CN219004488U

CN219004488U - Resin sand casting metal mold for dry type screw vacuum pump rotor

Info

Publication number: CN219004488U
Application number: CN202223508915.2U
Authority: CN
Inventors: 徐红伟; 刘晓亮; 宫枫峰; 汪明明; 宁廷华
Original assignee: Zibo Water Ring Vacuum Pump Factory Co ltd
Current assignee: Zibo Water Ring Vacuum Pump Factory Co ltd
Priority date: 2022-12-28
Filing date: 2022-12-28
Publication date: 2023-05-12
Anticipated expiration: 2032-12-28

Abstract

A resin sand casting metal mold for a dry type screw vacuum pump rotor belongs to metal mold. An upper forming die is arranged on the upper side of the upper die plate, a lower forming die is arranged on the lower side of the lower die plate, the upper forming die and the lower forming die are surrounded to form a die main body, and positioning opening forming blocks are arranged at two ends of the upper forming die and two ends of the lower forming die; positioning port forming blocks at two ends of each upper forming die are connected with a main shaft forming part of the upper forming die, and the inner ends of the positioning port forming blocks are attached to the end surfaces corresponding to the spiral parts of the upper forming die; the positioning opening forming blocks at two ends of each lower forming die are connected with the main shaft forming part of the lower forming die, and the inner ends of the positioning opening forming blocks are attached to the end surfaces corresponding to the spiral parts of the lower forming die. The locating port forming block can form locating ports at two ends of the cavity to place the core blocks, so that cavities can be formed at two ends of the cast rotor, the effect of removing weight can be achieved, and the removed weight can be reduced during dynamic balance.

Description

Resin sand casting metal mold for dry type screw vacuum pump rotor

Technical Field

A resin sand casting metal mold for a dry type screw vacuum pump rotor belongs to metal mold.

Background

The screw vacuum pump rotor is usually spiral, the screw pitch gradually increases or gradually decreases along the axial direction, and the screw vacuum pump rotor is usually produced in a casting mode during production, namely, a cavity is formed through a sand box, molten iron is poured into the cavity, and the rotor of the screw vacuum pump is formed after the molten iron is cooled.

When forming a cavity in a sand box, a model of a screw vacuum pump is usually required to be manufactured first, and the cavity is formed in the sand box through the model so as to ensure that the cavity is consistent with a rotor of the screw vacuum pump. When the sand mold is manufactured, an upper cavity is formed in the cope flask through the upper forming die, and a lower cavity is formed in the drag flask through the lower forming die, and the upper forming die and the lower forming die can be spliced to form a complete screw vacuum pump rotor model, so that the cope flask and the drag flask can be spliced to form a complete cavity. The common casting mould material is mainly made of red pine wood, and the wood type has the following defects: the wood type surface hardness is low, the wood type surface is easy to deform after collision, and the service life is low.

Secondly, because the screw vacuum pump rotor needs to rotate at a high speed during working, dynamic balance is needed after casting of the screw vacuum pump rotor is completed, and holes are drilled on the outer wall of the screw vacuum pump rotor so as to ensure that the rotor of the screw vacuum pump rotates at a high speed more stably. Moreover, the weight of the existing screw vacuum pump rotor is large, resulting in a large overall weight of the screw vacuum pump, which results in a large weight to be removed when dynamic balancing is performed.

Disclosure of Invention

The utility model aims to solve the technical problems that: the resin sand casting metal mold for the dry screw vacuum pump rotor, which overcomes the defects of the prior art, is provided with the core blocks which are convenient to place, and further forms cavities at the two ends of the cast rotor.

