A molding tool and molding method for a large thin-walled casing wax mold

Abstract

The invention discloses a molding tool and molding method for a large-scale thin-walled receiver wax mold, comprising a base, wherein the middle part of the upper end of the base is fixedly connected to a central axis column, the upper end surface of the base is provided with lower arc rings distributed in a circular array, the outer side of the upper end of the central axis column is provided with upper arc rings distributed in a circular array, the upper end of the central axis column is fixedly connected to a bracket, the middle parts of the lower arc ring and the upper arc ring are respectively slidably connected to the base and the bracket and are fixed by locating pins, the outer side walls of the upper arc ring and the lower arc ring are respectively fitted with the inner side walls of the upper flange and the lower flange of the receiver, and the outer side walls of the upper flange and the lower flange of the receiver are sleeved with elastic bands; the invention places the assembled receiver wax mold on the tool for molding, can control the plane, diameter, roundness and coaxiality of the receiver wax mold, ensures the roundness and coaxiality of the upper and lower flanges of the receiver wax mold, makes the receiver wax mold size consistent, improves the wax mold accuracy, and improves the stability of the receiver wax mold.

Description

Technical Field

[0001] The invention relates to the technical field of investment casting, and in particular to a molding tool and a molding method for a large thin-walled casing wax mold. Background Art

[0002] In order to obtain a casing casting of qualified size, it is necessary to ensure that the inner and outer diameters of the upper and lower flanges have good roundness and coaxiality, and reduce the ellipse caused by the deformation of the flange. To this end, it is necessary to control the deformation of the upper and lower flanges of the casing wax mold. The existing shaping tooling uses separate upper and lower aluminum shaping rings to control the diameter of the flange. The shaping ring is very easy to deform during the processing process, and the accuracy of the shaping ring cannot be guaranteed, resulting in poor roundness of the flange diameter; the separate shaping rings shape the upper and lower flanges separately, and cannot take into account the coaxiality of the two flange circles. Summary of the invention

[0003] The main purpose of the present invention is to provide a molding tool and molding method for a large thin-walled receiver wax model. The assembled receiver wax model is placed on the tool for molding, and the plane, diameter, roundness and coaxiality of the receiver wax model can be controlled, thereby ensuring the roundness and coaxiality of the upper and lower flanges of the receiver wax model, making the receiver wax model consistent in size, improving the accuracy of the wax model, and improving the stability of the receiver wax model, which can effectively solve the problems in the background technology.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a molding tool for a large thin-walled receiver wax model, comprising a base, the middle part of the upper end of the base is fixedly connected to the central axis column, the upper end surface of the base is provided with lower arc rings distributed in a circular array, the outer side of the upper end of the central axis column is provided with upper arc rings distributed in a circular array, the upper end of the central axis column is fixedly connected to a bracket, the middle parts of the lower arc ring and the upper arc ring are respectively slidably connected to the base and the bracket and fixed by locating pins, the outer side walls of the upper arc ring and the lower arc ring are respectively fitted with the inner side walls of the upper flange and the lower flange of the receiver, and the outer side walls of the upper flange and the lower flange of the receiver are sleeved with elastic bands.

[0005] Preferably, the upper arc ring and the lower arc ring have the same structure and are both composed of an arc rod, transverse reinforcement ribs and longitudinal reinforcement ribs connected together. The transverse reinforcement ribs are connected to both ends of the arc rod, and the longitudinal reinforcement ribs are connected to the middle part of the transverse reinforcement ribs and the middle part of the inner ring of the arc rod.

[0006] Preferably, the upper end surfaces of the base and the bracket are embedded with slide rails distributed in a circular array with the axis of the central axis column as the center, the center line of the sliding direction of the slide rail and the axis of the central axis column are located in the same plane, the slide rail is slidably connected to a slider, and the slider is fixedly connected to the lower ends of the upper arc ring and the lower arc ring at the connection between the transverse reinforcement ribs and the longitudinal reinforcement ribs, and the middle parts of the upper end surfaces of the upper arc ring and the lower arc ring are fixedly connected to the connecting block, and the positioning pin passes through the connecting block and is plugged into the slide rail.

