CN111761692A - Magnetic ring pressing die with movable mold core and pressing method - Google Patents
Magnetic ring pressing die with movable mold core and pressing method Download PDFInfo
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- CN111761692A CN111761692A CN202010442912.XA CN202010442912A CN111761692A CN 111761692 A CN111761692 A CN 111761692A CN 202010442912 A CN202010442912 A CN 202010442912A CN 111761692 A CN111761692 A CN 111761692A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
- B28B3/26—Extrusion dies
Abstract
A magnetic ring pressing mold with a movable mold core and a pressing method aim to solve the technical problems that the mold core cannot float up and down, the required demolding force is large in the demolding process of a high-density magnetic ring, the mold is easy to be damaged by pulling, galling or product defects are easy to cause in the processing process and the like in the prior art. The invention comprises an upper die, a lower die and a core, wherein a concave die is sleeved on the peripheral surface of the core, a radial gap is formed between the core and the concave die, a lower convex die for bearing materials is sleeved on the peripheral surface of the core, a top plate is arranged at one end of the lower convex die, which is far away from the upper die, one end of the lower convex die, which is far away from the top plate, is always positioned in the concave die, the upper end of the lower convex die, the inner peripheral surface of the concave die and the outer peripheral surface of the core are matched to form a forming cavity for processing the materials, an upper convex die positioned above the lower convex die mutually matches with the annular forming cavity to axially slide.
Description
Technical Field
The invention relates to the technical field of magnetic ring manufacturing, in particular to a magnetic ring pressing die with a movable mold core and a pressing method.
Background
In the current magnetic ring production process, the production mode of the magnetic ring pressed by dry powder occupies a large proportion, and the consumption of the high-density and high-performance bonded neodymium iron boron magnet is increased along with the gradual improvement of the market requirement on the performance of the magnetic ring. The traditional magnetic ring pressing die has the advantages that the middle core cannot float up and down, the die needs large demolding force when producing high-density and high-performance products, and particularly, the die is easy to damage by pulling, galling or product defects and the like in the processing process of the products with large height and size.
Chinese patent application No. CN201911292049.8 discloses an annular ferrite molding die, which comprises an upper die and a lower die; the lower die comprises a die bottom plate, a male die arranged on the die bottom plate, a female die movably positioned on the outer side of the male die, a core movably positioned in the middle of the male die, an upper top plate connected below the female die and positioned above the die bottom plate, a lower top plate arranged below the die bottom plate, a plurality of female die guide pillars penetrating through the die bottom plate and connecting the upper top plate and the lower top plate, a core guide pillar penetrating through the die bottom plate and connected between the core and the lower top plate, a stainless steel template arranged on the outer side of the female die, a support arranged at the bottom of the die bottom plate, a driving unit for driving the lower top plate to; the male die is cylindrical, a core hole is formed in the middle of the male die along the axial direction, and the core guide pillar and the core are both slidably located in the core hole; the stroke sensor is used for detecting the moving distance of an output shaft of the driving unit or the lower top plate; a material injection channel is formed in the stainless steel template, a female die material injection hole communicated with the material injection channel is formed in the side wall of the female die, and the female die material injection hole is movably communicated with the forming cavity; an inner sealing ring is embedded on the inner side wall of the male die; a first outer sealing ring, a second outer sealing ring and a third outer sealing ring are embedded on the outer side wall of the male die at intervals from top to bottom; when the female die slides up and down, the material injection hole of the female die is always positioned above the third outer sealing ring.
The above patent can produce the annular ferrite with different thickness specifications, the annular ferrite does not need to move in the demoulding process, the demoulding effect is good, the sealing ring is not easy to damage, the sealing effect is good, and the product quality is improved; however, in the demolding process of the molding mold, the annular ferrite is separated from the core and the wall surface of the female mold synchronously, and for the high-density annular ferrite, the shrinkage packing force of the magnetic ring to the core, the adhesion force between the magnetic ring and the female mold, the atmospheric pressure and the like need to be overcome simultaneously in the demolding process, and the demolding force required in the demolding process is very large, so that the problems of mold breakage, galling and the like or product defects are easily caused.
