CN113238006A - Mold and method for measuring shrinkage rate of wax material and application - Google Patents
Mold and method for measuring shrinkage rate of wax material and application Download PDFInfo
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- CN113238006A CN113238006A CN202110522358.0A CN202110522358A CN113238006A CN 113238006 A CN113238006 A CN 113238006A CN 202110522358 A CN202110522358 A CN 202110522358A CN 113238006 A CN113238006 A CN 113238006A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
Abstract
The invention provides a mould, a method and application for measuring wax shrinkage, wherein the method comprises the following steps: designing a die for measuring horizontal shrinkage, vertical shrinkage, thickness shrinkage and shrinkage in the directions of the outer ring and the inner ring; injecting the wax material to be measured into a cavity of a designed mold to obtain a wax mold; measuring the wax mould and calculating the shrinkage rate to obtain the different shrinkage rates of the wax material to be measured in multiple directions; the mould comprises a flat plate part cavity used for measuring the shrinkage rate in the horizontal and vertical directions in the flowing direction, a step part cavity used for measuring the shrinkage rate in different thickness directions and a ring part cavity used for measuring the limiting shrinkage rate of an outer ring and the free shrinkage rate of an inner ring, so that a flat plate part wax mould, a step part wax mould and a ring part wax mould are obtained, the shrinkage rates are respectively calculated, and the sizes of different shrinkage rates of wax materials in multiple directions are obtained. When the wax mould is used for mould design, compensation is carried out by adopting different shrinkage rates in different directions, so that the dimensional precision of a mould cavity is improved, the wax mould is successfully designed once, and the cost is saved.
Description
Technical Field
The invention relates to the field of precision investment casting, in particular to a mold and a method for measuring wax shrinkage and application of the mold and the method.
Background
Investment casting is a precision casting method, and the casting obtained by the method has the advantages of high dimensional precision, high surface quality, less machining and the like, and is a net forming process. The wax pattern preparation is the first major procedure in investment casting, the quality of the prepared wax pattern directly influences the quality of a final casting, and the size of the shrinkage rate has an inseparable relation with the dimensional accuracy of wax pattern forming and the tendency of a shell to expand by heating during dewaxing, so the shrinkage rate is an important performance index of the wax material.
In the traditional wax mould preparation process, the mould design of the wax mould is accumulated according to the past experience of a mould design center to compensate the shrinkage rate of the wax mould, the compensation adopts the same shrinkage rate in all directions, the size of the prepared wax mould is ultra-poor, the size precision of the wax mould is improved by continuously and repeatedly repairing the mould and even re-manufacturing the mould in the later period, and the method consumes a large amount of time and materials, so the cost is increased.
Through search, the Chinese patent with the publication number of CN208721597U discloses a sample mold for measuring wax shrinkage rate, which is suitable for a turbine wax mold and comprises an upper template, an upper mold core, a lower mold core and a lower template which are sequentially arranged from top to bottom, wherein a sample cavity is arranged in the upper mold core, and the sample cavity comprises a layer circular truncated cone cavity positioned in the same circle center; however, the shrinkage rate in the outer ring and inner ring directions cannot be measured by using the mold, the dimension of the prepared wax mold is also out of tolerance, and the shrinkage rate in the different thickness and different diameter directions measured by the mold is only suitable for the wax mold in the shape of a turbine and is not wide.
Therefore, how to design a mold and a method for measuring the shrinkage rate of wax materials can obtain the shrinkage rates of the wax materials in different directions, so that the mold can be compensated for once according to the shrinkage rates in all directions in the mold design, and the problem to be solved at present is solved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a mold, a method and application for measuring the shrinkage rate of wax materials.
The invention provides a method for measuring shrinkage of wax material, which comprises the following steps:
designing a die for measuring horizontal, vertical and thickness and shrinkage in the directions of the outer ring and the inner ring;
injecting the wax material to be measured into a cavity of a designed mold to obtain a wax mold;
and measuring the obtained wax mold and calculating the shrinkage rate to obtain the different shrinkage rates of the wax material to be measured in multiple directions.
Preferably, the mold designed to measure horizontal, vertical, thickness and shrinkage in the outer and inner ring directions, wherein the mold comprises:
the flat piece die is used for measuring the shrinkage rate in the horizontal direction and the vertical direction of the flow direction;
the stepped part die is used for measuring shrinkage rates in different thickness directions;
and the ring die is used for measuring the limiting shrinkage rate of the outer ring and the free shrinkage rate of the inner ring.