The technical scheme adopted for solving the technical problems is as follows: the resin sand casting metal mold of the dry type screw vacuum pump rotor is characterized in that: the forming die comprises an upper die plate and a lower die plate, wherein an upper forming die is arranged on the upper side of the upper die plate, a lower forming die is arranged on the lower side of the lower die plate, the upper forming die and the lower forming die are surrounded to form a die main body, and positioning opening forming blocks are arranged at two ends of the upper forming die and two ends of the lower forming die;

positioning port forming blocks at two ends of each upper forming die are connected with a main shaft forming part of the upper forming die, and the inner ends of the positioning port forming blocks are attached to the end surfaces corresponding to the spiral parts of the upper forming die; the positioning opening forming blocks at two ends of each lower forming die are connected with the main shaft forming part of the lower forming die, and the inner ends of the positioning opening forming blocks are attached to the end surfaces corresponding to the spiral parts of the lower forming die.

Preferably, the positioning hole forming block is fan-shaped, the positioning hole forming block on the upper forming die is coaxially arranged with the upper forming die, and the positioning hole forming block on the lower forming die is coaxially arranged with the lower forming die.

Preferably, a positioning and forming device is arranged between the upper die plate and the lower die plate.

Preferably, the positioning and forming device comprises positioning column forming holes arranged on the upper template and positioning hole forming columns arranged on the lower template, wherein at least two positioning column forming holes are arranged at intervals, and the positioning hole forming columns correspond to the positioning column forming holes one by one.

Preferably, the diameter of the positioning hole forming column is gradually reduced along the direction away from the lower template, the positioning hole forming column is a blind hole, and the diameter of the positioning hole forming column is gradually increased from inside to outside.

Preferably, three positioning column forming holes are arranged at intervals.

Preferably, the upper forming dies are arranged side by side at intervals, the lower forming dies are in one-to-one correspondence with the upper forming dies, and the spiral directions of the two upper forming dies are opposite.

Preferably, the upper molding die and the lower molding die are both made of metal.

Compared with the prior art, the utility model has the following beneficial effects:

the cope match plate pattern of this dry-type screw vacuum pump rotor's resin sand casting metal mold can cooperate with the cope, forms the die cavity in the cope, and the lower bolster can cooperate with the drag to form the die cavity in the drag, cope and drag concatenation can form complete die cavity, and the locating port shaping piece can form the locating port at the both ends of die cavity, with placing the pellet, and the pellet also is the sand mould of resin sand, thereby can form the cavity at the both ends of cast rotor, can play the effect of removing the heavy, can also reduce the molten iron of consumption, can reduce the weight of getting rid of when doing dynamic balance again.

Drawings

FIG. 1 is a schematic front view of a flask.

FIG. 2 is a schematic perspective view of the lower molding die.

Fig. 3 is a schematic perspective view of the upper molding die.

Fig. 4 is a schematic front view of a pellet.

Fig. 5 is a schematic perspective view of a first core block forming die.

FIG. 6 is a schematic left-hand view of the first core forming die.

FIG. 7 is a schematic cross-sectional view taken in the direction A-A of FIG. 6.

Fig. 8 is a schematic perspective view of a second core block forming die.

FIG. 9 is a schematic top view of a second core forming die.

Fig. 10 is a schematic sectional view in the direction B-B in fig. 9.

In the figure: 1. the molding machine comprises a cope flask 2, a drag flask 3, a positioning hole molding column 4, a lower matchplate 5, a lower molding die 6, a positioning hole molding block 7, an upper matchplate 8, an upper molding die 9, an upper molding block 901, an upper molding block positioning groove 10, a lower molding block 1001, a lower molding block positioning groove 11, a left molding block 1101, a left molding block positioning table 12, a right molding block 1201, a right molding block positioning table 13, a molding mandrel 14, a mounting baseplate 1401, an end positioning plate 1402, an end positioning groove 15, a molding baseplate 1501, a molding baseplate positioning table 16, a molding side plate 1601, a molding side plate positioning table 17, a molding cover 18, a core block 1801, a positioning portion 1802, an interior portion 19, and a positioning column molding hole.

