CN210548089U

CN210548089U - Hollow cylindrical neodymium iron boron pressed compact forming device

Info

Publication number: CN210548089U
Application number: CN201921156939.1U
Authority: CN
Inventors: 马跃华; 刘楠
Original assignee: Youyan Rare Earth Rongcheng Co Ltd
Current assignee: Youyan Rare Earth Rongcheng Co Ltd
Priority date: 2019-07-23
Filing date: 2019-07-23
Publication date: 2020-05-19
Anticipated expiration: 2029-07-23

Abstract

The utility model belongs to the technical field of hollow cylindrical neodymium iron boron products technique of preparing and specifically relates to a hollow cylindrical neodymium iron boron pressed compact forming device, its characterized in that the device comprises cylindrical forming die and plug location release subassembly, cylindrical forming die constitute by lower bolster, front bezel, back template, cope match-plate pattern, left template and right template, plug location release subassembly establish in the lower bolster top, plug location release subassembly by top board, middle fixed plate, bottom board, plug fixed block, location plug, plug fixed plectrum, plug release push rod, baffle, reset spring constitute, the lower terminal surface of top board be connected with left template and right template location respectively, release position through the fixed plug location release subassembly of top board has simple structure, suppresses effectually, becomes to produce efficiently, Low production cost and the like.

Description

Hollow cylindrical neodymium iron boron pressed compact forming device

Technical Field

The utility model belongs to the technical field of hollow cylindrical neodymium iron boron product preparation technique and specifically relates to a simple structure, suppression are effectual, become hollow cylindrical neodymium iron boron pressed compact forming device efficient, low in production cost.

Background

As is known, neodymium iron boron is simply a magnet, and is different from the magnet seen in our ordinary times, the magnet has excellent magnetic performance and is called as 'King', the neodymium iron boron contains a large amount of rare earth elements of neodymium, iron and boron, the characteristics of the magnet are hard and brittle, the surface of the magnet is very easy to oxidize and corrode, the neodymium iron boron needs to be subjected to surface coating treatment, surface chemical passivation is one of good solutions, the neodymium iron boron is used as a rare earth permanent magnet material and has extremely high magnetic energy and coercive force, and meanwhile, the advantage of high energy density enables the neodymium iron boron permanent magnet material to be widely applied in modern industry and electronic technology, so that the miniaturization, light weight and thinning of instruments, electro-acoustic motors, magnetic separation and magnetization and other equipment become possible. The Nd-Fe-B alloy has the advantages of high cost performance and good mechanical property.

At present, the hole is generally drawn on cubic product to the shaping mode of current hollow cylinder type product, takes out cylindrical hollow product, and this kind of processing mode is long, the inefficiency through the shaping of cubic product, the process of drawing out of round hole, drawing out of cylinder product, and the waste material after drawing out the hole still need broken the utilization again like this, has caused to produce originally low not enough, and the hollow cylinder type product of current preparation generally all needs the plug structure, but hardly guarantees the central point of plug and puts.

Disclosure of Invention

The utility model aims at solving the deficiencies of the prior art, providing a simple structure, suppression are effectual, become hollow cylindrical neodymium iron boron pressed compact forming device efficient, low in production cost.

The utility model provides a technical scheme that its technical problem adopted is:

