CN211515976U - Multi-cavity sand mold forming die for transmission housing - Google Patents

Abstract

The utility model relates to a multi-chamber sand mould forming die of derailleur shell, including the upper die base, shaping template and die holder, the shaping template presss from both sides tightly between upper die base and die holder, the shaping chamber has been opened respectively to the side that upper die base and die holder are relative, the shaping template includes cope match-plate pattern and the lower bolster of laminating each other, fixedly connected with is used for the last core of casing die cavity in the shaping on the cope match-plate pattern, fixedly connected with is used for the lower core of casing die cavity under the shaping on the lower bolster, it has a plurality of sand jets to open respectively on upper die base and the die holder, the cope match-plate pattern is provided with two rows at least on the cope match-plate pattern, be connected with sprue shaping mold core on the cope match-plate pattern, fixedly connected with first runner shaping mold core on the cope match-plate pattern, first runner shaping model is connected in. The utility model discloses can the shaping have a sand mould of a plurality of derailleur housing die cavities, improve the shaping efficiency in sand mould later stage.

Description

Multi-cavity sand mold forming die for transmission housing

Technical Field

The utility model belongs to the technical field of the fashioned technique of sand mould and specifically relates to a multi-chamber sand mould forming die of derailleur shell is related to.

Background

The transmission shell is a shell structure for mounting a transmission mechanism and accessories thereof, and in the prior art, a transmission shell is designed, referring to fig. 1 and 2, the transmission shell comprises an upper shell 51 and a lower shell 52, wherein the upper shell 51 and the lower shell 52 are mutually attached, and the edges of the two attachments are fastened through bolts.

When manufacturing the transmission housing, the transmission housing is usually manufactured by casting due to the complexity of the structure. Casting is a common workpiece processing mode in the prior art, and a sand mold is usually needed when the mode is utilized for processing. The sand mold is formed by compacting molding sand, a cavity matched with the outline shape of the transmission housing is pre-formed in the sand mold, and in the working process, a worker injects molten iron into the molding sand module, and the molten iron is solidified in the cavity to form the transmission housing.

At present, a common sand mold generally comprises an upper mold and a lower mold which are attached to each other, and a cavity matched with the outline shape of a transmission housing is preformed on opposite side surfaces of the upper mold and the lower mold. Although the sand mold can quickly form the transmission shell and is convenient to demold, in the using process, only one cavity matched with the outline shape of the transmission shell is arranged, so that the defect of low production efficiency exists, and the sand mold cannot adapt to mass production.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims at providing a multi-chamber sand mould forming die of derailleur shell can the shaping have the sand mould of a plurality of derailleur shell die cavities, has improved the shaping efficiency in sand mould later stage.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:

a multi-cavity sand mold forming die for a transmission shell comprises an upper die base, a forming template and a lower die base, wherein the forming template is clamped between the upper die base and the lower die base, forming cavities are respectively formed in the opposite side surfaces of the upper die base and the lower die base, the forming template comprises an upper template and a lower template which are mutually attached, an upper core for forming an upper shell cavity is fixedly connected onto the upper template, a lower core for forming a lower shell cavity is fixedly connected onto the lower template, the upper core is positioned in the forming cavity of the upper die base, the lower core is positioned in the forming cavity of the lower die base, a plurality of sand injection ports are respectively formed in the upper die base and the lower die base, at least two rows of upper cores are arranged on the upper template, at least two rows of upper cores are arranged in each row, the number of the lower cores is matched with the number of the upper cores, and a casting port forming mold core is connected onto, the sprue gate forming mold core is perpendicular to the upper mold plate, one end, far away from the upper mold plate, of the sprue gate forming mold core abuts against the cavity bottom of the forming cavity of the upper mold base, a first runner forming mold core is fixedly connected to the upper mold plate, the first runner forming mold cores are respectively connected to the upper mold cores, a second runner forming mold core is fixedly connected to the lower mold plate, the longitudinal projection of the second runner forming mold core is staggered with the first runner forming mold core, and the longitudinal projection of the sprue gate forming mold core is staggered with the second runner forming mold core.

Through adopting above-mentioned technical scheme, when the sand mould of shaping derailleur shell, the staff compresses tightly the shaping template between upper die base and die holder, and the staff utilizes to penetrate the sand equipment and jets into the molding sand in towards the molding cavity after that, and the molding sand is compacted in the molding cavity, forms mould and lower mould, receives the restriction of last core and lower core, goes up the die cavity that the membrane formed the casing, and the lower mould forms the die cavity of casing down. The utility model discloses in, be provided with a plurality of upper cores and lower die core on cope match-plate pattern and the lower bolster respectively, consequently its fashioned sand mould also has a plurality of shaping transmission housing's die cavity, in later stage casting process, can be in a plurality of transmission housing of unit interval simultaneous moulding, improved transmission housing's production efficiency, be suitable for batch production.