Detailed Description

The present utility model will be further described with reference to specific embodiments, however, it will be appreciated by those skilled in the art that the detailed description herein with reference to the accompanying drawings is for better illustration, and that the utility model is not necessarily limited to such embodiments, but rather is intended to cover various equivalent alternatives or modifications, as may be readily apparent to those skilled in the art.

Fig. 1 to 10 are diagrams illustrating preferred embodiments of the present utility model, and the present utility model is further described below with reference to fig. 1 to 10.

The resin sand casting metal mold of a dry type screw vacuum pump rotor comprises an upper template 7 and a lower template 4, wherein an upper forming die 8 is arranged on the upper side of the upper template 7, a lower forming die 5 is arranged on the lower side of the lower template 4, the upper forming die 8 and the lower forming die 5 are encircled to form a mold main body, and positioning opening forming blocks 6 are arranged at two ends of the upper forming die 8 and two ends of the lower forming die 5; the positioning opening forming blocks 6 at the two ends of each upper forming die 8 are connected with the main shaft forming part of the upper forming die 8, and the inner ends of the positioning opening forming blocks 6 are attached to the end surfaces corresponding to the spiral parts of the upper forming die 8; the positioning hole forming blocks 6 at both ends of each lower forming die 5 are connected to the main shaft forming portion of the lower forming die 5, and the inner ends of the positioning hole forming blocks 6 are bonded to the end faces corresponding to the spiral portions of the lower forming die 5. The cope match plate pattern 7 of this resin sand casting metal mold of dry-type screw vacuum pump rotor can cooperate with cope flask 1, form the upper die cavity from in cope flask 1, lower bolster 4 can cooperate with drag flask 2, thereby form the lower die cavity in drag flask 2, cope flask 1 and drag flask 2 concatenation can form complete die cavity, locating port shaping piece 6 can form the locating port at the both ends of die cavity, in order to place pellet 18, pellet 18 is the sand mould of resin sand too, thereby can form the cavity at the both ends of cast rotor, can play the effect of removing the heavy, can also reduce the molten iron of consumption, again can reduce the weight of getting rid of when doing dynamic balance.

Specific: as shown in fig. 1: the upper sand box 1 can be buckled on the upper side of the lower sand box 2, an upper cavity is arranged in resin sand of the upper sand box 1, and the upper cavity is arranged at the bottom of the upper sand box 1; a lower cavity is provided in the resin sand in the drag flask 2, and the lower cavity is provided at the bottom of the drag flask 2. The cope flask 1 is buckled on the upper side of the drag flask 2, so that the upper cavity and the lower cavity are enclosed into a complete rotor cavity.

The cope flask 1 and the drag flask 2 are conventional, and the structures of the cope flask 1 and the drag flask 2 are not explained here.

As shown in fig. 2: the top of the lower die plate 4 is horizontally arranged and is used for being matched with the lower sand box 2, the top of the lower sand box 4 is provided with a lower forming die 5 and a locating hole forming column 3, the lower forming die 5 is provided with two side by side and spaced, the rotation directions of the two lower forming dies 5 are opposite, and the two lower forming dies 5 are respectively half of a matched pair of screw vacuum pump rotors.

The two ends of each lower forming die 5 are provided with positioning opening forming blocks 6, each positioning opening forming block 6 is in a sector shape coaxial with the corresponding lower forming die 5, each positioning opening forming block 6 is integrally connected with the main shaft forming part of the corresponding lower forming die 5, and the inner end of each positioning opening forming block 6 is connected with the corresponding end face of the spiral part of the corresponding lower forming die 5.

The locating hole shaping post 3 sets up at the top of lower bolster 4, and the lower extreme and the lower bolster 4 fixed connection of locating hole shaping post 3, locating hole shaping post 3 perpendicular to lower bolster 4 set up, and the diameter of locating hole shaping post 3 reduces gradually along the direction of keeping away from lower bolster 4 to it is more convenient to guarantee to fix a position. At least two positioning hole forming columns 3 are arranged at intervals, and in the embodiment, three positioning hole forming columns 3 are arranged at intervals.

