CN103372992A - Method of manufacturing finished powder product and powder forming device - Google Patents
Method of manufacturing finished powder product and powder forming device Download PDFInfo
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- CN103372992A CN103372992A CN2013101289211A CN201310128921A CN103372992A CN 103372992 A CN103372992 A CN 103372992A CN 2013101289211 A CN2013101289211 A CN 2013101289211A CN 201310128921 A CN201310128921 A CN 201310128921A CN 103372992 A CN103372992 A CN 103372992A
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- male mould
- upper male
- pressurization
- servo drive
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/16—Control arrangements for fluid-driven presses
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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
- B22F3/02—Compacting only
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
- B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/28—Arrangements for preventing distortion of, or damage to, presses or parts thereof
Abstract
The invention discloses a powder forming device (1) which comprises a punching die (11), a lower protruding die (21), an upper protruding die (31), an upper protruding die driving portion (72) driving the upper protruding die (31) to advance and withdraw, a pressurizing connection portion (76) and a plurality of pressurizing DDV servo drive devices (75) connected with the upper protruding die (31). The upper protruding die (31) advances and withdraws on the upper protruding die driving portion (72), and the pressurizing DDV servo drive devices (75) pressurize the powder material (P) in a filling portion (A). Before shifting to a pressurizing process, the upper protruding die driving portion (72) generates a force in opposite direction to the pressurizing force of the pressurizing DDV servo drive devices (75).
Description
Technical field
The present invention relates to a kind of manufacture method and powder forming device of powder forming product.
Background technology
As everyone knows, auto parts and components and electronic component, cutting with fields such as instruments in, be widely used metal dust or aluminium and ceramic powders are configured as the powder forming product, by these powder forming product are carried out the powder metallurgy sintered method that sintering produces the goods that are made of product of powder sintering.
According to powder metallurgy sintered method, possess punch die, with punch die together form filling part lower punch and can be in the powder forming device of the supported upper male mould in filling part advance and retreat ground, material powder is filled in the filling part of punch die formation, pushes this material powder and shaping powder delivery end formed products by upper male mould and lower punch.And produce product of powder sintering by under defined terms, these powder forming product being carried out sintering.
Above-mentioned powder forming product significantly shrink when sintering, and the size of its contraction has a huge impact the density of powder forming product.Therefore, wish to reduce by the be shaped deviation of Density Distribution of the powder forming product that of press-powder, the contraction during the inhibition sintering.
For this reason, deviation for the Density Distribution that reduces the powder forming product, punch die fixed form (for example with reference to patent documentation 1) and withdrawing pattern mode (for example with reference to patent documentation 2) are practical, the punch die fixed form is that punch die is fixed, upper male mould is descended, lower punch is risen, from both sides up and down the material powder in the filling part is carried out press-powder, the withdrawing pattern mode is that lower punch is fixed, punch die is descended with roughly 1/2nd the speed of upper male mould, relatively the material powder in the filling part is carried out press-powder from the below and form.But, if the quantity delivered because of the difference material powder of filling the position produces deviation when material powder is filled, then be difficult to avoid produce the deviation of the Density Distribution of powder forming product.
And, deviation for the Density Distribution that reduces the powder forming product, improve the precision of product of powder sintering, now developed the above-below direction position with DDV type servo drive control upper male mould, adjust the technology (for example with reference to patent documentation 3) of the decrement of material powder.
[patent documentation 1] Unexamined Patent 1-181997 of Japan communique,
[patent documentation 2] Unexamined Patent 5-92299 of Japan communique,
[patent documentation 3] JP 2010-234377 of Japan communique.
But, at a high speed and high output ground powder forming when going out the powder formed products, in the use punch drive division and pressurization all is configured in the situation of the powder forming device on the top board with DDV type servo drive, then irrelevant with the shape of powder forming product etc., need to further reduce the technology of deviation of the Density Distribution of powder forming product.At this, the upper male mould drive division plays the effect that makes the upper male mould high-speed mobile, and pressurization is played with height with DDV type servo drive and exported high-speed mobile and arrive the effect that the material powder of filling part pressurizes.
And, be exclusively used in DDV type servo drive in the situation of squeeze side (side that material powder is pressurizeed) will pressurizeing, when the upper male mould of high-speed mobile shifts to the pressurization operation, have in each pressurization and use the piston rod of DDV type servo drive to produce the poor of advance amount, produce the situation of gradient at the upper male mould fixed head.In this case, if the upper male mould fixed head shifts to the pressurization operation with the state that tilts, the situation that can not fully adjust by pressurization the decrement of material powder with DDV type servo drive is arranged then.
Summary of the invention
The invention provides a kind of manufacture method and powder forming device of powder forming product, in the situation that the decrement that makes upper male mould advance and retreat, adjust with DDV type servo drive by pressurization simultaneously material powder with respect to punch die by the upper male mould drive division is pressurizeed, pressurization in the operation of can pressurizeing uses DDV type servo drive to the stable decrement adjustment of powder forming product, and then can reduce the deviation of the Density Distribution of powder forming product.
