CN219025841U - Wax mould for investment casting of dry type screw vacuum pump rotor - Google Patents

Abstract

A wax pattern for investment casting of a dry type screw vacuum pump rotor belongs to the technical field of investment casting. The method is characterized in that: the casting mold comprises a wax mold body, a casting gate molding column and a riser molding block, wherein the casting gate molding column and the riser molding block are fixedly connected with the wax mold body, the casting gate molding column is axially arranged along the wax mold body, one end of the casting gate molding column is fixedly connected with one end of the wax mold body, the other end of the casting gate molding column is higher than the wax mold body, and the riser molding block is fixedly connected with the other end of the wax mold body. According to the utility model, the rotor realizes vertical pouring, during pouring, molten iron enters the cavity from the bottom of the cavity, gas in the cavity is discharged through the riser at the top, and the ceramic die manufactured by the wax die for investment casting of the dry screw vacuum pump rotor can ensure smooth exhaust during pouring, so that the whole cavity can be filled with molten iron, the molten iron gradually flows upwards along the spiral cavity, impurities can be flushed to the riser, the rotor forming effect is good, and the rotor forming quality is uniform.

Description

Wax mould for investment casting of dry type screw vacuum pump rotor

Technical Field

A wax pattern for investment casting of a dry type screw vacuum pump rotor belongs to the technical field of investment casting.

Background

The investment casting is also called lost wax casting, and comprises the procedures of wax pressing, wax repairing, tree assembling, slurry dipping, wax melting, molten metal casting, post treatment and the like. Lost wax casting is to make a wax pattern of the part to be cast from wax, and then coat the wax pattern with slurry, which is the mud pattern. And (5) after the clay mould is dried, putting the clay mould into hot water to melt the internal wax mould. And taking out the clay mould after the wax mould is melted, and then baking the clay mould into a ceramic mould. And (5) roasting. In general, a pouring hole is left when the mud is made, molten metal is poured into the pouring hole, and after cooling, the required part is made.

In casting a rotor of a dry screw vacuum pump by lost wax casting, it is necessary to produce a wax pattern and then form a ceramic mold by the wax pattern. However, the dry screw vacuum pump rotor is spiral, the shape is complex, the problem of insufficient filling caused by unsmooth exhaust is easy to occur, and the volume is reduced due to shrinkage or cooling of molten iron, so that the problem that the size of castings is smaller than the specified size due to cooling of molten iron is easy to occur in the current lost-wax casting mode.

Disclosure of Invention

The utility model aims to solve the technical problems that: the wax mould for investment casting of the dry screw vacuum pump rotor overcomes the defects of the prior art, and can ensure smooth exhaust during casting, thereby ensuring good rotor molding effect after casting.

The technical scheme adopted for solving the technical problems is as follows: the wax pattern for investment casting of the dry screw vacuum pump rotor is characterized in that: the casting mold comprises a wax mold body, a casting gate molding column and a riser molding block, wherein the casting gate molding column and the riser molding block are fixedly connected with the wax mold body, the casting gate molding column is axially arranged along the wax mold body, one end of the casting gate molding column is fixedly connected with one end of the wax mold body, the other end of the casting gate molding column is higher than the wax mold body, and the riser molding block is fixedly connected with the other end of the wax mold body.

Preferably, the pouring gate molding column comprises a main pouring gate molding column and a communication channel molding column, wherein the main pouring gate molding column is parallel to the wax pattern main body, one end of the communication channel molding column is fixedly connected with one end corresponding to the main pouring gate molding column, and the other end of the communication channel molding column is fixedly connected with one corresponding end of the wax pattern main body.

Preferably, the wax mould further comprises a branch pouring gate molding column, one end of the branch pouring gate molding column is fixedly connected with the pouring gate molding column, and the other end of the branch pouring gate molding column is fixedly connected with the wax mould main body.

Preferably, the split runner molding columns are arranged at intervals along the wax pattern main body.

Preferably, the device also comprises a blind riser forming block which is fixedly connected with the middle part of the wax mould main body.

Preferably, the blind riser forming blocks are arranged in a plurality of ways along the axial direction of the wax mould main body at intervals.

Preferably, the blind riser forming blocks and the pouring gate forming columns are arranged on two opposite sides of the wax mould main body.

Preferably, the blind riser forming blocks are arranged at intervals along the circumferential direction of the wax pattern body.

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

this dry-type screw vacuum pump rotor's wax matrix's of investment casting wax matrix main part one end and runner shaping post fixed connection, the other end and riser shaping piece fixed connection, and runner shaping post sets up along the axial of wax matrix main part, make the rotor realize vertical pouring, when pouring, molten iron enters into the die cavity by the bottom of die cavity, the gas in the die cavity is discharged through the riser at top, the ceramic mould of investment casting wax matrix preparation through this dry-type screw vacuum pump rotor can guarantee that the exhaust is unobstructed when pouring, and then guarantee that molten iron can be full of whole die cavity, and molten iron upwards flows gradually along helical die cavity, can dash impurity riser department, guarantee that the shaping effect of rotor is good, and shaping quality is even.

