CN114799168A - Preparation method for metal injection molding of SMT carrier plate jig - Google Patents

Preparation method for metal injection molding of SMT carrier plate jig Download PDF

Info

Publication number
CN114799168A
CN114799168A CN202210569092.XA CN202210569092A CN114799168A CN 114799168 A CN114799168 A CN 114799168A CN 202210569092 A CN202210569092 A CN 202210569092A CN 114799168 A CN114799168 A CN 114799168A
Authority
CN
China
Prior art keywords
jig
sintering
injection molding
blank
carrier plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202210569092.XA
Other languages
Chinese (zh)
Other versions
CN114799168B (en
Inventor
杜朝晖
杨勇
吕光辉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Anhui Haofang Electromechanics Co Ltd
Original Assignee
Anhui Haofang Electromechanics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Anhui Haofang Electromechanics Co Ltd filed Critical Anhui Haofang Electromechanics Co Ltd
Priority to CN202210569092.XA priority Critical patent/CN114799168B/en
Publication of CN114799168A publication Critical patent/CN114799168A/en
Application granted granted Critical
Publication of CN114799168B publication Critical patent/CN114799168B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • B22F3/02—Compacting only
    • B22F3/03—Press-moulding apparatus therefor
    • 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
    • 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
    • B22F3/1003—Use of special medium during sintering, e.g. sintering aid
    • B22F3/1007—Atmosphere
    • 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
    • B22F3/12—Both compacting and sintering
    • B22F3/16—Both compacting and sintering in successive or repeated steps
    • B22F3/164—Partial deformation or calibration
    • 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
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • 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
    • B22F3/12—Both compacting and sintering
    • B22F3/16—Both compacting and sintering in successive or repeated steps
    • B22F3/164—Partial deformation or calibration
    • B22F2003/166—Surface calibration, blasting, burnishing, sizing, coining
    • 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
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • B22F2009/0824—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with a specific atomising fluid
    • 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
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • B22F2009/0824—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with a specific atomising fluid
    • B22F2009/0828—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with a specific atomising fluid with water

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)

Abstract

The invention provides a preparation method of metal injection molding of an SMT carrier plate jig, which is characterized by comprising the following steps of: the method comprises the following steps of preparing metal powder; blending a binder; preparing a feed; injection molding; trimming; degreasing; sintering; shaping; straightening; double-sided grinding; CNC1 processing; CNC2 processing; performing rolling and polishing; cleaning; and (6) carrying out full size inspection. The invention realizes the production of products which have good planeness, no cracking, good service performance and the like and meet the requirements of customers by optimizing the parameters of raw material selection, preparation, mold design, degreasing, sintering process and the like, and improves the production efficiency and reduces the cost by combining the metal injection molding process (MIM) and CNC finish machining.