A related powder forming device of technical scheme of the present invention possesses: punch die is formed with material powder and is filled in wherein filling part; Lower punch can be installed with respect to above-mentioned punch die with relatively moving, together forms filling part with above-mentioned punch die; Upper male mould can be configured in the top of above-mentioned punch die with advancing and retreat with respect to above-mentioned filling part; The upper male mould drive division links to each other with above-mentioned upper male mould via linking part, makes above-mentioned upper male mould advance and retreat; Seaming chuck is provided with above-mentioned upper male mould drive division; A plurality of pressurizations are located on the above-mentioned seaming chuck with DDV type servo drive, link to each other with above-mentioned upper male mould via the pressurization linking part with the ground configuration of above-mentioned linking part devices spaced apart; And control part, after above-mentioned upper male mould drive division advances above-mentioned upper male mould, the material powder in the above-mentioned filling part is pressurizeed with DDV type servo drive by above-mentioned a plurality of pressurizations; Wherein, above-mentioned control part constitutes, before the pressurization of the material powder in above-mentioned upper male mould begins above-mentioned filling part, make in above-mentioned a plurality of pressurization linking part at least one produce plus-pressure with above-mentioned pressurization usefulness DDV type servo drive opposite towards power.
The manufacture method of the powder forming product that another technical scheme of the present invention is related is carried out the manufacturing of powder forming product by powder forming device, and this powder forming device possesses: punch die is formed with material powder and is filled in wherein filling part; Lower punch can be installed with respect to above-mentioned punch die with relatively moving, together forms filling part with above-mentioned punch die; Upper male mould can be configured in the top of above-mentioned punch die with advancing and retreat with respect to above-mentioned filling part; The upper male mould drive division links to each other with above-mentioned upper male mould via linking part, makes above-mentioned upper male mould advance and retreat; Seaming chuck is provided with above-mentioned upper male mould drive division; And a plurality of pressurizations DDV type servo drive, be located on the above-mentioned seaming chuck, link to each other with above-mentioned upper male mould via the pressurization linking part with the ground configuration of above-mentioned linking part devices spaced apart; After above-mentioned upper male mould drive division advances above-mentioned upper male mould, the material powder in the above-mentioned filling part is pressurizeed with DDV type servo drive by above-mentioned a plurality of pressurizations; Wherein, before the pressurization of the material powder in above-mentioned upper male mould begins above-mentioned filling part, make in above-mentioned a plurality of pressurization linking part at least one produce plus-pressure with above-mentioned pressurization usefulness DDV type servo drive opposite towards power.
According to above-mentioned powder forming method and powder forming device, before upper male mould pressurizes to the material powder in the filling part, by make link upper male mould and pressurization with in a plurality of pressurization linking parts of DDV type servo drive at least one produce opposite with plus-pressure towards power, (for example via the upper male mould fixed head) each pressurization with DDV type servo drive in large pressurization of advance amount of piston rod use the effect of DDV type servo drive towards rearward power.Its result, upper male mould is the gradient of filling part little (for example being level), each pressurization reduces with the deviation of the piston rod advance amount of DDV type servo drive.
Its result, upper male mould reduces with respect to the gradient of filling part, can stably adjust and transfer to the pressurization of pressurization after the operation with the decrement of DDV type servo drive compression material powder.So, can reduce the deviation of Density Distribution, thereby can improve and the powder forming product are carried out sintering and make the precision of the product of powder sintering in the situation of product of powder sintering.
At this, reducing upper male mould refers to when being filled into material powder in the filling part and pressurizeing with respect to the gradient of filling part, the deviation of the piston rod advance amount of using DDV type servo drive by reducing to pressurize, the piston rod that respectively pressurizes with DDV type servo drive is advanced, adjust upward the gradient of upper male mould in the side of the decrement that can adjust material powder, for example, mean situation that the axis that makes upper male mould is corresponding with the axis of filling part etc.
Above-mentioned upper male mould drive division can be DDV type servo drive, and above-mentioned control part can make linking part compare the signal that is positioned at direction of advance rear one side with above-mentioned pressurization linking part to above-mentioned upper male mould drive division output.
In this case, because by the DDV type servo drive as the upper male mould drive division, with make linking part more corresponding near the position of rear one side of direction of advance than the pressurization linking part, so can make linking part stably produce opposite with the plus-pressure with DDV type servo drive of pressurizeing towards power.
Above-mentioned upper male mould drive division can be ball screw driving device, and above-mentioned control part can make above-mentioned linking part compare the signal that is positioned at direction of advance rear one side with above-mentioned pressurization linking part to above-mentioned upper male mould drive division output.
In this case, because by the ball screw driving device as the upper male mould drive division, make linking part with more corresponding near direction of advance rear one side position than the pressurization linking part, thus can make linking part stably produce opposite with the plus-pressure with DDV type servo drive of pressurizeing towards power.
Above-mentioned upper male mould drive division can be oil hydraulic cylinder, be provided with at above-mentioned oil hydraulic cylinder and adjust the back pressure guiding mechanism follow in the front of above-mentioned upper male mould and then the back pressure that produces, above-mentioned control part can export make in above-mentioned a plurality of pressurization linking part at least one because of above-mentioned back pressure produce with above-mentioned pressurization with the plus-pressure of DDV type servo drive opposite towards the signal of power.
