Manufacturing method of joint line artificial limb mold

Abstract

The invention discloses a manufacturing method of a joint line artificial limb mold in the technical field of artificial limb molds, and the joint line artificial limb mold comprises a hand back mold shell, a palm mold shell, a hand mold sleeve, a port separation blade and an artificial hand inner mold, the hand mold sleeve filled with the artificial hand inner mold is sealed in the mold cavity formed by the hand back mold shell and the palm mold shell through the end opening blocking piece, the mold installation process can be optimized, the artificial hand leather sheath can be directly formed at a time, an integral structure is adopted, and meanwhile, no joint line exists, so that after the silica gel leather sheath is subjected to injection molding, the production efficiency is improved, and the production cost is reduced. A joint line does not need to be ground, so that the manufacturing process is greatly simplified, and the manufacturing of the artificial hand leather sheath is more efficient; due to the fact that the joint line does not need to be ground, the outer surface of the artificial hand leather sheath is smoother, the joint line does not exist, later repair and re-coloring of the ground position are not needed, the whole leather sheath is free of chromatic aberration, and the beauty artificial hand leather sheath manufactured through the device is more vivid.

Description

Technical Field

[0001] The invention relates to the technical field of prosthetic limb moulds, in particular to a method for manufacturing a parting line prosthetic limb mould. Background Art

[0002] Prosthesis is an artificial prosthesis specially designed and manufactured by engineering technology to compensate for amputees or incomplete limb loss, also known as "prosthetic limb". Its main function is to replace some functions of the lost limbs, so that amputees can regain a certain degree of self-care and work ability. It is suitable for amputees due to diseases, traffic accidents, industrial accidents, sports injuries, etc.

[0003] There are many kinds of prostheses, including functional prostheses and aesthetic prostheses. There are also the concept of prostheses that can be controlled by electromyographic signals. The most difficult prostheses are the upper limbs. The lower limbs are relatively simple. The lower limbs only need stable support and can facilitate walking. The upper limbs involve more requirements, such as activity requirements, aesthetic requirements, and even sports requirements.

[0004] Functional prosthesis: Non-mechanical functional prosthesis has very simple functions. This type of upper limb prosthesis uses some modular kits to replace different prostheses in different situations. For example, there is a handle-type shape, which is convenient for holding long poles, a spoon-holding shape for eating, and a cycling grip prosthesis, which is suitable for bicycle handlebars.

[0005] There are mechanical functional prostheses. Most of these lower limb prostheses are equipped with joints and corresponding motion-assisting devices (hydraulic, pneumatic, spring), and even electronic power feedback systems, to achieve the purpose of arm movement to a certain extent.

[0006] Cosmetic prosthesis:

[0007] Purely made for aesthetic purposes, such as cosmetic prosthetic hands, are very helpful for amputees to build confidence and self-esteem. This type of prosthesis also requires makeup or painting, mainly painting skin folds and nail colors, in order to achieve the purpose of making the fake look real.

[0008] The main function of cosmetic prostheses is to look beautiful. Currently, the main material of such cosmetic prostheses is silicone. Colored silicone is the material that is closest to the touch and color of human skin, but the production of silicone prostheses requires mold injection. Silicone is relatively soft and difficult to support stably, so the prosthesis needs to have a hard filler as a skeleton inside, and then wrapped with a simulated skin silicone cover on the outside, also called a leather cover. Similarly, cosmetic prosthetic feet also have an internal skeleton and a silicone mold cover on the outside. The skeleton is generally made of lighter wood and made into a fixed shape. The external finger shape is also mostly fixed. There are also a few prostheses that can slightly move the finger joints, but they are all fake hand leather covers on the outside and support skeletons on the inside.

[0009] The design of the prosthesis skeleton is mainly based on function and support, while the leather cover only involves durability and simulation effect. This kind of cosmetic prosthetic hand leather cover needs to be a closed and complete skin sleeve like human skin on the outside to accommodate the prosthetic skeleton. When designing, a port will be opened at the rear end connected to the residual limb. The port is generally designed in an invisible sleeve or trouser leg for connection and installation with the residual limb of the human body. The silicone prosthetic hand leather cover molded by mold injection has a mold line on its surface because of the mold. This is an inevitable defect in mold making. At present, the mold line will protrude from the outside of the leather cover to form a line. After silicone is molded, it has high toughness. If it is polished with sand, the mold line will be polished rough. There are many bubbles inside the silicone of the leather cover. These bubbles are deliberately filled in during the injection molding of the leather cover to increase the elasticity of the silicone of the leather cover, making it closer to the touch and resilience of the skin. Therefore, the leather cover cannot be polished deep into the material, otherwise tiny pores will be exposed, resulting in an uneven surface of the leather cover. Currently, the main method is to cut first, then polish slightly to avoid polishing into the leather cover material, and then add color. If the thickness is accidentally polished too much and the bubbles inside the leather cover are exposed, it will also need to be repaired. This kind of polishing of the parting line is very cumbersome. To produce a simulated prosthetic hand leather cover, the color adjustment, injection molding and molding processes are not as time-consuming as the polishing and repairing of the parting line. Therefore, the polishing of the parting line greatly increases the difficulty of making a cosmetic prosthetic hand leather cover.

[0010] Based on this, the present invention designs a method for making a parting line prosthetic mold to solve the above problems. Summary of the invention

[0011] The purpose of the present invention is to provide a method for making a prosthetic limb mold with a parting line, which can optimize the mold installation process while directly forming a prosthetic hand leather cover in one step, and has an integral structure without any parting line. Therefore, after the silicone leather cover of the device is injection molded, there is no need to grind the parting line, which greatly simplifies the production process and makes the production of the prosthetic hand leather cover more efficient. Precisely because there is no need to grind the parting line, the outer surface of the prosthetic hand leather cover is smoother and there is no parting line, so there is no need for subsequent repairs and re-coloring of the polished area. The overall leather cover has no color difference, and the cosmetic prosthetic hand leather cover produced by the device is also more realistic.