Description

Preparation method for metal injection molding of SMT carrier plate jig
Technical Field
The invention relates to the technical field of metal powder injection molding, in particular to a manufacturing method of an SMT carrier plate jig for metal powder injection molding.
Background
In the SMT processing industry, a carrier plate jig cannot be separated during the process of welding the PCB and the electronic element, and in order to meet the requirements of product size consistency and high precision and improve production efficiency, the carrier plate jig has very high requirements. The SMT support plate tool adopts monoblock steel material at present, by punch press processing, and thermal treatment, then the finish machining's of CNC mode preparation forms. High cost and low efficiency. The processing technology which can meet the precision requirement, improve the production efficiency and reduce the cost is urgently needed.
As a near-net forming process, the metal injection forming process can meet the requirement of forming a product at one time to a greater extent, and the obtained product can meet the requirement of customers only by a small amount of machining, so that the raw materials and the production cost can be greatly saved. The injection molding process still has certain technical problems, such as deformation, cracking, uneven size shrinkage and the like, for producing products with overlarge external dimension and excessively thin thickness.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a preparation method for metal injection molding of an SMT carrier plate jig.
The application provides the following technical scheme:
1. a preparation method for metal injection molding of an SMT carrier plate jig is characterized in that: the method comprises the following steps: preparing metal powder: selecting SUS301 alloy powder, wherein the gas/water atomization SUS301 alloy powder is prepared by the following steps of: 6, 5:5 or 6:4, and mixing uniformly for later use;
and (3) blending of a binder: the adhesive comprises: the main components of the adhesive are adhesive, framework adhesive and lubricant;
preparing a feed: heating the mixed SUS301 alloy powder in an internal mixer at the rotating speed of 15 r/min, adding the prepared binder to begin internal mixing after the temperature reaches 185 ℃, adjusting the rotating speed of the internal mixer to 30 r/min, melting the binder to form mud after internal mixing for 6 min, turning off the heating function of the internal mixer, and continuing internal mixing for 30 min;
injection molding: setting the temperature of a nozzle of an injection machine to be 200 ℃ and the temperature of a mould to be 120 ℃, adding the feed into the injection machine and injecting the feed into the mould to form an injection blank of the carrier plate jig;
trimming: removing burrs of the injection blank by adopting a manual deburring or sand blasting mode, wherein sand used for sand blasting is brown corundum sand;
degreasing: degreasing the trimmed injection embryo in a degreasing furnace by adopting concentrated nitric acid with the concentration of 98% or oxalic acid with the purity of 99.8%, wherein the degreasing temperature is 110-130 ℃, and the degreasing time is 14-16 hours;
and (3) sintering: placing the degreased product into a sintering furnace for sintering, wherein the sintering temperature is 1360-1380 ℃, and the maximum temperature is kept for 2-3 hours to obtain a sintered blank;
and (3) detection: placing the sintered blank on a marble platform, and detecting the deformation condition by using a plug gauge;
shaping: carrying out adaptive adjustment on a carrier plate shaping tool according to the detection data, then placing the carrier plate shaping tool on a workbench of a 200T oil press, placing a sintering blank in the shaping tool, starting the 200T oil press and shaping a carrier plate jig through the shaping tool; the flatness of the upper surface 1 and the lower surface 2 of the carrier plate jig is ensured by shaping, the flatness is 0.05-0.1mm, and 9 points of the flatness are taken for testing;
straightening: comprehensively straightening the shaped carrier plate jig sintering blank by using a straightening machine, wherein the flatness and the parallelism after straightening are 0.05-0.1 mm;
double-side grinding: carrying out double-sided flat grinding treatment on the upper surface and the lower surface of the straightened support plate jig to obtain a ground blank;
CNC1 machining: positioning by taking the length side of the ground blank as an X reference, positioning by taking the width side as a Y reference, and performing finish machining on all holes on the ground blank to ensure the dimensional accuracy to be +/-0.01 mm;
CNC2 machining: fixing a product processed by CNC1 on a special jig for processing, positioning by taking three positioning holes on a ground blank as an X/Y reference, and positioning by taking the surface of the ground blank as a Z reference, finishing the finish machining of the appearance and the internal cavity of the ground blank of the carrier plate jig, and ensuring the dimensional precision to be +/-0.03 mm;
rolling and throwing: and E, removing burrs of the appearance and the inner cavity of the product which is subjected to the step M in a rolling and polishing mode.
Cleaning: automatically cleaning the rolled and polished product by using ultrasonic waves to remove surface dirt;
and (4) full size inspection: and (4) carrying out three-dimensional full inspection on the cleaned product to obtain a final finished product of the support plate jig.
Support plate plastic frock includes:
it is including corresponding complex last mould and lower mould, goes up the mould including corresponding cooperation cope match-plate pattern fixed plate and cope match-plate pattern, and the lower mould is equipped with a set of guide pillar including corresponding cooperation lower bolster fixed plate and lower module at the cope match-plate pattern fixed plate, is equipped with a set of guide pillar on the lower bolster fixed plate and corresponds complex guide pin bushing, its characterized in that with the guide pillar on a set of guide pillar: an upper mold insert mounting hole is formed in the upper mold plate, a lower mold insert mounting hole is formed in the lower mold block, a group of upper mold inserts are distributed in the upper mold insert mounting hole, a group of lower mold inserts are distributed in the lower mold insert mounting hole, a first limiting assembly correspondingly matched with the upper mold inserts is arranged on the upper mold, and a second limiting assembly correspondingly matched with the lower mold inserts is arranged on the lower mold; the upper insert mounting hole and the lower insert mounting hole are stepped holes, one ends of the upper insert and the lower insert extend out of extension blocks correspondingly matched with the steps, and the thickness of the extension blocks is smaller than the depth of the upper steps of the upper insert mounting hole and the lower insert mounting hole; the first limiting assembly comprises a machine rice screw with one end correspondingly matched with the upper insert, which penetrates through the upper template fixing plate, and fastening bolts correspondingly matched with the upper insert are respectively arranged on two sides of the upper template; the second limiting assembly comprises a group of second machine screws which are arranged on the lower template fixing plate in a penetrating mode and form jacking fit with the lower insert, and a group of second fastening bolts which are correspondingly matched with the lower insert are arranged on the left side and the right side of the lower template respectively.
On the basis of the technical scheme, the following further technical scheme can be provided:
the SUS301 alloy powder comprises the following elements in percentage by mass: 0.1 to 0.15 percent of C, 16.0 to 18.0 percent of Cr16, 6.0 to 8.0 percent of Ni0, 0.52 to 1.0 percent of Si, 0.47 to 2.0 percent of Mn0.0005 to 0.3 percent of S, 0.025 to 0.045 percent of P, 0 to 0.07 percent of oxygen content PPM and the balance of Fe.
The particle size distribution of the SUS301 alloy powder is D10: 2.0-5.0 μm, D50: 8.0-10.0 μm, D90: 20.0-25.00 mu m.
The main binder component is polyformaldehyde; the skeleton binder is high-density polyethylene; the lubricant comprises polyethylene wax, paraffin and stearic acid, wherein the proportion of the polyformaldehyde to the high-density polyethylene to the ethylene wax to the paraffin to the stearic acid is 8: 1: 0.5: 1: 0.5.
when the sintering temperature rises to 1360 ℃ in the step sintering, vacuum sintering is used, and the vacuum degree in the furnace is controlled to reach 10 -1 pa, and keeping the temperature for 3 hours; and in the process of cooling after sintering, setting the cooling time between 800 ℃ and 500 ℃ to be 3 hours.
And in the process of cooling after sintering, keeping the vacuum state for 1h, and then introducing argon to cool.
A die preparation step is also provided before the step of preparing the metal powder: according to a product drawing file, adding a margin with the thickness of 0.2mm to the edge without the chamfer angle, all chamfer angles C0.2-C0.5 and the glue position thickness below 1.0mm in the mould, and grinding the margin when the double-side grinding step is carried out.
An SMT carrier plate jig for metal injection molding comprises a plate body, wherein a group of connector mounting holes, at least one group of magnet mounting holes and a plurality of positioning holes are uniformly distributed in the plate body.
The invention has the advantages that:
the invention realizes the production of products which have good planeness, no cracking, good service performance and the like and meet the requirements of customers by optimizing the parameters of raw material selection, preparation, mold design, degreasing, sintering process and the like, and improves the production efficiency and reduces the cost by combining the metal injection molding process (MIM) and CNC finish machining.
In particular:
1. the invention uses the gas atomized powder with good fluidity but poor shape retention to be used together with the water atomized powder with poor fluidity but good shape retention, so that the good fluidity of the metal powder in the injection process is ensured when preparing the ultra-large and ultra-thin MIM product, thereby being more beneficial to filling the die cavity of the die and reducing the internal pores of the product; in addition, more than 90% of the binder volatilizes after the acid degreasing is finished, so that the strength of the green body is extremely low, and the strength of the degreased green body can be enhanced due to the water atomized powder with better shape retention, so that the phenomenon of green body collapse or deformation is avoided.
2. Because the product is larger and thinner, the thickness of part of models of products is less than 0.8mm, and the invention is more beneficial to filling a mold cavity during injection, the invention designs a plastic-based (polyformaldehyde) + wax-based (paraffin) binder system, the system is mainly based on plastic-based components, paraffin has better fluidity, the addition of paraffin can obviously improve the fluidity of feed, the fluidity data MFR is improved from 935g/10min of plastic base material to 1440g/10min of plastic-based + wax base material, and the binder system can obviously reduce the problem of incomplete injection blank.
3. The invention uses vacuum sintering when the sintering temperature is raised to 1360 ℃, the sintering neck is formed between the metal powders at the temperature, the interatomic combination is formed between the powders through the sintering neck, and the vacuum sintering is adopted in the process, which is more beneficial to the discharge of gas.