In this case, make back pressure in the situation that the piston rod as the oil hydraulic cylinder of upper male mould drive division advances by adjustment, can make linking part stably produce opposite with the plus-pressure with DDV type servo drive of pressurizeing towards power.
According to powder forming method and powder forming device involved in the present invention, because before upper male mould pressurizes to the material powder in the filling part, by make link upper male mould and pressurization with in a plurality of pressurization linking parts of DDV type servo drive at least one produce opposite with plus-pressure towards power, so upper male mould reduces with respect to the gradient of filling part.Therefore, can stably transfer to the pressurization of pressurization after the operation with the decrement adjustment of DDV type servo drive compression material powder, its result can stably reduce the deviation of Density Distribution.
Description of drawings
Fig. 1 is the accompanying drawing of the general configuration of the related powder forming device of expression one embodiment of the present invention;
Fig. 2 is the accompanying drawing that the related upper male mould of expression one embodiment moves an example of the DDV type servo drive of usefulness and the configuration that DDV type servo drive is used in pressurization;
Fig. 3 is the accompanying drawing of an example of the structure of the expression one embodiment related upper male mould DDV type servo drive that moves usefulness;
Fig. 4 is the accompanying drawing that the related upper male mould of expression one embodiment moves an example of the DDV type servo drive of usefulness and the loop structure that DDV type servo drive is used in pressurization;
Fig. 5 is the related pressurization of expression one embodiment with the accompanying drawing of an example of the structure of DDV type servo drive;
Fig. 6 is the accompanying drawing of an example of the related control part of expression one embodiment;
Fig. 7 is the accompanying drawing of an example of the general configuration of the related database of expression one embodiment;
Fig. 8 is the roughly block diagram of action of the related powder forming device of expression one embodiment;
Fig. 9 is the roughly block diagram of effect of the related powder forming device of expression one embodiment;
Figure 10 A is the accompanying drawing of the action of the related powder forming device of explanation one embodiment, the action of upper male mould in the circulation of expression powder forming;
Figure 10 B is the accompanying drawing of the action of the related powder forming device of explanation one embodiment, among the presentation graphs 10A with the upper male mould of justifying the part that K surrounded, upper male mould with DDV type servo drive and the pressurization detailed action with DDV type servo drive.
Description of reference numerals:
A: filling part, P: metal dust (material powder), 1: powder forming device, 11: punch die, 21: lower punch, 31: upper male mould, 71: top board, 73: linking part, 76: the pressurization linking part, 72: upper male mould DDV type servo drive (upper male mould drive division), 75: pressurization DDV type servo drive.
The specific embodiment
Below, with reference to accompanying drawing embodiments of the present invention are described.
Fig. 1 is the accompanying drawing of the powder forming device 1 of this embodiment of expression.Powder forming device 1 possesses die assembly (mould) 10 and powder forming press 50, for example, advance in having filled obliquely metal dust (material powder) P and fixing punch die by upper male mould and lower punch and the punch die fixed form that retreats is carried out powder forming.
Die assembly 10 possesses the punch die 11 that central authorities are formed with through hole, be configured in the lower punch 21 of the below of punch die 11, and the upper male mould 31 that is configured in the top of punch die, forming filling part A in the through hole by lower punch 21 insertion punch dies 11, metal dust P is filled among this filling part A.
Punch die 11 is configured in the central portion of die plate 12, is formed with bullport 18H in template punching 12.
Lower punch 21 is from arranging highlightedly with the lower punch fixed head 13 that the base plate 14 that is fixed on the main base 68 relatively moves.Lower punch fixed head 13 links to each other with upper push pedal 44 with DDV type servo drive 22 via lower punch.Insert the bullport of upper push pedal 44 by the guide rod 40 that extends downwards from lower punch fixed head 13, lower punch fixed head 13 is suppressed with respect to the deviation of the horizontal direction of upper push pedal 44, and can relatively move at above-below direction.
And upper push pedal 44 links to each other with T connector 45, and then the T-slot 45A of T connector 45 links to each other with the T shaped part of push-down head 61.So, by push-down head 61 above-below directions advance and retreat, lower punch 21 and lower punch fixed head 13 can with upper push pedal 44 together above-below direction move.
And the guide rod 41 that is located at highlightedly the below of die plate 12 inserts in the bullport of base plate 14.So, die plate 12 can relatively move at above-below direction with respect to base plate 14.
And lower punch is advanced and retreat by the Position Control function with DDV type servo drive 22, thereby lower punch 21 can relatively move at above-below direction with respect to upper push pedal 44.So, lower punch 21 can be adjusted with respect to the relative position of push-down head 61 on above-below direction.
Upper male mould 31 is fixed on the upper male mould fixed head 34, and (direction of punch die 11) arranges highlightedly towards the below from upper male mould fixed head 34, can insert among the filling part A.