[0012] The present invention is achieved in this way: a method for making a parting line prosthetic mold, comprising:

[0013] Step S1, performing an external scan on the forearm and palm of a real model to obtain the external shape and size of the forearm and palm; producing a sample of a hollow artificial hand leather cover by 3D printing, wherein the 3D printed artificial hand leather cover sample is an integrally closed silicone sleeve with an opening at the rear end;

[0014] Step S2, first make a port baffle, drill a plurality of positioning holes on the surface of the port baffle, and the positions of the positioning holes correspond to the positions of the embedded nuts and the artificial hand nuts one by one;

[0015] It is also necessary to drill an exhaust hole and a glue injection hole on the port baffle; the positions of the exhaust hole and the glue injection hole correspond to the gap between the inner mold of the artificial hand and the sleeve of the hand mold;

[0016] and pre-tightening the embedded nut and the artificial hand nut on the port baffle;

[0017] Step S3, embedding the port baffle and the embedded nut thereon and the artificial hand nut into the artificial hand leather cover, and then injecting resin into the artificial hand leather cover, and obtaining the artificial hand inner mold after the resin solidifies, and keeping the artificial hand inner mold inside the artificial hand leather cover;

[0018] Step S4, keeping the hand flat with the palm facing upward, laying sculpture clay on the bottom of the overall structure of the artificial hand leather cover with the artificial hand inner mold to form a flat sculpture clay base, and burying the back of the artificial hand leather cover into the top of the sculpture clay base, so that the palm side of the artificial hand leather cover is exposed above the sculpture clay base, and the thickness of the artificial hand leather cover exposed and buried in the sculpture clay base is the same;

[0019] Covering the exposed part of the artificial hand leather cover with sculpture clay above the sculpture clay base, so that the sculpture clay wraps the exposed part of the artificial hand leather cover to form a spacer clay layer, and the spacer clay layer forms a palm-side annular convex ridge at the rear end of the artificial hand leather cover;

[0020] Bolts and positioning nuts are embedded on the top of the wrapping layer, and a groove in the shape of a positioning slot is made. Resin is brushed on the outside of the spacing mud layer, and the palm mold shell is obtained after the resin is solidified.

[0021] Step S5, turning the solidified palm mold upside down as a whole, keeping the back of the hand facing upward and flat, cleaning the sculpture mud base on the back of the hand of the fake hand leather cover, retaining the spacing mud layer formed by the sculpture mud layer covering the palm side, the spacing mud layer forms a back of the hand annular ridge at the rear end of the fake hand leather cover, and the palm side annular ridge and the back of the hand annular ridge form a complete retaining groove shape;

[0022] A layer of sculpture mud is evenly covered on the back of the hand of the fake hand leather glove to form a spacer mud layer on the back of the hand, and resin is brushed on the back of the hand to obtain a back of hand mold shell after the resin is solidified and formed. The back of hand mold shell reserves the position and shape of the locking hole through the embedded bolts, and the applied resin forms a convex block that matches the mounting block through the positioning card slot;

[0023] Step S6, separating the obtained back of hand mold and palm mold, cleaning the interval mud layer between the artificial hand leather cover and the back of hand mold and the palm mold, and cleaning all the sculpture mud remaining outside the back of hand mold, the artificial hand leather cover and the palm mold;

[0024] Step S7, take out the hand back mold shell and palm mold shell that are to be formed, and clean the interval mud layer between the inner side of the hand back mold shell and the artificial hand leather cover to form a hand back mold groove; clean the interval mud layer between the inner side of the palm mold shell and the artificial hand leather cover to form a palm mold groove, and after the hand back mold shell and the palm mold shell are buckled together, the inner hand back mold groove and the palm mold groove form a cavity, and the artificial hand leather cover sample is placed in the cavity, and the hand back mold shell and the palm mold shell are buckled together to form a complete sleeve shell; a gap with the same thickness and shape as the interval mud layer is formed between the cavity inside the hand back mold shell and the palm mold shell and the artificial hand leather cover, and silicone is injected into the gap, and the silicone solidifies to form a hand mold sleeve, and the silicone at the rear port solidifies in the retaining groove to form a mold sleeve retaining ring.

[0025] Furthermore, the mold for forming includes: a back of hand mold shell, a palm mold shell, a hand mold sleeve, a port baffle and a false hand inner mold;

[0026] The back of hand mold and the palm mold are both molds of the prosthesis; the back of hand mold and the palm mold can be separated and assembled to form a sleeve shell of a complete prosthesis, the sleeve shell assembled by the back of hand mold and the palm mold is hollow inside, and the rear end of the sleeve shell assembled by the back of hand mold and the palm mold is open;

[0027] The hand model sleeve is a complete closed flexible sleeve, the rear end of the hand model sleeve is open, the back of the hand model shell and the palm of the hand model shell can be detachably wrapped outside the hand model sleeve, and the hand model sleeve is a mold of the outer contour of the prosthesis; an annular mold sleeve retaining ring is arranged at the edge of the rear end opening of the hand model sleeve, and the plane where the mold sleeve retaining ring is located is perpendicular to the plane where the rear end opening of the hand model sleeve is located;

[0028] The rear end openings of the back of hand mold shell and the palm mold shell are both recessed toward the front end to form a retaining groove; the retaining grooves at the rear ends of the back of hand mold shell and the palm mold shell are spliced ​​into a complete annular groove, the mold sleeve retaining ring can be detachably embedded in the retaining groove, and the outer side surface of the mold sleeve retaining ring is flush with the outer end surface of the retaining groove, and the rear end opening of the hand mold sleeve is on the same plane as the rear end opening of the sleeve shell composed of the back of hand mold shell and the palm mold shell;

[0029] The artificial hand inner mold is a closed hard model, the shape of the artificial hand inner mold is the same as the shape of the artificial limb, and the artificial hand inner mold can be detachably inserted into the inside of the hand mold sleeve;

[0030] The port baffle is a flat plate structure, and the port baffle can be detachably covered on the rear end openings of the hand mold sleeve, the back of the hand mold shell, and the palm mold shell; the port baffle is also provided with an exhaust hole and a glue injection hole; the exhaust hole and the glue injection hole penetrate both sides of the port baffle;

[0031] The rear ends of the back of hand mold shell, the palm mold shell and the hand mold sleeve are sealed and locked with the port baffle through bolts.

[0032] Furthermore, the artificial hand leather case is formed into the shape of a reserved retaining groove, an embedded nut and a positioning groove by inverting the clay model on the palm side, and a plurality of positioning slots and a plurality of locking holes are opened on the clay model on the palm side, and then the back of the hand of the clay model on the palm side is coated with resin, and glass fiber cloth is covered in the middle of the resin layer as a reinforcement layer, so that the resin is solidified and formed on the back of the hand of the clay model on the palm side, and then the clay model on the palm side is cleaned up to form an independent back of hand mold shell overall structure.