4. The added shaping process effectively reduces the deformation amount, and further lightens the deformation of the final product.
5. The product produced by the process of the invention has more obvious benefits than the traditional process, and the comparative data are as follows:
drawings
Fig. 1 is a schematic structural diagram of a finished carrier jig;
fig. 2 is a structural diagram of a carrier shaping tool.
Detailed Description
Example 1:
a preparation method for metal injection molding of an SMT carrier plate jig is characterized by comprising the following steps: the method comprises the following steps:
1) a step of preparing a mould: according to the product drawing file, the edges without chamfers in the die are chamfered by C0.2-C0.5, and then the margin of 0.2mm thickness is added at the position where the glue position thickness in the die is less than 1.0 mm. Therefore, the bending phenomenon caused by small local thickness of the injected embryo can be effectively avoided.
2) Preparing metal powder: selecting SUS301 alloy powder, wherein the gas atomized SUS301 alloy powder and the water atomized SUS301 alloy powder are uniformly mixed according to the mass fraction of 5:5 for later use. The elements contained in the gas and water atomized SUS301 alloy powder are the same and comprise the following components in percentage by mass: 0.1% of C, 18.0% of Cr18.0%, 6.0% of Ni0%, 1.0% of Si, 0.47% of Mn0.3%, 0.025% of P, 0.03% of oxygen content PPM and the balance of Fe. The grain size distribution of these alloy powders was D10: 2.8 μm, D50: 8.49 μm, D90: 21.8 μm.
3) And (3) blending of a binder: the adhesive comprises polyformaldehyde (plastic base) as a main adhesive, high-density polyethylene as a framework adhesive, polyethylene wax as a lubricant, paraffin and stearic acid, wherein the ratio of each component is 8: 1: 0.5: 1: 0.5.
4) preparing a feed: and (2) heating the mixed SUS301 alloy powder in an internal mixer at the rotating speed of 15 r/min, adding the prepared binder to begin internal mixing after the temperature reaches 185 ℃, adjusting the rotating speed of the internal mixer to 30 r/min, melting the binder to form mud after internal mixing for 6 min, turning off the heating function of the internal mixer, and continuing internal mixing for 30 min. The weight ratio of the SUS301 alloy powder to the binder is that the SUS301 alloy powder accounts for 90% and the binder accounts for 10%.
5) Injection molding: setting the temperature of a nozzle of the injection machine to be 200 ℃ and the temperature of the mould to be 120 ℃, adding the feed into the injection machine and injecting the feed into the mould to form an injection blank of the carrier plate jig.
6) Trimming: and taking the injection blank out of the injection machine, and removing burrs of the injection blank by adopting a manual deburring or sand blasting mode, wherein the sand used for sand blasting is brown corundum sand.
7) Degreasing: and degreasing the trimmed injection blank in a degreasing furnace by adopting concentrated nitric acid with the concentration of 98% or oxalic acid with the purity of 99.8%, wherein the degreasing temperature is 120 ℃, the degreasing time is 14-16 hours, and the injection blank is conveyed into a sintering furnace.
8) And (3) sintering: when the sintering temperature rises to 1360 ℃, vacuum sintering is used, and the vacuum degree in the furnace is controlled to reach 10 -1 pa, and keeping the temperature for 3 hours; and in the process of cooling after sintering, keeping the vacuum state for 1h, introducing argon to cool, cooling the temperature from 800 ℃ to 500 ℃ for 3 hours, naturally cooling the temperature to below 80 ℃, opening a sintering furnace, and taking out the sintered blank at room temperature to obtain a sintered blank.
9) And (3) detection: placing the sintered blank on a marble platform, and detecting the deformation condition by using a plug gauge;
10) shaping: carrying out adaptive adjustment on a support plate shaping tool according to deformation data detected by a plug gauge, then placing the support plate shaping tool on a workbench of an oil press, placing a sintering blank in the shaping tool, starting the oil press and shaping a support plate jig through the shaping tool; the flatness of the upper surface 1 and the lower surface 2 of the support plate jig and the flatness of 0.05-0.1mm are ensured through shaping, and 9 points of the flatness are taken for testing;
12) straightening: comprehensively straightening the shaped carrier plate jig sintering blank by using a straightening machine, wherein the flatness and the parallelism after straightening are 0.05-0.1 mm;
12) double-side grinding: and carrying out double-sided flat grinding treatment on the upper surface and the lower surface of the straightened carrier plate jig to obtain a ground blank. The thickness margin added in the die preparation step can be eliminated in this step.
13) CNC1 machining: positioning by taking the length side of the ground blank as an X reference, positioning by taking the width side as a Y reference, and performing finish machining on all holes on the ground blank to ensure the dimensional accuracy to be +/-0.01 mm;
14) CNC2 machining: fixing a product processed by CNC1 on a special jig for processing, positioning by taking three positioning holes on a ground blank as an X/Y reference, and positioning by taking the surface of the ground blank as a Z reference, finishing the finish machining of the appearance and the internal cavity of the ground blank of the carrier plate jig, and ensuring the dimensional accuracy to be +/-0.03 mm;
15) rolling and throwing: and E, removing burrs of the appearance and the inner cavity of the product which is subjected to the step M in a rolling and polishing mode.