Upper male mould fixed head 34 is provided with guide rod 18 highlightedly, and guide rod 18 can be slidably inserted into respect to the bullport 18H that is formed on the die plate 12.So, when upper male mould 31 moves with respect to punch die 11 above-below directions, suppress upper male mould 31 with respect to punch die 11 deviations.And linking on the upper male mould fixed head 34 has the upper male mould that consists of powder forming press 50 to move with DDV type servo drive 75 and above-below direction with T connector and the pressurization of DDV type servo drive 72.
Forcing press downside main part 60 possesses push-down head 61, push-down head drive division 62, body supports section 63, push-down head drive division gripper shoe 64, push-down head base plate 65, dog link 66, push-down head guided plate 67, and main body pedestal 68.The disposal subject support portion 63 successively from the below, push-down head drive division gripper shoe 64, push-down head base plate 65, push-down head guided plate 67, and main body pedestal 68.Dog link 66 is located between push-down head base plate 65 and the push-down head guided plate 67 at upper and lower with extending upward.
And forcing press downside main part 60 links by connecting member 52 with forcing press upside main part 70.
Push-down head drive division 62 possesses the push-down head CD-ROM drive motor 62M that is located on the push-down head drive division gripper shoe 64, be located at the drive pulley 62A on the rotating shaft of push-down head CD-ROM drive motor 62M, transmit band 62B, follow-up pulley 62C, and the push-down head driving shaft 62D concentric with follow-up pulley 62C.According to drive division 62, be wound on drive pulley 62A and the follow-up pulley 62C owing to transmit band 62B, so the rotation of push-down head CD-ROM drive motor 62M is transmitted to follow-up pulley 62C, therefore push-down head driving shaft 62D rotates.
And the convex thread 62E that is formed on front end one side of push-down head driving shaft 62D screws with recessed screw thread 61A from the central authorities of the downside end face of push-down head 61 along Axis Extension, push-down head driving shaft 62D rotation, and therefore push-down head 61 rises and descends.
Push-down head 61 side below push-down head 61 is formed with the recessed screw thread 61A that can engage with convex thread 62E.Push-down head 61 inserts among the guide member 67A that is located on the push-down head guided plate 67, and can be at the upper and lower upward sliding.Push-down head 61 is that base end part (below one side) is fixed on the push-down head base plate 65, and extends upward from push-down head base plate 65.
Push-down head base plate 65 in the central section is formed with through hole 65A, and the recessed screw thread 61A of push-down head 61 is concentric with through hole 65A.Push-down head driving shaft 62D inserts among the recessed screw thread 61A of push-down head 61, and convex thread 62E and recessed screw thread 61A screw.
And, because dog link 66 is formed through hole 65B on push-down head base plate 65, so prevented in the situation of the push-down head driving shaft rotation of push-down head CD-ROM drive motor 62M push-down head 61 and 65 rotations of push-down head base plate.
Its result, if the push-down head driving shaft of push-down head CD-ROM drive motor 62M rotation, then the recessed screw thread 61A of the convex thread 62E of push-down head driving shaft 62D and push-down head 61 screws, and the rotation transformation of push-down head CD-ROM drive motor 62M becomes the movement of above-below direction, and therefore push-down head 61 advances and retreat at above-below direction.
Forcing press upside main part 70 possesses top board 71, upper male mould DDV type servo drive (upper male mould drive division) 72, and pressurization DDV type servo drive 75.In this embodiment, for example shown in Figure 2, central authorities at top board 71 upper surfaces are provided with upper male mould DDV type servo drive 72, it is one group that DDV type servo drive 75 for example is two, each group is across DDV type servo drive 72 and filling part A configuration, and two groups of DDV type servo drives 75 dispose mutually orthogonally.In addition, double dot dash line has represented upper male mould 31, punch die 11, and filling part A.
According to this structure, can adjust the above-below direction position of upper male mould 31 on the axis direction of upper male mould 31, and the inclination of upper male mould 31 front end faces (across the filling part A relative above-below direction position, position of subtend diametrically).
Upper male mould is formed with recess with DDV type servo drive 72 at the front end edge circumferencial direction of piston rod, and this recess links to each other with the T connector 34B that forms on the protuberance 34A of the central portion that is formed at upper male mould fixed head 34.So, consisted of the linking part 73 of upper male mould with DD type servo drive 72 and upper male mould 31.
And upper male mould moves upper male mould fixed head 34 and upper male mould 31 above-below directions with DDV type servo drive 72 by the piston rod advance and retreat.
Pressurization can swingingly link to each other with upper male mould fixed head 34 via pressurization linking part 76 with DDV type servo drive 75.Advance by piston rod, pressurizeed by the metal dust P in 31 couples of filling part A of upper male mould via upper male mould fixed head 34.And when upper male mould made upper male mould 31 knee-actions with DDV type servo drive 72, pressurization was advanced and retreat at above-below direction with the piston rod of DDV type servo drive 75.
In this embodiment, upper male mould for example is general configuration shown in Figure 3 with DDV type servo drive 72.In addition, being used for making the lower punch of lower punch 21 advance and retreat also is same structure with DDV type servo drive 22.
Below, with reference to Fig. 3 to consisting of upper male mould with the DDV(Direct Drive Volume Control of the two-way drive-in of DDV type servo drive 72) servo drive describes.
