CN211990817U

CN211990817U - Wax mould for manufacturing femoral condyle shell

Info

Publication number: CN211990817U
Application number: CN202020508641.9U
Authority: CN
Inventors: 刘锐锋
Original assignee: Hebei Ruiiridium Yuantong Technology Co ltd
Current assignee: Hebei Ruiiridium Yuantong Technology Co ltd
Priority date: 2020-04-09
Filing date: 2020-04-09
Publication date: 2020-11-24
Anticipated expiration: 2030-04-09

Abstract

The utility model provides a wax mould for manufacturing a femoral condyle shell, which belongs to the field of artificial joint production and manufacture, wherein the wax mould is provided with a deep hole, a core column is preset in the deep hole, and the core column is connected with a material for manufacturing the shell into a whole and becomes a part of the shell; the utility model provides a wax matrix for making thighbone condyle shell can solve the technical problem that the reference column breaks easily in the thighbone condyle shell manufacturing process.

Description

Wax mould for manufacturing femoral condyle shell

Technical Field

The utility model belongs to the technical field of artificial joint manufacturing, more specifically say, relate to a wax matrix for making thighbone condyle shell.

Background

The process for manufacturing the artificial joint by utilizing the lost foam casting process comprises the following steps: firstly, manufacturing a wax mould with the shape and the structure consistent with those of the artificial joint product, then manufacturing a shell by using the wax mould, removing the wax mould in the shell by melting, forming a casting cavity with the shape consistent with the product in the shell, finally injecting the molten mother alloy into the casting cavity, and cooling to obtain the artificial joint product.

The femoral condyle is an artificial joint product, a wax model for manufacturing the femoral condyle is shown in fig. 1, a cylindrical hole A is arranged on the wax model, and when the wax model is used for manufacturing a shell, a positioning column with the same shape is ideally formed in the cylindrical hole A; however, the depth of the cylindrical hole A is large, so that materials are difficult to enter and completely fill the cylindrical hole A, and after the shell is manufactured, the positioning column which is to be stably fixed on the shell is easy to break, waste products are produced, and the production efficiency and the product quality are affected.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a wax matrix for making thighbone condyle shell aims at solving the technical problem that the reference column breaks easily in the thighbone condyle shell production manufacturing process.

In order to achieve the above object, the present invention provides a wax mold for manufacturing a femoral condyle shell, wherein a deep hole is provided on the wax mold, a stem is preset in the deep hole, and the stem is connected with a material for manufacturing the shell into a whole and becomes a part of the shell.

As another embodiment of the application, one end of the core column is positioned in the deep hole, and the other end of the core column extends out of the deep hole.

As another embodiment of the present application, the length of the core column extending out of the deep hole is less than the thickness of the shell.

As another embodiment of the present application, the stem is fixed in the deep hole by friction with a wall of the deep hole.

As another embodiment of the application, the outer wall of the core column is tightly attached to the wall of the deep hole.

As another embodiment of the present application, the stem is made of zircon sand, mullite sand, or white corundum firing.

As another embodiment of the present application, the stem is made of the same material as the shell.

As another embodiment of the present application, the cross-sections of the deep hole and the core pillar are both circular.

As another embodiment of the present application, the protruding end of the stem is provided with a connection part for sufficiently adhering slurry, so that the stem is integrated with the material for manufacturing the shell.

As another embodiment of the present application, the connection portion and the stem are integrally formed and have a circular cross section, and the diameter of the connection portion is greater than the diameter of the circumscribed circle of the cross section of the stem.

The utility model provides a wax matrix for making thighbone condyle shell, compared with the prior art, will need the material to get into the deep hole originally, just can solidify the column piece that forms, prefabricate for the stem in advance, and preset the stem in the deep hole before making the shell, at wax matrix surface adhesion material like this, when making the shell, the material also can with the stem adhesion, it is even as an organic whole, and the adhesion of material to the stem is very strong, the stem is firm reliable with being connected of material, the stem forms for prefabricating simultaneously, self intensity also can guarantee, consequently no matter be stem and shell junction, still the rupture can not take place, the yields of shell production has been improved greatly, production efficiency and product quality are improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic view of a prior art wax pattern for making a femoral condyle shell;

fig. 2 is a schematic structural diagram of a wax mold for manufacturing a femoral condyle shell according to an embodiment of the present invention;

FIG. 3 is a schematic illustration of the relationship between the protrusion length of the stem and the shell thickness;

fig. 4 is a schematic structural diagram of a stem with a connecting portion in a wax mold for manufacturing a condyle femoral shell according to an embodiment of the present invention.

In the figure: A. a cylindrical bore; 1. deep holes; 2. a stem; 21. a connecting portion.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 2, a wax mold for manufacturing a condyle femoral shell according to the present invention will now be described. The wax mould for manufacturing the femoral condyle shell is provided with a deep hole 1, a core column 2 is preset in the deep hole 1, and the core column 2 is connected with a material for manufacturing the shell into a whole and forms a part of the shell. In fig. 2, the deep hole 1 is cut open for clearly illustrating the depth of the deep hole 1.

