CN211515976U - Multi-cavity sand moulding mould for transmission housing - Google Patents

Abstract

The utility model relates to a multi-cavity sand mold for a transmission casing, comprising an upper mold seat, a molding template and a lower mold seat, the molding template is clamped between the upper mold seat and the lower mold seat, the upper mold seat and the lower mold seat The opposite sides are respectively provided with forming cavities. The forming template includes an upper template and a lower template that are attached to each other. The upper template is fixedly connected with an upper core for molding the upper shell cavity, and the lower template is fixedly connected with a lower shell mold. The lower core of the cavity, the upper die base and the lower die base are respectively provided with a number of sand injection ports, the upper core is provided with at least two rows on the upper template, the upper template is connected with a casting gate forming core, and the upper template is fixed A first runner forming die core is connected, the first runner forming model is respectively connected to each upper die core, and a second runner forming die core is fixedly connected on the lower template. The utility model can form a sand mold with a plurality of transmission casing cavities, and improves the molding efficiency of the sand mold in the later stage.

Description

Multi-cavity sand moulding mould for transmission housing

technical field

The utility model relates to the technical field of sand molding, in particular to a multi-cavity sand molding die for a transmission casing.

Background technique

The transmission casing is a casing structure for installing the transmission transmission mechanism and its accessories. In the prior art, a transmission casing is designed. Referring to Figures 1 and 2, it includes an upper casing 51 and a lower casing 52. The upper casing The body 51 and the lower casing 52 are attached to each other, and the attached edges are fastened by bolts.

When making the transmission case, it is usually made by casting due to the complexity of its structure. Casting is a relatively common workpiece processing method in the prior art. When using this method for processing, a sand mold is usually required. The sand mold is a mold compacted by molding sand, and its interior is pre-formed with a cavity that matches the outer contour shape of the transmission housing. During the working process, the staff injects molten iron into the molding sand module, and the molten iron is in the cavity. It solidifies inside to form the transmission housing.

At present, a commonly used sand mold usually includes an upper mold and a lower mold that are fitted with each other, and a cavity matching the outer contour shape of the transmission housing is pre-formed on the opposite sides of the two. Although the above-mentioned sand mold can quickly form the transmission casing and is easy to demould, in the process of use, because only a cavity matching the outer contour shape of the transmission casing is provided, there is a shortcoming of low production efficiency and cannot be adapted to large quantities. Production.

Utility model content

Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a multi-cavity sand mold for a transmission casing, which can form a sand mold with multiple transmission casing cavities and improves the later forming efficiency of the sand mold.

The above-mentioned utility model purpose of the present utility model is achieved through the following technical solutions:

A multi-cavity sand molding die for a transmission housing includes an upper die base, a forming template and a lower die base, the forming template is clamped between the upper die base and the lower die base, the upper die base and the lower die base The opposite sides are respectively provided with forming cavities, the forming template includes an upper template and a lower template that are attached to each other, the upper template is fixedly connected with an upper core for forming the upper shell cavity, and the lower template is fixedly connected There is a lower core for molding the cavity of the lower shell, the upper core is located in the molding cavity of the upper mold base, the lower core is located in the molding cavity of the lower mold base, and the upper mold base and the lower mold base are A number of sand injection ports are respectively opened, the upper core is provided with at least two rows on the upper template, and each row is provided with at least two, the number of the lower cores matches the number of the upper cores, the upper A casting gate forming core is connected to the template, the casting nozzle forming core is perpendicular to the upper template, and its end away from the upper template abuts against the cavity bottom of the molding cavity of the upper mold base, and the upper template is fixedly connected with the first flow A channel forming core, the first channel forming model is connected to each upper core respectively, a second channel forming core is fixedly connected to the lower template, and the longitudinal projection of the second channel forming core is the same as that of the first channel forming core. The runner forming models are interlaced, and the longitudinal projection of the sprue forming die core is interlaced with the second runner forming die core.

By adopting the above technical solution, when forming the sand mold of the transmission housing, the worker presses the forming template between the upper die seat and the lower die seat, and then the worker uses the sand injection equipment to inject the molding sand into the molding cavity, and the molding sand is pressed. In the molding cavity, the upper mold and the lower mold are formed, which are restricted by the upper core and the lower core, the upper film forms the cavity of the upper shell, and the lower mold forms the cavity of the lower shell. In the present invention, a plurality of upper cores and lower cores are respectively arranged on the upper template and the lower template, so the sand mold formed by the mold also has a plurality of cavities for forming the transmission casing. A plurality of transmission casings can be formed simultaneously within a certain time, the production efficiency of the transmission casing is improved, and the utility model is suitable for mass production.