Upper male mould possesses adder 72F with DDV type servo drive 72, servo amplifier 72G, servo motor 72M, oil pressure pump 72P, oil hydraulic cylinder 72C, and position-detection sensor 72D.Position-detection sensor 72D detects the advance and retreat amount of the piston rod of oil hydraulic cylinder 72C.
And as shown in Figure 4, upper male mould is connected with oil pressure pump 72P with DDV type servo drive 72 side by side with respect to oil hydraulic cylinder 72C, and working oil storing section 72S, and operating oil tank 72T can adjust the difference of the working oil of oil hydraulic cylinder 72C.
And working oil returns a side and is provided with to fall and prevents valve 72V when the piston rod of oil hydraulic cylinder 72C advances, fall prevent valve 72V become open mode then piston rod advance, fall prevent valve 72V become closed condition then advancing of piston rod stop.
Its result, control signal make progress punch with 72 outputs of DDV type servo drive, the advance and retreat quantitative change of the piston rod of oil hydraulic cylinder 72C, and upper male mould therefore can be by Position Control with DDV type servo drive 72.
And the piston rod side of oil hydraulic cylinder 72C and cylinder cap side are connected with respectively pressure sensor 72A, 72B, can detect the pressure of the working oil of piston rod side and cylinder cap side.
In addition, beyond any doubt, the DDV type servo drive of above-mentioned known other form in addition also can be suitable for.
And pressurization is general configuration shown in Figure 5 with DDV type servo drive 75, in the pressurization operation, adjusts the deviation of each locational advance amount of upper male mould 31 when the metal dust P in 31 couples of filling part A of upper male mould pressurizes.
Pressurization possesses adder 75F with DDV type servo drive 75, servo amplifier 75G, servo motor 75M, the oil pressure pump 75P of pushing side special use, oil hydraulic cylinder 75C, and position-detection sensor 75D.Position-detection sensor 75D detects the advance amount of the piston rod of oil hydraulic cylinder 75C.
And pressurization is connected with oil pressure pump 75P side by side with respect to oil hydraulic cylinder 75C with DDV type servo drive 75 as shown in Figure 4, working oil storing section 75S, and operating oil tank 75T, and prefill valve 75V can adjust the difference of the working oil of oil hydraulic cylinder 75C.
Prefill valve 75V can be controlled and be opened and closed with the pilot pressure of the working oil of pump 78 supplies from the guide.When the piston rod of oil hydraulic cylinder 75C advances, make prefill valve 75V be " opening " by pilot pressure, can suck from operating oil tank 75T to oil hydraulic cylinder 75C a large amount of oil, pressurization advances at utmost speed with the piston rod of DDV type servo drive 75.And, stop working oil from oil hydraulic cylinder 75C to operating oil tank 75T adverse current by prefill valve 75V, make pressurization corresponding with the pressurization operation with the piston rod of DDV type servo drive 75.And then prefill valve 75V plays a role as check valve when pressurization retreats with the piston rod of DDV type servo drive 75.Like this, prefill valve 75V suitably control pressurization with the operation that advances at utmost speed, pressurizes of the piston rod of DDV type servo drive 75, retreat.
And, be connected with pressure sensor 75A in piston rod one side of oil hydraulic cylinder 75C, pressure that can testing oil.
Its result exports control signals to pressurization with DDV type servo drive 75 by pressure sensor 75A, and the advance amount of the piston rod of oil hydraulic cylinder 75C is adjusted, and pressurizes with plus-pressure control and the Position Control of DDV type servo drive 75.
In addition, beyond any doubt, the DDV type servo drive of above-mentioned known other form in addition also can be suitable for.
Laser shapometer (not shown) is configured in the outside of punch die 11, measures the thickness of the powder forming product W that transports.For example, reverberation while the laser that powder forming product W is moved receive irradiation, finish to hold the thickness that scans powder forming product W towards metering from the metering starting end, detect shape data, send from the metering starting end to the thickness that measures the powder forming product W between the end end to control part 80.
And operational part 83 comparable data storehouses 85 calculate each pressurization with the piston rod advance amount of DDV type servo drive 75 based on the determination data of laser shapometer, and to each pressurization with 75 outputs of DDV type servo drive.In this embodiment, based on the determination data from the laser shapometer, can control independently respectively on the piston rod advance amount this point of a plurality of pressurizations with DDV type servo drive 75 preferred 4 axle control modes (multiaxis control mode).
And, because of the reason such as the pressurization characteristic in the powder forming is known, disobey in the situation of each pressurization of Data Control according to surveying and determination with the piston rod advance amount of DDV type servo drive 75, also applicable take some pressurizations with DDV type servo drive 75 as main drive, control the master-slave mode of other pressurization usefulness DDV type servo drive 75 as benchmark take the position of main drive.
And, also can be the relevant signals such as vibration generation when using the inclination of DDV type servo drive 22 to fill and fill to lower punch with 22 outputs of DDV type servo drive and lower punch.
For example store database shown in Figure 6 85 in the hard disk unit 84.
