CN109382513A - A kind of vacuum sintering furnace for catching wax apparatus and the application device - Google Patents

Abstract

The invention discloses a kind of vacuum sintering furnaces for catching wax apparatus and the application device; it solves the problems, such as after aspiration pump detaches the wax steam in sintering furnace to equipment damage; its key points of the technical solution are that; by outer tube and the cooling tube that is placed in outer tube and accumulates piece and formed and catch wax apparatus; wax is subjected to condensation condensation; to which the wax ingredient in the gas extracted out in furnace to be removed, achieve the purpose that protect equipment.

Description

A kind of vacuum sintering furnace for catching wax apparatus and the application device

Technical field

The present invention relates to a kind of powder metallurgy process equipments, more specifically, it relates to which one kind catches wax apparatus and application The vacuum sintering furnace of the device.

Background technique

With the development of modern industry, people are for various shape complexity, the demand of the high component of machine of performance requirement It measures increasing.Since machining and other processing technologys are in process due to the limitation of material, production is difficult, Wu Fajin The production of row batch, and the low efficiency processed, processing cost are expensive.It is unable to satisfy society at all for complex-shaped, high-performance The demand of engineering goods, the Metal Injection Molding in powder metallurgy forming technology just well solves in contrast This problem.

Metal powder injection molded is a kind of novel powder metallurgy near net for extending out from injection molding of plastics industry Forming technique, it is well known that the cheap price of injection molding of plastics technology produces the product of various complicated shapes, but plastic products Intensity is not high, in order to improve its performance, can add metal powder in the plastic to obtain the system that intensity is higher, wearability is good Product, in recent years, development evolvement is to improve the content of solids to the maximum extent and subsequent sintered to this idea Binder is completely removed in journey and makes to shape base densification.This new powder metallurgy formation method is known as metal injection moulding. The basic process steps of metal injection moulding are: being to choose the metal powder for meeting metal powder injection molded requirement and glue first Tie agent, powder and binder be then mixed by uniform feeding using method appropriate at a certain temperature, after pelletizing Injection moulding, the forming base of acquisition sintering densification after ungrease treatment become final finished.The volume of binder content point Number is generally in 40%-60%.

In binder of the metal injection molding blank when being sintered when temperature is higher than the boiling point of binder in blank It can evaporate in the form of a vapor.It not only can be to the product of sintering blank in furnace from the binder that can be issued in blank It can have an impact but also agglomerating plant can be damaged.So must be taken away in sintering process by ventilating body in furnace The binder of appearance.The process of dewaxing is to use process gas that the adhesive tape evaporated in product is come out of the stove outside as carrier. In addition to having other than the part of wax collecting box collected inside, very very much not a part can be with current-carrying during furnace gas takes away forming agent The flowing of gas remains in the pump group of vacuum system, various valves, pipeline and electric elements, in inductor etc..Over time this Equipment will be caused to corrode and block by failing the nubbin being collected by wax collecting box a bit, this not only will affect the performance of equipment And the service life of equipment can be made to greatly reduce, eventually lead to the damage of equipment.Furthermore untreated gas is directly arranged to big Gas can cause environmental pollution.Therefore either from the protection or the consideration of Environmental Safety angle to equipment, as far as possible completely Remove carrier gas in binder be very important, remove binder wherein not only to the safety of equipment be it is very urgent and And the performance parameter to sintering blank is also very important.

In conclusion above since in blank, binder collects incomplete bring danger during the sintering process in order to overcome Evil, the device that blank generates binder during the sintering process can as much as possible be collected by needing to design one kind.

Summary of the invention

In view of the deficiencies of the prior art, the present invention intends to provide one kind to catch wax apparatus, it is to solve to take out The problem of taking wax exhaust gas aspiration pump to be easily damaged.

To achieve the above object, described outer the present invention provides the following technical scheme that one kind catches wax apparatus, including outer tube It is equipped in pipe and catches wax frame, the wax frame of catching includes cooling strut and rack-mount accumulates piece, the cooling strut Setting is in hollow structure, and the both ends of outer tube are respectively equipped with air inlet pipe and exhaust tube.