The utility model provides a wax matrix for making thighbone condyle shell, compared with the prior art, will need the material to get into deep hole 1 originally, just can solidify the column piece that forms, prefabricate for stem 2 in advance, and preset stem 2 in deep hole 1 before making the shell, like this at wax matrix surface adhesion material, when making the shell, the material also can with 2 adhesions of stem, even as an organic whole, and the material is very strong to the adhesive force of stem 2, stem 2 is firm reliable with being connected of material, stem 2 forms for prefabricating simultaneously, self intensity also can guarantee, consequently no matter be stem 2 and shell junction, still stem 2 self, the rupture can not take place, the yields of shell production has been improved greatly, and production efficiency and product quality are improved.

The specific process flow for manufacturing the shell by using the wax mold is as follows: cleaning the surface of the wax mould after the wax mould is manufactured, then putting the wax mould into slurry with adhesive force to uniformly adhere the slurry, then spraying sand on the surface of the wax mould, and adhering granular sand on the surface of the wax mould under the action of the slurry; and (4) repeatedly carrying out slurry sticking and sand spraying operations until the surface of the wax mould grows to form a material with enough thickness to form a shell. Finally, the wax mould is melted, and a casting cavity with the shape consistent with that of the wax mould is formed in the shell. And injecting molten mother alloy into the pouring cavity to cast the artificial joint product.

In the wax mould provided by the utility model or the prior art, a column is formed at the deep hole 1 after the shell is manufactured; however, in the prior art, the material for manufacturing the shell is not fully fed into the deep hole 1, so that the formed column is easy to generate defects and break; the utility model provides a technical scheme is equivalent to prefabricate this column in advance for stem 2 and preset deep hole 1 in to can guarantee the quality of column self and its and the joint strength of shell, avoid the emergence of the rupture condition.

After the core column 2 is placed in the deep hole 1, one end of the core column is hidden in the deep hole 1, the other end of the core column is exposed outside, and slurry can be hung when slurry is adhered, so that sand grains are adhered to the core column and gradually grow; the exposed end of the core column 2 is naturally combined with the rest part of the shell in the growing process, and the combination is firm and reliable; after the wax pattern is melted off, one end of the stem 2 hidden in the deep hole 1 is exposed and used for forming a hole structure in the artificial joint product.

As a specific embodiment of the wax mold for manufacturing the condyle of femur shell provided by the present invention, please refer to fig. 2, one end of the stem 2 is located in the deep hole 1, and the other end extends out of the deep hole 1. And, the one end that stem 2 is located deep hole 1 generally contacts with the bottom surface of deep hole 1, conveniently fixes a position of stem 2, guarantees that the shell is made the back, and the position of stem 2 is accurate. Actually, the other end of the core column 2 may not extend out of the deep hole 1, but the distance between the other end of the core column and the opening of the deep hole 1 needs to be short, so as to ensure that slurry and sand can be fully contacted with the core column 2 and firmly combined; the other end of the core column 2 extends out of the deep hole 1, and compared with the case that the core column does not extend out of the deep hole 1, the contact area between the core column 2 and slurry and sand grains is increased, firm combination of the core column 2 and a shell can be further guaranteed, and the situation of fracture is prevented.

As a specific embodiment of the wax mold for manufacturing the condyle of femur shell provided by the present invention, please refer to fig. 3, the length of the stem 2 extending out of the deep hole 1 is less than the thickness of the shell. In fig. 3, the part with the grid-shaped section lines is a wax pattern, the two-dot chain line shows the outline of the shell grown on the surface of the wax pattern, H shows the thickness of the shell at the extending end of the core column 2, the length of the core column 2 extending out of the deep hole 1 is less than the thickness, and the extending end of the core column 2 does not cause the bulge on the outer surface of the shell, which is beneficial to keeping the regular shape of the outer surface of the shell; meanwhile, the looseness of the core column 2 caused by accidental collision of the bulges on the outer surface after the shell is manufactured can be prevented.

As a specific embodiment of the wax mold for manufacturing the condyle of femur shell, the stem 2 is fixed in the deep hole 1 by means of the friction force with the hole wall of the deep hole 1. The core column 2 can be preset in the deep hole 1 by directly inserting the core column 2 into the deep hole 1; the size of the outer wall of the core column 2 is slightly larger than the aperture of the deep hole 1, the core column 2 can be inserted into the deep hole 1 by applying force slightly, sufficient friction force can be guaranteed between the surface of the core column 2 and the wall of the deep hole 1, and the core column 2 cannot be separated from the deep hole 1 in the slurry sticking and sand pouring processes. Specifically, when the sections of the core column 2 and the deep hole 1 are both circular, the diameter of the core column 2 is 0.5 to 2mm larger than that of the deep hole 1.