[0033] Furthermore, the rear end of the artificial hand leather cover is open, and the thickness of the artificial hand leather cover is 2.5 mm;

[0034] The thickness of the injection molded hand mold sleeve is also 10mm.

[0035] Furthermore, the joint surfaces of the back of hand mold shell and the palm mold shell are flat and fitted, the outer sides of the back of hand mold shell and the palm mold shell are convex outward; the inner side surface of the back of hand mold shell is a back of hand mold groove that is concave outward; the inner side surface of the palm mold shell is a palm mold groove that is concave toward the palm side; the back of hand mold groove and the palm mold groove are covered to form a sealed cavity with a rear end opening;

[0036] The back of hand mold groove and the palm of hand mold groove are tightly fitted on the outside of the hand mold sleeve;

[0037] The back of hand mold shell is provided with a plurality of positioning slots and a plurality of locking holes;

[0038] A plurality of positioning slots and a plurality of locking holes are arranged around the edge of the hand back mold groove, and the positioning slots and the locking holes do not contact the hand back mold groove;

[0039] The palm mold shell is provided with a plurality of positioning slots 21 and a plurality of positioning nuts;

[0040] Each of the positioning nuts is embedded in the joint surface of the palm shell, and the positioning nut is located inside the joint surface of the palm shell;

[0041] A plurality of positioning slots 21 and a plurality of positioning nuts are arranged around the periphery of the palm mold groove, and each positioning slot 21 and each positioning nut are aligned with the palm mold groove;

[0042] Each of the positioning nuts on the assembled back-of-hand mold shell and the palm mold shell corresponds one-to-one to a locking hole position.

[0043] Furthermore, the hand model sleeve is an integral sleeve structure formed of silicone, and positioning blocks are provided on the left and right sides of the outer wall of the hand model sleeve;

[0044] Positioning grooves are also provided on the joint surfaces of the back of hand mold shell and the palm of hand mold shell;

[0045] The positioning groove is recessed downward and is arranged on the joint surface of the back of hand mold shell and the palm mold shell, and the corresponding positions of the positioning grooves on the back of hand mold shell and the palm mold shell are spliced ​​to form a square cavity; the positioning block can be detachably embedded in the cavity spliced ​​by the positioning grooves;

[0046] The clearance between the positioning block and the positioning groove is matched, and the clearance does not exceed 1mm.

[0047] Furthermore, the inner mold of the artificial hand is a solid hand model of resin;

[0048] The rear end of the artificial hand inner mold is a plane, and a plurality of artificial hand nuts are embedded in the rear end of the artificial hand inner mold.

[0049] Furthermore, the port baffle is a transparent PVC flat plate, and the rear end surfaces of the back of hand mold shell and the palm mold shell are within the coverage of the port baffle;

[0050] The port baffle is also provided with a plurality of positioning holes, and the plurality of positioning holes are evenly distributed on the port baffle in two annular circles, and the positioning holes in the inner circle correspond one by one to the positions of the plurality of prosthetic hand nuts;

[0051] A plurality of pre-embedded nuts are embedded at the rear ends of the back of hand mold shell and the palm mold shell;

[0052] The positioning holes of the outer ring correspond one by one to the positions of the embedded nuts provided at the rear ends of the back of the hand mold shell and the palm of the hand mold shell.

[0053] The beneficial effects of the present invention are as follows: 1. The present invention still designs a mold-closing method to make the mold, so it is more convenient to fill the hand model sleeve inside, so that the placement of the artificial hand leather cover and the outer mold and inner mold of the device is smoother and more convenient. Through the splicing and docking method of the back of the hand mold shell and the palm mold shell, the installation of the hand model sleeve and the artificial hand inner mold is more convenient and the operation is simpler;

[0054] 2. The device adds a hand mold sleeve, and the back of the hand mold shell and the palm mold shell are used to shape the outside of the hand mold sleeve to avoid deformation of the hand mold sleeve due to high temperature and injection molding fluid material, thereby ensuring the stability of the external shape of the hand mold sleeve, providing effective support and constraint, and forming the internal and external shaping of the mold through the cooperation of the artificial hand inner mold and the hand mold sleeve, so that the artificial hand leather cover after final injection molding of the device has only two contact surfaces, and they are complete curved surfaces. The hand mold sleeve has high elasticity and can directly remove the hand mold sleeve from the outside of the artificial hand inner mold to form a complete artificial hand leather cover. There is no parting line after the entire leather cover is formed. It is precisely because the leather cover injection molded by the device has no parting line, the step of polishing the parting line is omitted, and there is no need to repair and recolor the polished area, which further avoids the problem of color fading after recoloring, making the entire leather cover more integrated. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The present invention will be further described below in conjunction with embodiments with reference to the accompanying drawings.

[0056] Figure 1 This is a schematic diagram of the overall external structure of one side of the back of hand mold shell of the present invention;

[0057] Figure 2 This is a schematic diagram of the overall external structure of one side of the palm mold shell after the artificial hand inner mold and the hand mold sleeve are removed;

[0058] Figure 3 It is a side view schematic diagram of the external structure of the palm formwork and the palm formwork spliced ​​state of the present invention;

[0059] Figure 4 This is a schematic diagram of the internal structure of the back of hand mold shell of the present invention;

[0060] Figure 5 This is a schematic diagram of the internal structure of the palm mold shell of the present invention;

[0061] Figure 6 This is a schematic diagram of the structure of the hand model sleeve of the present invention;

[0062] Figure 7 This is a schematic diagram of the inner mold structure of the artificial hand of the present invention;

[0063] Figure 8 This is a schematic diagram of the port baffle structure of the present invention;

[0064] Fig. 9 This is a schematic diagram of the structure of the artificial hand leather cover of the present invention;

[0065] Fig.10 This is a schematic diagram of the shape of one side of the palm of a sculpture clay hand wrapped outside the leather cover of the artificial hand of the present invention;

[0066] Fig.11 This is a schematic diagram of the shape of the back of a sculptured clay hand wrapped by the outer surface of the artificial hand leather cover of the present invention.

[0067] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0068] 1-back of hand mold shell, 11-paired clamping block, 12-locking hole, 13-back of hand mold groove, 14-bolt, 2-palm mold shell, 21-positioning slot, 22-positioning nut, 23-palm mold groove, 3-hand mold sleeve, 31-mold sleeve retaining ring, 32-positioning block, 4-port baffle, 41-exhaust hole, 42-glue injection hole, 43-positioning hole, 5-retaining groove, 51-embedded nut, 52-positioning groove, 6-artificial hand inner mold, 61-artificial hand nut, 7-artificial hand leather cover, 71-spacer mud layer. DETAILED DESCRIPTION

[0069] See also Figures 1 to 11As shown, the present invention provides a method for manufacturing a parting line prosthetic mold. In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings in the specification and specific implementation methods.

