to ensure that the terminal protrudes straight out of the nozzle.

Another example of a method of making a terminal is described in the present inventor's US Patent No. 4,837,925, issued June 13, 1989, in which the end of the heating element protrudes from the bore of the ferrule. However, because it uses low voltage, the other end of the heating element is grounded to the nozzle body so that there is only a single terminal wire running to the terminal, so the ends of the heating element are relatively easy to solder to. A reliable terminal with two terminal wires is more difficult to manufacture than a terminal with only one terminal wire, because it is very important that the two projecting ends of the heating element run parallel to each other at a predetermined distance. In addition, the termination must be structurally strong and relatively easy to manufacture without requiring two distinct soldering steps.

It is therefore an object of the present invention to at least partially overcome the disadvantages of the prior art by providing a method of manufacturing a one-piece nozzle having a heating element projecting between adjacent ferrules.

Another object of the present invention is to provide a method of manufacturing a one-piece nozzle with a structurally strong termination. Here, the two end lines of the heating element are separated by a certain distance, and protrude radially from the nozzle body parallel to each other.

To this end, in one of its aspects, the present invention provides a method of making an injection molding nozzle comprising the steps of: making an elongated steel outer body with a front end, a rear end, a generally The outer surface of the cylinder has a fusion hole extending from the rear end to the front end along the center, and the insulated electric heating element located in the spiral groove on the outer surface of the steel is vacuum brazed as a whole. The heating element has an insulated heating wire extending in the shell , the improvement consists of the following steps:

(a) winding a heating element in a helical groove, the heating element having at least one end protruding radially outward from the groove near the rear end of the nozzle outer body;

(b) Fabricate a steel front ferrule with a rear surface and a circular opening extending therefrom centrally, the circular opening having a predetermined diameter to match the nozzle tip The outer surface of the exosome.

(c) Fabricate a steel rear ferrule with a rear surface, a front surface, and a circular opening extending centrally therefrom, the opening having a predetermined diameter to match the outer body of the nozzle at least one of the front ferrule and the rear ferrule is machined, whereby a radial opening is formed between the front and rear ferrules when the front of the rear ferrule abuts against the rear of the front ferrule;

(d) mounting the front ferrule around at least one protruding end of the heating element on the outer surface of the nozzle housing;

(e) Install the rear ferrule around the outer surface of the nozzle, the front surface of the rear ferrule is against the rear surface of the front ferrule, at least one end of the heating element passes through the radial direction formed between the front ferrule and the rear ferrule The opening protrudes radially outward;

(f) fabricating a steel pin having an inner end and an outer end, at least one hole passing through the pin from the inner end of the pin, the hole being adapted to receive at least one protruding end of the heating element;

(g) Install the steel pin so that it extends radially outward from the radial opening formed between the front ferrule and the rear ferrule, through at least one hole of the pin, and at least one end of the heating element extends outward a predetermined distance ;

(h) applying solder along the junction between the outer body, the front ferrule, the rear ferrule, the pin and around at least one end of the heating element passing through at least one hole in the pin;

(i) The assembled outer body, heating element, front ferrule, rear ferrule and pin are heated to a temperature higher than the melting point of the solder in a low-oxygen atmosphere of a vacuum furnace according to a predetermined cycle to melt the solder to form a metal The overall nozzle.

The method includes making spiral grooves on the outer surface of the nozzle body so that a double groove extends backward in a predetermined pattern from a U-shaped curved portion near the front end of the nozzle body, and the heating element is wound into the double groove, thereby heating The element has a U-shaped bend installed in the curved part of the groove, and two ends radially protrude from the groove near the rear end of the nozzle outer body to the double ends of the heating element; install the front ferrule, rear ferrule and The pins allow the two ends of the heating element to pass through radial openings formed between the front and rear ferrules and protrude radially outward through two holes in the pins.

The method further comprises machining at least one of the front and rear ferrules whereby a seat is formed around the radial opening between the front and rear ferrules by placing the inner end of the pin in said seat Install the studs.

Still further comprising: manufacturing the front ferrule with a forwardly extending insulating flange body spaced a predetermined distance outward from the outer surface of the nozzle body.

Still further comprising: manufacturing the nozzle with a smaller outer diameter portion near its rear end, and manufacturing at least the rear ferrule to fit over the smaller outer diameter portion of the nozzle body.