Disclosure of Invention
The invention provides a magnetic ring pressing mold with a movable mold core and a pressing method, aiming at overcoming the technical problems that a mold core cannot float up and down, the demolding force required in the demolding process of a high-density magnetic ring is large, the mold is easy to damage by pulling, galling or product defects and the like in the processing process, the mold core can float up and down in the processing process of the mold, so that the magnetic ring can be separated from a female mold and the mold core step by step, the demolding force required in the demolding process is small, the phenomenon of mold damage by pulling or galling can be effectively avoided, and the product defects are not easy to generate in the molded product.
In order to achieve the above object, the present invention adopts the following technical solutions.
The utility model provides a take movable core's magnetic ring embossing mold utensil, which comprises an upper die, lower mould and core, the cover is equipped with the die on the core is global, there is radial clearance between core and the die, the cover is equipped with the lower convex mould that is used for bearing the material on the core is global, the one end that the mould was kept away from to the lower convex mould is equipped with the roof, the one end that the roof was kept away from to the lower convex mould is located inside the die all the time, the upper end of lower convex mould, the inner peripheral surface of die and the outer peripheral face cooperation of core form the shaping chamber that is used for carrying out processing to the material, the last convex mould that is located the lower convex mould top is along annular shaping. In the traditional processing technology, after the magnetic ring is pressed, the magnetic ring is synchronously separated from the mold core and the female mold at one time, when the density of the magnetic ring is small, the shrinkage packing force of the magnetic ring on the mold core, the adhesive force between the magnetic ring and the mold core and the adhesive force between the magnetic ring and the female mold are small, the required demolding force in the demolding process of the magnetic ring is small, and the defects of the demolded product are not obvious; however, with the improvement of the product quality requirement of the market, the high-density and high-performance magnetic ring becomes a mainstream processed product, the shrinkage packing force of the high-density magnetic ring on the mold core, the adhesion between the magnetic ring and the mold core, and the adhesion between the magnetic ring and the female mold are large, and when the pressed magnetic ring is separated from the mold core and the female mold at one time, namely, when a traditional demolding mode is adopted, the problems of mold breakage, galling and the like or product defects are easily caused. The invention provides a magnetic ring pressing die with a movable core, wherein one end of the core, which is far away from an upper male die, is provided with a first driving piece arranged on a top plate, after a magnetic ring is pressed and formed, the lower male die moves upwards to eject the magnetic ring out of a forming cavity, the magnetic ring is separated from a female die, the core is driven by the first driving piece to move upwards synchronously along with the magnetic ring in the process, the magnetic ring and the core do not move relatively, after the magnetic ring is completely separated from the female die, the core is reset under the driving of the first driving piece, and the core is separated from the magnetic ring. The mold is not easy to be damaged and roughened, and the demolding process is gradually deepened, so that the surface quality of the magnetic ring after demolding is good, and a molded product is not easy to generate quality defects.
Preferably, a template for mounting the lower male die is arranged between the top plate and the female die, the template is parallel to the top plate, a first mounting hole penetrating through the template in the thickness direction is formed in the template, and the first mounting hole is coaxial with the mold core. The lower punch is mounted on the pattern plate, and a first driving member for controlling the movement of the core is mounted on the top plate, so as to ensure the mutual independence of the movement of the lower punch and the movement of the core, and the first mounting hole is used for penetrating the core, so as to ensure the normal action of the core.
Preferably, the lower punch holder is installed on one side, far away from the top plate, of the die plate, the lower punch holder with the T-shaped section comprises a body and a positioning piece located on one side, close to the top plate, of the body, the positioning piece is inserted into the first installation hole, and the lower punch holder, far away from the die plate, is detachably connected with a lower punch press block used for fixing a lower punch. The setting element has two effects, and one is first to guarantee that terrace die and core have good concentricity down, and its second carries out radial spacing to the core, avoids the core to reciprocate the in-process because of rocking about causing the surface quality of magnetic ring to descend.