[0070] In a specific embodiment of the technical solution of the present invention:

[0071] The prosthetic mold includes a back of hand mold shell 1, a palm mold shell 2, a hand mold sleeve 3, a port baffle 4 and a prosthetic hand inner mold 6;

[0072] The back of hand mold shell 1 and the palm mold shell 2 are both molds of the prosthesis; the back of hand mold shell 1 and the palm mold shell 2 can be separated and assembled to form a sleeve shell of a complete prosthesis, the sleeve shell assembled by the back of hand mold shell 1 and the palm mold shell 2 is hollow inside, and the rear end of the sleeve shell assembled by the back of hand mold shell 1 and the palm mold shell 2 is open; the splicing surface of the back of hand mold shell 1 and the palm mold shell 2 is flat and fit, and the outer sides of the back of hand mold shell 1 and the palm mold shell 2 are convex outward; the inner side of the back of hand mold shell 1 is hollow inside, and the inner side of the back of hand mold shell 1 is hollow inside. The side surface is a back-of-hand mold groove 13 that is concave outward; the outer side surface of the back-of-hand mold shell 1 is pushed outward by the back-of-hand mold groove 13 to form an arm shape; the inner side surface of the palm mold shell 2 is a palm mold groove 23 that is concave toward the palm side; the outer side surface of the palm mold shell 2 is pushed toward the palm side by the palm mold groove 23 to form a convex arc surface, wherein the shape of the inner side concave and the outer side convex is the conventional shape of the mold; the back-of-hand mold groove 13 and the palm mold groove 23 are covered to form a sealed cavity with a rear end opening;

[0073] The back of hand mold groove 13 and the palm of hand mold groove 23 are tightly fitted on the outside of the hand mold sleeve 3;

[0074] A plurality of matching blocks 11 and a plurality of locking holes 12 are provided on the back of hand mold shell 1;

[0075] A plurality of mounting blocks 11 and a plurality of locking holes 12 are arranged around the edge of the hand back mold groove 13, and the mounting blocks 11 and the locking holes 12 are not in contact with the hand back mold groove 13;

[0076] A plurality of positioning slots 21 and a plurality of positioning nuts 22 are provided on the palm mold shell 2;

[0077] Each positioning nut 22 is embedded in the joint surface of the palm shell 2, and the positioning nut 22 is located inside the joint surface of the palm shell 2;

[0078] A plurality of positioning slots 21 and a plurality of positioning nuts 22 are disposed around the periphery of the palm mold groove 23, and each positioning slot 21 and each positioning nut 22 are aligned with the palm mold groove 23;

[0079] Each positioning nut 22 on the assembled back of hand mold 1 and palm mold 2 corresponds to a locking hole 12 position one by one.

[0080] Such a structure ensures that after the back of the hand mold 1 and the palm mold 2 are fitted and spliced, each positioning slot 21 can be fitted and limited in a one-to-one correspondence with a matching block 11; and at this time, the positioning nuts 22 are aligned with a locking hole 12, and then can be locked on the positioning nuts 22 by passing bolts through the locking hole 12. In this way, the fitting surfaces of the back of the hand mold 1 and the palm mold 2 can be stably spliced ​​with each other and cannot slide, and the two can also be fitted together and cannot be separated by bolts, thereby ensuring the stable splicing of the mold assembled by the back of the hand mold 1 and the palm mold 2.

[0081] The hand model sleeve 3 is a complete closed flexible sleeve, the rear end of the hand model sleeve 3 is open, the back of the hand model shell 1 and the palm of the hand model shell 2 can be detachably wrapped around the outside of the hand model sleeve 3, the hand model sleeve 3 is a mold of the outer contour of the prosthesis, the inner cavity shape of the hand model sleeve 3 is the same as the outer shape of the prosthesis, the inner wall shape of the hand model sleeve 3 is consistent with the designed outer wall shape of the prosthesis, and the inner wall of the hand model sleeve 3 is basically consistent with the outer wall shape of the prosthetic hand inner mold 6, and the outer shape of the prosthetic hand inner mold 6 is consistent with the designed outer shape of the prosthesis skeleton. Generally speaking, the shape of the prosthetic hand does not take into account the activity and the activity of the finger joints, nor the activity of the wrist joints, but only the shape. As for the length and thickness, it is based on the size of the patient's other arm. , needs to be customized, but the prosthetic hand model sleeve 3 manufactured by such a mold of the device has no parting line on the outer wall, and this mold can be used repeatedly. When the patient's hand model sleeve 3 is used for a long time and has color difference or aging, it needs to be replaced with a new hand model sleeve 3, which only needs to be re-injected with silicone. Of course, the device is more efficient in producing a universal prosthetic mold. There is no need to grind the parting line, nor to re-draw the traces left by grinding the parting line. One-time molding and batch production are high in efficiency and integrity; an annular mold sleeve retaining ring 31 is set at the edge of the rear end opening of the hand model sleeve 3, and the plane where the mold sleeve retaining ring 31 is located is perpendicular to the plane where the rear end opening of the hand model sleeve 3 is located;

[0082] The hand model sleeve 3 is an integral sleeve structure formed of silicone, and positioning blocks 32 are provided on the left and right sides of the outer wall of the hand model sleeve 3;

[0083] Positioning grooves 52 are also provided on the joint surfaces of the back of hand mold shell 1 and the palm of hand mold shell 2;

[0084] The positioning groove 52 is recessed downward and is provided on the joint surface of the back of hand mold shell 1 and the palm mold shell 2. The positions of the positioning grooves 52 on the back of hand mold shell 1 and the palm mold shell 2 are correspondingly joined to form a square cavity; the positioning block 32 can be detachably embedded in the cavity joined by the positioning grooves 52;

[0085] The clearance between the positioning block 32 and the positioning groove 52 is matched, and the clearance does not exceed 1 mm, so that the thickness of each part of the final artificial hand leather cover 7 is kept uniform.