The present invention may be further configured in a preferred embodiment as: a plurality of air guide hole forming mold cores are fixedly connected to the upper mold plate, the air guide hole forming mold cores are perpendicular to the upper mold plate, one end, away from the upper mold plate, of each air guide hole forming mold core abuts against the bottom of the cavity of the forming cavity of the upper mold base, and transition pieces are connected between the air guide hole forming mold cores and the upper mold core.

Through adopting above-mentioned technical scheme, air guide hole forming die core can form the air guide hole in the sand mould of derailleur shell, and at later stage casting's in-process, the air guide hole can be dredged the heat that the derailleur shell itself was carried out to the heat, has reduced the possibility that the work piece of production produced the bubble.

The present invention may be further configured in a preferred embodiment as: and a filter tank forming module is fixedly connected between the upper template and the sprue gate forming mold core.

By adopting the technical scheme, the filter tank forming module can form the filter tank in the sand mold of the transmission shell, the filter tank is communicated with the pouring gate, and in the casting process, the filter tank is filled with filter substances, and molten iron passes through the filter substances before entering the cavity, so that the impurity content rate in the molten iron is reduced, and the forming quality of a workpiece is improved.

The present invention may be further configured in a preferred embodiment as: one side of the lower die base, which faces the upper die base, is fixedly connected with a guide column, the guide column is located at the corner of the lower die base, a first guide hole for the guide column to penetrate through is formed in the corner of the forming template, and a second guide hole for the guide column to insert into is formed in the corner of the upper die base.

By adopting the technical scheme, the guide columns improve the alignment precision among the upper die base, the forming template and the lower die base, so that the final sand mold forming quality is improved.

The present invention may be further configured in a preferred embodiment as: the one side of die holder orientation upper die base is opened has the hole of stepping down, the hole of stepping down is located the corner of die holder, the external diameter of guide post is less than the internal diameter in the hole of stepping down, guide post fixed connection is in the hole bottom in the hole of stepping down, the cover is equipped with ejecting pressure spring on the guide post, ejecting pressure spring is less than the hole of stepping down, second guide hole fixedly connected with extrusion sleeve, the external diameter of extrusion sleeve equals the internal diameter in first guide hole and the hole of stepping down respectively mutually, the internal diameter of extrusion sleeve equals the internal diameter of guide post.

Through adopting above-mentioned technical scheme, when the forming die plate compresses tightly between upper die base and die holder, the extrusion sleeve pipe passes and gets into behind the first guiding hole and abdicate the hole in, and the extrusion sleeve pipe is extruded in ejecting pressure spring this moment for ejecting pressure spring has the resilience force. When the die is removed, the resilience force of the ejection pressure spring ejects the extrusion sleeve, so that the convenience of die removal is improved.

The present invention may be further configured in a preferred embodiment as: and one side of the upper mold core, which is deviated from the upper mold plate, is fixedly connected with a residual block.

Through adopting above-mentioned technical scheme, the surplus piece can form the surplus hole in the sand mould of derailleur shell, and in the later stage casting process, the product of casting out can go out one section surplus, and this section surplus plays the effect of protection derailleur shell, has reduced the derailleur shell in the casting process, and the bottom produces the possibility of defect.

The present invention may be further configured in a preferred embodiment as: one side of the allowance block, which is far away from the upper mold core, is fixedly connected with a heat conduction hole forming mold core.

Through adopting above-mentioned technical scheme, the heat conduction hole shaping mold core can form the heat conduction hole in the sand mould of derailleur shell, can dredge the downthehole heat of surplus to this shaping quality of sand mould has further been improved.

The present invention may be further configured in a preferred embodiment as: the edges of the upper mold core, the lower mold core, the first flow passage forming mold core, the second flow passage forming mold core, the transition piece and the filter tank forming module are arranged in a fillet mode.

Through adopting above-mentioned technical scheme, the convenience that the setting up of radius angle made the shaping template deviate from between upper die base and the die holder has reduced border department too sharp-pointed, destroys the possibility of sand mould shape.