In use, the drag flask 2 is snapped over the cope plate pattern 4 and houses the drag mold 5 and the pilot hole molding column 3 therein. The drag flask 2 is then filled with resin sand through the upper portion of the drag flask 2 and compacted to form a lower cavity in the drag flask 2. After the lower cavity is formed, the drag flask 2 is separated from the matchplate 4.

As shown in fig. 3: the top of the cope match plate 7 is horizontally arranged and is used for matching with the cope flask 1, the top of the cope flask 7 is provided with an upper forming die 8 and a positioning column forming hole 19, the upper forming die 8 is provided with two side by side and spaced, the rotation directions of the two upper forming dies 8 are opposite, and the two upper forming dies 8 are respectively half of a matched pair of screw vacuum pump rotors. Each upper molding die 8 and its corresponding lower molding die 5 can be spliced into a complete mold body, and each upper molding die 8 and its corresponding lower molding die 5 are spliced into a pair of mold bodies that are engaged.

The two ends of each upper forming die 8 are provided with positioning opening forming blocks 6, each positioning opening forming block 6 is in a sector shape coaxial with the corresponding upper forming die 8, each positioning opening forming block 6 is integrally connected with the main shaft forming part of the corresponding upper forming die 8, and the inner end of each positioning opening forming block 6 is connected with the corresponding end face of the spiral part of the corresponding upper forming die 8.

The locating column shaping hole 19 is the blind hole that sets up at the top of cope match-plate pattern 7, and the lower extreme and the cope match-plate pattern 7 fixed connection of locating column shaping hole 19, and locating column shaping hole 19 perpendicular to lower bolster 7 sets up, and the diameter of locating column shaping hole 19 increases from inside to outside gradually to guarantee that the location is more convenient. At least two positioning column forming holes 19 are provided at intervals, and in this embodiment, three positioning column forming holes 19 are provided at intervals.

In use, the cope flask 1 is snapped onto the upper side of the cope match plate 7 and houses the cope mold 8 and the positioning column molding holes 19. The cope flask 1 is then filled with resin sand through the upper portion of the cope flask 1 and compacted to form a cope cavity in the cope flask 1. After the upper cavity is formed, the cope flask 1 and the cope match plate 7 are separated.

As shown in fig. 4: after the completion of filling both the cope flask 1 and the drag flask 2, it is necessary to install core blocks 18 at both ends of each of the upper cavity and each of the lower cavity, respectively, to form cavities at both ends of the casting, respectively.

The core block 18 includes a positioning portion 1801 and an internal portion 1802 connected in order, the positioning portion 1801 is a sector shape that mates with a positioning port formed by the corresponding positioning port forming block 6, and the internal portion 1802 is a spiral shape that mates with the butted spiral portion.

The core block 18 is made of resin sand, after the core block 18 is installed, the cope flask 1 and the drag flask 2 are assembled, and meanwhile, positioning columns on the cope flask 1 extend into corresponding positioning holes on the drag flask 2, and at the moment, the upper cavity and the lower cavity matched with the upper cavity are combined into a complete cavity.

After casting of the casting is finished, the resin sand is removed, and cavities can be formed at two ends of the casting respectively, so that the effect of removing weight is achieved, the dosage of molten iron is reduced, and the removal amount of the rotor can be reduced during dynamic balance due to the weight reduction of the whole rotor.

The core block 18 is made from a core block forming die including a first core block forming die and a second core block forming die to form different core blocks 18, respectively.