[0086] The rear openings of the back of the hand mold shell 1 and the palm mold shell 2 are both recessed toward the front end to form a retaining groove 5; the retaining grooves 5 at the rear ends of the back of the hand mold shell 1 and the palm mold shell 2 are spliced ​​into a complete annular groove, the mold sleeve retaining ring 31 can be detachably embedded in the retaining groove 5, and the outer side surface of the mold sleeve retaining ring 31 is flush with the outer end surface of the retaining groove 5, and the rear opening of the hand mold sleeve 3 is on the same plane as the rear opening of the sleeve shell composed of the back of the hand mold shell 1 and the palm mold shell 2;

[0087] The artificial hand inner mold 6 is a closed hard mold, and its shape is the same as that of the artificial limb. The artificial hand inner mold 6 can be detachably inserted into the hand mold sleeve 3. The artificial hand inner mold 6 is a solid hand model made of resin. The rear end of the artificial hand inner mold 6 is a plane, and a plurality of artificial hand nuts 61 are embedded in the rear end of the artificial hand inner mold 6. The artificial hand inner mold 6 needs to have a smooth surface and sufficient hardness.

[0088] The port baffle 4 is a flat plate structure, and the port baffle 4 can be detachably covered on the rear end openings of the hand mold sleeve 3, the back of the hand mold shell 1 and the palm mold shell 2; the port baffle 4 is also provided with an exhaust hole 41 and a glue injection hole 42; the exhaust hole 41 and the glue injection hole 42 penetrate both sides of the port baffle 4; the port baffle 4 is a transparent PVC flat plate, and the rear end surfaces of the back of the hand mold shell 1 and the palm mold shell 2 are within the coverage of the port baffle 4;

[0089] A plurality of positioning holes 42 are also provided on the port baffle 4, and the plurality of positioning holes 42 are evenly distributed in two annular circles on the port baffle 4, and the inner circle of positioning holes 42 corresponds one to one with the positions of the plurality of prosthetic hand nuts 61; there are two circles of positioning holes 42, and the inner circle of positioning holes 42 is within the coverage range of the prosthetic hand inner mold 6, while the outer circle of positioning holes 42 is within the corresponding range of the rear ends of the back of the hand mold shell 1 and the palm of the hand mold shell 2.

[0090] A plurality of embedded nuts 51 are embedded at the rear ends of the back of hand mold shell 1 and the palm mold shell 2; the embedded nuts 51 are located inside the back of hand mold shell 1 and the palm mold shell 2, and the rear end surfaces of the back of hand mold shell 1 and the palm mold shell 2 are flat surfaces; the hand mold sleeve 3 filled with the artificial hand inner mold 6 is closed inside the mold cavity formed by the back of hand mold shell 1 and the palm mold shell 2 through the port baffle 4; a mature force-bearing structure is formed, and then silicone can be easily injected into the mold cavity gap between the hand mold sleeve 3 and the artificial hand inner mold 6, and the final solidification molding is the same shape as the inner wall of the hand mold sleeve 3 on the outside, and the molded inner wall is the same shape as the outer wall of the artificial hand inner mold 6.

[0091] The positioning holes 42 of the outer ring correspond one by one to the positions of the embedded nuts 51 opened at the rear ends of the back of the hand mold shell 1 and the palm mold shell 2 respectively. The rear ends of the back of the hand mold shell 1, the palm mold shell 2 and the hand mold sleeve 3 are sealed and locked with the port baffle 4 by bolts. The bolts pass through the positioning holes 42 and are locked in the embedded nuts 51 and the artificial hand nuts 61. Such a structure can limit and lock the positions of the back of the hand mold shell 1, the palm mold shell 2 and the artificial hand inner mold 6, which is convenient for the later injection of liquid silicone from the injection hole 42. The injected silicone sinks to the bottom, and the air in the hand mold sleeve 3 is discharged through the exhaust hole 41, so that the finally formed artificial hand leather cover 7 remains intact.

[0092] The method for making the mold comprises the following steps:

[0093] Step S1, externally scanning the forearm and palm of a real model to obtain the external shape and size of the forearm and palm; producing a sample of a hollow artificial hand leather cover 7 by 3D printing, wherein the 3D printed artificial hand leather cover 7 sample is an integrally closed silicone sleeve with an opening at the rear end;

[0094] Step S2, first make the port baffle 4, drill a plurality of positioning holes 43 on the surface of the port baffle 4, and the positions of the positioning holes 43 correspond to the positions of the embedded nuts 51 and the artificial hand nuts 61 one by one;

[0095] It is also necessary to drill an exhaust hole 41 and a glue injection hole 42 on the port baffle 4; the positions of the exhaust hole 41 and the glue injection hole 42 correspond to the gap between the artificial hand inner mold 6 and the hand mold sleeve 3;

[0096] And pre-tighten the embedded nut 51 and the artificial hand nut 61 on the port baffle 4;

[0097] Step S3, embedding the port baffle 4 and the embedded nut 51 and the artificial hand nut 61 thereon into the artificial hand leather cover 7, and then injecting resin into the artificial hand leather cover 7, and obtaining the artificial hand inner mold 6 after the resin solidifies, and keeping the artificial hand inner mold 6 inside the artificial hand leather cover 7;

[0098] Step S4, keep the hand flat with the palm facing upward, lay sculpture clay on the bottom of the overall structure of the artificial hand leather cover 7 with the artificial hand inner mold 6, lay it into a flat sculpture clay base, and bury the back of the artificial hand leather cover 7 into the top of the sculpture clay base, so that the palm side of the artificial hand leather cover 7 is exposed above the sculpture clay base, and the thickness of the artificial hand leather cover 7 exposed and buried in the sculpture clay base is the same;

[0099] The exposed part of the artificial hand leather cover 7 above the sculpture clay base is covered with sculpture clay, so that the sculpture clay wraps the exposed part of the artificial hand leather cover 7 to form a spacer clay layer 71, and the spacer clay layer 71 forms a palm-side annular convex ridge at the rear end of the artificial hand leather cover 7;

[0100] Bolts 14 and positioning nuts 22 are embedded on the top of the wrapping layer, and a groove in the shape of a positioning slot 21 is made. Resin is brushed on the outside of the spacing mud layer 71, and the palm mold shell 2 is obtained after the resin is solidified.