16) Cleaning: automatically cleaning the rolled and polished product by using ultrasonic waves to remove surface dirt;
17) and (4) full size inspection: and (4) carrying out three-dimensional full inspection on the cleaned product to obtain a final finished product of the support plate jig.
As shown in fig. 2, the carrier plate shaping tool comprises an upper die and a lower die which are matched correspondingly, the upper die comprises an upper die plate fixing plate 1 and an upper die plate 2 which can be connected together through screws, the lower die comprises a lower die plate fixing plate 3 and a lower die plate 4 which can be connected together through screws, the upper die plate fixing plate 1 is connected with a group of guide pillars 5, and a group of guide sleeves 6 which are matched with the guide pillars 5 correspondingly are mounted on the lower die plate fixing plate 3.
The upper die plate 2 is provided with upper insert mounting holes 2a, and the lower die plate 4 is provided with lower insert mounting holes 4a distributed corresponding to the upper insert mounting holes 2 a. The upper insert mounting hole 2a and the lower insert mounting hole 4a are stepped holes, and the steps are positioned at one end close to the upper/lower template fixing plate.
Three upper inserts 2b and three lower inserts 4b are respectively and correspondingly arranged in the upper insert mounting hole 2a and the lower insert mounting hole 4a, and the top of one lower insert 4b is an upward-bulged cambered surface (not shown in the figure). Extending blocks 13 correspondingly matched with the steps extend from one ends of the upper insert 2b and the lower insert 4b, and the thickness of each extending block 13 is smaller than the depth of the upper step of the upper insert mounting hole 2a and the lower insert mounting hole 4 a. So that the upper insert 2b and the lower insert 4b have an adjustment stroke moving in the longitudinal direction within the corresponding upper insert mounting hole 2a and the lower insert mounting hole 4 a.
After the upper insert 2b and the lower insert 4b are respectively placed in the upper insert mounting hole 2a and the lower insert mounting hole 4a, the upper template fixing plate 1 and the upper template 2, and the lower template fixing plate 3 and the lower template 4 are fixedly connected together by bolts.
And a first limiting assembly correspondingly matched with the upper insert 2b is arranged on the upper die, and a second limiting assembly correspondingly matched with the lower insert 4b is arranged on the lower die. The first limiting assembly comprises three machine-meter screws 7 which penetrate through the upper template fixing plate 1, each machine-meter screw 7 corresponds to the bottom of the corresponding upper insert 2b, the upper insert 2b can be placed through pushing and adjusting the upper insert 2b by rotating the machine-meter screws 7, and therefore the length of the upper insert extending out of the insert mounting hole is adjusted. A group of fastening bolts 8 correspondingly matched with the upper insert 2b are respectively arranged at the left side and the right side of the upper template 2. The upper insert 2b is locked from both left and right sides by fastening bolts 8. The second limiting assembly and the first limiting assembly are mounted at the same structure and different positions and play the same role basically, the second limiting assembly also comprises a group of second machine screws 9 which are mounted on the lower template fixing plate 3 and form a jacking fit with the lower insert 4b, and a group of second fastening bolts 10 which are correspondingly matched with the lower insert 4b are respectively arranged on the left side and the right side of the lower template 4. And therefore will not be described in detail herein.
Two limiting cushion blocks 11 are arranged on the upper surface of the lower template 4 at the outer side of the lower insert mounting hole 4 a. One limiting cushion block 11 is distributed along the length direction of the lower template 4, and the other limiting cushion block 11 is distributed along the width direction of the lower template 4. The stroke of the upper die moving downwards is limited through the limiting cushion block 11, and the sintering blank 12 is prevented from being crushed.
Example 2:
examples 2 and 1 differ in that: the elements contained in the SUS301 alloy powder are the same and comprise the following components in percentage by mass: 0.15% of C, 16.0% of Cr16.0%, 8.0% of Ni0%, 0.52% of Si, 2.0% of Mn, 0.0005% of S, 0.025% of P, 0% of oxygen content PPM and the balance of Fe. The grain size distribution of these alloy powders was D10: 2.0 μm, D50: 9.5 μm, D90: 21.0 μm. The degreasing temperature is 127 ℃, and the degreasing time is 15 hours.
Example 3:
examples 3 and 1 differ in that: the elements contained in the SUS301 alloy powder are the same and comprise the following components in percentage by mass: 0.11% of C, 17.0% of Cr17.0% of Ni7.0%, 0.62% of Si, 0.5% of Mn, 0.001% of S, 0.035% of P, 0.03% of oxygen content PPM and the balance of Fe. The grain size distribution of these alloy powders was D10: 2.0 μm, D50: 9.5 μm, D90: 20.0 μm. The degreasing temperature is 113 ℃, and the degreasing time is 16 hours.
As shown in fig. 1, an SMT carrier board jig 12 produced by using the embodiments 1-3 includes a board body 12a, a group of connector mounting holes 12b distributed in an array shape and a group of magnet mounting holes 12c are uniformly distributed on the board body 12a, wherein a part of the magnet mounting holes 12c are distributed in the array of the connector mounting holes 12b, another part of the magnet mounting holes 12c are distributed along the length and width of the board body 1, and a plurality of positioning holes 12d with different positions are distributed on the board body 12a outside the array of the connector mounting holes 12 b.