To sum up, the utility model discloses a following at least one useful technological effect:

1. the upper template and the lower template are respectively provided with a plurality of upper cores and lower cores, so that the formed sand mold also has a plurality of cavities for forming the transmission shells, and in the later casting process, a plurality of transmission shells can be formed simultaneously in unit time, so that the production efficiency of the transmission shells is improved, and the method is suitable for batch production;

2. when the forming die plate is pressed between the upper die base and the lower die base, the extrusion sleeve penetrates through the first guide hole and then enters the abdicating hole, and the extrusion sleeve is extruded on the ejection pressure spring at the moment, so that the ejection pressure spring has resilience. When the die is removed, the resilience force of the ejection pressure spring ejects the extrusion sleeve, so that the convenience of die removal is improved.

Drawings

Fig. 1 is a schematic structural diagram for embodying a transmission case in the related art.

Fig. 2 is a schematic structural diagram for embodying a transmission case in the related art.

Fig. 3 is a schematic structural diagram for embodying the present invention.

Fig. 4 is an exploded schematic view for embodying the present invention.

Fig. 5 is a structural view showing a connection relationship between the molding board and the upper core.

Fig. 6 is a schematic structural view of the connection relationship between the forming die plate and the lower core.

Fig. 7 is a sectional view for embodying the ejecting pressure spring.

In the figure, 1, an upper die base; 11. a molding cavity; 12. a second guide hole; 2. forming a template; 21. mounting a template; 211. extruding the sleeve; 22. a lower template; 221. a first guide hole; 23. an upper mold core; 24. a lower mold core; 25. a sprue gate molding mold core; 26. a filter tank forming module; 27. a first runner-forming mold core; 28. a second runner-forming mold core; 29. a gas vent forming mold core; 291. a transition piece; 3. a lower die holder; 31. a sand shooting port; 32. a hole of abdication; 33. a guide post; 34. ejecting a pressure spring; 4. a residue block; 41. a heat conduction hole forming mold core; 51. an upper housing; 52. a lower housing.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The utility model discloses a multi-chamber sand mould forming die of derailleur shell refers to fig. 3 and fig. 4, including upper die base 1, shaping template 2 and die holder 3, shaping template 2 presss from both sides tightly between upper die base 1 and die holder 3, and upper die base 1 and the relative side of die holder 3 are opened respectively and are become die cavity 11. The forming template 2 comprises an upper template 21 attached to the upper die base 1 and a lower template 22 attached to the lower die base 3, and the upper template 21 and the lower template 22 are attached to each other.

Referring to fig. 5 and 6, an upper core 23 for forming an upper shell cavity is fixedly connected to the upper mold plate 21, a lower core 24 for forming a lower shell cavity is fixedly connected to the lower mold plate 22, the upper core 23 is located in the forming cavity 11 of the upper mold base 1, and the lower core 24 is located in the forming cavity 11 of the lower mold base 3. A plurality of sand shooting openings 31 are formed in the upper die base 1 and the lower die base 3 respectively, when the transmission shell forming die is in work, the forming die plate 2 is clamped between the upper die base 1 and the lower die base 3, workers shoot molding sand towards the forming cavity 11 through the sand shooting openings 31, the molding sand forms a sand mold in the forming cavity 11 of the upper die base 1 and the lower die base 3 respectively, and through limitation of the upper mold core 23 and the lower mold core 24, a mold cavity capable of forming a transmission shell is formed in the sand mold finally.

Referring to fig. 5 and 6, in order to improve the efficiency of sand production of the transmission case, the upper core 23 is provided with at least two rows of at least two on the upper mold plate 21, and in the present embodiment, the upper core 23 is provided with two rows of three on the upper mold plate 21. The number of lower cores 24 matches the number of upper cores 23. A sprue gate forming mold core 25 is connected to the upper mold plate 21, the sprue gate forming mold core 25 is perpendicular to the upper mold plate 21, and one end of the sprue gate forming mold core 25, which is far away from the upper mold plate 21, abuts against the cavity bottom of the forming cavity 11 of the upper mold base 1. A filter tank forming module 26 is fixedly connected between the sprue molding core 25 and the upper mold plate 21.

Referring to fig. 5 and 6, a first runner core 27 is fixedly coupled to the upper mold plate 21, the first runner molds are respectively coupled to the respective upper cores 23, and a second runner core 28 is fixedly coupled to the lower mold plate 22. The longitudinal projection of the second runner molding core 28 is staggered with the first runner molding model, and the longitudinal projection of the sprue gate molding core 25 is staggered with the second runner molding core 28.