[0101] Step S5, turn the solidified palm mold shell 2 mold upside down as a whole, keep the back of the hand facing up and lay it flat, clean up the sculpture mud base on the back of the hand leather cover 7, and retain the spacing mud layer 71 formed by the sculpture mud layer covering the palm side, the spacing mud layer 71 forms a back of the hand annular ridge at the rear end of the fake hand leather cover 7, and the palm side annular ridge and the back of the hand annular ridge form a complete retaining groove 5 shape;

[0102] A layer of sculpture mud is evenly covered on the back of the hand of the artificial hand leather cover 7 to form a spacer mud layer 71 on the back of the hand, and resin is brushed on the back of the hand to obtain a back of hand mold shell 1 after the resin is solidified. The back of hand mold shell 1 reserves the position and shape of the locking hole 12 through the embedded bolt 14, and the applied resin forms a convex block matching the mounting block 11 through the positioning card slot 21;

[0103] When the spacer clay layer 71 is made of sculpture clay, it is necessary to make a convex block with the same shape as the positioning groove 52 on the back of the hand and the palm side, so that the convex block forms a groove on the back of the hand mold shell 1 and the palm mold shell 2 when the resin is used for molding, and the positioning block 32 is formed after the hand mold sleeve 3 is finally injection molded;

[0104] Step S6, separating the obtained back of hand mold 1 and palm mold 2, cleaning the spacer mud layer 71 retained between the artificial hand leather cover 7 and the back of hand mold 1 and the palm mold 2, and cleaning all the sculpture mud remaining outside the back of hand mold 1, the artificial hand leather cover 7 and the palm mold 2;

[0105] Step S7, take out the formed back-of-hand mold shell 1 and palm mold shell 2, clean the spacing mud layer 71 between the inner side of the back-of-hand mold shell 1 and the artificial hand leather cover 7 to form a back-of-hand mold groove 13; clean the spacing mud layer 71 between the inner side of the palm mold shell 2 and the artificial hand leather cover 7 to form a palm mold groove 23, after the back-of-hand mold shell 1 and the palm mold shell 2 are buckled together, the internal back-of-hand mold groove 13 and the palm mold groove 23 form a cavity, put the artificial hand leather cover 7 sample into the cavity, and buckle the back-of-hand mold shell 1 and the palm mold shell 2 to form a complete sleeve shell; a gap with the same thickness and shape as the spacing mud layer 71 is formed between the cavity inside the back-of-hand mold shell 1 and the palm mold shell 2 and the artificial hand leather cover 7, and silicone is injected into the gap, and the silicone solidifies to form a hand mold sleeve 3, and the silicone at the rear port solidifies in the groove of the retaining groove 5 to form a mold sleeve retaining ring 31.

[0106] Similarly, the device is also suitable for the production of artificial foot leather covers and molds thereof, which only need to be made into two separate mold halves and the sleeve is made to achieve no parting line.

[0107] It should be noted that:

[0108] 1. When making the artificial hand leather cover 7, it is necessary to reserve space for the prosthetic skeleton. Therefore, when the leather cover is clamped for injection molding, the artificial hand inner mold 6 needs to be placed inside the hand mold sleeve 3 to fill the space of the prosthetic skeleton. The shape of the artificial hand inner mold 6 is basically the shape of the prosthetic skeleton. Because the artificial hand leather cover 7 finally injected has a certain elasticity, the shape of the artificial hand inner mold 6 and the hand mold sleeve 3 can have a slight deviation. This error generally needs to be controlled within 2mm to ensure that the elasticity of the silicone can accommodate the error of the mold;

[0109] 2. The palm size is large and the arm cross-section is cotter pin, so the production of the artificial hand leather cover 7 currently can only use a semi-open mold structure, and the production of the artificial foot leather cover is the same. The size of the foot is larger than the cross-sectional diameter of the calf. Therefore, the production of the artificial foot leather cover can only use a semi-open mold structure, and the semi-open mold will inevitably produce a mold line after the mold is closed and injection molded, and the later polishing of the mold line is very troublesome, and the color needs to be supplemented after polishing, which not only has color difference but also is easy to fade; the present device adds a hand mold sleeve 3, which changes the original method of directly placing the inner mold after splicing the outer mold and then injection molding. After the hand mold sleeve 3 is added in the middle, the artificial hand leather cover 7 is finally injection molded in the hand mold sleeve 3, and the hand mold sleeve 3 is a complete sleeve, and the artificial hand inner mold 6 is also It is a complete whole, and the fake hand inner mold 6 and the hand mold sleeve 3 can be polished normally during production, and the hand mold sleeve 3 is made of high-density silicone material, and does not require the internal injection of elastic bubbles or other structures. The device makes a more convenient hand mold sleeve 3 and a fake hand inner mold 6 as a molding mold for the fake hand leather cover 7, so that the entire fake hand leather cover 7 forms a complete sleeve, and it is an integrated structure, there is no parting line, and no subsequent polishing is required. Not only is the process simpler, but the appearance of the final formed fake hand leather cover 7 is more realistic. The gap at the parting is at the joint of the back of the hand mold shell 1 and the palm mold shell 2, and there is no gap at the injection molding gap between the hand mold sleeve 3 and the fake hand inner mold 6, so there will be no parting line, the appearance is smooth, no polishing is required, and no subsequent filling and coloring are required. The integrated leather cover has uniform and stable coloring.

[0110] When the present invention is used, the hand model sleeve 3 and the artificial hand inner mold 6 are first taken, and a demoulding oil such as a degumming agent is evenly applied to the outside of the artificial hand inner mold 6; then the rear end opening of the hand model sleeve 3 is pulled and expanded, and the artificial hand inner mold 6 is inserted into the hand model sleeve 3, and then the outside of the hand model sleeve 3 equipped with the artificial hand inner mold 6 is clamped between the back of the hand mold shell 1 and the palm mold shell 2.

[0111] When clamping the back of hand mold shell 1 and the palm mold shell 2, the matching block 11 is matched with the positioning slot 21 one by one, and the positioning nut 22 is matched with the locking hole 12 one by one, and finally the back of hand mold shell 1 and the palm mold shell 2 are locked by nuts.

[0112] When the back of hand mold shell 1 and the palm mold shell 2 are assembled, the mold sleeve retaining ring 31 is clamped in the retaining groove 5, and the upper and lower sides of the positioning block 32 are clamped and matched with the positioning grooves 52 of the back of hand mold shell 1 and the palm mold shell 2.

[0113] Make sure that the hand model sleeve 3 is neatly inserted into the back of the hand mold shell 1 and the palm mold shell 2, then install the port baffle 4, align the positioning holes 43 of the outer ring with the embedded nuts of the back of the hand mold shell 1 and the palm mold shell 2, and lock them with screws, align the positioning holes 43 of the inner ring with the artificial hand nut 61, and lock them together with bolts.