[0007] Preferably, a pin hole is provided on the upper end surface of the slide rail, and there are multiple pin holes. A supporting positioning block is provided on the upper side of the slide rail, and the positioning pin passes through the supporting positioning block and is plugged into the pin hole.

[0008] Preferably, the bracket is composed of a disc and a suspension rod, there are multiple suspension rods and the number of the suspension rods is consistent with the upper arc ring, the suspension rods are distributed in a circular array around the side wall of the disc and are integrally arranged with the disc, the disc is fixedly connected to the upper end face of the central axis column and the central axis of the disc coincides with the central axis of the central axis column.

[0009] Preferably, the upper arc rings and the lower arc rings are of the same number and are staggered.

[0010] Preferably, the central axis column is a lifting and adjusting column.

[0011] Preferably, the elastic band is a rubber band or an elastic band.

[0012] A method for shaping a large thin-walled casing wax model comprises the following steps:

[0013] Prepare the finalizing tooling according to the receiver drawing, and make the outer wall diameter of the upper arc ring consistent with the inner wall of the upper flange of the receiver, and the outer wall diameter of the lower arc ring consistent with the inner wall of the lower flange of the receiver. After taking the wax model out of the mold, place it on the base, and slide the lower arc ring and the upper arc ring along the slide rail to the size position set on the drawing in sequence. Insert the locating pins to control the internal shrinkage and deformation of the upper and lower flanges of the receiver wax model, and then tighten the outer walls of the upper and lower flanges of the receiver with elastic bands to control the external shrinkage and deformation of the upper and lower flanges of the receiver wax model, and take out the finalized wax model before entering the next process.

[0014] Compared with the traditional technology, the beneficial effects produced by the present invention are as follows: the present invention places the assembled receiver wax model on the tooling for shaping, and can control the plane, diameter, roundness and coaxiality of the receiver wax model, thereby ensuring the roundness and coaxiality of the upper and lower flanges of the receiver wax model, making the receiver wax model size consistent, improving the wax model accuracy, and improving the stability of the receiver wax model. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention;

[0016] Figure 2 It is a three-dimensional schematic diagram of a part of the structure of the present invention;

[0017] Figure 3 It is a three-dimensional schematic diagram of the bracket of the present invention;

[0018] Figure 4 It is a schematic diagram of the casing being shaped by the shaping tool of the present invention.

[0019] In the figure: 1, base; 2, central axis column; 3, lower arc ring; 4, upper arc ring; 5, bracket; 6, positioning pin; 7, casing; 8, elastic band; 9, slide rail; 10, slider; 11, connecting block; 12, pin hole; 13, support positioning block; 14, disc; 15, suspension rod. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0021] Example 1

[0022] like Figure 1-4 As shown, a molding tool for a large thin-walled receiver wax model comprises a base 1, wherein the middle portion of the upper end of the base 1 is fixedly connected to a central axis column 2, the upper end surface of the base 1 is provided with lower arc rings 3 distributed in a circular array, the outer side of the upper end of the central axis column 2 is provided with upper arc rings 4 distributed in a circular array, the upper arc rings 4 and the lower arc rings 3 are both arranged in a circular array along the axis of the central axis column 2, the upper end of the central axis column 2 is fixedly connected to a bracket 5, the middle portions of the lower arc ring 3 and the upper arc ring 4 are respectively slidably connected to the base 1 and the bracket 5 and are fixed by locating pins 6, the outer side walls of the upper arc ring 4 and the lower arc ring 3 are respectively fitted with the inner side walls of the upper flange and the lower flange of the receiver 7, the outer side walls of the upper flange and the lower flange of the receiver 7 are sleeved with elastic bands 8, and the elastic bands 8 are rubber bands or The elastic band is used to form a circular ring structure through the upper arc ring 4 and the lower arc ring 3, respectively, to fit and support the inner walls of the upper and lower flanges of the casing 7, to ensure that the upper and lower flanges do not deform, to control the inner roundness, diameter and coaxiality of the upper and lower flanges of the casing 7, and to fix the outer walls of the upper and lower flanges through the elastic band 8, so as to fix the casing 7 as a whole and prevent it from shaking. In order to control the flatness of the casing 7, the lower arc ring 3 is in a fitted state with the upper end face of the base 1. The thickness of the upper arc ring 4 and the lower arc ring 3 are respectively consistent with the upper flange and the lower flange of the casing 7, so as to determine the plane of the wax model of the casing 7. The upper arc ring 4 and the lower arc ring 3 are processed separately and are combined into a whole ring after splicing, which improves the dimensional accuracy, ensures the roundness of the flange, and is convenient for fixing and positioning through the slide rail 9 and the positioning pin 6.

