CN107243632A - The cold seal formula degreasing flue and degreasing method of a kind of real-time temperature control - Google Patents
The cold seal formula degreasing flue and degreasing method of a kind of real-time temperature control Download PDFInfo
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- CN107243632A CN107243632A CN201710448868.1A CN201710448868A CN107243632A CN 107243632 A CN107243632 A CN 107243632A CN 201710448868 A CN201710448868 A CN 201710448868A CN 107243632 A CN107243632 A CN 107243632A
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- flue
- degreasing
- branch pipe
- exhaust branch
- cold seal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/003—Apparatus, e.g. furnaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1017—Multiple heating or additional steps
- B22F3/1021—Removal of binder or filler
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The present invention relates to the cold seal formula degreasing flue and degreasing method of a kind of real-time temperature control, the degreasing flue includes flue assembly, gas handling system, gas extraction system, cold seal water jacket and thermocouple, and the air inlet pipe of gas handling system is provided with multiple stomatas；Gas extraction system includes horizontal exhaust branch pipe, collection fat tank and vertical exhaust branch pipe, and collection fat tank is threadedly coupled with being used between horizontal exhaust branch pipe and vertical exhaust branch pipe；Cold seal water jacket includes water inlet and delivery port；The temperature-sensitive of thermocouple is partially disposed in flue assembly.The present invention improves temperature-controlled precision by real-time temperature control, airway blockage is improved using collection fat tank, effectively control degreasing base composition, reduce the defects such as degreasing base cracking, deformation, simple in construction, cost of the invention is low, operability is big, good airproof performance, temperature-controlled precision are high, safe and reliable, it is adaptable to powder injection forming thermal debinding process.
Description
Technical field
The present invention relates to a kind of gas degreasing plant of powder injection forming, especially, it is related to a kind of the cold of real-time temperature control
Envelope formula degreasing flue and the method that degreasing is carried out using above-mentioned flue.
Background technology
Powder injection forming (Powder Injection Molding, abbreviation PIM) is prior powder metallurgy technique and existing
For plastic injection moulding process be combined formed by a new near-net-shape technology.PIM processes are divided into several stages：It is former
Expect apolegamy, mixing, granulation, injection moulding, degreasing, sintering etc..Wherein, injection base before sintering must by binding agent therein from
Removed in powder, otherwise can cause the defects such as deformation, cracking, the composition pollution of product, that is to say, that skimming processes are PIM works
Most critical and most difficult link in skill.
In the prior art, skimming processes are often more complicated, and need combine a variety of degreasing modes, such as thermal debinding method,
Wiech methods, water-soluble solution, Metamold methods etc., but the above method can produce various defects.By taking thermal debinding method as an example, its mistake
Journey mainly includes：First, this is a chemical reaction process, the i.e. thermal decomposition of binding agent；Secondly, it is also the heat transfer of a physics
And mass transport process, that is, the binding agent decomposition gas formed is transferred to degreasing base surface and enters outside atmosphere.Therefore, thermal debinding is improved
Temperature-controlled precision not only contribute to the stable components of degreasing base, and can avoid produce face checking, underbead crack, reduce chi
The defect such as very little deviation and deformation.
At present, in the document about heat-treatment furnace, typically by measuring the temperature between body of heater and flue, then by operating
Personnel calculate the actual temperature in flue by experience, then carry out temperature control to body of heater again；In PIM techniques, debinding furnace
Specificity is strong, cost is higher；In addition, conventional heat-sealable flue is difficult to meet the carbon content control for skimming processes.
Therefore, in order to reduce thermal debinding cost, adapt to laboratory actual demand, raising temperature-controlled precision and carbon content control,
The cold seal formula degreasing flue for researching and developing real-time temperature control is significant.