Referring to fig. 5, in the process of forming the sand core, the gate forming mold core 25 can form a gate of a sand mold, the first runner forming mold core 27 and the second runner forming mold core 28 can form a first runner and a second runner of the sand mold, when the sand mold is closed, the first runner and the second runner are communicated, molten iron is injected into the sand mold through the gate by a worker, and the molten iron enters a cavity of the sand mold through the first runner and the second runner, so that the transmission housing is cast and formed.

Referring to fig. 5, in addition, the filter tank forming module 26 can form a filter tank of a sand mold, and during the operation of the sand mold, the filter tank is filled with filter substances, and the filter substances can filter molten iron injected into the sand mold, so that the possibility of impurities entering the cavity is reduced, and the forming quality of a workpiece is improved.

Referring to fig. 5 and 6, the edges of the upper core 23, the lower core 24, the first runner mold core 27, the second runner mold core 28, the transition piece 291, and the filter tank mold block 26 are rounded. The arrangement of the fillet improves the transitional lubricity between the sand mold and the mold, and reduces the possibility of mold sticking of the sand mold during demolding.

Referring to fig. 5, a plurality of air vent forming mold cores 29 are fixedly connected to the upper mold plate 21, the air vent forming mold cores 29 are perpendicular to the upper mold plate 21, four air vent forming mold cores 29 are respectively and uniformly distributed along the circumferential direction of each upper mold core 23, and transition pieces 291 are fixedly connected between the air vent forming mold cores 29 and the upper mold cores 23. The guide hole forming mold core can form air guide holes in a formed sand core, heat can be conducted in the process of pouring molten iron in a sand mold, and forming quality of workpieces is improved.

Referring to fig. 5, a margin block 4 is fixedly connected to a side of the upper core 23 away from the upper mold plate 21, and a heat-conducting hole forming mold core 41 is fixedly connected to a side of the margin block 4 away from the upper core 23. The allowance block 4 can provide redundant parts for the workpiece, and after the pouring is completed, workers can finish the workpiece to obtain a complete workpiece, so that the probability of scrapping between the workpieces is reduced, and the yield is improved. Meanwhile, the heat-conducting hole forming mold core 41 can form heat-radiating holes, so that heat dissipation is facilitated in the process of pouring the allowance block 4, and the forming quality of a workpiece is improved.

Referring to fig. 7, a yielding hole 32 is formed in one surface of the lower die holder 3 facing the upper die holder 1, and the yielding hole 32 is located at a corner of the lower die holder 3. A guide post 33 is coaxially and fixedly connected in the abdicating hole 32, the outer diameter of the guide post is smaller than the inner diameter of the abdicating hole 32, and the guide post 33 is higher than the abdicating hole 32. A first guide hole 221 for the guide column 33 to pass through is formed at the corner of the forming template 2, and a second guide hole 12 for the guide column 33 to insert into is formed at the corner of the upper die holder 1.

Referring to fig. 7, a pushing compression spring 34 is sleeved on the guide post 33, the pushing compression spring 34 is lower than the abdicating hole 32, and an extrusion sleeve 211 is coaxially and fixedly connected to the second guide hole 12. The outer diameter of the pressing sleeve 211 is equal to the inner diameters of the first guide hole 221 and the relief hole 32, respectively, and the inner diameter of the pressing sleeve 211 is equal to the inner diameter of the guide post 33.

Referring to fig. 7, when the upper die holder 1 and the lower die holder 3 are closed, the guide posts 33 penetrate into the extrusion sleeve 211, and meanwhile, the extrusion sleeve 211 penetrates through the first guide holes 221 and the abdicating holes 32 and abuts against the ejection compression springs 34, and the guide posts 33 have a guiding function, so that the alignment accuracy among the upper die holder 1, the forming die plate 2 and the lower die holder 3 is improved. When the upper die holder 1 and the lower die holder 3 are demolded, the restoring force of the ejection pressure spring 34 enables the upper die holder 1 to be ejected more quickly, and convenience in demolding is improved.