By using above-mentioned technical proposal, the air inlet pipe on outer tube can connect sintering furnace, and exhaust tube can connect pumping Air pump is evacuated, so that the wax exhaust gas evaporated in sintering furnace be detached, since wax exhaust gas is high-temperature gas, is being extracted out Afterwards, it is removed by way of cooling condensation, prevents it from entering in aspiration pump.It is cold to go strut using hollow structure energy Enough allow inside it and be passed through coolant liquid or cooling gas, and by accumulate piece by outer tube gas it is as much as possible with It contact and then exchanges heat, and wax is allowed to be solidified.

The present invention is further preferred are as follows: described accumulates piece setting body structure in the form of sheets, and is mounted on cooling strut, institute It states and accumulates piece outer diameter and outer tube wall there are gaps.

By using above-mentioned technical proposal, laminated structure accumulates piece its contact area can be allowed bigger, and same heat is handed over Change that efficiency is relatively high, in addition, the setting in gap can allow exhaust gas to pass through.

The present invention is further preferred are as follows: the described piece edge that accumulates equipped with bending part, and the adjacent bending part for accumulating piece around The angle of cooling strut is 120-180 degree.

By using above-mentioned technical proposal, the setting of bending part can allow gas to pass through from bending part position, extract When gas, since air-flow is than very fast, and the gap of the position of bending part is bigger, so that air-flow can be from bending part location stream It walks, and allows air-flow to be capable of forming the trend of S type the setting of the circular angle between bending part, and then allow and air-flow and accumulate piece Contact area increases, and then makes the effect of condensation more preferable.

The present invention is further preferred are as follows: the bending part bending angle range is 15-60 degree.

By using above-mentioned technical proposal, the setting of bending angle is capable of increasing gap, and angle is bigger, and gap is bigger, gas Stream flows through speed faster, so that the time of condensation is short, when angle is greater than 60 degree, gas flow rate is too fast, leads to the wax in gas Do not condense completely, and when angle is less than 15 degree, flow velocity is excessively slow, and the wax for accumulating on piece close to exhaust tube position is very few, makes At the uneven and easy to form blocking of condensation.

The present invention is further preferred are as follows: the piece that accumulates is arranged to flight, the flight outer rim and outer tube wall There are gaps.

By using above-mentioned technical proposal, the structure of flight allows it to form the channel of gas flowing between outer tube, and And structure allows and is set on flight so that gas can sufficiently be contacted with flight in the shape of a spiral.

The present invention is further preferred are as follows: the cooling strut includes the cooling tube in hollow setting and is threaded through cooling Water-supply-pipe in pipe, the water-supply-pipe are threaded through in cooling tube, offer water outlet on the cooling tube.

By using above-mentioned technical proposal, water-supply-pipe is threaded through in cooling tube, by water-supply-pipe by cooling water or cold But liquid is transported in cooling tube, and water is discharged by water outlet, and cooling tube can be cooled down to piece is accumulated, into And wax can be allowed to be condensed.

The present invention is further preferred are as follows: the water-supply-pipe is worn from cooling tube one end to the other end, and water delivery tube end End wall with cooling tube is there are gap, and described water-supply-pipe one end is fixedly connected with cooling tube end, and the other end is equipped with pipe support pair Water-supply-pipe support, the water outlet are provided with cooling tube close to the position of the water inlet end of water-supply-pipe.

By using above-mentioned technical proposal, in end wall, there are gaps, and water can be allowed to enter cooling tube from water-supply-pipe, and During water delivery, first the water on cooling tube is cooled down, then directly cooling tube is cooled down by the water.Pipe support is set It sets and water delivery tube end is allowed to be able to carry out stabilization.

The present invention is further preferred are as follows: several heater strips of subsection setup on the outer tube, and each Duan Shangjun on outer tube It is provided with temperature sensor.

By using above-mentioned technical proposal, is allowed on outer pipe surface using the setting of heater strip and form certain temperature, will managed The wax condensed on wall is melted, so that it can be collected the wax of a part solidification.

The present invention is further preferred are as follows: the outer tube is equipped with pressure sensor close to the position of air inlet pipe.