Preferably, the wax material to be measured is injected into a cavity of the flat plate piece mold to obtain a flat plate piece wax mold, and the shrinkage rate of the wax material to be measured in the horizontal direction and the vertical direction in the flowing direction is calculated according to the size change of the length, the width and the height of the flat plate piece wax mold.
Preferably, the wax material to be measured is injected into a cavity of the stepped part mold to obtain a stepped part wax mold, and the shrinkage rate of the wax material to be measured in different thickness directions is calculated according to the dimensional change of each step thickness of the stepped part wax mold.
Preferably, the wax material to be measured is injected into the cavity of the ring-shaped piece mold to obtain a ring-shaped piece wax mold, and the limiting shrinkage rate of the wax material on the outer ring and the free shrinkage rate of the inner ring are calculated according to the size change of the outer ring and the inner ring of the ring-shaped piece wax mold.
The second aspect of the invention provides the use of a method for measuring shrinkage of wax material, wherein the method for measuring shrinkage of wax material according to any one of claims 1 to 5 is used in the design of a wax mould; the method comprises the following steps:
according to the sizes of the different shrinkage rates of the obtained wax material in multiple directions, the shrinkage rates matched with the different directions are compensated during wax mould design, so that the wax mould design is completed at one time.
The third aspect of the present invention provides a mold for measuring shrinkage rate of wax material, which is used in the method for measuring shrinkage rate of wax material, and includes:
the flat piece die is used for measuring the shrinkage rate in the horizontal direction and the vertical direction of the flow direction;
the stepped part die is used for measuring shrinkage rates in different thickness directions;
and the ring die is used for measuring the limiting shrinkage rate of the outer ring and the free shrinkage rate of the inner ring.
Preferably, the plate member mold includes:
the flat piece lower die is provided with a flat piece cavity, and the flat piece cavity is a cuboid space with an upper opening; a plate part wax injection channel is arranged on the lower die of the plate part, is connected with the cuboid space and is used for injecting wax materials to be tested into the cavity of the plate part;
and the flat piece upper die is arranged on the flat piece lower die, so that the upper opening of the cuboid space of the flat piece lower die is closed.
Preferably, the step piece mold includes:
a step piece lower die;
the stepped part die comprises a stepped part die sliding block with a hollow accommodating space, the stepped part die sliding block is arranged on a lower stepped part die, the hollow accommodating space of the stepped part die sliding block and the upper end face of the lower stepped part die form a stepped part cavity with an opening at the upper part, and steps with different thicknesses distributed in a stepped manner are arranged in the stepped part cavity along the height direction; the stepped part die slide block can move along the outer side direction of the stepped part lower die, so that the wax die is taken out;
a stepped part wax injection channel is arranged on the stepped part die sliding block and is connected with the stepped part cavity and used for injecting wax materials to be tested into the stepped part cavity;
and the ladder piece upper die is arranged on the ladder piece die sliding block to enable the upper opening of the ladder piece cavity to be closed.
Preferably, the ring mold comprises:
the upper end surface of the lower ring-shaped part die is provided with a slide rail which is laid in a shape of a Chinese character 'ji', namely the slide rail comprises arc-shaped rails at two sides and a linear rail in the middle of the position;
the ring part die sliding blocks are arranged on the sliding rails and comprise first sliding blocks, second sliding blocks and third sliding blocks, wherein the first sliding blocks and the second sliding blocks are distributed on arc-shaped rails on two sides of the sliding rails and can slide along the direction of the arc-shaped rails, the third sliding blocks are arranged on a linear rail in the middle of the sliding rails and can slide along the direction of the linear rail, the first sliding blocks and the second sliding blocks are positioned on the outer rings of the third sliding blocks, and the first sliding blocks and the second sliding blocks are positioned on the same outer diameter; the ring-shaped part cavity is formed by the upper end surface of the lower ring-shaped part die, the first sliding block, the second sliding block and the third sliding block, and is an arc space with an upper opening;
and the upper ring piece die is arranged on the lower ring piece die and covers the upper part of the sliding block of the ring piece die, so that the upper part of the arc space of the cavity of the ring piece is opened and closed.