The implementation principle of the embodiment is as follows: in the course of the work, the tight upper die base 1 and the die holder 3 of shaping template 2 clamp, and the staff utilizes and penetrates the molding sand in the sand shooting equipment orientation becomes the die cavity 11, and the molding sand is filled in becoming die cavity 11 and is wrapped up in around outside upper core 23 and lower core 24, and when the drawing of patterns, the last mould sand mould of the transmission shell is formed in upper die base 1. The lower mould sand mould of forming the derailleur shell in the die holder 3, at the pouring in-process, go up the mutual lock of mould sand mould and lower mould sand mould, the staff pours into the molten iron into through the sprue gate orientation between mould sand mould and the lower mould sand mould, and the molten iron solidifies in the die cavity between last mould sand mould and the lower mould sand mould to this pouring of accomplishing the derailleur shell.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims (8)

1. The utility model provides a multi-chamber sand mould forming die of derailleur shell, includes upper die base (1), shaping template (2) and die holder (3), shaping template (2) clamp tightly between upper die base (1) and die holder (3), the side that upper die base (1) and die holder (3) are relative is opened respectively has become die cavity (11), shaping template (2) are including cope match-plate pattern (21) and lower bolster (22) of laminating each other, fixedly connected with is used for the last core (23) of shaping upper shell body die cavity on cope match-plate pattern (21), fixedly connected with is used for the lower core (24) of shaping lower shell body die cavity on lower bolster (22), upper core (23) are arranged in becoming die cavity (11) of upper die base (1), lower core (24) are arranged in becoming die cavity (11) of die holder (3), it has a plurality of sand jet orifices (31) to open respectively on upper die base (1) and die holder (3), the method is characterized in that: the upper mold core (23) is provided with at least two rows on the upper mold plate (21), each row is provided with at least two, the number of the lower mold cores (24) is matched with that of the upper mold cores (23), the upper mold plate (21) is connected with a sprue gate molding mold core (25), the sprue gate molding mold core (25) is vertical to the upper mold plate (21), one end of the upper die plate (21) is abutted against the bottom of the molding cavity (11) of the upper die base (1), a first runner forming mold core (27) is fixedly connected to the upper template (21), the first flow passage forming model is respectively connected with each upper core (23), the lower template (22) is fixedly connected with a second flow passage forming core (28), the longitudinal projection of the second runner molding core (28) is staggered with the first runner molding model, the longitudinal projection of the sprue molding core (25) is staggered with the second runner molding core (28).

2. The multi-cavity sand molding die for the transmission housing according to claim 1, characterized in that: a plurality of air vent forming mold cores (29) are fixedly connected to the upper mold plate (21), the air vent forming mold cores (29) are perpendicular to the upper mold plate (21), one end, far away from the upper mold plate (21), of each air vent forming mold core is abutted to the bottom of the forming cavity (11) of the upper mold base (1), and transition pieces (291) are connected between the air vent forming mold cores (29) and the upper mold core (23).

3. The multi-cavity sand molding die for the transmission housing according to claim 2, characterized in that: and a filter tank forming module (26) is fixedly connected between the upper template (21) and the sprue gate forming mold core (25).

4. The multi-cavity sand molding die for the transmission housing according to claim 1, characterized in that: one side fixedly connected with guide post (33) of die holder (3) orientation upper die base (1), guide post (33) are located the corner of die holder (3), open the corner of shaping template (2) has first guiding hole (221) that supply guide post (33) to pass, open the corner of upper die base (1) has and supplies guide post (33) male second guiding hole (12).

5. The multi-cavity sand molding die for the transmission housing according to claim 4, characterized in that: die holder (3) are opened towards the one side of die holder (1) and are had hole (32) of stepping down, hole (32) of stepping down is located the corner of die holder (3), the external diameter of guide post (33) is less than the internal diameter of hole (32) of stepping down, guide post (33) fixed connection is in the hole bottom of hole (32) of stepping down, the cover is equipped with ejecting pressure spring (34) on guide post (33), ejecting pressure spring (34) are less than hole (32) of stepping down, second guide hole (12) fixedly connected with extrusion sleeve (211), the external diameter of extrusion sleeve (211) equals the internal diameter of first guide hole (221) and hole (32) of stepping down respectively, the internal diameter of extrusion sleeve (211) equals the internal diameter of guide post (33).

6. The multi-cavity sand molding die for the transmission housing according to claim 1, characterized in that: and one side of the upper mold core (23) departing from the upper mold plate (21) is fixedly connected with a residue block (4).

7. The multi-cavity sand molding die for the transmission housing according to claim 6, characterized in that: and one surface of the allowance block (4) departing from the upper mold core (23) is fixedly connected with a heat conduction hole forming mold core (41).

8. The multi-cavity sand molding die for the transmission housing according to claim 3, characterized in that: the edge of the upper mold core (23), the lower mold core (24), the first flow channel molding mold core (27), the second flow channel molding mold core (28), the transition piece (291) and the filter tank molding module (26) is in a fillet shape.

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