Then, with reference to Fig. 8～Figure 10 powder forming device 1 is described to the action of shifting to the pressurization operation from filling metal dust P.
Fig. 8, Fig. 9 are the action of the related powder forming device 1 of explanation one embodiment and the accompanying drawing that roughly acts on.
And, Figure 10 A and Figure 10 B be the upper male mould 13(upper male mould of expression powder forming device 1 with DDV type servo drive 72 and pressurization with DDV type servo drive 75) the line chart of action.Figure 10 A is the accompanying drawing that represents in detail the action of upper male mould 31 in the powder forming circulation.Figure 10 B be among the detailed presentation graphs 10A justifying the upper male mould 31 of the part that K surrounded, upper male mould is with DDV type servo drive 72, and pressurization is with the accompanying drawing of the action of DDV type servo drive 75.
(1) at first, control part 80 upper male mould 31 stop at top dead-centre during fill metal dust P(S1 by driving crawler shoe case 90 to filling part A).
(2) then, the signal that control part 80 outputs descend upper male mould 31 advances with DDV type servo drive 72 and pressurization each piston rod with DDV type servo drive 75 by making upper male mould, makes 34 declines (S2) of upper male mould fixed head.
At this moment, control part 80 is opened prefill valve 75V by exporting with pump 78 to the guide, a large amount of working oils is flowed into pressurize with DDV type servo drive 75.Like this, control part 80 makes pressurization corresponding with advancing of high speed (low pressure) with DDV type servo drive 75.
So, upper male mould advances at utmost speed with the piston rod of DDV type servo drive 75 with DDV type servo drive 72 and pressurization, shown in Figure 10 A, and at a high speed declines of upper male mould 31.
(3) then, before the pressurization operation transfer that upwards punch 31 pressurizes to the metal dust P in the filling part A with DDV type servo drive 75 by pressurization, control part 80 makes the above-below direction position of linking part 73 compare the signal (S3) that is positioned at direction of advance rear one side with the above-below direction position of pressurization linking part 76 with respect to upper male mould with 72 outputs of DDV type servo drive.
Its result shown in Figure 10 B, is positioned at the h place, pressurization linking part 76 top that links to each other with the piston rod of DDV type servo drive 75 with pressurization with linking part 73 that upper male mould links to each other with the piston rod of DDV type servo drive 72.At this, Figure 10 B has represented moment of being surrounded to justify K among Figure 10 A in detail.
In addition, the above-below direction position that makes linking part 73 compare with the above-below direction position of pressurization linking part 76 signal that is arranged in rear one side mean make linking part 73 and pressurization linking part 76 be located at least one of a plurality of pressurization linking parts 76 upper produce with pressurization use the plus-pressure of DDV type servo drive 75 opposite towards the signal of power.
Effect among this S3 is for example shown in Figure 9.
（3－1）
By the output with respect to upper male mould usefulness DDV type servo drive 72 among the S3, in pressurization linking part 76 additional power (S31) up.
（3-2）
In S31, if in the additional power up of pressurization linking part 76, then the gradient of upper male mould fixed head 34 for example becomes level, and the axis that is adjusted to upper male mould 31 and the axis of filling part A be consistent (S32) basically.
（3－3）
If it is basically consistent with the axis of filling part A that the gradient of upper male mould fixed head 34 is adjusted to the axis of upper male mould 31, then pressurization can stably be advanced by the metal dust P in filling part A with the piston rod of DDV type servo drive 75.
Its result, in the situation of transferring to the pressurization operation, can be by pressurization with before the piston rod of DDV type servo drive 75 and then the abundant decrement (S33) of stably adjusting metal dust P.
(4) as shown in Figure 8, after shifting to the pressurization operation, adjust the piston rod advance amount that DDV type servo drive 75 is used in pressurization, reduce the deviation (S4) of the decrement of metal dust P.
(5) afterwards, control part 80 is exported with pump 78 to the guide, prefill valve 75V is closed, make the working oil of high pressure flow into pressurization DDV type servo drive 75 from pump 75P, while carrying out the decrement adjustment piston rod that pressurizes with DDV type servo drive 75 is advanced, shown in Figure 10 A, in the pressurization operation, metal dust P is pressurizeed.And control part 80 arrives at upper male mould 31 and after bottom dead center upper male mould 31 is remained on bottom dead centre.
Afterwards, control part 80 stops the driving of each pump 72P, 75P, stops the pressurization that upper male mould carries out with DDV type servo drive 75 with DDV type servo drive 72, pressurization and removes pressure.Then, control part 80 is by making pump 72P towards discharging working oil upper male mould fixed head 34 and upper male mould 31 be risen with what the piston rod of DDV type servo drive 72 rose with upper male mould.At this moment, pressurization with DDV type servo drive 75 in, working oil from working oil storing section 75S with respect to oil hydraulic cylinder 75C to the side inflow that piston rod is risen.