Preferably, one side of the top plate close to the template is provided with ejection columns arranged along the length direction of the mold core, the first driving parts are cylinders, the number of the ejection columns is two, the ejection columns are symmetrically arranged on two sides of the first driving parts, and one end, far away from the top plate, of each ejection column is connected with the side face, close to the template, of the female mold. The movement of the core and the female die can be kept synchronous and can be separated, specifically, the movement of the female die is driven by a top column which is arranged on a top plate, the movement of the core is driven by a first driving part which is arranged on the top plate, when only the top plate acts, the movement of the female die and the core is synchronous, when only the first driving part acts or the movement of the top plate and the first driving part is asynchronous, the movement of the female die and the core is asynchronous; through the design, the movement of the concave die and the core can be combined to meet different processing occasions.
Preferably, the female die comprises an inner female die and an outer female die which are arranged concentrically, a positioning boss is arranged on the outer peripheral surface of the inner female die, which is close to the top plate, a positioning groove matched with the positioning boss is arranged on the inner peripheral surface of the outer female die, which is close to the top plate, a female die sleeve seat is arranged at one end, which is far away from the top plate, of the top column, a second mounting hole used for mounting the female die is arranged on the female die sleeve seat, and the second mounting hole is communicated along the thickness direction. The positioning boss and the positioning groove are used for ensuring that the outer concave die and the inner concave die have good installation accuracy.
Preferably, one side of the template, which is close to the top plate, is connected with one end of the stand column, the number of the stand columns is two, the stand columns are symmetrically arranged on two sides of the mold core, the other end of the stand column is provided with a second driving piece which drives the template to reciprocate along the length direction of the mold core, and the second driving piece is an air cylinder. The stand is used for driving the template action, and the template drives the action of lower terrace die again, and the figure of stand has two and symmetrical arrangement in the core both sides, and its purpose is the operation stationarity who promotes the template, and then promotes the stability that the terrace die removed.
Preferably, the upper die comprises an upper die plate located on one side, away from the top plate, of the upper male die, and one side, close to the top plate, of the upper die plate is detachably connected with an upper male die pressing block for limiting the upper male die.
Preferably, one side of the top plate, which is far away from the female die, is provided with two T-shaped blocks and two hook plates with L-shaped sections, and the hook plates are symmetrically arranged on two sides of the T-shaped blocks.
A pressing method using the magnetic ring pressing die with the movable core comprises the following steps:
(1) powder filling: adjusting the female die to float upwards through the movement of the top plate, and filling powder into the forming cavity after the upper end surface of the mold core is flush with the upper end surface of the female die;
(2) and (3) pressing and forming: after powder is filled, the upper die descends, the upper male die enters the forming cavity to pressurize the powder, the core driven by the top plate and the female die float downwards together, and the relative position of the female die and the core is unchanged in the process;
(3) pre-demolding: after the magnetic ring is pressed and formed, the upper die rises, and the upper male die is separated from the forming cavity;
(4) primary demolding: the female die floats downwards, the core is driven to move upwards by the first driving piece in the process, the downward floating amount of the female die is the same as the upward moving amount of the core, the lower male die moves upwards under the driving of the template, the magnetic ring is completely separated from the female die when the upper end surface of the lower male die is level with the upper end surface of the female die, and the core and the magnetic ring do not move relatively in the process;
(5) secondary demolding: the mold core is driven by the first driving piece to move downwards, and when the upper end face of the mold core is flush with the upper end face of the female mold, demolding of the magnetic ring is completed.
In conclusion, the invention has the following beneficial effects: the mold core can float up and down in the processing process of the mold, so that the magnetic ring can be separated from the female mold and the mold core step by step, the required demolding force is small in the demolding process, the phenomenon that the mold is damaged by pulling or roughened can be effectively avoided, and the formed product is not easy to generate product defects.
Drawings
Figure 1 is a schematic view of the invention as a whole.
Figure 2 is another schematic view of the invention as a whole.
FIG. 3 is a schematic view of one-time mold release in the present invention.
FIG. 4 is a schematic view of secondary demolding in the present invention.
Fig. 5 is a partially enlarged view of a position a in fig. 1.