By using above-mentioned technical proposal, the setting of pressure sensor can allow it to carry out the pressure of the gas in outer tube Measurement, thus the convenient vacuum state that can read the sintering furnace communicated therewith.

It is another object of the present invention to be detached internal wax steam by aspiration pump to provide a kind of vacuum sintering furnace And condense, reduce its influence to properties of product, while reducing damage of the wax to equipment.

A kind of vacuum sintering furnace, including furnace body and aspiration pump, are connected with described above between the furnace body and aspiration pump Wax apparatus is caught, the air inlet pipe is connect with furnace sealing, and the exhaust tube and aspiration pump are tightly connected, and outer tube is inclined sets It sets.

Make the wax exhaust gas that furnace body is interior to be generated when being sintered logical by catching the setting of wax apparatus by using above-mentioned technical proposal While crossing aspiration pump and detach, it can allow and catch wax apparatus wax is removed, to it will not be entered in aspiration pump and right Aspiration pump damages.

In conclusion the present invention can allow the wax entered in the gas in aspiration pump to be removed, reduces aspiration pump and exist In pumping process by wax be set in inside its equipment and caused by damage probability.In addition the setting for using heater strip, allows and catches Wax frame will not wax can collect uniformly allow its will not only the position of air inlet pipe condensed, allow part of it can Enter it is subsequent condensed, make the utilization rate for catching wax frame relatively high, and will not block easily.

Detailed description of the invention

Fig. 1 is the overall diagram of the present embodiment；

Fig. 2 is the cross-sectional view for catching wax apparatus way of example one；

Fig. 3 is the enlarged drawing in Fig. 2 at A；

Fig. 4 is the structure chart of fixation kit；

Fig. 5 is fixed sleeving structure chart.

Fig. 6 is the structure chart for catching wax apparatus internal structure way of example two.

Appended drawing reference: 1, furnace body；2, wax apparatus is caught；21, outer tube；211, groove；22, cooling tube；221, water outlet；23, Water-supply-pipe；231, bend pipe；24, pipe support；241, annulus；242, connection ring；243, cooling strut；25, piece is accumulated；251, it bends Portion；26, heater strip；27, temperature sensor；281, fixed sleeving；282, tightening nuts；283, pyramidal structure；284, ring body； 285, section of jurisdiction；286, tube body；3, wax collecting box；4, aspiration pump；5, pressure sensor；6, air inlet pipe；61, branch pipe；7, exhaust tube；8, Insulating layer.

Specific embodiment

Present invention will now be described in detail with reference to the accompanying drawings..

Embodiment 1: a kind of vacuum sintering furnace, as shown in Figure 1, including furnace body 1 and being mounted on furnace body 1 and catch wax apparatus 2, it catches wax apparatus 2 and includes outer tube 21 and be mounted in outer tube 21 and catch wax frame.Several heating are set on the outer wall of outer tube 21 Silk 26.Catching wax frame includes that bracket and several be arranged on bracket accumulate piece 25.Wherein bracket includes a hollow setting Cooling tube 22 and the water-supply-pipe 23 being threaded through in cooling tube 22, water-supply-pipe 23 are passed into cooling tube 22, in cooling tube 22 One end is provided with water outlet 221, and water is sent in cooling tube 22 from water-supply-pipe 23, and cooling tube 22 accumulates piece to mounted thereto 25 are cooled down, and are flowed out using water outlet 221.

As depicted in figs. 1 and 2, an exhaust tube 7 and air inlet pipe 6 are provided on outer tube 21, air inlet pipe 6 and furnace body 1 are close Envelope connection, exhaust tube 7 connect aspiration pump 4, and 21 level height of outer tube gradually increases setting from air inlet pipe 6 to exhaust tube 7.In furnace body 1 Exhaust gas passes through negative pressure, is pulled out, into outer tube 21.It is cooled down in outer tube 21 by accumulating piece 25, in turn, the wax in exhaust gas It is condensed, is bonded in and accumulates on piece 25.Gas to extract out from exhaust tube 7 no longer has wax substantially, exists in this way, reducing wax The probability condensed in aspiration pump 4, and then aspiration pump 4 can be allowed to be reduced by the probability of the damage of wax.