As shown in fig. 5 to 7: the first core forming die comprises an upper forming block 9, a lower forming block 10, a left forming block 11, a right forming block 12 and a forming mandrel 13, wherein the upper forming block 9 is arranged on the upper side of the lower forming block 10 at intervals, the left forming block 11 and the right forming block 12 are arranged between the upper forming block 9 and the lower forming block 10, the left forming block 11, the right forming block 12, the upper forming block 9 and the lower forming block 10 are surrounded to form a cylindrical inner cavity in the middle, the forming mandrel 13 is arranged in the inner cavity, one end of the forming mandrel 13 is provided with a first axial positioning part forming part, the other end of the forming mandrel 13 is provided with a first spiral-shaped inner part forming part coaxial with the forming mandrel 13, and one end of the first positioning part forming part adjacent to the first inner part forming part is connected to form a first core forming cavity in the inner cavity.

The bottom both ends of each upper shaping piece 9 are provided with an upper shaping piece positioning groove 901, and the top both ends of each lower shaping piece 10 are provided with a lower shaping piece positioning groove 1001. The upper end and the lower extreme of left shaping piece 11 all are provided with left shaping piece positioning table 1101, and the upper left shaping piece positioning table 1101 slidable stretches into in the last shaping piece constant head tank 901 of corresponding side, and the lower left shaping piece positioning table 1101 slidable stretches into in the lower shaping piece constant head tank 1001 of corresponding side. The upper end and the lower extreme of right shaping piece 12 all are provided with right shaping piece positioning table 1201, and the upper right shaping piece positioning table 1201 slidable stretches into in the last shaping piece constant head tank 901 of corresponding side, and the lower right shaping piece positioning table 1201 slidable stretches into in the lower shaping piece constant head tank 1001 of corresponding side.

The first pellet forming cavity is filled with resin sand and compacted to form the pellets 18. The upper forming block 9, the lower forming block 10, the left forming block 11, the right forming block 12 and the forming mandrel 13 are detachably connected, so that the core block 18 is convenient to be demolded.

As shown in fig. 8 to 10: the second core block molding die includes a mounting base plate 14, a molding base plate 15, a molding side plate 16, and a molding cover 17. Both ends of the mounting base plate 14 are provided with protruding end positioning plates 1401, the forming base plate 15 is mounted on the upper side of the mounting base plate 14, the forming base plate 15 is located between the two end positioning plates 1401, both ends of the forming base plate 15 are respectively supported on the inner sides of the end positioning plates 1401 on the corresponding sides, and the two end positioning plates 1401 are matched to position both ends of the forming base plate 15. The middle part of the molding bottom plate 15 is provided with a convex cylindrical core block molding part, the molding cover 17 is sleeved on the upper part of the core block molding part, and two ends of the molding cover 17 are respectively positioned on the end positioning plates 1401 on the corresponding sides. The corresponding central angle of the forming cover 17 is smaller than 180 degrees, so that the demoulding is convenient. The molding side plate 16 is mounted on the upper side of the molding bottom plate 15, the molding side plate 16 is located on one side of the molding cover 17, both ends of the molding side plate 16 are respectively located on the end locating plates 1401 on the corresponding sides, and the molding side plate 16 presses the molding cover 17 against the molding bottom plate 15.

One end of the forming cover 17 is provided with an axial second positioning portion forming portion, and the other end is provided with a spiral second built-in portion forming portion coaxial with the forming cover 17, and the second positioning portion forming portion is connected with one end adjacent to the second built-in portion forming portion so as to form a second core block forming cavity.

Both ends of each end positioning plate 1401 are provided with vertical end positioning grooves 1402, both ends of the forming bottom plate 15 are provided with forming bottom plate positioning tables 1501, the two forming bottom plate positioning tables 1501 are arranged on the same side of the forming bottom plate 15, and each forming bottom plate positioning table 1501 is respectively slidably arranged in the end positioning groove 1402 on the corresponding side.

Both ends of the molding side plate 16 are provided with molding side plate positioning tables 1601, and each molding side plate positioning table 1601 is slidably disposed in the corresponding side end positioning groove 1402.

The second core forming cavity is filled with resin sand and compacted, so that the resin sand is flush with the outer wall of the forming cover 17, and the core 18 is formed.