Compared with the prior art, the invention has at least one of the following beneficial effects:
when the method is used for designing the wax mould, the compensation is not performed by singly adopting the same shrinkage rate in each direction, the problem of low size precision of the wax mould caused by adopting the same shrinkage rate in the past is solved, the trouble of repeated mould repair and even mould redesign is avoided, the design concept and the design method are more reasonable, the compensation can be performed at one time in the mould design stage, the wax mould is successfully designed at one time, and the waste of resources is greatly reduced.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic diagram illustrating the steps of a method for measuring shrinkage of wax according to a preferred embodiment of the present invention;
FIG. 2 is a schematic structural view of a wax pattern mold for a plate member according to a preferred embodiment of the present invention;
FIG. 3 is a schematic structural view of a stepped wax pattern mold according to a preferred embodiment of the present invention;
FIG. 4 is a schematic diagram of a ring wax pattern mold according to a preferred embodiment of the present invention;
the scores in the figure are indicated as: the device comprises a flat piece upper die, a flat piece lower die, a flat piece die cavity, a flat piece wax injection channel, a step piece upper die, a step piece lower die, a step piece die slide block, a step piece die cavity, a step piece wax injection channel, a ring piece upper die, a ring piece lower die, a slide rail, a ring piece die slide block and a ring piece die cavity, wherein the flat piece upper die is 1, the flat piece lower die is 2, the flat piece die cavity is 3, the step piece wax injection channel is 4, the step piece upper die.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
Referring to fig. 1, a schematic diagram of the steps of the method for measuring shrinkage of wax according to a preferred embodiment of the present invention is shown, which includes the following steps:
designing a die for measuring horizontal, vertical and thickness and shrinkage in the directions of the outer ring and the inner ring;
injecting the wax material to be measured into a cavity of a designed mold to obtain a wax mold;
and measuring the obtained wax mold and calculating the shrinkage rate to obtain the different shrinkage rates of the wax material to be measured in multiple directions.
Another aspect of this embodiment provides an application of the method for measuring shrinkage rate of wax material, wherein the method for measuring shrinkage rate of wax material is used in wax mold design; the method comprises the following steps:
according to the sizes of the different shrinkage rates of the obtained wax material in multiple directions, the shrinkage rates matched with the design in different directions are compensated during the design of the wax mould, so that the design of the wax mould is successful at one time, the trouble of repeatedly repairing the mould and even re-designing the mould is avoided, and a large amount of time and cost are saved.
When the method is adopted for preparing the wax mould, the corresponding shrinkage rates can be obtained in the horizontal direction, the vertical direction, the different thickness directions and the inner and outer ring directions, so that the accurate compensation can be carried out according to the shrinkage rates in the directions during the mould design, and the problem of low size accuracy of the wax mould caused by the adoption of a single shrinkage rate in the prior art is solved.
In other preferred embodiments, the mold for measuring shrinkage rates in horizontal and vertical directions, shrinkage rates in different thickness directions, outer ring limiting shrinkage rate and inner ring free shrinkage rate is designed, and three different design structures are adopted, including: the device comprises a flat piece die, a step piece die and an annular piece die, wherein the flat piece die is used for measuring the shrinkage rates of the flow direction in the horizontal direction and the vertical direction; the stepped part die is used for measuring shrinkage rates in different thickness directions; the ring die was used to measure the limiting shrinkage of the outer ring and the free shrinkage of the inner ring.
In other preferred embodiments, the wax material to be measured is injected into the cavity of the flat plate part mold to obtain the flat plate part wax mold, and the shrinkage rates of the wax material to be measured in the horizontal direction and the vertical direction in the flowing direction are calculated according to the dimensional changes of the length, the width and the height of the flat plate part wax mold, and the calculation results are shown in table 1.
TABLE 1 shrinkage in flow direction
In other preferred embodiments, the wax material to be measured is injected into the cavity of the stepped part mold to obtain the stepped part wax mold, and the shrinkage rates of the wax material to be measured in different thickness directions are calculated according to the dimensional change of each stepped thickness of the stepped part wax mold, with the calculation results shown in table 2.
TABLE 2 shrinkage in different thickness directions
In other preferred embodiments, the wax material to be measured is injected into a cavity of a ring-shaped piece mold to obtain a ring-shaped piece wax mold, shrinkage rates of the wax material in the outer ring limited shrinkage and the inner ring free shrinkage are calculated according to the size change of the outer ring and the inner ring of the ring-shaped piece wax mold, and the calculation results are shown in table 3.
TABLE 3 constrained shrinkage of the outer ring and free shrinkage of the inner ring
In another embodiment, there is provided a mold for use in the method of measuring shrinkage of wax material of the above embodiment, the mold comprising: a flat piece die, a step piece die and an annular piece die.