As shown in Fig. 2, water-supply-pipe 23 is penetrated from 22 one end of cooling tube and is directly worn to other end of end, water-supply-pipe 23 there are gaps with the end of 22 inner wall of cooling tube.The water outlet 221 of cooling tube 22 is placed in the water inlet end of water-supply-pipe 23, in this way, When water conveying is come in, it is fed first to other end, is flowed out by other end, then is flowed out from identical one end, thus A point both ends are not needed when water receiving pipe to connect, save the arrangement of water pipe, in addition, the same end passes in and out, only need to open on outer tube 21 A port just can complete the conveying of the water in cooling tube 22, and then the port for reducing outer tube 21 opens up, and increase outer The leakproofness of pipe 21.

As shown in Figures 2 and 3, one end of water inlet end is provided with pipe support 24 in water-supply-pipe 23, water-supply-pipe 23 is threaded through In pipe support 24, it is erected at by pipe support 24 in hollow cooling tube 22.Bend pipe is equipped with away from the end of water inlet end in water-supply-pipe 23 231, it is arranged by bend pipe 231, water-supply-pipe 23 by pipe support 24 while can be taken out of when being placed and taken out, water-supply-pipe is facilitated 23 installation and removal.Pipe support 24 is that centre has an annulus 241 and in 241 surrounding of annulus there is cooling strut 243 to be supported, Water-supply-pipe 23 is threaded through in annulus 241, for convenience the contact of cooling strut 243 and cooling tube 22, in the outer of cooling strut 243 Enclose one circle connection ring 242 of setting, the setting equal with the internal diameter of cooling tube 22 of the outer diameter of ring.Such process that installation is set In, directly pass through the access of connection ring 242, facilitate the insertion of water-supply-pipe 23, in addition, being supported using cooling strut 243, stays Lower gap, facilitates passing through for water.

As shown in Figures 2 and 3,25 outer diameter of piece is accumulated to be adapted with the internal diameter of outer tube 21, that is, accumulate piece 25 and outer tube 21 it Between there are fine clearance, can ensure to accumulate the installation of piece 25 as in outer tube 21.25 edge of piece is being accumulated equipped with bending part 251. The setting of bending part 251 can to accumulate the opening of the gap between piece 25 and outer tube 21, form a ventilation port, facilitate air-flow Pass through.The adjacent bending part 251 for accumulating piece 25 is 120-180 degree around the angle of cooling strut 243；It is i.e. adjacent to accumulate the curved of piece 25 The projection angle difference 120 that folding part 251 accumulates on piece 25 wherein one arrives 180 degree.In general, in order to allow air-flow to show S The trend of type, complete whole are axisymmetricly arranged.And when 120, the fast speed of air-flow can be allowed, but accumulate the portion of piece 25 Quartile, which is set, to be contacted completely with gas, so that the effect is relatively poor.And when 180, the completely S-type trend of air-flow, energy It is enough effective it is inswept it is each accumulate piece 25, although air velocity is slower, its effect is more preferable.If bending part 251 is bent It is too small, then gas can not be allowed to flow the trend to form S type, air-flow can directly be flowed away by gap, make wax long-pending to be not achieved The purpose stayed can not allow the area for accumulating piece 25 to be effectively utilized, and therefore, generally the angle of bending part 251 is arranged In 15-60 degree；30 or 45 degree are preferred angle, and the gap reserved in this way is relatively large, air-flow can be allowed to pass through, be formed simultaneously S The air-flow of type.