According to powder forming device 1, because before the pressurization of the metal dust P in 31 couples of filling part A of beginning upper male mould, make at least one generation power up in a plurality of pressurization linking parts 76 that link the pressurization usefulness DDV type servo drive 75 that is located on the upper male mould fixed head 34, so act on the power that has up in pressurization with DDV type servo drive 75, each pressurization reduces with the deviation of the piston rod advance amount of DDV servo drive 75.Its result, upper male mould 31 reduces with respect to the gradient of filling part A, can stably adjust pressurization after the pressurization operation shifts with the decrement of DDV type servo drive 75 compressed metal powder P, reduces the deviation of Density Distribution.
Its result can improve the precision of product of powder sintering.
And, because pressurization reduces with the deviation that the piston rod advance and retreat amount of DDV type servo drive 75 is adjusted to the decrement of metal dust P, so can reduce the deviation of the Density Distribution of powder forming product W.Its result, the little powder forming product of deviation of the Density Distribution that can effectively be shaped.
And, according to powder forming device 1, correctly measure at short notice in contact the deviation of the thickness of the powder forming product W that is shaped owing to and powder forming product W direct by the laser shapometer, feed back with the Position Control of DDV type servo drive 75 to pressurization, so can be easily and effectively adjust the deviation of the thickness of next powder forming product W.
In addition, the present invention is not limited in above-mentioned embodiment, can carry out various changes in the scope that does not break away from the invention aim.
For example, in the above-described embodiment, being upper male mould to the upper male mould drive division is illustrated with the situation of DDV type servo drive 72, but also can use ball screw driving device as the upper male mould drive division.In this case, same with DDV type servo drive 72 with upper male mould, also can make to ball screw driving device output corresponding to making linking part 73 and pressurization linking part 76 be in a ratio of the structure of signal of the position of direction of advance rear one side.
And, be oil hydraulic cylinder at the upper male mould drive division, be provided with to adjust at this oil hydraulic cylinder and follow in the situation of the back pressure guiding mechanism of the front of upper male mould 31 and then the back pressure that produces, also can be with respect to the output of back pressure guiding mechanism by back pressure make in a plurality of pressurization linking parts 76 at least one produce with pressurization use the plus-pressure of DDV type servo drive 75 opposite towards the structure of signal of power.In this case, as the back pressure guiding mechanism, produce pressure-regulating valve on the oil pipeline of back pressure or flow rate regulating valve etc. in the situation that also can use the piston rod that is located at oil hydraulic cylinder that upper male mould 31 is descended.
And, in the above-described embodiment, powder forming device 1 is used upper male mould DDV type servo drive 72, ball screw driving device perhaps possesses to adjust to follow in the oil hydraulic cylinder of the back pressure guiding mechanism of the front of upper male mould and then the back pressure that the produces situation as the upper male mould drive division and is illustrated.But, also can consist of by other mechanism the upper male mould drive division.
And, in the above-described embodiment, powder forming device 1 is possessed four pressurizations be illustrated with the situation of DDV type servo drive 75.But, for example also can possess the structure that DDV type servo drive 75 is used in four a plurality of pressurizations in addition.
And in the above-described embodiment, the situation that powder forming device 1 is possessed the laser shapometer as the measuring shape mechanism of powder forming product W is illustrated.But, for example also can replace the laser shapometer and use the shapometer that has adopted ultrasonic wave or radioactive ray, can also be the structure that powder forming device 1 does not possess measuring shape mechanism.
And, in the above-described embodiment, when there is position outside the permissible range in the thickness about powder forming product W, adjusts pressurization and be illustrated with the situation of the advance amount of the piston rod of DDV type servo drive 75.But, also can not set permissible range, and for example be according to each press-powder, based on the structure of adjusting the advance amount of piston rod from the signal of laser shapometer.
And in the above-described embodiment, to when calculating the piston rod advance amount of each pressurization usefulness DDV type servo drive 75, the situation in operational part 83 comparable data storehouses 85 is illustrated in control part 80.But, for example also can be that operational part 83 calculates the piston rod advance amount based on the formula of setting.
In the above-described embodiment, be to be illustrated by having the situation that the CNC control mode that is located at the thread structure on push-down head driving shaft 62D and the push-down head 61 carries out to the Position Control of lower punch 21.But, also can use CNC control mode control mode or the drive unit beyond the thread structure in addition to make lower punch 21 actions.And, can also replace encoder and consist of with other the position finding mechanism such as linear scale.
In the above-described embodiment, lower punch 21 is illustrated by the situation that lower punch can move with DDV type servo drive 22.But, for example also can be that powder forming device 1 does not use lower punch with the structure of DDV type servo drive 22, can also be the structure that punch die 11 is descended relatively with respect to lower punch 21.
And, also can be to fill to filling part A in the situation of metal dust P, use lower punch to fill obliquely with DDV type servo drive 22, perhaps make the structure of metal dust P vibration.
In the above-described embodiment, to the punch die that to be, upper male mould 31 fixing with respect to powder forming press 50 with punch die 11 and lower punch 21 advance with respect to punch die 11 of the shaping in the powder forming device 1 fixedly the forming mode situation of carrying out be illustrated.But the present invention also can be applicable to the powder forming device 1 that forms by the withdrawing pattern forming mode.