The flat plate part mould is used for measuring the shrinkage rate of the flat plate part in the horizontal direction and the vertical direction, namely the shrinkage rate of the wax material in the horizontal direction and the vertical direction can be calculated according to the size change of the flat plate part wax mould in the horizontal direction and the vertical direction. Referring to fig. 2, the plate member mold includes a plate member lower mold 2 and a plate member upper mold 1.
A flat piece cavity 3 is arranged on the upper end face of the flat piece lower die 2, and the flat piece cavity 3 is a cuboid space with an upper opening; the lower die 2 of the flat plate piece is provided with a flat plate piece wax injection channel 4, and the flat plate piece wax injection channel 4 is connected with the cuboid space and used for injecting wax materials to be tested into the flat plate piece cavity 3.
The flat upper die 1 is arranged on the flat lower die 2, so that the upper part of the cuboid space of the flat lower die 2 is open and closed.
And in the injection process of the wax injection machine, the mould locking force of the mould is increased by combining the upper mould 1 and the lower mould 2 of the flat plate piece, wax materials flow through the wax injection channel 4 of the flat plate piece through a wax injection port and finally flow to the flat plate piece mould cavity 3, and the required flat plate piece wax mould is obtained.
In one embodiment, the plate member die may employ the following dimensional parameters: the maximum dimensions of the upper die 1 of the plate member may be: the length is 208mm, the width is 108mm, and the height is 23 mm; the maximum dimensions of the lower die 2 of the flat plate member may be: the length is 208mm, the width is 88mm, and the height is 65 mm; the dimensions of the plate member wax injection channel 4 may be: the length is 27.4mm, the width is 3.6mm, and the height is 2 mm; the dimensions of the flat piece mould cavity 3 may be: the length is 150mm, the width is 40mm, and the height is 2 mm.
The stepped part mould is used for measuring the shrinkage rates in different thickness directions, and the shrinkage rates of the wax materials in different thickness directions can be calculated according to the size change of the stepped part wax mould in different thickness directions. Referring to fig. 3, the stepped part mold includes a stepped part lower mold 6, a stepped part mold slide 7, and a stepped part upper mold 5.
Ladder piece mould slider 7 sets up in 6 up end on ladder piece lower mould, and ladder piece mould slider 7 can remove along 6 outside directions on ladder piece lower mould, and the cavity accommodation space of ladder piece mould slider 7 constitutes the open ladder piece die cavity 8 in upper portion with the up end of ladder piece lower mould 6, is equipped with the step that is the different thickness of ladder distribution along the direction of height in the ladder piece die cavity 8. The stepped part mould sliding block 7 is provided with a stepped part wax injection channel 9, and the stepped part wax injection channel 9 is connected with the stepped part cavity 8 and used for injecting wax materials to be detected into the stepped part cavity 8.
When the wax mold is specifically implemented, the wax mold can be conveniently taken out by moving the stepped part mold, namely, the stepped part mold sliding block 7 moves towards the outer side direction along the stepped part lower mold 6, so that the wax mold in the stepped part cavity 8 can be taken out. As an optimal mode, increase the round hole in ladder piece mould slider 7 one side and be convenient for remove ladder piece mould slider 7 to take out ladder piece wax matrix, take out the emergence of the phenomenon that ladder piece wax matrix card can not be taken out at the mould, the deformation that the ladder piece wax matrix that significantly reduces leads to owing to taking out hard.
The upper stepped part die 5 is arranged on a sliding block 7 of the stepped part die, so that the upper opening of a stepped part cavity 8 is closed.
Annotate the in-process of wax machine at the injection through the combination of ladder piece mould slider 7 and ladder piece last mould 5 and ladder piece lower mould 6, can increase ladder piece mould and annotate the clamping force of wax in-process, wax material annotates wax passageway 9 through ladder piece through annotating the wax mouth, obtains required ladder piece wax matrix.
In one embodiment, the step die may employ the following dimensional parameters: the maximum dimension of the upper step piece die 5 may be: length 218mm, width 94mm, height 42 mm; the dimensions of the stepped part die slide 7 may be: length 218mm, width 94mm, height 42 mm; the maximum dimension of the stepped piece lower die 6 may be: 218mm long, 78mm wide and 42mm high. The stepped part wax injection channel 9 may have dimensions of: the radius is 3mm and the length is 16 mm. The dimensions of the stepped part cavity 8 may be: the width is 32mm, the height is 32mm, and the step height is 2mm, 4mm, 8mm, 12mm, 20mm and 32mm respectively from low to high.