For sintering furnace when processing different products, the amount of the wax used is not identical, at this point, the spacing for accumulating piece 25 can also To be according to circumstances adjusted.The rear spacing adjusted can float between 5-15cm.The spacing for accumulating piece 25 can be directly whole Root is replaced, and achievees the purpose that adjusting, can also be fixed with fixation kit, then be adjusted in a relaxed state.Such as Shown in Fig. 4 and Fig. 5, fixation kit includes a fixed sleeving 281 and tightening nuts 282, and fixed sleeving 281 includes by several Section of jurisdiction 285 surrounds the tube body 286 to be formed and molding ring body 284 is fixed in section of jurisdiction 285 for accepting section of jurisdiction 285, product It stays piece 25 to be mounted on tube body 286, is equipped with screw thread close to one end of ring body 284 in section of jurisdiction 285,282 one end of tightening nuts is also set It is equipped with screw thread, and other end inner wall is arranged tapered structure 283 and makes pyramidal structure 283 right by screwing tightening nuts 282 Section of jurisdiction 285 is locked, to be that section of jurisdiction 285 is tightly attached on cooling tube 22 and is fixed.

Subsection setup has several heater strips 26 on outer tube 21, as shown in Fig. 2, being added by heater strip 26 to outer tube 21 Heat.After wax condensation is completed, by the heating of heater strip 26, wax is allowed to melt, to be flowed into wax collecting box 3, completed to wax Collection, since the fusing point and boiling point of wax are relatively low, it is therefore desirable to which the temperature for controlling heating allows the temperature and shell of heating wire Internal temperature is more stable, is unlikely to that wax is allowed to vaporize, is re-introduced into air-extractor.In addition, entering outer tube in exhaust gas When interior, wax is directly condensed, then, most wax can all be condensed in 6 position of air inlet pipe, so that is entirely condensed catches Wax frame is only more effective in 6 position of air inlet pipe, and the ratio of subsequent stage wax condensation is relatively limited, and therefore, such case is unfavorable In entirely catching the effective use of wax frame resource, at this point, dividing housing 135 into several segments, and heating is successively respectively set on each section Silk 26 and temperature sensor 27 carry out the temperature of control various pieces.Such setting, during catching wax, air inlet pipe 6 The temperature setting set it is relatively high, successively arrive 7 position of exhaust tube, temperature gradually decreases, in this way, air inlet pipe 6 condense wax Just than relatively limited, front end will not be all condensed in, and then subsequent part can successively be coagulated remaining part wax Knot, to the last, this set can allow subsequent wax frame of catching to be acted on, and then wax can be allowed uniformly to condense in and catch wax frame On, in this way, gas during flowing, will not just be flowed with this wax liquor drop soon condensed when having just enter into, And then the flowing velocity of gas can become faster.Meanwhile if previous section condensation is too fast, the gap that will cause ventilation is blocked, thus Cause the failure of equipment.

Insulating layer 8 is enclosed on the outer surface of outer tube 21, as shown in Fig. 2, heater strip 26 and outer tube 21 are wrapped, no It allows it to spill, on the one hand can play heat insulation effect in this way, and still further aspect can place exposed 21 temperature of outer tube Spend height and cause scald etc..Insulating layer 8 can use heat-preservation cotton, heat-preservation cotton is a kind of effective insulating materials, have it is light-weight, Anti-oxidant, the features such as thermal conductivity is low, flexibility is good, corrosion-resistant, thermal capacitance is small and sound insulation.Insulating layer 8 can also just use masking foil into Row heat preservation, masking foil can reflect the propagation of temperature, so as to prevent heat from distributing.In addition, insulating layer 8 can also be adopted Use aluminium foil.

As illustrated in fig. 1 and 2, in order to allow wax to melt collection after the completion of permanent set, outer tube 21 is inclined to set, and allows thawing Wax afterwards is flowed down along the inner wall of outer tube 21, and then is able to carry out the collection of wax, and if outer tube 21 tilts excessive, wax thawing Flowing velocity afterwards is excessive, and is not a kind of liquid after wax thawing itself, therefore be easy to cause the pipeline obstruction of circulation, thus The efficiency of collection is reduced, therefore, general inclined angle a is arranged between 5-30 degree, and if it is less than 5 degree, wax can be due to this The viscosity of body allows its stream not go down, and the purpose of collection is not achieved, and is greater than 30 degree and be easy to cause obstruction.And in order to allow the stream of wax Speed is relatively fast, also reduces the probability of blocking, generally can be positioned at 15 degree.In order to allow wax in final collection to be to become more square Just, groove 211 is set on 21 inner wall of outer tube, realizes the drainage to wax, so that collects is more efficient.It is needed after wax thawing It is collected, therefore state in a vertical shape is set in air inlet pipe 6, and be connected to groove 211, and then when wax flows through next, directly arrange Into wax collecting box 3, and it is provided with branch pipe 61 on the side of air inlet pipe 6, branch pipe 61 is allowed to connect with furnace body 1.