The application method of the resin sand casting metal mold of the dry type screw vacuum pump rotor comprises the following steps: the different core blocks 18 are produced by either the first core block forming block or the second core block forming block, respectively. A lower cavity is formed in the drag flask 2 by the cooperation of the lower pattern plate 4 and the drag flask 2, an upper cavity is formed in the cope flask 1 by the cooperation of the cope pattern plate 7 and the cope flask 1, and a riser and a runner are provided on the upper cavity.

And respectively placing the manufactured core blocks 18 at two ends of each cavity, then assembling the cope flask 1 and the drag flask 2, and pouring molten iron into the cavities through pouring channels after assembling, thus completing casting of castings.

The above description is only a preferred embodiment of the present utility model, and is not intended to limit the utility model in any way, and any person skilled in the art may make modifications or alterations to the disclosed technical content to the equivalent embodiments. However, any simple modification, equivalent variation and variation of the above embodiments according to the technical substance of the present utility model still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A resin sand casting metal mold of dry-type screw vacuum pump rotor, its characterized in that: the forming die comprises an upper die plate (7) and a lower die plate (4), wherein an upper forming die (8) is arranged on the upper side of the upper die plate (7), a lower forming die (5) is arranged on the lower side of the lower die plate (4), the upper forming die (8) and the lower forming die (5) are surrounded to form a die body, and positioning opening forming blocks (6) are arranged at two ends of the upper forming die (8) and two ends of the lower forming die (5);

positioning opening forming blocks (6) at two ends of each upper forming die (8) are connected with a main shaft forming part of the upper forming die (8), and the inner ends of the positioning opening forming blocks (6) are attached to the end surfaces corresponding to the spiral parts of the upper forming die (8); the positioning opening forming blocks (6) at two ends of each lower forming die (5) are connected with the main shaft forming part of the lower forming die (5), and the inner ends of the positioning opening forming blocks (6) are attached to the end surfaces corresponding to the spiral parts of the lower forming die (5).

2. The resin sand casting metal mold for a dry screw vacuum pump rotor according to claim 1, wherein: the positioning hole forming block (6) is fan-shaped, the positioning hole forming block (6) on the upper forming die (8) and the upper forming die (8) are coaxially arranged, and the positioning hole forming block (6) on the lower forming die (5) and the lower forming die (5) are coaxially arranged.

3. The resin sand casting metal mold for a dry screw vacuum pump rotor according to claim 1, wherein: a positioning and forming device is arranged between the upper die plate (7) and the lower die plate (4).

4. A resin sand casting metal mold for a dry screw vacuum pump rotor according to claim 3, wherein: the positioning and forming device comprises positioning column forming holes (19) formed in the upper die plate (7) and positioning hole forming columns (3) formed in the lower die plate (4), wherein at least two positioning column forming holes (19) are formed at intervals, and the positioning hole forming columns (3) and the positioning column forming holes (19) are in one-to-one correspondence.

5. The resin sand casting metal mold for a dry screw vacuum pump rotor according to claim 4, wherein: the diameter of the positioning hole forming column (3) is gradually reduced along the direction away from the lower die plate (4), the positioning hole forming hole (19) is a blind hole, and the diameter of the positioning hole forming hole (19) is gradually increased from inside to outside.

6. The resin sand casting metal mold for a dry screw vacuum pump rotor according to claim 4, wherein: the positioning column forming holes (19) are arranged at intervals.

7. The resin sand casting metal mold for a dry screw vacuum pump rotor according to claim 1, wherein: the upper forming dies (8) are arranged side by side at intervals, the lower forming dies (5) are in one-to-one correspondence with the upper forming dies (8), and the spiral directions of the two upper forming dies (8) are opposite.

8. The resin sand casting metal mold for a dry screw vacuum pump rotor according to claim 1, wherein: the upper forming die (8) and the lower forming die (5) are both made of metal materials.