The content of the invention
In order to make up the deficiencies in the prior art, it can reduce thermal debinding cost the invention provides one kind, adapt to laboratory
Actual demand, the atmosphere debinding furnace for improving temperature-controlled precision and carbon content control, the cold seal formula degreasing of particularly a kind of real-time temperature control
Flue, including flue assembly, gas handling system, gas extraction system, cold seal water jacket 8 and thermocouple 11, the flue assembly include flue
Main body 9, flue lid 2 and branch pipe 3, are attached between flue main body 9 and flue lid 2 using bolt, using viton seal ring
Sealed, branch pipe 3 is welded on flue lid 2；The gas handling system includes air inlet pipe 10, and its one end is arranged on outside flue assembly
In portion, other end insertion flue main body 9, multiple stomatas are provided with；The gas extraction system includes collection fat tank 4, horizontal exhaust
Branch pipe 5, vertical exhaust branch pipe 6, between collection fat tank 4 and horizontal exhaust branch pipe 5, collect and are adopted between fat tank 4 and vertical exhaust branch pipe 6
With threaded connection；The cold seal water jacket 8 is arranged on the outside of flue main body 9, including water inlet 1, delivery port 7；The thermocouple
11 one end are arranged on outside flue assembly, and the other end is temperature-sensitive part, and flue main body 9 is inserted by the branch pipe 3 on flue lid 2
It is interior, rubber seal is used between thermocouple 11 and branch pipe 3.
Preferably, the collection fat tank 4 is used to collect organic binder bond decomposition composition.
Preferably, the air inlet pipe 10, be provided with valve on vertical exhaust branch pipe 6.
Present invention also offers a kind of degreasing method carried out using above-mentioned degreasing flue, comprise the following steps, 1) pass through
Degreasing flue is positioned in muffle furnace hearth by riser guide, and wherein debinding furnace gallbladder-heat treatment region is placed in burner hearth uniform temperature zone, cold seal
Part is exposed, in addition to cold seal water jacket 8, and remaining exposed parts wraps asbestos, is used between degreasing flue and Muffle furnace fire door
Asbestos are sealed；2) the step-like Ultra-fine Grained WC/12Co injection moulding bases after solvent degreasing are positioned over boat, by three-layer type
Stainless steel welded baffle plate is positioned over the rear end of debinding furnace gallbladder-heat treatment region, and stainless steel welded gear is abutted in degreasing flue exposed parts
Plate arranges insulating brick, and gas channel is left in stainless steel welded baffle plate and insulating brick periphery；3) ON cycle cooling water so that cold
But water jacket 8 is in running order；4) before protective gas is passed through, the valve closed on vertical exhaust branch pipe 6 opens vavuum pump,
Pass through the forvacuum of air inlet pipe 10 and pre- inflated with nitrogen；5) valve in air inlet pipe 10 is opened, protective gas is passed through, by examining hydrogen
After gas purity, hydrogen is lighted in the vertical exit of exhaust branch pipe 6, with adjusting gas flow size；6) computer heating control platform is opened, is pressed
Begun to warm up according to pre-set programs, consider the thermocouple of temperature that the thermocouple 11 of degreasing flue measures and muffle furnace hearth
The temperature measured is to regulate and control heating schedule；7) complete after heat treatment, remove asbestos, carried out degreasing flue by riser guide empty
It is cold, boat is taken out after cooling, degreasing base is obtained.
Preferably, the carbon content of the Ultra-fine Grained WC/12Co degreasing bases is that 5.50wt.%, oxygen content are 0.40wt.%.
Advantages and positive effects of the present invention have：
1st, using the design method of independent cold seal formula flue, good airproof performance, temperature-controlled precision are high, safe and reliable, are conducive to control
Degreasing base carbon content processed, reduces the defects such as degreasing base cracking, deformation, and flue and body of heater are sealed by asbestos, simple in construction,
Cost is relatively low, operation flexibility ratio is big, can meet powder injection forming thermal debinding process demand；
2nd, the temperature-sensitive part of thermocouple is directly protruding into debinding furnace gallbladder-heat treatment region, directly measures the dynamic in degreasing flue
Temperature, can both grasp heat-treatment zone uniform temperature, be conducive to improving actual temperature-controlled precision again；
3rd, liquefied organic binder bond volatile ingredient and decomposition composition, effectively drop because of cooling can be collected by collecting fat tank
The blocking of low degreasing gas circuit, improves degreasing efficiency and safety in utilization.