Embodiment 2: a kind of vacuum sintering furnace is substantially the same with embodiment 1, and main difference is accumulating setting for piece 25 It sets, in example 2, as shown in fig. 6, the setting of piece 25 helically chip architecture will be accumulated, provides air motion by flight Channel, flight rotate about close, then the distance of air-flow flowing is longer, the spacing for accumulating piece 25 being equivalent in embodiment 1 It is smaller.The setting of flight can effectively allow air-flow by distance as much as possible, to improve the effect of wax condensation.

Above two wax apparatus 2 of catching is tested, is evaporated using the wax of identical amount, is entered back into and catch wax apparatus 2 carry out catching wax test, finally detect the wax being collected into.Embodiment 1 catch that wax apparatus 2 finally measures to catch wax high-efficient Up to 98%.The wax efficiency of catching measured for catching wax apparatus 2 of embodiment 2 is up to 95%.

The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications It should be regarded as protection scope of the present invention.

Claims (10)

1. one kind is caught wax apparatus (2), including outer tube (21), wax frame is caught it is characterized in that: being equipped in the outer tube (21), it is described to catch Wax frame include cooling strut (243) and it is rack-mount accumulate piece (25), cooling strut (243) setting is in hollow Structure, the both ends of outer tube (21) are respectively equipped with air inlet pipe (6) and exhaust tube (7).

2. according to claim 1 catch wax apparatus (2), it is characterized in that: described accumulate piece (25) setting body structure in the form of sheets, And be mounted on cooling strut (243), it is described to accumulate piece (25) outer diameter there are gaps with outer tube (21) inner wall.

3. according to claim 2 catch wax apparatus (2), it is characterized in that: piece (25) edge that accumulates is equipped with bending part (251), and angle of the adjacent bending part (251) for accumulating piece (25) around cooling strut (243) is 120-180 degree.

4. according to claim 3 catch wax apparatus (2), it is characterized in that: the bending part (251) bending angle range is 15-60 degree.

5. according to claim 1 catch wax apparatus (2), it is characterized in that: the piece (25) that accumulates is arranged to flight, it is described There are gaps with outer tube (21) inner wall for flight outer rim.

6. according to claim 1 catch wax apparatus (2), it is characterized in that: the cooling strut (243) includes being in hollow setting Cooling tube (22) and the water-supply-pipe (23) that is threaded through in cooling tube (22), the water-supply-pipe (23) be threaded through cooling tube (22) It is interior, water outlet (221) are offered on the cooling tube (22).

7. according to claim 6 catch wax apparatus (2), it is characterized in that: the water-supply-pipe (23) is from cooling tube (22) one end Wear to the other end, and the end wall of water-supply-pipe (23) end and cooling tube (22) is there are gap, described water-supply-pipe (23) one end with Cooling tube (22) end is fixedly connected, and the other end is equipped with pipe support (24) and supports to water-supply-pipe (23), and the water outlet (221) is opened Cooling tube (22) are located at close to the position of the water inlet end of water-supply-pipe (23).

8. according to claim 1 catch wax apparatus (2), it is characterized in that: several heating of subsection setup on the outer tube (21) Silk (26), and temperature sensor (27) are provided on upper each section of outer tube (21).

9. according to claim 1 catch wax apparatus (2), it is characterized in that: position of the outer tube (21) close to air inlet pipe (6) Pressure sensor (5) are installed.

10. a kind of vacuum sintering furnace, including furnace body (1) and aspiration pump (4), it is characterized in that: the furnace body (1) and aspiration pump (4) be connected between it is as claimed in claims 1-9 catch wax apparatus (2), the air inlet pipe (6) and furnace body (1) are tightly connected, described Exhaust tube (7) and aspiration pump (4) are tightly connected, and outer tube (21) is inclined to set.