the utility model provides a hollow cylindrical neodymium iron boron pressed compact forming device, its characterized in that the device comprises cylindrical forming die and plug location release subassembly, cylindrical forming die constitute by lower bolster, front bezel, back template, cope match-plate pattern, left template and right template, cope match-plate pattern and lower bolster around respectively with left template, right template, front bezel and back template interconnect, the up end of lower bolster be equipped with the cross-section and be semicircular bar groove, the lower terminal surface of cope match-plate pattern be equipped with the bar groove symmetrical bar groove on the lower bolster, front bezel, back template, the bar groove of cope match-plate pattern, the mutual lock of bar groove of lower bolster form the cylinder chamber, plug location release subassembly establish in the lower bolster top, plug location release subassembly by top locating plate, middle fixed plate, lower locating plate, plug fixed block, The upper positioning plate, the middle fixing plate and the lower positioning plate are connected with each other in the vertical direction, the middle part of the lower end face of the lower positioning plate is provided with a strip-shaped groove with openings at the front end and the rear end, a core rod fixing block is arranged in the strip-shaped groove, a core rod releasing push rod is arranged at the upper end of the core rod fixing block, the lower end of the core rod releasing push rod is connected with the core rod fixing block, the upper end of the core rod releasing push rod sequentially penetrates through the lower positioning plate, the middle fixing plate and the upper positioning plate to be connected with the baffle plate, the core rod releasing push rod extending out of the upper positioning plate is sleeved with a return spring, the lower end of the return spring is contacted with the upper positioning plate, the upper end of the return spring is contacted with the baffle plate, the core rod releasing push rod is in an upward moving state through the return spring, the lower end face of the core rod, the front end and the rear end of the positioning core rod are respectively contacted with the surfaces of the front template and the rear template, the lower positioning plates on two sides of the strip-shaped groove are respectively provided with a core rod fixing shifting piece, the upper end of the core rod fixing shifting piece extends into the lower positioning plate and is fixedly connected with the lower positioning plate, the lower end of the core rod fixing shifting piece inclines towards the strip-shaped groove and is in contact clamping connection with the positioning core rod fixed in the arc-shaped groove so as to fix the positioning core rod, the lower end surface of the upper positioning plate is respectively in positioning connection with the left template and the right template, and the releasing position of the core rod positioning releasing assembly is fixed through the.

The tip tangent plane of the semicircular groove of cope match-plate pattern and lower bolster coincide mutually with the tangent plane of lower bolster or cope match-plate pattern.

Left side template and right template's up end be equipped with the bar boss, plug location release subassembly in the lower terminal surface of the locating plate be equipped with bar boss matched with bar spread groove, cooperate through bar boss and bar spread groove and realize the location of plug location release subassembly.

The width of the lower positioning plate in the mandrel positioning and releasing assembly is the same as the width of the left template and the right template, so that the positioning accuracy of the mandrel positioning and releasing assembly is further ensured.

The upper locating plate among the plug location release subassembly and the lower locating plate between be equipped with a middle fixed plate at least, the lower extreme position of highly confirming the plug release through middle fixed plate.

Last locating plate and middle locating plate in the plug location release subassembly on be equipped with the bolt and pass the hole, the up end of lower locating plate be equipped with the bolt screw hole that passes the hole same position, the bolt pass hole and threaded hole in be equipped with locking bolt, locking bolt pass the bolt on last locating plate and the middle locating plate in proper order and pass the hole fixed connection with the screw hole on the lower locating plate, and then realize the fixed connection between last locating plate, middle fixed plate and the lower locating plate.

The upper end of the plug fixed block in the plug location release subassembly be equipped with two plug release push rods side by side at least, the lower extreme of plug release push rod be connected with the plug fixed block, the upper end of plug release push rod is through baffle interconnect, the stability of two plug release push rod increase releases.

The fixed plectrum tip of plug that stretches into bottom plate in the plug location release subassembly be equipped with the spacer, the one end of spacer be connected with the fixed plectrum of plug, the other end of spacer is connected with the bottom plate in stretching into the bottom plate, the spacer be the acute angle with the fixed plectrum of plug and be connected, guarantee the connection stability of the fixed plectrum of plug.

Lower bolster among the cylindrical forming die, front bezel, back template, cope match-plate pattern, left template and right template between be connected through connecting boss and connecting groove and form detachable construction.