As a specific implementation mode of the wax mould for manufacturing the femoral condyle shell, the outer wall of the core column 2 is tightly attached to the hole wall of the deep hole 1, no gap exists between the core column 2 and the hole wall of the deep hole 1, and materials cannot enter in the slurry sticking and sand spraying processes; after the shell is manufactured, the outer wall of the core column 2 is the working surface of the shell, and the working surface is formed by prefabrication, so that the quality can be guaranteed.

As a specific implementation mode of the wax matrix for manufacturing the condyle of femur shell, the stem 2 is made by zircon sand, mullite sand or white corundum roasting, the above materials can form a compact texture and smooth surface object block by high-temperature high-pressure roasting, the stem 2 is guaranteed to have higher strength and surface quality, and the use requirements are met. Zircon sand, also known as zircon sand, is a mineral composed mainly of zirconium silicate; mullite sand is an aluminum silicate refractory material and can also be applied to a stainless steel precision casting process, and the mullite sand can be formed by high-temperature sintering of kaolin; white corundum is also used as an abrasive, is one of artificial abrasives, and mainly contains aluminum oxide and a small amount of iron oxide, silicon oxide and the like.

As a specific embodiment of the wax mold for manufacturing the femoral condyle shell, the material of the stem 2 is the same as the material of the shell, strictly speaking, the material for spraying the sand is the same as the material of the stem 2 when manufacturing the shell, and the material can be zircon sand, mullite sand or white corundum. The same material of the core column 2 and the shell is beneficial to the firm combination of the core column 2 and the shell, and the core column 2 is prevented from being broken.

As a specific embodiment of the wax mold for manufacturing the condyle shell of femur provided by the present invention, please refer to fig. 1, the cross-sections of the deep hole 1 and the stem 2 are circular. The cross section shapes of the deep hole 1 and the core column 2 are matched with the shapes of the corresponding parts of the artificial joint product, and the round shape is a common shape. If the shape of the artificial joint product changes, the deep hole 1 and the stem 2 can be correspondingly in other shapes, such as rectangle, etc.

As a specific embodiment of the wax mold for manufacturing the condyle shell of femur provided by the present invention, please refer to fig. 4, the extending end of the stem 2 is provided with a connecting portion 21, the connecting portion 21 is used for fully sticking slurry, so as to integrate the stem 2 and the material for manufacturing the shell. Generally, the connecting portion 21 achieves more sufficient slurry adhesion by increasing the contact area, and ensures that the core column 2 is better integrated with the shell formed by slurry and sand.

As a specific embodiment of the wax mold for manufacturing the condyle of femur shell of the present invention, please refer to fig. 4, the connecting portion 21 and the stem 2 are integrally formed, and the cross section is circular, and the diameter of the connecting portion 21 is larger than the diameter of the circumscribed circle of the cross section of the stem 2. The section of the core column 2 is circular, which is beneficial to being held by hands and is convenient for inserting the core column 2 into the deep hole 1; the diameter of connecting portion 21 is greater than the circumscribed circle diameter of the cross section of stem 2, and the cross sectional dimension of connecting portion 21 is greater than the cross sectional dimension of stem 2 promptly to have bigger area of contact, guarantee that stem 2 can fully contact and link as an organic whole with the material that forms the shell, prevent that the rupture condition from taking place.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. The wax mold for manufacturing the femoral condyle shell is provided with a deep hole, and is characterized in that a core column is preset in the deep hole and is connected with a material for manufacturing the shell into a whole and becomes a part of the shell.

2. The wax mold for manufacturing a femoral condylar shell according to claim 1, wherein one end of said stem is located in said deep hole and the other end of said stem extends out of said deep hole.

3. The wax pattern for manufacturing a femoral condylar shell according to claim 2, wherein the length of said stem extending out of said deep hole is less than the thickness of said shell.

4. The wax pattern for manufacturing a femoral condyle shell according to claim 1, wherein the stem is fixed in the deep hole by a friction force with a hole wall of the deep hole.

5. The wax pattern for manufacturing a femoral condylar shell according to claim 1, wherein the outer wall of said stem closely conforms to the wall of said deep hole.

6. The wax mold for manufacturing a femoral condylar shell according to claim 1, wherein said stem is made of zircon sand, mullite sand or white corundum firing.

7. The wax pattern for manufacturing a femoral condyle shell according to claim 1, wherein the stem is made of the same material as the shell.

8. The wax pattern for manufacturing a femoral condyle shell according to claim 1, wherein the deep hole and the core post are both circular in cross section.

9. The wax mold for manufacturing a femoral condylar shell according to claim 2, wherein the protruding end of said stem is provided with a connecting portion for sufficiently cementing to integrate said stem with the material from which the shell is made.

10. The wax mold for manufacturing a femoral condylar shell of claim 9, wherein said connecting portion is integrally formed with said stem and is circular in cross-section, said connecting portion having a diameter greater than the diameter of the circumcircle of the cross-section of said stem.