Still further comprising: making a nozzle body with an inwardly extending seat near its rear end, making a rear ferrule portion with an inwardly extending flange seated in said seat in said body, by Thus, the back end of the back ferrule is completely flush with the back end of the nozzle body.

Still further comprising: machining the rear face of the front ferrule and the front face of the rear ferrule to join when mounted adjacent to each other.

wherein the radially protruding ends of the heating element are longitudinally aligned and further comprising: machining front and rear ferrules whereby the two end portions of the heating element between the front and rear ferrules pass through The radial opening is a longitudinally extending opening to receive the ends of the longitudinally aligned heating elements.

It further includes: processing the rear ferrule such that the opening extends rearward from the front face of the rear ferrule.

It further includes machining the generally cylindrical pin portion such that a central bore extends a distance from the outer end to join the twin bores extending from the inner end.

wherein each end of the heating element has a bare wire extending outwardly to the corresponding end of the heating element, and comprising the following further steps:

(j) Fabricate a pair of elongated metal couplers, each coupler having a cylindrical outer surface, an inner end, an outer end, and a longitudinal hole extending from the inner end to the outer end to receive therein a bare terminal end of the heating element line and an inner and an outer longitudinally spaced transverse threaded hole passing from the longitudinal hole to the outer surface for receiving a set screw therein,

(k) Metal couplings fitted with a bare terminal wire each with a heating element extending through the inner end of the coupling into the longitudinal hole and beyond the inner threaded transverse hole,

(l) An insulator manufactured with a cylindrical outer surface, having an inner end, an outer end, and two spaced and parallel longitudinal holes leading from the inner end to the outer end for receiving metal connectors therein , and two more longitudinally spaced transverse holes leading from the respective longitudinal holes to the outer surface for insertion of the set screws therethrough,

(m) Install the insulator so that the inner end of the insulator is seated in the central bore of the pin, and install each metal coupler so that the coupler is placed in the longitudinal hole of the insulator, and the transverse threaded hole in the coupler is in contact with the insulator. Align the transverse openings of the couplers, insert a set screw through each transverse opening on the insulator into the aligned transverse screw holes on the coupler, and tighten the set screws in the threaded transverse holes on the inner side of the coupler to securely secure each coupler The device is connected to the bare terminal wire of the heating element extending here,

Thus, the bare end of an outer wire can be inserted into the longitudinal hole of each metal connector from the outer end, and beyond the threaded transverse hole at the outer end, by tightening the stop screw in the threaded transverse hole at the outer end of the coupler, the The bare ends of the wires are firmly connected to the coupler.

Further comprising: buckling the outer end of the pin, providing a hollow terminal boot, the boot has a threaded inner end, after the outer conductor is connected to at least the outer end of the insulator in order to extend outwardly through the insulator, the boot Mounted on the outer end of the pin assembly.

The method includes making a heating element with a dual heating wire in a single sleeve, from which extend a pair of spaced end wires, wrapping the heating element in a helical groove, a single end from adjacent the nozzle nozzle Protrude radially outward from the groove at the rear end of the outer body, and a pair of spaced end wires protrude outward from a single end of the heating element; make a pin section with a single hole through it; install the front ferrule, rear ferrule and a pin so that the single perforation of the heating element opens radially between the front and rear ferrules and protrudes radially outward through the single hole in the pin.

The method includes fabricating a bushing portion. The bushing has an inner end, an outer end, and two parallel bores spaced a predetermined distance from each other thereby extending from the inner end to the outer end; mounting the bushing portion to the stud so that a pair of end wires pass through both ends of the bushing The holes extend outward a predetermined distance.

Wherein the bushing part is made of ceramics.

Fig. 1 is a three-dimensional exploded view of various components of a nozzle, showing some steps of manufacturing a nozzle according to a preferred embodiment of the present invention.

Figure 2 is a schematic diagram showing the pattern of the heating element slots surrounding the outer surface of the nozzle body.

FIG. 3 is a perspective cross-sectional view showing additional components, showing further steps in manufacturing a terminal according to an embodiment of the present invention.

Fig. 4 is a perspective sectional view similar to Fig. 3, showing the steps of manufacturing a nozzle according to another embodiment of the present invention.