Claims (9)

1. A preparation method for metal injection molding of an SMT carrier plate jig is characterized by comprising the following steps: the method comprises the following steps: preparing metal powder: selecting SUS301 alloy powder, wherein the gas/water atomization SUS301 alloy powder is prepared by the following steps of: 6, 5:5 or 6:4, and mixing uniformly for later use;
and (3) blending of a binder: the adhesive comprises: the main components of the adhesive are adhesive, framework adhesive and lubricant;
preparing a feed: heating the mixed SUS301 alloy powder in an internal mixer at the rotation speed of 15 r/min, adding the prepared binder to begin internal mixing after the temperature reaches 185 ℃, simultaneously adjusting the rotation speed of the internal mixer to 30 r/min, melting the binder into mud after internal mixing for 6 min, turning off the heating function of the internal mixer, and continuing internal mixing for 30 min;
injection molding: setting the temperature of a nozzle of an injection machine to be 200 ℃ and the temperature of a mould to be 120 ℃, adding the feed into the injection machine and injecting the feed into the mould to form an injection blank of the carrier plate jig;
trimming: removing burrs of the injection blank by adopting a manual deburring or sand blasting mode, wherein sand used for sand blasting is brown corundum sand;
degreasing: degreasing the trimmed injection embryo in a degreasing furnace by adopting concentrated nitric acid with the concentration of 98% or oxalic acid with the purity of 99.8%, wherein the degreasing temperature is 110-;
and (3) sintering: placing the degreased product into a sintering furnace for sintering, wherein the sintering temperature is 1360-1380 ℃, and the maximum temperature is kept for 2-3 hours to obtain a sintered blank;
and (3) detection: placing the sintered blank on a marble platform, and detecting the deformation condition by using a plug gauge;
shaping: carrying out adaptive adjustment on a carrier plate shaping tool according to the detection data, then placing the carrier plate shaping tool on a workbench of an oil press, placing a sintering blank in the shaping tool, starting the oil press and shaping a carrier plate jig through the shaping tool; the flatness of the upper surface 1 and the lower surface 2 of the carrier plate jig is ensured by shaping, the flatness is 0.05-0.1mm, and 9 point positions are taken for testing the flatness;
straightening: comprehensively straightening the shaped carrier plate jig sintering blank by using a straightening machine, wherein the flatness and the parallelism after straightening are 0.05-0.1 mm;
double-side grinding: carrying out double-side flat grinding treatment on the upper surface and the lower surface of the straightened carrier plate jig to obtain a ground blank;
CNC1 machining: positioning by taking the length side of the ground blank as an X reference, positioning by taking the width side as a Y reference, and performing finish machining on all holes on the ground blank to ensure the dimensional accuracy to be +/-0.01 mm;
CNC2 machining: fixing a product processed by CNC1 on a special jig for processing, positioning by taking three positioning holes on a ground blank as an X/Y reference, and positioning by taking the surface of the ground blank as a Z reference, finishing the finish machining of the appearance and the internal cavity of the ground blank of the carrier plate jig, and ensuring the dimensional precision to be +/-0.03 mm;
rolling and throwing: removing burrs on the appearance and the inner cavity of the product after the step M is finished in a rolling and polishing mode;
cleaning: automatically cleaning the rolled and polished product by using ultrasonic waves to remove surface dirt;
and (4) full size inspection: carrying out three-dimensional full inspection on the cleaned product to obtain a final finished product of the support plate jig;
support plate plastic frock includes:
it is including corresponding complex last mould and lower mould, goes up the mould including corresponding cooperation cope match-plate pattern fixed plate (1) and cope match-plate pattern (2), and the lower mould is including corresponding cooperation lower bolster fixed plate (3) and lower module (4), is equipped with a set of guide pillar (5) at cope match-plate pattern fixed plate (1), is equipped with a set of guide pin bushing (6) that correspond complex with guide pillar (5) on lower bolster fixed plate (3), its characterized in that: an upper insert mounting hole (2 a) is formed in the upper template (2), a lower insert mounting hole (4 a) is formed in the lower module (4), a group of upper inserts (2 b) are distributed in the upper insert mounting hole (2 a), a group of lower inserts (4 b) are