The utility model discloses because the device comprises cylindrical forming die and plug location release subassembly, cylindrical forming die constitute by lower bolster, front bezel, back template, cope match-plate pattern, left template and right template, cope match-plate pattern and lower bolster around respectively with left template, right template, front bezel and back template interconnect, the up end of lower bolster be equipped with the cross-section and be semicircular bar groove, the lower terminal surface of cope match-plate pattern be equipped with the symmetrical bar groove of bar groove on the lower bolster, the bar groove of front bezel, back template, cope match-plate pattern, the mutual lock of bar groove of lower bolster form the cylinder chamber, plug location release subassembly establish in the lower bolster top, plug location release subassembly by top locating plate, middle fixed plate, bottom plate, plug fixed block, location plug, the fixed plectrum of plug, the plug fixed plectrum, The upper positioning plate, the middle fixing plate and the lower positioning plate are connected with each other in the vertical direction, a strip-shaped groove with openings at the front end and the rear end is arranged in the middle of the lower end face of the lower positioning plate, a core rod fixing block is arranged in the strip-shaped groove, a core rod releasing push rod is arranged at the upper end of the core rod fixing block, the lower end of the core rod releasing push rod is connected with the core rod fixing block, the upper end of the core rod releasing push rod sequentially penetrates through the lower positioning plate, the middle fixing plate and the upper positioning plate to be connected with the baffle plate, a return spring is sleeved on the core rod releasing push rod extending out of the upper positioning plate, the lower end of the return spring is contacted with the upper positioning plate, the upper end of the return spring is contacted with the baffle plate, the core rod releasing push rod is in an upward moving state through the return spring, and, the front end and the rear end of a positioning core rod are respectively contacted with the plate surfaces of a front template and a rear template, the lower positioning plates at the two sides of a strip-shaped groove are respectively provided with a core rod fixing shifting sheet, the upper end of the core rod fixing shifting sheet extends into the lower positioning plates and is fixedly connected with the lower positioning plates, the lower end of the core rod fixing shifting sheet inclines towards the strip-shaped groove and is contacted and clamped with the positioning core rod fixed in an arc-shaped groove so as to fix the positioning core rod, the lower end surface of the upper positioning plate is respectively connected with a left template and a right template in a positioning way, the releasing position of a core rod positioning releasing assembly is fixed through the upper positioning plate, the end section of the semicircular groove of the upper template and the lower template is coincided with the section of the lower template or the upper template, the upper end surfaces of the left template and the right template are provided with strip-shaped bosses, the lower end surface, the positioning of the mandrel positioning and releasing assembly is realized by matching the strip-shaped boss and the strip-shaped connecting groove, the width of a lower positioning plate in the mandrel positioning and releasing assembly is the same as the width of a left template and a right template, the positioning accuracy of the mandrel positioning and releasing assembly is further ensured, at least one middle fixing plate is arranged between an upper positioning plate and the lower positioning plate in the mandrel positioning and releasing assembly, the lower end position of mandrel releasing is determined by the height of the middle fixing plate, bolt through holes are arranged on the upper positioning plate and the middle positioning plate in the mandrel positioning and releasing assembly, a threaded hole with the same position as the bolt through hole is arranged on the upper end surface of the lower positioning plate, locking bolts are arranged in the bolt through holes and the threaded holes, the locking bolts sequentially pass through the bolt through holes on the upper positioning plate and the middle positioning plate and, the upper positioning plate, the middle fixing plate and the lower positioning plate are fixedly connected, at least two mandrel releasing push rods are arranged at the upper end of a mandrel fixing block in the mandrel positioning and releasing assembly in parallel, the lower ends of the mandrel releasing push rods are connected with the mandrel fixing block, the upper ends of the mandrel releasing push rods are connected with each other through a baffle, the two mandrel releasing push rods increase the releasing stability, a positioning piece is arranged at the end part of a mandrel fixing shifting piece, extending into the lower positioning plate, in the mandrel positioning and releasing assembly, of the mandrel fixing shifting piece, one end of the positioning piece is connected with the mandrel fixing shifting piece, the other end of the positioning piece extends into the lower positioning plate and is connected with the lower positioning plate, the positioning piece is connected with the mandrel fixing shifting piece in an acute angle, the connecting stability of the mandrel fixing shifting piece is guaranteed, and the lower template, the front template, the rear template, The left template and the right template are connected through the connecting bosses and the connecting grooves to form a detachable structure, and the pressing mechanism has the advantages of simple structure, good pressing effect, high production efficiency, low production cost and the like.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a front cross-sectional view of the mandrel positioning and releasing assembly of the present invention.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