Drawings

FIG. 1 is a schematic perspective view of an investment cast wax pattern for a dry screw vacuum pump rotor.

FIG. 2 is a schematic front view of an investment cast wax pattern of a dry screw vacuum pump rotor.

In the figure: 1. the device comprises a wax mould main body 2, a main pouring gate molding column 3, a blind riser molding block 4, a riser molding block 5, a communication channel molding column 6 and a branch pouring gate molding column.

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. 1-2 are diagrams illustrating a preferred embodiment of the present utility model, and the present utility model is further described with reference to fig. 1-2.

The utility model provides a dry-type screw vacuum pump rotor's investment casting's wax matrix, includes wax matrix main part 1 and with wax matrix main part 1 fixed connection's runner shaping post and riser shaping piece 4, runner shaping post sets up along the axial of wax matrix main part 1, runner shaping post's one end and wax matrix main part 1's one end fixed connection, the other end is higher than wax matrix main part 1 setting, riser shaping piece 4 and wax matrix main part 1's the other end fixed connection. This dry-type screw vacuum pump rotor's wax matrix main part 1 one end and runner shaping post fixed connection, the other end and riser shaping piece 4 fixed connection, and runner shaping post sets up along the axial of wax matrix main part 1, make the rotor realize vertical pouring, when pouring, molten iron enters into the die cavity by the bottom of die cavity, the gas in the die cavity is discharged through the riser at top, the ceramic mould of the investment casting's of this dry-type screw vacuum pump rotor preparation can guarantee that the exhaust is unobstructed when pouring, and then guarantee that molten iron can be full of whole die cavity, and molten iron upwards flows along helical die cavity gradually, can dash impurity riser department, guarantee that the shaping of rotor is effectual, and shaping quality is even.

Specific: as shown in fig. 1-2: the wax mould main body 1 is vertically arranged in a spiral shape, and the pitch of the wax mould main body 1 is gradually reduced from bottom to top. The riser forming block 4 is cylindrical and coaxially arranged with the wax pattern main body 1, the riser forming block 4 is arranged on the upper side of the wax pattern main body 1, the diameter of the riser forming block 4 is larger than that of a main shaft of the wax pattern main body 1, the bottom of the riser forming block 4 is fixedly connected with the top of the wax pattern main body 1, and a rounding corner is arranged around the bottom of the riser forming block 4.

The pouring gate molding column comprises a main pouring gate molding column 2 and a communication channel molding column 5, wherein the main pouring gate molding column 2 is vertically arranged on one side of the wax pattern main body 1, the main pouring gate molding column 2 is axially arranged along the wax pattern main body 1, the length of the main pouring gate molding column 2 is greater than that of the wax pattern main body 1, the bottom of the main pouring gate molding column 2 is downwards protruded in the wax pattern main body 1, and the top of the main pouring gate molding column 2 is upwards protruded in the riser molding block 4. The communication channel shaping post 5 sets up the downside at wax matrix main part 1 and main runner shaping post 2, and the radial setting of wax matrix main part 1 is followed to communication channel shaping post 5, and the one end and the bottom fixed connection of wax matrix main part 1 of communication channel shaping post 5, the bottom fixed connection of main runner shaping post 2 are followed to the other end.

The main runner molding column 2 can form a main runner on the ceramic mold, and the communication channel molding column 5 can form a communication channel on the ceramic mold, and the communication channel has the function of communicating the bottom of the main runner with the bottom of the cavity formed by the wax mold main body 1. The riser forming block 4 forms a riser at the top of the cavity. When molten iron is poured into the cavity through the main pouring gate, the molten iron enters the cavity from the bottom of the cavity and flows upwards along the spiral cavity, air in the cavity is gradually discharged outwards through the riser, smooth exhaust is ensured, and the molten iron is ensured to fill the whole cavity. Secondly, when the molten iron flows upwards along the spiral cavity, impurities in the molten iron can float on the liquid surface of the molten iron, and after casting is finished, the impurities can enter the riser, so that the rotor forming effect is good, and the quality uniformity of the rotor can be guaranteed.

The wax mould for investment casting of the dry type screw vacuum pump rotor further comprises a split pouring gate forming column 6, wherein the split pouring gate forming column 6 is arranged between the main pouring gate forming column 2 and the wax mould main body 1, the split pouring gate forming column 6 is arranged along the radial direction of the wax mould main body 1, one end of the split pouring gate forming column 6 is fixedly connected with the wax mould main body 1, and the other end of the split pouring gate forming column 6 is fixedly connected with the main pouring gate forming column 2.