First, the illustration in Figure 1 shows the components of an injection molding nozzle with a double slot and a terminal with two terminal wires, and shows how they are assembled. A long outer body 10 is made of mold steel and has a melt hole 12 in its center leading from a rear end 14 to a front end 16 . Although the nozzle body 10 described in this embodiment is made of one piece, it could also be made of several longitudinal sections as described in the inventor's U.S. Patent No. 4,945,630 issued August 7, 1990. Then made to provide a variety of optional size, length. A spiral groove 18 surrounds the outer surface 20 of the nozzle body 10 . It is a double groove extending backward from a U-shaped bend 21 near the front end 16 of the nozzle body 10 . As shown in FIG. 2, the dual slots 18 are formed in a predetermined pattern to vary the heat supply along the surface 20 of the nozzle body 10 according to the needs of the system. In this embodiment, the double helical grooves 18 are denser near the rear and front ends 14, 16 of the outer body 10, so that more heat is provided to these parts than to the middle of the body 10. While the outer face 20 of the nozzle body 10 is generally cylindrical, in this embodiment, the nozzle body has a beveled body 22 at the front end 16, and near the rear end 14, a portion 24 of reduced diameter extending from one inward. Stretching seat 26 Ting stretches. An electric heating element 28 is encircled in the double helical groove 18 with a U-shaped bend 29 placed in the U-shaped curved portion 21 of the groove 18 and with an outward diameter near the rear end 14 of the body 10. The double-ended portion 30 protrudes to the double-ended head 32 . As is well known in the art, heating element 28 has a thin heating wire 34 extending from an insulator 36, such as magnesium oxide, within a steel sheath 38. The heater wires 34 are connected at respective ends 32 to terminal wires 40 . The terminal wires 40 are much larger in diameter than the thin heater wires, so they do not generate heat. In this embodiment, to prevent a short circuit between the heater wire 34 and the outer sleeve 38, the outer sleeve 38 is stripped back so that it is slightly shorter than the insulating material. A thin hollow thermocouple tube 42 extends longitudinally over the heating element 28 and is dry welded to the exterior surface 20 of the body 10 at a thermocouple hole 44 machined obliquely into the body 10 near the front end 16. middle.

The front ferrule 46 is made of steel and has a circular opening 48 of predetermined diameter for fitting over the outer surface 20 of the outer body 10. In this embodiment, the front ferrule 46 has an inwardly extending, A flange portion 50 forming a rear end face 52 , an insulating flange portion 54 extending forwardly from the rear flange portion 50 . The rear end face 52 of the front ferrule 46 has an outer arcuate seat 58 and an inner arcuate seat 56 of two seats which will be described in more detail below. The two protruding end portions 30 of 28 are aligned with arcuate seats 56,58. Even though the front ferrule 46 has a circular opening 48 (which matches the reduced diameter portion 24 of the outer surface 20), it is still too small to slide over the front end 16 of the body 10 by slid inwardly at an angle. It is mounted from the rear by moving it across the extended end 30 of the heating element 28 and then pivoting it forward on the rear end 14 of the body 10 into position.

The rear ferrule 60 is made of steel with a circular opening 62 extending centrally from a rear face 64 to a front face 66 . In this embodiment, the opening 62 is made to match the reduced diameter portion 24 of the outer surface 20 of the body 10, and the ferrule 60 has an inwardly extending flange 68 that is in contact with the rear end 14 of the body 10. Matches the inwardly extending seat 26 on the top. Likewise, the front surface 66 of the rear ferrule 60 has a forwardly extending inner bead 70 which engages the rear surface 52 of the front ferrule 46 when interconnected and supported. Of course, in other embodiments, the outer surface 20 of the body 10, the front ferrule 46 and the rear ferrule 60 can be made of various suitable shapes that match each other. The rear ferrule 60 has a radial opening 72 extending longitudinally from the front surface 66 . The outer wall 74 of the rear ferrule 60 has an inner seat 76 and a larger outer seat 78 surrounding the longitudinal opening 72 . These open seats 76, 78 on the rear ferrule 60 are formed in the form of rings. In addition, in this embodiment, a portion of each seat passes through the inner and outer arcuate seats 56 machined on the rear surface 52 of the front ferrule 46. , 58 formed. The rear ferrule 60 has a rear surface 64 which has an opening 80 for receiving thermocouple wires and a bolt hole 82 for receiving bolts for mounting and securing purposes. The rear ferrule 60 is mounted on the rear end 14 of the body 10 and has seats 76, 78 which surround the longitudinal opening 72 and are aligned with the arcuate seats 56, 58 of the front ferrule. The front surface 66 supports the rear surface 52 of the front ferrule 46, and the inner collar 70 engages the rear surface 52 to maintain the desired position. The inwardly extending flange 68 rests on the seat 26 surrounding the rear end 14 of the nozzle body 10 with the rear surface 64 of the rear ferrule 60 flush with the rear end 14 of the body 10 . The end 30 of the heating element extends outwardly through the opening 72 in the rear ferrule 60, and the inner and outer ring seats 76, 78 surrounding the opening 72 are formed by the front and rear ferrules 46, 60 respectively. In other embodiments, the front and rear ferrules 46, 60 may be joined differently to form the opening 72 or form a differently shaped opening therebetween.