as shown in the attached drawings, the hollow cylindrical neodymium iron boron green compact forming device is characterized by comprising a cylindrical forming die and a mandrel positioning and releasing component, wherein the cylindrical forming die comprises a lower template 1, a front template, a rear template, an upper template, a left template 2 and a right template 3, the peripheries of the upper template and the lower template 1 are respectively connected with the left template 2, the right template 3, the front template and the rear template mutually, a strip-shaped groove 4 with a semicircular cross section is arranged on the upper end surface of the lower template 1, a strip-shaped groove 4 symmetrical to the strip-shaped groove on the lower template 1 is arranged on the lower end surface of the upper template, the front template, the rear template, the strip-shaped groove 4 of the upper template and the strip-shaped groove 4 of the lower template 1 are mutually buckled to form a cylindrical cavity, the mandrel positioning and releasing component is arranged above the lower template 1, and the mandrel positioning and releasing component is composed of an upper positioning plate 5, The upper positioning plate 5, the middle positioning plate 6 and the lower positioning plate 7 are connected with each other in a vertical direction, a strip-shaped groove with openings at the front end and the rear end is arranged in the middle of the lower end surface of the lower positioning plate 7, the mandrel fixing block 8 is arranged in the strip-shaped groove, the mandrel releasing push rod 11 is arranged at the upper end of the mandrel fixing block 8, the lower end of the mandrel releasing push rod 11 is connected with the mandrel fixing block 8, the upper end of the mandrel releasing push rod 11 sequentially penetrates through the lower positioning plate 7, the middle positioning plate 6 and the upper positioning plate 5 to be connected with the baffle 12, the resetting spring 13 is sleeved on the mandrel releasing push rod 11 extending out of the upper positioning plate 5, and the lower end of the resetting spring 13 is contacted with the upper positioning plate 5, the upper end of a reset spring 13 contacts with a baffle 12, a mandrel release push rod 11 is in an upward moving state through the reset spring 13, the lower end surface of a mandrel fixing block 8 is provided with arc-shaped grooves with openings at the front end and the rear end which are matched with a positioning mandrel 9, the front end and the rear end of the positioning mandrel 9 are respectively contacted with the surfaces of a front template and a rear template, the lower positioning plates 7 at the two sides of the strip-shaped groove are respectively provided with a mandrel fixing shifting piece 10, the upper end of the mandrel fixing shifting piece 10 extends into the lower positioning plate 7 to be fixedly connected with the lower positioning plate 7, the lower end of the mandrel fixing shifting piece 10 inclines towards the strip-shaped groove and is contacted and clamped with the positioning mandrel 9 fixed in the arc-shaped grooves to further fix the positioning mandrel 9, the lower end surface of an upper positioning plate 5 is respectively connected with a left template 2 and a right template 3 in a positioning, the end section of the semicircular groove of the upper template and the lower template 1 coincides with the section of the lower template 1 or the upper template, the upper end surface of the left template 2 and the right template 3 is provided with a strip-shaped boss 16, the lower end surface of the upper positioning plate 5 in the mandrel positioning and releasing component is provided with a strip-shaped connecting groove matched with the strip-shaped boss 16, the positioning of the mandrel positioning and releasing component is realized through the matching of the strip-shaped boss 16 and the strip-shaped connecting groove, the width of the lower positioning plate 7 in the mandrel positioning and releasing component is the same as the width of the left template 2 and the right template 3, the positioning accuracy of the mandrel positioning and releasing component is further ensured, at least one middle fixing plate 6 is arranged between the upper positioning plate 5 and the lower positioning plate 7 in the mandrel positioning and releasing component, the lower end position of the mandrel releasing is determined through the height of the middle fixing plate 6, and the bolt through holes are arranged on the upper positioning plate, the upper end face of the lower positioning plate 7 is provided with a threaded hole which has the same position as the bolt passing hole, locking bolts 14 are arranged in the bolt passing hole and the threaded hole, the locking bolts 14 sequentially pass through the bolt passing holes on the upper positioning plate 5 and the middle positioning plate and are fixedly connected with the threaded holes on the lower positioning plate 7, so that the fixed connection among the upper positioning plate 5, the middle fixing plate 6 and the lower positioning plate 7 is realized, the upper end of a core rod fixing block 8 in the core rod positioning and releasing assembly is at least provided with two core rod releasing push rods 11 in parallel, the lower end of the core rod releasing push rod 11 is connected with the core rod fixing block 8, the upper ends of the core rod releasing push rods 11 are mutually connected through a baffle 12, the two core rod releasing push rods 11 increase the releasing stability, and the end part of a core rod fixing shifting piece 10 extending, one end of the positioning piece 15 is connected with the core rod fixing shifting piece 10, the other end of the positioning piece 15 extends into the lower positioning plate 7 and is connected with the lower positioning plate 7, the positioning piece 15 is connected with the core rod fixing shifting piece 10 in an acute angle mode, connection stability of the core rod fixing shifting piece 10 is guaranteed, and the lower template 1, the front template, the rear template, the upper template, the left template 2 and the right template 3 in the cylindrical forming mold are connected through the connecting boss and the connecting groove to form a detachable structure.