In a preferred example of the present invention, it can be further configured as follows: the upper template is fixedly connected with a plurality of air-guiding hole forming cores, the air-guiding hole forming cores are perpendicular to the upper template, and the end away from the upper template abuts against the upper template. A transition piece is connected between the air guide hole forming die core and the upper die core at the cavity bottom of the forming cavity of the die base.

By adopting the above technical solution, the air guide hole forming die core can form air guide holes in the sand mold of the transmission casing, and in the later casting process, the air guide holes can divert the heat of the transmission casing itself, reducing the production of workpieces. Possibility of bubbles.

In a preferred example of the present invention, it can be further configured as follows: a filter groove forming module is fixedly connected between the upper template and the casting gate forming die core.

By adopting the above technical solution, the filter tank forming module can form a filter tank in the sand mold of the transmission housing, and the filter tank is communicated with the pouring port. During the casting process, the filter tank is filled with filter substances, and the molten iron passes through before entering the cavity The filter material reduces the impurity content rate in the molten iron and improves the molding quality of the workpiece.

In a preferred example of the present invention, it can be further configured as follows: the side of the lower die base facing the upper die base is fixedly connected with a guide column, the guide column is located at the corner of the lower die base, and the corner of the forming template is A first guide hole is opened for the guide column to pass through, and a second guide hole for the guide column to be inserted is opened at the corner of the upper die base.

By adopting the above technical solution, the guide column improves the alignment accuracy between the upper die base, the forming template and the lower die base, thereby improving the final sand molding quality.

In a preferred example of the present invention, it can be further configured as follows: a side of the lower die base facing the upper die base is provided with an escape hole, and the escape hole is located at the corner of the lower die base; The diameter is smaller than the inner diameter of the abdication hole, the guide column is fixedly connected to the bottom of the hole, and a push-out compression spring is sleeved on the guide column, and the push-out pressure spring is lower than the escape hole, and the first The two guide holes are fixedly connected with an extrusion sleeve, the outer diameter of the extrusion sleeve is respectively equal to the inner diameter of the first guide hole and the escape hole, and the inner diameter of the extrusion sleeve is equal to the inner diameter of the guide column.

By adopting the above technical solution, when the forming template is pressed between the upper die base and the lower die base, the extrusion sleeve passes through the first guide hole and then enters the abdication hole, and at this time the extrusion sleeve is extruded on the top The compression spring is ejected, so that the ejection compression spring has a resilience. During demolding, the resilient force of the ejecting compression spring pushes out the extrusion sleeve, thereby improving the convenience of demolding.

In a preferred example of the present invention, a margin block can be fixedly connected to the side of the upper core away from the upper template.

By adopting the above technical solution, the allowance block can form a allowance hole in the sand mold of the transmission casing. In the later casting process, the cast product will have an extra allowance, and this allowance can protect the transmission casing. The possibility of defects in the bottom of the transmission casing during the casting process is reduced.

In a preferred example of the present invention, it can be further configured that: the side of the surplus block facing away from the upper core is fixedly connected with a heat-conducting hole forming core.

By adopting the above technical solution, the heat conduction hole forming die core can form heat conduction holes in the sand mold of the transmission casing, and can divert the heat in the surplus holes, thereby further improving the molding quality of the sand mold.

In a preferred example of the present invention, it can be further configured as follows: the upper core, the lower core, the first runner forming die core, the second runner forming die core, the transition piece, and the edge of the filter groove forming module Round corner settings.

By adopting the above technical solution, the setting of the rounded corners makes it easier for the forming template to come out from between the upper die base and the lower die base, and reduces the possibility that the edge is too sharp and damages the shape of the sand mold.

To sum up, the present utility model includes at least one of the following beneficial technical effects:

1. There are multiple upper and lower cores on the upper and lower formwork respectively, so the sand mold formed by the mold also has multiple cavities for forming the transmission casing. In the later casting process, it can be simultaneously Forming multiple transmission casings improves the production efficiency of transmission casings and is suitable for mass production;

2. When the forming template is pressed between the upper die base and the lower die base, the extrusion sleeve passes through the first guide hole and then enters the abdication hole. At this time, the extrusion sleeve is squeezed against the ejector compression spring, Make the ejection compression spring have resilience. During demolding, the resilient force of the ejecting compression spring pushes out the extrusion sleeve, thereby improving the convenience of demolding.