In the figure:
the die comprises an upper die 1, a lower die 2, a core 3, a female die 4, an inner concave die 4a, an outer female die 4b, a lower male die 5, a body 5a, a positioning piece 5b, a top plate 6, a forming cavity 7, a first driving piece 8, a die plate 9, a first mounting hole 10, a lower male die holder 11, a lower male die pressing block 12, a top column 13, a positioning boss 14, a positioning groove 15, a female die sleeve holder 16, a second mounting hole 17, an upper die plate 18, an upper male die pressing block 19, a T-shaped block 20, a hook plate 21, a stand column 22 and a magnetic ring 23.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example (b):
as shown in fig. 1 to 5, a magnetic ring pressing mold with a movable mold core comprises an upper mold 1, a lower mold 2 and a mold core 3, wherein a concave mold 4 is sleeved on the peripheral surface of the mold core, a radial gap exists between the mold core and the concave mold, a lower convex mold 5 used for bearing materials is sleeved on the peripheral surface of the mold core, a top plate 6 is arranged at one end, away from the upper mold, of the lower convex mold, one end, away from the top plate, of the lower convex mold is always positioned inside the concave mold, the upper end of the lower convex mold, the inner peripheral surface of the concave mold and the outer peripheral surface of the mold core are matched to form a forming cavity 7 used for processing the materials, the upper convex mold positioned above the lower convex mold slides along the matching axial direction of the; a template 9 for mounting a lower male die is arranged between the top plate and the female die, the template is parallel to the top plate, a first mounting hole 10 which is through along the thickness direction of the template is arranged on the template, and the first mounting hole is coaxial with the mold core; a lower punch holder 11 is arranged on one side of the template far away from the top plate, the lower punch holder with the T-shaped section comprises a body 5a and a positioning piece 5b positioned on one side of the body close to the top plate, the positioning piece is inserted in the first mounting hole, and a lower punch pressing block 12 used for fixing a lower punch is detachably connected on the lower punch holder far away from the template; the side, close to the template, of the top plate is provided with ejection columns 13 arranged along the length direction of the mold core, the first driving part is an air cylinder, the number of the ejection columns is two, the ejection columns are symmetrically arranged on two sides of the first driving part, and one end, far away from the top plate, of each ejection column is connected with the side face, close to the template, of the female mold; the female die comprises an inner concave die 4a and an outer female die 4b which are concentrically arranged, a positioning boss 14 is arranged on the outer peripheral surface of the inner concave die close to the top plate, a positioning groove 15 matched with the positioning boss is arranged on the inner peripheral surface of the outer female die close to the top plate, a female die sleeve seat 16 is arranged at one end of the top column far away from the top plate, a second mounting hole 17 used for mounting the female die is arranged on the female die sleeve seat, and the second mounting hole is communicated along the thickness direction of the female die sleeve seat; one side of the template close to the top plate is connected with one end of an upright post 22, the number of the upright posts is two, the upright posts are symmetrically arranged on two sides of the core, the other end of each upright post is provided with a second driving piece for driving the template to reciprocate along the length direction of the core, and the second driving piece is an air cylinder; the upper die comprises an upper die plate 18 positioned on one side of the upper male die, which is far away from the top plate, and one side of the upper die plate, which is close to the top plate, is detachably connected with an upper male die pressing block 19 for limiting the upper male die; one side of the top plate, which is far away from the female die, is provided with a T-shaped block 20 and two hook plates 21 with L-shaped sections, and the hook plates are symmetrically arranged on two sides of the T-shaped block.