When the utility model is used, firstly, the lower template 1, the front template, the rear template, the left template 2 and the right template 3 are assembled into a powder containing cavity, then a half of the original powder is put above the lower template 1 for scraping, then the quantity of the middle fixing plates is calculated according to the position of the releasing and positioning core rod, after the selection is completed, the positioning core rod 9 is arranged on the core rod positioning and releasing component, the core rod releasing push rod 11 is pushed to drive the core rod fixing block 8 to poke the core rod fixing poking sheet 10, the core rod is placed in the arc-shaped groove of the core rod fixing block 8, then under the action of the reset spring 13, the reset spring 13 drives the core rod releasing push rod 11 to move upwards, further drives the core rod fixing block 8 to move upwards into the strip-shaped groove, then the core rod is fixed by the inner shrinkage of the core rod fixing poking sheet 10 and contacting with the positioning core rod 9, after the positioning core rod 9, the upper positioning plate 5 of the core rod positioning and releasing component is, the lower positioning plate 7 extends into the upper part of the lower template 1, then the baffle 12 is pressed, the baffle 12 drives the mandrel release push rod 11 to push the mandrel fixing block 8 to move downwards, the mandrel fixing block 8 pushes the mandrel fixing shifting piece 10 to expand towards the outer side, then the positioning mandrel 9 is released, the positioning mandrel 9 is just released at the middle part of the scraped original powder and at a specific height, then the mandrel positioning and releasing device is taken out, the other half of the original powder is put into the mandrel positioning and releasing device to be scraped, the upper template is put into the mandrel positioning and pressing device to be pressed by the pressing machine, and the preparation of the hollow cylindrical neodymium iron boron product is completed by demoulding after the pressing is completed The upper end surface of the lower template 1 is provided with a strip-shaped groove 4 with a semicircular section, the lower end surface of the upper template is provided with a strip-shaped groove 4 which is symmetrical to the strip-shaped groove on the lower template 1, the strip-shaped grooves 4 of the front template, the rear template, the upper template and the lower template 1 are mutually buckled to form a cylindrical cavity, the mandrel positioning and releasing component is arranged above the lower template 1 and consists of an upper positioning plate 5, a middle fixing plate 6, a lower positioning plate 7, a mandrel fixing block 8, a positioning mandrel 9, a mandrel fixing shifting piece 10, a mandrel releasing push rod 11, a baffle 12 and a reset spring 13, the upper positioning plate 5, the middle fixing plate 6 and the lower positioning plate 7 are mutually connected in the vertical direction, the middle part of the lower end surface of the lower positioning plate 7 is provided with strip-shaped grooves with openings at the front end and the rear end, a mandrel fixing block 8 is arranged in the strip-shaped groove, a mandrel releasing push rod 11 is arranged at the upper end of the mandrel fixing block 8, the lower end of the mandrel releasing push rod 11 is connected with the mandrel fixing block 8, the upper end of the mandrel releasing push rod 11 sequentially passes through a lower positioning plate 7, a middle fixing plate 6 and an upper positioning plate 5 to be connected with a baffle plate 12, a reset spring 13 is sleeved on the mandrel releasing push rod 11 extending out of the upper positioning plate 5, the lower end of the reset spring 13 is contacted with the upper positioning plate 5, the upper end of the reset spring 13 is contacted with the baffle plate 12, the mandrel releasing push rod 11 is in an upward moving state through the reset spring 13, an arc-shaped groove with openings at the front end and the rear end is arranged on the lower