distributed in the lower insert mounting hole (4 a), a first limiting assembly correspondingly matched with the upper inserts (2 b) is arranged on the upper template, and a second limiting assembly correspondingly matched with the lower inserts (4 b) is arranged on the lower template; the upper insert mounting hole (2 a) and the lower insert mounting hole (4 b) are stepped holes, one end of each of the upper insert (2 b) and the lower insert (4 a) extends out of an extension block (6) correspondingly matched with the step, and the thickness of each extension block (6) is smaller than the depth of the upper step of each of the upper insert mounting hole (2 a) and the lower insert mounting hole (4 a); the first limiting assembly comprises a machine rice screw (7) with one end correspondingly matched with the upper insert (2 b) and arranged on the upper template fixing plate (1) in a penetrating manner, and fastening bolts (8) correspondingly matched with the upper insert (2 b) are respectively arranged on two sides of the upper template (2); the second limiting assembly comprises a second machine screw (9) which is arranged on the lower template fixing plate (3) in a penetrating mode and forms a jacking fit with the lower insert (4 b), and a group of second fastening bolts (10) which are correspondingly matched with the lower insert (4 b) are arranged on the left side and the right side of the lower template (4) respectively.
2. The method of claim 1, wherein the SMT carrier jig is prepared by metal injection molding, and the method comprises the steps of: the SUS301 alloy powder comprises the following elements in percentage by mass: 0.1 to 0.15 percent of C, 16.0 to 18.0 percent of Cr16, 6.0 to 8.0 percent of Ni0, 0.52 to 1.0 percent of Si, 0.47 to 2.0 percent of Mn0.0005 to 0.3 percent of S, 0.025 to 0.045 percent of P, 0 to 0.07 percent of oxygen content PPM and the balance of Fe.
3. The method of claim 2, wherein the SMT carrier jig is prepared by metal injection molding, and the method comprises the steps of: the particle size distribution of the SUS301 alloy powder is D10: 2.0-5.0 μm, D50: 8.0-10.0 μm, D90: 20.0-25.00 mu m.
4. The method of claim 1, wherein the SMT carrier jig is prepared by metal injection molding, and the method comprises the steps of: the main binder component is polyformaldehyde; the skeleton binder is high-density polyethylene; the lubricant comprises polyethylene wax, paraffin and stearic acid, and the proportion of the polyethylene wax to the paraffin to the stearic acid is 8: 1: 0.5: 1: 0.5.
5. the method of claim 1, wherein the SMT carrier jig is prepared by metal injection molding, and the method comprises the steps of: when the sintering temperature is raised to 1360 ℃ in the sintering step, vacuum sintering is used, and the vacuum degree in the furnace is controlled to reach 10 -1 pa, and keeping the temperature for 3 hours; and in the process of cooling after sintering, setting the cooling time between 800 ℃ and 500 ℃ to be 3 hours.
6. The method of claim 5, wherein the method comprises the following steps: and in the process of cooling after sintering, keeping the vacuum state for 1h, and then introducing argon to cool.
7. The method of claim 1, wherein the SMT carrier jig is prepared by metal injection molding, and the method comprises the steps of: a step of preparing the mould is also arranged before the step 1): according to a product drawing file, adding a margin with the thickness of 0.2mm to the edge without the chamfer angle, all chamfer angles C0.2-C0.5 and the glue position thickness below 1.0mm in the mould, and grinding the margin when the double-side grinding step is carried out.
8. The method of claim 1, wherein the SMT carrier jig is prepared by metal injection molding, and the method comprises the steps of: in the step of preparing metal powder, the gas/water atomization of the mixed powder of SUS301 alloy powder is performed by gas atomization and water atomization according to a mass fraction of 4: 6, 5:5 or 6:4, and mixing uniformly for use.
9. An SMT carrier plate jig for metal injection molding comprises a plate body (12 a), wherein a group of connector mounting holes (12 b), a group of magnet mounting holes (12 c) and a plurality of positioning holes (12 d) are uniformly distributed in the plate body (12 a).
CN202210569092.XA 2022-05-24 2022-05-24 Preparation method for SMT carrier plate jig metal injection molding Active CN114799168B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210569092.XA CN114799168B (en) 2022-05-24 2022-05-24 Preparation method for SMT carrier plate jig metal injection molding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210569092.XA CN114799168B (en) 2022-05-24 2022-05-24 Preparation method for SMT carrier plate jig metal injection molding