Pin portion 84 is made of steel with two bores 86 extending from inner end 88 to a central bore 90 protruding from outer end 92 . The two holes 86 run parallel to each other and are separated by a predetermined distance. Each hole 86 is large enough to fit the outwardly projecting end 30 of the heating element 28 . Where pin 84 is generally cylindrical, there is a smaller diameter neck 94 on inner end 88 mating with inner seat 76 surrounding longitudinal opening 72 . As shown in Figure 2, when the neck 94 of the inner end 88 is seated in the inner seat 76 surrounding the opening 72, the pin 84 is installed, and the end 30 of the heating element 28 extends through the two parallel holes 86. out. This structurally supports the outwardly projecting ends 30 of the heating elements 28, ensuring that they extend radially outwardly in parallel at certain intervals.

When the above elements are mounted as shown in FIG. 3, solder, such as a nickel alloy paste, is applied to the joints between the elements and around the double end portion 30 of the heating element through the double holes 86 of the pins 84. Solder is also used along the heating element 28 wrapped in the helical groove 18 similar to that described in the present inventor's US Patent 4,557,685 issued December 10,1985. The assembly is then placed in a vacuum furnace, not shown, and heated at a temperature above the melting point of the solder on a regular basis. As the furnace heats up, it is drawn to a relatively high vacuum to draw almost all of the oxygen out. Before reaching the melting point of the solder, the vacuum in the furnace is partially reduced due to the backfilling of a part of inert gases such as argon and neon. As the nickel alloy solder melts, they flow along the joint between the elements and around the heating element 28 by capillary action to cast the element 28 in the groove 18 . The welding of the vacuum furnace makes the steel body of each part connect through the metallization of the nickel alloy to form a metallized monolithic high-temperature-resistant nozzle 96 . After the nozzle is cooled, it is removed from the vacuum furnace and machined to form a smoother outer wall. A thermocouple hole (not shown) is machined through the front and rear ferrules to connect the thermocouple slot 80 on the rear surface 66 of the rear ferrule 60 to the thermocouple tube 42 welded along the outer surface 20 of the body 10 . As shown in FIG. 3 , thermocouple wire 97 is inserted through the thermocouple hole and thermocouple tube 42 and bent outward through the thermocouple slot 80 to monitor the temperature near the front end 16 of the body 10 .

With particular reference to FIG. 3, an elongated metal connector 98 is formed each having an inner end 100, an outer end 102, a cylindrical outer surface 104, a longitudinal hole 106 large enough to receive bare wires therein . Each coupler 98 is also formed at its inner and outer ends with longitudinally spaced threaded holes 108 , 110 extending from the longitudinal bore 106 to the outer surface 104 . Each coupler is mounted on one end 32 of the radially protruding end 30 of the heating element 28, and the bare wire portion 40 extends from the inner end 100 of the coupler 98 into the longitudinal hole 106 and beyond the inner threaded transverse direction. Hole 108.

An insulator 112 has an inner end 114, an outer end 116 and a cylindrical outer surface 118 and is formed of a suitable ceramic insulating material. The insulator 112 also has two spaced apart parallel longitudinal holes 120 and two transverse holes 122 extending from the respective longitudinal holes 120 to the outer surface 118 at predetermined intervals in the longitudinal direction. The insulator 112 fits over the coupler 98 , and its inner end 114 is located in the middle opening 90 of the pin 84 . Each metal coupler 98 is placed in either longitudinal hole 120 of the insulator 112 , with the threaded slots 108 , 110 of the coupler 98 aligned with the transverse opening 122 of the insulator 112 . Afterwards, a set screw 124 is inserted into the aligned threaded transverse holes 108, 110 on the coupler 98 through the transverse opening 122 of the insulator, and the set screw in the internally threaded hole 108 of the coupler 98 tightens the protrusion of the heating element 28. The bare wire end 40 of the output end 30 is used to securely connect each coupler 98 to one end 32 of the heating element 28 . In other words, the coupler 98 is first inserted into the insulator 112 and then connected to the end 32 of the heating element 28 .