Description of drawings

FIG. 1 is a schematic structural diagram for embodying a transmission housing in the background art.

FIG. 2 is a schematic structural diagram for embodying a transmission housing in the background art.

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

FIG. 4 is an exploded schematic diagram for embodying the present invention.

FIG. 5 is a schematic structural diagram of the connection relationship between the forming template and the upper core.

FIG. 6 is a schematic structural diagram of the connection relationship between the forming template and the lower core.

Fig. 7 is a cross-sectional view for embodying the ejector compression spring.

In the figure, 1, the upper die seat; 11, the molding cavity; 12, the second guide hole; 2, the molding template; 21, the upper template; 211, the extrusion sleeve; 22, the lower template; 221, the first guide hole; 23, upper core; 24, lower core; 25, sprue forming core; 26, filter groove forming module; 27, first runner forming core; 28, second runner forming core; 29, air guide hole Forming core; 291, transition piece; 3, lower die base; 31, sand injection port; 32, give way hole; 33, guide column; 34, ejection compression spring; 4, margin block; 41, heat conduction hole forming mold core; 51, upper shell; 52, lower shell.

Detailed ways

The present utility model will be described in further detail below in conjunction with the accompanying drawings.

The utility model discloses a multi-cavity sand molding die for a transmission casing. Referring to FIG. 3 and FIG. 4 , it includes an upper die base 1 , a forming template 2 and a lower die base 3 , and the forming template 2 is clamped on the upper die base 1 and the lower die base 3 . Between the lower mold bases 3 , the opposite sides of the upper mold base 1 and the lower mold base 3 are respectively provided with molding cavities 11 . The forming die plate 2 includes an upper die plate 21 attached to the upper die base 1 and a lower die plate 22 attached to the lower die set 3 , and the upper die plate 21 and the lower die plate 22 are attached to each other.

5 and 6 , an upper core 23 for forming the cavity of the upper shell is fixedly connected to the upper template 21 , a lower core 24 for forming the cavity of the lower shell is fixedly connected to the lower template 22 , and the upper core 23 The lower core 24 is located in the molding cavity 11 of the upper mold base 1 , and the lower core 24 is located in the molding cavity 11 of the lower mold base 3 . A number of sand injection ports 31 are respectively opened on the upper mold base 1 and the lower mold base 3. During operation, the forming template 2 is clamped between the upper mold base 1 and the lower mold base 3, and the worker passes the sand injection port 31 toward The molding sand is injected into the molding cavity 11, and the molding sand forms sand molds in the molding cavities 11 of the upper mold base 1 and the lower mold base 3 respectively. By the restriction of the upper core 23 and the lower core 24, the sand mold can finally form the transmission housing. cavity.

Referring to FIGS. 5 and 6 , in order to improve the efficiency of sand mold production of the transmission casing, the upper core 23 is provided with at least two rows on the upper template 21 , and each row is provided with at least two. In this embodiment, the upper core 23 is arranged on the upper There are two rows on the template 21, and three cores 23 are arranged on each row. The number of lower cores 24 matches the number of upper cores 23 . A sprue forming die core 25 is connected to the upper die plate 21 . The sprue forming die core 25 is perpendicular to the upper die plate 21 , and its end away from the upper die plate 21 abuts against the cavity bottom of the molding cavity 11 of the upper die base 1 . A filter groove forming module 26 is fixedly connected between the sprue forming die core 25 and the upper die plate 21 .

5 and 6 , a first runner forming mold core 27 is fixedly connected to the upper die plate 21 , the first runner forming molds are respectively connected to each upper core 23 , and a second runner forming die is fixedly connected to the lower die plate 22 Core 28. The longitudinal projection of the second runner forming die core 28 intersects with the first runner forming model, and the longitudinal projection of the sprue forming die core 25 intersects with the second runner forming die core 28 .

5 , in the process of forming the sand core, the sprue forming die core 25 can form the sprue of the sand mold, and the first runner forming die core 27 and the second runner forming die core 28 can form the first runner and the second runner forming die core of the sand mold. Two flow channels, when the sand mold is closed, the first flow channel and the second flow channel are connected. The staff injects molten iron into the sand mold through the pouring port, and the molten iron enters the cavity of the sand mold through the first flow channel and the second flow channel. Realize the casting molding of the transmission housing.