Publications (2)

Publication Number Publication Date
CN114799168A true CN114799168A (en) 2022-07-29
CN114799168B CN114799168B (en) 2023-04-25

Family

ID=82518202

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210569092.XA Active CN114799168B (en) 2022-05-24 2022-05-24 Preparation method for SMT carrier plate jig metal injection molding

Country Status (1)

Country Link
CN (1) CN114799168B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115383113A (en) * 2022-09-13 2022-11-25 中铁隆昌铁路器材有限公司 Pressureless sintering tool and sintering method for friction body assembly of powder metallurgy brake pad
CN118143085A (en) * 2024-05-11 2024-06-07 广州众山紧固件有限公司 Flatness shaping device and shaping method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003193108A (en) * 2002-12-09 2003-07-09 Seiko Epson Corp Method for manufacturing metallic sintered compact
CN105838958A (en) * 2016-05-16 2016-08-10 东莞理工学院 Preparation method of hard alloy round bar
CN206392856U (en) * 2016-11-25 2017-08-11 苏州中宝复合材料股份有限公司 Punching press apparatus for shaping
CN112427641A (en) * 2020-12-03 2021-03-02 安徽昊方机电股份有限公司 Preparation method of mobile phone middle plate jig
CN214977748U (en) * 2021-05-12 2021-12-03 安徽昊方机电股份有限公司 Ejecting structure of metal injection molding die

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003193108A (en) * 2002-12-09 2003-07-09 Seiko Epson Corp Method for manufacturing metallic sintered compact
CN105838958A (en) * 2016-05-16 2016-08-10 东莞理工学院 Preparation method of hard alloy round bar
CN206392856U (en) * 2016-11-25 2017-08-11 苏州中宝复合材料股份有限公司 Punching press apparatus for shaping
CN112427641A (en) * 2020-12-03 2021-03-02 安徽昊方机电股份有限公司 Preparation method of mobile phone middle plate jig
CN214977748U (en) * 2021-05-12 2021-12-03 安徽昊方机电股份有限公司 Ejecting structure of metal injection molding die

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115383113A (en) * 2022-09-13 2022-11-25 中铁隆昌铁路器材有限公司 Pressureless sintering tool and sintering method for friction body assembly of powder metallurgy brake pad
CN115383113B (en) * 2022-09-13 2023-08-25 中铁隆昌铁路器材有限公司 Pressureless sintering tool and sintering method for powder metallurgy brake pad friction body assembly
CN118143085A (en) * 2024-05-11 2024-06-07 广州众山紧固件有限公司 Flatness shaping device and shaping method
CN118143085B (en) * 2024-05-11 2024-07-26 广州众山紧固件有限公司 Flatness shaping device and shaping method

Also Published As

Publication number Publication date
CN114799168B (en) 2023-04-25

Similar Documents

Publication Publication Date Title
CN114799168B (en) Preparation method for SMT carrier plate jig metal injection molding
CN106956224B (en) A kind of skive stick and preparation method thereof
CN100493764C (en) Large specification roller hot forging process
CN103007502A (en) Manufacturing method for striking panel of golf club head
CN110918844A (en) Thin-wall multi-ring high-rib component space envelope forming method
CN112427641A (en) Preparation method of mobile phone middle plate jig
CN203266448U (en) Sintering diamond abrasive wheel
JP3215368B2 (en) Method of manufacturing indexable tip and indexable tip
CN113084718B (en) Forming and sintering process of metal bond diamond grinding head
CN107795664A (en) Sprocket wheel for VVT systems and preparation method thereof
CN102825255A (en) Production method for drive shaft of powder metallurgy planetary gear
CN112643046B (en) Internal flow channel unsupported forming method based on metal fuse wire material increase and decrease
CN109759908A (en) Polishing method is used in a kind of production and processing of precision die
CN1060981C (en) Manufacture of precise cop latch
CN116323041B (en) Method for manufacturing sintered gear
CN111872371B (en) Production process of clamping jaw for woodworking machine
CN101644264B (en) Method for manufacturing air compressor moving plate
CN202846386U (en) Diamond grinding wheel
CN206047910U (en) A kind of composite propeller core mould
KR20120066639A (en) Precision pressing and sintering of cutting inserts, particularly indexable cutting inserts
CN101602159B (en) Method for processing iron blocks
CN107900620A (en) A kind of manufacture method of Kato
CN117207362B (en) Low-noise marble trimming saw blade and preparation method thereof
CN115007862B (en) Method for producing vernier caliper body by metal injection molding
CN218397690U (en) Hot pressing die for producing diamond grinding wheel

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant
CP03 Change of name, title or address
CP03 Change of name, title or address

Address after: 233010 no.1288, Changqing South Road, Bengbu City, Anhui Province

Patentee after: ANHUI HOFO ELECTROMECHANICS Co.,Ltd.

Country or region after: China

Address before: 233000 No. 1288, Changchun South Road, high tech Development Zone, Bengbu City, Anhui Province

Patentee before: ANHUI HOFO ELECTROMECHANICS Co.,Ltd.

Country or region before: China