As shown in FIG. 3 , the bare ends 126 of external electrical leads 128 are inserted into the longitudinal holes 106 of each metal connector 98 from the outer ends 102 and beyond the externally threaded transverse holes 110 thereof. The set screw 124 in each hole 110 is then tightened to securely connect the wire 128 to the coupler 98 . Obviously, the bare wire portion 40 of the end 30 of the heating element 28, the bare end 126 of the wire 128 and the length of the coupler 98 must be determined in advance to ensure that they are securely connected. Also, the lengths of the end portion 30 of the heating element 28, the pin 84 and the insulator 112 must be predetermined to ensure that the metal coupler 98 is fully seated in the insulator 112. Finally, a hollow terminal boot 130 that has been placed over the conductor 128 is installed, extending outwardly from the pin 84 around the insulator 112. The protective sleeve 130 has a threaded inner end 132 which is threaded over the threaded pin body 84 which is seated in the outer seat 78 surrounding the longitudinal opening 72 . In addition to protecting coupler 98 and insulator 112, sleeve 130 adds structural strength to the terminal to prevent it from bending from its normal position.

In use, the gate insert 134 or nozzle seal (to provide the desired gate configuration) is mounted on the front end of the nozzle integral body 96 . One or more nozzles 96 are mounted on a suitable mold and insulating flanges 54 are placed in appropriate seats on the cavity plate to position and support the nozzles. The forwardly extending insulating flange end 54 is spaced a predetermined distance outwardly from the outer surface 20 of the body 10 to provide thermal insulation to prevent excessive heat loss. The nozzle 96 is heated to a predetermined operating temperature by a heating element 28 which can be supplied via a wire 128 to the nozzle nozzle 96 . Thereafter, the pressurized melt from the molding machine is injected, flowing through the central hole 12 of the body 10 of each nozzle 96 and into the mold cavity through a nearby gate. After the cavity is filled, the injection pressure is protected for a while to hold pressure and then depressurized. After a short period of cooling, the mold is opened to eject the molded product. Thereafter, the mold is closed and injection pressure is applied again to fill the cavity again. This cycle repeats continuously, and its frequency depends on the shape of the cavity and the type of material being molded.

Referring to FIG. 4 , a method of manufacturing an injection molding nozzle according to another embodiment of the present invention is described. Since some elements are the same or similar to those described above, the same elements are described and illustrated with the same reference numerals. In this embodiment, the heating element 28 is made of dual heating wires 136 extending within the insulating material 36 in a single sleeve 38 . Thus, rather than the overall heating element 28 (including the sheath 38 ) being made with a U-bend, the heating wire 136 itself has a U-bend near the front end 16 of the nozzle body 10 (not shown). The double heating wire 136 is connected to two large-diameter end wires 40 , which protrude outward from the single end 138 of the heating element 28 to the double end 32 , and the heating element 28 is radially adjacent to the rear end 14 of the nozzle body 10 . Extend outward.

Front ferrule 46 and rear ferrule 60 are fabricated and mounted as previously described with single end 138 of heating element 28 extending through aperture 140 therebetween. In this embodiment, the steel pin portion 142 has only a single hole 144 (extending therethrough), and has a threaded portion 146 extending from the outer end 148 to the small annular flange 150, the pin portion 142 Mounted in the seat 76 on the front and rear ferrule portions 46 , 60 , the single end 138 projects through the single hole 144 . The assembly is then integrally welded together in the aforementioned vacuum furnace.

In this embodiment, a generally cylindrical ceramic bushing portion 152 has a small circular flange 154 and two parallel holes 156 spaced a predetermined distance apart from an inner end 158 to an outer end 160. . The bushing portion 152 is securely mounted through the ceramic paste in the peg portion 142 with the flange 154 abutting the outer end 148 of the peg 142, as can be seen, the double ended wire extending from the single end portion 138 of the heating element 28 40 bifurcate at the hollow 162 of the pin portion 142 where ceramic paste surrounds them, and these double-ended wires 40 then protrude through the dual parallel holes 156 in the bushing portion 152 .