The ring die is used for measuring the limiting shrinkage rate of the outer ring and the free shrinkage rate of the inner ring, and the shrinkage rate of the wax material on the inner ring and the outer ring can be calculated according to the size change of the ring wax die on the outer ring and the inner ring. Referring to fig. 4, the ring mold includes: a ring lower die 11 and a ring die slide 13.
The upper end face of the ring-shaped piece lower die 11 is provided with a slide rail 12, and the slide rail 12 is laid in a shape of a Chinese character, namely the slide rail 12 comprises arc-shaped rails at two sides and a linear rail in the middle. The laying direction of the slide rail 12 is from the tail end of the upper end surface of the lower die of the ring-shaped piece die to the position (about 60.5mm) away from the wax injection port of the upper end surface of the lower die of the ring-shaped piece die.
Annular member mould slider 13 sets up on slide rail 12, and annular member mould slider 13 includes first slider, second slider and third slider, and wherein, first slider, second slider are installed respectively on the arc track of both sides and can be followed the arc track direction and be the slip of type of falling U, but the third slider is installed in the straight line track in the middle and is followed straight line track and carry out the back-and-forth movement. The first sliding block and the second sliding block are positioned on the outer ring of the third sliding block, and the first sliding block and the second sliding block are positioned on the same outer diameter; and the annular piece cavity 14 is formed by the upper end surface of the annular piece lower die 11, the first sliding block, the second sliding block and the third sliding block, and the annular piece cavity 14 is an arc space with an upper opening. Annular piece wax matrix can be conveniently taken out through removing three sliders to prevent that mould locking power is too big and lead to the difficult problem of taking out of wax matrix. The upper ring piece die 10 is arranged on the lower ring piece die 11 and covers the upper part of the sliding block 13 of the ring piece die, so that the upper part of the arc space of the ring piece cavity 14 is open and closed.
The wax injection machine can increase the mold locking force of the stepped part mold in the wax injection process through the combination of the annular part mold sliding blocks 13, the annular part upper mold 10 and the annular part lower mold 11 in the injection process, the annular part mold cavity 14 is formed through the combination of the three annular part mold sliding blocks 13 and the annular part lower mold 11, and after the molding of the annular part wax mold is finished, the three annular part mold sliding blocks 13 are moved through the sliding rails 12 so as to take out the annular part wax mold.
The wax molds made of the molds with the three structures are respectively measured and the shrinkage rates are calculated to obtain the sizes of different shrinkage rates of the wax material in multiple directions, so that compensation of different shrinkage rates can be designed in different directions during mold design, and the wax mold can be successfully designed once.
In one embodiment, the following dimensional parameters may be used for the ring mold: the maximum dimensions of the upper die 10 on the ring may be: length 236mm, width 195mm, height 72 mm; the first slide block and the second slide block are the same in size, and the maximum size of the first slide block and the maximum size of the second slide block can be as follows: length 90.2mm, width 83.5mm, height 100.3 mm; the maximum dimensions of the third slider 13 may be: length 76.7mm, width 52.1mm, height 100.3 mm; the maximum dimensions of the ring lower mold 11 may be: 286mm long by 158mm wide by 23mm high. The dimensions of the ring cavity 14 may be: the arc length of the outer ring is 174.7mm, the arc length of the inner ring is 83.mm, the height is 85mm, and the wall thickness is 3 mm.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (10)
1. A method for measuring shrinkage of wax material is characterized by comprising the following steps:
designing a die for measuring horizontal, vertical and thickness and shrinkage in the directions of the outer ring and the inner ring;
injecting the wax material to be measured into a cavity of a designed mold to obtain a wax mold;
and measuring the obtained wax mold and calculating the shrinkage rate to obtain the different shrinkage rates of the wax material to be measured in multiple directions.
2. The method for measuring shrinkage of wax material according to claim 1, wherein the mold designed to measure shrinkage in horizontal, vertical, thickness and outer and inner ring directions, wherein the mold comprises:
the flat piece die is used for measuring the shrinkage rate in the horizontal direction and the vertical direction of the flow direction;
the stepped part die is used for measuring shrinkage rates in different thickness directions;
and the ring die is used for measuring the limiting shrinkage rate of the outer ring and the free shrinkage rate of the inner ring.