Further, a plurality of split runner molding columns 6 are arranged at intervals along the axial direction of the wax pattern body 1, in this embodiment, the split runner molding columns 6 are formed by five split runner molding columns arranged side by side and at intervals along the axial direction of the wax pattern body 1, and one end of each split runner molding column 6, which is close to the wax pattern body 1, is fixedly connected with the outer wall of the wax pattern body 1.

The split runner forming column 6 can form a split runner on the ceramic die, when molten iron is poured into the cavity through the main runner, the molten iron can enter from the bottom of the cavity through the communication channel and can enter from the side of the cavity through the split runner, the molten iron can be ensured to fill the whole cavity rapidly, and the problem of insufficient filling caused by complex shape of the rotor of the dry screw vacuum pump is avoided.

The wax mould for investment casting of the dry type screw vacuum pump rotor further comprises a blind riser forming block 3, wherein the blind riser forming block 3 is fixedly connected with the middle part of the wax mould main body 1. Blind riser forming blocks 3 and main runner forming columns 2 are respectively arranged on two opposite sides of the wax mould main body 1.

Further, the blind riser forming blocks 3 are provided with a plurality of blocks along the axial direction of the wax pattern body 1 at intervals, in this embodiment, the blind riser forming blocks 3 are provided with five blocks along the axial direction of the wax pattern body 1 at intervals, and each blind riser forming block 3 is fixedly connected with the outer wall of the wax pattern body 1.

The blind riser forming block 3 can form a blind riser on the ceramic die, the blind riser is communicated with the cavity, and when molten iron is poured, the molten iron flows into the blind riser. When molten iron is cooled and solidified, the volume of the casting can be reduced, molten iron in the blind riser can be fully fed in the casting cooling process, the cooled casting and the cooled cavity are ensured to be consistent in size, and further the forming size of the casting is ensured to be accurate.

In this embodiment, each blind riser forming block 3 is arranged at intervals in the circumferential direction of the wax pattern body 1, so that not only mutual interference between adjacent blind riser forming blocks 3 can be avoided, but also blind risers can be uniformly distributed in the circumferential direction of the poured rotor, so as to ensure uniform feeding.

The wax mould main body 1, the main pouring gate molding column 2, the blind riser molding block 3, the riser molding block, the communication channel molding column 5 and the branch pouring gate molding column 6 of the wax mould cast by the investment casting of the dry type screw vacuum pump rotor are all made of paraffin. When the wax pattern for investment casting of the dry screw vacuum pump rotor is used, slurry needs to be coated on the outer wall to form a mud pattern, the mud pattern is turned into hot water after being dried, the wax pattern is melted, and the melted wax pattern flows out to form a cavity in the mud pattern. And roasting the clay mold into a ceramic mold, and pouring molten iron.

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 (7)

1. The utility model provides a dry-type screw vacuum pump rotor's investment casting's wax matrix which characterized in that: including wax matrix main part (1) and with wax matrix main part (1) fixed connection's runner shaping post and riser shaping piece (4), the axial setting of wax matrix main part (1) is followed to the runner shaping post, and the one end of runner shaping post and the one end fixed connection of wax matrix main part (1), the other end is higher than wax matrix main part (1) setting, riser shaping piece (4) and the other end fixed connection of wax matrix main part (1).

2. The investment cast wax pattern of a dry screw vacuum pump rotor of claim 1, wherein: the pouring gate molding column comprises a main pouring gate molding column (2) and a communication channel molding column (5), wherein the main pouring gate molding column (2) is parallel to the wax pattern main body (1), one end of the communication channel molding column (5) is fixedly connected with one corresponding end of the main pouring gate molding column (2), and the other end of the communication channel molding column is fixedly connected with one corresponding end of the wax pattern main body (1).

3. The investment cast wax pattern of a dry screw vacuum pump rotor of claim 1 or 2, wherein: the device also comprises a branch pouring gate forming column (6), one end of the branch pouring gate forming column (6) is fixedly connected with the pouring gate forming column, and the other end is fixedly connected with the wax mould main body (1).

4. A dry screw vacuum pump rotor investment cast wax pattern as in claim 3, wherein: the split runner molding columns (6) are arranged at intervals along the wax pattern main body (1).

5. The investment cast wax pattern of a dry screw vacuum pump rotor of claim 1, wherein: the device also comprises a blind riser forming block (3), and the blind riser forming block (3) is fixedly connected with the middle part of the wax mould main body (1).

6. The investment cast wax pattern of a dry screw vacuum pump rotor of claim 5, wherein: the blind riser forming blocks (3) are arranged in a plurality of mode along the axial direction of the wax mould main body (1) at intervals.

7. The investment cast wax pattern of a dry screw vacuum pump rotor of claim 5 or 6, wherein: the blind riser forming blocks (3) and the pouring gate forming columns are arranged on two opposite sides of the wax mould main body (1).

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