In use, the connection of the two electrical leads 128 is accomplished using a disc-shaped silicone rubber gasket 164 and a ceramic insulating sleeve 166 fixed on a threaded steel cap 168 . The gasket 164 is secured in an opening 170 at the outer end of the cap 168, and the gasket 164 and insulating sleeve 166 have a pair of spaced apart parallel holes 172 extending therethrough for receiving the two conductors 128. The cap 168 , the gasket 164 and the insulating sleeve 166 are put over the wire 128 and removed, and then the wire 128 is fixed to the protruding end wire 40 of the heating element 28 through the electrical connector 174 . Cap 168 , gasket 164 and insulating sleeve 166 then slide back into position around coupler 174 . Threaded cap 168 is screwed onto threaded pin portion 142 . Silicone rubber gasket 164 prevents moisture from entering the terminal. This arrangement provides great structural strength and simplifies connecting and disconnecting the wire 128 to the nozzle.

Although the manufacture of the high temperature manifold has been described in the preferred embodiment, it is clear that without departing from the scope of the present invention which is understood by those skilled in the art and defined in the following claims, Various improvements can be made. For example: In another embodiment, the heating element 28 has a sheath 38 with a sharp U-bend so that both the outward and return sheaths 38 extend side-by-side in the single helical groove 18 in contact.

Claims (11)

1, a kind of method of making injection mo(u)lding notes mouth, its step comprises makes the outer surface and that has rear end, front end, general cylindrical leads to the molten hole, center of front end from the rear end long steel ectosome, the electrical heating elements of one insulation is welded in the helicla flute of annotating on the mouth external surface with the overall vacuum method for brazing, electrical heating elements has an insulation heater wire that extends in overcoat, it is characterized in that improvement comprises following step:

(a) make the helicla flute that has two grooves on the outer surface of body, the helicla flute of this pair groove extends back with the U-shaped kink of predetermined figure from the front end of neighbouring body;

(b) with heating element heater in two grooves, therefore, the bending of U-shaped that heating element heater has is contained in the kink of groove and two ends radially outward protrude out two terminations of heating element heater near the groove the rear end of annotating the mouth ectosome;

(c) front ferrule of manufacturing steel, this front ferrule has the back and middle heart is passed the round opening of extension, and the circle opening has predetermined diameter to make it to be assembled on the outer surface of the ectosome of annotating mouth;

(d) the back lasso of manufacturing steel, this back lasso has the back, the front, middle heart is passed the round opening of extension, the circle opening has predetermined diameter to make it to be assembled on the outer surface of the ectosome of annotating mouth, at least one of front ferrule and back lasso is processed when making it front when the back collar against the back of the preceding collar, at the preceding collar with afterwards form radial bore between the collar;

(e), protrude out the place, end, the collar before installing two of adjacent heating element round the outer surface of the ectosome of annotating mouth;

(f) round the outer surface of the ectosome of annotating mouth, the back collar is installed against the back of the preceding collar in the front of the later collar, and makes two ends of heating element heater pass the radial bore that is formed between the preceding collar and the back collar;

(g) make the pin of steel, this pin has the inner, the outer end parallel with two with preset distance hole at interval, this two hole extends through pin and protrudes out the end to make it to hold two of heating element heater from the inner,

(h) pin that steel is installed extends radially outwardly with the radial bore that makes it to form between the lasso and back lasso in the past, and heating element heater two partly pass two holes in pin preset distance that stretches out;

(i) apply brazing material along the junction between ectosome, the preceding collar, the back collar and the pin, and apply brazing material round two ends that extend through two holes in the pin of heating element heater;

(j) heating ectosome, heating element heater, front ferrule, the assembly of back lasso and pin is to more than the fusion temperature of brazing material, this heating is to melt brazing material with predetermined circulation in the vacuum drying oven in low-oxygen environment, and with ectosome, heating element heater, front ferrule, the soldering integrally of back lasso and pin are annotated mouth with the integral body that forms metal together.