A pressing method using the magnetic ring pressing die with the movable core comprises the following steps:
(1) powder filling: adjusting the female die to float upwards through the movement of the top plate, and filling powder into the forming cavity after the upper end surface of the mold core is flush with the upper end surface of the female die;
(2) and (3) pressing and forming: after powder is filled, the upper die descends, the upper male die enters the forming cavity to pressurize the powder, the core driven by the top plate and the female die float downwards together, and the relative position of the female die and the core is unchanged in the process;
(3) pre-demolding: after the magnetic ring is pressed and formed, the upper die rises, and the upper male die is separated from the forming cavity;
(4) primary demolding: the female die floats downwards, the core is driven to move upwards by the first driving piece in the process, the downward floating amount of the female die is the same as the upward moving amount of the core, the lower male die moves upwards under the driving of the template, the magnetic ring is completely separated from the female die when the upper end surface of the lower male die is level with the upper end surface of the female die, and the core and the magnetic ring do not move relatively in the process;
(5) secondary demolding: the mold core is driven by the first driving piece to move downwards, and when the upper end face of the mold core is flush with the upper end face of the female mold, demolding of the magnetic ring is completed.
As shown in fig. 1 and 2, the upper die plate and the upper male die with a T-shaped cross section are sequentially arranged from top to bottom, the upper male die is fixed on the lower end face of the upper die plate through an upper male die pressing block, specifically, the upper male die pressing block is a ring-shaped member, the upper male die pressing block is sleeved on the upper male die, and then the upper die plate is connected with the upper male die pressing block through a bolt, so that the positioning and installation of the upper male die are completed, and when the upper male die needs to be replaced, the upper male die pressing block can be replaced only by detaching the upper male die pressing; the lower part of the lower male die is provided with a female die, the female die is arranged in a second mounting hole on a female die sleeve seat, the female die comprises an outer female die and an inner female die from outside to inside, the lower end of the female die sleeve seat is connected with the upper ends of ejection columns, the lower ends of the ejection columns are arranged on a top plate, a second driving piece used for driving a core to move up and down is arranged on the top plate, the two ejection columns are symmetrically arranged on two sides of the second driving piece, a template is arranged between the female die sleeve seat and the top plate, a first mounting hole concentric with the second mounting hole is formed in the template, a positioning piece of a lower male die seat is clamped in the first mounting hole, the lower male die is arranged on the upper end face of the lower male die seat through a lower male die pressing block, the mounting method is similar to that of the upper male die, the upper end of the lower male die is always positioned in the female die, the peripheral surface of.
The magnetic ring pressing process of the magnetic ring pressing die with the movable mold core is as follows:
(1) the concave die is adjusted to float upwards through the movement of the top plate, the position of the core is adjusted by the first driving piece, and after the upper end face of the core is flush with the upper end face of the concave die, powder is filled into a forming cavity formed by matching the core, the concave die and the lower convex die;
(2) after powder is filled, the upper die descends, the upper male die part slides into the forming cavity to pressurize the powder, the female die and the core synchronously float downwards under the drive of the top plate, and the position of the lower male die is not changed and the relative position of the female die and the core is not changed in the process;
(3) after the magnetic ring is pressed and formed, the upper die rises, and the upper male die is separated from the forming cavity;
(4) the die floats downwards, the first driving piece drives the die core to move upwards in the process, the downward floating amount of the die core is the same as the upward moving amount of the die core, the first driving piece is arranged on the top plate, the spatial position of the die core is not changed, the lower male die moves upwards under the driving of the die plate, when the upper end face of the lower male die is level with the upper end face of the die, the magnetic ring is completely separated from the die, namely the separation of the magnetic ring and the die is realized through the moving and matching of the lower male die and the die, and no relative movement exists between the die core and the magnetic ring in
(5) The mold core is driven by the first driving piece to move downwards, and when the upper end face of the mold core is flush with the upper end face of the female mold, demolding of the magnetic ring is completed.
Claims (9)
1. The utility model provides a take movable core's magnetic ring embossing mold utensil, comprises an upper die, lower mould and core, a serial communication port, the cover is equipped with the die on the core global, there is radial clearance between core and the die, the cover is equipped with the lower convex mould that is used for bearing the material on the core global, the one end that the mould was kept away from to the lower convex mould is equipped with the roof, the one end that the roof was kept away from to the lower convex mould is located inside the die all the time, the upper end of lower convex mould, the inner peripheral surface of die and the outer peripheral face cooperation of core form the shaping chamber that is used for carrying out processing to the material, the last convex mould that is located the lower convex mould top is along annular shaping chamber and.