[0023] In this example, three upper arc rings 4 and three lower arc rings 3 are selected. The upper arc rings 4 and the lower arc rings 3 have the same structure. The size is determined according to the inner diameter of the upper and lower flanges of the casing 7. They are both composed of arc rods, transverse reinforcement ribs and longitudinal reinforcement ribs connected as a whole, which is convenient for overall precise casting. The transverse reinforcement ribs are connected to the two ends of the arc rods, and the longitudinal reinforcement ribs are connected to the middle part of the transverse reinforcement ribs and the middle part of the inner ring of the arc rods, which ensures the overall strength of the upper arc rings 4 and the lower arc rings 3, avoids deformation of the arc rods, and ensures the roundness of the upper and lower flanges of the casing 7.

[0024] The upper end surfaces of the base 1 and the bracket 5 are embedded with a slide rail 9 distributed in a circular array with the axis of the central axis column 2 as the center. The center line of the sliding direction of the slide rail 9 is located in the same plane as the axis of the central axis column 2, ensuring that the upper arc ring 4 and the lower arc ring 3 move along the central axis column 2 outward. The slide rail 9 is slidably connected to a slider 10, and the slider 10 is fixedly connected to the lower end of the upper arc ring 4 and the lower arc ring 3 at the connection between the transverse reinforcement rib and the longitudinal reinforcement rib, and the middle of the upper end surface of the upper arc ring 4 and the lower arc ring 3 is A fixed connecting block 11 is provided, and the locating pin 6 passes through the connecting block 11 and is plugged into the slide rail 9. After the upper arc ring 4 and the lower arc ring 3 are moved to fit the inner walls of the upper and lower flanges of the casing 7, the locating pin 6 is inserted to fix it. A pin hole 12 is provided on the upper end surface of the slide rail 9, and the pin hole 12 can be provided, which is convenient for upper and lower flanges of different diameters. A supporting locating block 13 is provided on the upper side of the slide rail 9, and the locating pin 6 passes through the supporting locating block 13 and is plugged into the pin hole 12, so that the locating pin 6 can be inserted into the pin hole 12 of the slide rail 9.

[0025] The bracket 5 is composed of a disc 14 and a suspension rod 15. There are multiple suspension rods 15 and the number is consistent with the upper arc ring 4. The suspension rods 15 are distributed in a circular array around the side wall of the disc 14 and are integrally arranged with the disc 14. The disc 14 is fixedly connected to the upper end surface of the central axis column 2 and the central axis of the disc 14 coincides with the central axis of the central axis column 2. The upper arc rings 4 and the lower arc rings 3 are consistent in number and staggered. The extended suspension rod 15 is used for the embedded slide rails 9, and each slide rail 9 corresponds to an upper arc ring 4. In this example, three upper arc rings 4 and three lower arc rings 3 are selected. By staggering the joints of adjacent upper arc rings 4 and adjacent lower arc rings 3, the cut seams of the upper and lower flanges are prevented from being together, resulting in inward contraction. The central axis column 2 is a lifting and adjusting column, which can be upgraded and adjusted to facilitate the support and positioning of the casing 7 at different heights.