2, make the method that mouth is annotated in injection mo(u)lding according to claim 1, it is characterized in that, the radial bore between the lasso forms a seat round front ferrule and back to make it also to comprise at least one of processing front ferrule and back lasso, pin is installed so that the inner of this pin is received in the described seat.

3, annotate the method for mouth as manufacturing injection mo(u)lding as described in the claim 2, it is characterized in that, also comprise the processing front ferrule making it to have the insulating flange body that extends forward, this flange body is from the outside one section predetermined distance at interval of the outer surface of annotating the mouth body.

4, annotate the method for mouth as manufacturing injection mo(u)lding as described in the claim 2, it is characterized in that, also be included in the processing of adjacent back end place and annotate the mouth body and make it to have swedged part, and be that the back lasso installs to and annotates the reducing on the diameter parts of mouth body at least.

5, annotate the method for mouth as manufacturing injection mo(u)lding as described in the claim 2, it is characterized in that, make the seat that extends internally that the body of annotating mouth makes it to have adjacent back end, and make the back lasso and make it to have the flange section that extends internally, this flange section is contained in the described seat in the described body, thereby makes the rear end of back lasso concordant with the rear end of the body of annotating mouth in fact.

6, the method for annotating mouth as manufacturing injection mo(u)lding as described in the claim 2 is characterized in that, also comprise the back that process front ferrule and afterwards the front of lasso interconnect when its installation is abutted together so that make it.

7, annotate the method for mouth as manufacturing injection mo(u)lding as described in the claim 2, it is characterized in that, wherein the radial projection end of heating element heater is vertically alignment, and further to comprise the radial bore of extending between the lasso in front ferrule and back that processing front ferrule and back lasso pass with the end that makes it two heating element heaters be the opening of longitudinal extension, holds the vertically end of alignment of heating element heater so that make.

8, annotate the method for mouth as manufacturing injection mo(u)lding as described in the claim 7, it is characterized in that, also comprise processing back lasso to make it to have the described opening that extends back previously from the back lasso.

9, annotate the method for mouth as manufacturing injection mo(u)lding as described in the claim 2, it is characterized in that, the processing pin is to be roughly cylindrical so that centre bore extends preset distance and joins with the diplopore that extends from the inner from the outer end.

10, as annotating the method for mouth in the manufacturing injection mo(u)lding as described in the claim 2, it is characterized in that wherein each end of heating element heater has the bare wire end line, this bare terminal end alignment extends to corresponding heating element heater end outward, and comprises further step:

(k) make a pair of long metal couplings, each coupling has cylindrical outer surface, inner, the outer end, stretch out vertical hole of passing from the inner so that admit heating element heater bare wire end line among it, and the horizontal thread hole of inner end and outer end longitudinal pitch, this horizontal thread hole extends to outer surface from vertical hole so that admit stop screw;

(1) metal couplings that each has a bare wire end line of heating element heater is installed, the inner that this bare wire end line passes coupling extends into vertical hole and surpasses inner screw thread transverse holes;

(m) manufacturing one has the insulator of cylindrical outer surface, and this insulator also has the inner, outer end, vertical hole of two parallel distances.This vertical hole is run through from the inner to the outer end so that hold metal couplings in it, and two longitudinally-spaced transverse holes extend to outer surface from each vertical hole so that admit stop screw to pass wherein;

(n) insulator is installed, the inner of insulator is placed in the pin center bor, each metal compounds device is installed, hookup is placed in vertical hole of insulator, align with the transverse holes on the insulator in horizontal thread hole on the hookup, one stop screw is inserted the horizontal screw hole that has alignd on hookup through each transverse holes on the insulator, tighten limit screw in the inner screw thread transverse holes of hookup securely each hookup is connect mutually with the bare terminal line that stretches into the heating element heater here;

Thus, the naked termination of one outer conductor can be inserted vertical hole of each metal compounds device from the outer end, and surpass the screw thread transverse holes of outer end, by the stop screw in the screw thread transverse holes that is tightened in the hookup outer end, the naked termination and the hookup of lead coupled together securely.

11, annotate the method for mouth as the manufacturing injection mo(u)lding in the claim 10; it is characterized in that; further comprise: with the outer end hitch of pin; one hollow terminal protection cover is provided; this protection is with a threaded inner end; outer conductor was connected to the outer end of insulator at least in order outwards to extend through insulator after, protective sleeve was installed in the outer end of pin parts.

Images