Referring to FIG. 5 , in addition, the filter tank forming module 26 can form a sand filter tank. During the working process of the sand mold, the filter tank is filled with a filter material, and the filter material can filter the molten iron injected into the sand mold, reducing impurities entering the cavity. The possibility of improving the forming quality of the workpiece.

5 and 6 , the edges of the upper core 23 , the lower core 24 , the first runner forming core 27 , the second runner forming core 28 , the transition piece 291 , and the filter groove forming module 26 are rounded. set up. The setting of the rounded corners improves the transition lubricity between the sand mold and the mold, and reduces the possibility of mold sticking in the sand mold during demolding.

Referring to FIG. 5 , a plurality of air hole forming mold cores 29 are fixedly connected to the upper mold plate 21 , the air hole forming mold cores 29 are perpendicular to the upper mold plate 21 , and the air hole forming mold cores 29 are respectively along the circumferential direction of each upper mold core 23 . There are four evenly distributed, and a transition piece 291 is fixedly connected between the air guide hole forming mold core 29 and the upper mold core 23 . The guide hole forming die core can form air guide holes in the formed sand core, and in the process of pouring molten iron in the sand mold, it can divert the heat and improve the forming quality of the workpiece.

Referring to FIG. 5 , a margin block 4 is fixedly connected to the side of the upper core 23 away from the upper template 21 , and a heat conduction hole forming die core 41 is fixedly connected to the side of the margin block 4 away from the upper core 23 . The surplus block 4 can provide redundant parts for the workpiece. After the casting is completed, the staff can obtain a complete workpiece by finishing the workpiece, which reduces the possibility of scrap between workpieces and improves the yield. At the same time, the heat-conducting hole forming die core 41 can form heat-dissipating holes, which helps to dissipate heat during the process of pouring the surplus block 4 and improves the forming quality of the workpiece.

Referring to FIG. 7 , the side of the lower die base 3 facing the upper die base 1 is provided with an escape hole 32 , and the escape hole 32 is located at the corner of the lower die base 3 . A guide post 33 is coaxially and fixedly connected in the escape hole 32 , the outer diameter of which is smaller than the inner diameter of the escape hole 32 , and the guide post 33 is higher than the escape hole 32 . A first guide hole 221 for the guide column 33 to pass through is opened at the corner of the forming template 2 , and a second guide hole 12 for the guide column 33 to be inserted is opened at the corner of the upper die base 1 .

Referring to FIG. 7 , an ejector compression spring 34 is sleeved on the guide column 33 , the ejection compression spring 34 is lower than the escape hole 32 , and the second guide hole 12 is coaxially and fixedly connected with the extrusion sleeve 211 . The outer diameter of the extrusion sleeve 211 is respectively equal to the inner diameter of the first guide hole 221 and the escape hole 32 , and the inner diameter of the extrusion sleeve 211 is equal to the inner diameter of the guide post 33 .

Referring to FIG. 7 , when the upper die base 1 and the lower die base 3 are clamped, the guide post 33 penetrates into the extrusion sleeve 211 , while the extrusion sleeve 211 passes through the first guide hole 221 and the escape hole 32 and The guide post 33 has a guiding function against the push-out compression spring 34 , which improves the alignment accuracy between the upper die base 1 , the forming template 2 and the lower die base 3 . When the upper die base 1 and the lower die base 3 are demolded, the restoring force of the ejecting compression spring 34 makes the ejection of the upper die base 1 faster and improves the convenience of demolding.

The implementation principle of this embodiment is as follows: during the working process, the forming template 2 is clamped between the upper die base 1 and the lower die base 3, the worker uses the sand injection equipment to inject the molding sand into the molding cavity 11, and the molding sand is filled in the molding cavity 11 and wrapped around the upper core 23 and the lower core 24, when demolding, the upper mold base 1 forms the upper mold of the transmission casing. The lower mold base 3 forms the lower mold sand mold of the transmission casing. During the pouring process, the upper mold sand mold and the lower mold sand mold are engaged with each other. The staff pours molten iron between the upper mold sand mold and the lower mold sand mold through the pouring port, and the molten iron is in the upper mold. The cavity between the mold sand mold and the lower mold sand mold is solidified to complete the casting of the transmission housing.