[0026] Example 2

[0027] A method for shaping a large thin-walled casing wax model comprises the following steps:

[0028] According to the drawing of the receiver 7, a shaping tool is prepared, and the outer wall diameter of the upper arc ring 4 is consistent with the inner wall of the upper flange of the receiver 7, and the outer wall diameter of the lower arc ring 3 is consistent with the inner wall of the lower flange of the receiver 7. After the wax model is taken out of the mold, it is placed on the base 1, and the lower arc ring and the upper arc ring 4 are slid along the slide rail 9 to the size position set in the drawing in sequence, and the positioning pin 6 is inserted to control the internal shrinkage and deformation of the upper flange and the lower flange of the wax model of the receiver 7, and then the outer wall of the upper flange and the lower flange of the receiver 7 is tightened by the elastic band 8 to control the external shrinkage and deformation of the upper flange and the lower flange of the wax model of the receiver 7. Before entering the next process, the shaped wax model is taken out, and the assembled receiver wax model is placed on the tooling for shaping, which can control the plane, diameter, roundness and coaxiality of the receiver wax model. The outer walls of the upper and lower flanges of the receiver wax model are tightened by the elastic band to control the deformation of the outer diameters of the upper and lower flanges, thereby ensuring the roundness and coaxiality of the receiver wax model, making the size of the receiver wax model consistent, and improving the stability of the receiver wax model.

[0029] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A molding tool for a large thin-walled casing wax model, comprising a base, characterized in that: The middle part of the upper end of the base is fixedly connected to the central axis column, the upper end surface of the base is provided with lower arc rings distributed in a circular array, the outer side of the upper end of the central axis column is provided with upper arc rings distributed in a circular array, the upper end of the central axis column is fixedly connected to the bracket, the middle part of the lower arc ring and the base and the middle part of the upper arc ring and the bracket are both slidably connected and fixed by locating pins, the outer side walls of the upper arc ring and the lower arc ring are respectively fitted with the inner side walls of the upper flange and the lower flange of the casing, the outer side walls of the upper flange and the lower flange of the casing are sleeved with elastic bands, the upper arc ring and the lower arc ring have the same structure, and are both composed of an arc rod, a transverse reinforcing rib and a longitudinal reinforcing rib connected as a whole, the transverse reinforcing rib is connected to the two ends of the arc rod The longitudinal reinforcement ribs are connected with the middle part of the transverse reinforcement ribs and the middle part of the inner ring of the arc rod, the upper end surfaces of the base and the bracket are embedded with slide rails distributed in a circular array with the axis of the central axis column as the center, the center line of the sliding direction of the slide rail and the axis of the central axis column are located in the same plane, the slide rail is slidably connected to the slider, the slider is fixedly connected to the lower ends of the upper arc ring and the lower arc ring at the connection between the transverse reinforcement ribs and the longitudinal reinforcement ribs, and the middle parts of the upper end surfaces of the upper arc ring and the lower arc ring are fixedly connected to the connecting block, the positioning pin passes through the connecting block and is plugged into the slide rail, the upper end surface of the slide rail is provided with a pin hole, and there are multiple pin holes, and a support positioning block is provided on the upper side of the slide rail, and the positioning pin passes through the support positioning block and is plugged into the pin hole.

2. The molding tool for a large thin-walled casing wax mold according to claim 1 is characterized in that: The bracket consists of a disc and a suspension rod. There are multiple suspension rods and the number of the suspension rods is consistent with the upper arc ring. The suspension rods are distributed in a circular array around the side wall of the disc and are integrally arranged with the disc. The disc is fixedly connected to the upper end face of the central axis column and the central axis of the disc coincides with the central axis of the central axis column.

3. The molding tool for a large thin-walled casing wax mold according to claim 2 is characterized in that: The upper arc rings and the lower arc rings are identical in number and are staggered.

4. The molding tool for a large thin-walled casing wax model according to claim 1 is characterized in that: The central axis column is a lifting and lowering adjustment column.

5. The molding tool for a large thin-walled casing wax model according to claim 1 is characterized in that: The elastic band is a rubber band or an elastic band.

6. A shaping method based on the shaping tooling of the large thin-walled casing wax model according to any one of claims 1 to 5, characterized in that: The steps include: Prepare the finalized tooling according to the casing drawing, so that the diameter of the outer wall of the upper arc ring is consistent with the inner wall of the upper flange of the casing, and the diameter of the outer wall of the lower arc ring is consistent with the inner wall of the lower flange of the casing; Take the wax model out of the mold and put it on the base. Slide the lower arc ring and the upper arc ring along the slide rail to the size position set on the drawing in sequence, and insert the positioning pin; The outer side walls of the upper and lower flanges of the receiver are tightened by elastic bands, and the finalized wax mold is removed before entering the next process.

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