[0114] After aligning and assembling the back of hand mold shell 1, palm mold shell 2, hand mold sleeve 3, artificial hand inner mold 6 and port baffle 6 as a whole, the whole structure is placed vertically so that the port baffle 4 is set horizontally upward; finally, liquid silicone raw material is injected into the injection hole 42 until the silicone overflows from the exhaust hole 41, and the injection molding operation is completed. After the silicone in the mold cools and solidifies, the port baffle 4 is opened, and the back of hand mold shell 1 and the palm mold shell 2 are separated. Finally, the hand mold sleeve 3 is opened, and the artificial hand inner mold 6 is extracted from the inside to obtain a complete artificial hand leather cover 7, and it is a complete artificial hand leather cover 7 without a mold line, so as to achieve the purpose of mass production of artificial hand leather cover 7. Of course, production in this way can also be customized, that is, in step s1, the scanning of the model is changed to the scanning of the other arm of the patient, and the shape of the residual limb is obtained after mirroring. The artificial hand leather cover 7 finally produced also has no mold line, but this device is used for standardized mass production, and the production efficiency is higher, and its advantages can be more effectively exerted.

[0115] The front end of the device refers to one end of the finger, and the rear end refers to the joint of the residual limb of the arm. The orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0116] Although the specific implementation modes of the present invention are described above, those skilled in the art should understand that the specific implementation modes described are only illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A method for making a parting line prosthetic mold, characterized in that: The following steps are involved: Step S1, performing an external scan on the forearm and palm of a real model to obtain the external shape and size of the forearm and palm; producing a sample of a hollow artificial hand leather cover (7) by 3D printing, wherein the 3D printed artificial hand leather cover (7) sample is an integrally closed silicone sleeve with an opening at the rear end; Step S2, firstly making a port baffle (4), drilling a plurality of positioning holes (43) on the surface of the port baffle (4), wherein the positions of the positioning holes (43) correspond one to one with the positions of the embedded nuts (51) and the artificial hand nuts (61); An exhaust hole (41) and a glue injection hole (42) need to be drilled on the port baffle (4); the positions of the exhaust hole (41) and the glue injection hole (42) correspond to the gap between the inner mold of the artificial hand (6) and the hand mold sleeve (3); and pre-tightening the embedded nut (51) and the artificial hand nut (61) on the port baffle (4); Step S3, embedding the port baffle (4) and the embedded nut (51) thereon and the artificial hand nut (61) into the artificial hand leather cover (7), and then injecting resin into the artificial hand leather cover (7), and obtaining the artificial hand inner mold (6) after the resin solidifies, and keeping the artificial hand inner mold (6) inside the artificial hand leather cover (7); Step S4, keeping the hand flat with the palm facing upward, laying sculpture clay on the bottom of the overall structure of the artificial hand leather cover (7) with the artificial hand inner mold (6) to form a flat sculpture clay base, and burying the back of the hand of the artificial hand leather cover (7) into the top of the sculpture clay base, so that the palm side of the artificial hand leather cover (7) is exposed above the sculpture clay base, and the thickness of the artificial hand leather cover (7) exposed and buried in the sculpture clay base is the same; The exposed part of the artificial hand leather cover (7) above the sculpture clay base is covered with sculpture clay, so that the sculpture clay wraps the exposed part of the artificial hand leather cover (7) to form a spacer clay layer (71), and the spacer clay layer (71) forms a palm-side annular convex ridge at the rear end of the artificial hand leather cover (7); Bolts (14) and positioning nuts (22) are embedded on the top of the wrapping layer, and a groove in the shape of a positioning slot (21) is made. Resin is brushed on the outside of the spacing mud layer (71), and after the resin is solidified and formed, a palm mold shell (2) is obtained; Step S5, turning the solidified palm mold (2) upside down as a whole, keeping the back of the hand facing upward and laying it flat, cleaning the sculpture mud base on the back of the hand of the artificial hand leather cover (7), and retaining the spacing mud layer (71) formed by the sculpture mud layer covering the palm side, the spacing mud layer (71) forms a back of hand annular ridge at the rear end of the artificial hand leather cover (7), and the palm side annular ridge and the back of the hand annular ridge form a complete retaining groove (5) shape; A layer of sculpture clay is evenly covered on the back of the hand of the artificial hand leather cover (7) to form a spacer clay layer (71) on the back of the hand, and resin is brushed on the back of the hand. After the resin is solidified and formed, a back of hand mold shell (1) is obtained. The back of hand mold shell (1) is reserved with the position and shape of the locking hole (12) through the embedded bolt (14), and the applied resin is formed into a convex block matching the mounting block (11) through the positioning card slot (21); Step S6, the obtained back of hand mold (1) and palm mold (2) are separated, and the interval mud layer (71) retained between the artificial hand leather cover (7) and the back of hand mold (1) and the palm mold (2) is cleaned, and all the sculpture mud remaining outside the back of hand mold (1), the artificial hand leather cover (7) and the palm mold (2) is cleaned; Step S7, taking out the hand back mold shell (1) and the palm mold shell (2) that are to be formed, cleaning the mud layer (71) between the inner side of the hand back mold shell (1) and the artificial hand leather cover (7) to form a hand back mold groove (13); cleaning the mud layer (71) between the inner side of the palm mold shell (2) and the artificial hand leather cover (7) to form a palm mold groove (23), after the hand back mold shell (1) and the palm mold shell (2) are buckled together, the inner hand back mold groove (13) and the palm mold groove (23) are formed. A cavity is formed, the artificial hand leather cover (7) sample is placed in the cavity, and the back of hand mold shell (1) and the palm mold shell (2) are buckled together to form a complete sleeve shell; a gap with the same thickness and shape as the spacing mud layer (71) is formed between the cavity in the back of hand mold shell (1) and the palm mold shell (2) and the artificial hand leather cover (7), and silicone is injected into the gap, and the silicone solidifies to form a hand model sleeve (3), and the silicone at the rear end solidifies in the groove of the retaining groove (5) to form a mold sleeve retaining ring (31).