Brief description of the drawings
Technical solution of the present invention is described further below in conjunction with the accompanying drawings：
Fig. 1 is a kind of front view of the cold seal formula degreasing flue of real-time temperature control of the present invention；
Fig. 2 is a kind of left view of the cold seal formula degreasing flue of real-time temperature control of the present invention；
Fig. 3 is the three-layer type stainless steel that degreasing is carried out using a kind of cold seal formula degreasing flue of real-time temperature control of the present invention
The front view of welding baffle；
Fig. 4 is the three-layer type stainless steel that degreasing is carried out using a kind of cold seal formula degreasing flue of real-time temperature control of the present invention
The left view of welding baffle；
Fig. 5 is step-like Ultra-fine Grained WC/12Co degreasings base and injection base, sintered blank size shape change comparison diagram；
Reference is as follows in figure：
1- water inlets, 2- flue lids, 3- branch pipes, 4- collection fat tanks, 5- horizontal exhaust branch pipes, the vertical exhaust branch pipes of 6-, 7- goes out
The mouth of a river, 8- cold seal water jackets, 9- flue main bodys, 10- air inlet pipe, 11- thermocouples.
Embodiment
To make the purpose, technical scheme and advantage of the invention implemented clearer, below in conjunction with the embodiment of the present invention
Accompanying drawing, the technical scheme in the embodiment of the present invention is further described in more detail.In the accompanying drawings, identical from beginning to end or class
As label represent same or similar element or the element with same or like function.Described embodiment is the present invention
A part of embodiment, rather than whole embodiments.The embodiments described below with reference to the accompanying drawings are exemplary, it is intended to uses
It is of the invention in explaining, and be not considered as limiting the invention.
Based on the embodiment in the present invention, those of ordinary skill in the art are obtained under the premise of creative work is not made
The every other embodiment obtained, belongs to the scope of protection of the invention.
Below in conjunction with the accompanying drawings, technical scheme is described in further detail by specific embodiment.
As illustrated in fig. 1 and 2, the cold seal formula degreasing flue of a kind of real-time temperature control, including flue assembly, gas handling system, exhaust
System, cold seal water jacket 8 and thermocouple 11, wherein,
The flue assembly includes flue main body 9, flue lid 2 and branch pipe 3, wherein, between flue main body 9 and flue lid 2
It is attached using bolt, uses four viton seal rings to ensure sealing, in addition, branch pipe 3 is welded on stove in the horizontal direction
In bile cover 2；
The gas handling system includes air inlet pipe 10, and its one end is arranged on outside flue assembly, other end insertion flue main body 9
It is interior, for vacuumizing and inflated with nitrogen, multiple stomatas are provided with air inlet pipe 10；
The gas extraction system includes collection fat tank 4, horizontal exhaust branch pipe 5, vertical exhaust branch pipe 6, collection fat tank 4 and horizontal exhaust
Between branch pipe 5, collect using being threadedly coupled between fat tank 4 and vertical exhaust branch pipe 6, the collection fat tank 4 is used for collection because of cooling
And liquefied organic binder bond decomposes composition, so as to reduce the blocking of degreasing gas circuit；
Valve is provided with the air inlet pipe 10, vertical exhaust branch pipe 6；
The cold seal water jacket 8 is arranged on the outside of flue main body 9, including water inlet 1, delivery port 7；
Described one end of thermocouple 11 is arranged on outside flue assembly, and the other end is temperature-sensitive part, passes through the branch on flue lid 2
In the insertion flue of pipe 3 main body 9, rubber seal is used to ensure sealing between thermocouple 11 and branch pipe 3.