The examples of this specific embodiment are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore: all equivalent changes made according to the structure, shape and principle of the present invention are not It should be covered within the protection scope of the present invention.

Claims (8)

1. A multi-cavity sand molding die for a transmission housing, comprising an upper die base (1), a forming template (2) and a lower die base (3), the forming template (2) being clamped on the upper die base (1) ) and the lower die base (3), the opposite sides of the upper die base (1) and the lower die base (3) are respectively provided with forming cavities (11), and the forming template (2) comprises a an upper mold plate (21) and a lower mold plate (22), the upper mold plate (21) is fixedly connected with an upper core (23) for forming the upper shell cavity, and the lower mold plate (22) is fixedly connected with an upper mold core (23) used for molding The lower core (24) of the cavity of the lower shell, the upper core (23) is located in the molding cavity (11) of the upper die base (1), and the lower core (24) is located in the lower die base (3) In the molding cavity (11) of the upper mold base (1) and the lower mold base (3), a number of sand injection ports (31) are respectively opened, and it is characterized in that: the upper mold core (23) is on the upper mold plate (21) are provided with at least two rows, each row is provided with at least two, the number of the lower cores (24) matches the number of the upper cores (23), and the upper template (21) is connected with A sprue forming die core (25), the sprue forming die core (25) is perpendicular to the upper template (21), and its end away from the upper template (21) abuts against the molding cavity (11) of the upper die base (1) At the bottom of the cavity, the upper template (21) is fixedly connected with a first runner forming core (27), the first runner forming model is respectively connected to each upper core (23), and the lower template (22) A second runner forming die core (28) is fixedly connected to the top, the longitudinal projection of the second runner forming die core (28) is staggered with the first runner forming model, and the sprue forming die core (25) is longitudinally The projection of the second runner forming core (28) is staggered. 2 . The multi-cavity sand molding die for a transmission casing according to claim 1 , wherein a plurality of air hole forming cores ( 29 ) are fixedly connected to the upper template ( 21 ). The core (29) is perpendicular to the upper template (21), and its end away from the upper template (21) abuts against the cavity bottom of the molding cavity (11) of the upper mold base (1). A transition piece (291) is connected between the upper cores (23). 3. The multi-cavity sand molding mold for transmission housing according to claim 2, wherein a filter groove molding module (26) is fixedly connected between the upper template (21) and the sprue molding core (25). ). 4. The multi-cavity sand molding die for a transmission housing according to claim 1, wherein a guide post (33) is fixedly connected to the side of the lower die base (3) facing the upper die base (1), so The guide post (33) is located at the corner of the lower die base (3), and a first guide hole (221) for the guide post (33) to pass through is opened at the corner of the forming template (2). A second guide hole (12) into which the guide column (33) is inserted is opened at the corner of the seat (1). 5. The multi-cavity sand molding die for a transmission casing according to claim 4, characterized in that: the side of the lower die base (3) facing the upper die base (1) is provided with a vacant hole (32), so The abdication hole (32) is located at the corner of the lower die base (3), the outer diameter of the guide post (33) is smaller than the inner diameter of the escape hole (32), and the guide post (33) is fixedly connected to the abdication hole (32). At the bottom of the hole (32), an ejector compression spring (34) is sleeved on the guide post (33), and the ejection compression spring (34) is lower than the abdication hole (32), and the second guide The hole (12) is fixedly connected with an extrusion sleeve (211), and the outer diameter of the extrusion sleeve (211) is respectively equal to the inner diameter of the first guide hole (221) and the escape hole (32). The inner diameter of the pressure sleeve (211) is equal to the inner diameter of the guide column (33). 6 . The multi-cavity sand molding die for a transmission casing according to claim 1 , wherein a margin block ( 4 ) is fixedly connected to the side of the upper core ( 23 ) facing away from the upper template ( 21 ). 7 . 7. The multi-cavity sand molding die for a transmission housing according to claim 6, characterized in that: the side of the surplus block (4) facing away from the upper core (23) is fixedly connected with a heat-conducting hole forming die core (41). ). 8. The multi-cavity sand molding mold for transmission housing according to claim 3, characterized in that: the upper core (23), the lower core (24), the first runner molding core (27), the first The edges of the two-channel forming die core (28), the transition piece (291), and the filter groove forming module (26) are provided with rounded corners.

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