2. The method for making a parting line prosthetic mold according to claim 1, characterized in that: The mold for forming comprises: a back of hand mold shell (1), a palm mold shell (2), a hand mold sleeve (3), a port baffle (4) and a false hand inner mold (6); The back of hand mold (1) and the palm mold (2) are both molds of prostheses; the back of hand mold (1) and the palm mold (2) can be separated and assembled to form a sleeve shell of a complete prosthesis; the sleeve shell assembled by the back of hand mold (1) and the palm mold (2) is hollow inside, and the rear end of the sleeve shell assembled by the back of hand mold (1) and the palm mold (2) is open; The hand model sleeve (3) is a complete closed flexible sleeve, the rear end of the hand model sleeve (3) is open, the back of the hand model shell (1) and the palm of the hand model shell (2) can be detachably wrapped outside the hand model sleeve (3), and the hand model sleeve (3) is a mold of the outer contour of the prosthesis; an annular mold sleeve retaining ring (31) is arranged at the edge of the rear end opening of the hand model sleeve (3), and the plane where the mold sleeve retaining ring (31) is located is perpendicular to the plane where the rear end opening of the hand model sleeve (3) is located; The rear end openings of the back of hand mold shell (1) and the palm mold shell (2) are both recessed toward the front end to form a retaining groove (5); the retaining grooves (5) at the rear ends of the back of hand mold shell (1) and the palm mold shell (2) are spliced ​​into a complete annular groove, the mold sleeve retaining ring (31) can be detachably embedded in the retaining groove (5), and the outer side surface of the mold sleeve retaining ring (31) is flush with the outer end surface of the retaining groove (5), and the rear end opening of the hand mold sleeve (3) and the rear end opening of the sleeve shell composed of the back of hand mold shell (1) and the palm mold shell (2) are on the same plane; The artificial hand inner mold (6) is a closed hard model, the shape of the artificial hand inner mold (6) is the same as the shape of the artificial limb, and the artificial hand inner mold (6) can be detachably inserted into the inside of the hand mold sleeve (3); The port baffle (4) is a flat plate structure, and the port baffle (4) can be detachably covered on the rear end openings of the hand mold sleeve (3), the back of the hand mold shell (1) and the palm mold shell (2); an exhaust hole (41) and a glue injection hole (42) are also provided on the port baffle (4); the exhaust hole (41) and the glue injection hole (42) penetrate two sides of the port baffle (4); The rear ends of the back of hand mold shell (1), the palm of hand mold shell (2) and the hand mold sleeve (3) are sealed and locked with the port baffle (4) by means of bolts.

3. The method for making a parting line prosthetic mold according to claim 2, characterized in that: The artificial hand leather cover (7) is formed into a reserved retaining groove (5), a pre-embedded nut (51) and a positioning groove (52) by inverting a clay model on the palm side, and a plurality of matching blocks (11) and a plurality of locking holes (12) are provided on the clay model on the palm side. Then, a covering resin is applied to the back of the palm side of the clay model, and a glass fiber cloth is covered in the middle of the resin layer as a reinforcement layer, so that the resin is solidified and formed on the back of the palm side of the clay model. Then, the palm side of the clay model is removed to form an independent back of the palm mold shell (1) overall structure.

4. The method for making a parting line prosthetic mold according to claim 2, characterized in that: The rear end of the artificial hand leather cover (7) is open, and the thickness of the artificial hand leather cover (7) is 2.5 mm; The thickness of the injection-molded hand mold sleeve (3) is also 10 mm; the thickness of the spacing mud layer (71) is 10 mm.

5. The method for making a parting line prosthetic mold according to claim 2, characterized in that: The joint surfaces of the back of hand mold shell (1) and the palm mold shell (2) are flat and fitted, and the outer sides of the back of hand mold shell (1) and the palm mold shell (2) are convex outward; the inner side surface of the back of hand mold shell (1) is a back of hand mold groove (13) that is concave outward; the inner side surface of the palm mold shell (2) is a palm mold groove (23) that is concave toward the palm side; the back of hand mold groove (13) and the palm mold groove (23) are covered to form a sealed cavity with a rear end opening; The back of hand mold groove (13) and the palm of hand mold groove (23) are tightly fitted on the outside of the hand mold sleeve (3); The back of hand mold shell (1) is provided with a plurality of matching clamping blocks (11) and a plurality of locking holes (12); A plurality of the pairing clamping blocks (11) and a plurality of locking holes (12) are arranged around the edge of the back hand mold groove (13), and the pairing clamping blocks (11) and the locking holes (12) do not contact the back hand mold groove (13); The palm mold shell (2) is provided with a plurality of positioning slots (21) and a plurality of positioning nuts (22); Each of the positioning nuts (22) is embedded in the joint surface of the palm shell (2), and the positioning nuts (22) are located inside the joint surface of the palm shell (2); A plurality of positioning slots (21) and a plurality of positioning nuts (22) are arranged around the periphery of the palm mold groove (23), and each positioning slot (21) and each positioning nut (22) are aligned with the palm mold groove (23); Each of the positioning nuts (22) on the assembled back of hand mold (1) and the palm of hand mold (2) corresponds to a locking hole (12) in one-to-one position.

6. The method for making a parting line prosthetic mold according to claim 2, characterized in that: The hand model sleeve (3) is an integral sleeve structure formed of silicone, and positioning blocks (32) are also provided on the left and right sides of the outer wall of the hand model sleeve (3); Positioning grooves (52) are also provided on the joint surfaces of the back of hand mold shell (1) and the palm of hand mold shell (2); The positioning groove (52) is recessed downward and is formed on the joint surface of the back of hand mold (1) and the palm mold (2); the corresponding positions of the positioning grooves (52) on the back of hand mold (1) and the palm mold (2) are joined to form a square cavity; the positioning block (32) can be detachably embedded in the cavity formed by the positioning grooves (52); The clearance between the positioning block (32) and the positioning groove (52) is matched, and the clearance does not exceed 1 mm.

7. The method for making a parting line prosthetic mold according to claim 5, characterized in that: The artificial hand inner mold (6) is a solid hand model made of resin; The rear end of the artificial hand inner mold (6) is a plane, and a plurality of artificial hand nuts (61) are embedded in the rear end of the artificial hand inner mold (6).

8. The method for making a parting line prosthetic mold according to claim 6, characterized in that: The port baffle (4) is a transparent PVC flat plate, and the rear end surfaces of the back of hand mold shell (1) and the palm mold shell (2) are within the coverage of the port baffle (4); The port baffle (4) is also provided with a plurality of positioning holes (42), the plurality of positioning holes (42) being evenly distributed in two annular circles on the port baffle (4), the positioning holes (42) in the inner circle corresponding to the positions of the plurality of artificial hand nuts (61) one by one; A plurality of pre-embedded nuts (51) are embedded at the rear ends of the back of hand mold shell (1) and the palm of hand mold shell (2); The positioning holes (42) of the outer ring correspond one-to-one to the positions of the embedded nuts (51) provided at the rear ends of the back of hand mold shell (1) and the palm of hand mold shell (2).

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