In the above-described embodiment, be respectively that single situation is illustrated to lower punch 21 and upper male mould 31.But, also can be that the one party of lower punch 21 and upper male mould 31 or both sides are structures that the punch by multistage advance and retreat on the press-powder direction consists of, or lower punch 21, the one party of upper male mould 31 or the structure that both sides possess core bar.
And, in the above-described embodiment, be illustrated as material powder be shaped the situation of powder formed products W using metal dust P.But, also can substituted metal powder P and use superhard alloy powder, ceramic powders, metal ceramic powder etc., produce cutting insert, cutting element, other various goods.
And, in the above-described embodiment, be that the situation of ROM is illustrated to being used for stored program storage medium.But, such as the storing mechanism beyond the ROM such as storage card that also can use the storage mediums such as EP-ROM, hard disk, floppy disk, CD, fixedness.And, beyond any doubt, can be suitable for the known method that realizes the effect of above-mentioned embodiment by the processing of control part 80.
Manufacture method according to powder forming device involved in the present invention and powder forming product, because by stably adjusting pressurization can be produced Density Distribution effectively with the piston rod advance amount of DDV type servo drive the little powder forming product of deviation, so can be used industrial.
Claims (5)
1. powder forming device possesses: punch die is formed with material powder and is filled in wherein filling part; Lower punch can be installed with respect to above-mentioned punch die with relatively moving, together forms filling part with above-mentioned punch die; Upper male mould can be configured in the top of above-mentioned punch die with advancing and retreat with respect to above-mentioned filling part; The upper male mould drive division links to each other with above-mentioned upper male mould via linking part, makes above-mentioned upper male mould advance and retreat; Seaming chuck is provided with above-mentioned upper male mould drive division; A plurality of pressurizations are located on the above-mentioned seaming chuck with DDV type servo drive, link to each other with above-mentioned upper male mould via the pressurization linking part with the ground configuration of above-mentioned linking part devices spaced apart; And control part, after above-mentioned upper male mould drive division advances above-mentioned upper male mould, the material powder in the above-mentioned filling part is pressurizeed with DDV type servo drive by above-mentioned a plurality of pressurizations; It is characterized in that,
Above-mentioned control part constitutes, before the pressurization of the material powder in above-mentioned upper male mould begins above-mentioned filling part, make in above-mentioned a plurality of pressurization linking part at least one produce plus-pressure with above-mentioned pressurization usefulness DDV type servo drive opposite towards power.
2. powder forming device as claimed in claim 1 is characterized in that,
Above-mentioned upper male mould drive division is upper male mould DDV type servo drive,
Above-mentioned control part makes linking part compare the signal that is positioned at direction of advance rear one side with above-mentioned pressurization linking part to above-mentioned upper male mould drive division output.
3. powder forming device as claimed in claim 1 is characterized in that,
Above-mentioned upper male mould drive division is ball screw driving device,
Above-mentioned control part makes linking part compare the signal that is positioned at direction of advance rear one side with above-mentioned pressurization linking part to above-mentioned upper male mould drive division output.
4. powder forming device as claimed in claim 1 is characterized in that,
Above-mentioned upper male mould drive division is oil hydraulic cylinder, is provided with at above-mentioned oil hydraulic cylinder and adjusts the back pressure guiding mechanism of following in the back pressure of the front of above-mentioned upper male mould and then generation,
Above-mentioned control part to the output of above-mentioned back pressure guiding mechanism make in above-mentioned a plurality of pressurization linking part at least one because of above-mentioned back pressure produce with above-mentioned pressurization with the plus-pressure of DDV type servo drive opposite towards the signal of power.
5. the manufacture method of powder forming product is carried out the manufacturing of powder forming product by powder forming device, and this powder forming device possesses: punch die is formed with material powder and is filled in wherein filling part; Lower punch can be installed with respect to above-mentioned punch die with relatively moving, together forms filling part with above-mentioned punch die; Upper male mould can be configured in the top of above-mentioned punch die with advancing and retreat with respect to above-mentioned filling part; The upper male mould drive division links to each other with above-mentioned upper male mould via linking part, makes above-mentioned upper male mould advance and retreat; Seaming chuck is provided with above-mentioned upper male mould drive division; And a plurality of pressurizations DDV type servo drive, be located on the above-mentioned seaming chuck, link to each other with above-mentioned upper male mould via the pressurization linking part with the ground configuration of above-mentioned linking part devices spaced apart; After above-mentioned upper male mould drive division advances above-mentioned upper male mould, the material powder in the above-mentioned filling part is pressurizeed with DDV type servo drive by above-mentioned a plurality of pressurizations; It is characterized in that,
Before the pressurization of the material powder in above-mentioned upper male mould begins above-mentioned filling part, make in above-mentioned a plurality of pressurization linking part at least one produce plus-pressure with above-mentioned pressurization usefulness DDV type servo drive opposite towards power.
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| JP2012093885A JP2013220446A (en) | 2012-04-17 | 2012-04-17 | Method of manufacturing powder molding and powder molding apparatus |
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Also Published As
| Publication number | Publication date |
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| KR20130117677A (en) | 2013-10-28 |
| CN103372992B (en) | 2016-03-02 |
| JP2013220446A (en) | 2013-10-28 |
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