3. The method for measuring shrinkage of wax according to claim 2, wherein the wax to be measured is injected into the cavity of the flat plate member mold to obtain a wax pattern of the flat plate member, and the shrinkage of the wax to be measured in the horizontal and vertical directions in the flowing direction is calculated according to the dimensional changes of the length, width and height of the wax pattern of the flat plate member.
4. The method for measuring the shrinkage rate of the wax material according to claim 2, wherein the wax material to be measured is injected into the cavity of the stepped part mold to obtain a stepped part wax mold, and the shrinkage rate of the wax material to be measured in different thickness directions is calculated according to the size change of each step thickness of the stepped part wax mold.
5. The method for measuring shrinkage of wax material according to claim 2, wherein the wax material to be measured is injected into the cavity of the ring-shaped piece mold to obtain a ring-shaped piece wax mold, and the limiting shrinkage of the wax material in the outer ring and the free shrinkage of the inner ring are calculated according to the dimensional changes of the outer ring and the inner ring of the ring-shaped piece wax mold.
6. Use of a method of measuring shrinkage of wax material, wherein the method of measuring shrinkage of wax material according to any one of claims 1 to 5 is used in wax pattern mold design; the method comprises the following steps:
according to the sizes of the different shrinkage rates of the obtained wax material in multiple directions, the shrinkage rates matched with the different directions are compensated during wax mould design, so that the wax mould design is completed at one time.
7. A mold for measuring shrinkage of wax, which is used in the method for measuring shrinkage of wax according to any one of claims 1 to 5, comprising:
the flat piece die is used for measuring the shrinkage rate in the horizontal direction and the vertical direction of the flow direction;
the stepped part die is used for measuring shrinkage rates in different thickness directions;
and the ring die is used for measuring the limiting shrinkage rate of the outer ring and the free shrinkage rate of the inner ring.
8. A mold for measuring shrinkage of wax according to claim 7, wherein the flat plate member mold comprises:
the flat piece lower die is provided with a flat piece cavity, and the flat piece cavity is a cuboid space with an upper opening; a plate part wax injection channel is arranged on the lower die of the plate part, is connected with the cuboid space and is used for injecting wax materials to be tested into the cavity of the plate part;
and the flat piece upper die is arranged on the flat piece lower die, so that the upper opening of the cuboid space of the flat piece lower die is closed.
9. A mold for measuring shrinkage of wax according to claim 7, wherein the stepped member mold comprises:
a step piece lower die;
the stepped part die comprises a stepped part die sliding block with a hollow accommodating space, the stepped part die sliding block is arranged on a lower stepped part die, the hollow accommodating space of the stepped part die sliding block and the upper end face of the lower stepped part die form a stepped part cavity with an opening at the upper part, and steps with different thicknesses distributed in a stepped manner are arranged in the stepped part cavity along the height direction; the stepped part die slide block can move along the outer side direction of the stepped part lower die, so that the wax die is taken out;
a stepped part wax injection channel is arranged on the stepped part die sliding block and is connected with the stepped part cavity and used for injecting wax materials to be tested into the stepped part cavity;
and the ladder piece upper die is arranged on the ladder piece die sliding block to enable the upper opening of the ladder piece cavity to be closed.
10. A mold for measuring shrinkage of wax according to claim 7, wherein the ring mold comprises:
the upper end surface of the lower ring-shaped part die is provided with a slide rail which is laid in a shape of a Chinese character 'ji', namely the slide rail comprises arc-shaped rails at two sides and a linear rail in the middle of the position;
the ring part die sliding blocks are arranged on the sliding rails and comprise first sliding blocks, second sliding blocks and third sliding blocks, wherein the first sliding blocks and the second sliding blocks are distributed on arc-shaped rails on two sides of the sliding rails and can slide along the direction of the arc-shaped rails, the third sliding blocks are arranged on a linear rail in the middle of the sliding rails and can slide along the direction of the linear rail, the first sliding blocks and the second sliding blocks are positioned on the outer rings of the third sliding blocks, and the first sliding blocks and the second sliding blocks are positioned on the same outer diameter; the ring-shaped part cavity is formed by the upper end surface of the lower ring-shaped part die, the first sliding block, the second sliding block and the third sliding block, and is an arc space with an upper opening;
and the upper ring piece die is arranged on the lower ring piece die and covers the upper part of the sliding block of the ring piece die, so that the upper part of the arc space of the cavity of the ring piece is opened and closed.
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