The invention also discloses a kind of process that degreasing is carried out using above-mentioned degreasing flue, mainly include the following steps that：
1st, degreasing flue is positioned in muffle furnace hearth by riser guide, wherein debinding furnace gallbladder-heat treatment region is placed in stove
Thorax uniform temperature zone, cold seal part is exposed, it is noted that remaining exposed parts wraps asbestos, degreasing in addition to cold seal water jacket 8
Sealed between flue and Muffle furnace fire door using asbestos；
2nd, the step-like Ultra-fine Grained WC/12Co injection moulding bases after solvent degreasing are positioned over boat, will be such as the institutes of Fig. 3 and 4
The stainless steel welded baffle plate of three-layer type shown is positioned over the rear end of debinding furnace gallbladder-heat treatment region, then tight in degreasing flue exposed parts
By stainless steel welded baffle arrangement light-weight mullite insulating brick, and ensure to leave gas in stainless steel welded baffle plate and insulating brick periphery
Circulation road；
3rd, ON cycle cooling water so that cooling jacket 8 is in running order；
4th, before protective gas is passed through, the valve closed on vertical exhaust branch pipe 6 opens vavuum pump, passes through air inlet pipe 10
Forvacuum and pre- inflated with nitrogen；
5th, the valve in air inlet pipe 10 is opened, protective gas is passed through, after examining hydrogen purity, in vertical exhaust branch pipe
Hydrogen is lighted in 6 exits, with adjusting gas flow size；
6th, computer heating control platform is opened, is begun to warm up according to pre-set programs, in the process, considers the heat of degreasing flue
The temperature that galvanic couple 11 is measured and the temperature that the thermocouple of muffle furnace hearth is measured are to regulate and control heating schedule；
7th, complete after heat treatment, remove asbestos, degreasing flue is carried out by air cooling by riser guide, boat is taken out after cooling
Ware, obtains degreasing base.
In the present embodiment, the carbon contents of Ultra-fine Grained WC/12Co thermal debinding bases is that 5.50wt.%, oxygen content are
0.40wt.%, carbon content is slightly above theoretical carbon content, it is contemplated that there is carbon loss during follow-up vacuum-sintering, therefore the degreasing equipment
Realize the Composition Control of thermal debinding base well with technique.
As shown in figure 5, Ultra-fine Grained WC/12Co thermal debinding bases each several part shrinks, uniform, conformality is good, produced without defect,
Its full-size deviation is 1.5% or so, and dimensional accuracy is high.
It is last it is to be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations.To the greatest extent
The present invention is described in detail with reference to the foregoing embodiments for pipe, it will be understood by those within the art that：It is still
Technical scheme described in foregoing embodiments can be modified, or which part technical characteristic is equally replaced
Change；And these modifications or replacement, the essence of appropriate technical solution is departed from the essence of various embodiments of the present invention technical scheme
God and scope.
Claims (5)
1. a kind of cold seal formula degreasing flue of real-time temperature control, including flue assembly, gas handling system, gas extraction system, cold seal water jacket (8)
With thermocouple (11), it is characterised in that
The flue assembly includes flue main body (9), flue lid (2) and branch pipe (3), the flue main body (9) and the flue
It is attached, is sealed using viton seal ring, the branch pipe (3) is welded on the flue using bolt between lid (2)
Cover on (2)；
The gas handling system includes air inlet pipe (10), and one end of the air inlet pipe (10) is arranged on outside the flue assembly, separately
One end is inserted in the flue main body (9), is provided with multiple stomatas；
The gas extraction system include collection fat tank (4), horizontal exhaust branch pipe (5), vertical exhaust branch pipe (6), it is described collection fat tank (4) with
Between the horizontal exhaust branch pipe (5), it is described collection fat tank (4) with the vertical exhaust branch pipe (6) between use be threadedly coupled；
The cold seal water jacket (8) is arranged on the outside of the flue main body (9), including water inlet (1), delivery port (7)；
Described thermocouple (11) one end is arranged on outside the flue assembly, and the other end is temperature-sensitive part, passes through the flue lid
(2) branch pipe (3) on is inserted in the flue main body (9), close using rubber between the thermocouple (11) and the branch pipe (3)
Envelope.
2. degreasing flue according to claim 1, it is characterised in that the collection fat tank (4) is used to collect organic binder bond
Volatile ingredient and decomposition composition.
3. degreasing flue according to claim 1, it is characterised in that on the air inlet pipe (10), vertical exhaust branch pipe (6)
It is provided with valve.