end face of the mandrel fixing block 8, the front end and the rear end of the positioning mandrel 9 are respectively contacted with the plate faces of the front template and the rear template, the lower positioning, the upper end of the mandrel fixing shifting piece 10 extends into the lower positioning plate 7 to be fixedly connected with the lower positioning plate 7, the lower end of the mandrel fixing shifting piece 10 inclines towards the strip-shaped groove and is in contact clamping connection with the positioning mandrel 9 fixed in the arc-shaped groove to fix the positioning mandrel 9, the lower end face of the upper positioning plate 5 is respectively in positioning connection with the left template 2 and the right template 3, the release position of the mandrel positioning release assembly is fixed through the upper positioning plate 5, the end section of the semicircular groove of the upper template and the lower template 1 coincides with the section of the lower template 1 or the upper template, the upper end faces of the left template 2 and the right template 3 are provided with strip-shaped bosses 16, the lower end face of the upper positioning plate 5 in the mandrel positioning release assembly is provided with strip-shaped connecting grooves matched with the strip-shaped bosses 16, and the positioning of the mandrel positioning release assembly is realized through the matching of the strip-shaped bosses, the width of the lower positioning plate 7 in the mandrel positioning and releasing assembly is the same as the width of the left template 2 and the right template 3, so that the positioning accuracy of the mandrel positioning and releasing assembly is further ensured, at least one middle fixing plate 6 is arranged between the upper positioning plate 5 and the lower positioning plate 7 in the mandrel positioning and releasing assembly, the lower end position of mandrel releasing is determined by the height of the middle fixing plate 6, the bolt passing holes are formed in the upper positioning plate 5 and the middle positioning plate in the mandrel positioning and releasing assembly, the threaded holes which are the same as the bolt passing holes are formed in the upper end surface of the lower positioning plate 7, locking bolts 14 are arranged in the bolt passing holes and the threaded holes, the locking bolts 14 sequentially pass through the bolt passing holes in the upper positioning plate 5 and the middle positioning plate and are fixedly connected with the threaded holes in the lower positioning plate 7, and, The middle fixing plate 6 is fixedly connected with the lower positioning plate 7, at least two mandrel releasing push rods 11 are arranged at the upper ends of mandrel fixing blocks 8 in the mandrel positioning and releasing assembly in parallel, the lower ends of the mandrel releasing push rods 11 are connected with the mandrel fixing blocks 8, the upper ends of the mandrel releasing push rods 11 are connected with each other through a baffle 12, the two mandrel releasing push rods 11 increase the releasing stability, a positioning piece 15 is arranged at the end part of a mandrel fixing shifting piece 10, extending into the lower positioning plate 7, of the mandrel positioning and releasing assembly, a positioning piece 15 is arranged at the end part of the mandrel fixing shifting piece 10, one end of the positioning piece 15 is connected with the mandrel fixing shifting piece 10, the other end of the positioning piece 15 extends into the lower positioning plate 7 to be connected with the lower positioning plate 7, the positioning piece 15 is connected with the mandrel fixing shifting piece 10 at an acute angle to ensure the connecting stability of the mandrel, The front template, the rear template, the upper template, the left template 2 and the right template 3 are connected through the connecting bosses and the connecting grooves to form a detachable structure, and the die pressing machine has the advantages of simple structure, good pressing effect, high production efficiency, low production cost and the like.