2. A magnetic ring pressing mold with movable core as claimed in claim 1, wherein a mold plate for mounting the lower punch is provided between the top plate and the female mold, the mold plate is parallel to the top plate, the mold plate is provided with a first mounting hole penetrating therethrough in a thickness direction thereof, and the first mounting hole is coaxial with the core.
3. The magnetic ring pressing die with the movable core as claimed in claim 2, wherein the lower die holder is mounted on a side of the die plate away from the top plate, the lower die holder having a T-shaped cross section comprises a body and a positioning member located on a side of the body close to the top plate, the positioning member is inserted into the first mounting hole, and a lower punch press block for fixing the lower punch is detachably connected to the lower die holder away from the die plate.
4. A magnetic ring pressing mold with movable core as claimed in claim 3, wherein the top plate has two top pillars arranged along the length of the core at one side close to the mold plate, the first driving member is a cylinder, the number of the top pillars is two, and the top pillars are symmetrically arranged at both sides of the first driving member, and one end of the top pillar away from the top plate is connected to the side of the female mold close to the mold plate.
5. A magnetic ring pressing mold with movable core as claimed in claim 4, wherein the female mold comprises an inner female mold and an outer female mold arranged concentrically, the outer peripheral surface of the inner female mold near the top plate is provided with a positioning boss, the inner peripheral surface of the outer female mold near the top plate is provided with a positioning groove matching with the positioning boss, one end of the top pillar far away from the top plate is provided with a female mold sleeve seat, the female mold sleeve seat is provided with a second mounting hole for mounting the female mold, and the second mounting hole penetrates along the thickness direction of the female mold sleeve seat.
6. A magnetic ring pressing mold with movable core as claimed in claim 2, wherein one side of the mold plate near the top plate is connected to one end of the column, the number of the columns is two, and the columns are symmetrically arranged on both sides of the core, the other end of the column is provided with a second driving member for driving the mold plate to reciprocate along the length direction of the core, and the second driving member is a cylinder.
7. The magnetic ring pressing die with the movable core as claimed in claim 1, wherein the upper die comprises an upper die plate located on a side of the upper punch away from the top plate, and an upper punch press block for limiting the upper punch is detachably connected to a side of the upper die plate close to the top plate.
8. A magnetic ring pressing mold with movable core as claimed in claim 1, wherein the top plate is provided with a T-shaped block and two hook plates with L-shaped cross section at a side away from the female mold, and the hook plates are symmetrically arranged at two sides of the T-shaped block.
9. A pressing method using the magnetic ring pressing mold with the movable core as claimed in any one of claims 1 to 8, characterized by comprising the steps of:
(1) powder filling: adjusting the female die to float upwards through the movement of the top plate, and filling powder into the forming cavity after the upper end surface of the mold core is flush with the upper end surface of the female die;
(2) and (3) pressing and forming: after powder is filled, the upper die descends, the upper male die enters the forming cavity to pressurize the powder, the core driven by the top plate and the female die float downwards together, and the relative position of the female die and the core is unchanged in the process;
(3) pre-demolding: after the magnetic ring is pressed and formed, the upper die rises, and the upper male die is separated from the forming cavity;
(4) primary demolding: the female die floats downwards, the core is driven to move upwards by the first driving piece in the process, the downward floating amount of the female die is the same as the upward moving amount of the core, the lower male die moves upwards under the driving of the template, the magnetic ring is completely separated from the female die when the upper end surface of the lower male die is level with the upper end surface of the female die, and the core and the magnetic ring do not move relatively in the process;
(5) secondary demolding: the mold core is driven by the first driving piece to move downwards, and when the upper end face of the mold core is flush with the upper end face of the female mold, demolding of the magnetic ring is completed.
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| CN202010442912.XA CN111761692A (en) | 2020-05-22 | 2020-05-22 | Magnetic ring pressing die with movable mold core and pressing method |
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| CN202010442912.XA CN111761692A (en) | 2020-05-22 | 2020-05-22 | Magnetic ring pressing die with movable mold core and pressing method |
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