4. the degreasing method that a kind of degreasing flue of use according to any one of claim 1-3 claim is carried out, it is special
Levy and be, the degreasing method comprises the following steps,
1) degreasing flue is positioned in muffle furnace hearth by riser guide, wherein to be placed in burner hearth equal for debinding furnace gallbladder-heat treatment region
Warm area, cold seal part is exposed, in addition to cold seal water jacket (8), and remaining exposed parts wraps asbestos, degreasing flue and Muffle furnace stove
Sealed between mouthful using asbestos；
2) the step-like Ultra-fine Grained WC/12Co injection moulding bases after solvent degreasing are positioned over boat, three-layer type stainless steel is welded
The rear end that baffle plate is positioned over debinding furnace gallbladder-heat treatment region is connect, is protected in degreasing flue exposed parts against stainless steel welded baffle arrangement
Warm brick, gas channel is left in stainless steel welded baffle plate and insulating brick periphery；
3) ON cycle cooling water so that cooling jacket (8) is in running order；
4) before protective gas is passed through, the valve closed on vertical exhaust branch pipe (6) is opened vavuum pump, passed through air inlet pipe (10)
Forvacuum and pre- inflated with nitrogen；
5) valve in air inlet pipe (10) is opened, protective gas is passed through, after examining hydrogen purity, in vertical exhaust branch pipe
(6) hydrogen, and adjusting gas flow size are lighted in exit；
6) computer heating control platform is opened, is begun to warm up according to pre-set programs, considers what the thermocouple (11) of degreasing flue was measured
The temperature that the thermocouple of temperature and muffle furnace hearth is measured is to regulate and control heating schedule；
7) complete after heat treatment, remove asbestos, degreasing flue is carried out by air cooling by riser guide, boat is taken out after cooling, obtains
Obtain degreasing base.
5. degreasing method according to claim 4, it is characterised in that the carbon content of the Ultra-fine Grained WC/12Co degreasing bases
It is 0.40wt.% for 5.50wt.%, oxygen content.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710448868.1A CN107243632B (en) | 2017-06-14 | 2017-06-14 | A kind of the cold seal formula degreasing flue and degreasing method of real-time temperature control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710448868.1A CN107243632B (en) | 2017-06-14 | 2017-06-14 | A kind of the cold seal formula degreasing flue and degreasing method of real-time temperature control |
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| Publication Number | Publication Date |
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| CN107243632A true CN107243632A (en) | 2017-10-13 |
| CN107243632B CN107243632B (en) | 2019-03-22 |
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| CN201710448868.1A Active CN107243632B (en) | 2017-06-14 | 2017-06-14 | A kind of the cold seal formula degreasing flue and degreasing method of real-time temperature control |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109108281A (en) * | 2018-08-21 | 2019-01-01 | 三峡大学 | Air passage structure in a kind of hard alloy and cermet debinding furnace burner hearth |
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| CN106825580A (en) * | 2017-02-23 | 2017-06-13 | 深圳市星特烁科技有限公司 | A kind of catalysis degreasing stove with atmosphere purification function |
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| CN2257594Y (en) * | 1995-10-13 | 1997-07-09 | 马俊源 | Energy-saving boiler with heating and cooking function |
| JP4265127B2 (en) * | 2000-12-12 | 2009-05-20 | 三菱マテリアル株式会社 | Silver powder for silver clay excellent in low temperature sintering property and silver clay containing this silver powder |
| CN2597927Y (en) * | 2003-01-24 | 2004-01-07 | 湖南英捷高科技有限责任公司 | Vacuum defatting device |
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| CN109108281A (en) * | 2018-08-21 | 2019-01-01 | 三峡大学 | Air passage structure in a kind of hard alloy and cermet debinding furnace burner hearth |
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| CN107243632B (en) | 2019-03-22 |
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Effective date of registration: 20191114 Address after: 101407 Beijing city Huairou District Yanqi Economic Development Zone Branch Hing Street No. 11 Patentee after: Research Institute of engineering and Technology Co., Ltd. Address before: 100088 Beijing city Xicheng District Xinjiekou Avenue No. 2 Patentee before: General Research Institute for Nonferrous Metals |