Claims

1. The utility model provides a hollow cylindrical neodymium iron boron pressed compact forming device, its characterized in that the device comprises cylindrical forming die and plug location release subassembly, cylindrical forming die constitute by lower bolster, front bezel, back template, cope match-plate pattern, left template and right template, cope match-plate pattern and lower bolster around respectively with left template, right template, front bezel and back template interconnect, the up end of lower bolster be equipped with the cross-section and be semicircular bar groove, the lower terminal surface of cope match-plate pattern be equipped with the bar groove symmetrical bar groove on the lower bolster, front bezel, back template, the bar groove of cope match-plate pattern, the mutual lock of bar groove of lower bolster form the cylinder chamber, plug location release subassembly establish in the lower bolster top, plug location release subassembly by top locating plate, middle fixed plate, lower locating plate, The upper positioning plate, the middle fixing plate and the lower positioning plate are connected with each other in the vertical direction, the middle part of the lower end face of the lower positioning plate is provided with a strip-shaped groove with openings at the front end and the rear end, the strip-shaped groove is internally provided with the mandrel fixing block, the upper end of the mandrel fixing block is provided with the mandrel releasing push rod, the lower end of the mandrel releasing push rod is connected with the mandrel fixing block, the upper end of the mandrel releasing push rod sequentially passes through the lower positioning plate, the middle fixing plate and the upper positioning plate to be connected with the baffle plate, the mandrel releasing push rod passing through the upper positioning plate is sleeved with a reset spring, the lower end of the reset spring is contacted with the upper positioning plate, the upper end of the reset spring is contacted with the baffle plate, and the mandrel releasing push rod is in an upward moving state through the reset, the lower terminal surface of plug fixed block be equipped with the fixed plug matched with around both ends open-ended arc wall, both ends contact with the face of preceding template and back template respectively around the fixed plug, the lower locating plate of bar groove both sides on be equipped with the fixed plectrum of plug respectively, the fixed plectrum of plug upper end stretch into in the lower locating plate with lower locating plate fixed connection, the lower extreme of the fixed plectrum of plug inclines towards bar groove department and contacts the joint and then fixed positioning plug with the fixed positioning plug in the arc wall, the lower terminal surface of upper locating plate be connected with left template and right template location respectively, fix the release position of plug location release subassembly through the upper locating plate.

2. The forming device of a hollow cylindrical neodymium iron boron compact according to claim 1, characterized in that the end section of the semicircular groove of the upper and lower templates coincides with the section of the lower or upper template.

3. A hollow cylindrical neodymium iron boron green compact forming device according to claim 1, characterized in that the up end of left template and right template be equipped with bar boss, the lower terminal surface of the last locating plate in the plug location release subassembly be equipped with bar boss matched with bar connection groove, cooperate through bar boss and bar connection groove and realize the location of plug location release subassembly.

4. The forming device of a hollow cylindrical neodymium iron boron green compact according to claim 1, characterized in that the width of the lower positioning plate in the mandrel positioning and releasing assembly is the same as the width of the left and right die plates, further ensuring the positioning accuracy of the mandrel positioning and releasing assembly.

5. A hollow cylindrical neodymium iron boron compact forming device according to claim 1, characterized in that at least one middle fixing plate is arranged between the upper positioning plate and the lower positioning plate in the core rod positioning and releasing assembly, and the lower end position of the core rod releasing is determined by the height of the middle fixing plate.

6. A hollow cylindrical neodymium iron boron green compact forming device according to claim 1, characterized in that the bolt passing hole is arranged on the upper positioning plate and the middle positioning plate in the mandrel positioning and releasing component, the upper end face of the lower positioning plate is provided with a threaded hole which is the same as the bolt passing hole, the bolt passing hole and the threaded hole are internally provided with locking bolts, the locking bolts sequentially pass through the bolt passing hole on the upper positioning plate and the middle positioning plate and are fixedly connected with the threaded hole on the lower positioning plate, and then the fixed connection between the upper positioning plate, the middle fixing plate and the lower positioning plate is realized.

7. A hollow cylindrical neodymium iron boron green compact forming device according to claim 1, characterized in that the upper end of the core rod fixing block in the core rod positioning and releasing assembly is provided with at least two core rod releasing push rods in parallel, the lower end of the core rod releasing push rod is connected with the core rod fixing block, the upper ends of the core rod releasing push rods are connected with each other through a baffle, and the two core rod releasing push rods increase the releasing stability.

8. A hollow cylindrical neodymium iron boron green compact forming device according to claim 1, characterized in that the end of the core rod fixing shifting piece which extends into the lower positioning plate in the core rod positioning and releasing assembly is provided with a positioning piece, one end of the positioning piece is connected with the core rod fixing shifting piece, the other end of the positioning piece extends into the lower positioning plate and is connected with the lower positioning plate, and the positioning piece and the core rod fixing shifting piece are connected in an acute angle to ensure the connection stability of the core rod fixing shifting piece.

9. The forming device of a hollow cylindrical neodymium iron boron green compact according to claim 1, characterized in that the lower template, the front template, the rear template, the upper template, the left template and the right template in the cylindrical forming die are connected through the connecting boss and the connecting groove to form a detachable structure.